Mobile Police Information System Based on Web Services

Introduction The rapid developments in information technology (IT), particularly in wireless communication and web services technologies, are substantially changing the landscape of organizational communications. Wireless communication technologies enable…     

Two-Component Signal Transduction Systems in the Cyanobacterium Synechocystis sp. PCC 6803

Introduction Rapid adaptation to environmental challenges is vitally important for bacterial survival and growth. One way in which bacteria control their response to changing environmental conditions is through the mechanism of two-component signal transd…     

Effects of stem structure and cell wall components on bending strength in wheat

Stem is an important organ consisting of storage, transportation and mechanical tissues and is closely related to yield. There is an irregular cavity in the ce- real crop stems and the lower the location, the shorter and thicker the walls of the internode…     

Experimental studies on interaction of water mist with class K fires

Interaction of water mist with cooking oil fires is studied experimentally and theoretically. A LDV/APV system is used to measure the velocity and diameter of water mist at different pressures in the experiments,and the effect of water mist velocity and diameter on fire extinguishment efficiency is investi-gated. The experimental results show that water mist has excellent surface cooling effect; it can control and extinguish cooking oil fires quickly without re-ignition. The critical temperature (Tfo) is calculated by energy balance equation,and the fire plume momentum is calculated and compared with that of water mist in order to determine the critical velocity (νwy) of fire extinguishment. This paper provides references for cooking oil fires extinguishment with water mist.     

乳酸菌的分离和鉴定及其1,3-PDO的活性测定

从红原取样的酸奶中分离出7株乳酸菌,根据《伯杰氏细菌鉴定手册》和《乳酸细菌分类鉴定及实验方法》,依据细菌的菌落特征、菌体形态、生理生化特性初步鉴定这7株乳酸菌分别属于乳球菌属,链球菌属,乳杆菌属.并且通过1,3-丙二醇氧化还原酶活性检测,发现其中一株具有活性.     

无机盐丙烯酸类聚合物复合防结块的研究

以马来酸酐和丙烯酸为单体,过硫酸钾为引发剂,合成马来酸酐丙烯酸的共聚物,然后在它们的共聚物中加入无机盐,复配制成肥料防结块剂。结果表明最佳优化工艺条件为:丙烯酸和顺酐的摩尔比为1:2;引发剂用量为4%;反应温度为80℃—85℃;反应时间为3h;固含量设计为35%左右,其防结块效果与聚丙烯酸钠的同类产品对比更佳。     

紫苏乙醇提取物抗氧化活性研究

以乙醇为溶剂,从紫苏中提取有效成分,采用微生物活性纸片法和烘箱法对紫苏乙醇提取物的抗氧化活性进行研究。结果表明,紫苏乙醇提取物具有较强的抗氧化性,且对油脂食品具有较好的保护作用。     

PdH2和YH2分子结构与分子光谱

使用钯和钇原子相对论有效原子实势SDD和密度泛函理论B3LYP方法对PdH2和YH2分子结构与分子光谱进行理论研究.结果表明PdH2分子基态为角形C2v结构,基态电子态为1A1,平衡几何为RPd-H=0.169 3 nm,∠HPdH=29.3°,YH2分子基态为角形C2v结构,基态电子态为2A1,平衡几何为RY-H=0.196 2 nm,∠HYH=114.3°.同时计算给出各种稳定结构的振动频率,红外强度,拉曼活性与退极化率和偶极矩.     

苦荞黄酮对大鼠脑缺血再灌注损伤的保护作用

将Wistar大鼠随机分为5组，分别为假手术组（Sham）、缺血再灌注组（I／R）、苦荞黄酮小剂量组、苦荞黄酮大剂量和芦丁组．手术前30min腹腔注射给药，采用线栓法结扎大鼠双侧颈总动脉，制备脑缺血再灌注损伤模型，缺血30min，再灌注90min．然后断头取脑，测定脑匀浆中各种丙二醛（MDA）、乳酸脱氢酶（LDH）、一氧化氮（NO）和超氧化物歧化酶（SOD）．I／R组，脑组织中MDA、LDH、NO较sham组明显增高，而SOD较Sham组降低．苦荞黄酮大小剂量和芦丁均能降低脑组织中MDA、LDH、NO含量，但对SOD活力影响均不明显．结果说明苦养黄酮可能通过抗自由基和减轻NO介导的神经毒性来发挥对脑缺血再灌注损伤的保护作用，为进一步开发和利用苦养奠定了理论基础．     

卧龙圈养雌性大熊猫发情行为观察

通过去年和今年对卧龙圈养雌性大熊猫发情行为观察，总结了大熊猫在发情阶段各个时期的行为特征。在各个年龄存在一定的差异．结果表明：青年大熊猫的发情时间为：14-18d；中年大熊猫的发情时间为：12-16d：高龄大熊猫的发情时间为：9-13d．结合尿中雌酮的变化判断最佳的配种时间，以保证能够配种的雄性大熊猫的精液品质，同时减少了为雌性没有达到发情高潮时期交配的打斗，避免意外发生．