Small-mass graphite preparation for AMS 14C measurements performed at GIGCAS, China

Radiocarbon ◽  
2017 ◽  
Vol 59 (3) ◽  
pp. 705-711
Author(s):  
P Ding ◽  
C D Shen ◽  
W X Yi ◽  
N Wang ◽  
X F Ding
Keyword(s):  
Mass Spectrometry ◽  
Reduction Method ◽  
Small Mass ◽  
University Of California ◽  
Standard Samples ◽  
Carbon Contamination ◽  
Size Dependent ◽  
Chinese Academy Of Sciences ◽  
The University ◽  
Academy Of Sciences

AbstractThe sealed tube Zn reduction method has been applied for small-mass samples ranging from 15 to 100 μg carbon preparation for accelerator mass spectrometry (AMS) radiocarbon (14C) measurements at the AMS-14C Preparation Lab in Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS). The volume of the sealed reactor tube is reduced to ~0.75 cm3 in order to increase the yield of graphite. Graphite targets are measured at the Keck Carbon Cycle AMS Facility at the University of California, Irvine (KCCAMS). The targets generate a maximum 12C+1 current of about 0.5 μA per 1 μg C. The modern-carbon background is estimated to be 0.25–0.60 μg C, and dead-carbon background to be ~0.3–0.9 μg C. Both modern-carbon background and dead-carbon background are size dependent, so the results can be corrected. The precision of the small-mass modern carbon standard samples is±15–25‰ for the size of ~15–20 μg C,±5–10‰ for ~20–50 μg C, and±3–10‰ for 50–100 μg C. Further reduction of dead-carbon and modern-carbon contamination is needed in preparation of small-mass samples at GIGCAS.

scholarly journals Cell scientist to watch – Liang Ge

2021 ◽  
Vol 134 (9) ◽  
Keyword(s):  
Cell Biology ◽  
Molecular Mechanisms ◽  
Life Sciences ◽  
Cholesterol Absorption ◽  
University Of California ◽  
Tsinghua University ◽  
Chinese Academy Of Sciences ◽  
Intermediate Compartment ◽  
The University ◽  
Academy Of Sciences

ABSTRACT Liang Ge pursued his PhD in the lab of Dr Bao-Liang Song at the Institutes of Biochemistry and Cell Biology, Chinese Academy of Sciences, where he studied the molecular mechanisms of cholesterol absorption. In 2011 he moved to California for a postdoc and later a research specialist position with Randy Schekman at the University of California, Berkeley. There, he discovered key roles for LC3 lipidation and the ER–Golgi intermediate compartment in autophagosome biogenesis. Liang established his group in the School of Life Sciences at Tsinghua University at the end of 2017, where he combines cell biology and biochemistry techniques, mouse models and computational biology to study the mechanisms of autophagy and unconventional protein secretion.

Collaboration with China

2014 ◽  
Vol 9 (5) ◽  
pp. 793-800
Author(s):  
Aikichi Iwamoto ◽  
◽  
Zene Matsuda ◽  
Yoshihiro Kitamura ◽  
Takaomi Ishida ◽  
...  
Keyword(s):  
Medical Science ◽  
Hepatitis Viruses ◽  
Highly Pathogenic ◽  
Chinese Academy Of Sciences ◽  
Working Together ◽  
The University ◽  
Academy Of Sciences ◽  
Joint Laboratory ◽  
Hiv 1 ◽  
Japan And China

In Japanese fiscal 2005, the Institute of Medical Science of the University of Tokyo (IMSUT) launched joint laboratory in each Institute of Biophysics (IBP) and Institute of Microbiology (IM) of Chinese Academy of Sciences in Beijing. Japanese investigators have resided in Beijing and been working together with young Chinese scientists. As the principal investigator of the joint laboratory in IBP, Dr. Zene Matsuda have focused on the membrane fusion process in HIV-1 infection and invented a remarkable assay systemto be used for the analysis of themembrane fusion. Dr. Yoshihiro Kitamura started the joint laboratory in IM and handed to Dr. Takaomi Ishida. The research in IM has focus on the epidemiology and molecular biology of HIV-1 and hepatitis viruses. The research in Beijing has been supervised by Dr. Tadashi Yamamoto and then by Dr. Junichiro Inoue. Highly productive collaboration between Dr. Yoshihiro Kawaoka and Dr. Hualan Chen has been producing cutting edge outcomes in the research on highly pathogenic avian viruses and their molecular epidemiology in China. The whole schema of the collaboration between Japan and China has been led by Dr. Aikichi Iwamoto.

scholarly journals The role of geography in sustainable development

2016 ◽  
Vol 4 (1) ◽  
pp. 140-143 ◽  
Author(s):  
Jane Qiu
Keyword(s):  
Sustainable Development ◽  
Clean Energy ◽  
Research Centre ◽  
Chinese Government ◽  
Geographical Society ◽  
Chinese Academy Of Sciences ◽  
The University ◽  
Academy Of Sciences

Abstract China has achieved unprecedented economic growth in the past decades. This has had serious consequences on the environment and public health. The Chinese government now realizes that it is not just the quantity, but the quality of development that matters. It has begun to instigate a series of policies to tackle pollution, increase the proportion of clean energy, and redress the balance between urban and rural development—in a coordinated effort to build a harmonious society. Building a harmonious world was also the theme of the 33rd International Geographical Congress, which was held in Beijing last August. At the meeting, Bojie Fu, a member of National Science Review’s editorial board, shared a platform with geographers from Australia, China, Canada and France to discuss the challenges of urbanization, the roles of geographers in sustainable development, as well as the importance of food security, safety and diversity. Dadao Lu Economic geographer at the Institute of Geography and Natural Resources Research, Chinese Academy of Sciences, Beijing Jean-Robert Pitte Historical and cultural geographer at the University of Paris-Sorbonne in Paris, France Mark Rosenberg Health geographer at Queen's University in Ontario, Canada Mark Stafford Smith Ecologist at the Commonwealth Scientific and Industrial Research Organisation (CSIRO) in Canberra, Australia Bojie Fu (Chair) Physical geographer at the Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing; President of Geographical Society of China

scholarly journals The Keck Carbon Cycle AMS Laboratory, University of California, Irvine: Status Report

Radiocarbon ◽  
2010 ◽  
Vol 52 (2) ◽  
pp. 301-309 ◽  
Author(s):  
Robert K Beverly ◽  
Will Beaumont ◽  
Denis Tauz ◽  
Kaelyn M Ormsby ◽  
Karl F von Reden ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Carbon Cycle ◽  
Accelerator Mass Spectrometry ◽  
University Of California ◽  
Status Report ◽  
Sample Throughput ◽  
Laboratory Procedures ◽  
The University

We present a status report of the accelerator mass spectrometry (AMS) facility at the University of California, Irvine, USA. Recent spectrometer upgrades and repairs are discussed. Modifications to preparation laboratory procedures designed to improve sample throughput efficiency while maintaining precision of 2–3‰ for 1-mg samples (Santos et al. 2007c) are presented.

NEW SPECIES OF CARPHOBORUS EICH. WITH KEY TO SPECIES NORTH OF MEXICO (COLEOPTERA-SCOLYTIDAE)

1933 ◽  
Vol 65 (5) ◽  
pp. 103-106 ◽  
Author(s):  
C. R. Bruck
Keyword(s):  
New Species ◽  
North America ◽  
Bark Beetles ◽  
University Of California ◽  
Western North America ◽  
Intensive Study ◽  
Key To Species ◽  
California Academy ◽  
The University ◽  
Academy Of Sciences

While making an intensive study of the bark beetles of Western North America, I noticed that two of the species in the genus Carphoborus were new. Since the last key to the species of this genus has been compiled (Swaine, 1918) Dr. Swaine has described five new species which with my two would more than double the number in the genus. I therefore feel that a new key should be made.I am indebted to the Museum of the California Academy of Sciences for the use of its collection of this genus, and to Dr. E. C. Van Dyke of the University of California for his helpful criticisms.

scholarly journals Comparison of Independent Δ14CO2 Records at Point Barrow, Alaska

Radiocarbon ◽  
2013 ◽  
Vol 55 (3) ◽  
pp. 1541-1545 ◽  
Author(s):  
H D Graven ◽  
X Xu ◽  
T P Guilderson ◽  
R F Keeling ◽  
S E Trumbore ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Stable Isotope ◽  
Sample Preparation ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Isotope Analysis ◽  
The Other ◽  
University Of California ◽  
Significant Bias ◽  
The University

Two independent programs have collected and analyzed atmospheric CO2 samples from Point Barrow, Alaska, for radiocarbon content (Δ14C) over the period 2003–2007. In one program, flask collection, stable isotope analysis, and CO2 extraction are performed by the Scripps Institution of Oceanography's CO2 Program and CO2 is graphitized and measured by accelerator mass spectrometry (AMS) at Lawrence Livermore National Laboratory. In the other program, the University of California, Irvine, performs flask collection, sample preparation, and AMS. Over 22 common sample dates spanning 5 yr, differences in measured Δ14C are consistent with the reported uncertainties and there is no significant bias between the programs.

The Society's notes

1980 ◽  
Vol 34 (2) ◽  
pp. 265-265
Keyword(s):  
New York ◽  
Particle Physics ◽  
Genetic Recombination ◽  
Genetic Material ◽  
University Of California ◽  
Chemical Physics ◽  
Elementary Particle Physics ◽  
The University ◽  
Academy Of Sciences ◽  
Joshua Lederberg

Election of Foreign Members 1979 Dr Julius Axelrod, Chief of the Section of Pharmacology at the National Institutes of Mental Health, Bethesda, U.S.A. Distinguished for his fundamental discoveries on the pharmacology, biosynthesis and metabolism of biogenic amines. Professor Joshua Lederberg, President of the Rockefeller University, New York, U.S.A. Distinguished for his discoveries concerning genetic recombination and the organization of the genetic material of bacteria, which laid the foundations of many aspects of molecular biology and his important contributions to immunology exobiology, and the application of computers to chemical analysis. Professor Jerzy Neyman, Professor and Director of the Statistical Laboratory at the University of California, Berkeley, U.S.A. Distinguished for his fundamental contributions to statistical theory and inference, with applications in astronomy, ecology, medicine and other fields. Professor Yakov Borisovich Zeldovich, Professor at the Institute of Chemical Physics in the Academy of Sciences, Moscow, U.S.S.R. Distinguished for his outstanding contributions to chemical physics, detonation, elementary particle physics and astrophysics

Construction of Alkylated Stereocenters

2017 ◽  
Author(s):  
Zara M. Seibel ◽  
Tristan H. Lambert
Keyword(s):  
Cross Coupling ◽  
Israel Institute ◽  
University Of Utah ◽  
Chinese Academy Of Sciences ◽  
Palladium Catalyzed ◽  
Institute Of Technology ◽  
Quaternary Stereocenters ◽  
The One ◽  
The University ◽  
Academy Of Sciences

Hirohisa Ohmiya and Masaya Sawamura at Hokkaido University reported (Angew. Chem. Int. Ed. 2013, 52, 5350) the copper-catalyzed, γ-selective allylation of terminal alkyne 1 to produce the chiral skipped enyne 3 with high ee. A method to synthe­size asymmetric skipped diene 6 via copper-catalyzed allylic allylation of diene 4 was developed (Chem. Commun. 2013, 49, 3309) by Ben L. Feringa at the University of Groningen. Prof. Feringa also disclosed (J. Am. Chem. Soc. 2013, 135, 2140) the regi­oselective and enantioselective allyl–allyl coupling of bromide 7 with allyl Grignard under Cu catalysis in the presence of phosphoramidite 8. James P. Morken of Boston College reported (Org. Lett. 2013, 15, 1432) the cross-coupling of allylboronate 11 with a mixture of alkenes 10a,b under palladium catalysis to produce diene 13 with high ee. Jian Liao at the Chengdu Institute of Biology Chinese Academy of Sciences and the University of Chinese Academy of Sciences reported (Angew. Chem. Int. Ed. 2013, 52, 4207) the palladium-catalyzed allylic alkylation of indole using the chi­ral bis(sulfoxide) phosphine ligand 15. Yi-Xia Jia at the Zhejiang University of Technology reported (J. Am. Chem. Soc. 2013, 135, 2983) the enantioselective alkyl­ation of indole to produce the trifluoromethyl adduct 19 using nickel catalysis in the presence of bisoxazoline ligand 18. Sarah E. Reisman at the California Institute of Technology disclosed (J. Am. Chem. Soc. 2013, 135, 7442) the reductive cross-coupling of acid chloride 20 and benzyl chloride 21 using a nickel complex with bisoxazoline ligand 22 and manganese(0) as reductant. Ilan Marek at the Technion-Israel Institute of Technology reported (Angew. Chem. Int. Ed. 2013, 52, 5333) a method for the construction of all-carbon quaternary stereocenters, such as the one present in aldehyde 25, using a diastereoselective car­bometallation of cyclopropene 24 followed by oxidation and ring opening. Switching from methyl Grignard and copper iodide to MeCuCNLi reverses the diastereoselec­tivity of the carbometallation and allows access to the opposite enantiomer. Matthew S. Sigman at the University of Utah reported (J. Am. Chem. Soc. 2013, 135, 6830) the redox–relay oxidative Heck arylation of alkenyl alcohol 27 with boronic acid 26 using a palladium catalyst and pyridine oxazole ligand 28 to produce the γ-substituted aldehyde 29.

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