白蛾黑基啮小蜂种群数量变化规律的初步研究

选择徐州市林果场、云龙区和新沂市等受杨小舟蛾危害较重的不同类型杨树林分的未放蜂区(CK)和放蜂区,分别测定白蛾黑基啮小蜂在自然和人工释放2种状态下的种群数量变化。结果表明,该蜂林间自然种群数量以越冬代最高,对杨小舟蛾越冬蛹的寄生率高达(22.2±5.8)%,极显著高于第1~4代蛹(3.4%~6.4%);于越冬代和第2代害虫蛹期人工释放该蜂,释放后当代小蜂种群数量明显上升,可显著提高释放当代(越冬代和第2代)害虫蛹的寄生率,并对释放后各代害虫蛹具有一定的持续寄生效果;各代小蜂室温下的羽化进度均与相应世代寄主蛹发育进度相吻合。     

转基因抗虫棉sGK中3017良种繁育技术

总结归纳丰产转基因抗虫棉sGK中3017良种繁育技术.主要包括:良繁田选择、种子选择、田间管理、收获、检测等关键技术.     

应用Excel软件分析敌敌畏农药对两广二号家蚕的安全间隔期

应用Excel软件中的曲线方程分析判断敌敌畏农药对两广二号家蚕的安全间隔期。结果表明：敌敌畏1000倍液的安全间隔期是6d多，其数学模型为幂函数曲线方：y=88．0653x-1834本方法克服以往家蚕的农药安全期无数学模型可循或使用的BASIC方法陈旧繁杂的缺点，也避免英文统计软件SPSS难以在农村普及的不足，是一种计...     

HMGCR基因多态性与肉牛屠宰性状相关性分析

MHGCR是胆固醇生物合成过程中的限速酶,在内源胆固醇生物合成过程中起着重要的作用。研究以牛HMGCR基因为候选基因,采用PCR-SSCP和测序技术在利杂牛、利西杂牛、秦川牛、西杂牛和夏西杂牛五个群体共123个个体中检测遗传变异情况。结果表明,检测到AA和AB共2种基因型,没有发现BB基因型,测序分析发现一处SNP多态位点(GenBank:BC153262.1 11137TC)。不同基因型与屠宰性状的相关性分析显示,在利西杂群体中AA基因型个体与AB基因型个体相比,AA基因型个体的屠宰率和牛柳指标达到了极显著水平(P0.01),而AA基因型的上脑重显著高于AB基因型(P0.05),其余各项指标基因型间差异不显著(P0.05)。因此,HMGCR基因单核苷酸多态性对利西杂牛脂肪沉积有一定的影响,可作为影响屠宰性状的候选基因,指导肉牛的育种工作。     

谷子杂交种与常规种光合和叶绿素荧光特性的比较

为了明确杂交谷的光合优势是否是其产量高于常规谷的一大主因,本研究于2013年对常规谷晋谷21号和杂交谷张杂谷5号的光合和叶绿素荧光特性进行比较。采用完全随机设计,每个品种种植5个小区,在拔节期和灌浆期分别测定各项光合指标。结果表明,在拔节期,张杂谷5号的净光合速率、PSⅡ实际光化学量子产量显著高于晋谷21号;但在灌浆期,张杂谷5号和晋谷21号之间的总叶绿素含量、净光合速率、蒸腾速率、气孔导度、胞间CO2浓度、PSⅡ实际光化学量子产量、光化学淬灭参数和非光化学淬灭参数都存在显著差异。总体杂交谷在拔节期和灌浆期的光合性能高于常规谷。     

水分胁迫下转DREB3基因抗旱大豆的生理反应

采用田间试验方法,在苗期和初花期自然状态、水分胁迫以及充足灌水条件下,研究了转DREB3基因抗旱大豆叶片、茎、根中超氧化物歧化酶(SOD)活性,丙二醛(MDA)、脯氨酸和蔗糖含量的变化。结果表明,在自然状态下,苗期水分胁迫第5天时,转DREB3基因抗旱大豆叶片SOD活性显著高于受体大豆东农50,初花期无明显变化;苗期和初花期转DREB3基因抗旱大豆叶片、茎和根中丙二醛、脯氨酸含量与受体大豆东农50相比无明显差异;苗期转DREB3基因抗旱大豆叶片和根中蔗糖含量显著低于受体大豆东农50,初花期差异不显著。在水分胁迫条件下,转DREB3基因抗旱大豆SOD活性显著高于受体大豆东农50,丙二醛含量显著低于受体大豆东农50,初花期水分胁迫第10天时叶片和茎中脯氨酸含量显著高于受体大豆东农50,蔗糖含量显著低于受体大豆东农50。充足灌水管理下,转DREB3基因抗旱大豆与受体大豆东农50相比,苗期和初花期叶片、茎和根中SOD活性、丙二醛和脯氨酸含量无明显差异;苗期转DREB3基因抗旱大豆叶片中蔗糖含量显著低于受体大豆东农50,但在初花期水分胁迫10天时转DREB3基因抗旱大豆叶片中蔗糖含量显著高于受体大豆东农50,苗期和初花期茎和根中蔗糖含量无显著差异。     

Functional porous carbons from waste cotton fabrics for dyeing wastewater purification

A new functional porous carbons (PC-WF) is prepared by activation-pyrolysis method use waste cotton fabrics (WF) as an abundant, cheap and available precursor for removal of Brilliant Crocein (BC-GR) and Cationic Red 2GL (CR-GL) from aqueous phase. The PC-WF was characterized by BET, FTIR, SEM, and XRD techniques, the surface area, total pore volume, average pore diameter was found as 1463.5 m² g^-1, 0.783 cm³ g^-1 and 2.14 nm, respectively. The influences on BC-GR and CR-GL adsorption of various experimental factors such as initial concentration and temperature were investigated. Adsorption kinetics was found to be best represented by the pseudo-second order model. The adsorption capacity was 319.8 mg g^-1 for BC-GR and 842.5 mg g^-1 for CR-GL at 30 °C, respectively. The results indicate that for waste cotton fabrics in particular, the practical application of this process to the production of porous carbon would be possible.     

Optimum Level of Dietary n‐3 Highly Unsaturated Fatty Acids for Juvenile Sea Cucumber,Apostichopus japonicus

A feeding trial was conducted to estimate the optimum level of dietary n‐3 highly unsaturated fatty acids (HUFAs) for juvenile sea cucumber, Apostichopus japonicas, based on growth performance and fatty acid compositions. Diets with five n‐3 HUFAs levels (0.15, 0.22, 0.33, 0.38, and 0.46%) were fed to sea cucumber juveniles (1.97 ± 0.01 g) once a day for 60 d. The sea cucumbers fed diets containing 0.22% n‐3 HUFAs showed significantly (P < 0.05) higher body weight gain, feed efficiency, and protein efficiency ratio than the sea cucumbers fed diets containing 0.15% n‐3 HUFAs, but not significantly different (P > 0.05) from those of sea cucumbers fed diets containing 0.33, 0.38, and 0.46% n‐3 HUFAs. The sea cucumbers fed diets containing 0.46% n‐3 HUFAs showed significantly (P < 0.05) higher eicosapentaenoic acid and saturated fatty acid than the sea cucumber fed diets containing 0.15% n‐3 HUFAs, but not significantly different (P > 0.05) from those of sea cucumbers fed diets containing 0.22, 0.33, and 0.38% n‐3 HUFAs. The results of growth performance and n‐3 HUFA compositions of body wall indicated that the optimum level of dietary n‐3 HUFAs for juvenile sea cucumber is between 0.22 and 0.46%.