1,6—二磷酸果糖制备研究：Ⅰ.菌种的筛选及培养条件

介绍了１,６－二磷酸果糖产生菌的筛选和最佳培养条件的确定,在所筛选的菌种中９５１８、９５１９号菌株均具较高的产１,６－二磷酸果糖酶系活力。其最佳培养条件为：培养温度２８℃,ｐＨ６．５。     

Preparation and optical properties of solid solution semiconductor (Zn x Cd1−x S) doped silica glasses

Semiconductor(Zn_xCd_1−x S) doped silica glasses were prepared by Sol-Gel process andin situ growth technique. The structure of the materials was characterized by X-ray diffraction technique, the particle size of semiconductor crystallites from X-ray patterns was estimated less than 10 nm. From absorption spectra, it is obtained that the absorption edges shifted to short wavelength direction when Zn contents increased, and the absorption edge can be adjusted from 2.46 eV to 2.96 eV by controlling Zn contents. The third-order nonlinear optical susceptibility was studied at 532 nm with 8 ns pulse laser by degenerate four wave mixing (DFWM) technique.     

Signal transduction pathways mediated by colony stimulating factor-1 receptor

Colony-stimulating factor-1 (CSF-1), which is necessary for cell proliferation and differentiation, regulates both immediate and delayed early responses throughout G1 phase. The binding of CSF-1 to its receptor (CSF-1R) triggers phosphorylation of the receptor and its intrinsic tyrosine kinase. The activated receptor binds directly to cytoplasmic effector proteins, which induce multiple-signal transduction pathways. CSF-1 can induce the c-myc gene expression via Ras and Ets-related proteins. The expression of c-fos/jun family genes is also targeted following the activation of Ras. CSF-1R activates STAT1 and STAT3 to participate in signaling, but JAKs do not appear to contribute to signaling by CSF-1R. CSF-1R activates PI3-kinase, and PI3-ki can interact with downstream proteins by the MAPKK-related pathway independent of Ras/Raf. PC-PLC can enforce signaling in response to CSF-1. Furthermore, the turnover and dephosphorylation by the phosphatase SHPTP1 of CSF-1R are the major mechanism in the negative regulation of signaling by CSF-1R     

Effects of extracellular calmodulin on pollen germination and tube growth

The effects of calmoddin (CaM) antagonist W7-agarose, anti-CaM serum and exogenous purified CaM on pollen germination and tube growth ofForsythia suspensu were studied. The pollen germination and tube growth were inhibited or completely stopped by CaM antagonist W7-agarose. The addition of exogenous purified CaM stimulated pollen germination and tube growth, whereas the same amount of bovine serum albumin (BSA) had no effect. The inhibitory effects caused by W7-agarose and anti-CaM serum could be reversed completely by the addition of exogenous purified CaM. The tube growth of germinated pollen was also inhibited or completely stopped by W7-agarose. The results suggest that endogenous extracellular CaM initiates pollen germination and tube growth, whereas exogenous CaM enhances the above processes.     

TS分子筛的催化氧化性能研究：Ⅲ.苯酚氧化制苯二酚

研究了自合成的钛硅分子筛（ＴＳ－１）对Ｈ２Ｏ２氧化苯酚制苯二酚反应的催化活性。对反应的温度、时间、催化剂用量、酚：Ｈ２Ｏ２等因素进行了考察：在催化剂用量为苯酚的１０％、酚：Ｈ２Ｏ２（ｍｏｌ）为３：１时,经５７℃／６ｈ反应,Ｈ２Ｏ２的转化率和对产物苯二酚的利用率可达９０％和８０％,还观察到,分子筛的晶粒大小对苯酚的氧化活性影响较大,大晶粒催化剂的内表面利用率较低,从而影响催化活性。     

透射焦散线法研究甲板开口边缘Ⅰ型裂纹的应力强度因子

为研究船舶甲板开口边缘受拉的Ⅰ型裂纹的应力强度因子,并探索焦散线方法在船舶结构中的应用,采用透射焦散线方法进行了实验研究．实验中模拟一般散货船带舱口的上甲板,制作了带孔有机玻璃透明试件,并采用加热法开出孔边裂纹．在数字焦散线实验系统中进行实验,获得了清晰的全场焦散线数字图象．应用焦散线图象自动处理程序精确地测出焦散线的最大直径以计算应力强度因子,并对裂纹尖端初始焦散线引起的实验误差作了处理．实验结果与理论值十分接近,表明船舶甲板开口边缘受拉的Ⅰ型裂纹的应力强度因子与甲板中的总纵拉力成正比．     

高温氧化膜Cr2O3和NiO中应力松弛过程

用Ｘ射线原位应力测定了高温氧化膜Ｃｒ２Ｏ３和ＮｉＯ中的应力．结果表明,Ｃｒ２Ｏ３／Ｃｒ和ＮｉＯ／Ｎｉ体系氧化膜的生长应力分别为－１．９４９ＧＰａ和６５２ＭＰａ．在冷却过程中,Ｃｒ２Ｏ３／Ｃｒ体系发生很大的应力松弛过程,其主要表现形式为氧化膜翘曲和开裂;而在ＮｉＯ／Ｎｉ体系中,由于ＮｉＯ薄膜具有双层结构承受不同应力状态而获得松弛．     

半平面多圆孔多裂纹反平面问题

运用复变函数及积分方程方法,求解了半平面域多圆孔多裂纹反平面问题．建立了两种类型的基本解．利用叠加原理和所得的基本解并沿圆孔和裂纹表面取待定的基本解密度函数,可得一组基本解密度函数为未知函数的Ｆｒｅｄｈｏｌｍ积分方程．通过该积分方程组的数值求解可以得到密度函数的离散值,进而得到裂纹尖端的应力强度因子．     

Endothelial Cell Culture on Different Phospholipid Surfaces *

ＩｎｔｒｏｄｕｃｔｉｏｎＢｉｏｍａｔｅｒｉａｌｓａｒｅａｌｗａｙｓｕｓｅｄｉｎａｎｅｎｖｉｒｏｎｍｅｎｔａｄｊａｃｅｎｔｔｏｌｉｖｉｎｇｔｉｓｓｕｅｓａｎｄｂｌｏｏｄ．Ｃｅｌｕｌａｒｉｎｔｅｒａｃｔｉｏｎｓｗｉｔｈｉｍｐｌａｎｔｓａｒｅｏｆｐｒｉｍａ...     

1,3—二氯—2—丙醇氧化反应的研究

对１,３－二氯－２－丙醇的氧化反应进行了系统的研究,将８４％的硫酸溶液慢慢滴加到包含有１,３－二氯－２丙醇和重铬酸钠水溶液的反应容器中去,将体系保持在２４℃～２６℃拦反应６ｈ,反应完成后,过滤回收１,３－二氯丙酮粗品,粗品用冰水洗涤,然后通过蒸馏经可获得８０．４％的收率的１,３－二氯丙酮,这是一种合成１,３－二氯丙酮较好的工艺,这种工艺与同类文献介绍的方法比较目标产物收率提高１０％,而反应时间缩短