米糠日粮添加酶制剂对雏鹅代谢激素和生化指标的影响

7日龄雏鹅32只，随机分成对照组和试验组，饲以米糠（占30％）基因日粮，试验组添加0.2%的酶制剂。试验期为7－21日龄。21日龄时采取血样，测定其激素含量和生化指标。结果显示，（1）与对照相比较，酶制剂使雏鹅血液胰岛素水平升高40．82％（P＜0．01），血糖水平升高4．76％（P＞0．05），胰高血糖素水平降低31．18％（P＜0．01），胰岛素与胰高血糖素的比值升高104．18％（P＜0．01）；（2）血浆谷丙转氨酶活性较对照升高38．39％（P＜0．05），尿酸浓度下降10．60％（P＜0．05）；（3）血浆T3水平较对照升高24．42％（P＜0．05），促甲状腺激素水平下降8．85％（P＞0．05）。以上结果表明，酶制剂通过解除饲料中阿拉伯木聚糖等的抗营养作用，能影响机体代谢激素水平，改变糖和蛋白质的代谢，从而促进雏鹅的生长。     

Effect of compound salvae-dropping-pill on intracellular free calcium concentration of cultured rat myocardial cells in case of hypoxia and reoxygenation

AIM:To examine the effect of compound salvae-dropping-pill (CSDP) on intracellular free calcium in cultured rat myocardial cells subjected to hypoxia and reoxygenation.METHODS:The Fluo- 3/AM was applied to probe intracellular calcium concentration and the fluorescent intensity was detected using laser confocal microscopy technique.RESULTS:Fluorescent intensity in hypoxia plus CSDP group was significantly lower (1 217.78±312.07) than that of hypoxia group (1 509±508.48), and the Fluorescent intensity of hypoxia/reoxygenation plus CSDP group was also markedly lower (1 567.91±577.61) than that of hypoxia/reoxygenation group (1 617.60±477.53).CONCLUSION:The cultured rat myocardial cells could be effectively protected by administration of CSDP in case of hypoxia and reoxygenation through decreasing the intracellular calcium concentration.     

Mechanical amplification of insect campaniform sensilla

Research on the mechanical amplification function of natural organisms presents a bio-inspired approach for the future design of strain sensors to be embedded in engineering bodies. By the observation under FTEM, the micromorphology of chafer cuticle is found as follows：insect cuticle is a typical example of a natural composite plate with cross-fiber laminates reinforced,on the surface of which a series of trichopores with diameter of 50~70 μm are distributed in the space of 40~50 μm. This microstructure is characterized as a composite plate with holes with cross-fiber laminates reinforced. The stress amplification factor that helps to improve sensilla’s sensitivity is achieved as 2.424 by finite element method and weighted average method. Furthermore continuous helicoidal fibers around the channel under trichopore are found,which resist stress concentration from every orientation and protect the gland and body wall.     

Forming process of asymmetric wall forging

Asymmetric wall products are widely used in the engineering. However, there are many limitations in the traditional forming processes employed to produce them. Oil pump stator has been studied as an instance to present the forming process of asymmetric wall products. First, a theoretical analysis of the forging's forming process has been made. Second, a rigid-visco-plastic finite element model of oil pump stator has been constructed and three dimensions FEM simulation and analyzing of extruding process have been taken by employing the simulation software. At last, parameters of the forming process have been optimized, the rule of forging's metal flow in the forming process has been analyzed and some distributions of stress and strain have been offered. These data can be use to direct the production of the other asymmetric wall forgings.     

杉木幼苗光合及叶绿素荧光特征对氮沉降的短期响应

为了探究模拟氮沉降条件下杉木幼苗光合及叶绿素荧光特征变化规律,从光合生理的角度探讨不同季节杉木幼苗对氮沉降的短期响应。选取杉木幼苗为实验对象,模拟氮沉降实验,设置4个处理水平对照(N0)、低氮(N30:30 kg/(hm²·a)、中氮(N60:60 kg/(hm²·a)、高氮(N90:90 kg/(hm²·a)。结果表明：添加氮以后,杉木幼苗的净光合速率(Pn),初始荧光产量(F₀)、最大荧光产量(F_m)、最大PSII光能转换效率(F_v/F_m)、PSII潜在活性(F_v/F₀)显著降低,水分利用率(Wue)显著增高(P<0.05)。随着氮沉降水平的增加,气孔导度(Gs)与蒸腾速率(Tr)呈现先升高后下降趋势,水分利用率呈现先下降后升高趋势。在中氮和高氮处理下,F_v/F_m、F_v/F₀值显著降低(P<...     

不同生态环境下短季棉早熟及相关性状的混合遗传

分别在河南新乡和新疆石河子2个生态环境下,对短季棉早熟及相关性状进行了主基因-多基因混合遗传分析。结果表明,除花铃期和衣分外,其它性状在2个环境中均检测到主基因。2个环境生育期的最适模型相同且主基因与多基因分量趋势一致,果枝始节、铃重虽最适模型相同,但主基因与多基因分量趋势相反,苗期、蕾期、花铃期、衣分、果枝始节高度2个环境最适模型不同。生育期在不同生态环境早代选择有效,果枝始节高度和果枝始节可作为鉴定早熟性的可靠形态指标。2个环境生育期、蕾期和果枝始节高度均以主基因遗传为主,其它性状均分别以主基因遗传为主或以多基因遗传为主,针对各性状的遗传模式提出了具体的育种策略。     

凤阳山自然保护区福建柏种群结构和分布格局研究

应用植物种群生态学的研究方法,对浙江凤阳山自然保护区福建柏的种群结构和分布格局进行了研究,探讨了其动态过程及机制。结果表明:在所设的样地中,福建柏种群大小级分布图的形状基本相似,种群的年龄结构为稳定型;其分布格局主要以随机分布为主,也有一定比例的集群分布,但集群强度有差异,且幼苗和幼树的集群强度明显大于中树,树种呈扩散趋势。     

不同盐度、碱度、pH值对瓦氏雅罗鱼精子活力及其受精率的影响

为了掌握瓦氏雅罗鱼精子活力及其受精率的最适盐度、碱度和pH的范围,通过设置不同NaCl盐度(1‰,2‰,3‰,4‰,5‰,6‰,7‰,8‰)、NaHCO3碱度(10,20,30,40,50,60,70 mmol/L)、pH值(5.0,5.5,6.0,6.5,7.0,7.5,8.0)梯度范围的溶液及淡水对照组(盐度0、碱...     

Design and Realization of Office Automatic Platform Based on Struts

Apache Struts is one of the most popular open source framework for Web applications and developments using MVC Model2 architectural pattern. Using the Information Technology to improve the efficiency of education service is emergent. The aim of this paper is to demonstrate the design and realization of a platform system software based on Apache Struts framework. By briefly analyzing the extra requirement in higher education service, an architecture based on MVC design pattern is presented. Some core technologies used in the platform system software, such as Struts Tiles and Struts Menu etc, are proposed in details by the end. Because of its struts-based fundamental architecture and running mechanism, the platform system software made a certain performance advantage and largely reduced the developing period.     

新疆高品质陆地棉纤维品质性状遗传分析研究

 以9-1696×CCRI 35配置单交组合及其衍生世代,利用该组合的P₁、P₂、F₁、F₂、B₁和B₂ 6世代群体的纤维品质性状,采用世代平均值法、主-多基因混合遗传模型分离分析法对该组合纤维长度、整齐度、比强度和伸长率4个纤维品质性状做遗传分析。结果表明：（1）4个纤维品质性状均以加性遗传为主,同时检测出显著的上位性效应。经模型适合性检验,纤维长度和伸长率两个纤维品质性状符合加性－显性－上位性遗传模型。比强度和整齐度性状符合加性－上位性遗传模型。（2）比强度和伸长率符合两对加性－显性－上位性主基因＋多基因混合遗传模型,其主基因遗传率分别为：比强度（47.80%）、伸长率（20.07%）。纤维长度和整齐度遗传受主基因和多基因共同控制。