Results 61 to 70 of about 3,078 (99)
How Robust is the Cassiterite U-Pb Geochronometer? [PDF]
Goldschmidt Abstracts, 2020 Leonid Neymark +3 more
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Pb(Ⅱ)和Cd(Ⅱ)在长根菇菌丝体中的富集及其对SOD、CAT酶活的影响
四川大学学报. 自然科学版, 2011 以长根菇菌丝体为材料,测定其对Pb(Ⅱ)和Cd(Ⅱ)的富集能力,以及不同浓度的Pb(Ⅱ)和Cd(Ⅱ)对茵丝体超氧化物歧化酶(SOD)和过氧化氢酶(CAT)酶活的影响.研究发现:低浓度Pb(Ⅱ)(100mg/L)明显刺激长根菇茵丝体的生长,而高浓度的Pb(Ⅱ)和Cd(Ⅱ)则抑制其生长;Pb(Ⅱ)和Cd(Ⅱ)的浓度越大,菌丝体对其富集能力越强,其最大富集量可分别达1.2132×10～4mg/kg(Pb(Ⅱ))和1.99872×10～3mg/kg(Cd(Ⅱ)).此外,研究还发现,Pb(Ⅱ)和Cd(Ⅱ ...
陈兰, 陈玉霞, 冯军, 徐恒
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New geological model of the Lagoa Real uraniferous albitites from Bahia (Brazil)
Open Geosciences, 2013 Oliveira Chaves Alexandre
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U-Th and U-Pb geochronology of Quaternary carbonates
National Science ReviewWang, Jian +3 more
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In-situ U-Pb dating of lunar meteorite
Abstracts for fall meeting of the Japanese Society for Planetary Science, 2006 Sasaki, Yu, Trada, Kentaro, Sano, Yuuji
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U/Pb -Isotopenuntersuchungen an Kluftmineralen der KTB [PDF]
, 1994 Brauns, C., Haack, U.
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U/Pb-investigations on Pyrite, Galena and Feldspar
, 1993 Brauns, M., Haack, U.
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U–Pb geochronology of speleothems by MC-ICPMS
Quaternary Geochronology, 2006Abstract Building upon the work of Richards et al. [1998. U–Pb dating of a speleothem of Quaternary age. Geochimica et Cosmochimica Acta 62, 3683–3688], we have developed a method for precise dating of speleothems beyond the range of the U–Th technique using the U–Pb decay scheme.
WOODHEAD J +6 more
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U-Pb age of the Baltoro granite, northwest Himalaya, and implications for monazite U-Pb systematics
Geology, 1989The Baltoro granite is a major late- to post-tectonic plutonic phase of the Karakoram batholith of the northwest Himalaya in northern Pakistan. U-Pb zircon analyses indicate both emplacement at 21.0 ±0.5 Ma and significant Precambrian zircon inheritance.
Randall R. Parrish, Rein Tirrul
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U-Pb AGE OF THE CHATTANOOGA SHALE
Geological Society of America Bulletin, 1960An attempt was made to date the upper black unit of the Gassaway member of the Chattanooga shale which carries the maximum U/Pb ratio. Three samples were analyzed by isotopic dilution techniques. The U238-Pb206 ages on all 3 samples agreed within their experimental errors. The average of the two samples with reasonably small errors gave an apparent age
J. C. COBB, J. L. KULP
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