Antoni van Leeuwenhoek essays

Antoni van Leeuwenhoek essays Antoni van Leeuwenhoek (layu-wen-hook) was born in Delft, a city in the western Netherlands, on October 24, 1632. His father was a basket-maker, while his mother's family were brewers. Antoni was educated as a child in a school in the town of Warmond. In 1676 he served as the trustee of the estate for Jan Vermeer, a famous painter, who had had been born in the same year as Leeuwenhoek and is thought to have been friends with him. Also some time before 1668, Antoni van Leeuwenhoek learned to grind lenses, and made simple microscopes, and began observing with them. He seems to have been inspired to take up microscopy after having seen a copy of Robert Hookes illustrated book Micrographia, which illustrated Hooke's own observations with the microscope and was very popular Leeuwenhoek used double-convex lenses mounted between brass plates and held close to the eye. He viewed objects on pinheads, magnifying them up to 300 times this a lot better than any earlier compound microscopes. In 1668 he confirmed and developed the discovery by Italian anatomist Marcello Malpighi of the capillary systems, he showed how the red corpuscles circulated through the capillaries of a rabbit's ear and the web of a frog's foot. In 1674 Leeuwenhoek gave the first accurate description of red blood corpuscles. Leeuwenhoek was not a good artist so he hired an illustrator to prepare drawings of the things he saw, to go with his written descriptions. Later he observed what he called animalcules, which today are known as protozoa and bacteria in pond water, rainwater, and in human saliva. In addition in 1677 he described the spermatozoa of both insects and humans. He was the first to observe human sperm under the microscope. Leeuwenhoek believed that sperm contained a child in miniature, which grew larger inside the females body. Two centuries of experiment and debate followed. Then in 1879, with the use of imp ...

Studying Abroad Just Go For It! [Interview]

Studying Abroad Just Go For It! [Interview] Have you thought of studying abroad? Probably, yes. However, most likely you are not sitting right now at your laptop in some European country reading this post. That means you are not using your opportunities to spend a semester at some country youve never visited, to learn about their culture and their education. Why are you still in doubt? Probably there are some questions on studying abroad which still bother you and keep you from applying for the program. We decided to help you with that and interview a student who already used her studying abroad opportunity. Judy Su is one of the applicants of Danish Institute for Study Abroad program. She has recently got back home from Copenhagen, where she studied graphic design. She kindly agreed to answer several questions about her time spent in Denmark and share her impressions about the experience she had. We started from the most basic question: How did you decide to apply for studying abroad? I go to the University of Michigan, where study abroad is required for Art Design students. I decided to apply to the Danish Institute for Study Abroad because Ive always admired Scandinavian design, and because my University has a good relationship with theirs. So, making a decision was not a problem for you. What about the application? Is the study abroad application process competitive? To my knowledge it wasnt too competitive given our schools requirement, but the application did include questions about my GPA and required a transcript. Next step after the application is preparation for the trip. A bit of packing advice from Judy: Less clothes, only pictures (no souvenirs) from home, less art supplies. So, your trip started and you arived in Copenhagen. What were the barriers youve faced at first? Obviously, the language. I was lucky that in Copenhagen, nearly everyone speaks English very well. Despite that, all the signs that appear on the streets, public transportation, and in grocery stores (among many other places) are entirely in Danish, so I had to piece things together the best I could. What about other cultural differences youve noticed? It appears that mainly the small things you dont really think about are the most interesting cultural differences. For example, there were bicycles everywhere. It was interesting to get used to looking out for bikes more so than for cars when crossing the street. Another interesting difference is that Danes will almost always wait to cross the street until the walk signal is displayed. Jaywalking results in a lot of glares from those waiting. Lets talk a bit about your studies. What subjects have you studied? Visual Journal, Photojournalism, European Art of the 20th Century, and Graphic Design Studio as my core course. What were the most interesting tasks/projects? In my Graphic Design studio, we were designing an identity for Copenhagen Harbor Farming. For my Photojournalism project, I had an assignment to photograph someone Danish for the semester. We also went for field trips for European Art and Graphic Design. For European Art, we went to Ny Carlsberg Glyptotek to look at their Gauguin collection. Did you get writing assignments while studying in Denmark? What kind of them? Besides being an official blogger for the school, I also did some writing for classes. They were pretty standard papers; I took an art history class, so the majority were for that class. Do they have strict plagiarism policy in college? Does it differ from US plagiarism policies? Yes, but my school was a school specifically for study abroad students, so they followed standard US plagiarism policies. I cant imagine plagiarism rules would be any different in other countries. Youve posted weekly plans in your blog. Did they help you manage your time? The weekly goals were more for me to make the most of my time while I was abroad. I wanted to make sure I didnt miss out on anything that I wanted to see, because I didnt know when I would ever be back. What helped you make your studying more effective? I always found it difficult to get things done in my room (I was sharing my room with two other girls), so I would go to the school and finish work up there. By the way, Judy described her accomodation at Copenhagen on her blog. (quote) The three of us share a bedroom. There are also two bathrooms in my hall. There are people on the floor who have singles too, and all of us have keys to our individual rooms. My building is much more apartment style, so you are living independently†¦ Keep in mind though, there are some DRCs that are more dorm style. Some of the building rules can be a challenge to get used to, especially if you’re used to living in a house or off-campus. In a DRC, you will have an RA, and you will have to follow rules regarding quiet hours, chore rotations, and guests. Would the experience of studying abroad be relevant for your future profession? In what way? Oh, absolutely! I studied graphic design as my core course, and learning about it through an international lens is such a valuable experience. It makes you much more aware of the background and perceptions of your work, and Im glad I was able to learn it this way. In addition, I was just exposed to so much thats different from what I used to see in the States. That definitely helped for drawing inspiration. On her return home in Michigan, US, Judy wrote on her blog: Things here seem kind of like they always have, and it’s only the little things that remind me my semester in Copenhagen wasn’t just a dream. So, we decided to ask Judy: How would you describe your Copenhagen time in just one sentence? Going abroad was one of the most exciting and eye-opening experiences Ive ever had. As a final question, please, give some advice for all the students who are considering to study abroad. Just go for it! I have never heard of anyone who regretted going abroad. Once youre there, make sure you make the most of your time. Studying abroad is such a great opportunity, and you wont want to miss a thing! Thanks, Judy Su, for such an inspirational advice and interesting interview! Hopefully, the thoughts of this cheerful design student will change minds of our readers and help them make the right decision on studying abroad.

What are the advantages and disadvantages of asexual and sexual Essay

What are the advantages and disadvantages of asexual and sexual reproduction in animals - Essay Example Division of the zygote takes place repeatedly resulting to the growth of an embryo. This embryo grows inside the female or outside in other animals into multi cellular organism. As a result of the shared genetic information in sexual reproduction by the gametes, the off spring produced contains variety. This constitutes part of the advantages of sexual reproduction since the genetic variation gives the species an advantageous element of survival. Furthermore, genetic variation results to evolution of species which form better organisms (Kent, 2000). This species have better surviving traits in the unstable environments. Species which reproduce sexually have low extinction rates. This is beneficial as it ensures continuity of population. Sexual reproduction has several disadvantages. To this end, the need to have both male and female mate for reproduction is some time inconveniencing since both may not be willing (Rinkevich & Matranga, 2009). It also consumes excessive time and energy to look for a suitable partner. Moreover, there is no assurance after fertilization that the nucleus cell of male will fuse with the female cell. .Furthermore, counter-productive genetic combination conditions should be stable. Asexual reproduction involves one organism producing an offspring identical to it genetically. It requires one parent to reproduce. In single celled organisms the parent cells are split into two cells’ with equal content by binary fission. Multi-cellular organisms use a process known as mitosis to split cells into cells with equal number of chromosomes. Asexual reproduction has several advantages. One, it is very beneficial to the types of animals that stay in one area or not able to look for mates to reproduce. The fact that asexual reproduction does not need mating of female and male gives is advantageous to these animals as they are able to reproduce as they are. Another advantage, since no need to find a mate many off springs are produces

Museum Paper Essay Example | Topics and Well Written Essays - 1000 words

Museum Paper - Essay Example There are various writings on the coffin that indicate of the mummy’s social identity as a fertility god. The major aspect of the writing is the prayer that ensures that Irethorrou is supposed to receive meals that entail of â€Å"good and pure things† to achieve its eternity. The lineage of Irethorrou is outlined on the coffin, and tis includes of the Akhimim city. Based on the information written on the coffin, we note that Irethorrou was a wardrobe-priest, responsible for caring for the god’s statue. This means that the Egyptians purified the statue, cleaned it adnd clothed it on a daily schedule. The major aim of Irethorrou was to specialize in fumeal rituals, since he was a servant of the funerary duty Osiris-Sokar. The mummy boy is wrapped in linen and it has amulets made of stones. They are positioned strategically at crucial points on the swaddling linen. It is important to note that the positioning of the amulets in the linen layer close to the body is described to posses’ magical effects that are connected to the Egyptian belief in resurrection. The amulets are placed on the Mummy in a manner that enables individuals to realize the traditions associated with the treatment of the head. These aim at reawakening and reanimating the body. We note that there are amulets placed on the right eye of Irethorrou, and they have direct associations with the atef god. The deities are situated together with a belief that they will work in a speeded and secure manner to ensure that Irethorrou resurrects. However, we note that the life and death of Irethorrou is not indicated however, it is estimated that the mummy lived to be around forty to fifty years. The cause of his death is not identified although various bumps on its back skin characterize the infection of a deadly disease. The Cantor Arts Center is an art collection center that entails of different works from the entire globe. The collections usually

Dramatic Tension in An Inspector Calls by J.B. Priestly Essay -- Engli

How does J.B. Priestly create dramatic tension in An Inspector Calls? In "An Inspector Calls," dramatic, tension is created in many ways. First of all is Conflict. There is conflict within the family initially. This is mainly in the generations; Mr Birling isn't particularly proud of his son Eric and so he isn't as kind to him as he is to other members of the family. Just keep quiet Eric. As you can see, he doesn't really respect him at all. This is what Mr. Birling says to Eric after Eric asks if it was because of Mr. Birling firing Eva that she committed suicide. Rubbish! If you don't come down sharply on some of these people, they'd soon be asking for the earth. This is Mr. Birling's response after Eric tells him that he wouldn't have fired Eva. Eric is implying here that Mr. Birling was over-reacting in throwing her out, and that he should have kept her working there. After this, Eric once again brings the topic up that Mr. Birling shouldn't have fired Eva. Eric says this: And I don't see why she should have been sacked just because she'd a bit more spirit than the others. This is how Mr. Birling replies to that comment: (Rather angrily) Unless you brighten your ideas, you'll never be in a position to let anyone stay or to tell anybody to go. It's about time you learnt to face a few responsibilities. Mr. Birling saying this shows that he has no faith in his son and he feels that he will not amount to anything. Mr. Birling prefers Gerald to his son. This is obvious as he is always flattering him and giving him more respect than to Eric. This is probably another way to make Eric feel bad, to maybe get him motivated. This is the sort of thing Mr. Birling says to Eric: I'm treating ... ... to help with the baby. All of the sequences connect well and very neatly which helps to give the play more tension; because of what one person, the next thing can happen, and because of what they did, the next thing can happen and so on. This makes the play more exciting and helps it flow better, which shows it is professional and well written. In conclusion to the question, J. B. Priestly creates tension through Conflict, Dramatic Irony, Interrogation Techniques, Relief, Creation of Doubt, chain of consequences and Mystery, and Shock. These methods of creating tension are very effective and ultimately there is a lot of tension in the play. The play can get exciting in certain places due to the tension of what will happen next; what effect will one thing have on another? All in all, the play is Very well written and the dramatic tension is excellent.

Nutrition Essay

1.Select a sweetener. Sucrose 2.Explore the history of the sweetener (when it was developed, its composition). Sucrose, according to our text, is composed of one glucose (the most common sugar molecule) molecule and one fructose (the sweetest natural sugar) molecule. The bond is called glycosidic linkage. Because of this mixture, Sucrose is known to be sweeter than lactose or maltose (the other 2 out of the 3 most common disaccharides, which is a carbohydrate compound consisting of 2 or more molecules joined together). The history of sucrose dates back to thousands and thousands of years ago when the sugar cane was discovered in the South Pacific, rumored specifically to have been found in New Guinea. Its molecular formula is C12H22O11. (taken from Wikipedia) 3.Discuss safety and the sweetener that you have selected. When pure, sucrose has an energy content of 3.94 kilocalories per gram, which helps give someone that instant â€Å"jolt of energy† they are looking for. This becomes unsafe when consumed in large amounts and when looking at it from a health standpoint, should not be used for that jolt. When using Sucrose in moderation, or small doses, it does not pose as may risk factors as it does when over consumed. Also, please note that there really is not any nutritional value in Sucrose itself. Typically, sucrose is spoken of as table sugar. The most common health risk of Sucrose would be linked to tooth decay and other dental issues. Other health issues linked to a diet with an over-abundance of sucrose would be hypoglycemia or diabetes mellitus. 4.Examine the relationship between the sweetener that you have selected and obesity. There is a lot to be said about sugars of any type in your diet. When it comes to Sucrose consumption leading to obesity, it really depends on the type and frequency of the consumption itself. For instance, some drinks containing high levels of sucrose may be linked to the development of obesity and insulin resistance. Also, as said above, it can lead to dental problems and possibly diabetes. It has also been assumed that Sucrose can lead to metabolic syndrome. This is a combination of medical disorders that can increase diabetes and cardiovascular diseases when working together. Because this occurs within the insulin-resistant, it does not necessarily mean you are obese if you’re diagnosed, but it does mean that it can increase ones chances of being obese. So when all is said in done, use Sucrose or any sweeteners for that fact, in low-moderation to avoid any health risks that result in the o ver consumption of Sucrose.

Essay on The Economy of Afghanistan - 1370 Words

The economy of Afghanistan has significantly enhanced since the decline of the Taliban in 2001 due to the infusion of international assistance, the recovery of the agricultural sector, and service sector growth. Regardless of the progress of the past few years, this country is extremely poverty stricken, highly dependent on foreign aid, and landlocked. A lot of the population continues to suffer from shortages of jobs, clean water, electricity, medical care, and housing. Offences, insecurity, lack of infrastructure, and the Afghan Governments difficulty in extending rule of law to all parts of the country produces obstacles to the future economic growth of Afghanistan. Afghanistans living standards are among the lowest in the world.†¦show more content†¦The stunting factor to the growth entrepreneurial of Afghanistan is that there is an inadequacy of availability to infrastructure and markets. The unemployment rate is at 35%. To put it in perspective its nearly 5 times higher than the unemployment rate of America. This country is far away from full employment to say the least. The misery index adds the inflation rate and the unemployment rate. 35% unemployment plus the 5.3 inflation rate leads to a misery index of 40.3, extremely high. However graphs show a positive trend when looking at the unemployment rate. Interests rate also affect the mindsets of home buyers. More specifically they are currently triggering doubt. Afghanistan’s property rights are damaged as it is. There is a weak protection due to lack of property registries and land tiling database. This leads to disputes over who owns land. An estimated 80% of land is sold informally. As stated above Afghanistan ranks 177th in the world for education. This displays the lack of school funding. With poor education, human capital weakens. Human capital also varies directly with entrepreneurship, productivity, and employment. Afghanistans Rule of Law is damaged to say the least. The government is corrupted from the president down to lower levels of government. Illegal opium trafficking fuels the economy with nothing to oppose it. This trafficking is all possible under the weaklyShow MoreRelatedThe Underground Economy in Afghanistan1040 Words   |  5 PagesThe underground economy is a very complex structure, functioning outside the restrictions of legal and tax systems (Tradelinks, 2013). It is also vastly known as the world’s fastest growing economy. Afghanistan is a country located in Southern Asia, East of Iran and North and West of Pakistan. According to the official CIA website, the total population of this war-torn country is 31,108,077 (2013). The country of Afghanistan is often in the eyes of the media, and has had some very tough times becauseRead MoreEssay about Recent Economy of Afghanistan1504 Words   |  7 Pagestheir servant Ali’s son Hassan. Growing up together in Afghanist an during times of peace, they are split up due to unruly events, and the Soviet raid. Leaving behind all their belongings, Amir and Baba escape to America while the place they called home is devastated as the Taliban take over and establish their own regime. Throughout the story, Hosseini’s writings depict the abrupt change in conditions experienced by the people of Afghanistan, as the cruel demeanor of this terrorist group’s reignRead MoreThe Soviet Withdrawal From Afghanistan1224 Words   |  5 Pagesthe 1970s Afghanistan got most of its income from the international state system, but the societies were split between a rural and urban economy. The Soviet withdrawal from Afghanistan in 1989 created predation by commanders and smuggling into Pakistan because of this high risk environment peasants had to adapt. The Taliban was created by Afghan and Pakistan religious leaders to benefit from social capital because of commanders imposed heavy costs on trades between Pak istan and Afghanistan (Rubin,Read MoreDeveloped Country Vs. Developing Countries988 Words   |  4 Pagesthe titles that countries around the world are being labeled by based on the development of their economy and technological infrastructure. Although these countries may carry a likely similar name, they are however completely different in many ways. The two types countries usually differ in their environment, population, education , and living conditions. Most importantly, they obtain distinct economies, which makes them part of two different worlds. What is a developing and developed country, whatRead MoreAfghanistan War Essay1740 Words   |  7 Pagesstarted the war in Afghanistan. It’s been eight years since this incident, and the United States and President Obama still want to keep this war going. Next year they are going to send 30,000 troops to Afghanistan and Iraq. There are three reasons why they shouldn’t send them: one for their safety; two Afghanistan should keep their business to themselves; and three it’s going to affect the economy big time. First of all President Obama is going to send 30,000 troops to Afghanistan next year. My firstRead MoreThe Enduring Strategic Partnership Agreement915 Words   |  4 Pagesrelationship with Afghanistan, to help maintain Afghan sovereignty, maintain peace and prosperity between the United States and Afghanistan, and to take out our common enemy, Al Qaeda and all affiliates [with Al Qaeda].† Another goal of this treaty is to create a functioning democratic government by 2022. The agreement also states that we will help Afghanistan start and maintain a democracy. The Enduring Strategic Partnership Agreement affects the Afghanistan military, geography, economy, and the relationshipsRead MoreWhy Did The Us Invade Afghanistan1158 Words   |  5 PagesWhy did the US invade Afghanistan in 2001? Theoretically, it holds that the United States (US) invaded Afghanistan as a self-defense strategy following the 9/11 attacks. Practically, however, as US foreign policy is about conquest, self-protection and resource-extraction, it seeks strategic dominance of geographical space to sustain its global relevance. The rationality of the US suggests the need to continuously accumulate capital, resources and military proficiency to ensure autonomy. ThereforeRead MoreThe Impact Of Tajikistan On The United States Of The Soviet Union1589 Words   |  7 Pagesconsiderable amounts of turmoil. When it was first declared a sovereign nation it was plunged very quickly in to civil war. The war led to a quick decline in the nation’s economy. This war crippled the nation leaving Tajikistan very weak in the June of 1997 when the war finally drew to a close. This civil war weakened Tajikistan’s legitimate economy and left many people to â€Å"rely on the revenues of illicit opiate trade†. Tajikistan is slowly recovering from the effects of becoming a new nation, plagued withRead MoreThe war on terrorism in Afghanistan has been the longest war in the history of the United States of1100 Words   |  5 Pagesterrorism in Afghanistan has been the longest war in the history of the United States of America, the war that nobody wanted is finally coming to an end. Ever since the September 11th attack on the twin towers in the heart of New York, the United States has led a 13 year long war on terrorism in the war-torn country, Afghanistan. The ending of the war is a major turning point in the history of America and Afghanistan. The ending of the war will be the greatest test on the people of Afghanistan to see howRead MoreJesuit College Preparatory School. . Hot Spot: Bolshevik1564 Words   |  7 PagesJESUIT COLLEGE PREPARATORY SCHOOL HOT SPOT: Bolshevik Revolution and Taliban in Afghanistan A RESEARCH PAPER SUBMITTED TO MR. TRIPLETT SOCIAL STUDIES DEPARTMENT BY Maxwell Abmas DALLAS, TEXAS MAY 12, 2017 The Islamic fundamentalist group known as the Taliban continues to act as a dominant group in Afghanistan even 14 years after the invasion by the US. The Taliban ruled Afghanistan from 1996 until 2001 when an invasion led by the US collapsed the regime due to the Taliban providing