鸟苷酸交换因子；
背景与目的：间隙连接在细胞间的营养物质、离子和细胞调节因子的交换中起重要作用。
Background and Objective: the gap junction plays an important role in the exchange of nutrients, ions, and regulatory molecules between cells.
其中采用了电子与离子系统的LS耦合表象，考虑了交换效应，仔细处理了碰撞矩阵元的角部分因子。
The LS coupling representation of electron -ion system is used, the exchange effect is taken into account and the angular factors of collision matrix elements are treated in detail.
用高速离心、分段盐析、亲和层析、超滤和阴离子交换层析法，从牛胎盘中分离纯化出一种肝细胞生长因子。
A kind of hepatocyte growth factor was purified from cow placenta through high speed centrifugation, salting out, affinity chromatography, ultrafiltration and anion exchange chromatography.
刻画了在非负无零因子交换半环上强保持可逆矩阵的线性算子。
The linear operators that strongly preserve invertible matrices over some antinegative commutative semirings with no zero divisors were characterized.
防风效能、乱流交换强度、土壤湿度是决定降尘量大小的主要因子。
Wind-protection effect, turbulivity and soil moisture are the main factor which determine the falling dust capacity.
结论罗红霉素能改善大鼠急性肺损伤时气体交换能力，调节肺部细胞因子，对内毒素诱导的急性肺损伤有保护作用。
CONCLUSION Roxithromycin has a protective effect on rat acute lung injury induced by LPS through regulating cytokines, improving gas exchange ability, and inhibiting lung permeability.
刻画了在非负无零因子交换半环上强保持可逆矩阵的线性算子。
Then T is an invertible linear operator preserving rank - partial ordering on Sn(F) if and only if there exists an invertible matrix (F) such that where .
刻画了在非负无零因子交换半环上强保持可逆矩阵的线性算子。
Then T is an invertible linear operator preserving rank - partial ordering on Sn(F) if and only if there exists an invertible matrix (F) such that where .
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