By John Daintith
This best-selling dictionary comprises over 9,000 entries on all features of technology and gives entire assurance of biology (including human biology), chemistry, physics, the earth sciences, and astronomy. Appendices hide the periodic desk, geological time scale, and animal and plant category. New gains contain digital thumb tags for simple reference, increased parts together with astronomy and earth technology and extra gains on key subject matters corresponding to the sunlight method and Genetically changed Organisms. additionally featured are brief biographies of best scientists and chronologies of particular matters, together with plastics, electronics and mobile biology. either concise and wide-ranging, this dictionary is a perfect convenient reference paintings and nice advent for college kids and non-scientists alike.
Read or Download A Dictionary of Science (5th Edition) PDF
Best science books
Helium was once the 1st aspect ever came across through astronomers. Its presence used to be first indicated within the sunlight and never on the earth. additional, its discovery marked the start of the recent technological know-how of astrophysics.
However, it seems that the occasions resulting in the invention of helium were fairly misrepresented in books, journals, or even encyclopedias. the standard tale approximately its joint discovery in the course of a sunlight eclipse in 1868 via French astronomer Pierre Janssen and past due in England by way of Norman Lockyer, is much from the reality. Janssen by no means pointed out any new spectral line in his reports.
The genuine tale seems to be as dramatic as in fiction. This e-book tells the tale with no jargon, utilizing the phrases of the scientists themselves (from their letters and reports), and rescues the true tale from the backwaters of background.
The frequent tendency in sun physics to divide the sunlight surroundings into separate layers and to differentiate phenomena of sunlight task from phenomena of the quiet sunlight emphasizes the large ranging variety of actual stipulations and occasions taking place within the sun surroundings. This variety spans the variety from a impartial, primarily quiescent surroundings to a hugely ionized, violently convective surroundings; from a site during which magnetic box results are unimportant to a website during which the magnetic strain exceeds the fuel strain, and from a website during which the particle motions are Maxwellian to a website within which an considerable fraction of the debris is sped up to relativistic energies.
Seafood and similar items have a major position within the human nutrition; it offers for the protein wanted and has a dietary composition that has favorable health and wellbeing affects on humans. contemplating the fast bring up on the planet inhabitants and the call for by way of protein wishes which are supplied by means of seafood, the required have to guarantee the standard and safeguard of seafood items has been prioritized.
- Visual Insights: A Practical Guide to Making Sense of Data
- Die Enkel der Raketenbauer: die Bajuvischen Dokumente : Berichte und Briefe aus dem 3.Jahrtausend (n.Chr.) : science fiction-Roman
- The Best American Science and Nature Writing 2011
- La théorie du chaos - Vers une nouvelle science
Extra info for A Dictionary of Science (5th Edition)
Salts formed by amines are crystalline substances that are readily soluble in water. g. quinine and atropine) are used medicinally in the form of soluble salts (‘hydrochlorides’). If alkali (sodium hydroxide) is added to solutions of such salts the free amine is liberated. If all four hydrogen atoms of an ammonium salt are replaced by organic groups a quaternary ammonium compound is formed. Such compounds are made by reacting tertiary amines with halogen compounds; for example, trimethylamine ((CH3)3N) with chloromethane (CH3Cl) gives tetramethylammonium chloride, (CH3)4N+Cl–.
Ames test (Salmonella mutagenesis test) A test to determine the effects of a chemical on the rate of mutation in bacterial cells, and hence its likely potential for causing cancer in other organisms, including humans. Devised by US biologist Bruce Ames (1928– ), it is widely used in 32 screening chemicals occurring in the environment for possible carcinogenic activity. The chemical is applied to plates inoculated with a special mutant strain of bacteria, usually Salmonella typhimurium, and cells that mutate back to the wild type are detected by the occurrence of colonies able to grow on the medium.
AND circuit See logic circuits. Anderson, Carl David (1905–91) US physicist who became a professor at the California Institute of Technology, where he worked mainly in particle physics. In 1937 he discovered the *positron in *cosmic radiation, and four years later was awarded the Nobel Prize. In 1939 he discovered the mu-meson (muon). androecium The male sex organs (*stamens) of a Ûower. Compare gynoecium. androgen One of a group of male sex hormones that stimulate development of the testes and of male *secondary sexual characteristics (such as growth of facial and pubic hair in men).
A Dictionary of Science (5th Edition) by John Daintith