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Free research essays on topics related to: microscope

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  • Spontaneous Generation Living Organisms
    644 words
    From the time of the Ancient Romans, through the Middle Ages, and until the late nineteenth century, it was generally accepted that life arose spontaneously from non-living matter. Such "spontaneous generation" appeared to occur primarily in decaying matter. For example, a seventeenth century idea for the spontaneous generation of mice required placing sweaty underwear and husks of wheat in an open-mouthed jar. Then, waiting for about 21 days, during which time it was said that the sweat from th...
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  • William Henry British Broadcasting
    1,131 words
    Between 1844 - 6, William Henry Fox Talbot used the title The Pencil of Nature for his set of published prints which featured images of botanical specimens, photogram's, still life and landscapes. Photography was very young at the time of the Pencil of Nature; this set being the first published photographically illustrated book. Talbot first investigated the usage of the camera obscura and camera lucida to aid his sketches by tracing the image projected onto the paper through the prism; it was h...
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  • Life On Mars Electron Microscope
    1,080 words
    ... ite burning up upon entry into the earth's atmosphere vaporizing PAHs near the surface. "No PAHs were found in the meteorite's exterior crust, but the concentration of PAHs increased in the meteorite's interior to levels higher that ever found in Antarctica" Also the concentration of PAHs is greater that what would have been in the atmosphere at the time impacted. Again this makes the source more likely to be extraterrestrial. PAHs that occur in other meteorites within the galaxy their sourc...
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  • Things In Life F A O
    1,239 words
    How does one know that they do not live as well as someone else does? How does one know that they live in a slum? How does one know if they are poor? The answers to these questions are through learning and experiences. Learning may come from books, newspapers, magazines, or people. People can teach through their own experiences, from their own lives, through their own words. In The Lesson, Miss Moore teaches Sylvia and her friends through her own words and books, much to the kids displeasure. Sy...
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  • Galileo Galilei Medical Student Bodies
    521 words
    In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. For Galileo Galilei this thought meant everything. He went against everyone and believed what he thought was true. Many disrespected him and thought he was insane to question the theories of many great scientists of that day. He proved to be right a portion of the time. Galileo the Great fits him better than Galileo Galilei, cause great he was. Galileo was born on February 15, 1564 in P...
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  • Medicine Microsurgery Sew Small
    889 words
    A man came into the emergency ward at one o'clock. His thumb came in an hour later. The surgeon's job: get them back together. The successful re-attaching of fingers to hand requires long hours of painstaking work in microsurgery. In the operating room, the surgeon doesn't stand, but sits in a chair that supports her body. Her arm is cradled by a pillow. Scalpels are present as are other standard surgical tools, but the suture threads are almost invisible, the needle thinner than a human hair. A...
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  • Million Years Ago Dry Land
    722 words
    About four hundred and fifty million years ago, at the end of the Ordovician and in the beginning of the Silurian, the land was desolate and empty. Barren, hardly withered rock grounds, empty sand-, gravel- and clay plains, no green. Maybe some lichens. And at wet spots some algae with a couple of spider-like little creatures creeping around. In the neighbourhood of the mouth of rivers, where the water regularly flooded the land, it was probably green with algae. At such places, e. g. in Austral...
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  • Benign Tumors Malignant Tumors
    1,817 words
    Sarcoma Sarcoma, highly malignant tumor arising in connective- and muscle-cell tissue. It is the result of oncogenes (the cancer causing genes of some viruses) and proto-oncogenes (cancer causing genes in human cells). It may affect bone, cartilage, blood vessels, lymph nodes, and skin. Soft tissue sarcomas are malignant (cancerous) tumors that can develop from fat, muscle, nerve, joint, blood vessel, or deep skin tissues. They can develop in any part of the body. Half of them develop in the arm...
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  • Soft Tissue Radiation Therapy
    1,861 words
    ... in which they developed DNA expression profiles that can be used to accurately diagnose nine soft-tissue sarcoma subtypes, representing approximately 70 % of these cancers. To develop such profiles, researchers use a gene-expression microarray, or "gene chip. " The chip contains thousands of known gene samples printed onto a quartz wafer in tiny dots. When a gene in a study cell matches one on the chip, it binds tightly, like two pieces of a puzzle. The cellular material causes the matched g...
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  • Friction At The Atomic Scale
    1,010 words
    Friction at the atomic scale. From the article "Friction at the Atomic Scale" by Jacqueline Krim we learn that standard friction and friction at the atomic scale are quite different. In my summary paper I would like to try to explain that fact based on the article. Having used different apparatus, the scientists made an experiment to prove that physicists didnt pay enough attention to the study of frictions atomic level or nano tribology for a long time wrongly. However now it was determined tha...
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  • Closer We Are To Understanding Cell Nucleus The Cell Nucleus Human
    285 words
    The Discovery of the Cell Nucleus The cell nucleus was discovered in 1828. At this time no one really understood what it did but eventually it was found to be the control center for the cell and it organelles. The cell was discovered by a Robert Brown, a botanist. Robert Brown invented his own microscope with a crude system of lenses. He used the microscope to observe the nucleus of a plant cell and many other things. It was discovered when he was trying to find out how plants reproduce. Recent ...
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  • Antoni Van Leeuwenhoek Believed In Cells Cell
    340 words
    History of the Cell Theory: Cells, the make-up of all living things. Some cell are complete organisms, such as unicellular bacteria and protozoa. Other types of cells are called multicellular, such as nerve cells and muscle cells. With the cell is genetic material, Deoxyribonucleic Acid (DNA) containing coded instructions for the behavior and reproduction of the cell. The cell was first discovered by the 1665 English scientist Robert Hooke, who studied the dead cells of cork with a crude microsc...
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  • Chemical Reactions Three Types
    890 words
    Chemical Chemical Reactions CHEMICAL REACTIONS Chemical reactions are the heart of chemistry. People have always known that they exist. The Ancient Greeks were the firsts to speculate on the composition of matter. They thought that it was possible that individual particles made up matter. Later, in the Seventeenth Century, a German chemist named George Ernst Stahl was the first to speak of chemical reaction, specifically, combustion. He said that a substance called phlogiston escaped into the ai...
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  • Galileo Galilei Scientific Discoveries
    2,202 words
    The Life and Achievements of Galileo Galilei The paper which I will be writing will discuss the life, discoveries, and the modern impact of the scientific accomplishments of Galileo Galilei. Born in Pisa, Italy in 1564, Galileo entered Pisa University as a medical student in 1581 and became a professor of mathematics at Padua. An astronomer and mathematician, Galileo was, unfortunately for himself, a man ahead of his time. Galileo discovered the law of uniformly accelerated motion towards the Ea...
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  • Professor Of Mathematics University Of Pisa
    1,945 words
    Galileo Galilei was an astronomer and mathematician, he was, a man ahead of his time. Galileodiscovered the law of uniformly accelerated motion towards the Earth, the parabolic path of projectiles, and the law that all bodies have weight. Among his other accomplishments was the improvement of the refracting telescope in 1610 and his advocacy of the Copernican theory which brought him into a conflict ideas and truths between himself and the Inquisition. He was condemned by the church whose theori...
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  • F A O Miss Moore
    921 words
    The The Lesson The Lesson The Lesson, by Toni Cade Bambara, portrays a group of children living in the slums of New York City around 1972. They seem to be content living in poverty in some very unsanitary conditions. One character, Miss Moore, the children? s self appointed mentor, takes it upon herself to further their education during the summer months. She feels this is her civic duty because she is educated. She used F. A. O. Schwarz, a very expensive toy store, to teach them a lesson and in...
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  • Cell Membranes Red Blood
    421 words
    In the early stages of the twentieth century, little was known about cell membranes. Until the early 1950 s, the biological cell membrane was rarely mentioned in scientific literature. It was recognised that something was probably there, but hardly anything about it was known. Considering the lack of technical equipment available a century ago, scientists such as Charles Overton and Edwin Gorter were not only exploring new territory in looking at the properties of cell membranes, but laying the ...
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  • Germ Cells Daughter Cells
    1,558 words
    More than one celled organisms grow by way of mitosis and the cytoplasmic division of body cells. On the other hand, meiosis occurs only in germ cells, which are put aside for the formation of gametes (sperm and egg). Reproduction by meiosis allows for species survival and it increases genetic variability. The process, during which the germ cells are generated is called meiosis. It represents natures solution to the problem of chromosome doubling that would occur, if two diploid cells, i. e. two...
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  • Quality Of Life Parts Of The Body
    1,572 words
    Lung disease (in general) is the number three killer in America, responsible for one in seven deaths. Lung disease and other breathing problems is the number one killer of babies younger than one year old. Lung cancer claims more lives each year than breast, prostate and colorectal cancer combined, but somehow the statistics fail to capture the enormous toll taken by this disease, says Diane Blum. You may ask, Is there a cure? The answer to this question is yes and no. Yes some are cured of canc...
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  • Center Of The Universe Heliocentric Universe
    1,131 words
    The Scientific Revolution A paradigm is one s world view in which one understands his place in it. Copernicus, Galileo, Vesalius, Linneaus, Luewenhoek, and Newton were all medieval scientists, whose work changed people s lives and the world. The way man viewed the universe in which he lived, the world of nature that surrounded him, and even his own physical anatomy changed right before him. Scientists, like Galileo, disproved the heliocentric model as new instruments like the telescope were inve...
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