大豆专用肥对轮作,连作大豆叶片超微结构的影响

本文通过透射电镜观察了常规施肥与施用大豆专用复肥对轮作。连作大豆叶片超微结构的影响。结果发现，大豆连作导致叶绿体基粒片层结构破坏，淀粉粒积累，基粒片层结构出现“空隙区”。与常规施肥相比，施用复肥增强了轮作，连作大豆叶片叶绿体基粒片层结构的完整性，增加了基粒数量和基粒片层数，为促进大豆叶片的光合作用创造了条件，相关分析表明，叶绿体基粒片层数与大豆植株营养生长呈显著正相关。     

阿拉尔片区部分豆制品卫生学评价

本实验是以阿拉尔片区部分豆制品卫生质量进行感观和细菌学评价,为消费者的健康饮食做以指导。结果显示:阿拉尔片区所售的部分豆制品存在着卫生质量问题,菌落总数不合格的为44%;大肠菌群数不合格的为25%;九团检样豆腐中检出一例蜡样芽胞杆菌,阿拉尔片区部分豆制品总体合格率占检样的56%。     

叶用莴苣耐热品种筛选

为快速、有效地筛选出耐热优质叶用莴苣品种,实现夏季耐热栽培,搜集国内外36个叶用莴苣品种进行人工模拟高温栽培试验,测定各品种的热害指数、根系活力、叶片相对电导率及氧自由基含量等指标。初步筛选出卡斯特奶油生菜、苦细叶、西班牙、双子结球生菜、美国结球生菜等5个较耐高温叶用莴苣品种。     

PEG处理对提高一串红种子活力的研究

本文以优，中，劣三个活力不等的一串红种子为材料，研究了PEG不同浓度和不同处理时间对种子发芽率的影响，结果表明，（1）PEG可明显改善中，低活力种子细胞膜透性，显著提高种子发芽率；（2）劣质一串红种子，用25%PEG处理1天或10%处理4天，其发芽率比对照提高16.12倍，19.2倍，中等活力一串红种子用10%PEG处理1天较佳；而优良种子经过处理，反而效果不好。     

Cytogenetics and morphology of the pentaploid hybrid between Brassica napus and Orychophragmus violaceus and its progeny

A pentaploid hybrid plant (2n= 50, AACCO) between Brassica napus (AACC) and Orychophragmus violaceus (OO) showed matroclinous morphology and some patroclinous characters. Cloned progenies were mixoploid, consisting of various cells with 38–53 chromosomes, half of the cells with 50 chromosomes. The 50 chromosomes were mainly paired as 25 bivalents and segregated as 25:25 or 22:28; many other segregations were observed in some cells. Progenies produced by selfing had 38–47 chromosomes. Plants with 38 chromosomes were cytologically stable; in all other plants the chromosome number of individual cells varied between the genotype-specific maximum number and 38, indicating loss of chromosomes during mitosis. The mixoploid plants with 44 chromosomes mainly produced two kinds of mixoploid progenies with 44 and 41 chromosomes, respectively. All plants with 2n= 38 had the same morphology as the parental B. napus and were normal in fertility. These chromosome pairings and segregations in the pentaploid and its progeny support the hypothesis that O. violaceus is a natural polyploid species with a basic chromosome number of 3.     

PAYING ATTENTION TO USE SIMPLEX METHOD FOR OPTIMAL MULTIPARAMETER IN THE DESIGN OF CONTROL SYSTEM

In the design of control system using simplex method for optimal multi-parameter,if the difference in number between the greatest and the smallestparameters is very great,the optimization process converges very slowly.Evenoptimal parameters can't be found at all.This paper studies the problem,analyses its cause and poses a resolution means.A testing example shows thatthis means can solve the above problem well.     

小麦二系混合种的产量优势及其成员品种的生态组合力研究

利用3个耐盐小麦品种和4个普通丰产品种,按不完全双列混配法等量混配成12个二系混合种,在花碱地上研究了小麦二系混舍种的混合优势及其7个成员品种的生态组合力。结果表明,小麦二系混合种的混合优势普遍存在,且组合间的混合优势差异显著,平均优势幅度为—4.5％～20％,超亲优势为—12.3％～16.8％;生态组合力分析表明,成员品种间生态组合力差异显著,同一成员品种在不同的环境中生态组合力表现亦有差异。因此,在混配小麦二系混合种时,应选择生态组合力好的成员品种进行混配,这样会选出混合优势强的高产二系混合种。     

泛议种子市场品种争夺战

最近几年，玉米种子市场静悄悄地发生着变化，种业老板从热衷于套购品牌种子到争夺育成品种；又从争夺品种发展到“挖墙脚”招聘育种人员，有的老板则着手建立长期的科研育种实体。这既是中国种业改革发展必然经历的一个实践过程，也是缺乏战略眼光的种业老板在思想认识上一个艰苦的和逐步成熟的过程。     

乳蛋白生物活性肽的来源及其生理重要性

乳蛋白经酶解产生的肽类除了具有营养作用外,还具有多种生物活性,包括阿片肽、阿片拮抗肽活性及免疫调节、抗高血压、抗血栓、抗菌、促进矿质元素吸收等活性.综述了这些活性肽在体内、体外及通过微生物作用的产生情况,并对其生理重要性进行了简要论述.