Effects of N-methyl-D, L-aspartate on secretion of growth hormone-releasing hormone from the boar hypothalamic-preoptic area and median eminence in vitro

N-methyl-D, L-aspartate (NMA) elicited secretion of growth hormone (GH)-releasing hormone from both the hypothalamic-preoptic area and the median eminence that were collected from boars. We suggest that the previously described increase in GH secretion that follows peripheral treatment of swine with NMA is attributable, at least in part, to NMA-stimulated secretion of GH-releasing hormone from the central nervous system.     

网状阳极在储罐底板阴极保护中的作用

储罐底板的阴极保护可采用网状阳极系统，柔性阳极系统以及在储罐基础内铺设镁带等三种方式。经济比较表明，在储罐底板采用网状阳极系统，外侧无需使用防腐层，既合理又经济。     

路灯照射对大豆生长发育和产量的影响

通过对淮北五马路沿线夏大豆的田间调查分析表明：受路灯照射的影响，夏大豆株高增加，开花期、成熟期推迟，底荚部位上升，单株生产力下降。且距离越近，植株越高，开花、成熟越晚，底荚部位越高，单株生产力越低。     

锯链张力和松弛的分析

静止状态下锯链不垂离导板的临界张力与导板轮廓线圆半径和锯链质量线密度成正比．无缓冲器导板的锯链安装张力应比有缓冲器导板的大．锯链和链轮的制造误差可能引起锯链附加张力或松弛下垂．锯链的松弛程度可用趾部间隙来衡量．锯链与导板的热胀冷缩不同步可能引起热张力或热松弛．文章给出了各种张力和趾部间隙的计算公式．     

多伦县风蚀地貌及风蚀量评价研究

在多伦县沙漠化土地调查过程中,就其风蚀地貌进行了详细的研究。本文不仅论证了风蚀地貌的形成、类型和分布,而且以翔实的测定数据,并采用克拉瓦洛维克的风蚀强度公式计算了该地区不同景观类型区的风蚀量。以论据为基础,研讨了增加地表粗糙度的方法、成效以及防止或减缓风蚀的有效途径。     

滇池底泥菌类组成及与污染关系的研究

通过对滇池不同位点底泥样品的分析，调查了滇池底泥中固氮菌类、硝化菌类及其他菌类的数量及分布状况。分析了这些细菌参与氮循环与滇池富营养化之间的关系，得出可用底泥中固氮菌作为滇池污染参考指示菌株和滇池地质条件，以及菌类微生物的分布变化对滇池富营养化具重要影响的结论。     

桩基钻孔偏位处治方法简介——介绍一种钻孔入岩倾斜偏位的处理方法

采用冲击钻进行桩基础钻孔施工,经常会出现入岩倾斜偏位的现象,如果处理不当,就会造成 废桩。这里介绍一种简单而有效的处治方法——用混凝土封底法,针对这种现象进行处理。     

Frozen bread dough: Effects of freezing storage and dough improvers

This review focuses on the effects of freezing storage on the microstructure and baking performance of frozen doughs, and provides an overview of the activities of dough improvers, including emulsifiers, hydrocolloids and other improvers used in frozen dough applications. The overall quality of bread baked from frozen dough deteriorates as the storage of the dough at sub-zero temperatures increases due to several factors which are discussed. Lipid-related emulsifiers such as diacetyl tartaric acid esters of mono and diglycerides and sucrose esters employed as anti-staling agents, dough modifiers, shortening sparing agents, and as improvers for the production of high-protein bread have also been employed in frozen doughs. Hydrocolloids are gaining importance in the baking industry as dough improvers due to their ability to induce structural changes in the main components of wheat flour systems during breadmaking steps and bread storage Their effects in frozen doughs is discussed. Other dough improvers, such as ascorbic acid, honey and green tea extract, are also reviewed in the context of frozen doughs.     

底拖网回捕增殖对虾对经济幼鱼的损害

1984～1986年在山东南部沿海八大港湾同步增殖放流体长3cm以上的虾苗14.9116亿尾,累计回捕增殖对虾1.4亿尾,平均回捕率为9.4％,其中拖网回捕增殖对虾累计为1184.7t,但损害的七种经济幼鱼累计为4402t,应引起重视这一问题。