检索结果-南通市图书馆

Diet control on carbon isotopic composition of land snail shell carbonate

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2007年第3期52卷 388-394页

作者： liu zongxiu GU ZhaoYan WU NaiQin XU Bing Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

Carbon isotope compositions for both the carbonate shells and soft bodies (organic tissue) of living land snails collected mostly from the Loess Plateau, China have been measured. The result shows that δ 13C values range from -13.1‰ to -4.3‰ for the aragonite shell samples and from -26.8‰ to -18.0‰ for the soft body samples. Although the shells are enriched in 13C relative to the bodies averagely by 14.2(±0.8)‰, the shell δ 13Ca values are closely correlated to the body δ 13Corg values, expressed as δ 13Ca = 1.021 δ 13Corg + 14.38 (R = 0.965; N = 31). This relationship indicates that δ 13Ca is primarily a function of the isotopic composition of the snail diets since previous studies have proved that the snail body is the same as their food in carbon isotope composition. In other words, carbon isotope compo-sition of the carbonate shell can be used as a proxy to estimate the dietary 13C abundance of the land snails. The data also support that the 13C enrichment of the carbonate shells results mainly from the equilibrium fractionations between the metabolic CO2, HCO3-in the hemolymph and shell aragonite, and partially from kinetic fractionations when snail shells form during their activity.

关键词：饲料控制蜗牛壳碳酸盐碳同位素成分黄土高原

Geochemical Characteristics of Eolian Deposits in the Chengdu Plain of Sichuan Province and the Implications for Provenance

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2013年第6期87卷 1712-1723页

作者： TAN Yuanlong QIAO Yansong ZHAO Zhizhong WANG Yan QI Lin FU Jianli liu zongxiu YAO Haitao WANG Shubing JIANG Fuchu Institute of Geomechanics Chinese Academy of Geological Sciences Key Laboratory of Neotectonic Movement and Geohazard

In this study Chengdu Red Earth （CRE） from the Chengdu Plain （CP）,Sichuan province,was analyzed for its elemental （major and trace elements） and isotopic （Sm-Nd） geochemistry and compared with Pleistocene loess and paleosol samples from the Chinese Loess Plateau （CLP） in Northern *** geochemical composition of CRE is similar to north China loess,and also resembles the average *** indicates that CRE,as loess deposits in Northern China,was derived from well-mixed sedimentary protoliths that have undergone numerous upper crustal recycling ***,obvious differences in the geochemical characteristics of CRE and the north China loess are also revealed in our *** chemically stable elements,CRE has higher Ti,Zr,Hf and lower ΣREE,Ba contents in comparison with loess samples from the *** analysis shows that CRE has higher TiO2/Al2O3,SiO2/Al2O3,Ba/Rb and lower Ce/Yb,Eu/Yb,LaN/YbN and ΣLREE/ ΣHREE *** Sm-Nd isotopic geochemistry,Sm and Nd content and the εNd（0） value in CRE are significantly higher than those in north China *** higher TiO2 content in CRE coincided with a high background concentration of Ti in the Sichuan Basin and the surrounding *** lower ΣREE and higher Sm,Nd,εNd（0） values are related to the wide distribution of basalt in the southwest Sichuan *** elemental and isotopic geochemistry of CRE indicates that eolian materials in the CP predominantly come from the Sichuan Basin and the surrounding regions,which differs from loess deposits in the CLP.

关键词： The Chengdu Plain Chengdu red earth eolian deposits geochemical characteristics provenance

Late Cenozoic Geology and Paleo-environment Change in the Eastern Edge of Qinghai-Xizang Plateau

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2008年第5期82卷 959-966页

作者： ZHAO Zhizhong QIAO Yansong WANG Shubing YAO Haitao WANG Yan LI Chaozhu FU Jianli liu zongxiu LI Mingze MIAO Qi JIANG Fuchu Institute of Geomechanics Chinese Academy ofGeosciences Beijing 100081 China Open Laboratory of Lake Sediment and Environment Chinese Academy of Sciences Nanjing 210008 Jiangsu China

There are late Cenozoic lacustrine deposits and loess and red clay and moraines in eastern edge of the Qinghai-Xizang Plateau. Various genetic sediments recorded rich information on late Cenozoic paleo-environment changes. Xigeda lacustrine formed during 4.2 Ma B.P.-2.6 Ma B.P. There were 9 periodic warm-cold alternations. Eolian deposition in western Sichuan began at 1.15 Ma B.P. The loess-soil sequences recorded successively 14 paleo-monsoon climate cycles. Laterite in Chengdu plain recorded 5 stages of paleoclimatic stages since 1.13 Ma B.P. There was an old glacial period of 4.3 Ma B.P. in eastern Qinghai-Xizang Plateau. During Quaternary, there are 5 extreme paleoclimatic events corresponding with 5 glaciations.

关键词： Qinghai-Xizang Plateau Xigeda lacustrine Loess in western Sichuan Chengdu laterite Quaternary glaciations

开拓创新辉煌历程——《气象学报》办刊80年的主要进展

在线全文

学校读者我要写书评

暂无评论

中国科技期刊研究 2006年第5期17卷 781-785页

作者：刘宗秀赵秀英中国气象学会<气象学报>期刊社 100081

总结回顾了《气象学报》80多年的办刊实践和体会。提出明确办刊目标,树立精品意识,争创一流期刊的设想。在发扬成绩中找差距,开拓未来,将《气象学报》办成更加具有时代与专业特色、在国内外有较大影响力的期刊。

关键词：科技期刊国际化气象学报

Diet control on carbon isotopic composition of land snail shell carbonate

在线全文

学校读者我要写书评

暂无评论

Diet control on carbon isotopic composition of land snail sh...

夏季风降水对黄土高原现生蜗牛壳体碳酸盐氧同位素组成的影响

中国科学院地质与地球物理研究所2007学术年会

作者： liu zongxiu,GU ZhaoYan~+,WU NaiQin & XU Bing Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

Carbon isotope compositions for both the carbonate shells and soft bodies(organic tissue) of living land snails collected mostly from the Loess Plateau,China have been *** result shows thatδC values range from -13.1‰to -4.3‰for the aragonite shell samples and from -26.8‰to -18.0‰for the soft body *** the shells are enriched in C relative to the bodies averagely by 14.2(±0.8)‰,the shellδC values are closely correlated to the bodyδC values,expressed asδC = 1.021δC + 14.38(R=0.965;N = 31).This relationship indicates thatδC is primarily a function of the isotopic composition of the snail diets since previous studies have proved that the snail body is the same as their food in carbon isotope *** other words,carbon isotope composition of the carbonate shell can be used as a proxy to estimate the dietary C abundance of the land *** data also support that the C enrichment of the carbonate shells results mainly from the equilibrium fractionations between the metabolic CO,HCO in the hemolymph and shell aragonite,and partially from kinetic fractionations when snail shells form during their activity.

关键词： carbon isotope land snail Loess Plateau

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

第四纪研究 2006年第4期26卷 643-648页

作者：刘宗秀顾兆炎许冰吴乃琴中国科学院地质与地球物理研究所北京100029

为了深入了解黄土地层中丰富的陆生蜗牛壳体碳酸盐化石氧同位素组成的气候环境指示意义,文章对黄土高原典型气候带的现生蜗牛壳体文石氧同位素进行了测量。结果显示:高原半干旱地区蜗牛壳体氧同位素组成相对于半湿润地区显著富集18O;壳... 详细信息

为了深入了解黄土地层中丰富的陆生蜗牛壳体碳酸盐化石氧同位素组成的气候环境指示意义,文章对黄土高原典型气候带的现生蜗牛壳体文石氧同位素进行了测量。结果显示:高原半干旱地区蜗牛壳体氧同位素组成相对于半湿润地区显著富集18O;壳体1δ8O值与夏季降水量具有密切负相关关系。对照黄土高原气候特征以及夏季风降水氧同位素组成和降水量的关系,认为:1)夏季风降水18O丰度是影响蜗牛壳体氧同位素组成变化的主要因素;2)进一步研究黄土沉积物中蜗牛壳体化石氧同位素组成对重建黄土高原夏季风强度变化的历史具有重要的意义。

关键词：氧同位素陆生蜗牛黄土高原

末次冰期黄土中蜗牛壳体碳酸盐同位素组成与其环境指示意义

在线全文

学校读者我要写书评

暂无评论

第四纪研究 2009年第1期29卷 13-22页

作者：顾兆炎刘宗秀许冰吴乃琴中国科学院地质与地球物理研究所新生代地质与环境重点实验室北京100029 中国地质科学院地质力学研究所北京100081

为了揭示蜗牛化石壳体碳酸盐（文石）稳定同位素组成的古气候和古生态环境指示意义，对采集于河南荥阳亡口山末次冰期黄土剖面上部中的粉华蜗牛（Cathaica pulveratrix）化石壳体碳酸盐进行了碳、氧稳定同位素分析，同时还对全岩有机物... 详细信息

为了揭示蜗牛化石壳体碳酸盐（文石）稳定同位素组成的古气候和古生态环境指示意义，对采集于河南荥阳亡口山末次冰期黄土剖面上部中的粉华蜗牛（Cathaica pulveratrix）化石壳体碳酸盐进行了碳、氧稳定同位素分析，同时还对全岩有机物质（SOM）碳同位素组成以及全岩磁化率和粒度等气候替代指标进行分析，结果显示：剖面中反映蜗牛食物碳同位素组成的壳体δ13CSSA的变化，与反映古植被碳同位素组成的全岩有机物质碳同位素组成（δ13CSOM）无显著的相关关系，但是壳体13C相对于SOM的富集程度（△13CSSA-SOM）的变化与石笋氧同位素记录的末次冰期东亚夏季风强度演化同步一致；壳体δ13CSSA的变化不但与黄土磁化率、粒度等气候替代指标变化具有显著相关性，同样也与末次冰期东亚夏季风强度演化同步一致。这些特征，一方面说明受季风环流控制的气候温湿程度变化左右蜗牛夏季活动的几率和食物的类型，干冷气候条件下，相对温湿夏季成为蜗牛活动主要时期，相对富集13C苔藓、菌类和植物可能是蜗牛的主要食物；另一方面暗示蜗牛化石壳体碳酸盐稳定同位素组成能够指示气候温湿程度和生态环境的变化。

关键词：陆生蜗牛化石碳氧同位素黄土

陇东新近纪红粘土与第四纪黄土地球化学特征及其物源和风化指示意义

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

地质力学学报 2021年第3期27卷 475-490页

作者：綦琳乔彦松刘宗秀王燕彭莎莎中国地质科学院地质力学研究所北京100081 新构造运动与地质灾害重点实验室北京100081 中国科学院广州地球化学研究所广东广州510640 中国地质调查局新构造与地壳稳定性研究中心北京100081

甘肃省平凉市灵台县邵寨镇剖面风尘堆积底界年龄大约为5.23 Ma B.P.,通过对该剖面新近纪红粘土与第四纪黄土-古土壤序列的常量元素、微量元素、Nd同位素的测试,分析其在物源和风化方面的指示意义,发现新近纪红粘土与第四纪黄土具有相似... 详细信息

甘肃省平凉市灵台县邵寨镇剖面风尘堆积底界年龄大约为5.23 Ma B.P.,通过对该剖面新近纪红粘土与第四纪黄土-古土壤序列的常量元素、微量元素、Nd同位素的测试,分析其在物源和风化方面的指示意义,发现新近纪红粘土与第四纪黄土具有相似的常量、微量元素UCC标准化曲线和稀土元素球粒陨石标准化曲线,指示二者皆来自广阔的物源区,经过了相似的搬运过程,并在搬运中得到充分混合。新近纪红粘土的MgO、Li、Cs、Bi含量较高,Na_(2)O、稀土元素La-Lu、Y含量较低。风化参数Na_(2)O/Al_(2)O_(3)、化学风化参数CIA以及Al_(2)O_(3)-CaO+Na_(2)O-K_(2)O(A-CN-K)图,均显示新近纪红粘土比第四纪黄土经历了更为强烈的风化过程。新近纪红粘土的稳定元素比值(TiO_(2)/Al_(2)O_(3),SiO_(2)/Al_(2)O_(3),SiO_(2)/TiO_(2),Zr/Hf,Nb/Ta,Lu/Hf,Y/Ho,Th/Nb和Hf/Nb)、稀土元素总量、轻稀土与重稀土的分异程度、轻稀土内部分异程度、重稀土内部分异程度、Ce和Eu的异常程度、同位素ε_(Nd)(0)值等,皆与第四纪黄土无太大差异,指示二者物质来源一致。粒度以及风化强度的差异,可能是导致新近纪红粘土与第四纪黄土常量和微量元素含量差异的主要原因。

关键词：风尘堆积红粘土地球化学物源黄土高原

在线全文

学校读者我要写书评

暂无评论

酵母多糖在防控畜禽疾病上的研究进展

中国动物保健 2011年第1期13卷 67-69页

作者：刘宗秀李犹平乾坤集团新兽药研究所四川温江611130 四川省新兽药工程技术研究中心四川成都611130

酵母多糖是从酵母的细胞壁中提取出来的一些大分子糖类聚合物,主要成分是葡聚糖和甘露聚糖。随着科学技术的发展,多糖的活性功能已经逐渐被人们所认识。而酵母多糖作为多糖中的一种,其研究也在不断深入研究。酵母多糖具有许多生物学活... 详细信息

酵母多糖是从酵母的细胞壁中提取出来的一些大分子糖类聚合物,主要成分是葡聚糖和甘露聚糖。随着科学技术的发展,多糖的活性功能已经逐渐被人们所认识。而酵母多糖作为多糖中的一种,其研究也在不断深入研究。酵母多糖具有许多生物学活性功能,如能吸附病原菌,增强细胞免疫力,提高巨噬细胞活性,抗辐射,抗病毒,提高抗癌功能等。本文就酵母多糖的生物学活性、免疫抗病机理及在畜禽疫病的防控上作一综述。

关键词：酵母多糖生物学活性免疫畜禽疫病防控

维普期刊数据库博看期刊