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JMDMT #476 Microfossils of Cyanobacteria in Carbonaceous Meteorites
View Duration: 1:03
The James M. DuPont Meteorite Collection - among others. Some of these compounds have also been produced in the laboratory from aqueous ammonia-methane mixtures. Thus, it was considered of interest to discover whether some of these com- pounds are sufficiently reactive to yield amino ...
JMDMT #473 Microfossils of Cyanobacteria in Carbonaceous Meteorites
View Duration: 1:03
The James M. DuPont Meteorite Collection - compounds, 1 of which was tentatively identified as alanine, and ammonium formate. It is known that formic acid and simple aldehydes are formed by the action of ionizing radiation over aqueous solutions of carbonic acid.-- It is also known the ...
JMDMT #472 Microfossils of Cyanobacteria in Carbonaceous Meteorites
View Duration: 1:06
The James M. DuPont Meteorite Collection - with electrical discharges it may be the result of the decreased probability of formation of long chains by processes of methyl radical recombination. (3) By ionizing radiations. The synthesis of organic compounds by ionizing radiation was reviewed ...
JMDMT #467 Microfossils of Cyanobacteria in Carbonaceous Meteorites
View Duration: 1:15
The James M. DuPont Meteorite Collection - Experiments carried out by Miller,** and by Groth and von Weyssenhoff ,*i ' have given evidence that the amino acids glycine and alanine can be synthesized by irradiating wjth short wave ultra- violet light (Krypton 1165, 1235 A, Xenon 1295, 1470 ...
JMDMT #458 Microfossils of Cyanobacteria in Carbonaceous Meteorites
View Duration: 1:12
The James M. DuPont Meteorite Collection - several investigators who used electrical discharges, ultraviolet light, and ionizing radiation. Moreover, when some of the reactive carbon compounds detected in comets were used, the formation of amino acids and hydroxy acids was observed to occur ...
JMDMT #457 Microfossils of Cyanobacteria in Carbonaceous Meteorites
View Duration: 0:57
The James M. DuPont Meteorite Collection - amounts of organic and biochemical compounds. Furthermore, due to the rela- tively low prevailing temperatures and the reducing conditions of the proto- planetary environment, the compounds thus formed would have been pre- served for very long ...
JMDMT #456 Microfossils of Cyanobacteria in Carbonaceous Meteorites
View Duration: 1:01
The James M. DuPont Meteorite Collection -into planet. The main source was, of course, the sun providing ultraviolet light and ion- izing radiation at a rate 10 times as high as that observed at the present time.* A second source was the earth itself with its natural radioactivity ■*■* ...
JMDMT #454 Microfossils of Cyanobacteria in Carbonaceous Meteorites
View Duration: 1:08
The James M. DuPont Meteorite Collection -radiation. In general, it is considered that the parent molecules of CN, NH2 , and OH are hydrogen, cyanide or cyanogen, ammonia, and water, respectively. The parent molecules of the carbon radicals are supposed to be methane, acetylene, and other ...
JMDMT #451 Microfossils of Cyanobacteria in Carbonaceous Meteorites
View Duration: 1:02
The James M. DuPont Meteorite Collection - by the same author.'* Cn the basis of this physical and chemical similarity it is reasonable to assume that the chemical processes which occur in comets by the action of solar radiation, when these bodies are at dis- tances of less than 3 A.U. from ...
JMDMT #342 Microfossils of Cyanobacteria in Carbonaceous Meteorites
View Duration: 0:57
The James M. DuPont Meteorite Collection - and possibly manganese. A sudden increase in vitamin B12 may be the stimu- lus for certain phytoplankton blooms.* Among physical factors, tempera- ture and salinity are effective "selective agents" on the species level. The species specific salinity ...