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Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences最新文献

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还原态磷钼钒杂多酸H 3+ n PMo 12- n )V n O 40 ( n =0,2,4)的IR和ESR研究 还原态磷钼钒杂多酸H 3+ n PMo 12- n )V n O 40 ( n =0,2,4)的IR和ESR研究
Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences Pub Date : 1988-03-10 DOI: 10.1360/ZB1988-18-3-252
曲淑华, 詹瑞云, 吴越
{"title":"还原态磷钼钒杂多酸H 3+ n PMo 12- n )V n O 40 ( n =0,2,4)的IR和ESR研究","authors":"曲淑华, 詹瑞云, 吴越","doi":"10.1360/ZB1988-18-3-252","DOIUrl":"https://doi.org/10.1360/ZB1988-18-3-252","url":null,"abstract":"本文用IR,ESR和 18 O同位素交换研究了磷钼钒杂多酸Keggin结构中不同氧键(O b ,O p ,O t )的可还原度和可交换性以及还原过程中杂多酸结构的变化。结果表明,氧键的可还原度按O b >>O p ≈O T 变化,V取代Mo对不同氧键的可还原度有明显影响:O b 增大,而O p 和O T 降低。O b ,O p ,O t 同 18 O的交换没有区別,相对地说,含钒杂多酸中的氧不如PMo 12 中的那样易于进行同位素交换。ESR谱指出,PMo 12 ( n =0)在还原过程中生成二种配位不同的Mo 5+ 离子, g 值各为此 g ⊥ A =1.971, g ∥ A =1.912和 g ⊥ B =1.965, g ∥ B =1.861,分别属于畸变八面体和四方锥体。V取代Mo后只有V的ESR谱,还原起始阶段形成VO 2+ 或V 4+ (OH)配位状态。畸变八面体的 g 值为 g ⊥ =1.983, g ∥ =1.932;最后生成含V 4+ 的畸变四面体, g ∥ =1.932。根据实验结果认为在气相催化反应中端氧(O t ,M=O)对还原电子起定域作用,而O b 则具有传递电子的作用。","PeriodicalId":223601,"journal":{"name":"Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122135567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
阿片受点不可逆部分激剂A-α-CAO的药理研究 阿片受点不可逆部分激剂A-α-CAO的药理研究
Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences Pub Date : 1988-03-10 DOI: 10.1360/ZB1988-18-3-287
李明霞, 李灵源, 李北波, 金荫昌, 仇缀百, 朱淬砺
{"title":"阿片受点不可逆部分激剂A-α-CAO的药理研究","authors":"李明霞, 李灵源, 李北波, 金荫昌, 仇缀百, 朱淬砺","doi":"10.1360/ZB1988-18-3-287","DOIUrl":"https://doi.org/10.1360/ZB1988-18-3-287","url":null,"abstract":"A-α-CAO对小鼠(icv)具有弱而短暂的镇痛作用并能拮抗吗啡(Mor)镇痛效应3—4d。未见A-α-CAO有成瘾倾向。小鼠输精管(MVD)试验表明A-α-CAO为阿片受点部分激剂,Ke为9×10 -9 mol/L。保温时间较长或剂量较大,其拮抗效应经多次冲洗仍然存在,激剂作用亦不能被纳洛酮(N x )翻转。A-α-CAO对豚鼠回肠纵肌(GPI)呈完全激剂效应,IC 50 为5.7×10 -10 mol/L,冲洗不能除去此种作用,但可被N x 翻转。在大鼠输精管(RVD)和兔输精管(RbVD)上A-α-CAO呈抗剂效应,pA 2 值分别为7.5和7.6,作用也不易被冲洗除去。A-α-CAO可抑制~3H-依托啡( 3 H-Etor)与小鼠脑勻浆P 2 制备的特异给合,IC 50 为3.2×10 -9 mol/L,冲洗6次后A-α-CAO对 3 H-Etor高亲合力结合的抑制仍达96％。","PeriodicalId":223601,"journal":{"name":"Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122159218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
固定化烟草核酮糖-1,5-二磷酸羧化酶/加氧酶的解离及重组作用 固定化烟草核酮糖-1,5-二磷酸羧化酶/加氧酶的解离及重组作用
Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences Pub Date : 1988-03-10 DOI: 10.1360/ZB1988-18-3-264
李立人, 李粹芳, 许仁邦
{"title":"固定化烟草核酮糖-1,5-二磷酸羧化酶/加氧酶的解离及重组作用","authors":"李立人, 李粹芳, 许仁邦","doi":"10.1360/ZB1988-18-3-264","DOIUrl":"https://doi.org/10.1360/ZB1988-18-3-264","url":null,"abstract":"本文将共价偶联于CNBr活化的Sepharose 4B上的烟草核酮糖-1,5-二磷酸羧化酶/加氧酶用不同浓度尿素处理后,发现2—2.5mol/L尿素可将小亚单位解离下来而大亚单位仍偶联在载体上。3mol/L以上尿素可将大亚单位8聚体,L 8 进一步解离为单体。因此,酶是通过大亚单位上的e-氨基与载体相偶联的。小亚单位的解离量与酶活性的下降呈线性相关。将解离酶的尿素浓度稀释至0.5mol/L,解离的小亚单位几乎全部结合到残缺小亚单位的固相酶上,酶的活性也接近全部恢复。重组小亚单位量与酶活性增加亦呈线性相关。结果表明:除大亚单位外,小亚单位对维持酶的活性也有重要的作用。","PeriodicalId":223601,"journal":{"name":"Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129561449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
小熊猫、黑熊、狗与大熊猫乳酸脱氢酶同工酶M 4 一级结构比较研究 小熊猫、黑熊、狗与大熊猫乳酸脱氢酶同工酶M 4 一级结构比较研究
Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences Pub Date : 1988-03-10 DOI: 10.1360/ZB1988-18-3-275
张龙翔 梁宋平
{"title":"小熊猫、黑熊、狗与大熊猫乳酸脱氢酶同工酶M 4 一级结构比较研究","authors":"张龙翔 梁宋平","doi":"10.1360/ZB1988-18-3-275","DOIUrl":"https://doi.org/10.1360/ZB1988-18-3-275","url":null,"abstract":"本文用亲和层析纯化制得的小熊猫、黑熊和狗的乳酸脱氢酶同工酶M 4 ,经实验测定和对比,它们的N-末端、C-末端与亚基分子量和大熊猫LDH-M亚基完全相同。分析对比经胰蛋白酶水解后的HPLC肽谱,发现三种动物LDH-M亚基的大多数肽段与相应的大熊猫LDH-M亚基的肽段有相同的保留时间和氨基酸组成。对其中的差异肽段进行了序列测定。通过对差异氨基酸残基的分析,发现大熊猫LDH-M亚基一级结构在四种动物中有明显的独特性,因而有理由把大熊猫在食肉目中列为独立的一科。","PeriodicalId":223601,"journal":{"name":"Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124056456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
攀西古裂谷构造带“复苏”的地球物理判据 攀西古裂谷构造带“复苏”的地球物理判据
Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences Pub Date : 1988-02-10 DOI: 10.1360/ZB1988-18-2-193
滕吉文
{"title":"攀西古裂谷构造带“复苏”的地球物理判据","authors":"滕吉文","doi":"10.1360/ZB1988-18-2-193","DOIUrl":"https://doi.org/10.1360/ZB1988-18-2-193","url":null,"abstract":"本文根据在康滇构造带中段——攀西地区的地球物理探测:重力场、磁力场(包括古地磁和航磁测量)、地热场、大地电磁测深、天然地震、古地磁与块体运动、地壳与上地幔的爆炸地震深部探测等资料,从整体上研究了攀西地区的深部结构、性质与综合地球物理场特征。结果表明,攀西构造带并不是一个已完全消亡的“古裂谷”带,也不是中、新生代以来所形成的正在盛期的现代裂谷系。而是这条“古裂谷”带由于受到临近地区岩浆活动和构造运动的多期作用与改造所形成的活动构造带——“复苏”的“古裂谷”带。","PeriodicalId":223601,"journal":{"name":"Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125594340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
鸭肝癌癌基因的研究——mht(raf)及Ha-ras 鸭肝癌癌基因的研究——mht(raf)及Ha-ras
Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences Pub Date : 1988-02-10 DOI: 10.1360/ZB1988-18-2-167
谈红, 刘超亭, 洪伟娜, 汤国英, 张素胤, 陆志祥, 蒋惠秋, 陈渊卿, 顾健人
{"title":"鸭肝癌癌基因的研究——mht(raf)及Ha-ras","authors":"谈红, 刘超亭, 洪伟娜, 汤国英, 张素胤, 陆志祥, 蒋惠秋, 陈渊卿, 顾健人","doi":"10.1360/ZB1988-18-2-167","DOIUrl":"https://doi.org/10.1360/ZB1988-18-2-167","url":null,"abstract":"本文首次报道了鸭肝癌及癌旁组织DNA对NIH 3T3及RAT-1细胞的转化活性,并获得了转化细胞株。从转化细胞株DNA分析,证明鸭肝癌和癌旁DNA的转化细胞株中均存在mht(mil或raf)和C-Ha-ras的顺序。这对进一步研究乙型肝炎病毒,化学致癌物引发鸭肝癌的分子机理提供了重要的基础。","PeriodicalId":223601,"journal":{"name":"Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114961418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hückel能量的定域分割及应用——I.广义Hückel规则及芳香性问题 Hückel能量的定域分割及应用——I.广义Hückel规则及芳香性问题
Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences Pub Date : 1988-02-10 DOI: 10.1360/ZB1988-18-2-122
张红星 江元生
{"title":"Hückel能量的定域分割及应用——I.广义Hückel规则及芳香性问题","authors":"张红星 江元生","doi":"10.1360/ZB1988-18-2-122","DOIUrl":"https://doi.org/10.1360/ZB1988-18-2-122","url":null,"abstract":"在矩和分子片断计数基础上,将Huckel总能量向矩和分子片断展开。利用已知分子的E_π计算值,在最小二乘方意义下确定展开式的系数,使分子总能量具有片断加和性意义。结果表明,各种片断能量贡献绝对值随片断增大而减小,正负号交替变化:即偶片断起稳定作用,奇片断起活化作用,称之为广义Huckel规则。以此为基础,讨论了芳香性问题,规定了参考结构条件,统一了REPE和TRE两种芳香性判据的分歧。同时也指出了REPE方案中参数化的不唯一性,讨论了它们之间的关系。","PeriodicalId":223601,"journal":{"name":"Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114704920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of descending inhibitory and facilitory effect of the orbital cortex on the electrical discharges of medial geniculate body (MGB) neurons in rabbits. 眶皮质对兔内侧膝状体(MGB)神经元放电下降抑制和促进作用的研究。
Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences Pub Date : 1988-01-10 DOI: 10.1360/YB1988-31-1-87
Feng Mz, Lu Xy, Zhou Sc
{"title":"Study of descending inhibitory and facilitory effect of the orbital cortex on the electrical discharges of medial geniculate body (MGB) neurons in rabbits.","authors":"Feng Mz, Lu Xy, Zhou Sc","doi":"10.1360/YB1988-31-1-87","DOIUrl":"https://doi.org/10.1360/YB1988-31-1-87","url":null,"abstract":"Experiments were performed on 16 rabbits immobilized with flaxedil. The recording of spontaneous discharges and the discharges of single MGB neurons caused by clicks showed that when the cerebral-orbital cortex was stimulated, of 92 MGB neurons responding to clicks, 25 units (27.2%) were inhibited, 14 units (15.2%) were facilitated, and 15 units with spontaneous discharges were completely inhibited. The topographical distribution of stimulated points with such inhibitory and facilitory effect is quite concentrated on the orbital cortex. Stimulation of two adjacent points of the orbital cortex could respectively result in different kinds of inhibitory and facilitory effect on discharges of a same MGB neuron. Due to the existence of this descending effect with a short latent period (2-3 ms), the authors have reason to believe that there might be an \"orbital cortex-MGB\" direct pathway. Moreover, application of 2% procaine to block the auditory cortex behind the rhinal sulcus (ACBRS) could abolish the facilitory effect, with a long latency, of the orbital cortex. Therefore, the influence of the orbital cortex on MGB might be also transmitted via the \"orbital-ACBRS-MGB\" circuit.","PeriodicalId":223601,"journal":{"name":"Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131353175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
蛇肌果糖1,6-二磷酸酯酶的逆反应中的磷酰化作用 蛇肌果糖1,6-二磷酸酯酶的逆反应中的磷酰化作用
Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences Pub Date : 1988-01-10 DOI: 10.1360/ZB1988-18-1-28
许根俊 胡国富
{"title":"蛇肌果糖1,6-二磷酸酯酶的逆反应中的磷酰化作用","authors":"许根俊 胡国富","doi":"10.1360/ZB1988-18-1-28","DOIUrl":"https://doi.org/10.1360/ZB1988-18-1-28","url":null,"abstract":"本文证明在蛇肌果糖1,6-二磷酸酯酶的反应体系中,若有非水磷酸受体存在,其底物果糖1,6-二磷酸的1位磷酰基能转移到这些受体上形成有机磷化合物,导致F6P的释放速度快于无机磷的释放。用~(32)P-无机正磷酸和蛇肌酶一起保温,可分离出被无机磷共价磷酰化的酶中间物。这个磷酰化中间物可能和酶的正反应催化过程有关。","PeriodicalId":223601,"journal":{"name":"Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124894029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
组胺H_1和H_2受体激动剂对多能造血干细胞(CFU-S)细胞周期状态的影响 组胺H_1和H_2受体激动剂对多能造血干细胞(CFU-S)细胞周期状态的影响
Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences Pub Date : 1988-01-10 DOI: 10.1360/ZB1988-18-1-71
徐有恒, 蒋德昭, 王绮如, 唐植春
{"title":"组胺H_1和H_2受体激动剂对多能造血干细胞(CFU-S)细胞周期状态的影响","authors":"徐有恒, 蒋德昭, 王绮如, 唐植春","doi":"10.1360/ZB1988-18-1-71","DOIUrl":"https://doi.org/10.1360/ZB1988-18-1-71","url":null,"abstract":"本实验显示组胺H_2受体激动剂4-甲基组胺可促使更多的多能造血干细胞进入细胞周期,而组胺H_1受体激动剂2-甲基组胺则能阻抑4-甲基组胺的这一作用,H_1受体阻断剂又能取消2-甲基组胺的这种阻抑作用。文中讨论了上述现象的可能机制。","PeriodicalId":223601,"journal":{"name":"Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125010467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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