苯乙烯/甲基丙烯酸3-氯-2-羟基丙酯共聚物的合成与表征

制备了甲基丙烯酸-3-氯-2-羟基丙酯(CHPMA),采用自由基悬浮聚合的方法,使其与苯乙烯进行共聚合,首次合成了苯乙烯/-а甲基丙烯酸-3-氯-2-羟基丙酯线型无规共聚物,并用FT-IR和GPC对共聚产物进行了表征,讨论了聚合条件对产物收率的影响。结果显示该共聚物的数均分子量达到10万以上,其分子量多分散系数为1.72,有望用于极性橡胶(如氯丁橡胶等)与亲水性树脂(如聚丙烯酸、聚丙烯酰胺等)共混的增容剂以制备稳定性良好的特种功能材料——吸水膨胀橡胶。     

基于数字图书馆的生物数据库统一接口设计

为了提供最大限度的数据库互操作性,本文通过整合异质数据库的统一接口,为异构数据库和不同的数据库管理系统之间的互操作带来方便。以实现数字图书馆用户更有效地进行生物信息数据的检索与获取、综合与分析。     

Spectral Characterizations of Veronese Surface in S^4

In this paper,we prove that the Veronese surface can be determined by the 1-spectrum of the Laplace operator.     

Silicon＇s organic pool and biological cycle in moso bamboo community of Wuyishan Biosphere Reserve

Biomineralization of Si by plants into phytolith formation and precipitation of Si into clays during weathering are two important processes of silicon’s biogeochemical cycle. As a silicon-accumulating plant, the widely distributed and woody Phyllostachys heterocycla var. pubescens (moso bamboo) contributes to storing silicon by biomineralization and, thus, prevents eutrophication of nearby waterbodies through silicon’s erosion of soil particles. A study on the organic pool and biological cycle of silicon (Si) of the moso bamboo community was conducted in Wuyishan Biosphere Reserve, China. The results showed that: (1) the standing crop of the moso bamboo community was 13355.4 g/m², of which 53.61%, 45.82% and 0.56% are represented by the aboveground and belowground parts of moso bamboos, and the understory plants, respectively; (2) the annual net primary production of the community was 2887.1 g/(m²·a), among which the aboveground part, belowground part, litterfalls, and other fractions, accounted for 55.86%, 35.30%, 4.50% and 4.34%, respectively; (3) silicon concentration in stem, branch, leaf, base of stem, root, whip of bamboos, and other plants was 0.15%, 0.79%, 3.10%, 4.40%, 7.32%, 1.52% and 1.01%, respectively; (4) the total Si accumulated in the standing crop of moso bamboo community was 448.91 g/m², with 99.83% of Si of the total community stored in moso bamboo populations; (5) within moso bamboo community, the annual uptake, retention, and return of Si were 95.75, 68.43, 27.32 g/(m²·a), respectively; (6) the turnover time of Si, which is the time an average atom of Si remains in the soil before it is recycled into the trees or shrubs, was 16.4 years; (7) the enrichment ratio of Si in the moso bamboo community, which is the ratio of the mean concentration of nutrients in the net primary production to the mean concentration of nutrients in the biomass of a community, was 0.64; and lastly, (8) moso bamboo plants stored about 1.26×10¹⁰ kg of silicon in the organic pool made up by the moso bamboo forests in the subtropical area of China. Project (No. 30370275) supported by the National Natural Science Foundation of China     

生物饲料在养兔业中的应用试验

养兔具有投资少、效益高、见效快等优点.本地区的养兔业已初具规模,其品种主要以长毛兔、中国白兔为主.中国白兔具有生长速度缓慢的缺点[1],严重影响养兔业的发展.通过日喂生物饲料占精料百分比不同的饲养试验,得出添加生物饲料之后,家兔生长速度明显加快(p<0.05),当生物饲料占精料2%时效果非常显著(p<0.01),能显著加快家兔生长速度,降低饲料成本,经济效益显著;当大于或小于这一值时效果无明显差异(p>0.05);生物饲料能减轻畜禽异味和粪尿恶臭;对保持畜禽业的持续发展,缓解人畜争粮,生产绿色食品,减少环境污染具有重要意义.     

乳酸菌的筛选及生物学特性的研究

从酸奶样品中分离、筛选出5株乳酸菌,经过形态学测试及生理生化反应试验,最后确定其中2株为嗜热链球菌.     

耐热木聚糖酶源细菌筛选、鉴定及酶学性质

利用木聚糖作为唯一碳源的基础盐培养,在50℃培养条件下,从新乡周围土样及腐殖质中筛选到1株产耐热β-木聚糖酶细菌,初步鉴定为巨大芽孢杆菌（Bacillus megaterium FLH-2）.该菌株在40~55℃生长良好,最适生长温度50℃.木聚糖酶粗酶性质研究表明：该酶最适pH和最适温度分别为6.0和65℃;在pH 5.0~9.0及温度30~75℃之间酶活相对稳定,分别处理30 min,相对酶活仍保持在80%以上.     

内蒙古地区高职院校生物制药专业人才培养模式探究

目前,生物制药行业发展出现新特点,对人才培养提出新的要求,要求生物制药方向的人才不但要有丰富的理论知识,更要具备过硬的手头工夫和实战经验。这一论文对于指导高职院校生物制药专业的办学,尤其是课程建设、师资队伍建设、实验实训室建设以及教材建设具有重要的指导意义。     

铝的生物毒性作用及食品卫生

本文综述铝在人体内的代谢、生物毒性作用及其食品卫生状况。