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Kinetics of selenium absorption in ligated small intestinal loops of chicks

Journal of Integrative Agriculture 2020年第8期19卷 2095-2102页

作者： LIU Guo-qing zhang shu-min AN Zhi-min FENG Yan-zhong DONG Xue-yu LI Su-fen LU Lin zhang Li-yang WANG Run-lian LUO Xu-gang LIAO Xiu-dong mineral Nutrition Research Division Institute of Animal ScienceChinese Academy of Agricultural SciencesBeijing 100193P.R.China Poultry mineral Nutrition Laboratory College of Animal Science and TechnologyYangzhou UniversityYangzhou 225000P.R.China Heilongjiang Provincial Animal Epidemic Prevention and Control Center Harbin 150069P.R.China Institute of Animal Husbandry Heilongjiang Academy of Agricultural SciencesHarbin 150086P.R.China College of Animal Science and Technology Hebei Normal University of Science and TechnologyQinhuangdao 066004P.R.China Department of Animal Science Guangdong Ocean UniversityZhanjiang 524088P.R.China

Selenium(Se)is an essential trace element that has a large number of biological functions for ***,the absorption kinetics of Se from sodium selenite in the small intestine of broilers remains ***,two experiments were conducted with 28-d-old commercial male broilers to study the kinetics of Se absorption in ligated small intestinal *** experiment 1,the Se absorption in duodenal,jejunal,and ileal segments at different post-perfusion time points(0,20,40,60,80,100 and 120 min)were *** experiment 2,a kinetic study of Se absorption was conducted with the duodenal,jejunal,and ileal loops perfused with solutions containing 0,0.0375,0.075,0.15,0.30,or 0.60μg mL^-1 of Se as sodium selenite,and Se contents in perfusates were determined at 100 min after *** results from experiment 1 showed that the Se absorption increased in an asymptotic response(Pmin in all the small intestinal segments,but increased linearly(Pmin after perfusion in duodenal and ileal segments,while more than 96.0%of the maximum Se absorption occurred at 100 min after perfusion in each small intestinal *** experiment 2,there was no difference(P>0.05)in the Se absorption rate among different ligated small intestinal segments perfused with solutions containing 0.0375–0.15μg mL^-1 of Se,however,the Se absorption rate was higher(Pmin^-1 cm^-1;whereas the Se absorptions were a non-saturated diffusion process in the jejunum and ileum,and the diffusive constants were 2107 and 1777 cm2 min^-1,*** results from the present study indicate that the jejunum is the main Se absorption site,and the Se absorption i

关键词： broiler small intestine selenium absorption kinetics

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Research of multilayers in EUV, soft X-ray and X-ray

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光学精密工程 2005年第4期13卷 512-518页

作者： WANG Zhan-shan WANG Feng-li zhang Zhong WANG Hong-chang WU Wen-juan zhang shu-min XU Yao GU Zhong-xiang CHENG Xin-bin L1 Cun-xia WU Yong-rong WANG Bei QIN shu-jin CHEN Ling-yan Institute of Precision Optical Engineering Department of Physics Tongji University Shanghai 200092 China

To develop beam splitters for soft X-ray laser Michelson interferometer at 13.9 nm, Mo/Si multilayers of 100 nm thickness deposited on both sides of silicon nitride were fabricated by using DC magnetron sputtering. Initial evaluation of their reflectivity and transmission showed that reflectivity and transmission were above 10% and 25%. The broadband analyzers have been designed, fabricated and characterized for 13～20 nm polarization measurements. The measured results are in good agreement with the design. The supermirrors with different angular intervals at 0.154 nm have been designed, fabricated and characterized.

关键词： EUV X射线多层性激光宽带光纤

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On Chromatically Equivalence of a Class of Graphs

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Chinese Quarterly Journal of Mathematics 2010年第2期25卷 308-311页

作者： zhang shu-min Department of Mathematics Qinghai Normal University Xining 810008 China

A class of new graphs is defined. A sufficient condition for pairs of these graphs to be chromatically equivalent is proven.

关键词： chromatic polynomial chromatically equivalent graphs ladder graphs

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Export of nutrients and suspended solids from major Arctic rivers and their response to permafrost degradation

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Advances in Climate Change Research 2021年第4期12卷 466-474页

作者： zhang shu-min MU Cui-Cui LI Zhi-Long DONG Wen-Wen WANG Xing-Yu Irina STRELETSKAYA Valery GREBENETS Sergey SOKRATOV Alexander KIZYAKOV WU Xiao-Dong Key Laboratory of Western China's Environmental Systems(ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou730000China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519000China Cryosphere Research Station on the Qinghai-Tibetan Plateau State Key Laboratory of Cryospheric ScienceNorthwest Institute of Eco-Environment and ResourceChinese Academy of SciencesLanzhou730000China University Cooperation of Polar Research Beijing100875China Geographical Faculty Lomonosov Moscow State UniversityMoscow119991Russia

The rapid warming of the Arctic has led to permafrost degradation,accelerating the transport of terrestrial materials by *** quan-titative assessment of riverine nutrients and total suspended solids(TSS)flux is important to clarify the land-ocean connections in the ***,much is unknown about the estimates of these components from direct measurements in the Arctic rivers and the response of the components to permafrost ***,we report the results from the Arctic Great Rivers Observatory(Arctic-GRO)for the six major Arctic rivers(Yenisey,Lena,Ob',Mackenzie,Yukon,and Kolyma)to investigate the riverine exports of TSS,total dissolved nitrogen(TDN),nitrate(NO3-),bicarbonate(HCO3-),total dissolved phosphorus(TDP),and phosphate(PO43-).The results showed that from 2004 to 2017,the annual TSS,TDN,and NO3-exports to the Arctic Ocean were approximately 106,026 Gg,692 Gg,and 130 Gg,respectively,and the HCO3-,TDP,and PO43-exports were approximately 79,092 Gg,32 Gg,and 18 Gg,*** were remarkable variations in component concentrations and fluxes between *** than 80%of the TDN,TDP,PO43,and TSS exports mainly occurred in spring and summer,and a high HCO3-flux was recorded in summer,while a high NO3-flux in some rivers occurred in *** active layer thickness was significantly positively correlated with the annual TDN,NO3-,and *** addition,the HCO3-flux of the six Arctic rivers increased by 247 Gg per year during *** positive relationship between the active layer thickness and river discharge indicates that permafrost degradation accelerated rivefine carbonate,nitrogen,and phosphorus *** study demonstrates that riverine exports play an important role both in the Arctic terrestrial and marine ecosystems,and permafrost degradation will likely increase the riverine material exports to the ocean.

关键词： Arctic rivers Carbonate Nutrients Total suspended solids Permafrost

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Chromatic Uniqueness of the Complement of T_m(l, 4, m - 6)

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Chinese Quarterly Journal of Mathematics 2004年第2期19卷 133-141页

作者： zhangshu-min DepartmentofMathematics QinghaiNormalUniversityXining810008China

In the paper, we prove that the complement of Tm(1,4,m-6)(m> 10) is chromatically unique if and only if m≠5k(k≥2).

关键词： the least root adjoint polynomial chromatic uniqueness

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Measurement of ionization distributions at nanometre level in tissue-equivalent gas

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Nuclear Science and Techniques 1998年第2期9卷 92-94页

作者： Dang Bing-Rong Wei Zeng-Quan Li Wen-Jian Li Qiang and zhang shu-min (Institute of Modern Phusics, the Chinese Academy of Sciences, Lanzhou 730000 ) InstituteofModernPhysics TheChineseAcademyofSciencesLanzhou730000 InstituteofModernPhysics TheChines

The developed track detector consists of two parts: a small drift region to obtain a good tracking and a relatively large multiplication region for getting an enough high gain at low pressure. All the track detector can be moved in the direction perpendicular to the beam by means of a micrometric screw. An automatic system allows the counting gas to flow continuously at constant pressure through the detector during the measurements. The system can measure ionization distributions at a few nanometer range.

关键词：放射生物学离子化粒子分布纳米级

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现代城镇化发育的土地资源基础

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资源科学 2008年第4期30卷 578-584页

作者：张雷张淑敏中国科学院地理科学与资源研究所北京100101

城市化是一个人类社会活动及生产要素从农村地区向城市地区转移的过程,其结果,城市成为了现代人类社会的生活、生产、消费和污染集聚之地。土地是城镇化发育的唯一空间载体。根据生态系统法则的演绎,城镇发育的土地资源消费或占用是通... 详细信息

城市化是一个人类社会活动及生产要素从农村地区向城市地区转移的过程,其结果,城市成为了现代人类社会的生活、生产、消费和污染集聚之地。土地是城镇化发育的唯一空间载体。根据生态系统法则的演绎,城镇发育的土地资源消费或占用是通过直接、间接和诱发三种方式来实现的。更为重要的是,现代城镇发育的土地资源消费或占用是按照直接<间接<诱发的格局排列,从而构成了与自然生态系统和农村生态系统完全相佐的倒"金字塔"型结构特征。本文进一步从国家和城镇城市化两个层面证实了在这种倒"金字塔"型消费和占用结构的作用下,现代城镇发育的土地资源基础不仅在于城镇所在区域,而且也在于整个国家、乃至全球。

关键词：现代城市化生态法则倒“金字塔”结构土地资源基础

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