龙葵种子萌发特性的研究

采用正交试验设计,研究5种浸种药剂(蒸馏水,0.1%水杨酸,0.01%赤霉素,0.1%硝酸钾,0.3%过氧化氢),5个浸泡时间(0,2,6,12,24 h)以及5种NaCl浓度(0,20,40,60,80 mmol·L-1)对龙葵种子萌发的影响。结果表明,浸种药剂和NaCl浓度对发芽率有显著影响(P<0.05),而浸种时间对发芽率无影响(P>0.05),影响次序为浸种药剂=NaCl浓度>浸种时间。单因素NaCl试验(NaCl浓度分别为0,20,40,60,80,100,120mmol·L-1)结果表明,发芽率随NaCl浓度升高而呈下降的趋势(P>0.05);复萌试验结果显示,龙葵种子能在NaCl溶液中保持活力,复萌率随NaCl浓度升高而呈上升的趋势(P<0.05),不同NaCl浓度处理间总发芽率无显著差异(P>0.05);龙葵种子耐盐半致死浓度介于40~60 mmol·L-1之间,耐盐极限浓度介于60~80 mmol.L-1之间。     

杉木无性系采穗母株药剂处理促萌试验

为快速扩繁增殖杉木优良无性系，应用生长素、赤霉素、细胞分裂素和ＫＭｎＯ４等化学药剂处理杉木采穗母株根颈试验，探讨促萌机理。结果表明，０．２％ＫＭｎＯ４液，１０×１０－６２．４－Ｄ和５×１０－６三十烷醇三个处理有促萌效果，萌条数量分别比对照增加４６．２％，２５．８％和１４．０％。     

马蹄金的光合生理特性及调控研究（简报）

马蹄金的光饱和点约为１１４３μｍｏｌ／（ｍ２·ｓ），光补偿点约为４３μｍｏｌ／（ｍ２·ｓ），对强光有较强的适应性。ＣＯ２补偿点约为８０×１０－６，确定其为Ｃ３植物。ＡＬ合剂处理后，使马蹄金功能叶片的光合速率增加，光合产物输出速率加快，地上部干物质增长明显     

钙试剂和温度对干酪出品率和品质的影响

探讨了钙试剂添加量和凝乳温度对干酪出品率和品质的影响。结果表明,当氯化钙的添加量为牛乳的1.6%,凝乳温度为75℃时,凝块品质最好。若干酪校正出品率提高到13.96%,则乳清中蛋白质含量降低到0.46%。     

Use of chrome azurol S reagents to evaluate siderophore production by rhizosphere bacteria

Summary Siderophores produced by rhizosphere bacteria may enhance plant growth by increasing the availability of Fe near the root or by inhibiting the colonization of roots by plant pathogens or other harmful bacteria. To examine the populations of siderophore-producing bacteria colonizing the roots of two grass species that differed in their susceptibility to Fe deficiency, we inoculated serial dilutions of root samples onto chrome azurol S (CAS) agar and several other selective and non-selective culture meida. CAS agar effectively differentiated bacteria that were capable of excreting large amounts of siderophore, but the composition of the medium limited its usefulness for ecological studies. A large proportion (71–79%) of the bacterial population that grew on a non-selective medium (tryptic soy agar) failed to grow on CAS agar, and several isolates that showed no sign of siderophore production on CAS agar produced siderophore in liquid culture. Similar populations of siderophore-producing bacteria were observed on roots of St. Augustine grass, which frequently exhibits Fe chlorosis, and bermuda grass, which does not. Roots of both grasses were colonized by bacteria that produced siderophore in vitro at concentrations ranging from 100 to 230 M. The CAS assay solution was also used to compare siderophore production by Pseudomonas fluorescens Q6, an isolate from bermuda grass, and by P. putida B 10, a plant growth-promoting pseudomonad. P. fluorescens Q6 produced 2.4 times more siderophore in vitro than P. putida B 10.     

不同酸化剂对哺乳仔猪增重效果的影响

在哺乳期分别对约×互仔猪灌服不同酸化剂，进行２５天试验。结果：灌服乳香酸组、下边酸组与对照组相比，哺乳仔猪平均日增重分别提高４２．３０％（Ｐ＜０．０１）和降低３３．２６％（Ｐ＜０．０１），经济效益分别增长３６．５０％和下降３６．４８％。     

实用灰化蒸馏─氟试剂比色法改良试验

本法简化了操作程序及蒸馏装置，依沸腾时间控制蒸馏，重复利用硫酸蒸馏样品，一次性加入混合显色剂发色。通过测定不同样品的氟含量，表明这种改良方法具有简便、高效、经济的特点，适合于各基层实验室应用。     

植酸钙的提纯及其植酸磷含量的测定

用氯化钙和碳酸钠提纯自制的粗品植酸钙,通过红外光谱和磷含量的测定,证明产品纯度高,植酸钙的总磷含量在21%~22%,符合食用植酸钙产品质量要求。浓硫酸和高氯酸消解后,用钼-锑-钪复合显色剂测定植酸钙中的磷含量,偏差不超过5%;该方法简单,操作方便,是一种可行测定方法。