Daphnia Heart Rate – Lab Report

Caffeine is a stimulant which is derived from leaves, flowers and seeds of plants. The plant uses the caffeine as a way to repel insects as it is used as a natural pesticide by paralyzing and killing certain insects. It is used as a stimulant to human the central nervous system by increasing the stimulatory of the neurotransmitters, however high levels of caffeine to the body can cause effects of insomnia, stress, anxiety, weight loos or high blood pressure. In this investigation the effect of caffeine was observed on Daphnia [figure 1] a water crustacean, commonly known as a water flea, normally found in a aquatic areas like ponds, lakes, streams or rivers. They were used because this species of water fleas has a transparent exterior and it is easier to observe the heart rate of the Daphnia through the microscope.VariablesIndependent variables:Same volume different concentration of caffeine. Dependant variables:Heart rate of Daphnia.Controlled variables.Time.Temperature.Size of Daph nia.MethodEquipmentCavity slide.Small piece of cotton wool.Pasteur pipette.Caffeine at different concentrations.Microscope.Tally counter.A piece of wool is teased and made into a small loop.The woollen loop is placed onto a cavity slide.A Daphnia is picked out from a beaker containing the Daphnia with a pipette and then placed in to the loop on the cavity slide The Daphnia used have been left to refrigerate so that the heart rate has been lowered. Immediately after placing the Daphnia onto the slide add pond water was added or the first concentration of the caffeine but adding the same volume each time just different concentration. The Daphnia was placed onto the microscope with a low lighting. Using the tally counter the heartbeat of the Daphnia is counted for 30 seconds. When finished the Daphnia was placed into a new beaker of water. When repeating a test a different Daphnia is used.PredictionThe concentration of the caffeine in the blood of Daphnia will determine the heart rate of the Daphnia. It will be directly proportional to each other, meaning that the increase of the concentration of the caffeine will give an increase of the heartbeat. This prediction can be justified with the fact that caffeine is a stimulant drug that affects the central nervous system, speeding up your metabolism and increasing alertnessResultsCaffeine Heart Rate (BPM)Test 1         Test 2        Test 3         Test           Average 0                     196              190              194           194 0.1                 120              172              140           144 0.2                 120              172              140           144 0.3                 272              316              278           288.6 0.5                 300              306              306           300Ethical issuesAlthough there are no laws of protection of Daphnia, they are still living organisms that need to be treated with reverence, keeping them exposed to environments that they are not naturally acquainted with would deem unethical, so putting them back into pond water when finished would be proper. It could be argued by animal rights or religious views that experimenting on any kind of living is wrong as they also probably feel pain, although they may not suffer in the same way as higher animals they should be correctly returned to their natural habitat after observation.Risk assessmentPreventionCaffeine Concentrations in eyes or spillages onto clothes. Caffeine concentrations could splash into the eyes causing irritation, this could be prevented by wearing goggles. Also to prevent close being damaged by spillages a lab coat should be worn.MicroscopesHeat from the microscope can be harmful to the Daphnia, keeping the brightness low wonâ₠¬â„¢t kill any Daphnia. Glass ware breaking. Handling any glassware for example beakers or petri dishes with care. Wearing goggles or a lab coat will help towards preventing any accidents.Source of errorBecause we had to count the heart beat ourselves it is unreliable as we weren’t able to click fast enough or clicked one to many when there wasn’t a heartbeat or miss heartbeats all together. -Each time a different concentration of caffeine was added a different volume of distilled water was also added each time. As well as different volumes of caffeine. -A different Daphnia was picked out every time a new test was carried out, so they may have been different age/size/gender, this can cause different results. -The timing method was not precise each time a test was carried out as the 30 seconds was either just under or just over. -Because of handling the Daphnia from the beaker to the petri dish to a light under the microscope could put the Daphnia under pressure giving them a raised heart beat any way.ConclusionOur results show a curve of 0% concentration being higher than 0.1% and 0.2% concentration, this could be because of a source of error, as the graph shows a positive correlation of the increase of the caffeine percentage of concentration to the heartbeat of the Daphnia. The results did not fully match with the prediction made as the caffeine concentration % at 0.2 was less effective than 0.1, this may have been a human error, but other than that it seemed to support the prediction as the heart rate tends to increase from 0.2 onwards as there is a considerable increase from 0.2 to 0.3. Withthe sources of error affecting the results making them inaccurate, we could improve the reliability of the test by improving the count of the heartbeat of the Daphnia or using bigger animals so that the heart is easier and quicker to find. Doing trial runs or repeating the test more times could help towards the reliability of the test.ReferencesEn.wikipedi a.org. 2013. Caffeine. [online] Available at: http://en.wikipedia.org/wiki/Caffeine [Accessed: 15 Oct 2013].En.wikipedia.org. 2013. Daphnia. [online] Available at: http://en.wikipedia.org/wiki/Daphnia [Accessed: 15 Oct 2013].

Journal Entry Week One

The culture goes back through time. Assayer (2013) stated, â€Å"Egypt continuous cultural tradition?lasting over 3,000 years? Is history's clearest example of how peace and prosperity go hand in hand with cultural stability† (p. 28). There are many fascinating facets from the way Egyptians lived from the building of the pyramids to the burial of their leaders.It amazes me to know a society can build such structures without the modern day machinery that we have today. The passion they had for life and displaying that In the way they lived as written on the walls of heir pyramids. One of the Inaccuracies of these Images Is they are exactly the same. All the figures have the same body structure and build. Male and female resemble each other In such a way that the only way to tell them apart Is by their facial hair.All of the Images are depicted facing to the right or left and having the same size. This Is still a mystery as to why their depiction of their people Is of this natur e. The Egyptians went through droughts with the water system and developed and depended on an irrigation system that provided their society with water. This is just en of the many important aspects of the Egyptians that help to make them unique. The Egyptians also found uses for metals and were able to manipulate these metals into jewelry and amour.Their leaders were buried in tombs and the organs separated into jars made out of precious metals and Jewels. The heart was weighed as a part off balance system during the burial. The sun was an important part of their lives and even treated as a god. All these different aspects of the Egyptian culture made up who they were as a society thousands of years ago.

The Competitive Advantages of Apple Inc Literature review

The Competitive Advantages of Apple Inc - Literature review Example John Wiley & Sons. 15 Bibliography 17 Literature Review Interrelationship between Leadership and Organizational Commitment In the year 1993, Drucker had mentioned that the performance and quality of the managers are significant influential factor to decide organizational success. A company without effective leadership would not be able to transform the internal resources to its competitive advantage. It would not be denied that there is a close relationship among the leadership style and organization development. In the year 1990, Bass made one study in which it was pretty observable that around 45 % to 65 % of the total factors which are responsible of causing either success or failure would be decided by the organizational leaders. Definition of Leadership Leadership is an ability to persuade any group towards the attainment of goals. In the year 1964, Tannenbaum and others have considered leadership as an influential factor in human relations. Leadership is an attribute guiding a group of people to achieve preset goals through communication. According to Fiedler, leadership can be assumed to be a type of relationship to make the group members work together and achieve common goal. Rauch and Behling in 1984 and Hsieh in the year 1993 considered leadership as a process to influence any group to approach the goals. Theories of Leadership Since twentieth century, a number of theories and literature had been introduced to prove different standpoints. Four major perspectives had been shown through these theories. Some of the theories are articulated in the later segment (Wu et. al., 2006, p.438- 440). Trait Theories According to Stogdill (1963) and Davis (1972), a successful leader must posses certain personality traits. Behavior Theories In 1957, Halpin and Winer had introduced two dimensions, initiating consideration and structure. Following the same, a number of studies conducted by Stogdill, Likert and Kotter also introduced certain behavioral attributes of le adership. Contingency Theories In the year 1967, Fiedler has introduced the contingency model of leadership. In the year 1971, House came up with a path-goal theory by extracting details from the research carried out by Ohio State University as well as the expectancy theory of motivation. In the year 1977, Blackchard and Hersey introduced situational leadership theory considering two leadership sides in terms of relationship behaviors and tasks and mix and matching the intensity of these two to come up with specific leadership types: selling, telling, delegating and participating. As per Contingency theory, the leaders of any group are required to opt for an appropriate leadership style considering the readiness of the following group. The selling style can be effective for willing but unable subordinates; while, the telling styles can reap good results for the unwilling and unable followers. Leaders usually use participating style when his or her followers are willing but unable. T he delegating style seems to be good for followers who are able but unwilling to do the tasks (Wu et. al., 2006, p.438- 440). Non Charismatic Theories: These theories include the theories on transformational and transactional leadership styles. These two are pretty well known in the arenas of leadership theories. According to the transactional leadership theory, both superior as well as the subordinate would influence each other to derive value of that exchange. Transactional leader

The Strange Case of Dr. Jekyll and Mr. Hyde written by Robert Louis Essay

The Strange Case of Dr. Jekyll and Mr. Hyde written by Robert Louis Stevenson - Essay Example Jekyll’s counter part, Mr. Hyde, a very important character in the story is rather like a synonym for iniquitous personality. A quote from page 40 reads like this, â€Å"Mr. Hyde was pale and dwarfish, he gave an impression of deformity without any nameable malformation, he had a displeasing smile, he had borne himself to the lawyer with a sort of murderous mixture of timidity and boldness, and he spoke with a husky, whispering and somewhat broken voice† (Stevenson, Chapter, 2). One can easily identify the deliberate attempts the author makes to exhibit the villain in Mr. Hyde. Take the following for reference; Mr. Earnfield describes to Utterson how the creature trampled over a child in the street-â€Å"and then came the horrible part of the thing; for the man trampled calmly over the childs body and left her screaming on the ground. It sounds nothing to hear, but it was hellish to see. It wasnt like a man; it was like some damned Juggernaut† (Chapter, 1). It gives the greatest visual effect of a narration- here, a man is a brute personified! Irony of the expression is that the narrator calls the Mr. Hyde ‘a man’ and ‘a juggernaut’ at the same time. There is another example of how Mr. Stevenson visualizes the wicked image of a true brute. Hyde’s encounter with an old guy referred in page 47 runs like this, â€Å"he broke out in a great flame of anger, stamping with his foot, brandishing the cane, and carrying on (as the maid described it) like a madman., †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. †¦Ã¢â‚¬ ¦..the bones were audibly shattered and the body jumped upon the roadway†(Stevenson, chapter, 4). It shows the maximum of severity that an individual can posses. It is definitely indisputable that the character of Mr. Hyde is the reflection of the devilish mindset of human. There can be probably nothing more brutal about anyone than killing a fellow being for insistent

Choose two questions from three questions Assignment

Choose two questions from three questions - Assignment Example All the same, despite how much we know, there are many myths and legends that have evolved over the years concerning this pivotal era and the war that ensued are, simply, not accurate. Much of this inaccuracy involves the institution of slavery and the slave trade. Although it remains a true crime of humanity and shameful act, it is not exactly the way the history books, television, and film would have us believe. One, particular myth is that the American Civil War was fought specifically and solely to put an end to slavery. We have been told that slavery is a direct evil and consequence of a capitalist system, however, that is hardly true. Slavery in many forms existed long before humans kept actual records, let alone established a capitalist society. Another myth concerning the institution of slavery involves the idea the slavery was a reaction to discrimination and racism, however, race played a very small role in slavery around the world. It was not until the 15th century that slavery became specifically associated with people of African descent. One of the most common myths of African slavery is the image of Caucasian slave masters capturing and netting African natives. This may have occurred in some instances, but the majority of African slaves taken from Africa were enslaved and sold by other Africans. Many believe the United States was the greatest recipient of transported slaves; however that is not true, 90% of the slaves brought directly by ship were taken to the Caribbean. Finally is the com plete misconception that once the African peoples were enslaved they became helpless and compliant. There are more than 250 different reports of slave uprising on board slave ships. These people continued to fight to maintain their freedom and later their history and culture. It was never possible for their Master’s to completely break them down (Mintz 1). From before the Revolutionary War the colonists of new world were already arguing the issue of slavery

Plato's Republic and His Theories About Philosopher Rulers Essay

Plato's Republic and His Theories About Philosopher Rulers - Essay Example In this book, Plato claims that the best way to avoid abuses of power, and thereby avoid some of the worst problems of political life, is to concentrate power in the hands of the wise - philosopher-rulers. There are several reasons that make Plato think that concentrating power in the hands of philosopher-rulers will eliminate abuse of power. In this book, Plato ignores the power of justice and makes philosophy the subject of inquiry. He thinks that the power of a state should be concentrated on philosopher-rulers because of the nature of philosophers. He mentions the gifts of a true philosopher as courage, good memory and quickness. Such people have natural reasonableness or inherent goodness which other people can use to get good things even as they grow old (IDPH 354). According to Plato, the minds of philosophers always love the type of knowledge that reveals to them the external nature that does not differ from corruption and generation (IDPH344). This means philosopher-rulers a re in a position to make a quick detection of corrupt deals and corrupt individuals. Plato further explains that philosophers are lovers of all true being and therefore truthfulness is part of them. They are not willing to renounce others whether they are great or small, more honorable or less honorable. This means that philosopher-rulers stand for the truth in everything. This includes those issues that benefit them personally and those that may not benefit them directly or at all. This also includes truth in the smallest matters which many rulers tend to cover up. Even though such actions may not affect the citizens directly, the truth remains that it is abuse of power. They are therefore more likely to demand for openness and transparency in all actions that affect the larger population just to ensure that the highest levels of truth are maintained. Plato explains that because of their truthfulness, philosopher-rulers detest falsehood and will never receive in their mind falsehoo d intentionally. He goes further to describe truthfulness as the object of affection of philosophers. This is seen where he argues that truthfulness must be affirmed by philosophers. He says of them, â€Å"must be affirmed: for he whose nature is amorous of anything cannot help loving all that belongs or is akin to the object of his affections† (IDPH 344). To make it more convincing, Plato argues that there is nothing that is akin to wisdom as truth. His fellow philosopher Glaucon confirms the same as he states that someone cannot be a lover of wisdom and at the same time, a lover of falsehood. This is to say, wise people are lovers of truth and therefore, they are never lovers of falsehood. These are evident in philosopher-rulers. They would be the best watchdogs, condemners and stoppers of actions that that find their roots in falsehood like corruption and related actions like stealing. Plato ascribes the quality of being ambitious and loving ambitions to philosophers. Havi ng rulers who love ambition can mean nothing better than elimination of every action and person who kills fruits of ambition in the national. Generally, philosopher-rulers have zero tolerance to self-centered leaders who are after heaping part of the national resources for themselves. according to Plato, philosophers are lovers of learning. Plato explains that a true lover of learning must desire the truth right from their earliest youth (IDPH

Job Satisfaction Perceived Efficacy Correlation Dissertation

Job Satisfaction Perceived Efficacy Correlation - Dissertation Example Population and Sample The population for this study included all 139 South Dakota public school special education administrators, including full-time, part-time, and mixed responsibility special education administrators. The information used in the study was gathered from the South Dakota Department of Education 2010-2011 Educational Directory. Data Collection Data collection included the use of three separate surveys. Paul Spector’s Job Satisfaction Survey was used to collect job satisfaction data. Chen, Gully, and Eden’s New General Self-Efficacy Scale was used to collect perceived self-efficacy data. Finally, a researcher-developed demographic survey was utilized to collect demographic data. The survey was posted electronically and all 139 public school special education administrators in the state of South Dakota were invited to participate via email. Names and email addresses of special education administrators were gathered from the South Dakota Department of Educ ation 2010-2011 Educational Directory. A cover letter (see Appendix G) with instructions on how to access the electronic survey was sentto all public school special education administrators in the state of South Dakota, via email. ... The invitees completed 35 useable surveys, accounting for a study response rate of 25.2 percent. Demographics Selected demographic characteristics of the study respondents are presented in Table 4.1. The two largest groups of respondents were aged 36-50 and 50 and over, with each category making up 40 percent of the respondents, while those aged 35 or younger represented 20 percent of the respondents. The majority of respondents were female, representing 71.4 percent. It is important to note that all demographics were computed using the responses provided by respondents. Not all respondents completed all questions. Masters Degrees represented the highest level of education for 40 percent of respondents, which was the largest group. Those holding a Bachelors Degree accounted for 22.9 percent of the respondents. Both the Education Specialist and Doctorate degree each represented 20 percent of the respondents. The current certification question allowed respondents to check all that appl ied so that some respondents selected multiple current certifications. The largest number of respondents, 57.6 percent, responded that their current certification was Special Education Director. Pre-K-8 Principals accounted for 11.4, while 7-12 Secondary Principals comprised 6 percent of respondents. Similarly superintendents also accounted for 6 percent of respondents. One respondent selected Superintendent and Special Education Director, one respondent chose PK-12 Principal, Superintendent, and Special Education Director as his or her current level of certification, one respondent chose PK-8 Principal and Superintendent as his or her current level of certification, and one respondent selected PK-8 Principal, Superintendent and