强健性蚕品种海的育成及云·山×东·海的选配

采用杂交、定向培育、系统选择的方法 ,育成强健性多丝量品种海 ,并引进苏花、871组配成云·山×东·海的四元杂交组合。经 5个攻关点联合鉴定表明 ,万蚕收茧量 17 5 3kg、万蚕茧层量 4 179kg、茧丝长 1184m、解舒丝长 90 7m、鲜毛茧出丝率 18 5 %、洁净 94 98分 ,主要经济指标全面超过对照种。已通过国家农作物品种审定委员会审定 ,并在生产上试繁推广     

一种新的系统化的固溶体理论：键参数函数和尺寸因素方法

使用张邦维所提出的键参数函数和尺寸因素理论方法，对５６种金属基体二元合金的固溶度进行系统的研究，发现分隔每个基体金属可溶与不溶元素的定量方程式是一抛物线或椭圆，理论预言的总准确率对抛物线和椭圆规律分别为８７．２％和９０．３％，表明，这种对固溶度的理论研究，无论是系统性还是理论结果与实验数据符合程度都是文献中所未有过的。     

相同投入不同产出水平下桉树生产周期的确定

根据桉树的实际培育和利用过程，对广西东门林场种植的白桉（Ｅｕｃａｌｙｐｔｕｓａｌｂａ）、巨桉（Ｅ．ｇｒａｎｄｉｓ）和尾叶桉（Ｅ．ｕｒｏｐｈｙｌｌａ）三个树种进行投入产出的边际分析，通过计算每公顷林地的利润，每绝干吨木片成本，增量收入与增量成本的对比关系研究其生产周期。结果是三种桉树的合理生产周期是１０年，即第９年进入主伐，主伐后一年开始下一次更新。只有这样才能获得最佳的经济效益。     

大兴安岭经济林资源开发利用展望

大兴安岭林区蕴藏着丰富的野生经济林资源,许多为风味独特的食用品和名贵药材,这些资源利用率极低,具有很大的开发利用潜力。本文研究了开发利用野生经济林资源的战略措施。     

黄土高原苜蓿草业基地组建的可行性分析

从黄土高原地区农业生产的实际出发，结合苜蓿的生物学特性及其国内外市场前景，分析了在本区组建苜蓿草业基地的必要性及可能性。指出组建苜蓿草业基地是本区农业实现水旱并举增进农业可持续发展能力的重要途径。     

尾叶枝叶片水提液对小麦生长的影响

以小麦湘麦13号品种为实验材料,研究了尾叶桉叶片水提取液对小麦种子生长的影响．结果表明:尾叶桉叶片水提取液对小麦种子萌芽有显著抑制作用,当浓度为30mg／ml时发芽率下降40％;对小麦生长亦有显著抑制作用,其中4mg／ml与5mg／ml的浸提液抑制作用尤为显著,4mg／ml抑制苗高39％、根长28％;5mg／ml抑制苗高61％、根长56％;30mg／ml的浸提液令小麦幼苗叶绿素含量降低了51％．呼吸速率降低了64％。说明尾叶桉叶片水提取液物质具有较强的化感作用。     

Mammary carcinoma with sebaceous differentiation in a dog

This report describes an invasive mammary carcinoma with a rare distinctive feature characterized by sebaceous differentiation of tumor cells. This tumor occurred in a 10-year-old female mixed breed dog. The patient had two masses in the left fifth mammary gland. Grossly, the masses were firm, whitish to light brown, and superficially ulcerated. On cut surface, they were multilobulated with foci of necrosis. Microscopically, the tumors were composed of two distinctive neoplastic components, intraductal papillary adenocarcinoma and sebaceous carcinoma. The regions of sebaceous tumor were clumped separately, contained well-developed sebaceous cells and keratinized epithelial cells, and were surrounded by few to several layers of basaloid cells. The cells with abundant foamy cytoplasm that resembled sebaceous cells were also found within the intraductal papillary-like nests of mammary carcinoma, providing evidence of sebaceous metaplasia. Sebaceous differentiation in a mammary gland tumor is possible, because skin appendages and ductal apparatus of the mammary gland share a common anlagen. This tumor had an aggressive behavior with lymphatic metastasis. Consequentially, the dog had a poor prognosis.     

湖北省香榧产业发展现状及建议

通过对香榧产业在全国主产区以及本省区域发展现状的调查,分析了该产业在湖北省发展具备的资源优势、生态环境优势和市场潜力优势,针对香榧产业发展中存在的良种缺乏、种植和加工技术滞后、建园成本高,回本时间长的问题,提出了积极争取国家政策和资金支持,以企业为龙头,走公司(合作社)+农户的产业化发展之路;通过科技攻关,解决生产中存...     

Effects of Phyllostachys pubescens expansion on underground soil fauna community and soil food web in a Cryptomeria japonica plantation,Lushan Mountain,subtropical China

Journal of Soils and Sediments - In order to determine the interactive effect of Phyllostachys pubescens (moso bamboo) expansion to adjacent coniferous forest (Cryptomeria japonica, Japanese cedar)...