Pre-colombian america Essay Example | Topics and Well Written Essays - 750 words

Pre-colombian america - Essay Example Incan empire was also a Pre-Columbian empire of America mainly concentrated in the South America. The main difference between the Aztec and the Incan empires is that the Incan empire acted like a large unified integrated empire where as the Aztec empire was considered to be a bigger city controlling a group of smaller cities. At the same time, Incan empire was larger than the Aztec empire and in fact it was the largest empire of the Pre-Columbian America during that period. Incan empire had its capital located in Cuzco. Its main concentration was in South America unlike the concentration of the Aztec empire in Central America. The origin of Incan empire was considered to be highlands of Peru during 1197. The Inca Empire was ruled by the Inca with an administrative units called dominions. Interestingly, the strength of this kingdom lied in its nature of economy in the form of the collective property of the land. They followed an aggressive policy after 1430s and concentrated much on e xpansion of kingdom especially in Western South America nearer to the Andes which comprises of present day countries like Peru, Argentina and Chile. However, during 1533 their last emperor Atahualpa, was killed due to Spanish attack under Francisco Pizarro. Hence the fall of both Aztec and Inca kingdoms was resulted due to attack from Spanish rulers. The main factor responsible for the decline of the Aztec kingdom was the human sacrifice conducted by them irrespective of social and political consequences. In other words, the blind faith in their religious and cultural feelings especially in human sacrifice gave the scope for outside rulers like the Spanish kings to attack and defeat them with a small number of soldiers. The fall of Incan empire was also due to religious factors like their illogical faith in superstitions. The very foundation of Incan empire on mythical thought, conceptualizing the

Dr. Tyrone Hayes lecture Movie Review Example | Topics and Well Written Essays - 250 words

Dr. Tyrone Hayes lecture - Movie Review Example I find this part of the video interesting when testing the role steroid hormone in the testing amphibian development in comparison with human beings. The metamorphosis and the sex differentiation of these animals in this part of the video is quite amazing and logical in our environmental studies as students. 3. Discuss the pros and cons of toxicity testing on animals do you think that animals testing is justified? Do you think it gives accurate results that can be related to human beings? Support your reasoning. The toxicity testing in animals to some extent is justified especially towards the environmental studies. The pro of these studies revolves around human beings welfare especially in relation to the pet animals which they could contact various disease through. This will give an answer and control measures to various infections shared between human beings and animals. Cons on the other hand are concerning the results arrived at via these research works. Example is the Dr Hayes induction of mammary and prostate cancer in the research laboratory rodents to highpoint on the atrazine as a possible course of reproductive cancer in humans. This research work to some extent was never justified. We can generate interest in the regulation of the environmentally harmful chemicals through the reduction of various chemically related diseases such as cancers. This is because the chemicals induced in the environment contain a larger quantity of heavy metals. These heavy metals when human beings are exposed to, are the causative agents of various deadly infection

Noise standard Essay Example | Topics and Well Written Essays - 250 words

Noise standard - Essay Example s of exposure that represent conditions under which it is believed that nearly all workers may be repeatedly exposed without adverse effect on their ability to hear and understand normal speech. Their TLV publications can be accessed through purchase since their publications have copyrights. ACGIH-TLVs do not have a legal force in USA; they are only recommendations/ guides and not regulatory limits due to individual susceptibility, hence ACGIH is not a standard setting body. Regulatory bodies view ACGIH’s guidelines as an expression of scientific opinion. ACGIH has several committees set up that decides which substance is to be selected for study and votes once a year on action terms. Each substance / element is selected based upon its availability, relevance and scientific data. ACGIH has established exposure guidelines for occupational exposure to noise in their Threshold Limit Values (TLVs), 85 dBA PEL with a 3 dBA exchange rate. ACGIH guidelines are used to measure workpla ce and personal noise exposure limits, assess risk of hearing loss, determine the need for hearing conservation program and identifying practical methods of controlling noise exposures. As compared to ACGIH’s guidelines, Occupational Safety and Health Administration (OSHA) a part of the USA’s Department of Labor (USDOL) publish Permissible Exposure Limits (PEL). PEL are regulatory limits enforced on all employers. These PELs were initially based on ACGIH TLVs in 1971. If OSHA determines the need for a specific standard it calls for advisory committees (ad hoc or standing) to develop recommendations. OSHA requires that when workplace exposures exceed 100% of the PEL i.e. exposure exceed 90dBA, feasible engineering or administrative controls must be deployed to reduce noise levels. Engineering control includes redesigning space and operations to reduce noise at source, transmission path or at receivers end. Administrative controls include scheduling and controlling the level of exposure

Technological Advantages Essay Example for Free

Technological Advantages Essay The Patriot Act of 2001 and the Federal Information Security Management Act of 2002 have both been controversial because of their passage. The Patriot Act was passed in response to the terrorist acts of September 11, 2001, and the Federal Information Security Management Act was enacted as an offshoot of the former to help secure our nations internal information, financial and citizen’s personal information. Major advances in information technology have resulted in new ethical issues necessitating the passage and implementation of these acts. The Patriot Act of 2001 was signed in law by President George W. Bush and the key provisions were given a four-year extension by President Barrack Obama in 2011. It has been provocative from the start, with much political dissent, especially from moderates and liberals. (Lindaure,S. 2011) states â€Å"You see, contrary to rhetoric on Capitol Hill, The Patriot Act is first and foremost a weapon to bludgeon whistle blowers and political dissent.† Its intent was to help law enforcement in the gathering of information and to help regulate financial transactions as well to monitor our borders more intensely. The Federal Information Security Management Act of 2002 was written and passed to help secure information vital to the economic and national security interests for the United States. An earlier version was written as part of the Homeland Security Act. Its main goal and purpose is to improve computer and network security within the government and its contractors. The technological advances in past few years have been far and reaching. The  average person cannot keep up with the dizzying pace of new and improved technological products. Criminals and terrorists continue to use the newest and most advanced technology to terrorize the public and steal from them. The 9/11 terrorists could enter the US illegally using fake passports/IDs produced with sophisticated computers and software. Secure and disposable cell phones were used to communicate with and they were financed with money laundered through financial shell organizations that used technology to hide the money. Many very intelligent and well educated computer hackers can/have entered numerous government, private financial organizations, and public institutions and have stolen identities, technology, money, military secrets, data, and private information. Some of the more cutting-edge technological advances that have caused the passing of these acts and the ethical issues are the introduction of Biometrics (facial/voice recognition). Increased video surveillance, which has increased by over 125% since 9/11, work place monitoring through GPS tracking, the transmitting of the location of all cellphones, blackberries, and laptops, when they are on, and database profiling through internet searches, supermarket purchases, credit card purchases, and toll booth marking. The most pressing ethical issue is the loss of individual privacy, personal rights and freedoms. To some people the citizens’ rights have been taken away and set back over 100 years. To others it’s an act of necessity for the good and security of the nation. The detaining of illegal aliens and racial profiling has caused many to question the legal aspects of these bills. The intrusion into citizens’ personal and financial information is also a very controversial ethical issue. Many citizens’ and private organization believe that the government has over-stepped their boundaries and is leaning towards a totalitarian form of government. Feingold,R(Senator)(2001)states that â€Å"You and I have a duty to analyze, to test, to weigh new laws that the zealous and often sincere advocates of security would suggest to us†. In conclusion, many people think that with the advances in technology that we are much safe than we were 20 years ago. This is true in many cases but is it worth the cost of many of the personal freedoms that our Constitution guarantees? The ethical issues that have arisen from these acts will be debated for many years. As long as there are criminals and terrorists there will be a need for action in the form of legislative acts and bills by the government. The safety of the nation as a whole and its private citizen is one of the primary functions of the government and there will always be dissent and division within that government and its constituents as to how it should protect them. References Lindauer S. (May 23, 2001)â€Å"The Intel Hub† retrieved from http://the intelhub.com/2011/05/23/The-patriot-act-when-truth-becomes-treason. Feingold,R(Oct,12,2001) On opposing the U.S.A. Patriot Act by Senator Russell Feingold Retrieved from http://www.archipelago.org/vol6-2/Feingold.htm Federal Information Security Management Act of 2002 retrieved from http://en.wikipedia.org/wiki/Federal_Information_Security_Management_Act_of_202 Patriot Act of 2001 retrieved from http://enwikipedia.org/wiki/Patriot_Act

Lab Results Fermenter Essay Example for Free

Lab Results Fermenter Essay To determine the amount of anti-microbial peptide production by Staphylococcus warneri under various conditions when 2L and 10L Fermented. To Test the effects of one uncontrolled parameters sush as pH, Temperature or dissolved Oxygen and compare findings. To produce anti-microbial activity from Staphylococcus warneri.Staphylococcus warneri is a member of bacterial genus Staphylococcus, consisting of Gram-positive bacteria with spherical cells appearing in clusters. Colonies of S. warneri are usually tan, yellow and about 2-4mm in diameter after 48 hours incubation at 35Â °C. It is commonly found as part of the skin flora on humans and animals. S. warneri rarely causes disease, but may occasionally cause infection in patients whose immune system is compromised. S. warneri is known to produce antimicrobial peptide activity in the form of Nisin. The optimum conditions for this to occur are pH 7. Nisin is a polycylic antibacterial peptide with 34 amino acid residues used as a food preservative. It is produced by bacterium and which contains antimicrobial activity and which is known as a bacteriocin. Nisin has been found to have properties that can control spoilage caused by lactic acid bacteria.

Critical Review of Henkel (2014)

Critical Review of Henkel (2014) Review of â€Å"Point and shoot memories: The influence of taking photos on memory for a museum tour† by Henkel Introduction In psychology, it is important to review literature critically. Questions require to be asked of all research, both prior and subsequent to publishing. Matters such as justification for the research, the approach taken to carry out the research, the results of the research and its generalizability all require to be examined in order to establish whether the findings are worthwhile and reliable. This essay will take such an approach and critically analyse a recent study carried out by Henkel (2014). The article, published in Psychological Science, will be reviewed with any shortcomings addressed and suggestions made for improvement. Overview of paper Henkel (2014)suggests that photography is a common pastime, with more than three billion photographs having been taken in 2012. Citing a variety of evidence, Henkel (2014) suggests that the review of photographs can assist with the retrieval and activation of memories. This applies to both healthy individuals (Hodges, Berry, Wood, 2011) as well as people with specific pathologies (Berry et al., 2007; Loveday Conway, 2011). With the foregoing in mind, it is proposed that research to date has not elucidated how the conscious taking of a photograph affects the subsequent memory of what has been captured. The hypothesis proposed is two-tailed and suggests that memory performance following the taking of a photograph will either be improved, or impaired. In order to investigate this question, Henkel carried out two relatively simple experiments in which participants were required to carry out a visit to a museum. In the first experiment, participants were divided into two separate groups and requested to either view or take photographs of specific objects in the museum, such that all objects were both viewed and photographed once. Subsequent to the visit, participants were given an assessment of their memory for both the location of the objects and the objects themselves by means of a free recall test, followed by a recall test based on a list of object names. In addition to the object name recall test, participants were required to indicate their confidence in the accuracy of their responses. Finally, a recall test was administered to participants based on photographs of objects. Across all recall tests, participants were required to indicate whether the object in question had been observed, photographed or had not been part of the tour. Results suggest that photographing an object has a negative impact on a person’s memory for that object, although participants could remember whether an object had been photographed or viewed at better than chance levels. Participants were, however, better at remembering objects from a photographic cue, as opposed to a name cue. Following the first experiment, some further questions were raised in connection with the procedure and a second experiment took place with a view to clarifying these. The procedure in the second experiment was broadly similar, although objects on the tour were split into three groups requiring them to be photographed in full, in part, or viewed, such that all objects were photographed in full, in part and viewed once. The post-visit memory tests administered to participants were similar, with the exception that participants did not participate in the free recall test. In the name recall test, participants were required to answer two questions about the object and in the event that a specific part of the object had been photographed, a question was asked about that part, as well as a more general question about the object. Results replicated those of the first experiment, in that there was an impairment effect of taking a photograph generally, as well as the previous observation that memory for whether an object had been photographed or viewed was better than chance. In contrast, when an object had a specific part photographed, memory for that part , as well as the object more generally, was improved. Methodological comments Participants In experiment 1, it is noted that two thirds of participants had indicated a previous visit to the museum in question, although not within the month prior to the experiment. No such note is made in respect of the participants in experiment 2. This may be an oversight, or it may be that all of the participants in experiment 2 are, in fact, naà ¯ve participants. In the event that this is an oversight, the simplest resolution would have been to insert a line in the original manuscript to identify how many participants in experiment 2 had previously visited the museum. In the event that all participants in experiment 2 were naà ¯ve, it may prove problematic when comparing the two experiments. Ideally, all participants in this sort of experiment should be naà ¯ve, as a previous visit to the museum may give those participants a memory advantage over those who have not visited. It is unclear how this may have affected the results of the experiments, but future experiments of this nature may look to deal with participants with a previous experience by using a quasi-experimental design (Bryman, 2008). Such a design would allow for participants’ previous experience to be catered for, although the negative impact of such a design is that causality cannot be fully inferred from the results (Bryman, 2008). Method of recording accuracy of memory recall When recording participants’ responses in experiment 1, a free recall test was used initially, followed by tests to measure recall prompted by a name or a photograph. The photograph prompt recall task is well explained in the paper and does not require attention here. Unfortunately, detail relating to the free recall task is slightly less clear. Participants were requested to recall the names of objects on the museum tour, indicating whether they had been observed or photographed. Where an object name could not be remembered, participants were requested to write a brief description of the object. The major issue with this particular aspect of the experiment is that no detail is provided in respect of how the descriptive element of this task was assessed. In the circumstances, it may have been a better option to have only graded responses dichotomously, ensuring that responses where the participant cannot remember the object are graded as such. This appears to be how the data h as been coded here, although no information is provided in respect of a cut off point for remembered or forgotten where the name cannot be remembered by the participant. In respect of the named recall task, there appears to be no requirement for participants to grade their confidence in the accuracy of their responses, as this data is neither referred to anywhere else in the paper, nor statistically analysed. It is unclear why this particular task was required as the paper makes no reference to participants’ confidence in their memories. As the task does not appear to be completed in experiment 2, one could ponder whether it was actually necessary for experiment 1. Suitability of statistical tests It is well documented that the ANOVA omnibus test is not suitable for data which are proportional in nature due to the fact that the data is restricted by fixed boundaries of 0 and 1 and the error does not follow a normal distribution, amongst other reasons (Crawley, 2005; Field, 2009). In Henkel’s (2014) study, the data in both experiments is measured by way of response frequency which is subsequently converted to proportions. It would appear that an ANOVA is therefore not the most appropriate statistical test. In order to rectify this issue, there are three possibilities. The first possibility is to transform the data, using a procedure such as the arc sine transformation, which has the effect of normalising the error distribution (Crawley, 2005). Transforming the data makes it more appropriate for use in an ANOVA, although care still requires to be taken with interpretation of results. It is not clear from Henkel’s (2014) article whether a transformation has been car ried out on the data and on the basis that it is not noted in the article, it must be assumed that no such transformation has been completed. In the event that a transformation has been carried out on the data, the article should have a note to this effect in order to avoid confusion for the reader. A second proposal to deal with the data would be to carry out a logistic regression, which is a suitable method to use on binomially distributed data, such as proportional data (Crawley, 2005; Field, 2009). Using a logistic regression would allow the researched to make predictions about the impact of taking photographs on subsequent memory, however it would not allow inferences of causality to be drawn. In addition, problems with generalisability of results would also arise, as a logistic regression is not assumed to be valid for predictions which do not apply to the dataset (Crawley, 2005; Field, 2009). The final suggestion for rectification of the problems with statistical procedure is to avoid using proportional data altogether and measure simple response frequencies. This would require a change in the statistical test used for the experiments to the chi-squared test for independence (Pearson, 1900). Again, the main issue with this course of action is that it would no longer be po ssible for the experiment to indicate causality, as the chi-squared test is correlational in nature. Nonetheless, this may be an appropriate course of action with a view to prompting further research in relation to memory for items which have been photographed and the causal effect of taking such photographs. General comments Introduction The introduction is concise and follows a clear, coherent structure. The reasons for the research question and subsequent experiment are clearly detailed. Experiment 1 Aside from the issues identified in the previous section, the methods section is clear, coherent and concise. Whilst not everything required for a replication is included, with some minor additions, the relevant information would be available. At the foot of the results and discussion section (p.398), results of a Source x Retrieval Cue ANOVA are reported without any statistics quoted. The statistics are reported in respect of an interaction, but not for the main effects. It may be that the main effects are not statistically significant, however, for the purposes of clarity, it would be better for them to be reported here. Experiment 2 The rationale behind experiment 2 follows on from experiment 1. The background is clearly and concisely laid out and seems logical. Other than the issues noted previously in respect of methodology, no further problems are noted in respect of the methods applied in the experiment. General discussion In the final paragraph of the general discussion (p. 401) the results are discussed outwith the parameters of the experiments in, one would assume, an attempt to generalise the results more widely. The final sentence appears to make a claim relating to interacting with photos and the effect of interaction on memory. Whilst previous evidence is referred to, it is not clear how this assertion can be made from the results of this experiment, as no attempts were made to show the effect of interaction with photographs on memory. It may be that this conclusion should be revised in order to make a better fit with the results of the experiment. Conclusion In summary, this study appears to be novel and timely, following from and adding to recent research findings. There is a defined gap in the literature in relation to the focus of the study which could be addressed by it. In addition the study may provoke future research into photographs and memory in the social environment, outwith the scenario of a museum visit, which will allow further generalisation of the findings. Despite the issues identified in relation to methodology, the article is well written and the research generally well designed. With a few minor tweaks in relation to statistical tests and provision of further information for the purposes of replication, the article could be improved further. Nonetheless, this series of experiments is novel, appropriate, timely, and adds to the current understanding of memory in relation to photographs more generally. References Berry, E., Kapur, N., Williams, L., Hodges, S., Watson, P., Smyth, G., †¦ Wood, K. (2007). The use of a wearable camera, SenseCam, as a pictorial diary to improve autobiographical memory in a patient with limbic encephalitis: A preliminary report. Neuropsychological Rehabilitation, 17, 582–601. Bryman, A. (2008). Social Research Methods (3rd Ed.). Oxford: Oxford University Press. Crawley, M. J. (2005). Statistics: An Introduction Using R. Chichester: Wiley. Field, A. (2009). Discovering Statistics Using SPSS (3rd Ed.). London: Sage. Henkel, L. A. (2014). Point-and-shoot memories: the influence of taking photos on memory for a museum tour. Psychological Science, 25, 396–402. Hodges, S., Berry, E., Wood, K. (2011). SenseCamà ¢Ã¢â€š ¬Ã‚ ¯: A wearable camera which stimulates and rehabilitates autobiographical memory. Memory, 19, 685–696. Loveday, C., Conway, M. A. (2011). Using SenseCam with an amnesic patient: Accessing inaccessible everyday memories. Memory, 19, 697–704. Pearson, K. (1900). On the criterion that a given system of deviations from the probable in the case of a correlated system of variables is such that it can be reasonably supposed to have arisen from random sampling. Philosophical Magazine, 50(5), 157–175.

Ray Bradbury :: essays research papers

Ray Bradbury has written over more then five hundred published works and continues to keep writing. He is known as one of the best science fiction novelists and has won many awards and accommodations for it. After publishing his adult novel Fahrenheit 451, it was soon considered one of his best works. There is a question to be asked, Where does he get his inspiration and imagination to write wild stories of great fantasy? He stated that "When people ask me where I get my imagination, I simply lament, God, here and there, makes madness a calling" (Bradbury I). 	American novelist, short-story writer, essayist, playwright, screenwriter, and poet. Ray Bradbury was born in Waukegan, Illinois on August 22, 1920, the third son of Leonard Spaulding Bradbury and Esther Marie Moberg Bradbury. In the fall of 1926 Ray Bradbury's family moved from Waukegan, Illinois to Tucson, Arizona, only to return to Waukegan again in May 1927. By 1931 he began writing his own stories on butcher paper. His childhood was very important to him because it was a constant source of intense sensations, feelings, and images that generate great stories. As a child he was first inspired by seeing "The Hunchback of Notre Dame". "His childhood was that of a pleasant memory of a half-forgotten dream" (Person I). In 1932, after his father was laid off his job as a electrical lineman, the Bradbury family again moved to Tucson and again returned to Waukegan the following year. In 1934 the Bradbury family moved to Los Angeles, California. Bradbury graduated from a Los Angeles High School in 1938. His formal education ended there, but he furthered it by himself -- at night in the library and by day at his typewriter. He sold newspapers on Los Angeles street corners from 1938 to 1942. Bradbury's first story publication was "Hollerbochen's Dilemma," printed in 1938 in Imagination!, an amateur fan magazine. In 1939, 11Bradbury published four issues of "Futuria Fantasia", his own fan magazine, contributing much of the published material himself. Bradbury's first paid publication was "Pendulum" in 1941 to"Super Science Stories." In 1942 Bradbury wrote "The Lake," the story in which he discovered his distinctive writing style. By 1943 he had given up his job selling newspapers and began writing full-time, contributing numerous short stories to magazines such as "Black Mask", "Amazing Stories" and "Weird Tales." In 1945 his short story "The B ig Black and White Game" was selected for Best American Short Stories.