【摘 要】
：
This study presents a review on palaeogeographic implications and temporal variations of glaucony coveringboth modern and ancient records.Phanerozoic glaucony preferably forms in a shelf depositional
【出 处】
：
Journal of Palaeogeography
论文部分内容阅读
This study presents a review on palaeogeographic implications and temporal variations of glaucony coveringboth modern and ancient records.Phanerozoic glaucony preferably forms in a shelf depositional setting.Deep marine conditions and low seawater temp
其他文献
【目的】研究转录调控因子Bas1p和Bas2p协同作用对重组酿酒酵母(Saccharomyces cerevisiae)胞外c AMP产生的影响,初步优化发酵培养基。【方法】通过共整合表达策略,在c AMP产生菌酿酒酵母G5中超表达Bas1p和Bas2p,摇瓶发酵实验考察了Bas1p和Bas2p协同作用对菌株生长及胞外c AMP产生的影响,进一步考察了酵母粉和蛋白胨含量及前体物腺嘌呤对菌株生长和c
Observations from multiple spacecraft show that there are energy spectral "breaks" at 1–10 Me V in some large CME-driven shocks. However, numerical models can hardly simulate this property due to high
It has been confirmed that the key source rocks of Qiongdongnan Basin are associated with the Yacheng Formation, which was deposited in a transitional marine-continental environment. Because the distr
目的:通过对川东北农村地区无偿献血认知的调查,了解川东北地区农村人群对无偿献血的看法与原因,为解决献血不足问题提供思路,以及一些意见与建议。让更多人了解献血,并积极参与献血。方法:采用整体随机抽样进行问卷调查。结果:对于无偿献血认知度的调查选项分为"不知道"、"知道一点"、"了解全面",年龄从1 8-5 5及其以上。
Objective: To identify the effects of the consumption of non-nutritive sweeteners on memory retention and on the histology of the hippocampus.Methods: In this study, 20 mice were used to determine if
1引言在1994年P.Pattero和U.Tapper对正矩阵分解研究的文章中最早涉及非负矩阵分解(Non-negative Matrix Factorization,NMF)[1].在1999年著名杂志《Nature》刊登了两位科学家D.D.Lee和H.S.Seung对非负矩阵研究的突出成果[2],该文正式提出了NMF这种新的矩阵分解.该文的发表迅速引起了各领域中的科学研究人员的重视:一方面,科
植物miRNAs是广泛分布于植物基因组的非编码小分子RNA,主要在转录后通过介导靶mRNA降解或翻译抑制来调控基因的表达水平,从而影响植物器官发生和发育。该研究综述了植物miRNA生物发生过程及其作用机制,并重点阐述了miRNAs在植物器官发育的作用,以期为尽快全面揭示植物器官发育调控机理提供理论依据。
The palaeogeographic map is a graphic representation of physical geographical characteristics in geological history periods and human history periods.It is the most important result of palaeogeographi
This paper reassesses published interpretation that beef and cone-in-cone(B-CIC) fibrous calcite cements were precipitated contemporaneously just below the sea floor in unconsolidated sediment,in lime