机械行业企业经营状况综合评价模型及应用

本文选定８个经济指标构成评价指标体系，运用熵技术法确定各指标在评价中的权重；理想点计算各评价企业指标向量对理想点的距离；优序数法排定各企业的总优序数，建立了机械行业企业经营状况综合定量评价决策分析模型，并把这个模型实际应用到我国六大电缆厂的经营状况评价中，了较有价值的评价结果。     

庆阳站持久高效草地农业优化模式

根据多年的技术资料和生产实际，采用线性规划法作为系统优化的基本方法，拟定了庆阳黄土高原试验站草地农业结构的优化模式。     

水稻簇矮病的研究Ⅳ:病害的发生发展和防治试验

 水稻簇矮病的两种介体中,Nephotettix cincticeps的传毒率(为45.1%)显著高于N.virescens (24.7%)。但不同虫态、龄期和性别,以及采自不同产地的同一种叶蝉,其传毒力并无显著的差异。
病害的潜育期在17~29℃下为8~44天,随温度的上升而缩短。病害的发生发展与其有效毒源(带毒虫数量)、品种抗性及外界条件有密切关系。采用抗病品种(如赤块矮3号、包胎矮、珍龙13和珍龙410等),结合测报调节播插时间,必要时辅以育秧返青阶段做好治虫防病工作,可有效控制病害的发生。     

Study on the Role of AMPK Activator in Cryopreservation of Sheep Semen

This study aimed to investigate the effects of AMPK activators metformin (Met) and acadesine (AICAR) on sheep semen cryopreservation. Firstly, Met and AICAR with different concentrations (0, 100, 200, 300, 400, 500 μmol·L^-1) were added into the frozen diluent. After freezing and thawing, the optimal concentration (400 μmol·L^-1 Met, 200 μmol·L^-1 AICAR) were selected based on sperm motility, motion performance and membrane integrity; Secondly, the collected semen was froze using different frozen diluents (control group:diluent; Met group:diluent + 400 μmol·L^-1 Met; AICAR group:diluent + 200 μmol·L^-1 AICAR). After thawing, the sperm AMPK protein expression, acrosomal enzyme activity, metabolic index, mitochondrial function and antioxidant enzyme activity were examined. The results showed that the addition of 400 μmol·L^-1 Met and 200 μmol·L^-1 AICAR could significantly improve sperm motility, motion performance and membrane integrity(P<0.05) after thawing. In 400 μmol·L^-1 Met group, the total sperm motility, acrosome integrity rate and plasma membrane integrity rate were 43.20%, 91% and 46%, respectively. Compared with the control group, the level of AMPK phosphorylation in the sperm of the Met and AICAR groups was significantly increased after thawing (P<0.05), the acrosome enzyme activity of sperm was significantly increased(P<0.05); the pyruvate level was significantly decreased (P<0.05), the lactate dehydrogenase activity, lactic acid content, and ATP content were significantly increased(P<0.05). Compared with the control group, the dilution of Met group and AICAR group was more conducive to maintain mitochondrial membrane potential (P<0.05), increase ATPase and antioxidant enzyme activity (P<0.05). The addition of appropriate concentrations of Met and AICAR could improve semen quality of cryopreservation in sheep.     

深圳市公园绿地暖季型草坪春夏季杂草的调查

对深圳地区暖季型草坪台湾草及假俭草春夏季草坪进行普查，发现春夏季草坪杂草共66种，分属22科55属，其中台湾草草坪杂草63种，假检草草坪杂草38种。阔叶杂草种类占全部杂草种类的79％。通过抽样、统计，分析了台湾草、假俭草草坪精细管理区、粗放管理区春夏季杂草的优势种和对草坪构成危害的主要杂草种类。结合秋季草坪杂草的调查，总结了深圳地区草坪杂草的发生规律。     

血耳生物学特性的研究

血耳是民间极感性趣的一种药用兼食用菌。本文从温度、湿度、pH、光线、水份、碳源、氮源、培养代料等因子对血耳菌丝生长原基分化、出耳的影响进行了生物学特性方面的研究,为开发利用血耳,进行人工栽培提供资料。     

M_9矮化中间砧段对~(32)P运转的影响

研究表明M_9中间砧段对~(32)P有明显的滞阻作用,生长期限制~(32)P上运,休眠期限制下运。中间砧段内滞存~(32)P较多,影响基砧根系的吸收,试验树全株~(32)P含量低于对照树,抑制了植株接穗部分的营养生长。     

亚硝酸分子的几何异构现象

本文用半经验分子轨道法对亚硝酸分子进行构象分析,同最小分子能量对应,平衡几何构型以顺式稳定,以E_(LUMO)和E_(HUMO)—E_(LUMO)作为得电子指标,对氧化还原稳定性来说,反式的构型大于顺式。     

水稻节水灌溉模式试验研究

以水稻非充分灌溉试验的大量实测资料为基础，分析了不同稻田水分状况对水稻主要生态环境因素的影响，讨论了节水灌溉条件下水稻的生理机制及产量形成特点，提出了水稻高产省水的合理灌溉模式。