Peroxidase Lab Report Essay Example

Peroxidase Lab Report Paper We were able to measure enzymatic activity by the change in absorbency per second with a spectrophotometer. By testing different concentrations of peroxides and its reaction rate in seconds, we were able to see that as the amount of enzyme increased the catalytic reaction also increased. The optimal amount of peroxides concentration to be used in the subsequent experiments was determined to be 1. 0 ml. Any amount above this would have caused the rate of absorbency to be too fast, making it too difficult to get accurate readings. Any amount below this would not have produced a reaction at an appreciable rate. (Dolphin, Fleck, Collect and Wastage, p. 76) In addition, our results show that a rise temperature and pH only increase the rate of reaction to a certain point before the reaction rate begins to decline dramatically. In the case of boiling of the enzyme there was no rate of reaction found whatsoever. A similar result was found when hydroxylation was added to the peroxides and it caused an inhibition reaction. Overall, the results show that the peroxides enzyme is sensitive with reference to the above factors in whether or not a reaction is catcalled. INTRODUCTION Enzymes are essential in the breakdown of certain materials or molecules that cannot be used by or are harmful to an organism as they are, into products that can be used or are not harmful for the organism. They are proteins and their structure consists of amino acids with a specific shape. Enzymes have an area called an active site where substrates (only a particular molecule or material to be converted) bind. We will write a custom essay sample on Peroxidase Lab Report specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Peroxidase Lab Report specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Peroxidase Lab Report specifically for you FOR ONLY $16.38 $13.9/page Hire Writer When the substrate is bound to the active site on the whole entity becomes an enzyme-substrate complex. The substrates covalent bond is disrupted and this chemical change constructs a new product from the original abstract while leaving the enzyme unaffected. Once this new product is released, the enzyme can bind again with more of these molecules needing conversion. Sometimes the enzyme works with commences or cofactors such as vitamins or metallic ions to help the binding process. In other cases competitive inhibitors are at work and prevent a substrate from being bound to the active site on the enzyme. The competitive inhibitor is similar enough to bind with the enzyme, but because it is not a perfect match, the enzyme then loses its ability to catalyst a reaction for that moment. In accordance with these properties, we ill see how certain factors affect the reaction rate of peroxides. For our purposes in this lab we used the enzyme peroxides extracted from a turnip. Peroxides, along with the help of its iron ion cofactor, catalysts harmful hydrogen peroxide (H2O) into a harmless compound and water. In order to follow the rate of reaction for the breakdown of hydrogen peroxide, we used ecological, a colorless dye, which donates electrons and turns brown when it is oxidized. We used this dye so that we could measure the absorbency with the spectrophotometer as the hydrogen peroxide is being broken down and the lour change gets stronger over specific time intervals. We developed several null hypotheses for these experiments: 1) The amount of enzyme added to the reaction will not affect the rate of reaction. 2) Temperature will not affect the enzymatic activity. 3) pH will not affect enzymatic activity. 4) Similar molecule to substrate will not affect enzymatic activity. MATERIALS AND METHODS Materials and methods are taken from Lab Topic 7 in the Biological Investigations, 9th Edition. RESULTS Graph 1- Effects of Peroxides Amounts Graph 2 Temperature Effects on Peroxides Activity Graph 3 pH Effects on Peroxides Activity Graph 4 Boiled Peroxides Results Graph 5 Hydroxylation Results Graph 6 Optimum Temperature for Reaction Rate of Peroxides Graph 7 Optimum pH for Reaction Rate of Peroxides In Graph 1, Effects of Peroxides Amounts, it shows the difference in rates of reactions with different concentrations of peroxides in the solution Tubes 2 3 at 0. 5 ml, Tubes at 1. 0 ml and Tubes 6 7 at 2. 0 ml, along with corresponding line slopes. Graph 2, Temperature Effects on Peroxides Activity, shows the difference in rates of reaction for 1. Ml peroxides at ICC, Room Temperature ICC, ICC and ICC along with their corresponding line slopes. For Graph 3, pH Effects on Peroxides Activity, it shows the rates of reaction at pH 3, pH 5, pH 7 and pH 9, along with its corresponding line slopes at 1. 0 ml peroxides. Graph 4, Boiled Peroxides Results, shows the rates of reaction for 1. 0 ml between a Normal Extract of peroxides and a Boiled Extract of peroxides, both with their corresponding line slopes. In Graph 5, Hydroxylation Results, it shows rates of reaction for 1. Ml between a Normal Extract of peroxides without hydroxylation and a Hydroxylation-treated Extract of peroxides. Graph 6, Optimum Temperature for Reaction Rate of Peroxides, shows the slope of the line at each temperature. Lastly, Graph 7, Optimum pH for Reaction Rate of Peroxides, shows the slope of the line at each level of PH. DISCUSSION The significance of the observations in testing the enzyme peroxides and its rate of breaking down hydrogen peroxide helped us to make a decision as to whether to accept or reject our hypotheses in the experiment. The amount of peroxides concentration had a direct relationship to how slowly or how quickly a reaction took place. This result allowed us to reject our hypothesis that the mount of enzyme added to the reaction will not affect the rate of reaction. This test was important so that we could ascertain the best amount of concentration to use in the subsequent experiments with the spectrophotometer set at absorbency 470 NM and timed recordings at 20-second intervals for a total of 2 minutes. At 0. 5 ml of peroxides the reaction time was too slow thus no appreciable line or slope was rendered to measure the reaction with any accuracy. Conversely, it was a challenge to get accurate absorbency readings at 2. 0 ml of peroxides because the pace of the reaction appreciated so quickly and hen met equilibrium. At 1. 0 ml of peroxides the reaction time rendered an appreciable line and slope making it easier to record the absorbency every 20 seconds for 2 minutes and ultimately, the best concentration for use in the next experiments. It is known that when heat is applied to molecules, they move faster and collide more as the temperature rises. This is also true for the enzyme peroxides and its substrate until the temperature reaches ICC and then the reaction begins to taper off and it dives down drastically at ICC when the hydrogen bonds holding peroxides structure together begin to break. The results of this test confirm the same by the slope of each line and thereby we are able to reject our hypothesis that temperature has no effect on peroxides rate of reaction. At ICC the slope of the line is 0. 0071, at Room Temperature ? ICC the slope is 0. 0094, at ICC the slope is 0. 091 and at ICC it is 0. 0052. This is easily seen on the derivative Graph 6: Optimum Temperature for Reaction Rate of Peroxides attached. It should be mentioned here that in class it was decided from the table of results on the board for this experiment that ICC was the optimal temperature. In addition, it is difficult to fully see the results from the line graph number 2. As we can see here from the derivative graph, that just numbers without the prop er graphs can be misleading and it is necessary to take further steps in clarifying the observations and results. As for pH effects on peroxides activity, Graph 3, indicates that the amount of acidity or bassinets to a solution changes the three-dimensional structure of the enzyme and thereby changes the ability to bind with the substrate in an effective manner. Here we tested the null hypothesis: pH will not affect enzymatic activity. The results from Graph 3: pH Effects on Peroxides Activity indicate that the more acidic pH 3 level disrupted the enzymes ability to bind with its substrate and its reaction rate did not appreciate noticeably. As the solution became less acid at pH 5, the greatest reaction efficiency resulted. Once the pH was at 7 and beyond the reaction rate for peroxides and its binding ability became poor and the reaction rate declined. Again, it was necessary to do a derivative graph to see the slope results clearly. In Graph 7: Optimum pH for Reaction Rate of Peroxides, the rate of reaction increased drastically from pH 3 with a slope f 0. 00007 to pH 5 with a slope of 0. 0055 and then trails off as the bassinets increases at pH 7 with a slope of 0. 047 and plummets as it reaches pH 9 with a slope of 0. 0022. We can see the optimal pH is 5 in this experiment and we were able to refute our null hypothesis because it was shown that pH does affect peroxides reaction rates. In boiling the peroxides extract, the result was that no reaction activity was found. As mentioned in our book by Dolphin, Fleck, Collect and Wastage, the enzyme is denatured because the high temperature broke a large number of hydroge n bonds, which dramatically changed the structure of the enzyme permanently (82). A denatured enzyme cannot catalyst a reaction and this result appears evident on Graph 4: Boiled Peroxides Results. The comparison between a normal extract of peroxides and a boiled extract of peroxides shows that zero absorbency with no appreciation was yielded over the two minutes for the boiled extract as opposed to the normal extract that did yield an appreciable line with a slope of 0. 0099. Again, we can refute our null hypothesis of temperature will not affect the enzymatic activity. Finally, a null hypothesis that a similar molecule to substrate will not affect enzymatic activity was tested.

Free Essays on Edgar Allen Poe, Life and Anylisis of His Work

Many authors have made great contributions to the world of literature. Mark Twain introduced Americans to life on the Mississippi. Thomas Hardy wrote on his pessimistic views of the Victorian Age. Another author that influenced literature is Edgar Allan Poe. Poe is known as the father of the American short story and father of the detective story. To understand the literary contributions of Edgar Allan Poe, one must look at his early life, his literary life, and a summary of two of his famous works. "Edgar Allan Poe was born in Boston'' (Inglis 505) "on January 19, 1809'' (Asselineau 409). He was born to a southern family that were in a traveling company of actors (Inglis 505). His father, David Poe, was from a Baltimore family. He was an actor by profession and a heavy drinker. Soon after Edgar Allan Poe was born, he left his family. Poe's mother, Elizabeth Arnold Poe, was a widow at the age of eighteen. Two years after his birth, she died of tuberculosis (Asselineau 409). When his mother died, Poe was adopted by John Allan (Perry XI) at the urging of Mr. Allan's wife. In 1815, John Allan moved his family to England. While there, Poe was sent to private schools (Asselineau 410). In the spring of 1826, Poe entered the University of Virginia. There he studied Spanish, French, Italian, and Latin. He had an excellent scholastic record. He got into difficulties almost at once. Mr. Allan did not provide him with the money to pay for his fees and other necessities. Poe was confused and homesick. He learned to play cards and started drinking. Soon he was in debt in excess of two thousand dollars. Poe discovered that he could not depend upon Allan for financial support. His foster father refused to pay his debts, and Poe had to withdraw from the University (Asselineau 410). In May of 1827, Poe enlisted in the army as a common soldier. He did this under the name of Edgar A. Perry. He was stationed on Sullivan's Island in Charleston Ha... Free Essays on Edgar Allen Poe, Life and Anylisis of His Work Free Essays on Edgar Allen Poe, Life and Anylisis of His Work Many authors have made great contributions to the world of literature. Mark Twain introduced Americans to life on the Mississippi. Thomas Hardy wrote on his pessimistic views of the Victorian Age. Another author that influenced literature is Edgar Allan Poe. Poe is known as the father of the American short story and father of the detective story. To understand the literary contributions of Edgar Allan Poe, one must look at his early life, his literary life, and a summary of two of his famous works. "Edgar Allan Poe was born in Boston'' (Inglis 505) "on January 19, 1809'' (Asselineau 409). He was born to a southern family that were in a traveling company of actors (Inglis 505). His father, David Poe, was from a Baltimore family. He was an actor by profession and a heavy drinker. Soon after Edgar Allan Poe was born, he left his family. Poe's mother, Elizabeth Arnold Poe, was a widow at the age of eighteen. Two years after his birth, she died of tuberculosis (Asselineau 409). When his mother died, Poe was adopted by John Allan (Perry XI) at the urging of Mr. Allan's wife. In 1815, John Allan moved his family to England. While there, Poe was sent to private schools (Asselineau 410). In the spring of 1826, Poe entered the University of Virginia. There he studied Spanish, French, Italian, and Latin. He had an excellent scholastic record. He got into difficulties almost at once. Mr. Allan did not provide him with the money to pay for his fees and other necessities. Poe was confused and homesick. He learned to play cards and started drinking. Soon he was in debt in excess of two thousand dollars. Poe discovered that he could not depend upon Allan for financial support. His foster father refused to pay his debts, and Poe had to withdraw from the University (Asselineau 410). In May of 1827, Poe enlisted in the army as a common soldier. He did this under the name of Edgar A. Perry. He was stationed on Sullivan's Island in Charleston Ha...

Beloved Character Analysis

Is Beloved the ghostly reincarnation of Sethe’s murdered baby, a flesh and blood version of the spirit Paul D. drives from the house? Or is Beloved unquestionably a ghost? The uniformly accepted notion that Beloved is a ghost is interesting, given that evidence throughout the book suggests that she is a reincarnated being. As the reader recalls, Sethe killed her first daughter with the idea that doing so would free her daughter from slavery. As a result of Sethe’s â€Å"motherly† actions, Beloved, enslaves the rest of the family including Sethe’s daughter, Denver. The family becomes disconnected from and outcasted by the black community, as everyone fears approaching the residency â€Å"haunted† by the supernatural. As the novel progresses, the presence of an unknown girl at 124 intrudes, yet again, on the lifestyle of Denver and Sethe. This character, who is identified as Beloved is ambiguously portrayed and therefore her analysis is the topic of debate and discussion. The character that is recognized at the 124 residency is in fact the reincarnation of Sethe’s first daughter, Beloved. The idea of the reincarnated in this novel is well established. Although, to the reader the possibility of this seems unlikely, in the book there are several examples that point to this being true. For example, the reader witnesses Sethe overlook obvious signs showing that this girl actually could be the personification of her murdered baby daughter. Additionally, Beloved is approximately the same age that Sethe’s first born would have been if still alive, and more evidence lies in the fact that she shares the same name as the one engraved on the baby’s tombstone. It happens that these trails of evidence all occur in order in the same scene. One evening Denver, Sethe, and Beloved are all gathered around a fire, and Sethe comes to a realization about the aforementioned evidence about Beloved. â€Å"The click had clicked; things were where they ought to be or poised and ready to glide in,† (Morrison 207). Beloved hums a tune, one that Sethe immediately recognizes. The scene seems surreal as Sethe is taken aback by the occurrence. â€Å"I made that song up. I made it up and sang it to my children. Nobody knows that song but me and my children,† (Morrison 207). Additionally, Beloved’s demeanor is that of a typical two year old. Her thoughts and actions mimic those of a young child rather than a young adult. For example, Beloved deeply loves her mother, Sethe, and is attached to her just as a young child would be. Not only does Beloved share a passionate love for her mother, but feelings are mutual toward, Denver, her sister. Beloved is jealous of the relationship Denver and Sethe share. Once again, these all point to the childish characteristics Beloved possesses in her reincarnated form. In referring to Sethe Beloved states â€Å"I am Beloved and she is mine† (Morrison 248). â€Å"It was Beloved who made demands. Anything she wanted she got, and when Sethe ran out of things to give her, Beloved invented desire† (Morrison 240). â€Å"When once or twice when Sethe tried to assert herself, be the unquestioned mother whose word was law and who knew what was best – Beloved slammed things, wiped the table clean of plates, threw salt on the floor, and broke a windowpane† (Morrison 242). Taking all of these factors into account, many would find it hard to dispute against Beloved’s reincarnated state. There are many supporting details that point to Beloved’s true identity. Beloved’s portrayal is in fragments and the reader must pay close attention to give away details about this young woman identity. Unraveling the great mystery of this young woman lies within the text, but yet many different opinions of Beloved still exist. Beloved Character Analysis Is Beloved the ghostly reincarnation of Sethe’s murdered baby, a flesh and blood version of the spirit Paul D. drives from the house? Or is Beloved unquestionably a ghost? The uniformly accepted notion that Beloved is a ghost is interesting, given that evidence throughout the book suggests that she is a reincarnated being. As the reader recalls, Sethe killed her first daughter with the idea that doing so would free her daughter from slavery. As a result of Sethe’s â€Å"motherly† actions, Beloved, enslaves the rest of the family including Sethe’s daughter, Denver. The family becomes disconnected from and outcasted by the black community, as everyone fears approaching the residency â€Å"haunted† by the supernatural. As the novel progresses, the presence of an unknown girl at 124 intrudes, yet again, on the lifestyle of Denver and Sethe. This character, who is identified as Beloved is ambiguously portrayed and therefore her analysis is the topic of debate and discussion. The character that is recognized at the 124 residency is in fact the reincarnation of Sethe’s first daughter, Beloved. The idea of the reincarnated in this novel is well established. Although, to the reader the possibility of this seems unlikely, in the book there are several examples that point to this being true. For example, the reader witnesses Sethe overlook obvious signs showing that this girl actually could be the personification of her murdered baby daughter. Additionally, Beloved is approximately the same age that Sethe’s first born would have been if still alive, and more evidence lies in the fact that she shares the same name as the one engraved on the baby’s tombstone. It happens that these trails of evidence all occur in order in the same scene. One evening Denver, Sethe, and Beloved are all gathered around a fire, and Sethe comes to a realization about the aforementioned evidence about Beloved. â€Å"The click had clicked; things were where they ought to be or poised and ready to glide in,† (Morrison 207). Beloved hums a tune, one that Sethe immediately recognizes. The scene seems surreal as Sethe is taken aback by the occurrence. â€Å"I made that song up. I made it up and sang it to my children. Nobody knows that song but me and my children,† (Morrison 207). Additionally, Beloved’s demeanor is that of a typical two year old. Her thoughts and actions mimic those of a young child rather than a young adult. For example, Beloved deeply loves her mother, Sethe, and is attached to her just as a young child would be. Not only does Beloved share a passionate love for her mother, but feelings are mutual toward, Denver, her sister. Beloved is jealous of the relationship Denver and Sethe share. Once again, these all point to the childish characteristics Beloved possesses in her reincarnated form. In referring to Sethe Beloved states â€Å"I am Beloved and she is mine† (Morrison 248). â€Å"It was Beloved who made demands. Anything she wanted she got, and when Sethe ran out of things to give her, Beloved invented desire† (Morrison 240). â€Å"When once or twice when Sethe tried to assert herself, be the unquestioned mother whose word was law and who knew what was best – Beloved slammed things, wiped the table clean of plates, threw salt on the floor, and broke a windowpane† (Morrison 242). Taking all of these factors into account, many would find it hard to dispute against Beloved’s reincarnated state. There are many supporting details that point to Beloved’s true identity. Beloved’s portrayal is in fragments and the reader must pay close attention to give away details about this young woman identity. Unraveling the great mystery of this young woman lies within the text, but yet many different opinions of Beloved still exist.

Marketing Little Known destinations the island of Saaremaa, Estonia Essay

Marketing Little Known destinations the island of Saaremaa, Estonia - Essay Example One key question that needs to be addressed when thinking of the marketing efforts is whether to prioritize their marketing efforts at the established markets or look at newer markets such as distant European countries. As per the context established by the case, the tourism industry is changing very rapidly. The tourists are much more open to traveling to distant places to discover new and little known, but exotic destinations (Yong, 2006). Therefore, with regard to Saaremaa, the marketing efforts should be prioritized to build new markets. Europe is well known for exotic and small destinations and hence, the level of competition is high. Therefore, to attract customers from a new market, it is necessary to have a high focus on building the brand, ensuring sustainability as well as in targeting the right market segment. For example, Saaremaa is famous for its natural beauty, its rich history as well as the sweet-sour bread and beer. Hence, the brand Saaremaa for tourism should adequ ately encompass these different aspects. The initial marketing efforts can center on advertising Saaremaa to create awareness and the subsequent efforts can center on introducing specific theme related holidays such as an exotic theme that centers on the sweet-sour bread and beer in the food category or a historical theme holiday destination. Focusing on new markets will also make the destination popular among a wider set of customers who have various preferences of holidays and hence, it would open Saaremaa’s uniqueness to customers who prefer such destinations. However, it should be ensured that any steps of market expansion should not result in overcrowding. In addition, any word of mouth marketing may already work in the existing markets which will ensure that there is a steady flow of tourists from the already established markets. Therefore, prioritizing the new market will bring in customers from newer markets and at the same time, the customers from the existing market s will continue to visit because of the existing efforts and word of mouth (Holloway, 2004). 2. Should Saaremaa improve access by ferry or plan on the construction of a bridge to the mainland, as a means of expanding tourism? Or, conversely, should the island authorities aim to limit the appeal of the island in its existing isolation, by aiming to boost income from a smaller base of visitors to this island destination? One of the highlights of Saaremaa is how it is exotic and little known, but extremely beautiful and a perfect holiday get away. Therefore, on one hand it is important to build the tourism sector, it should be done in such a way that the pristine surroundings are not disturbed and the serenity of the place is not at risk because of overcrowding. Therefore, to sustain this exoticness and serenity, it is necessary to ensure that the place does not degrade in standard because of overcrowding. Overcrowding may mean more revenue because of increased crowd influx, but it als o can result in pollution, higher crime rates, more buildings and development (Doan, 2000). It can also mean that the natural beauty as well as tourist spots no longer provides peace and tranquility, thereby taking away the charm from the place. Hence, it is recommended that appeal of the island should be maintained by ensuring that there is some amount of isolation. In such cases, the challenge is how to improve the tourism industry without

People Management & Performance in Contemporary Organisations Essay

People Management & Performance in Contemporary Organisations - Essay Example From this study it is clear that an effective performance appraisal system should also be implemented that will rate the employees according to their performance. Thus, adopting all these measures, the company can reduce its high attrition rate of graduate trainees and continue the normal organisational activities with greater productivity.This report stresses that  Pearl and Mutual Benefit Insurance Company (PMIC) is a financial service based organisation wherein higher rate of attrition of the employees has been witnessed. This can be justified with reference to the data produced at the end of the year 2014 revealing that 60% of the recruited graduate trainees have left the company for varied purposes such as change in career settings by shifting from one sector to other. One of the reasons behind this disturbing fact can be deemed as the persistence of inefficiency in the procedure of recruiting and selecting the trainees. It will be vital to mention in this similar concern that the recruitment procedure of PMIC must be structured in a strategic manner in order to select the potential graduates who would deemed fit with the company’s sales and hard driving oriented culture.  In accordance with the provided data on the case study, it can be ascertained that several graduate trainees who have been expensively recruited as well as trained have not obtained high ratings for their respective performance during annual appraisalsa.

Bats Echolocation Essay Example for Free

Bats Echolocation Essay Echolocation is the art which is utilized by many animals in the detection of their pray and for navigational purposes. These animals are generally not equipped with eyes that are functionally advanced to the extent that makes them a good predator in their habitat. Common examples of such animals are Bats, dolphins, whales etc.   Such animals emit an ultrasonic signal into the environment and sense the signal that returns back after striking from the surroundings. This enables them to appreciate what waits ahead of them, its range, size etc. In short echolocation works exactly like modern day sonar in which the animal makes an estimate of the range of the pray by calculating the time interval between its own emission of the sound and the echoes that return back. Bats use echolocation signals that range in the frequency from   14kHz to 1000khz (Neuweiler 245) .These signals are thus well out of the range of human ear to hear which is capable to decipher audio signals falling between the frequency of 20 Hz -20,000 Hz .. Studies have indicated that bats have a very characteristic pattern of hunting by echolocation that can be divided into four phases namely search phase, approach phase, terminal buzz and the post buzz phase. All these phases differ in their band width and inter pulse duration. When a bat is in flying smoothly in search of it’s pray it is said to be in the search phase which is characterized by pulses which have a comparatively low pulse repetition rate, a higher pulse duration and inter-pulse interval . When the pray is detected the signal is changed to the approach phase in which the interval between the pulses decreases to about 33 ms. Just before the capture of the pray most of the echo locating bats emit a terminal buzz, which has further decreased inter-pulse interval. The terminal buzz phase can also be divided into a Buzz I and Buzz II phase. Irrespective of the fact that a prey capture attempt is successful or not the same pattern of phases is repeated again during the course a bat is flying in search of its pray. To tell more simply the usual signals in the search phase are well separated and have a lesser rate/sec as compared to the signals which are released when the bat has spotted and is just approaching its target.   The pattern of the phases are however different which would be discussed later in the same article. One may be wondering what makes these animals utilize such advanced mechanisms to hunt for their pray. The answer lies in the fact that bats are provided with a highly sensitive inner ear (The part of the ear that detects and transmits hearing impulses to higher centers in the nervous system). In the same way bats have a very advanced auditory cortex in order to interpret these signals (Grinnell 25). Numerous studies have been conducted on the echolocation pattern of the bats; below it the summaries of some selected studies which would enable the readers in a better understanding of the topic. Although it is an extremely vast topic yet every effort is made to provide the summaries of recent five researches 1) Effects of successful capture attempt versus unsuccessful capture attempt on post-buzz period: Adam et al in their study demonstrated the effect of a successful catch over an unsuccessful attempt on the post-Buzz period. Post Buzz period is the interval that follows the terminal buzz till the usual pattern of the pulses, search phase is restarted. According to this study the post-buzz phase was significantly greater after successful attempts as compared to unsuccessful attempts.206 ±112.3ms for successful attempts and 106.2 ± 83.3 ms for unsuccessful attempts. This increase in the post-buzz period has been attributed to time that is required in the handling of the pray. Similar studies have indicated increase in post-buzz time upon the successful capture of the pray (Kalko 225). However the post-buzz time was shorter in this study than that found in that found by Adam et al possibly due to the use of smaller insects. So the pray size is also a determining factor in the duration of post-buzz interval. Similar results were obtained by a study done by Annemarie, Vibeke and Jakob Tougaard from the University of Southern Denmark. In addition to the calculation of post-buzz time for successful and unsuccessful attempts they also calculated the post-buzz periods for touches also, i.e. when a bat is unsuccessful in capturing the prey yet its body parts slightly touch the prey in flight. Similar to the previous studies the post-buzz period was greatest in successful catches 272.2 ms and shortest in unsuccessful attempts, 117.9 ms and almost a middle value in case of touches i.e. 181.2 ms. 2. Effect of the size of prey on the bat’s response time One might think that it makes sense if we say that larger prays are detected from a longer distance as compared to prays of smaller size. But in actual studies this belief has been negated. One of the studies indicated that there was no significant effect of the size of the pray on the reaction time of bats. The mean time from detection till attempted capture was 604 ±141 ms (Britton 1796). Similar results were found by Acharya and Fenton in their study titled â€Å"Echolocation behavior of vespertilionid bats attacking airborne targets including arctiid moths† 3. Echolocation frequency of bat species and its relation with geographical habitat: In a lot number of studies the interesting phemenon of the relationship between specific bat frequencies to their habitat was demonstrated. Gareth Jones and Sofie M. V Parijs demonstrated the presence of both high frequency and low frequency Pipistrelus bats in Britain. The echolocation signals of the low frequency bats were never found to exceed 52 KHz while that of the high frequency bats were usually above 52 KHz (Jones 123). They attributed this frequency difference to their geographical habitats.   In recordings from Scotland the high frequency bats which were found to be 71% clearly dominated the low frequency bats.   Thus it was concluded that in a particular geographical area different phenotypic bats having nearly similar echolocation frequencies of the same specie can exist and the change in frequency is not exhibited by the same phenotype which change its frequency according to ecological conditions. 4) Echolocation studies in Dolphins: Dolphins appear to have a lot more advanced echolocation system as compared to bats. They listen to their pray and then use echolocation signals to get more information about the pray (Harley 62). There is also a possibility that dolphins use echolocation signals for communication purposes as well this was proposed by Brownlee. Conclusion: Keeping in view the diversified studies that have been done on the echolocation patterns of bats one finds himself amazed to see what is known and highly curious about what is yet to be found out. Future works can target coding bat species according to their echolocation frequencies. Although this is not going to be an easy job but it is going to open windows to new dimensions of research. Through this coding an attribution to the geographical location of the bats can also be made.

Gender Quota Policies Essay -- Law, Women Behavior in Hearing Debate

In general, every country has two choices when it comes to getting women involved in politics; they can either encourage women’s participation in politics or implement policies that require parties and parliament to have a certain proportion of women holding elected offices (Stokes, 2005: 78). The second option requires that the party adopts the gender quota system which is a number of seats reserved for women (Stokes, 2005:77). Ever since quotas have been adopted and diffused across nations, the proportion of women in national legislature has increased from the period of 1975 to 1995 (Caul; 2001:1214). This goes to show that the adoption of quota policies have facilitated women’s entrance into politics. However, the road to adoption of the quotas policies has been influenced by several factors: political and societal (Caul; 2001), as well as parties’ culture and characteristics (Stokes 2005, Chapter 1). The rationale behind using quota policies is that the more women are present in legislative politics, the more chances women will have the chance to influence policy (Lyn: 1994: 560). Lyn Kathlene examines women’s presence and behaviours in a Colorado state in legislature hearing committees to test for their input in policy making and debates. The question that this paper seeks to answer if whether or not women get to influence policy making once in office, like advocates hoped for? We will see that to a certain extent it is possible to observe women’s impact in the decision making process. Although other pressures such cultural, negative conversational dynamics between men and women are present it does not decrease the rate of women’s participation in political decision making process. Instead it exposes the negative response ... ... on issues that directly affect them such as family issues. Their presence in national legislature means that they were elected by the population, they not only acting on behalf of all women but also standing in these hearing committees as their duty as a delegate of those who have elected her. The grounds for their interventions are based on their ability to position themselves as women but also as an elected official. Being present at hearing debates, shows that their presence is aligned with their ability to influence policy, regardless of the times they get interrupted. Male’s behaviours towards women expose a reality that is more related to their characters and behaviours. The findings that we have looked do not show any connection male’s behaviours towards women in hearing debate that discourage them from participating and voicing their opinions in debates.

Teaching: a Noblest Profesion

For the last 50 years, educators have devoted a great deal of energy to the debate whether teaching can be considered as a profession. Unfortunately, this turns out to be a wrong question, and so led us to the wrong sort of answers. Teaching is really a noble profession. Every one of us, including our nation’s President is the product of teaching. The teacher is the one who molds a child into what he will be in the future. In this study, we will learn about the teachers, and the nature, history, the art, essentials, strategies, cycle and imperatives of teaching.Teacher Teacher is a person who provides education for pupils and students. The role of teacher is often formal and ongoing. Origin The word â€Å"teacher† is the noun form of the verb ‘teach’, the word ‘teach’ derives from the English word tà ¦can which means to show, point out or give instruction. In 1290, the word teacher began to be used for the index finger or one ‘that point s out’. By 1300, it took on its modern meaning, or ‘one who teaches’. Teach in old English first meant â€Å"to present or to point out, instruct† and the word is Germanic origin.The word teacher was first used to mean ‘that which points out’ and then quickly became used in the sense of â€Å"instructor†. Great Teachers A teacher shapes the personality of his student. They help child reach the highest possible degree of personal development. A good teacher not only shows the right path that the students should follow but also prepares the human resource for the further development of the nation. Most Famous Teacher Some of the most important men in history have been teachers. The most famous teacher in the western world was Jesus of Nazareth.His teaching had two aspects, both vitally important and closely connected. He taught his own pupils, the Jewish people, his pupils were with him all the time. They were all poor, ordinary men, simp le and good. He also taught the general public. He read out a piece of the scriptural books and then explains it to the others. But more often Jesus delivered short speeches in the open air, huge crowds gather to hear him, and simply hoping they would learn something. Nature of Teaching Teaching is regarded as the noblest of all professions in the world.It is an occupation that will not give you a promotion on very easily base on your performance. In its broadest sense, teaching is a process that facilitates learning. The choice of learning activities whereby the goals of education are realized in the school is the responsibility of the teaching profession. Teachers vary in their views of nature of teaching. Over the years many have debated on whether teaching is an art or a science or both. Others view teaching as a system. As an art, teaching calls for intuition, inspiration, talent and creativity.Teachers who adhere to this view look at students as individuals with different abil ities and backgrounds. These teachers believe that teaching requires an ability to see through and respond to individual differences among learners. As a science, teaching requires knowledge of scientific discoveries regarding the teaching- learning process, the objectives of education, subject matter and the nature of learners. Teacher who believes in this point of view consider knowledge and applications of techniques already tested to bring out learning as vital in their success as teachers.When viewed as both, teaching requires striking a balance between the application of proven instructional principles and the use of intuitive approach of an artist. Teaching as a system, requires an understanding of the role of the more mature, experienced members of society in stimulating, managing and guiding the immature. Teaching Teaching is all about inspiring, engaging, and empowering our children and young people. It is about making a difference to future generations. History In ancient India, China, Egypt and Judea, teaching was often performed by a priest or prophet, and the teacher enjoyed prestige and privilege.Among the Jews, many adults considered teachers the guide to salvation and urged children to honor their teachers even more than their parents. By the Middle Ages in Europe (5th century to 15th century), the Roman Catholic Church had taken over the responsibility for teaching, which was conducted in monasteries and specially designated learning centers. In North America a commitment to education played an important role in colonial development of the continent. They also valued the role of higher education.They considered education not only a means of harnessing talent in the nation, but also a means of teaching people the demands of democratic citizenship. The Art of Teaching Teaching has defined not simply as a process of imparting knowledge nor getting a message across but rather a process of communicating aimed at affecting desirable changes in the behavior of the learner. It holds the key to character of its people. Teaching is not an easy task. It’s an art form; one that requires craft, sensitivity, creativity, and intelligence. Essentials of Good Teaching There are different ways of good teaching.The primary characteristic of the teacher is to like children. A teacher must not only like the young because they are young. He must enjoy their company in groups. Meanwhile, it is enough to point out that there are many pupils than teachers in the world. Others include, proper training, patience, sense of humor, excellent attendance, hardworking, skill in lesson planning, interest in each child, patience and creating a positive learning atmosphere and developing a good rapport without showing favoritism. Hardest Jobs in Teaching The teachers play many roles.The roles they played include the following: controller, assessor, a resource, coach, tutor, organizer, facilitator, counselor, an instructor, a provider of experiences , model, motivator, authority, arbiter, examiner, disciplinarian, balancer, mentor, prompter, participant, performer, rapport builder, public relations, specialist and parents surrogate. There are many jobs in teaching, but one of the hardest jobs is to be a leader. As a leader she is first to act to show ready, willing and active participation, first to show how things should be done correctly, and first to take a principal role in any group undertakings.Above all, she is able to move the members, has full command and authority and can influence others to follow. Teacher leadership roles also vary in accordance with the professional development experience of the teacher. Teaching Strategies There are varieties of teaching that instructors can use to improve student learning. Listening At the four language skills, listening has been sadly neglected. Students listening comprehension usually lags behind. They lack the ability to comprehend the spoken language.Because language is basic ally oral, students should develop their listening and speaking skills side by side with their reading and writing skills. Speaking In language teaching, the teacher serves as a model to the students. Teacher should therefore, be able to produce the vowel and consonant sounds correctly for the student’s imitate. Before the students can actually communicate in sentences, they have to know the sound system of the language. Hence, from the kindergarten to the sixth grade, pronunciation lessons are a must.Students should know the proper stress of words, phrases and sentences and observe the proper stress of words, phrases, sentences, and observe the proper pauses when speaking to avoid misinterpretation of what they hear and to be understood by other. Reading Teaching strategies in reading are based on the philosophy and theories regarding the meaning, nature and structure of reading. They are also based on the important foundation disciplines such physiology, linguistics and soc iology. Reading is the process of making and getting meaning from printed word symbols.Efficient reading is an active dialogue between author and reader. The efficient reader is ready to evaluate, challenge and criticize reading materials. The man who read well is the man who leads. Writing Before one can teach properly, however, one must first have a clear idea of what good writing is and how it is produced. Based on the concept of writing as a thought process, the teacher of writing is concerned with developing in the learner ability to marsh all his ideas in such a way that he is able to select what are important and relevant to his purpose, at the same time to present them in a coherent and logical order.The pupil must learn to manipulate English patterns in order to produce texts that are grammatically acceptable, and they are required to learn how to organize sentences in a way that a definite communication purpose is served such as narrating, arguing, defining, explaining, de scribing, etc. Planning for Effective Learning and Teaching These days, many people can be a teacher, but the question is, are these people can be an effective teacher? Clearly, to be an effective teacher is more complicated and difficult than many people think.Effective teachers are distinguished by their dedication to the students and to the job of teaching, and feel responsible for the achievement and success of the students and own professional development. Effective teachers really believe that all students can learn, although all learn differently. Teachers will benefit when they learn how to plan for effective teaching and learning. Planning lessons for a whole school year can be challenging, but they can be successful if they start early and continue modifications throughout the year. Effective learning in school doesn’t happen by accident. Good lessons have to be planned for.It is important that a teacher understands clearly what he should do to bring about desirable learning in the students. This is his main role. He needs to plan his work. Planning for effective teaching is a lengthy process, but teaching the lesson, requires implementation and skill. Planning effective learning and teaching experiences are one of the skills the teacher has to develop. Planning insures more or less the direction that his efforts will take. Careful planning can give the teacher a sense of confidence in overcoming nervousness and preventing wastage and confusion especially during the first days of teaching.Teaching Imperatives In order to guarantee a continuing professional development of teachers these three distinct concerns must be applied: Knowledge Teachers must be sensitive, daring and ready to explore and widen the scope and coverage of the content they are teaching. They must not only be grounded in the basics of discipline, steep in recent trends, new understandings and logical predictions characteristics of professional growth, but more importantly we ll-versed in assimilating and sustaining valuable learning.Skills Teachers play a significant role in developing the same skills and creativity in using the technologies must appropriate for the kind and nature of learning desired. They will be the most effective to provide such assistance only if they have been sufficiently trained and prepared for it. Attitudes and Values Knowledge and skills will undoubtedly enhance and nurtured if some valuable personal and professional values are firmly developed.Teachers whose main responsibility is to mold the minds of the young should e imbued with such values as critical mindedness, creativity and innovativeness, strong motivation, to grow professionally and to adopt to the challenges of societal changes. In conclusion, teachers are the guiding light to students. Teachers are miracle workers when it comes to trying to get every student to pass a test. Teachers are also a knowledgeable worker, transporting much knowledge while shaping the mi nds of our youth and thus have a responsibility and image to uphold. In order to maintain structure of professionalism in the educational environment, education systems need to take steps to make sure they handle this task efficiently.

Report of Contract of Agency

Topic: Law of agency Summary of Facts: Company Star Boat employed Tom as the manager for marketing and sales department. Being an agent for Star Boat, Tom frequently concluded contracts with a number of suppliers for acquiring certain parts to manufacture boats. Smooth Sailing was one of the suppliers. Tom resigned from Star Boat in July 2012 upon being offered a better position in Star Ferry. However, he acquired 4,000 parts from Smooth Sailing in August and manager of Smooth Sailing did not notice that in the contract Tom indicated his signature as â€Å"manager, Star Ferry† and thought they were dealing with Star Boat as usual.When Smooth Sailing later notified Star Boat to make payment, Star Boat wanted to ratify the contract. Legal Issues: First, Star Boat wants to ratify the contract, we must know that whether there is any valid contract formed. There are six elements to create a valid contract including intention to create legal relation, an offer and acceptance, consid eration, privity of contract, capacity of contract and legality of contract. The first element – intention to create legal relation is not fulfilled. As Smooth Sailing intended to deal with Star Boat but not Star Ferry.However, the contract now is dealing with Star Ferry. Smooth Sailing has no intention to deal with Star Ferry. As there is no intention, no valid contract is formed. Second, there is a unilateral mistake in this contract. Unilateral mistake involves only one party mistaken. To be operative, it must be known to the other party. Normally involve fraud on the part of the non-mistaken party. In the above case, Tom was dealing with Smooth Sailing before July. However, in August, Tom did not tell the truth to Smooth Sailing that he is the agent of Star Ferry but not Star Boat now.Therefore, Smooth Sailing thought that he was dealing with Star Boat as usual. In the following paragraph, we list two relevant cases which are similar to the present case. Cundy v. Lindsay (1876) HL, L & Co, a linen manufacturer, received an order for a large number of linen handkerchiefs from Blenkarn, who signed his name in such a way that it looked like ‘Blenkiron & Co’, a well-known respectable firm. L & Co dispatched the goods on credit to Blenkarn, who resold 250 dozen to Cundy. Blenkarn did not pay for the goods. L & Co sued Cundy to recover the handkerchiefs.It was held that the contract between L & Co and Blenkarn was void for unilateral mistake. L & Co intended to deal with Blenkiron & Co, not Blenkarn. Cundy was liable to return the handkerchiefs to L & Co because no right of ownership had passed to him. Lewis v. Avery (1971) Lewis sold his car to a man who claimed to be Richard Greene, a popular star. The man paid by cheque, providing a film studio pass as a proof of his identity. He sold the car to Avery. The cheque had been taken from a stolen cheque book and was later dishonoured. Lewis sued Avery to recover his car.It was held that this co ntract cannot be voided as the plaintiff cannot show the importance of identity. The mistaken belief to the credibility of act is not sufficient. Comparison: Comparing the legal issue between Cundy v. Lindsay (1876) and our case, both cases have the unilateral mistake. Cundy v. Lindsay can be voided because the identity was vital for them to form a contract. For the second case Lewis v. Avery (1971) compare with our case, both are also have the unilateral mistake. But the case Lewis v. Avery cannot be voided as it cannot show the importance of the identity.In our case, Smooth Sailing was dealing with Star Boat in the past and it shows that the identity is very important. Conclusion: In our case, Smooth Sailing thought it was dealing with Star Boat as usual and the identity is very important as it affects the credibility. In fact, Smooth Sailing always deals with Star Boats. We apply the case law, the contract should be voided because Smooth Sailing mistakes the identity and the iden tity is vital to the contract. Moreover, Smooth Sailing has no intention to deal with Star Ferry. Therefore, no valid contract exists and Star Boat cannot ratify the contract.

Musical Genre of the Decade essays

Musical Genre of the Decade essays I would just like to comment on a poll I recently saw on CNN SHOWBIZ tonight. The question asked Which musical genre was the dominate genre of the decade? I believe that there were three prominent music genres of the 90's. Alternative Rock became a way to release anger. Hip Hop music came into its own and took the world by storm. Techno or 'rave' music provided a way 'out' from the teenage hardships. These three genres truly defined the 90' music scene. Alternative Rock was a rebellion of 80's pop rock. It was hard and truthful, something 80's pop rock wasn't. It emerged in the early 90's producing such bands like Pearl Jam, Soundgarden and Nirvana. It gave a healthy release of aggression of the days teens. This gave way to such heavier acts like Korn, which in turn tried to stamp out pop music. In the past Rock bands have lived on in the memories of others, and so will the world of Alternative Rock. I mean when was the last time you saw the name of a disco star on a T-shirt? Hip Hop emerged a new form of music in the 90's. It was the child of 80's rap music. Hip Hop became a way for young urban Black artists to express their musical talent. The fame, fortune and sex appeal of most Hip Hop was enough to lure most people to its deafening beats. Some grand masters, like Puff Daddy and Dr. Dre, have even acquired their own record labels respectfully. Hip Hop music lends its ear to young urban youths; this has branched off to suburban youths as well. Hip Hop has not gained its full momentum, but it will speed past it in the years to come. Techno music or 'rave' music has a special place in the music of the 90's. Techno and rave go together like rock and concerts or hip hop and jams. Raves are places were dancers, DJs and dopers come together to experience the essence of techno music. But young people have also attacked raves for the use of hard drugs. But techno isn't all about drugs. Such prominent techno or ...

Network and Protocol Processes Essay Example | Topics and Well Written Essays - 2000 words - 3

Network and Protocol Processes - Essay Example The DNS server is part of the network configuration of my host. The DNS server returns the IP address 212.183.133.187 (Byrnes, 2000). Now my laptop has enough information needed i.e. IP address 212.183.133.187and the HTTP webserver port 80; it can establish a TCP connection to the X-Stream webserver.The DNS server is part of the network configuration of my host. The DNS server returns the IP address 212.183.133.187 (Byrnes, 2000). Now my laptop has enough information needed i.e. IP address 212.183.133.187and the HTTP webserver port 80; it can establish a TCP connection to the X-Stream webserver.2. Requesting a TCP connection by X-Stream webserver to port 80 at IP address 212.183.133.187 (Transport Layer)The data received from the HTTP request (From Application Layer) is divided into several packets. These data packets include:a) My laptop’s IP address which has been delivered by my DNS server and determined as 212.183.133.187b) Port number: the default port number of the HTTP request is 80 and can be 443 if I make secure connection https://x-stream.leedsmet.ac.uk or if the X-Stream network requires a secure connection at the time I am making a request.  c) Acknowledgement number: This specifies the next sequence of figures that are expected by my laptop which sends the segment. TCP shows that this field is active by setting the acknowledgement number bit that is usually set after the establishment of the connection.d) Reserved bits: This are reserved for future use and are therefore sent to zeroe) Data offset: These are four bits that specify the number of the 32 bit word which defines the TCP header.f) Checksum (16 bits): Checksum is used for error control that covers the data fields and header. It also covers a pseudo-header; and includes destination and source addresses, the segment length and the protocol. This information is then forwarded together with the segment in order to IP to protect TCP from faulty routing of segments. The segment lengthâ €™s value includes the TCP header and data (Comer, 1999).g) Control bits.  My laptop (TCP Client) requests the Internet protocol to deliver an IP datagram with connection request to destination 212.183.133.187.

Globalisation High School Essay Example | Topics and Well Written Essays - 2500 words

Globalisation High School - Essay Example These two books are Thomas Friedman's The World is Flat, and Tarek Barkawi's Globalisation and War. As pertains to the concept of the state within the era of globalisation, neither of the authors engages in the explicit discussion of this question. Their position on the question, however, is implied throughout each of their works and, a close reading indicates that they adopt diverse positions. Friedman, a globalisation proponent and optimist, believes that globalisation has minimalised the role of the state in both the economic and, interestingly enough, political spheres. Globalisation, as he argues, implies the triumph of rational economic considerations over, often emotional and ideologically-based, political ones. The state, in other words, has not simply been eliminated as a market-player but, to a great extent, it no longer has the requisite power or capacity to impose its will over the market nor, indeed, to stand in the face of globalisation. To protect their status and maintain their control and authority over their territories, states customarily imposed artificial barriers to the movement of people, goods and services, let alone information, across borders. With these barriers in place, the world was a vast space, comprised of politically and economically sovereign nation-states wherein states primarily governed on the basis of political ideology. Not only that, but as major market players/shapers, states based economic and market decisions on ideological considerations. Globalisation did not, according to Friedman, simply flatten the world, as in make it infinitely smaller (9-10) but it effectively minimalised the role of the state. Trade networks, inextricably connected nation-states together, concomitant with the emergence and proliferation of the information highway, implying the interconnection of cultures and diverse peoples, rendered states incapable of controlling economic activities within and across their borders any more (Friedman, pp. 8, 45, 74, 102-103). Globalisation, in other words, rendered politics/state, an instrument of economics/trade/market, as opposed to the traditional and historic voice-versa. The state, from Friedman's perspective, has been flattened by the force of globalisation and, positively so. By claiming that globalisation has flattened the state, along with the world, Friedman does not mean that the state has been rendered ineffective. The state still has a role to play within the context of globalisation, although that role may be very different from its earlier one. Rather than an overtly political role which renders economic considerations subservient to ideological ones, the state now plays the role of coordinator, or protector of national economic interests. It does so, as may be inferred from the entirety of Friedman's treatise, not because it has been bought out by big business' but, because globalisation has rendered the national interest an undeniably, and overtly, economic one. In order to protect its national interests, as it is expected and required to do, the state need protect its economic interests and the