Effects of oriented substrates on cell morphology, the cell cycle, and the cytoskeleton in Ros 17/2.8 cells

Absence of gravity or microgravity influences the cellular functions of bone forming osteoblasts. The underlying mechanism, however, of cellular sensing and responding to the gravity vector is poorly understood. This work quantified the impact of vector-directional gravity on the biological responses of Ros 17/2.8 cells grown on upward-, downward- or edge-on-oriented substrates. Cell morphology and nuclear translocation, cell proliferation and the cell cycle, and cytoskeletal reorganization were found to vary significantly in the three orientations. All of the responses were duration-dependent. These results provide a new insight into understanding how osteoblasts respond to static vector-directional gravity.

一种新型的8路电荷灵敏前置放大器

本文介绍了一种新型专用的多路电荷灵敏前置放大器,其路数最多为八路,这种电荷灵敏前置放大器采用新的设计方案,该前放主要采用低噪声场效应晶体管和集成运算放大器构成,其等效输入噪声小于等于2.2keV。该前放具有电路结构简单、体积小、输出信号上升时间快、噪声低、稳定性好等特点。并对它的设计以及特点作了较详细的阐述。

An 8.1 Ma calcite record of Asian summer monsoon evolution on the Chinese central Loess Plateau

IEECAS SKLLQG

The influence and chronological uncertainties of the 8.2 ka cooling event on continental climate records in China

IEECAS SKLLQG

黄土高原8．1Ma以来方解石记录的夏季风演化

IEECAS SKLLQG

Pollen record from red clay sequence in the central Loess Plateau between 8.10 and 2.60 Ma

IEECAS SKLLQG

利用贺兰山北部树轮资料重建过去270年以来6-8月平均干燥指数

IEECAS SKLLQG

黄土高原陇东盆地朝那红黏土8.1～2.6 Ma的孢粉记录

IEECAS SKLLQG

~(16)O~(8+)注入小麦种子胚乳引起M_1代幼苗可溶性蛋白质的变化

通过控制单核能大小 ,将 1 6 O离子注入小麦种子胚乳 ,结果引起 M1 代幼苗可溶性蛋白质的较大变化。可溶性蛋白质电泳凝胶胶片的扫描曲线显示 :1 )在高剂量的处理中 ,有的峰消失 ;有的峰高于对照 ,中、高剂量值呈升高趋势 ;有的峰低于对照 ,中、高剂量值呈下降趋势。 2 )按分子量的大小将可溶性蛋白质分成 5个区段 ,并计算不同区段蛋白质组分的相对含量。结果表明 ,同对照相比 ,第 2区段的相对含量降低 (分子量较大区段 ) ,而第 5区段的相对含量升高 (分子量最小区段 )。 3 )同时也表明 ,低剂量效应表现异常。本文也讨论了诱变胚乳对胚作用的可能机理