圈养亚成体大熊猫日粮粗蛋白表观消化率的初步研究

研究了7只1.5-4.7岁的亚成体大熊猫对23种日粮粗蛋白的表观消化率（ADCP），结果为37．86％－83．70％。分析表明，对1．5－2．5岁的大熊猫，粗纤维采食量与ADCP有极显著的负相关关系（图1）；对2．5－4．7岁的大熊猫。粗纤维采食量与ADCP没有明显相关关系（表3）。对1．5－2．5岁大熊猫，随竹粗蛋白占总粗蛋白比值升高，ADCP呈下降趋势（图2）；2．5－4．7岁的大熊猫，ADCP随竹粗蛋白比例升高而呈上升趋势（图3）；不同大熊猫ADCP还有个体差异。图3表3参10     

Ecological modelling Internet resources

Internet resources are grouped into registers and sources of ecological models (6 addresses), sources of documents (7), sources of data (5), initiatives (5), societies (4), journals (4) frequently asked questions (7), extensive list of links to Web pages (4), search engines (5) and Usenet groups (10). At present, Internet resources are not replacing classical libraries but should be considered as complementary sources of information.     

Biotechnology to develop innovative syntheses using CO2

We present an overview of possible biotechnological applications for using carbon dioxide for the synthesis of chemicals. These approaches are very appealing as they contribute to the implementation of new synthetic methodologies that reduce waste and make a better use of carbon and energy. Several synthetic approaches will be considered including both the incorporation of the whole COO moiety or its reduction to other C₁ molecules. Each option will be discussed making a comparison between the natural and artificial process in order to highlight the possibility to learn from Nature and develop useful mimetic or enzymatic systems.     

大豆蛋白和屠宰废水处理工艺研究

介绍了两公司大豆蛋白废水的水质水量和性质特征,分析工程的工艺设计和调试运行状况.对大豆蛋白和屠宰废水的处理,采用混和处理的总体工艺,理论研究和运行实践表明,混和处理利于均衡生物处理营养,优化厌氧处理工艺型式及参数.污泥培养时,尽快从间歇运行变为连续运行,利于基质和污泥的混和接触,促进油脂和脂肪酸的降解,防止油和脂肪酸的积累及其抑制作用,防止油脂包覆污泥,造成污泥漂浮流失.     

Removal of lead from aqueous solutions by condensed tannin gel adsorbent

Lead has caused serious environmental pollution due to its toxicity, accumulation in food chains and persistence in nature.In this paper, lead removal from aqueous solutions was investigated using condensed tannin gel adsorbent synthesized from a natural tannin compound. It is found that the adsorption is strongly affected by pH values of aqueous solutions.Within pH range of 3.5-6,when initial lead concentration is 100 mg/L, removal efficiency is more than 90%.Adsorption equilibrium is reached within 150 minutes.The adsorption isotherm fits well with the Langmuir equation, by which the saturated adsorption uptake of 190 mg Pb^2 /g dry tannin gel adsorbent is obtained.By means of thermodynamics analysis,it is revealed that the process is exothermic and the adsorption heat is up to 38.4kJ/mol.With respect to high efficiency, moderate pH requirement and minimized second pollution, the tannin gel adsorbent exhibits a promising potential in the removal of lead from wastewater.     

对苯二甲酸复合降解生产单细胞蛋白的研究

研究通过降解对苯二甲酸的酵母和细菌的复合处理,使TA的降解率达到95%以上,并生产了单细胞蛋白。该单细胞蛋白营养价值高,经急性和遗传毒性试验表明属实际无毒类,并不具遗传毒性,是优良的单细胞蛋白。     

半导体材料生产废水中的GaAs、Ga~(3+)和Ge~(4+)对活性污泥核酸和氨基酸的影响

研究了GaAs、Ga~(3+)、Ge~(4+)、Hg~(2+)和Cr~(6+)对活性污泥脱氧核糖核酸(DNA)和核糖核酸(RNA)的影响,以及GaAs对活性污泥氨基酸的影响。结果表明,Hg~(2+)和Cr~(6+)主要使活性污泥中核酸的DNA含量减少,GaAs则主要使RNA含量减少,Ge~(4+)浓度达到300ppm/g MLSS对,无论对DNA还是RNA的合成都有较强的抑制影响。低浓度的GaAs对活性污泥氨基酸含量影响不大,而GaAs浓度达360ppm/g MLSS时则使活性污泥中氨基酸含量明显减少。     

First-trimester maternal serum schwangerschafts protein 1 (SP1) in pregnancies associated with chromosomal anomalies

The relationship between first-trimester maternal serum Schwangerschafts protein 1 (SP1) and the karyotype of the pregnancy was examined in 692 women who underwent chorionic villus biopsy at 6–12 weeks. There were 30 pregnancies with abnormal karyotypes, consisting of 14 Down's syndrome (DS), eight trisomy 18, and eight other anomalies, two of which were mosaics. The normal ranges and medians for gestation were defined from the 662 cases in which the karyotype was normal. The median SP1 (0·5 MOM) of the abnormal group was significantly lower than that of the normal group (10 MOM). This relationship was maintained for the DS pregnancies (0·4 MOM) and for anomalies other than trisomy 18 (0·43 MOM) but not trisomy 18 (1·1 MOM). It is possible that the use of SP1 as a screening test for chromosome anomalies in the first trimester could have a 43 per cent detection rate for a 5 per cent false-positive rate.     

人工合成P型沸石对NH4^＋交换特性研究

应用由粉煤灰合成的P型沸石研究对NH_4~ 交换的热力学和动力学特性。结果表明,P型沸石阳离子交换总量为264meq/100g,在其整个阳离子组成范围内对进入的NH_4~ 具有高的选择交换性,该交换过程能自发沿着正方向进行,随着温度的增高,其交换能力也增强。Na~ =NH_4~ 交换过程具有较优越的动力学特性,在16℃和32℃时,P型沸石中NH_4~ 自扩散系数分别为7.14×10~(-10)和1.12×10~(-9)cm~2·s~(-1);活化能为20.74kJ·mol~(-1);活化熵分别为-88.26和-88.71J·(mol·°K)~(-1);自由能分别为43.85和45.26kJ·mol~(-1)。