用土袋水培法研究水稻黄叶生理病

以土袋水培法,结合普通盆栽研究水稻黄叶生理病与红壤溶液Fe、Si关系果表明,与无稻红壤溶液相比,植稻红壤的Si/Fe下降而土袋水培Si/Fe升高。电子探针分析显示土培稻根表皮层细胞外壁的Fe峰很高,而土袋水培者的Fe峰很低或为零。讨论了土袋水培的Si/Fe升高的原因及其对消除水稻黄叶生理病的作用。     

酸碱对防止泡桐木材变色的影响

对酸碱度影响泡桐木材色泽进行了研究,并对弱碱溶液防止泡桐木材变色的作用做了试验与分析。结果表明:酸碱度影响泡桐木材颜色变化,在偏酸条件下泡桐木材的白度易于向劣化方向发展,总色差升高;偏碱条件下泡桐木材白度提高,总色差下降,色泽指标明显趋好。0.25%的弱碱溶液改善泡桐木材的渗透性,能溶出木材内部部分内溶物,可浸提的内溶物中多含有变色前驱物质,促进了防止泡桐木材的变色作用,而又不会污染泡桐木材材面。防变色剂具有一定的防变色作用,但只用防变色剂预防泡桐木材变色容易出现返色现象,综合使用弱碱溶液与防变色剂防治效果比单独使用防变色剂效果好,经0.25%的弱碱溶液同防变色剂处理可使泡桐木材防变色效果内外趋于一致。     

盐酸吗啉胍在鸡体内药物代谢动力学研究

本文采用紫外分光光度法，研究了经口灌服和静脉注射盐酸吗啉胍后，在成年健康尼克蛋鸡体内的药物代谢动力学过程．主要药物代谢动力学参数：消除半衰期为９．９８±１．０４ｈ－１与８．５２±０．３６ｈ－１．分布半衰期为１．５６±０．７１ｈ－１与０．４９±０．０９ｈ－１，总消除速率常数为４．４０６３±０．２７２ｍｇ／ｋｇ．ｈ与５．５５７９±１．２６３ｍｇ／ｋｇ．ｈ，总表观分布容积为６５５．９９±８７９．７２ｍｌ／ｋｇ与５４６９．３±２５５．８ｍｌ／ｋｇ，中央室消除速率常数为０．０７５±０．０１８ｈ－１与０．１２９±０．０２９９ｈ－１，药时曲线下面积为１１．２５±１．５６ｍｇ／Ｌ．ｈ与２２．８１±０．５ｍｇ／Ｌ．ｈ     

蔬菜根结线虫病发生规律研究

蔬菜根结线虫在江西１年发生５－６代；主要以卵、幼虫和雌虫在病根、病残体和病土中越冬，以卵囊团在土壤中存活力最强，在５￣５０ｃｍ土层中均可越冬。１０℃以上开始生长发育，１２℃以上侵染寄主，２５￣３０℃生长发育最好，４２℃４ｈ死亡，５５℃１０ｍｉｎ死亡。５月初开始发病，６月下旬至１０月上旬为发病高峰期，１１月中旬以后以卵、幼虫和雌虫越冬。     

MHC class I deficiency: susceptibility to natural killer (NK) cells and impaired NK activity.

The role of major histocompatibility complex (MHC) class I expression in natural killer (NK) cell target recognition is controversial. Normal T cell blasts from MHC class I-deficient mutant mice were found to serve as target cells for NK cells in vitro, which suggests that MHC class I molecules are directly involved in NK cell recognition. Spleen cells from the mutant mice were deficient in their ability to lyse MHC class I-deficient target cells or NK-susceptible tumor targets, and mutant mice could not reject allogeneic bone marrow. Thus, class I molecules may participate in the positive selection or tolerance induction of NK cells.     

Melanopsin-containing retinal ganglion cells: architecture, projections, and intrinsic photosensitivity

The primary circadian pacemaker, in the suprachiasmatic nucleus (SCN) of the mammalian brain, is photoentrained by light signals from the eyes through the retinohypothalamic tract. Retinal rod and cone cells are not required for photoentrainment. Recent evidence suggests that the entraining photoreceptors are retinal ganglion cells (RGCs) that project to the SCN. The visual pigment for this photoreceptor may be melanopsin, an opsin-like protein whose coding messenger RNA is found in a subset of mammalian RGCs. By cloning rat melanopsin and generating specific antibodies, we show that melanopsin is present in cell bodies, dendrites, and proximal axonal segments of a subset of rat RGCs. In mice heterozygous for tau-lacZ targeted to the melanopsin gene locus, beta-galactosidase-positive RGC axons projected to the SCN and other brain nuclei involved in circadian photoentrainment or the pupillary light reflex. Rat RGCs that exhibited intrinsic photosensitivity invariably expressed melanopsin. Hence, melanopsin is most likely the visual pigment of phototransducing RGCs that set the circadian clock and initiate other non-image-forming visual functions.     

中南地区几种地带性土壤表面电荷特性与pH的关系

用改进的Schofield法、盐滴定法等方法研究测定了我国中南地区5种不同地带性土壤的表面电荷特性。结果表明：1)在同一pH条件下，土壤负电荷量由北向南呈递减趋势，正电荷量呈递增趋势，与供试土壤粘土矿物、铁铝氧化物组成及含量有关；2)砖红壤中负电荷以可变负电荷为主，棕红壤和红壤既有较大数量的可变负电荷，并含有一定数量的永久负电荷，黄褐土和黄棕壤负电荷量随pH的变化较小；3)供试土壤的PZC从北到南逐渐升高，砖红壤的PZNC为4．2，其它土壤在试验pH范围内不存在PZNC。     

栽培稻与普通野生稻遗传距离估测和聚类初报

对１５个栽培稻和１７个普通野生稻的１９个性状进行了遗传距离及聚类分析。结果表明，栽培稻与普通野生稻是相互有联系的两大类群；源于相同地域分布的普通野生稻未必具有相近的亲缘；根据遗传距离的大小，聚为７个生态类型，遗传距离反映了类型间的亲缘关系，是选择杂交亲本的重要参数，对野生稻种资源的利用提供一定的依据。     

苦丁茶树种子育苗的研究

以９月份采收的苦丁茶树种子为材料，进行促后熟、发芽研究的结果表明：破壳、外源激素处理对发芽无促进作用；低温贮藏促进胚乳吸收．２％蔗糖溶液处理种子，能提早发芽３～４个月，但播种时，须将种子浅埋于细土中，否则将影响出苗率．     

氟化物引起家蚕的组织病变

本试验通过电子显微镜观察家蚕添食氟化物后体壁及中肠的组织变化，结果显示体壁及中肠都受到不同程度的破坏，体壁上皮细胞出现空泡，严重在外表皮层出现沉积物，中肠病变更为明显，细胞层结构松驰，细胞内出现空泡，线粒体空化，内质网膨胀化，核膜退化，核质凝团状。本文从组织学角度探讨了氟化物引起家蚕中毒的机制。为蚕桑生产中大气污染的防治提供部分理论依据。