地被菊花粉萌发及花粉活力的研究

用ME的盐类和维生素附加16％聚乙二醇4000(PEG4000)和15％蔗糖对野菊及新红、塞旗红、玫瑰红的花粉进行培养。结果表明，萌发率分别为80．2％、85．3％、61．3％和46．5％。PE‰对菊花萌发有明显促进作用。但庶糖的作用不能被PEG所取代。菊花花粉萌发较合适的温度为10-20℃，在4-8℃时，萌发率及速度迅速降低，35℃萌发虽快。但花粉管短且破裂。在4℃条件下花粉可贮藏4-14d。但不宜干燥贮藏。     

Evaluation of Five Most Commonly Grown Cotton Cultivars (Gossypium hirsutum L.) Under Mediterranean Conditions: Productivity and Fibre Quality

Studies were conducted in four regions of central Greece (Larisa, Karditsa, Livadia, Thiva), to evaluate the productivity and fibre properties (fibre strength and fibre length) of the five most commonly grown cotton cultivars in these regions. The experiments lasted for 6 years (1995–2000). All the characteristics tested were strongly influenced by the factors ‘year’, ‘cultivar’ and ‘region’. Significant cultivar × region, year × cultivar, region × year and cultivar × region × year interactions occurred for all the characteristics studied. The cultivar Alegria had the highest seed‐cotton and lint yield, while Aria had the lowest ones. Both cultivars gave the highest mean lint percentage but the lowest mean boll weight (MBW). Alegria had the lowest fibre strength, while Aria had the highest. The Acala‐type cultivars, Acala SJ2 and Zeta 2, had intermediate seed‐cotton and lint yield, while Vered 171 had high seed‐cotton and satisfactory lint yield. The three cultivars mentioned above had the highest MBW and very good fibre strength. Positive correlation was observed between fibre strength and length. In spite of the fact that mean fibre length was statistically the same in all cultivars, it was influenced by the factor ‘year’, as a result of different weather conditions. The year 1996 was the most unfavourable one for seed‐cotton yield and MBW, because it was characterized by lower than average air temperatures and rather dry conditions for all study sites. The factor ‘region’, a combination of different climatic conditions and cultural practices, influenced significantly all the parameters studied.     

花粉多糖注射剂质量标准中几个项目测定

根据中国药典对注射剂的要求,对花粉多糖的蛋白质、鞣质、树脂、草酸盐、炽灼残渣、钾离子、砷盐、重金属含量进行测定,均符合规定,达到质量标准。     

马来西亚的油棕（Elaeis huneesis）花粉营养成分研究

对马来西亚油棕花粉进行了蛋白质、氨基酸、游离氨基酸、还原糖、蔗糖、粗脂肪、磷脂、维生素C、维生素E、类胡萝卜素、黄酮类、多糖、多肽以及矿物元素的测试和研究,结果表明油棕花粉营养成分丰富而全面,且具特色,很有利用价值。     

超早强大体积混凝土的温控防裂

论述了对大体积混凝土的原材料,通过优化配合比设计、提高混凝土设计等级、选用适当外加剂、增设导流管等技术措施和先进的施工工艺,并结合测温加强养护,可以解决大体积混凝土施工中的温度裂缝问题。     

达乌里胡枝子花粉萌发特性研究

为揭示达乌里胡枝子(Lespedeza daurica)花粉的育性并为其花粉活力检测提供一种高效方法,本试验以达乌里胡枝子新鲜花粉为试验材料,采用液体培养基,研究了蔗糖、硼酸、氯化钙浓度、采样时间、温度、光照和培养时间等因素对花粉离体萌发和花粉管生长的影响.试验结果表明:单因素试验中,适宜花粉萌发的培养基配方为20 g...     

EMS诱变玉米自交系郑58后代变异分析及应用评价

种子是农业的“芯片”,是保障粮食安全的根本,农业种质资源又被称为“种业芯片”。因此,引进、创制和丰富种质资源是攻克“卡脖子”技术的关键,通过人工诱变是种质资源创新的一个重要途径。利用0.67 mg/L EMS诱变玉米自交系郑58花粉,构建1 650个株系的玉米突变体库,从M₂和M₃后代筛选到包括生育期、株型、叶型、穗型、粒型、叶色、轴色、育性等多个农艺性状突变体,表型变异率约为9.6%。结果表明,具有育种应用潜能的代表性材料有Z330、Z641和Z1433等,可供用于选育矮秆、低穗位、耐密植、抗倒伏型新品种;Z636、Z848和Z930等新种质材料可用于测配或改良玉米穗型、粒型、轴色、粒色及品质性状。     

基于点云数据的NURBS曲面重建研究

提出一种基于点云数据的NURBS曲面重建方法,针对数据点的分布不均匀性,进行非均匀B样条曲线控制点的反算,通过累积弦长法构造非均匀节点矢量,保证了曲面的插值精度和曲面重建的质量。     

入侵害虫芒果壮铗普瘿蚊对5种芒果挥发物的电生理反应和行为选择

芒果壮铗普瘿蚊（Procontarinia robusta）是我国外来危险性入侵害虫,坚硬的瘿壳导致药剂防治困难。植食性昆虫主要通过触角接收植物挥发物选择寄主,本研究采用触角电位联用仪（EAG）和“Y”型嗅觉仪观察瘿蚊成虫对芒果叶片挥发物成分（α-蒎烯、3-莰烯、α-石竹烯、异松油烯、乙酸乙酯）的电生理反应和行为选择,结果显示：EAG反应值大小排序依次为α-蒎烯>3-莰烯>α-石竹烯>异松油烯>乙酸乙酯,α-蒎烯处理组显著高于其他挥发物。虽然雌虫对于α-蒎烯、3-莰烯、α-石竹烯3种物质的EAG反应值比雄虫的高,但是雌雄之间对同一挥发物差异不显著（P<0.05）。行为选择结果显示：对瘿蚊吸引率高低依次为：3-莰烯>乙酸乙酯>α-石竹烯>α-蒎烯>异松油烯;3-莰烯对瘿蚊的吸引率最高,达到74.20%,显著高于α-蒎烯和异松油烯,乙酸乙酯吸引率次之,达到66.07%;异松油酯的趋避性最高,达到74.25%,显著高于其他挥发物。实验中也显示浓度阈值现象,α-蒎烯在浓度0.5 mL/L和1 mL/L浓度范围内有显著的趋避效果,在高于或低于此范围内的其他浓度引诱率和趋避率差异不显著。α-石竹烯高浓度（1.0 mL/L and 2.0 mL/L）对芒果壮铗普瘿蚊有显著引诱作用,3-莰烯和α-石竹烯处理组随着浓度的升高对瘿蚊的引诱率增加。研究结果为阐释瘿蚊入侵机理提供理论依据,为开发引诱剂或趋避剂提供技术支撑。     

Movement and Distribution of Cryptolestes ferrugineus (Coleoptera: Laemophloeidae) Adults Under Different Temperature Differences in Different Lengths of Horizontal Grain Columns

Understanding insect movement and distribution is critical for developing an effective insect pest management protocol. Movement and distribution of adult Cryptolestes ferrugineus (Stephens) in response to nominal temperature differences of 5, 10, 15, and 20°C in 1- and 2-m horizontal columns filled with 12.5% moisture content wheat were studied in 24, 48, and 72 h of movement times. In the wheat columns without temperature differences, adults had a diffusion distribution pattern caused by their random movement. Adults showed bias movement to the warmer grain in wheat columns with temperature differences and preferred the warmer grain regardless of the magnitude of temperature differences in less than 24 h. Their distribution did not have significant differences among different movement times in 1- or 2-m columns. About 40% of adults moved to the warmer wheat located at 0.4 to 0.5 m in the 1 m column but did not move to the warmer wheat located at 0.9 to 1 m in the 2-m column. Therefore, length of grain column influenced detection of warmer grain by insects. Adults under different temperatures had a similar response as that under linear temperature gradients.