锇(Ⅷ)-高碘酸钾-5-Br-PADAP体系催化光度法测定痕量锇

研究在氢氧化钠介质中 ,痕量锇 ( )催化高碘酸钾氧化 5 - Br- PADAP的褪色反应及其动力学条件 ,建立了测定痕量锇的新方法。在选定的最佳条件下 ,方法的灵敏度为 2 .18× 10 - 1 0 g/ m l,测定范围为 10～ 6 0 mg/ L,表观活化能为 4 5 .4 KJ/ m ol。本法用于合成矿样中锇的测定 ,结果满意     

N,N-二卤代二甲基乙内酰脲的合成及杀菌性能研究

N－N－二溴代二甲乙内酰脲及N，N－二氯二甲基乙丙酰脲是一类新型高效消毒剂，经N，N－二甲基乙内酰脲与溴或氯气进行卤代反应合成目标物二溴二甲基乙现酰脲及二氯二甲基乙丙酰脲，并对其杀菌性能进行了初步测试，实验表明100μg／L的二溴二甲在乙丙酰胺及二氯二甲基乙丙酰脲在10min内可完全杀菌金黄色葡萄球菌、绿脓杆菌、枯草杆菌和伤寒杆菌等4种病菌。     

利用硫羰基化合物合成杂环

本报道了a-硫羰基硫代甲酰胺与邻苯二胺、氨基脲、苯乙炔在磷试剂存在下的双分子自身缩合反应．结果表明它们分别生成了2-吗啉基-3-苯基喹喔啉、5-吗啉基-6幡苯基-1，2，4．三嗪-3-酮、噻吩衍生物和2，2，4，5-四取代-1，3-二硫杂环戊烯-4的衍生物等杂环化合物．     

WEB上用户口令的安全传输

主要阐述了利用MD5加密算法来保证WEB上用户口令的安全传输。首先用MD5对用户口令进行一次加密，然后再用MD5对该密文和一个随机数组成的信息进行加密，形成网络上传输的用户口令，实际上用户的原始口令没在网络上传输，从而保证了用户口令的安全。     

Neuronal growth inhibitory factor inhibits pheochromo-cytoma PC12 in vitro

Neuronal growth inhibitory factor (GIF),named Metaliothioneins-Ⅲ (MT-Ⅲ), is the first protein validated to be capable of inhibiting the growth of neurons in nervous system. We have detected the effects of recombinant GIF on the growth of neuroblastoma SY5Y and pheochromocytoma PC12 by the MTT (Thiazolyl blue) reduction assay. Recombinant GIF inhibited PC12 in vitro; the inhibitory rate was about 25% when GIF was at 100 mg/L; and the inhibitory rate was about 50% when GIF was at 300 mg/L. It is shown that PC12 could serve as a proper model for detecting neuronal growth inhibitory activity of GIF. Recombinant GIF did not inhibit neuroblastoma SY5Y in vitro, a common model of neuroma; it is also shown that GIF could not inhibit neuromata extensively. The reason for GIF inhibiting PC12 may be that PC12 have some properties of cholinergic neuron. It must play an important role in discovering the mechanism of GIF's neuronal growth inhibitory activity.``     

Transcritption regulation of soybean ribulose-l,5-bisphos-phate carboxylase small sub-unit gene by external factors

Ribulose-1,5-bisphosphate carboxylase small subunit gene (rbcS) is present with multi-gene family in plant genome. In Glycine max, the rbcS polypeptide (EC4.1.1.39) is encoded by a gene family containing 4—8 members. Three full-length rbcS cDNA clones were isolated and characterized from soybean seedlings, and both of their nucleotide and amino acid sequences showed high similarity. Differential accumulation of the rbcS mRNA was observed among roots, hypocotyls, cotyledons, epicotyls and leaves. The rbcS genes were up-regulated by various external factors such as salicylic acid (SA), salt stress and drought stress. The expression level of rbcS genes after being treated by 2.0 mmol/L SA and 0.4% NaCl, respectively, is 2.5—3.0-fold as high as that of control sample. Moreover, soybean rbcSmRNA was accumulated with diurnal variation but easily influenced by light and low temperature.     

基于Delphi的医院工资管理系统的设计与实现

~~基于Delphi的医院工资管理系统的设计与实现@刘阳$佳木斯大学口腔医学院!黑龙江佳木斯154002 @顾凌威$佳木斯大学口腔医学院!黑龙江佳木斯154002 @何春俐$佳木斯大学口腔医学院!黑龙江佳木斯154002~~~~~~     

粪产碱杆菌青霉素酰化酶在枯草芽孢杆菌中的表达优化

在5L发酵罐中进行了表达粪产碱杆菌青霉素G酰化酶的重组枯草杆菌WB600(pMA5)的发酵研究。实验表明，发酵液中的葡萄糖浓度和菌体产酶能力密切相关，维持低葡萄糖水平，可以提高枯草杆菌WB600(pMA5)青霉素G酰化酶的合成能力。采用混合碳源进行发酵，在生长阶段流加葡萄糖，并维持低浓度，在发酵12h菌体浓度达到约13．8g／L时停止流加葡萄糖，使茵体利用发酵液中的可溶性淀粉作为碳源，避免葡萄糖的代谢副产物对茵体产酶能力的抑制，青霉素G酰化酶的表达水平从原来的55u／L提高到582u／L。     

一个实时在线答疑系统的动力学模型

报道一个实时在线答疑教学系统的定量动力学模型．通过对此模型的分析，研究同步式答疑教学在远程教育中的可行性．可以预期这个模型的进一步修正和完备，将展示更加丰富的复杂行为。     

呼吸速率法评价蔗渣亚铵制浆废水的可生物处理性

废水生物处理的可行性和废水的组成情况及微生物的生活条件，有着密切的联系．论文对经物化处理后的蔗渣亚铵法制浆混合废水的可生物处理性进行了研究．针对生物需氧量／化学需氧量(BODs/CODcr)比值法的不足，采用呼吸速率法评价废水的可生物处理性，实验室工作和实际运行均表明，该废水具有较好的可生物处理性，相对于BODs/CODcr比值法而言，呼吸速率法所用的时间短，能较快得出接近实际的评价．