ASI法测定土壤有效Zn、Cu、Fe、Mn与植物吸收的相关性研究

本文应用ASI法测定我国北方主要耕地土壤的有效态zn、cu、Fe、Mn,根据测定值高低分别选取各土壤类型的十个土壤样本进行植物栽培的微量元素试验．结果表明,ASI—Zn、Cu、Fe、Mn测定值与小麦生物量均没有达到显著相关水平（n=40,P〉0．05）;ASI—Cu、Fe测定值与小麦吸收量均没有达到显著相关水平（n=40,P〉0．05）,ASI-Zn、Mn测定值与植物吸收量达到显著相关水平（n=40,P〈0．05）．以土壤ASI法临界值的2．5倍为补充土壤微量元素量,小麦吸收zn是有效且合理的,但是小麦吸收cu、Fe和Mn是无效的,表明ASI法的土壤微量元素丰缺指标在我国北方农田土壤应用尚需进一步研究．     

消癖散结汤治疗乳腺增生病肝郁脾虚型疗效观察

目的:观察自拟消癖散结汤治疗乳腺增生病肝郁脾虚型的疗效。方法:将69例患者随机分为两组,治疗组35例口服自拟消癖散结汤,对照34例口服乳康片。结果:总有效率治疗组为97.10%,对照组为64.70%,2组比较,差异有统计学意义(P<0.01)。结论:消癖散结汤治疗乳腺增生病疗效显著,无明显毒副反应,值得推广运用。     

英语学习策略发展研究的回顾与展望

英语学习策略的发展是动态的过程.策略在一生中不是固定的,通过自然发展和训练而改变.本文从英语策略的自然发展和训练获得两条线索对英语策略的发展进行了一个全面梳理与总结.英语策略在自然发展上存在关键期,认知策略在学习初期,对学习作用十分明显.但随着年级提高,认知策略在学习中的作用越来越让位于其它策略.元认知策略、社会支持策略和情感策略随着年级的升高,作用越来越明显.英语策略的训练对学生成绩提高有效果,尤其对于中下水平学生效果更明显.但在策略训练中,要特别防止学生策略"利用性缺陷"的产生.     

The response of plants to acid soils

Summary Interactive effects between acid deposition and the rest of the environment are the key to further understanding. Although this article deals only with plant growth in relation to the chemical state of the soil and not with aerial effects, it is still possible to illustrate a number of interactions and patterns of response among both vascular and non-vascular components of vegetation. Evidence is examined with regard to plant age, pre-treatment and the nature of nutrient supply. It includes consideration of both effects of soil on plants and of plants on soil, notes both antagonisms and symbioses, and draws attention to inducible defence systems.     

运动与铁缺乏

本文通过对运动与铁缺乏状况的全面分析，提出铁摄入量达到日常量以上是保证运动锻炼中铁营养平衡的关键。     

保存人羊膜用于角膜缘缺陷兔眼表面重建

探讨羊膜移植术在角膜缘缺陷兔眼表面的作用,建立兔全角膜缘缺陷的动物模型,移植眼早期应用保存的人羊膜移植于受损区域,对照眼常规保守治疗,观察其角膜新生管及上皮层愈合情况。愈合后1个月,取角膜,做普通病理及扫描电镜检查。结果显示对照眼角膜上皮层愈合较慢,新生血管粗大丰富,愈合后上皮层不稳定,含有杯状细胞。羊膜移植的眼表面上皮层愈合快,新生血管细小,愈合后的上皮层光滑,稳定, 杯状细胞主要分布于周边角膜。表明羊膜移植能促进上皮细胞移行、增殖、获管稳定的眼表层。羊膜移植后,上皮仍为结膜型上皮。     

交通肇事罪相关司法解释缺陷分析

最高人民法院有关司法解释修改了现行刑法中交通肇事罪的成立要件,存在着诸多可商榷的地方.笔者从交通肇事罪犯罪构成出发对其进行分析,以求进一步完善以避免理论认识上的分歧,并对争议问题做出恰当的理解和处理.     

缺磷胁迫对沙角衣藻碱性磷酸酶的影响

以沙角衣藻（Chlamydomonas sajisao Lewin）为材料,通过活性PAGE电泳的方法,研究了在缺磷营养胁迫下,细胞内碱性磷酸酶的活性变化,结果表明,和正常的生长条件相比,缺磷胁迫导致沙角衣藻的碱性磷酸酶的活性有显著的变化,在缺磷胁迫下,不仅使碱性磷酸酶的合成量增加,而且其活性也有所增强。     

A Reconsideration of Prototype Theory

his paper makes an attempt to review the background when prototype theory was proposed,affirm its significant role in the study of psychology and linguistics and point out its theoretical deficiencies,which is helpful to reduce the vacuous nature of the theory.     

Treatment of zinc deficiency without zinc fortification

Zinc （Zn） deficiency in animals became of interest until the 1950s. In this paper, progresses in researches on physiology of Zn deficiency in animals, phytate effect on bioavailability of Zn, and role of phytase in healing Zn deficiency of animals were reviewed. Several studies demonstrated that Zn is recycled via the pancreas; the problem of Zn deficiency was controlled by Zn homeostasis. The endogenous secretion of Zn is considered as an important factor influencing Zn deficiency, and the critical molar ratio is 10. Phytate （inositol hexaphosphate） constituted up to 90% of the organically bound phosphorus in seeds. Great improvement has been made in recent years on isolating and measuring phytate, and its structure is clear. Phytate is considered to reduce Zn bioavailability in animal. Phytase is the enzyme that hydrolyzes phytate and is present in yeast, rye bran, wheat bran, barley, triticale, and many bacteria and fungi. Zinc nutrition and bioavailability can be enhanced by addition of phytase to animal feeds. Therefore, using phytase as supplements, the most prevalent Zn deficiency in animals may be effectively corrected without the mining and smelting of several tons of zinc daily needed to correct this deficiency by fortification worldwide.