检索结果-南通市图书馆

CONVERSION OF ALANINE DEHYDROGENASE TO GLUTAMIC DEHYDROGENASE BY NITROUS ACID-INDUCED MUTATION IN BACILLUS SUBTILIS Ⅰ.SIMILARITIES OF THE TWO ENZYMES IN SOME PROPERTIES

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science in China,Ser.A 1963年第4期 545-556页

作者：沈善炯洪孟民陈蕙珠孔秋桐 Laboratory of Microbiology Institute of Plant Physiology Academia Sinica Shanghai

Mutant of Bacillus subtilis which contained L-glutamic dehydrogenase(GDH)with the lossof L-alanine dehydrogenase(ADH)was induced by nitrous *** ADH of the wild type andGDH of the mutant were purified about 60-fold and their properties were *** twoenzymes were found to be indistinguishable on DEAE-cellulose chromatograms and *** kinetic constants for ADH and GDH reactions were also *** only notable differencebetween these two enzymes is found in immunological *** view of the striking similarity of the two enzymes and the fairly high frequency of mutationfrom the wild type,ADH+ to the mutant,GDH+ type and vice versa by nitrous acid induction,the authors suggest that the ADH and GDH transition is due to a single point mutation.

CONVERSION OF ALANINE DEHYDROGENASE TO GLUTAMIC DEHYDROGENASE BY NITROUS ACID-INDUCED MUTATION IN BACILLUS SUBTILIS Ⅱ.THE INDUCTIVE FORMATION OF ALANINE DEHYDROGENASE IN GLUTAMIC DEHYDROGENASE-POSITIVE MUTANTS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science in China,Ser.A 1963年第4期 557-564页

作者：洪孟民陈蕙珠沈善炯孔秋桐 Laboratory of Microbiology Institute of Plant Physiology Academia Sinica Shanghai

The GDH-positive mutant,*** IRC-3-N-1,produced ADH when grown in suitablenutrient *** formation of ADH by this mutant was inductive in *** inducerfor ADH synthesis was not restricted to the substrate of the *** acid,threonine,both enantiomorphs of alanine and pyruvate were all *** the fractionation of the enzymes,GDH and the induced ADH were coexistent insame fraction and distributed almost in same *** inductive ADH was found to beindistinguishable from its constitutive form ADH of the wild type in regard to *** inductive formation of ADH did not cause a corresponding decrease of theconstitutive GDH and contrarily,inhibition of ADH synthesis did not bring about any changeof the level of the GDH in the mutant cells,the possibility that GDH was converted metaboliticallyto ADH was ruled *** the GDH-positive mutants including those of nitrous acid treatment and those of spon-taneous origin are capable of inductive synthesis of *** view of the inducibility of ADH synthesis by the GDH-positive mutants and the foregoingdata on the immunology of these two enzymes,it is assumed that the genetic transition of ADHto GDH is a result of mutation of a regulatory gene which is concerned in the synthesis of ADH.

关键词： GDH ADH CONVERSION OF ALANINE DEHYDROGENASE TO GLUTAMIC DEHYDROGENASE BY NITROUS ACID-INDUCED MUTATION IN BACILLUS SUBTILIS THE INDUCTIVE FORMATION OF ALANINE DEHYDROGENASE IN GLUTAMIC DEHYDROGENASE-POSITIVE MUTANTS

RIBONUCLEIC ACID AS A TRANSFORMING PRINCIPLE IN BACTERIA

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science in China,Ser.A 1962年第2期 233-240页

作者：沈善炯洪孟民蔡瑞珠陈蕙珠张文玲 Shanghai Institute of Microbiology Academia Sinica shanghai Shanghai Institute of Microbiology Academia Sinica

Since the discovery of the capsule transformation of pneumococcus by Griffith and the finding that the purified transforming principle has all the properties of a highly polymerized deoxyribonucleic acid (DNA) by Avery, MacLeod and McCarty, many examples of bacterial transformations have been reported and evidences have been given that the transforming

关键词： RNA RIBONUCLEIC ACID AS A TRANSFORMING PRINCIPLE IN BACTERIA DNA

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

碳纤维复合材料低成本多用途发展展望

科技资讯 2009年第22期7卷 68-69,71页

作者：李涛陈蔚成理谭纪文北京航空材料研究院北京100095

碳纤维复合材料低成本是一个主要的发展趋势。本文从发展高性价比碳纤维、制备工艺及成型技术和扩展应用领域等方面对其发展趋势进行论述。

关键词：碳纤维碳纤维树脂基复合材料碳/碳(C/C)复合材料

在线全文

学校读者我要写书评

暂无评论

铅冶炼场地粉尘重(类)金属的迁移转化

Journal of Central South University 2024年第4期31卷 1036-1049页

作者：高文艳吴凯凯陈婷李伟展陈虹任陈玥如吴昊朱锋李海东吴川薛生国 School of Metallurgy and Environment Central South UniversityChangsha 410083China Department of Science and Environmental Studies The Education University of Hong KongHong Kong 999077China Scientific Research Academy of Guangxi Environmental Protection Nanning 530000China Nanjing Institute of Environmental Sciences Ministry of Ecology and EnvironmentNanjing 210042China

粉尘是铅冶炼场地土壤重(类)金属的来源之一,但粉尘中重(类)金属的迁移转化机制尚不明确。本文系统研究了此过程中重(类)金属的地球化学行为和解离机制。实验结果表明,两类粉尘样品中Pb、Zn、Cd和As的总量和浸出均超过标准,其中,两类粉... 详细信息

粉尘是铅冶炼场地土壤重(类)金属的来源之一,但粉尘中重(类)金属的迁移转化机制尚不明确。本文系统研究了此过程中重(类)金属的地球化学行为和解离机制。实验结果表明,两类粉尘样品中Pb、Zn、Cd和As的总量和浸出均超过标准,其中,两类粉尘中约有80%的Pb、Zn为生物可利用态,底吹炉粉尘中70%以上的As为弱酸提取态,而还原烟化炉粉尘弱酸提取态的重金属为Cd,占比为60%。Pb同位素结果显示,表土中97.12%的Pb来自冶炼过程中排放的粉尘。XRD和MLA结果表明,粉尘中的主要矿物为PbSO_(4)、ZnSO_(4)和CdSO_(4),表土中的矿物主要是石英、方解石、白云石和白云母。利用地球化学模型对主要矿物进行拟合发现,在酸性条件下,Pb、Zn和Cd的解离主要依赖于硫酸盐矿物,而As的解离与氢氧化铁的吸附作用有关。

关键词：铅冶炼粉尘重(类)金属地球化学迁移化学形态污染场地

厚煤层柔模快速沿空留巷工艺在神东矿区的应用

在线全文

学校读者我要写书评

暂无评论

煤炭工程 2016年第12期48卷 1-4页

作者：陈外信田银素王志峰王富强崔石磊神华神东煤炭集团上湾煤矿内蒙古鄂尔多斯017209

针对现有沿空留巷工艺存在的施工危险性高,留巷密闭性差,留巷速度慢的问题,上湾煤矿12上308综采工作面采用新研发的沿空留巷支架配合柔模泵注混凝土沿空留巷工艺,使长280.5m,采高3.8m的工作面留巷速度达到15m/d。此沿空留巷工艺实现了... 详细信息

针对现有沿空留巷工艺存在的施工危险性高,留巷密闭性差,留巷速度慢的问题,上湾煤矿12上308综采工作面采用新研发的沿空留巷支架配合柔模泵注混凝土沿空留巷工艺,使长280.5m,采高3.8m的工作面留巷速度达到15m/d。此沿空留巷工艺实现了厚煤层工作面快速沿空留巷,满足了综采工作面全速推进的要求,且所留巷道变形量不大,应用效果良好。

关键词：厚煤层柔性模板快速沿空留巷神东矿区挡矸支架

鼻咽癌放疗后颈部残留或复发挽救性手术治疗23例临床分析

在线全文

学校读者我要写书评

暂无评论

实用癌症杂志 2007年第4期22卷 376-377页

作者：杨湘宁陈万楷潘智灵广东药学院第一附属医院耳鼻咽喉科 510080

目的观察鼻咽癌放疗后残留或复发颈部转移灶采用手术治疗的疗效及对相关问题进行探讨。方法对23例鼻咽癌患者放疗后残留或复发颈部转移灶进行手术治疗,术后随诊,切除标本送病理检查。结果3例患者手术治疗的5年生存率为52.2%,未发生严重... 详细信息

目的观察鼻咽癌放疗后残留或复发颈部转移灶采用手术治疗的疗效及对相关问题进行探讨。方法对23例鼻咽癌患者放疗后残留或复发颈部转移灶进行手术治疗,术后随诊,切除标本送病理检查。结果3例患者手术治疗的5年生存率为52.2%,未发生严重的并发症。结论鼻咽癌患者放疗后颈淋巴结残留或复发者手术治疗的术式应采用根治性颈清扫术或区域性颈清扫术较合适。

关键词：鼻咽癌残留和复发颈部转移灶手术治疗

Polymetallaynes and Molecular Metallaynes Containing Platinum,Mercury and Gold for Optoelectronic and Magnetic Applications

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2023年第17期41卷 2159-2178页

作者： chen Zhang Linli Xu wai-Yeung Wong Departmentof Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomHong Kongchina

omprehensive Summary,Polymetallaynes are a promising branch of metallopolymers,in which the introduction of metal building blocks to organic conjugated backbones leads to their unique skeletons and versatile ***,the chemical structures,geometric configurations and functional properties in these organometallic systems can be adjusted flexibly by the appropriate selection of metal centers,auxiliary ligands,or bridging *** recent years,both one-dimensional and two-dimensional polymetallaynes have attracted considerable attention owing to their excellent electronic,optical and magnetic ***,the studies on molecular metallaynes provide substantial insights for the exploration of the structure-property-activity relationships in these organometallic acetylide-containing *** recent research progress of polymeric and molecular metallaynes containing platinum,mercury and gold is discussed in this article.A series of functional properties have been realized in these acetylide-containing compounds by the rational structural design and refined synthetic strategies,leading to their emerging applications including energy conversion,nonlinear optics,data storage and memory,as well as chemo/biosensing.

关键词： Polymetallayne Molecular metallayne Metallated graphyne Platinum Mercury Gold

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

伦敦爆炸:一个医院医生的经历

英国医学杂志中文版 2005年第5期8卷 284-284页

作者： Alexander wai Ying chen 李力（译）伦敦不详

我是一名大学学院伦敦医院的心脏科住院医生.2005年7月7日星期四,8点钟我开始查房,就要结束时,医院发出了警报:'4颗炸弹爆炸,预计有多发伤伤员到达医院'.对这一消息的第一反应是震惊和不相信,而后当确认发生了重大灾难,全体工作人员投... 详细信息

我是一名大学学院伦敦医院的心脏科住院医生.2005年7月7日星期四,8点钟我开始查房,就要结束时,医院发出了警报:'4颗炸弹爆炸,预计有多发伤伤员到达医院'.对这一消息的第一反应是震惊和不相信,而后当确认发生了重大灾难,全体工作人员投入了工作,尽力救助伤员.

关键词：住院医生医院爆炸伦敦工作人员多发伤伤员