Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Oliver, Botta"'
Autor:
Oliver Botta, Judith Zeh, Melanie Zauscher, Todd M. O'Hara, J. Craig George, Jeffrey L. Bada, Cheryl Rosa
Publikováno v:
Marine Mammal Science. 29:424-445
Fifty-two eyes were collected and analyzed to estimate ages of 42 bowhead whales using the aspartic acid racemization aging technique. Between-eye and within-eye variance components for the ratio of the D and L optical isomers (D/L ratio) were estima
Autor:
Ralph P. Harvey, Renato Zenobi, Jeffrey L. Bada, Jason P. Dworkin, Pascale Ehrenfreund, Christian Emmenegger, Zita Martins, Daniel P. Glavin, Oliver Botta
Publikováno v:
Meteoritics & Planetary Science. 43:1465-1480
We have analyzed ice samples and meteorites from the LaPaz region of Antarctica to investigate the composition of polycyclic aromatic hydrocarbons (PAHs) and amino acids with the goal to understand whether or not there is a compositional relationship
Autor:
Pascale Ehrenfreund, Oliver Botta
Publikováno v:
Astrobiology. 8:464-467
Autor:
A. B. Verchovsky, Richard C. Greenwood, Jason P. Dworkin, Beda A. Hofmann, Zita Martins, Ian A. Franchi, Pascale Ehrenfreund, Oliver Botta, A. J. T. Jull, Daniel P. Glavin, Edwin Gnos
Publikováno v:
Meteoritics & Planetary Science. 42:1581-1595
We have analyzed Shisr 033, a CR chondrite from the Omani desert, using several different analytical techniques designed to study the degree of terrestrial alteration of this meteorite and also its petrologic classification. Bulk chemical analyses (i
Autor:
Mark A. Sephton, Oliver Botta
Publikováno v:
Space Science Reviews. 135:25-35
A fundamental goal of a number of forthcoming space missions is the detection and characterization of organic matter on planetary surfaces. Successful interpretation of data generated by in situ experiments will require discrimination between abiogen
Publikováno v:
Meteoritics & Planetary Science. 42:81-92
CM2 carbonaceous chondrites are the most primitive material present in the solar system, and some of their subtypes, the CM and CI chondrites, contain up to 2 wt% of organic carbon. The CM2 carbonaceous chondrites contain a wide variety of complex am
Autor:
Andrew D. Aubrey, Zita Martins, James H. Doty, Oliver Botta, Daniel P. Glavin, Jeffrey L. Bada, Jason P. Dworkin
Publikováno v:
Meteoritics & Planetary Science. 41:889-902
Amino acid analyses of the Antarctic CM2 chondrites Allan Hills (ALH) 83100 and Lewis Cliff (LEW) 90500 using liquid chromatography-time of flight-mass spectrometry (LC-ToF-MS) coupled with UV fluorescence detection revealed that these carbonaceous m
Autor:
Oliver Botta, Mark A. Sephton
Publikováno v:
International Journal of Astrobiology. 4:269-276
In the next decade, numerous space missions will attempt to detect organic matter on planets and other objects in the Solar System. Recognizing carbon-based life or its remains will be a fundamental goal of future missions. In preparation, studies of
Publikováno v:
Geomicrobiology Journal. 20:427-438
There has long been a debate as to whether desert varnish deposits are microbially mediated or are deposited by inorganic processes. Several researchers have cultured bacteria from the surface of desert varnish suggesting that bacteria are intimately
Publikováno v:
The Astrophysical Journal. 593:L129-L132
Nucleobases are nitrogen heterocycles (N-heterocycles) that are essential components of the genetic material in all living organisms. Extraterrestrial nucleobases have been found in several carbonaceous chondrites, but only in traces. No astronomical