大豆结瘤突变体成分的初步分析及其对硝酸还原酶活性和结瘤的影响

超结瘤大豆（Ｇｌｙｃｉｎｅ ｍ ａｘ （Ｌ．） Ｍｅｒｒ．） ｎｔｓ ３８２ 和不结瘤大豆Ｎｏｄ ４９ 的叶和根组织水提取物经Ｓｅｐｈａｄｅｘ Ｇ２５ 过滤、洗脱,再根据洗脱物对硝酸还原酶（ＮＲ）活性的影响可划分为４ 个组分（ｆｒａｃｔｉｏｎ）样品,即ｎｔｓ ３８２（Ｎｏｄ ４９） Ｆ１、ｎｔｓ ３８２（Ｎｏｄ ４９） Ｆ２、ｎｔｓ ３８２（Ｎｏｄ ４９） Ｆ３ 和ｎｔｓ ３８２（Ｎｏｄ ４９） Ｆ４。其中, ｎｔｓ３８２ Ｆ２ 和Ｆ４ 抑制ＮＲ 活性作用在接种ＵＳＤＡ１１０ 后明显下降, 但接种的ｎｔｓ ３８２ Ｆ２ 却能提高大豆Ｂｒａｇｇ 的结瘤数达一倍, 而接种的ｎｔｓ ３８２ Ｆ３ 和Ｆ４ 的作用不明显。ＮＲ 活性抑制因子不是刺激结瘤的因子, 刺激结瘤的因子主要分布在接种的ｎｔｓ３８２ Ｆ２ 部分中。与这一现象相反, Ｎｏｄ ４９ Ｆ２ 和Ｆ４ 抑制ＮＲ活性的作用在接种后更强, 且也抑制大豆ｎｔｓ ３８２ 的结瘤, 其中Ｎｏｄ ４９ Ｆ４ 抑制结瘤的作用基本不能逆转。抑制结瘤因子主要分布在接过种的Ｎｏｄ ４９ Ｆ４ 部分中     

Protoplast culture and plant regeneration ofPinellia ternata

A study was undertaken to develop a protoplast regeneration system for pinellia. A yield of 19 29 x 10⁵ protoplasts/g F. W. could be obtained from cell suspension cultures incubated in a digestion enzyme solution with 2% cellulase Onzuka R-10, 10% pectinase (Sigma), 0.01% pectolyase Y23. K8P and modified MS media were used to culture protoplasts in: a) liquid, b) liquid-solid double layer, or c) agarose embedded protoplast culture. The former two were conducive to colony formation from protoplast-derived cells. The frequency of cell division was about 8% after 3 days in culture. Gradually adding fresh medium of lower osmotic pressure into the medium for protoplast culture favored cell division. Calli (1–2 mm in diameter) formed after 30–40 days in culture. The calli transferred onto medium supplemented with KT (0.5 mg 1^–1) and NAA (0.2 mg 1)^–1) could regenerate plants after 40–50 days. Of 47 plantlets transplanted into plots, 29 flowered and were fertile.Abbreviations 2,4-D 2,4-dichlorophenoxyacetic acid - NAA -naphthaleneacetic acid - KT kinetin - CH casein hydrolysate     

云南高黎贡山蚤类的生态区系

本文报道了１９８５年以来对我甸横断山南端高黎贡山东、西坡蚤类生态区系的调查及研究结果。共发现蚤类５科２３属４７种（亚种）。文中对该山脉蚤类在不同森林植物带的群落结构、种的多样性及均匀度,各种蚤的栖境幅度、宿主多样性进行了陈述和比较,并对蚤类的区系特征、特有种的区系划分等问题进行了讨论。     

The Role in Ozone Phytotoxicity of the Evolution of Ethylene upon Induction of 1-Aminocydopropane-1-carboxylic Acid Synthase by Ozone Fumigation in Tomato Plants

The rate of evolution of ethylene by tomato plants was rapidlyincreased by O₃ fumigation. The time course of the increasein 1-aminocyclopropane-1-carboxylic acid (ACC) synthase activitywas the same as that in the rate of evolution of ethylene, suggestingthat ACC synthase activity might be a rate-limiting step inthe evolution of ethylene that is caused by O₃ fumigation. Therate of the O₃-induced evolution of ethylene was increased bythe application of ACC to tomato plants, suggesting the involvementof ACC oxidase in the O₃-induced evolution of ethylene. Treatmentof plants with tiron inhibited the evolution of ethane, butnot of ethylene. These results indicated that evolution of ethylenein O₃-treated tomato plants might result from enzymatic reactionscatalyzed by both ACC synthase and ACC oxidase, but not fromstimulation by O₃ of the peroxidation of lipids mediated byfree radicals. Pretreatment of leaves with aminoethoxyvinylglycine (AVG), aninhibitor of ACC synthase, significantly inhibited the evolutionof ethylene that was induced by O₃ and concomitantly reducedthe extent of O₃-induced visible damage to leaves. Treatmentwith 2,5-norbonadiene, an inhibitor of the action of ethylene,strongly reduced the extent of visible damage caused by O₃,even though it did not suppress the evloution of ethylene. Theseresults indicate that ethylene acts on certain metabolic processesto cause visible damage. (Received September 7, 1995; Accepted December 18, 1995)     

Pretreatment with recombinant bovine somatotropin enhances the superovulatory response to FSH in heifers

One of the primary limiting factors to superovulation and embryo transfer in cattle has been the large variability in response, both between and within animals. It appears that the primary source of this problem is the variability in the population of gonadotropin-responsive follicles present in ovaries at the time of stimulation. We have shown that treatment of heifers with recombinant bovine somatotropin (rbGH) increases the number of small antral follicles (2 to 5 mm) and, therefore, enhances the subsequent superovulatory response to eCG. To investigate further the potential of using this approach to improve superovulatory regimens in cattle, the effect of rbGH pretreatment on the response to pituitary FSH was studied. The estrous cycles of 16 heifers were synchronized using PGF2alpha. On Day 7 of the synchronized cycle, half of the animals were injected with 320 mg sustained-release formulated rbGH, while the other half received 10 ml saline. Five days later, all heifers were given a decreasing-dose regimen of twice daily injections of oFSH for 4 d, incorporating an injection of PGF2alpha with the fifth FSH treatment, to induce superovulation. All animals were artificially inseminated twice with semen from the same bull during estrus. Ova/embryos were recovered nonsurgically on Days 6 to 8 of the following estrous cycle, and the ovulation rate assessed on Day 9 by laparoscopy. Using the same animals as described above, the experiment was repeated twice, 3 and 6 mo later, with no laparoscopy in the third experiment. The animals were randomized both between experiments and for the day of ova/embryo collection. Pretreatment of heifers with rbGH significantly (P < 0.01) increased the number of ovulations, total number of ova/embryos recovered and the number of transferable embryos. The percentage of transferable embryos was significantly (P < 0.05) increased by rbGH pretreatment. In addition, the incidence (2/16) of follicular cysts with a poor ovulatory response (< 6 ovulations) for the rbGH-pretreated heifers was significantly lower (P < 0.05) when compared with the incidence (7/16) in the control animals. It is concluded that pretreatment with rbGH may provide a useful approach for improving superovulatory response in cattle.     

细胞寒害的热力学熵理论(Ⅱ)──超熵产生作为寒害稳定性判据的理论研究

本文从物质和能量交换的角度,运用非平衡态热力学超熵产生理论,分析了寒害定态的稳定性,并建立了超熵产生判据．理论分析所得的结论与实验结果基本相符．     

流行性出血热循环免疫复合物组分分析

应用ＳＤＳ－聚丙烯酰胺凝胶电泳及免疫转印技术对流行性出血热患才血清中免疫合物组分进行了分析。流行性出血热循环免疫复合物经ＳＤＳ－ＰＡＧＥ分离,考马斯亮兰染色,显色主要有７条带,分子量分别为２３ｋＤ,５０ｋＤ,５２ｋＤ,６５ｋＤ,７２ｋＤ,８０ｋＤ及１００ｋＤ。采用该病毒特异性抗血清、单克隆抗体以及人免疫球蛋白、补体成分抗血清识别,在其特环免疫复合物中可检出特异性病毒抗在及相应的免疫球状蛋白和补体成     

基因工程链激酶(r—SK)纯化及其单克隆抗体制备和鉴定

采用Rotofor等电聚焦和分子筛技术纯化大肠杆菌表达的重组链激酶(r—SK),其纯度为97%。比活性1×10⁶IU／mg,回收率41％。分析所纯化的r—SK　N端氨基酸顺序证实其1—15个氨基酸顺序与SK基因的核苷酸顺序所示3联密码子一致。以纯化r—SK为抗原,通过杂交瘤技术构建了分泌抗r—SK单克隆抗体(McAb)杂交瘤细胞(4D11),该McAb属IgG1亚型．特异地作用于r-SK和C组口溶血性链球菌分泌的SK。用底物显色法测定该McAb可抑制SK对纤溶酶原的激活。Western blot法证实该McAb能识别分子量为16 250Da的r—SK的CNBr裂解片段。推测SK蛋白中第71残基至第237残基间的氨基酸顺序参与SK与纤溶酶原的结合。     

抗人PAI—1单克隆抗体制备,鉴定和应用

以重组PAI-(rPAI-1)为抗原,通过杂交瘤技术获得6株阳性杂交瘤细胞(AP1、AP2、AP3、AP4、AP5和AP6),并用SPA亲和层析纯化了抗PAI-1单克隆抗体(McAb)。所有McAb均能识别rPAI和天然PAI-1,腹水滴度均为10~6以上。6种McAb对PAI-1亲和常数在3.45×10~7—1.05×10~9mol/L之间。AP2、AP3 McAb能完全抑制PAI-1活性,AP4、AP和AP6只能部分抑制PAI-1活性,AP1则不抑制PAI-1活性。6种McAb中只有AP1、AP4和AP5能识别PAI-1/t-PA复合物。利用AP1、AP3、和AP4 McAb制备免疫亲和柱一步纯化HepG_2细胞分泌的PAI-1,纯度大于98％,回收率92％,纯化倍数51倍。利用抗PAI-1 McAb建立了夹心法ELISA,测定了人血浆PAI-1水平,正常人血浆PAI-1平均含量(±D)为24.7±7.75ng/ml。     

云南阿昌族的红细胞血型分布

调查了１０２名云南阿昌族的ＡＢＯ,ＮＮＳｓ,Ｒｈ和Ｐ系统的红细胞血型,结果表明,阿昌族的基因频率ｐ（０．３８７４）是迄今国内调查过人群中的最高值,Ｅ（０．２４５９）和ＣＤｅ（０．６９３６）基因或染色体频率较高,而Ｓ（０．０６８６）和Ｐ１（０．１０８９）频率较低;Ｍｓ（０．５９５０）连锁率高于Ｎｓ（０．３３５３）;未发现ＳＳ和Ｒｈ（－Ｄ）阴性表现型。