Modification of amino acids at shock pressures of 3.5 to 32 GPa [0.03%]
施加3.5至32Gpa高压下氨基酸的 modifications研究
E Peterson,F Horz,S Chang
E Peterson
Amino acids were subjected to shock impact over a pressure range of 3.5 to 32 GPa both within and without meteoritic mineral matrices. The extent of amino acid destruction, racemization, and conversion to secondary amino acids was examined....
Ar-Ar chronology of the Martian meteorite ALH84001: evidence for the timing of the early bombardment of Mars [0.03%]
火星陨石ALH84001的氩-氩测年结果：关于火星早期遭受撞击时间的证据
G Turner,S F Knott,R D Ash et al.
G Turner et al.
ALH84001, a cataclastic cumulate orthopyroxenite meteorite from Mars, has been dated by Ar-Ar stepped heating and laser probe methods. Both methods give ages close to 3,900 Ma. The age calculated is dependent on assumptions made about 39Ar ...
Magnetite whiskers and platelets in the ALH84001 Martian meteorite: evidence of vapor phase growth [0.03%]
ALH84001火星陨石中的磁铁石须状体和板状体：蒸汽相生长的证据
J P Bradley,R P Harvey,H Y McSween Jr
J P Bradley
Nanometer-sized magnetite crystals associated with carbonates in fracture zones within Martian meteorite ALH84001 have been examined using analytical transmission electron microscopy. Some of the crystals exhibit distinctive morphologies: f...
Comparative Study
Geochimica et cosmochimica acta. 1996;60(24):5149-55. DOI:10.1016/s0016-7037(96)00383-3 1996
A reexamination of amino acids in lunar soils: implications for the survival of exogenous organic material during impact delivery [0.03%]
月球土壤中氨基酸的重新考察：撞击输送期间外源有机物质存活情况的启示
K L Brinton,J L Bada
K L Brinton
Using a sensitive high performance liquid chromatography technique, we have analyzed both the hot water extract and the acid hydrolyzed hot water extract of lunar soil collected during the Apollo 17 mission. Both free amino acids and those ...
Comparative Study
Geochimica et cosmochimica acta. 1996 Jan;60(2):349-54. DOI:10.1016/0016-7037(95)00404-1 1996
Concentrations and isotope ratios of carbon, nitrogen and sulfur in ocean-floor basalts [0.03%]
海洋海底玄武岩中的碳、氮、硫的浓度及同位素比率
H Sakai,D J Des Marais,A Ueda et al.
H Sakai et al.
Fresh submarine basalt glasses from Galapagos Ridge, FAMOUS area, Cayman Trough and Kilauea east rift contain 22 to 160 ppm carbon and 0.3 to 2.8 ppm nitrogen, respectively, as the sums of dissolved species and vesicle-filling gases (CO2 an...
An isotopic biogeochemical study of Neoproterozoic and Early Cambrian sediments from the Centralian Superbasin, Australia [0.03%]
澳大利亚中央地超级盆地新元古代和早寒武世沉积物的同位素生物地球化学研究
G A Logan,R E Summons,J M Hayes
G A Logan
Organic matter from Neoproterozoic and Early Cambrian sediments of the Amadeus and Officer basins of the Centralian Superbasin, Australia, has been studied for biomarker distributions and the carbon isotopic compositions of kerogen and indi...
Carbon isotopic fractionation associated with lipid biosynthesis by a cyanobacterium: relevance for interpretation of biomarker records [0.03%]
一个蓝藻生物合成脂质相关的碳同位素分馏作用：对生物标志物记录解释的意义
S Sakata,J M Hayes,A R McTaggart et al.
S Sakata et al.
For the cyanobacterium Synechocystis UTEX 2470, grown photoautotrophically to a logarithmic stage of growth, the total lipid extract is depleted in 13C by 4.8% relative to average biomass. Depletions observed for acetogenic (straight-chain)...
Geochemistry of approximately 1.9 Ga sedimentary rocks from northeastern Labrador, Canada [0.03%]
加拿大东北部约19亿年前泥岩的地球化学特征
K I Hayashi,H Fujisawa,H D Holland et al.
K I Hayashi et al.
Fifty-eight rock chips from fifteen samples of sedimentary rocks from the Ramah Group (approximately 1.9 Ga) in northeastern Labrador, Canada, were analyzed for major and minor elements, including C and S, to elucidate weathering processes ...
Comparative Study
Geochimica et cosmochimica acta. 1997;61(19):4115-37. DOI:10.1016/s0016-7037(97)00214-7 1997
Petrography and bulk chemistry of Martian orthopyroxenite ALH84001: implications for the origin of secondary carbonates [0.03%]
火星方辉橄榄岩(ALH84001)的岩石学和主量元素化学及其对次生碳酸盐起源的启示
J D Gleason,D A Kring,D H Hill et al.
J D Gleason et al.
New petrologic and bulk geochemical data for the SNC-related (Martian) meteorite ALH84001 suggest a relatively simple igneous history overprinted by complex shock and hydrothermal processes. ALH84001 is an igneous orthopyroxene cumulate con...
The geochemistry of river particulates from the continental USA: major elements [0.03%]
美国大陆河流颗粒物的主要元素地球化学成分
D E Canfield
D E Canfield
River particulates have been collected from twenty-three rivers from throughout the continental USA. The rivers drain mostly large basins (basin areas range from 2.1 x 10(3) to 2970 x 10(3) km2) composed of mixed lithologies, and spanning a...