“8455”小麦植株化学成分与麦蚜（长管蚜、二叉蚜）种群消长的关系

通过对两种肥力条件下的“8455”小麦植株化学成分与麦长管蚜和麦二叉蚜种群消长关系的研究与分析,结果表明可溶性糖、含钾量、含水量是影响麦二叉蚜种群消长的主要因子,胱氨酸是影响麦长管蚜种群消长的主要因子。     

不同树种混交林及其纯林对土壤理化性质影响的研究

对针阔混交林土壤理化性质的研究表明,针阔混交林比针叶树纯林对土壤的改良作用要好,它使土壤总孔隙度增加２—１９％,水分含量增加６—３１％,枯枝落叶年凋落量增加２—２００％;土壤养分含量全Ｎ、ＮＨ４－Ｎ、代换性Ｃａ、代换性Ｍｇ和腐殖质含量分别增加４５—７５％、３３—８２％、５５—８５％、４４—８４％和３７—４６％．     

杉木连栽土壤对其幼树生长的影响

在会同林区采用３种不同连栽杉木次数的土壤,进行杉木幼树盆栽试验．结果表明,杉木连栽不利其幼树生长．连裁使幼树高生长下降３７—４０％,基径下降１９—２８％,冠幅下降２１—２９％,总生物量减少４５—５０％．杉木连栽还造成土壤养分递减,即腐殖质减少７—２８％,速效养分下降２３—２８％,土壤微生物数量和活性也大大降低．因此,杉木纯林连栽经营方式应尽快改变．     

天然吸附剂—壳聚糖吸附性能的研究

本文通过研究天然吸附剂—壳聚糖对古龙酸、缬氨酸、水杨酸和谷氨酸等物质的吸附性能,主要研究了吸附容量随时间变化,吸附容量与pH值的关系以及它们的饱和吸附容量,从而为这种天然吸附剂的应用提供了基础。     

肌苷发酵液絮凝除菌体的研究

目前国内肌苷生产厂家普遍采用的提取方法是“双柱法”,即先用阳离子柱吸附,然后再用炭柱吸附。该方法不但周期长,工作量大,能耗高,而且提取收率低,一般只有60％左右,使我国肌苷的生产成本大大提高。因此,寻求新的提取方法,降低生产成本,是肌苷生产厂家及有关科技人员所共同关注的问题。肌苷发酵液的除菌体就是新法提取的步骤之一,它可以省去阳离子吸附柱,直接采用炭柱吸附,采用此法可使提取周期大大缩短,降低能耗,提高提取收率。 肌苷菌体较难清除,本研究采用能耗低、易操作,工作量小的絮凝方法,所用的絮凝剂为天然无毒物质,因此沉淀菌体可用作饲料蛋白,起到一举两得的作用。     

L．B－G．O对小鼠U_（14）宫颈癌细胞DNA合成和超微结构的影响

本实验合并应用枸杞有效成份和大蒜有效成份,作用于Ｕ_１４腹水型宫颈癌小鼠,腹腔注射第四天,发现一般状况改善,取腹水观察,癌细胞破损,ＤＮＡ、ＲＮＡ荧光染色强度减弱,有大量白细胞和巨噬细胞围绕;流式细胞分析Ｇ＿１期细胞堆积,超微结构显示胞质中线粒体肿胀,嵴破坏甚至中空,粗面内质网扩大、脱颗粒,肯定了其作用的效果。此因枸杞有效成分活化巨噬细胞与肿瘤细胞紧密结合而起到溶瘤作用,与大蒜有效成分直接杀伤而作用维持短暂结合起来,可大大提高抗癌作用。     

满族新生儿血红蛋白F中G_γ／A_γ比值测定及其异常者γ－珠蛋白基因图谱分析

以聚丙烯酰胺凝胶电泳方法测定了３３１例辽宁满族新生儿脐带血血红蛋白Ｆ中Ｇγ／Ａγ比值。结果显示：高Ｇγ（＞８０％）者４例,占１．２１％,其基因频率（ｆ）为０．００６０４,低Ｇγ（３０－４８％）者６例,占１．８１％,其基因频率为０．００９０６,其余正常,Ｇγ平均值为６５．２３±６．３８％。未发现ＡγＴ链。对其中八例异常者（４例高Ｇγ值,４例低Ｇγ值）的染色体ＤＮＡ进行了基因图谱分析,确定４例高Ｇγ值者基因型有两种：Ｇγ－Ｇγ／Ｇγ－Ａγ二例,Ｇγ－ＡＧγ－Ａγ／Ｇγ－Ａγ二例;４例低Ｇγ值者基因型有二种,分别为：Ａγ－Ａγ／Ｇγ－Ａγ二例和－ＧＡγ／Ｇγ－Ａγ二例。其中Ａγ－Ａγ基因型在中国人群中未见报道过。     

cⅠ857基因的体外定位同义突变

 ｃⅠ８５７基因的体外定位同义突变陈南春,高辉,陈苏民,杨萍,刘新平（西安第四军医大学分子生物学研究所,西安７１００３２）外源基因要在大肠杆菌中获得高表达,需要合适的ＳＤ序列和可调控的强启动子［１］。ＰＬ启动子在原核启动子中属强启动子,它受ｃⅠ基因产物...     

HAPLOID PARTHENOGENETIC SPOROPHYTES OF LAMINARIA JAPONICA (PHAEOPHYCEAE)1

Parthenogenetic sporophytes were obtained from three strains of Laminaria japonica Areschoug. These sporophytes grew to maturity in the sea, producine spores that all grew into female gametophytes. These female gametophytes gave rise to another generation of parthenogenetic sporophytes during the next year, so that by the year 1990 parthenogenetic sporophytes had been cultivated for 12, 9, and 7 generations, respectively, for the three strains. When female gametophytes from parthenogenetic sporophytes were combined with normal male gametophytes, normal sporophytes that reproduced and gave rise to both female and male gametophytes were obtained. The parthenogenetic sporophytes were shorter and narrower than the normal sporophytes of the same strain. Chromosome counts on mature sporophytes showed that normal sporophytes (from fertilized eggs) were diploid (2n = approximately 40) and that the spores they produced were haploid (n = approximately 20), while nuclei from both somatic and sporangial cells in parthenogenetic sporophytes were haploid. All gametophytes were haploid. Young sporophytes derived from cultures with both female and male gametophytes were diploid, while young, sporophytes obtained from female gametophytes from parthenogenetic sporophytes had haploid, diploid, or polyploidy chromosome numbers. Polyploidy was associated with abnormal cell shapes. The presence of haploid parthenogenetic sporophytes should be use in breeding kelp strains with useful characteristics, since the sporophyte phenotype is expressed from a haploid genotype which can be more readily selected.