酵母细胞膜透性变化对发酵油莎豆粕制乙醇的影响

研究发现,通过在发酵培养基中添加0.8mmol/L棕榈酸可将燃料乙醇产量提高12.7%.生长在培养基中分别添加棕榈酸、亚油酸和不添加任何脂肪酸的菌体经过18%(v/v)乙醇冲击7h,酵母存活率分别为39%、5%和0%.生长于不同脂肪酸条件下酵母的细胞膜富含各自所添加的脂肪酸.菌体生长曲线表明在稳定期,生长于添加棕榈酸条件下的菌体的细胞浓度最大.菌体膜透性由大到小排列顺序为:不添加脂肪酸、添加亚油酸、添加棕榈酸;这与菌体乙醇耐性由弱到强的顺序完全一致,这说明菌体乙醇耐性的提高与细胞膜透性维持较低水平存在密切联系.从乙醇生成动力学模型参数分析可知:随着菌体乙醇耐性的增强,细胞的生长速率和细胞浓度对产物生成速率的贡献也在逐渐加强,这说明在发酵培养基中添加棕榈酸对于缩短发酵周期是有可能的.     

ERP沙盘改革管理信息系统课程的研究

管理信息系统是很多专业的核心课程,但由于内容庞杂,概念抽象,学生学习和理解有一定困难,利用这几年兴起的企业经营模拟沙盘培训对这门课程进行改革,在管理信息系统课程的不同阶段,加入企业经营模拟沙盘培训内客,使这门课程变得生动有趣且易于理解.     

Distributed modeling of the beginning and ending dates and durations of limited temperatures over the rugged terrain of Chongqing

A physically based empirical model was established for the beginning and ending dates (BED) of limited temperatures.Data used were daily mean temperatures from 34 conventional stations in the Chongqing region,measured from 1961 to 2000.Using this model in combination with the distributed modeling results of monthly mean temperatures,we developed a method for creating a distributed simulation of the BED and durations of limited temperatures in the rugged terrain of Chongqing.Spatial distribution maps were generated at a resolution of 100×100 m for the BED and durations of the limited temperatures of 0,10,15 and 20.Simulations suggest that the distributed model is able to successfully reveal the macroscopic trends and local distributions.For the modeled BED,the mean absolute bias error is 0.6-2.4 d.Cross-validation and case-year tests show mean absolute bias errors of 1.3-2.8 d and 0.7-2.5 d,respectively.Comparison shows that the simulation results are consistent with the field investigations.This implies that the simulations are as good as observations,thus providing a viable technique for simulating mountainous heat resources using conventional meteorological data.     

国有企业人力资源管理中存在的问题及对策

21世纪人力资源管理面临着越来越大的挑战,现在国有企业人力资源管理中存在一些问题,如：人力资源管理意识淡薄、领导重视不够等,针对这些问题提出对策,加强国有企业人力资源管理,提高管理水平。     

汤旺河干流水电站规划二氧化硫减排量的分析和计算

开发水电资源,可以替代火电,减少二氧化硫的排放量,为节能减排做出积极地贡献．根据汤旺河干流水电规划,尝试对规划实施后替代的二氧化硫减排量进行分析和计算．     

松花江水污染模型的数值研究

研究参考文献[4]中干支流水系统所建立的反应扩散方程组.使用傅里叶级数方法,在不同条件下对此方程组的解进行数值模拟.     

Banach空间一类非线性算子方程的不动点

利用锥理论和非对称迭代方法,讨论了不具有连续性和紧性条件的非线性算子方程A（x,x）＋u0=Bx解的存在唯一性,并给出了迭代序列收敛于解的误差估计,所得结果是某些已知结果本质改进和推广．     

一类半线性椭圆方程组非平凡解的不存在性

一类半线性椭圆方程组：{△u（x）＋f1（u（x））g1（v（x））=0 x∈Ω △v（x）＋f2（u（x））g2（v（x））=0 x∈Ω u（x）＋v（x）=0 x∈aΩ其中,Ω R^N是关于0的星形区域f1、f2、g1、g2：R→R＋为非负函数．在一定条件下,它的非平凡解是不存在的．     

年龄和怀卵对鳄蜥选择体温及静止代谢率的影响

2008年8～9月在广东罗坑自然保护区,对大竹园管护站和鳄蜥研究中心的部分人工饲养鳄蜥Shinisaurus crocodilurus进行选择体温和静止代谢率的测定,实验鳄蜥共分为一龄幼蜥组、二龄幼蜥组、三龄亚成体蜥组、成年雄蜥组、非怀孕成年雌蜥组和怀孕雌蜥组6组.结果表明:怀孕雌蜥、一龄幼蜥和二龄幼蜥的选择体温和静止代谢率均显著高于三龄亚成体蜥、成年雄蜥和非怀孕成年雌蜥,而三龄亚成体蜥、成年雄蜥和非怀孕成年雌蜥间的选择体温和静止代谢差异不显著.从选择体温和静止代谢率的年龄差异推测幼蜥发育成熟的时间跨度约为3年.建议在饲养怀卵雌体及幼体鳄蜥时,应注意保持适宜的热环境.     

Research on catalysis of sodium-metallochlorophylls in Ni/MH battery

The effects of sodium-metallochlorophylls including sodium-iron chlorophyllin, sodium-copper chlorophyllin and sodium-magnesium chlorophyllin on performance of Ni/MH battery were investigated. The results show that sodium-iron chlorophyllin can effectively activate the gases produced during charge in Ni/MH battery, therefore reducing the reduction potential of oxygen and the oxidation potential of hydrogen, and the increased speed of inner pressure of battery is decreased significantly. With the aid of DMol3 software, the activation process of oxygen and hydrogen by sodiummetallochlorophylls was simulated and analyzed. It was found that the catalysis behavior is in agreement with the experimental results, and the activation process also gets a reasonable explanation from the calculated results.