多元分析法在评价桑叶质量中的应用

运用方差分析法，对桑树喷施０．１％，０．２％和０．３％硫酸锌后，其三位、五位、九位叶中１８种氨基酸含量的变化作了具体分析，并按受锌影响的大小进行排序。同时，还用主成分分析法，对桑叶质量进行分析和排序，结果表明用０．１％的硫酸锌喷施桑叶质量较好。     

四种常用鱼药对梭鲈鱼种的急性毒性实验

在常温静水条件下,用硫酸铜、高锰酸钾、晶体敌百虫和氯化钠4种常用水产药物对梭鲈(Lucioperca lucioperca L.)鱼种进行急性毒性试验,鱼种规格体长范围为2.9￣3.4 cm,平均体重0.25 g。结果表明,硫酸铜安全浓度为0.481 mg.L-1,高锰酸钾安全浓度为0.337 mg.L-1,晶体敌百虫安全浓度为0.213 mg.L-1,氯化钠浓度为980.020 mg.L-1。梭鲈鱼种对实验药物的敏感性大小依次为:晶体敌百虫>高锰酸钾>硫酸铜>氯化钠。     

SRB处理硫酸盐废水的静态试验研究

硫酸盐还原菌 SRB 处理硫酸盐废水的试验表明,厌氧环境下的硫酸盐去除率大于有氧环境下的去除率;随着反应时间的增加,溶液的 pH 值呈增加趋势;溶液的 COD/SO_4~2-比值对硫酸盐的去除率有较大影响。去除率随 COD/SO_4~2-比值的增大而增加;弱碱性(pH 值7.17左右)环境下,硫酸盐还原菌对硫酸盐的去除效果最佳;溶液中含有适当的铁离子可促进硫酸盐还原菌的生长,增加其对硫酸盐的去除率;对溶液不同时刻的碱度测试结果表明,硫酸盐还原菌还原硫酸盐的过程是一个碱度升高的过程。     

硫酸铜对海洋微藻生长的影响

初步研究了硫酸铜对海洋微藻扁藻、角刺藻、小球藻和角毛藻生长的影响。结果表明,硫酸铜抑制不同微藻生长的最低浓度具有种类特异性,在生产实际中可以利用铜的抑制作用来提高微藻的分离效果。     

微量元素对小麦产量品质的影响研究

为探究微量元素钼、锌不同施肥方式对小麦灌浆速率以及产量的影响,为生产中科学配施微量元素提供理论依据,以‘郑麦113’为试验材料,设置不同的锌肥施肥方式和钼肥的施用,分别是：CK:N15-P₂O₅10-K₂O10,底追比4:6;Z1：在N15-P₂O₅10-K₂O10(底追比4:6)基础上,底施7.5 kg/hm²的钼酸铵;Z2：在N15-P₂O₅10-K₂O10(底追比4:6)基础上,底施7.5 kg/hm²的钼酸铵和15 kg/hm²的硫酸锌;Z3：在N15-P₂O₅10-K₂O10(底追比4:6)和底施7.5 kg/hm²的钼酸铵的基础上,返青期、拔节期叶面喷施7.5 kg/hm²的硫酸锌;Z4：在N15-P     

树舌灵芝复合诱变选育漆酶高产菌株

以一株产漆酶树舌灵芝的菌丝片段为试材,利用紫外线和硫酸二乙酯逐级诱变;采用愈创木酚显色圈初筛突变菌株,并通过摇瓶复筛对优势菌株产酶能力进行验证,以期选育稳定高产漆酶菌株。结果表明:最终诱变获得一株遗传稳定的高产突变株,与原始菌株相比,漆酶活性提高63.3%,同时发酵周期缩短1 d。     

Estimation of dietary copper requirement of juvenile soft-shelled turtles, Pelodiscus sinensis

Juvenile soft-shelled turtles (Pelodiscus sinensis) were fed diets containing 10 levels (0.8, 3.0, 5.0, 7.8, 9.0, 10.9, 20.4, 41.8, 78.6, 158 mg/kg diet) of copper (Cu) for 16 weeks. Turtles fed 5.0 mg Cu/kg achieved the best growth performance and the highest hematological values among all dietary groups. Growth was reduced significantly when dietary copper exceeded 20 mg/kg. Using the broken-line model with growth and hematological parameters as the dependent variables, the dietary Cu requirement of soft-shelled turtle was estimated to be 4.4–4.8 mg Cu/kg diet. Copper, iron, zinc and selenium concentrations in turtle liver were found to be influenced by dietary Cu level. Thiobarbituric acid-reactive substances in liver tissue of turtles fed diets containing 78.6–158 mg Cu/kg were higher (P < 0.05) than those fed diets containing less copper. Furthermore, diets containing more than 20 mg Cu/kg significantly impaired growth and hematology of soft-shelled turtles, indicating the dietary Cu tolerance above the requirement may be as low as 4 fold (20 vs. 5 mg/kg). Based on the results of this study, a dietary Cu level of 4–5 mg/kg is recommended for soft-shelled turtles.     

两种药物对褶皱臂尾轮虫和两种纤毛虫的急性毒性研究

本研究采用96 h静态水试验法研究硫酸锌和三氯异氰尿酸对褶皱臂尾轮虫、海洋尾丝虫和黄色伪角毛虫的急性毒性。试验结果表明,硫酸锌对褶皱臂尾轮虫、海洋尾丝虫和黄色伪角毛虫24 h半致死质量浓度分别为4.499、1.946 mg/L和221.135 mg/L;硫酸锌对海洋尾丝虫和黄色伪角毛虫12 h半致死质量浓度分别为2.896 mg/L和334.808 mg/L;三氯异氰尿酸对褶皱臂尾轮虫、海洋尾丝虫和黄色伪角毛虫24 h半致死质量浓度分别为0.412、0.167 mg/L和1.255 mg/L,三氯异氰尿酸对海洋尾丝虫和黄色伪角毛虫12 h半致死质量浓度分别为0.519 mg/L和3.044 mg/L。褶皱臂尾轮虫、海洋尾丝虫和黄色伪角毛虫对硫酸锌和三氯异氰尿酸的耐受性顺序均为黄色伪角毛虫>褶皱臂尾轮虫>海洋尾丝虫。     

Retention behavior of size and aluminum components in handsheets prepared in rosin soap size-alum systems

Handsheets were prepared with rosin soap size and aluminum sulfate under various conditions, and the retention behavior of the rosin size and aluminum components in the handsheets was studied. Pyrolysis-gas chromatography and X-ray fluorescence analysis were used to determine the size and aluminum contents in the handsheets, respectively. When the addition level of rosin soap size varied from 0% to 4% and that of aluminum sulfate was fixed at 2%, the rosin size content increased with the increase in the size addition level, whereas aluminum and calcium contents were roughly constant. Under these conditions, handsheets prepared from fines-free pulp had aluminum contents less than those for the original beaten pulp, probably because the former pulp had a carboxyl content less than that of the latter pulp. Not only the conventional rosin retention mechanism but also mechanism proposed below must exist in the rosin soap size-alum systems. That is, some aluminum compounds originating from aluminum sulfate are adsorbed on pulp fibers immediately after the aluminum sulfate addition. These adsorbed aluminum compounds form cationic sites on pulp fibers, and free rosin acid components with anionic charges are then adsorbed onto the cationic sites of pulp fibers at the wet-end.This research was presented in part at the 46th annual meeting of the Japan Wood Research Society, Kumamoto, April 1996     

湿地松幼林主、侧枝弯曲成因及防治研究

湿地松幼林主、侧枝弯曲是由于土壤、主侧枝缺铜引起的一种生理性病害。采用喷施、根施硫酸铜及喷施硼砂加硫酸铜混合液的方法进行防治,结果表明喷施硼砂加硫酸铜混合液的防治效果达８０．５６％ ～９１．６７％ ,明显优于喷施和根施硫酸铜的防治效果。