Investigate the Effect of Caffeine on the Heart Rate of Daphnia

Aim: In this experiment we are trying to find out how varying the concentration of caffeine can affect the heart rate of Daphnia shrimp.Prediction: I predict that caffeine will increase the heart rate of the shrimp.IntroductionI believe the results will comply with my prediction. Caffeine is a compound found in especially tea and coffee plants and acts as a natural pesticide.Caffeine is a central nervous system stimulant meaning it increases the amount of neurotransmitters released meaning coffee is a stimulant that affects the central nervous system by increasing its activity. In this practical the caffeine should have a noticeable effect on the heart rate of Daphnia as Daphnia absorbs chemicals present in the solution around it without selection. I also predict that there would be an increase in heart rate once placed in decaffeinated coffee as decaffeinated coffee still has caffeine content but significantly lower per milligram than caffeinated coffee.However I will expect the inc rease of heart rate of the culture placed in caffeinated coffee to be significantly higher than the culture placed in decaffeinated coffee. Daphnia: The reason Daphnia is used as the organism in this experiment is due to its transparent body which makes the heart visible. Daphnia is better than Brine shrimp because brine shrimp is not transparent meaning heart rate has to be measured by counting leg movement. Variables: The independent variable that we change. In this case it is the caffeine content.We would be experimenting with water, decaffeinated coffee and caffeinated coffee to observe and compare its effect on the heart rate of Daphnia. The control for this experiment is a solution with no caffeine which allows us to see if the change in heart rate is due to the caffeine or other factors. To ensure that this experiment is a fair test only the concentration of the caffeine will be changed. Caffeine is the independent variable. I tested each particular concentration of caffeine 10 times.I decided this prior to the experiment because there was bound to results that are out of pattern so repeating this many times would eliminate systematic errors resulting in more accurate and reliable data. The dependant variable is the heart rate of the shrimp will be measured over 10 seconds Ccontrol variables: These are variables that should be kept the same. As a result the effect other factors other than coffee content are limited. This is needed as the objective is to investigate the effects of caffeine content. The control variables ensure valid data.Volume of solution The time heartbeat is measured within Temperature: Daphnia may be very sensitive to the heat therefore the kinetic energy given to them by heat could have effects on the heart rate. Same culture of Daphnia: To minimise genetic differences. The size of the shrimp can change the degree of the effect of caffeine. The larger shrimp will have a lower heart rate. I will ensure this as best as possible by kee ping the Daphnia in the same light intensity by shining a lamp directly at it.Preliminary experimentI did a preliminary experiment to familiarise myself with the methods so no time is wasted during the actual experiment. It helped me identify the limitations in the experiment and how to conduct the experiment appropriately. For example I noted not to add too much of each solution on the microscope as there will be a loss of surface tension and it will spill. I also learnt to not use the slide covers as they kill the Daphnia Analysis The mean heart rate of Daphnia shrimp placed in solution B is 26. 5% higher than the heart rate of the Daphnia placed in the control solution.Furthermore it is 1.9 % less than Solution A ( less difference than I predicted. From these results we can infer that Solution B is the solution containing decaffeinated coffee. This is because the mean heart rate is lower than caffeinated coffee and higher than the control solution. This is because decaffeinated c offee contains caffeine but significantly lower per milligram than caffeinated solution. However this Solution A, caffeinate coffee caused the daphnia heart rate to increase the most. This proves the hypothesis because the greater the caffeine content, the more neurotransmitters are released.The increase in this neuronal stimulation is interpreted as an emergency in organisms causing adrenaline to be released therefore heart rate increases. There still appears to be fluctuations that are probably caused by systematic errors. The data from shrimp placed in solution A (caffeinated coffee) has the greatest variation in results at 168 compared to solution B, 108. Evaluation Reliability: My results appear fairly reliable because there is an obvious pattern occurs and it supports my prediction. The experiment was carried out as a blind trial whereby the solutions except for the control are unknown.This helps eliminate bias whereby I don’t choose some results and ignore others to su pport my prediction making the results more reliable. Validity Systematic errors could have caused this for example I did not give time for the Daphnia to absorb the solution before counting the heart rate. These factors could have also caused the fluctuations in the results so accuracy is questionable. The variation in caffeinated and decaffeinated coffee could have been caused by systematic errors. For example, the Daphnia could have already been dead.There was a significant drop between the eighth and ninth test of solution A ( around 54. 7%) I did not expect this because caffeine is a stimulant drug. This suggest that the shrimp have different tolerance towards caffeine and some may have been dying. Furthermore the heart rate of some shrimp could be distinctly different from the other shrimps as they were trying to escape the cotton fibres which requires more energy thus hear rate increases. This suggests that the culture of Daphnia used in the experiment could have contained sh rimp that are different age and size.Although I tested each concentration 10 times, there is still a lot of variability of the results. Water, on the other hand has the lowest variability of only 60. The variability in the other contents are at 168 (caffeinated coffee) and 108 ( decaffeinated coffee) This could perhaps be the effect of other chemicals in caffeine which Daphnia are responsive to. Accuracy Certain methods of collecting data were not accurate therefore affecting the validity. For example, a random error such as not tapping the pen in the rhythm of the heartbeat affected the number of heart beats per minute.

Review of Wigan Pier essays

Review of Wigan Pier essays This book was about the lives of the unemployed in northern England during the early twentieth century. Orwell also gives a lot of attention to the typical life of a coal miner and his family. He discusses the long hours and horrible conditions that these men face everyday they go to work. He even goes as far as to go down into a coal mine himself to get the experience first hand. In the later part of the book Orwell shifts his focus to the things he found wrong with the Socialists. He touches on the impact Socialists have on each class and how they make it impossible to get out of whatever class you were born into. George Orwell was a journalist and a writer in the early twentieth century. Orwell's goals were to give an accurate description of the life of the working class in Wigan. He also goes on to give his opinion on the rule of Socialists in northern England. The Road to Wigan Pier was written in 1937, but was only published in England at that time. The events and the time period being discussed were current and up to date. Orwell wrote his book as a first-hand experience that could be used as a reliable reference about the working/unemployed class in Wigan. Orwell did not talk to miners to find out what they daily routine was; he experienced it for himself. He was living in the society and was going through the same struggles everyone had to face. In the chapters Orwell goes into detail about the lives of the coal miners I had mixed feeling about his view. At the beginning I thought that he was just taking pieces of facts and pieces of his opinion and combining the two to give a half-accurate report. As I continued to read and saw that he himself went down in to a mine and experienced the work and conditions they actually face, my feelings changed. For him to endure the pain of walking miles hunched over down the mine to the coal face and then breathing the "black air" just to understand what these men go through ...

Online courses Essay Example | Topics and Well Written Essays - 750 words

Online courses - Essay Example not hold the same value as traditional degrees do, but this thesis will try to look at the other side of online degrees as having the same value as the conventional degrees. Online colleges, just like their conventional classroom colleges have to follow the laid down guidelines in offering their degree, online colleges just like conventional ones. They have to teach the mandatory units and subjects in a certain degree program, they have to follow the stipulated timelines and grading of the students must be done at regular intervals in a similar way the conventional colleges do (Koontz, Li and Compora 38). In online degree programs, the subjects are taught by a teacher and not a programmed robot as some think, class notes are sent by the teacher to the students through email. The teacher interact with his students online through various ways such as online video chats and message boards, the tests are done online and they are graded by an actual teacher. In a survey conducted to determine the perception of employers toward online degrees, in 2001 only twenty-nine per cent of employers said they would not hire students with online degrees. The rest seventy-one percent said they did not mind the whether the degree was conventional or online as long it was from an accredited institution of learning and the employee had acquired the relevant skills. Some employers are now preferring online degree holder to the conventional degree holders as the online degree holders are perceived to have certain characteristics such self starters, they have self discipline and are able to meet deadlines. In the workforce, online degrees are valued as a great asset since they show the holder was creative enough to be able to complete the programme online successfully (Palloff, Pratt and Palloff 18). A research conducted by the United States department of education in 2009 found that the students who did online degrees performed much better than those who went to the conventional

Grades inflation in colleges in the USA Research Paper

Grades inflation in colleges in the USA - Research Paper Example The concept of evaluation promotes retention and promotion of lecturers and professors. In this regard, lecturers are usually compelled to please their students Colleges have also shifted more focus towards enrollment in order to meet their budgets. This has been successfully undertaken by awarding higher grades to students in order to create a positive image among people intending to join colleges This issue has been investigated by various governmental and non-governmental organizations. Harvard University is one of the institutions that have pioneered this investigation. It is learning institution that has been affected by this issue thus its results are more credible The institution has also made a suggestion that entails introduction of a grading policy where a student is graded alongside the average grade of that course. In other addition, facilitating proper marking and awarding of grades among lecturers and professors is also another solution that has been proposed. The first suggestion may not be quite effective owing to the fact that it would not necessarily depict lower level of standards. On the other hand, comparison of a student’s performance may also not be accurate, especially when the rest of the class is wrong Provision of quality education is pertinent in any society that aspires to succeed academically. Grade inflation is a challenge in the current education system majorly due to confusions ascribed to it. It does not only affect colleges in the United States, but also in other parts of the world. Undertaking this research is crucial as it facilitates identification of causes of grade inflation as well as probable solutions The research shall focus of grade inflation in colleges in the United States. It shall explore issues associated with it such as: Causes, effects and solutions that have been suggested by Harvard University to reduce grade

Reformation on the modern world Research Paper Example | Topics and Well Written Essays - 1500 words

Reformation on the modern world - Research Paper Example The Reformation age can be also considered as fruition into the age of reason cutting down the legacy of unnecessary theological illusion (Kobe). The paper will be discussing about the impact of the reformation into the modern with the recognition that it was a revolution along with special reference to science, field of art and music and religion. 2. An abridgment of the impacts on the modern world Before moving in to in depth discussion, a brief insight of the impact on the modern world can be elucidated. Firstly, the reformation era splits Christendom into Catholic and Protestant with the destruction of the religious unity of Europe and weakening the authority of church (Holt, 133). The concept of modern secular and centralized state is an attribute of reformation, boosting power to the monarchs at the expense of the church bodies. In this respect it can be stated that the immediate aftermath was the establishment of absolute monarchy and the Protestantism through religious justif ications indirectly contributed to the development of the political liberty which is a predominant feature of the modern west. The notion of equality can be also seen as an evolution of the reformation era the fruits of which are enjoyed in the modern world. ... onscience in the reformation era may be regarded as a precursor of the development of the capitalist spirit and that of the underlying mechanism of the modern economic life (Weber, 42-45). 3. Science and Reformation period The modern science can be regarded as the germinating seed of the reformation period. The doctrine of creation and rationality can be said to be the indispensable part of the reformation period. The herald of scientific explanation in the reformation started from the study and direct observation of the nature. The names of the proponents like Martin Luther, Copernicus holds special reference as they can be regarded as the pioneers in introducing the scientific way of thinking (Kobe). 3.1 Medieval view The medieval world view believed that the nature was an everlasting process and that it kept going from moment to moment by miracle which was new and renewed forever. The presumption was that god; the Almighty was the one who ordered the universe with the help of the miracles. The process was also executed with the human being’s absolute faith in God (Kobe). 3.1 Rationalistic view- An exodus from the medieval view The above stated medieval view was protested in and around the fifteenth century by some intellectuals who wanted to explore the reasons of the miracles which demarcated the rationalistic view of science. The rationalistic view of nature implied that the mind of man is able to forecast the possibilities and impossibilities in the nature with proper justifications. Luther, Copernicus, other reformists and later on Marx also criticized the medieval and superstitious beliefs of the Church (Wuthnow, 492). 3.2 Luther and Copernicus Martin Luther was called the ‘Copernicus of theology’ and Copernicus was called the ‘Luther of astronomy’.

Database Forensics and Auditing Research Paper Example | Topics and Well Written Essays - 2000 words

Database Forensics and Auditing - Research Paper Example The paper will focus on the differences between database forensics and databases auditing. This paper has focus on the definition of database forensic and database auditing, the regulation under database auditing, the meaning of Data Access Auditing, and Data Monitoring. The goal is to clarify the comparison between database forensic and auditing tools by analyzing some of their features. In addition, the paper will show the threats that may affect the database and how it can affect database forensic and auditing. In conclusion, databases can be secured using a number of strategies that restrict unauthorized access, incorrect alteration of data and enhance data integrity to ignore any kind of hacking or losing data. Introduction The Verizon business risk team did an investigation of 90 data breaches occurred in 2008, which revealed an overall score of 285 million stolen records. Likewise, 80% of data breaches occurred due to weak corporate information security and initiated from exte rnal sources i.e. from hackers, malicious codes etc. and 20% data breaches were initiated internally (Goldmann, n.d). Moreover, 49% of data breaches in 2008 were not diagnosed for months. Furthermore, in 2008, 81% organizations affected from credit card breaches were not able to perform their last PCI assessment (Goldmann, n.d). Apart from deploying most updated technology and controls, data is still being compromised. Likewise, tactics of a hacker is categorized as 70 % credentialed users, 10% trading partners and 46% internal threats (Goldmann, n.d). ‘Wikileaks’ and ‘Stuxnet’ virus is one of the recent major security breaches. In summary, the increasing numbers of data breaches are astounding and strive to do more research for database security and protection. It shows that the laws, policies, compliance and regulations are not enough to counter these challenges. In order to protect databases via best practices, we will first differentiate between databas e forensics and database auditing, as there two terms will demonstrate adequate protection from potential threats and vulnerabilities. After describing these terms, we will incorporate Microsoft Log miner tool for collecting forensic evidence from a database and for auditing or reviewing database current state, SQL auditing will be incorporated. Database Forensics Database forensics that is also called Oracle forensics is relatively a new evolving field. Database forensics is conducted by different tools that facilitate Oracle Database Administrator (DBA) to re-establish actions performed on the database with the exception of deactivated forensic features. Likewise, database forensics identifies the suspect by extracting traces of an attacker from the database and revert the suspicious transactions if possible. The primary goal of database forensics is to analyze the vulnerabilities that were utilized and exploited by the threat and to rollback any unofficial data manipulation opera tions. However, it is a daunting task, as attackers play safe and prefer attacks from other regions and IP addresses that involve different time zones and mediums before extracting data or compromising security controls of a database. Some of the vulnerabilities associated with database compromises include default and unchanged usernames and passwords, passwords are not long, complex or easily guessable, Database is not up to date and missing critical updated

Summary of the Somali Language

Summary of the Somali Language Amal Mohamed The Motherland   Ã‚   The place where scientist believe all humans came from is now inhabited by Middle Eastern and North African descends, Somalia. Somalia is a country in the horn of Africa but what makes their culture different from the American culture or any other is that its made up of homogenous people with the same religion, language, ethnicity, and culture. Despite the fact a Roman Catholic cathedral being located in the Somalia capitol Mogadishu, Somalia is a completely Muslim country that follows the teaching of Islam. Islam came to Somalia at a time when Prophet Muhammads companions sought refuge across the Red Sea in the Horn of Africa to escape the prosecution they faced for being Muslim. It is believed that Somalis adopted and accepted the teachings of Islam way before any other Muslim or Arab country did. Islam had been part of the Somali society for more than 1400 years. Majority of the Somali people are Sunni Muslims except for the few who are Sufis. Somalia being a Muslim country and following the teachings of Islam the Sharia Law is used on daily basis,(Quora) Islamic sharia or Islamic law is the religious legal system governing the members of the Islamic faith. It is derived from the religious precepts of Islam, particularly the Quran and the Hadith. The term sharia comes from the Arabic language term sharÄ «ÃƒÅ Ã‚ ¿ah , which means a body of moral and religious law derived from religious prophecy, as opposed to human legislation. Many Somali scholars have remarkably defined the route of Muslim learning and practices throughout the Horn of Africa, the Arabian Peninsula, and furthermore, producing numerous important Islamic figures over the centuries. Uthman bin Ali ZaylaI of Zeila whom is Somali being amongst them. (Ethnomed) Almost all Somalis are Sunni. The religion has a much more comprehensive role in life than is typical in the Americas or Europe. Islam is a belief system, a culture, a structure for government, and a way of life. Thus in Somalia, attitudes, social customs, and gender roles are primarily based on Islamic tradition. For example, the Islamic calendar is based on the lunar month and begins numbering from the year Mohammed arrived in Medina; both this and the Julian calendar are officially recognized and used. In Somalia religion whole big part of the country. The Somali languages is mixed with Arabic, English, and Italian. The language spoken in some many country including Ethiopia, Kenya and Eritrea and further into the North Africa. The three main language the spoken in Somali is Benaadir, Maay, and Northern or Northern-Central. Maay Maay language mainly spoken in Digil and Mirifle (Rahanweyn) clans in the southern of Somalia. (The refworld, Somalia) the southern Somali clans, stated that Maay Maay is a language spoken by clans in the inter-riverine area between the Shabeelle and the Jubba rivers (23 Sept. 1998). The clan families in this area are mainly the Rahanweyn and the Digil but there are also other groups who speak Maay Maay, such as many Bantu villagers along the Jubba and Shabeelle who may not have Somali clan affiliations. The associate professor further stated that due to recent migrations, there are certainly Maay Maay speakers in other parts of Somalia (ibid.). The Benaadir is the 2nd popular language in somila. Benaadir i s usually spoken in Mogadishu (the capital city in Somalia) The Somali ethnicity come from Hamitic people but have Cushitic culture. They are divided into two main clan the Samaal, which includes the Darod, Isaaq, Hawiye, and Dir clan groups the Saab, which includes the Rahanweyn and Digil clans and other smaller clan groups thats not popular. The (Samaal) A Samaal clan kept count of the generations between living members of the group and the ancestor for whom it was named; the greater the number of generations (which often implied substantial internal segmentation into sub clans or lineages) the greater the clans prestige. The sab is the Swedish and they live in the west of Somalia. You dont see them much in t north of Somalia. The Saab language is way different them the Samaal. They usually speak the old language and they are not much of them in the city.       The Somalia culture is way different then the American culture and any other because the Somalia culture is influenced by the religion, Islam. The religion has big influenced in clothing and food. When it comes to the clothing, most Somali dress in adherence to Islamic principles. The Men wears clothe that must cover from neck to knee, and women must be covered from neck to ankle in non-form-fitting clothing. Married women may additionally wear a head scarf /or a shawl (Culture of Somalia). Most Somali speak the Somali language and Arabic because of the influence of Islam, The Quran is writing in Arabic thats why they must learn how to read and write Arabic. (Blog Entries) The Somali practice Muslim holidays, such as Ramadan, the month of fasting to celebrate the revelation of the Quran; Id al-Fitr; the First of Muharram, when an angel shakes the tree of life and death; Maulid an-Nabi (a celebration of Muhammads birth); and Id al-Adha, which commemorates the story of Abraham and his son Ishmael (Shurgin, 2006). When it comes with the engagement, somalin ladys get arranged marriage and they get marry at young age 15 or 16. Marriage is highly valued in the Somali culture and if a woman is not married by the age of 16 she is bringing bad luck to her family. Same sex marriages are not allowed by law. You can get killed by the same sex marriage. (Somalia culture) Marriage traditions in Somalia indicate that in times when a marriage is arranged without consent of the couple, the woman may refuse the marriage if she gains her mothers support. To avoid this situation, the father or male relative of the woman may try to formalize the union without telling the family. Arranged marriages in Somalia can also take place through the conversation of women between sparring tribes, which is viewed as closing a peace agreement. In the American culture the man would ask the father of his girlfriend for her hand in marriage. If the father approves and says yes, then man will propose to his girlfriend. http://countrystudies.us/somalia/38.htm http://www.nationsencyclopedia.com/Africa/Somalia-ETHNIC-GROUPS.html http://www.everyculture.com/Sa-Th/Somalia.html https://ethnomed.org/culture/somali/somali-cultural-profile http://www.bradleyfarless.com/culture-clash-small-town-american-vs-somalian-immigrant-culture/ Works Cited Feature: March/April 2017. Feature: March/April 2017 EthnoMed. N.p., n.d. Web. 09 Mar. 2017. N.p., n.d. Web. Somalia Ethnic Groups. Encyclopedia of the Nations. N.p., n.d. Web. 09 Mar. 2017. Somalia Samaal. Somalia Samaal. N.p., n.d. Web. 09 Mar. 2017. Somalia. Countries and Their Cultures. N.p., n.d. Web. 09 Mar. 2017. Somalia History, Language and Culture. World Travel Guide. N.p., n.d. Web. 09 Mar. 2017.