浅析油稻轮作双免栽培模式下直播稻田杂草群落演替及综合治理策略

随着油稻轮作双免栽培模式的长期推广与应用,稻田耕作制度、栽培方式、水分管理、田间温室效应发生了相应的变化,稻田杂草害日益突出,草相更加复杂,稻田杂草的优势种群和群落演替较快,现已成为免耕直播稻生产上的一大灾害。针对油稻轮作双免栽培模式下直播稻田杂草种群的变化特点、发生演替的原因及杂草发生的态势作了具体分析,并提出了合理的治理策略。     

光强对温室盆栽茶梅形态建成的影响

研究了不同程度遮光处理(0%、25%、50%)对温室盆栽茶梅植株形态建成的影响。结果表明:不同光强下,茶梅植株形态建成的指标有所不同。遮光的茶梅各形态指标均比对照减少,对照的花头观赏品质明显优于处理。由此可见,过度遮光不利于其生长发育。     

中国超细毛羊（甘肃型）胎儿皮肤毛囊发育及其形态结构

【目的】探究中国超细毛羊（甘肃型）毛囊的组织结构与毛囊形态发生过程,为超细毛羊毛囊发育的分子调控机制研究奠定组织学基础。【方法】采用冰冻组织切片技术制作横切、纵切切片,在显微镜下观测照相。【结果】中国超细毛羊（甘肃型）毛囊结构包括连接组织鞘、外根鞘、内根鞘、毛干和毛球部。在胎龄87 d时初级毛囊发生形成毛芽,在初级毛囊基底部可见次级毛囊的囊泡结构。胎龄102 d时次级毛囊开始再分化。到胎龄138 d时,初级毛囊基本发育成熟。胎龄87—147 d,初级毛囊密度随胎龄增长逐渐降低,次级毛囊密度随胎龄增长逐渐升高,在胎龄102—117 d时次级毛囊增长迅速,在胎龄117 d时达到最大值（232.8±12.44）个/mm2,胎龄126 d时次级毛囊/初级毛囊比值达到最大值9.96。【结论】在胎龄84 d时初级毛囊开始发生,胎龄87 d时次级毛囊开始发生,胎龄102 d时在原始次级毛囊颈部隆突部开始再分化出再分化次级毛囊,胎龄108 d时原始次级毛囊大量再分化,胎龄 138 d时大部分初级毛囊和部分次级毛囊发育成熟;次级毛囊再分化是影响毛囊密度的最主要因素,它能有效地增加毛囊密度,提高羊毛细度。     

Effect of Planting Method on Grain Quality and Nutrient Utilization for No-Tillage Rice

Field experiments were conducted over 2 years using six rice (Oryza Sativa L.) cultivars to investigate the effect of two planting methods, transplanting (TP) and direct sowing (DS), on grain quality and nutrient utilization. Brown and head rice percentages, grain width, amylase, and protein content were greater in TP than in DS, whereas the opposite effect was found for chalkiness rate, gel consistency, and alkali spread value (ASV). Dramatic differences were also found between the two planting methods for nutrient harvest index and utilization efficiency, with TP having greater phosphorus (P) and potassium (K) harvest indexes, nitrogen (N) and K utilization efficiencies, and lower N harvest index and P utilization efficiency than DS. Moreover, significant differences between these genotypes could be found for both nutrient harvest index and utilization efficiency. The correlation analysis showed that rice chalkiness, transparency, gel consistency, amylose, and protein contents were all significantly correlated with N, P, and K nutrient traits. In addition, significant interactions between rice cultivar and planting methods for both rice quality and nutrient traits were also found.     

PCR-ELISA法对大豆品种的转基因定性检测研究

以共价交联在PCR管壁上的寡核苷酸作为固相引物进行PCR扩增,对PCR扩增的固相和液相产物分别进行杂交和凝胶电泳检测的PCR-ELISA法,对黑龙江省常规选育品种合丰35和黑农37、外源DNA直接导入大豆的分子育种所获品种黑生101、及大连进口的美国2号等大豆,进行转基因定性检测.结果表明:该方法高效可靠,可作为一种快速定性检测转基因产品的方法;检测结果:美国2号为转基因大豆,黑生101、合丰35和黑农37为非转基因大豆.上述结果对分子育种、生态保护、安全监测及对建立黑龙江省非转基因大豆生产保护区等具有重要意义.     

Study on the strength retention of technical cord yarn

This research studies the factors which influence the tensile strength of tire cords. Five yarn samples are made by changing the spinning conditions and viscosity to get various physical properties. Different twisting methods are introduced and the yarns are twisted under different processing conditions for each twisting process. With the experimental results, various analyses are performed to find the important factors in retaining strength after the twisting process. SEM and optical microscopic photographs are taken along with some measurements to assist the analysis.     

基于Direct 3D技术的驾驶员应激仿真系统的研究

本文提出了基于Direct 3D技术构建的驾驶员应激训练系统,它根据虚拟现实技术和动画原理,利用Direct3D所提供的先进功能来完成应激场景的生成和显示,构建比较逼真的仿真训练场景,实现驾驶员与应激场景的交互,以达到驾驶员应激训练的目的.     

Evaluation of new metallized direct dyes for mutagenicity using the Salmonella mammalian mutagenicity assay

A series of new metallized direct dyes based on benzidine congeners, 2,2′-dimethyl-5,5′-dipropoxybenzidine and 5,5′-dipropoxybenzidine, were evaluated for mutagenicity in Salmonella typhimurium strains TA98 and TA100. All of the dyes examined were judged to be non-mutagenic with and without metabolic activation while toxicity was seen in some dyes at high doses. The study also suggested that the standard Salmonella mutagenicity plate-incorporated assay was an excellent method for evaluation of dyes for mutagenicity.     

酱油中的氯化钠测定的能力验证结果与分析

[目的]通过参加酱油中的氯化钠测定能力验证,进一步总结经验,提高实验室检测水平.[方法]比较《酱油卫生标准的分析方法》(GB/T 5009.39-2003)中直接沉淀法和《食品中氯化钠的测定》(GB/T 12457-2008)中电位滴定法的优缺点,选择直接沉淀法进行检测.[结果]样品中氯化钠含量为184.0 g/L,实验室间Z比分数为0.66,能力验证结果为满意.[结论]在此次酱油中的氯化钠能力验证中,通过对方法的比较进行实验室内部质量控制,严格按照方法操作,控制取样等关键点,获得满意结果.     

平铺镇水稻直播栽培技术的探讨

平铺镇是水稻种植大镇,水稻直播技术被越来越多的农民采用,但种植技术参差不齐,倒伏情况普遍存在,导致产量下滑,对此提出了在生产管理过程中的具体意见及应对措施。