Robert Hooke Biography (1635 - 1703)

Robert Hooke was an important 17th century English scientist, perhaps best known for Hookes Law, the invention of the compound microscope, and his cell theory. He was born July 18, 1635 in Freshwater, Isle of Wight, England, and died on March 3, 1703 in London, England at age 67. Heres a brief biography: Robert Hookes Claim to Fame Hooke has been called the English Da Vinci. He is credited with numerous inventions and design improvements of scientific instrumentation. He was a natural philosopher who valued observation and experimentation.   He formulated Hookes Law, a relation that says the force pulling back on a spring is inversely proportional to the distance pulled from rest.Assisted Robert Boyle by constructing his air pump.Hooke designed, improved or invented many scientific instruments used in the Seventeenth Century. Hooke was the first to replace pendulums in clocks with springs.He invented the compound microscope and Gregorian compound telescope. He is credited with the invention of the wheel barometer, hydrometer, and anemometer.He coined the term  cells for biology.In his studies of paleontology, Hooke believed fossils were living remains that soaked up minerals, leading to petrification. He believed fossils held clues to the nature of the past on Earth and that some fossils were of extinct organisms. At the time, the concept of extinction was not accepted.He worked with Christopher Wren after the London Fire of 1666 as a surveyor and architect. Few of Hookes buildings survive to the present day.Hooke serv ed as The Royal Societys Curator of Experiments where he was required to perform several demonstrations at each weekly meeting. He held this position for forty years. Notable Awards Fellow of Royal Society.The Hooke Medal is presented in his honor from the British Society of Cell Biologists. Robert Hookes Cell Theory In 1665, Hooke used his primitive compound microscope to examine the structure in a slice of cork. He was able to see the honeycomb structure of cell walls from the plant matter, which was the only remaining tissue since the cells were dead. He coined the word cell to describe the tiny compartments he saw. This was a significant discovery because prior to this, no one knew organisms consisted of cells. Hookes microscope offered a magnification of about 50x. The compound microscope opened up a whole new world to scientists and marked the beginning of the study of cell biology. In 1670, Anton van Leeuwenhoek, a Dutch biologist, first examined living cells using a compound microscope adapted from Hookes design. Newton - Hooke Controversy Hooke and Isaac Newton were involved in a dispute over the idea of the force of gravity following an inverse square relationship to define the elliptical orbits of planets. Hooke and Newton discussed their ideas in letters to each other. When Newton published his Principia, he did not credit anything to Hooke. When Hooke disputed Newtons claims, Newton denied any wrong. The resulting feud between the leading English scientists of the time would continue until Hookes death. Newton became President of the Royal Society that same year and many of Hookes collections and instruments went missing as well as the only known portrait of the man. As President, Newton was responsible for the items entrusted to the Society, but it was never shown he had any involvement in the loss of these items. Interesting Trivia Craters on the Moon and Mars bear his name.Hooke proposed a mechanistic model of human memory, based on the belief memory was a physical process that occurred in the brain.British historian Allan Chapman refers to Hooke as Englands Leonardo, in reference to his similarity to Leonardo da Vinci as a polymath.There is no authenticated portrait of Robert Hooke. Contemporaries have described him as a lean man of average height, with gray eyes, brown hair.Hooke never married or had children. Sources Chapman, Alan (1996). Englands Leonardo: Robert Hooke (1635–1703) and the art of experiment in Restoration England. Proceedings of the Royal Institution of Great Britain. 67: 239–275.Drake, Ellen Tan (1996).  Restless Genius: Robert Hooke and His Earthly Thoughts. Oxford University Press.Robert Hooke. Micrographia. Full text at Project Gutenberg.Robert Hooke (1705). The Posthumous Works of Robert Hooke. Richard Waller, London.

Essay about The Nature of Evil in William Shakespeares...

The Nature of Evil in William Shakespeares Hamlet Works Cited Missing Hamlet is a Shakespearean revenge tragedy, which was a strong, and entertaining form of drama popular in the Elizabethan era during which Shakespeare (1562-1616) lived. Hamlet, like many of Shakespeares plays has been inspired by another famous tragedy, in this case, The Spanish Tragedy, a revenge play written by Thomas Kyd. The great political turbulence that was taking place in England with conspiracies against the Queen and those in power could also have prompted Shakespeare to write a play like Hamlet. Though†¦show more content†¦In Hamlet, Shakespeare has portrayed evil as something that corrupts and deceives and upon analysis, one finds images which give the feeling of disgust and sickness, as in the Ghosts speech in Act 1, Scene 5, where he describes the effect of the poison Claudius had poured in his ears by saying, And curd, like eag er droppings into the milk/The thin and wholesome blood. So did it mine/And a most instant tetter barkd about/Most lazar-like with vile and loathsome crust. Such graphic imagery is found again in Act 5, Scene 4 where Hamlet asks his mother to accept her mistake and not to use Hamlets madness as an excuse for his words - Lay not that madness upon your soul/That not your trespass but my madness speaks/It will but skin and film the ulcerous place/Whiles rank corruption, mining all within/Infects unseen. The continuous use of this sort of vivid and revolting imagery gives a feeling that the world is sick and disgusting and the audience would therefore make the audience realise the fact that evil causes corruption and sickness in the world. Though Hamlet intensely despised Claudius, it was his lustful relationship with the queen, which brought out the fiercest criticism from Hamlet, asShow MoreRelatedThe Nature of Evil in William Shakespeares Hamlet Essay1739 Words   |  7 Pagesgood and evil since the emergence of civilization and, just as humankind has evolved over time, so has the definition of evil. Evil was first used to describe someone who placed themselves above others and it wasnt until the Old and Middle English period that evil became associated with wrong-doing. 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Shallow Foundation Free Essays

Shallow foundations Shallow foundations are those founded near to the finished ground surface; generally where the founding depth (Df) is less than the width of the footing and less than 3m. These are not strict rules, but merely guidelines: basically, if surface loading or other surface conditions will affect the bearing capacity of a foundation it is ‘shallow’. Shallow foundations (sometimes called ‘spread footings’) include pads (‘isolated footings’), strip footings and rafts. We will write a custom essay sample on Shallow Foundation or any similar topic only for you Order Now Shallows foundations are used when surface soils are sufficiently strong and stiff to support the imposed loads; they are generally unsuitable in weak or highly compressible soils, such as poorly-compacted fill, peat, recent lacustrine and alluvial deposits, etc. Pad foundations Pad foundations are used to support an individual point load such as that due to a structural column. They may be circular, square or reactangular. They usually consist of a block or slab of uniform thickness, but they may be stepped or haunched if they are required to spread the load from a heavy column. Pad foundations are usually shallow, but deep pad foundations can also be used. Strip foundations Strip foundations are used to support a line of loads, either due to a load-bearing wall, or if a line of columns need supporting where column positions are so close that individual pad foundations would be inappropriate. The main area of strip foundation are buildings with heavy walls (brick, concrete, stone), and heavy floor slabs. Strip foundation is located on the perimeter exterior walls, and placed under the supporting inner walls of buildings or other areas with increased load. Also strip foundation is well-suited for homes, which is planned to create basement, garage or basement. Strip foundation is also suitable in the case of a possible slight deformation of the base. Typically, strip footing located below the level of soil freezing at 20 cm of sandy soil You can lay the strip foundation and higher levels of freezing, but not more than 60 cm from ground level. For deep-freezing and highly swelling soils usually strip foundation shall not apply. Process itself strip foundation construction is simple, on the other hand it requires a fairly high cost of materials and work on the construction of the foundation. There are criteria for the minimum thickness of the foundation, which can be used building a house. Thus, the minimum thickness of reinforced concrete strip foundation – 10 cm of concrete – 25 cm, rubble concrete foundation – 35 cm, well and laying of natural stone – 50 cm in the construction of strip foundation to be also take into account the permissible load on the soil under the foundation. For clay soils at a depth of 80 cm load should not exceed 2 kg/cm2. In addition to pouring the foundation concrete mixtures, often strip foundations erected using ready-made foundation blocks or bricks. This speeds up the process of building a foundation. It should also be noted that during the construction of strip foundation is an opportunity to save money raising the foundation to the full depth only during the construction of heavy structures. There is still the most reliable option strip foundation remains solid foundation, more time-consuming and requires prior creating formwork and reinforcement training design to increase strength strip foundation. And in this case, the valves must be connected to each other by welding. Raft foundations Raft foundations are used to spread the load from a structure over a large area, normally the entire area of the structure. They are used when column loads or other structural loads are close together and individual pad foundations would interact. A raft foundation normally consists of a concrete slab which extends over the entire loaded area. It may be stiffened by ribs or beams incorporated into the foundation. Raft foundations have the advantage of reducing differential settlements as the concrete slab resists differential movements between loading positions. They are often needed on soft or loose soils with low bearing capacity as they can spread the loads over a larger area. Deep foundations * Piles Deep foundations are those founding too deeply below the finished ground surface for their base bearing capacity to be affected by surface conditions, this is usually at depths 3 m below finished ground level. They include piles, piers and caissons or compensated foundations using deep basements and also deep pad or strip foundations. Deep foundations can be used to transfer the loading to a deeper, more competent strata at depth if unsuitable soils are present near the surface. Piles are relatively long, slender members that transmit foundation loads through soil strata of low bearing capacity to deeper soil or rock strata having a high bearing capacity. They are used when for economic, constructional or soil condition considerations it is desirable to transmit loads to strata beyond the practical reach of shallow foundations. In addition to supporting structures, piles are also used to anchor structures against uplift forces and to assist structures in resisting lateral and overturning forces. Piers are foundations for carrying a heavy structural load which is constructed insitu in a deep excavation. Caissons are a form of deep foundation which are constructed above ground level, then sunk to the required level by excavating or dredging material from within the caisson. Compensated foundations are deep foundations in which the relief of stress due to excavation is approximately balanced by the applied stress due to the foundation. The net stress applied is therefore very small. A compensated foundation normally comprises a deep basement. Types of pile Piles are often used because adequate bearing capacity can not be found at shallow enough depths to support the structural loads. It is important to understand that piles get support from both end bearing and skin friction. The proportion of carrying capacity generated by either end bearing or skin friction depends on the soil conditions. Piles can be used to support various different types of structural loads. End bearing piles End bearing piles are those which terminate in hard, relatively impenetrable material such as rock or very dense sand and gravel. They derive most of their carrying capacity from the resistance of the stratum at the toe of the pile. Friction piles Friction piles obtain a greater part of their carrying capacity by skin friction or adhesion. This tends to occur when piles do not reach an impenetrable stratum but are driven for some distance into a penetrable soil. Their carrying capacity is derived partly from end bearing and partly from skin friction between the embedded surface of the soil and the surrounding soil. How to cite Shallow Foundation, Papers

Immortal Life of Henrietta Lacks free essay sample

On the cover photo Henrietta has her hands on her hips and has not yet reached the ago of 30. She is oblivious to the tumor slowly growing inside her and that she will soon leave 5 children motherless, and lead scientific breakthroughs for decades. The photographer is unknown, yet the picture itself has been in various media. Months before she died cells were cut from her cervix. There are many, many HeLa cells in labs today, an inconceivable number intact. Henrietta died in 1951 from cervical cancer. Before she died a surgeon took samples from her tumor and put them in a petri dish. Her cells reproduced a new generation every 24 hours, the first immortal cells every in a lab. Her cells helped scientists find new ways to treat cancer, herpes, influenza, and Parkinsons. Her cells have become the standard in labs. HeLa cells have been reproducing since 1951. There was little information about Henrietta prior to this book. We will write a custom essay sample on Immortal Life of Henrietta Lacks or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page The family was angry that cells were being sold for $25. 00 a vile. They are also angry that they can barely afford health care when the people who took the cells became rich off of them. January 29, 1951 Henrietta went to the gynecologist. Jones cut out a sample of the tumor and sent it to pathology. Henrietta was born August 1, 1920. Henrietta’s mother died and she was shipped off to live with her grandfather. Henrietta and Day started having children together. Their first child was born when Henrietta was only 14 years old. Henrietta died of uremic poisoning on October 4, 1951; at the age of thirty-one. Shortly after her death planing began for a HeLa factory, in order to stop polio. The public needed a vaccine. On memorial day 1952 tubes containing HeLa cells were packed and were shipped to Minnesota. Sheer put the cells in an incubator and the cells began to grow; this was the first batch of live cells to be shipped in the mail. The NFIP chose the Tuskegee Institute for a HeLa distribution center because of Charles Bynum, director of Negro activity. He wanted it to be located there because it would receive funding, and create jobs. The staff grew to 35 scientists and technicians who produces 20,000 vials of HeLa every week; this was the first every cell production factory. It all stated with the shipping experiment shortly after Henrietta’s death. Black scientists and technicians used cells from a black woman to save the lives of many people at the same time of the infamous Tuskegee syphilis studies. Scientist used Henrietta’s cells to experiment with chemicals, hormones, and viruses. HeLa cells are also malignant and grow much faster than other cells; this in run produces results much, much faster. Eventually scientist discover that hybrids of 2 species could exist in a petri dish with no reproductions; this caused the media to go wild, publishing various sensational headlines. Each new decade has led to breakthroughs in HeLa research. In the 80’s, in a lab, HeLa cells were infected with HIV. The lacks believe that Henrietta lives on (literally) in the cells. Currently Debras son is in prison. HeLa is still one of the most commonly used cells lines in labs toady. In 2009 as the world saw the publication of this book more that 60,000 scientific publications were made on HeLa. They are still contaminating other cell cultures and causing much monitory damage. Jones, Henrietta’s doctor founded the Jones institute for reproductive medicine in Virginia, with his wife. They were responsible for the first â€Å"test tube† baby born in the United States. The Lacks family no longer talk about suing Hopkins, however they still feel they are in tilted to a share of the money from HeLa cells. There is hope of opening a Henrietta Lack museum and getting a tombstone in the Lack cemetery. What I found interesting is the fact that scientist do not have to inform you about when they take your cells with regards to certain procedures. It is estimated that 307 million samples rate kept by doctors, scientist, and labs today from routine medical procedures; they are stored in various storage facilities. The tissue research field is only growing. Scientists use these cells to develop vaccines, they are exposed to radiation, cosmetics, and biological weapons and studied for their responses. Without these tissues vaccines for many of ails today and promising cancer drugs would and could not exist. I also found it quite depressing that Henrietta died shortly after her birthday. It amazed me that doctors would actually lead someone (Henrietta’s husband) to believe that an autopsy could help prevent cancer in his children, simply to collect cells. I am glad that her children did eventually find out about her cells, even though it was many decades later. I found it kind of odd, yet fascinating how the author, Rebecca Skloot became so personally invested in the book, pretty much becoming a part of the Lacks family. I feel like the lack of chronological events added to the story. Dividing the book into life, death and immortality gives the reader a more engaging and exciting experience. Personally I feel that the Lacks family should have been compensated for each vile of Henrietta’s cells. I feel that the instant that the family found out about how Henrietta’s cells were being used they should have been compensated. Overall I really enjoyed the book.