Search

Your search keyword '"Nagy, Bartholomew"' showing total 241 results
Start Over Author "Nagy, Bartholomew"
241 results on '"Nagy, Bartholomew"'

1. O

Author

Johns, R. Basil, Revill, Andrew T., Walters, Clifford C., Rigali, Mark J., Nagy, Bartholomew, Richardson, Jean M., Hale, Martin, Volkman, John K., Macko, Stephen A., Engel, Michael H., Messenger, Scott, Wakeham, Stuart G., Morgan, John W., Patterson, Charles G., Semken, Steven C., Grossman, Ethan L., Marshall, Clare P., editor, and Fairbridge, Rhodes W., editor

Published
1999
Full Text
View/download PDF

13. Role of organic matter in the Proterozoic Oklo natural fission reactors, Gabon, Africa

Author

Nagy, Bartholomew, Gauthier-Lafaye, Francois, Holliger, Philippe, Mossman, David J., Leventhal, Joel S., and Rigali, Mark J.

Subjects
Gabon -- Natural history, Paleontology -- Proterozoic, Sedimentary structures -- Research, Rocks, Sedimentary -- Research, Earth sciences
Abstract

Of the sixteen known Oklo and the Bangombe natural fission reactors (hydrothermally altered clastic sedimentary rocks that contain abundant uraninite and authigenic clay minerals), reactors 1 to 6 at Oklo contain only traces of organic matter, but the others are rich in organic substances. Reactors 7 to 9 are the subjects of this study. These organic-rich reactors may serve as time-tested analogues for anthropogenic nuclear-waste containment strategies. Organic matter helped to concentrate quantities of uranium sufficient to initiate the nuclear chain reactions. Liquid bitumen was generated from organic matter by hydrothermal reactions during nuclear criticality. The bitumen soon became a solid, consisting of polycyclic aromatic hydrocarbons and an intimate mixture of cryptocrystalline graphite, which enclosed and immobilized uraninite and the fission-generated isotopes entrapped in uraninite. This mechanism prevented major loss of uranium and fission products from the natural nuclear reactors for 1.2 b.y.

Published
1993

15. Precambrian nuclear reactors at Oklo

Author

Nagy, Bartholomew

Subjects
Nuclear fission -- Environmental aspects, Earth sciences
Abstract

Naturally occurring nuclear-fission reactors that were at work 2 billion years ago were discovered in Oct 1972 in Oklo in Gabon, West Africa. The French Atomic Energy Commission observed that nuclear fission reactions expended a portion of the uranium ore U-235, which is necessary for starting nuclear reactions. Suitable techniques have to be adopted to restrict the loss of fission products that adversely affect the environment.

Published
1993

31. Amino acidis derived from Titan tholins

Author

Khare, Bishun N, Sagan, Carl, Ogino, Hiroshi, Nagy, Bartholomew, and Er, Cevat

Subjects
Space Biology
Abstract

The production of amino acids by acid treatment of Titan tholin is experimentally investigated. The synthesis of Titan tholin and the derivatization of amino acids to N-trifluoroacetyl isopropyl esters are described. The gas chromatography/mass spectroscopy analysis of the Titan tholins reveals the presence of glycine, alpha and beta alainine, and aspartic acid, and the total yield of amino acids is about 0.01.

Published
1986
Full Text
View/download PDF

44. Foreword

Author

Nagy, Bartholomew, primary, Leventhal, Joel S., additional, and Grauch, Richard I., additional

Published
1993
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results