牛胰多肽（BPP）二级结构的红外光谱和圆二色谱分析

牛胰多肽（ｂｏｖｉｎｅｐａｎｃｒｅａｔｉｃｐｏｌｙｐｅｐｔｉｄｅ,ＢＰＰ）是胰脏分泌的一种含有３６个氨基酸的多肽［１］,ＢＰＰ能预防和治疗由胆酸盐诱发的大鼠急性胰腺炎,具有细胞保护作用。本文用傅里叶变换红外光谱（ＦＴ－ＩＲ）和圆二色谱（ＣＤ）,对ＢＰＰ在水溶液中的二级结构进行了研究。两种方法的分析结果互相补充,进一步确定了ＢＰＰ在溶液状态的二级结构。本研究为进一步探讨ＢＰＰ抑制膜融合的机理打下了基础。     

蛋白激酶C在血小板聚集中的作用

利用￣（３２）Ｐ－ＮａＨ２ＰＯ４标记猪血小板,以蛋白激酶Ｃ的４０ｋＤ底物为蛋白激活的标志．用血小板激动剂在聚集浓度范围内处理血小板,结果表明,除了不能使猪血小板聚集的肾上腺素外,凝血酶等激动剂都使血小板４０ｋＤ底物蛋白磷酸化明显增加,同时３８ｋＤ,２６ｋＤ蛋白质磷酸化也明显增加,且４０ｋＤ底物磷酸化与血小板聚集有平行增加关系．蛋白激酶Ｃ在血小板聚集中可能起着重要的调节作用。     

浒苔多糖的降血脂及其对SOD活力和LPO含量的影响

浒苔多糖剂量１５０ｍｇ／ｋｇ可使高胆固醇血症小鼠血清胆固醇下降２２％,剂量１６８ｍｇ／ｋｇ可使高脂血症大鼠ＴＣＨ和ＴＧ分别降低５８％和６１％,ＨＤＬ升高２７％,剂量２５０ｍｇ／ｋｇ可分别提高血清、脑和肝ＳＯＤ活力３３％、１１８％和２２４％,剂量１６８ｍｇ／ｋｇ对高血脂大鼠血清和心脏ＬＰＯ含量降低３５％和４６％。     

Chromosome painting of Amigo wheat

Chromosome painting using multicolor fluorescence in situ hybridization showed that, in addition to the T1AL·1RS translocation derived from rye, a segment from chromosome 3Ae#1 of Agropyron elongatum (2n=10x =70), is present in Amigo wheat. The Agropyron chromosome segment is located on the satellite of chromosome 1B and the translocation chromosome is designated as T1BL·1BS-3Ae#1L. T1BL·1BS-3Ae#1L was inherited from Teewon wheat and carries resistance genes to stem rust (Sr24) and leaf rust (Lr24). The Agropyron chromosome segments in different Sr24/Lr24 carrier wheat lines, including Agent, TAP 48, TAP 67, Teewon, and Amigo, showed a diagnostic C-band, and were derived from the same chromosome, 3Ae#1.     

The Myb and Ahi-1 genes are physically very closely linked on mouse Chromosome 10

Ahi-1 has previously been identified as a common helper provirus integration site on mouse Chromosome (Chr) 10 in 16% of Abelson pre-B-cell lymphomas and shown to be closely linked to the Myb protooncogene. By using long-range restriction mapping, we have mapped the Myb and Ahi-1 regions within a 120-kbp DNA fragment. The Ahi-1 region is located approximately 35 kbp downstream of the Myb gene. A further comfirmation of this finding was obtained by screening a mouse YAC library. The three positive clones obtained contained both the Myb and Ahi-1 gene sequences. To test whether provirus integration in the Ahi-1 region enhances the expression of Myb by a cis-acting mechanism, we have also examined Myb gene expression in A-MuLV-induced pre-B-lymphomas. Our data have revealed that there is no clear evidence for such activation in the tumors we have tested, indicating that provirus insertion in the Ahi-1 region is activating a novel gene, apparently involved in tumor formation.     

油梨果实的生长和内含物变化的观察

本文报道对油梨果实的生长及内含物的变化的观察结果．果实生长发育过程中,以６—７份生长最快,干物质及脂肪含量由低到高变化,以１１月份增加最快,蛋白质含量由高到低递诚．１１月份后含量相对稳定,总糖和维生素Ｃ含量随果实的发育程度而下降。     

樟脊网蝽生物学特性观察

樟脊网蝽是香樟的重要害虫,在上海1年发生4代。4月下旬越冬卵始孵,9月下旬开始出现越冬卵。成虫末见期在11月中旬。经室内饲养,樟脊网蝽第三代各龄若虫历期为：一龄61．45±7．8h,二龄48．00±7．6h,三龄43．43±7．6h,四龄51．00±8．0h,五龄70．50±7．5h,整个若虫期历期为281．92±14．8h。第三代野外雌雄比为1：4．07。第三代每雌产2～96粒。日最高产卵量为34粒／头,孤雌可产卵。10％灭百可2000倍稀释液和50％杀螟松2000倍稀释液喷雾防治效果可达93％以上。     

油菜素内酯促进绿豆上胚轴伸长与蛋白质和核酸合成的关系

用饲喂蛋白质和核酸合成的放射性前体［３ Ｈ］－Ｐｈｅ、［３ Ｈ］－尿嘧啶和［３ Ｈ］－胸腺嘧啶证实了油菜素内酯（ＢＲ）能促进绿豆上胚轴的生长和蛋白质、ＲＮＡ 及ＤＮＡ 的合成。用蛋白质和核酸合成抑制剂（ＣＨ、Ａｃｔ．Ｄ、５－Ｆｕ）进一步探讨它们对上胚轴伸长的抑制作用与蛋白质、ＲＮＡ、ＤＮＡ 和ｍ ＲＮＡ 合成之间的关系。证明了上胚轴的伸长依赖于蛋白质和核酸的合成,尤其是依赖于ｍ ＲＮＡ 的合成。说明ＢＲ是在转录水平上调节基因的表达,进而促进上胚轴的伸长     

陕西省常见蜜源植物花粉形态的研究

运用扫描电子显微镜,对陕西省境内３０种常见蜜源植物的花粉粒进行了观察研究,描述了花粉粒的大小、萌发孔类型及其表面纹饰等形态特征。结果表明：绝大多数种的蜜源植物,其花粉粒的形态特征明显不同。本文还就花粉粒形态特征,在鉴定蜜源植物花粉的属种,确定蜂蜜的产地、评价蜂蜜的品质等方面进行了探讨。     

沈阳西部污灌水中有机污染物的分析

沈阳西部污灌水中有机污染物的分析刘海玲,张丽珊,姚家彪,于殿臣,朱岩,可夫,姜萍（中国科学院沈阳应用生态研究所,１１００１５）ＡｎａｌｙｓｉｓｏｆＯｒｇａｎｉｃＰｏｌｌｕｔａｎｔｓｉｎＩｒｒｉｇａｔｅｄｓｅｗａｇｅＩｎＷｅｓｔｅｒｎＳｈｅｎｙａｎｇ．...