Ancient philosophy The pre-Socratics The central focus of ancient Greek philosophy was the problem of motion.
Born 22 Descartes and hume wax ; died 14 Feb at age Karl Guthe Jansky was an American electrical engineer who discovered cosmic radio emissions in At Bell Laboratories in NJ, Jansky was tracking down the crackling static noises that plagued overseas telephone reception.
He found certain radio waves came from a specific region on the sky every 23 hours and 56 minutes, from the direction of Sagittarius toward the center of the Milky Way.
In the publication of his results, he suggested that the radio emission was somehow connected to the Milky Way and that it originated not from stars but from ionized interstellar gas. At the age of 26, Jansky had made a historic discovery - that celestial bodies could emit radio waves as well as light waves.
George Beadle Born 22 Oct ; died 9 Jun at age Beadle and Tatum succeeded in demonstrating that the body substances are synthesized in the individual cell step by step in long chains of chemical reactions, and that genes control these processes by individually regulating definite steps in the synthesis chain.
This regulation takes place through formation by the gene of special enzymes. American chemist who, during the s and '50s, developed processes for reducing individual rare-earth elements to the metallic state at low cost, thereby making these substances available to industry at reasonable prices.
Earlier, upon the discovery of nuclear fission inthe U. Spedding, an expert in the chemistry of rare earths, agreed to set up the Ames portion of the Manhattan Project, resulting in an easy and inexpensive procedure to produce high quality uranium.
Between andalmost two million pounds of uranium was processed on campus, in the old Popcorn Laboratory. American biochemist who discovered vitamin C, an aid in the prevention of scurvy and malnutrition. After five years of painstaking research extracting components from lemon juice, inKing isolated vitamin C.
Its structure was quickly determined and it was synthesized by scientists such as Haworth and Reichstein in Most organisms synthesize it from glucose but man and other primates and various other species must obtain it from their diet. It is required for the maintenance of healthy connective tissue; deficiency leads to scurvy.
Vitamin C is readily destroyed by heat and light. Thomson for discovering that electrons can be diffracted like light waves, thus verifying the thesis of Louis de Broglie that electrons behave both as waves and as particles.
Davisson studied the effect of electron bombardment on surfaces, and observed the angle of reflection could depend on crystal orientation. Following Louis de Broglie's theory of the wave nature of particles, he realized that his results could be due to diffraction of electrons by the pattern of atoms on the crystal surface.
This discovery has been applied to the study of nuclear, atomic, and molecular structure. Davisson helped develop the electron microscope which uses the wave nature of electrons to view details smaller than the wavelength of visible light. English bacteriologist who, working with George Ingram, was the first to publish a method for isolating and culturing the extremely fastidious Mycobacterium paratuberculosis, the bacterium that causes Johne's disease, or chronic dysentery of cattle.
Twort's somewhat accidental discovery happened when he noticed that the bacteria infecting his plates became transparent. Thinking the virus to be a primitive life form, thereafter he tried to grow viruses in artificial media, but had difficulty funding the research. American agricultural chemist, often called the father of scientific dairying, chiefly because of his development of the Babcock testa simple method of measuring the butterfat content of milk.
It consists in liberating the fat globules by dissolving the casein in a strong acid and then separating the fat by means of a centrifuge. The test discouraged milk adulteration and provided for the first time an adequate standard by which fair payment for milk could be determined, stimulated improvement of dairy production, and aided in factory manufacture of cheese and butter.
He worked for 43 years at the University of Wisconsin, where he established a laboratory where he carried out pioneering research in nutrition and in the chemistry of vitamins. Constantine Rafinesque Born 22 Oct ; died 18 Sep at age Constantine Samuel Rafinesque was a French naturalist, traveller and writer who, in spite of work of variable reliability, still substantially expanded knowledge with extensive travels, collecting, cataloging and naming huge numbers of plants and some animals.
Among these are many new species he is credited with being the first to describe. Years ahead of Charles Darwin 's theory of evolution, Rafinesque conceived his own ideas. He thought that species had, even within the timeframe of a century, a continuing tendency for varieties to appear that would diverge in their characteristics to the point of forming new species.
Accordingly, he was over-enthusiastic at distinguishing what he called new species.In Descartes’ “Meditation II,” he begins his look into sensory perceptions with a very in-depth look into a plain piece of wax - Descartes and Hume Wax introduction.
He explains that there is a very distinct piece of wax, perhaps from a fresh honeycomb. All the physical attributes of this wax can be observed; feel.
Born 22 Oct ; died 14 Feb at age Karl Guthe Jansky was an American electrical engineer who discovered cosmic radio emissions in At Bell Laboratories in NJ, Jansky was tracking down the crackling static noises that plagued overseas telephone reception.
He found certain radio waves came from a specific region on the sky every 23 hours and 56 minutes, from the direction of. Thesis: One primary conﬂict between Hume and Descartes is in their respective principle’s of sufﬁcient reason, and Humes more conservative view is the one which we must take in order to have the most possibly accurate view of reality.
This edition features reliable, accessible translations; useful editorial materials; and a straightforward presentation of the Objections and Replies, including the objections from Caterus, Arnauld, and Hobbes, accompanied by Descartes replies, in their entirety.
about ,, years ago early seaweed formed.. Molecular clock methods indicate that red and green algae arose around 1,,, years ago, and the secondary symbiosis that eventually led to the chromists occurred around 1,,, years ago during the late Mesoproterzoic era, after the earth's transition to a more highly oxygenated atmosphere with an ozone screen.
The Beginning of Modern Science. I expect a terrible rebuke from one of my adversaries, and I can almost hear him shouting in my ears that it is one thing to deal with matters physically and quite another to do so mathematically, and that geometers should stick to their fantasies, and not get involved in philosophical matters where the conclusions are different from those in mathematics.