检索结果-内蒙古大学图书馆

MULTIPLE MOLECULAR fORMS Of XANTHINE DEHYDROGENASE AND RELATED ENZYMES .2. CONVERSION Of ONE fORM Of XANTHINE DEHYDROGENASE TO ANOTHER BY EXTRACTS Of DROSOPHILA MELANOGASTER

引用

BIOCHIMICA ET BIOPHYSICA ACTA 1968年第2期160卷 178-&页

作者： SHINODA, T GLASSMAN, E Department of Biochemistry and The Genetics Curriculum The University of North Carolina Chapel Hill N.C. U.S.A.

1. 1. Xanthine dehydrogenase of Drosophila melanogaster exists predominantly as one form, XDH-I, in fresh homogenates. However, a second form, XDH-II, is found in partially purified extracts. The two forms of xanthine dehydrogenase are separable on DEAE-cellulose columns and by polyacrylamide gel electrophoresis indicating that each has a different charge. XDH-I sediments slightly faster than XDH-II during sucrose gradient centrifugation indicating a small difference in molecular weight or in conformation. Other properties of the molecules are not too different. 2. 2. XDH-I can be converted to a form like XDH-II by incubation with appropriate Drosophila extracts. Preliminary analysis indicates that the converter molecule has the properties of a large protein. 3. 3. The properties of XDH-II mimic the properties of xanthine dehydrogenase from flies grown on a high protein diet. These flies also have 3- to 5-fold levels of xanthine dehydrogenase activity but no increase in xanthine dehydrogenase antigenicity (cross-reacting material against xanthine dehydrogenase antibody). It is tempting to speculate that the conversion of XDH-I to XDH-II studied in this paper represents an process in vitro related to the regulation in vivo of xanthine dehydrogenase in Drosophila.

关键词： XDH-I one form of xanthine dehydrogenase XDH-II another form of xanthine dehydrogenase OR the Oregon-R wild type strain of D. melanogaster PAC the Pacific wild type strain of D. melanogaster Pm a strain of D. melanogaster containing Pm Sb/Xa ma − l a strain containing v f Bx 3 ma − l ry a strain containing st ry

来源：评论

学校读者我要写书评

暂无评论

BETA-GALACTOSIDASE INDUCTION IN CELLS Of ESCHERICHIA COLI NOT UTILIZING GLUCOSE

引用

BIOCHIMICA ET BIOPHYSICA ACTA 1967年第1期134卷 188-+页

作者： GERSHANOVITCH, VN BOURD, GI JUROVITZKAYA, NV SKAVRONS.AG KLYUTCHOVA, VV SHABOLENKO, VP Laboratory of Biochemical Genetics of Bacteria The Gamaleya Institute for Epidemiology and Microbiology Academy of Medical Sciences Moscow U.S.S.R. Laboratory of Bacterial Genetics The Gamaleya Institute for Epidemiology and Microbiology Academy of Medical Sciences Moscow U.S.S.R.

来源：评论

学校读者我要写书评

暂无评论

A STUDY Of NUCLEAR ISOMERS WHICH DECAY BY SPONTANEOUS fISSION

引用

NUCLEAR PHYSICS 1966年第2期89卷 267-+页

作者： BRENNER, DS WESTGAARD, L BJORNHOLM, S The Niels Bohr Institute University of Copenhagen Denmark

Data are presented for the pulse-height distribution of fission fragments which results from the spontaneous fission decay of the 14 ms 242 Am isomer, indicating a normal asymmetric yield-mass distribution for the fragments. The partial cross section for production of the isomer by 12 MeV deuteron bombardment of 242 Pu and the spontaneous fission half-life are determined to be 8±3 μ b and 16.7±1.5 ms, respectively. A search was made for isomers which decay by spontaneous fission produced in deuteron bombardments of 232 Th, 235 U, 238 U, 239 Pu, 241 Am and 243 Am and proton bombardment of 243 Am. Upper limits are established for spontaneous fission decay with half-lives in the ranges 10–20 μ s to 1 h. A comparison is made between experimental data from deuteron bombardments of 242 Pu and the results of calculations based on the compound-statistical model.

关键词： NUCLEAR REACTIONS 242 Pu(d, 2n), (d, f), E = 12 MeV measured σ f (delayed)/ σ f (prompt). Enriched target 232 Th, 235 U, 239 Pu, 241 Am, 243 Am(d, x n)(d, f), E = 12 MeV 243 Am(p, x n)(p, f), E = 13 MeV measured upper limits σ f (delayed)/ σ f (prompt). Enriched targets RADIOACTIVITY 242 Am isomer [from 242 Pu(d, 2n)] measured T ½ (sf), E fragment -spectrum. Enriched target

来源：评论

学校读者我要写书评

暂无评论

The biosynthesis of prostaglandins

引用

BBA - General Subjects 1964年第1期90卷 204-207页

作者： Van Dorp, D.A. Beerthuis, R.K. Nugteren, D.H. Vonkeman, H. Unilever Research Laboratory Vlaardingen Netherlands

来源：评论

学校读者我要写书评

暂无评论

Participation of anhydroleucovorin in the hydroxymethyl tetrahydrofolic dehydrogenase system

引用

BBA - Biochimica et Biophysica Acta 1957年第3期26卷 646-647页

作者： Osborn, M.J. Huennekens, f.M. Department of Biochemistry University of Washington Seattle WA United States

来源：评论

学校读者我要写书评

暂无评论

PRECISION HALf-LIfE MEASUREMENTS Of 14 POSITION-EMITTING NUCLEI

引用

NUCLEAR PHYSICS 1965年第3期61卷 479-&页

作者： EBREY, TG GRAY, PR Phillips Petroleum Company Bartlesville Oklahoma USA

Precision half-lives have been measured for fourteen positon-emitting nucleides. The weighted average half-lives are N 13 , 9.96±0.02 min; f 18 109.87±0.12 min; P 3c , 2.49±0.01 min; Cl 34m , 31.99±0.05 min; K 38 , 7.70±0.02 min; fe 53 , 8.51±0.02 min; Ni 57 , 35.99±0.12 h; Cu 62 , 9.76±0.02 min; Ga 68 , 68.33±0.09 min; Mo 91 , 15.49±0.01 min; Ag 106 , 23.96±0.04 min; Ag 108 , 2.41±0.02 min; Sb 120 , 15.89±0.04 min; and Pr 140 , 3.39±0.01 min.

关键词： RADIOACTIVITY N 13 f 18 P 30 Cl 34 K 38 fe 53 Ni 57 Cu 62 Ga 68 Mo 91 Ag 106 Ag 108 Sb 120 Pr 140 [from (Z A+1) (n 2n) except N 13 Ag 108 ] measured T 1 2 natural targets except K 39 Cu 63 ∣

来源：评论

学校读者我要写书评

暂无评论

fIBROUS STRUCTURES WITHIN MATRIX Of DEVELOPING CHICK EMBRYO MITOCHONDRIA

引用

EXPERIMENTAL CELL RESEARCH 1962年第2期26卷 424-+页

作者： NASS, MMK NASS, S The Wenner-Gren Institute for Experimental Biology University of Stockholm Sweden

An electron microscopical investigation of mitochondria from many regions of chick embryos from unincubated blastoderm through head process stages has revealed the presence of a characteristic fibrous material within the mitochondria. Various fixation techniques and electron "strains" were used, and thus far alkalinized lead acetate and uranyl acetate were particularly effective in increasing the contrast of this material. The fibers are more diffuse in stages prior to the primitive streak stage, when they become dense rods of 50-100 A diameter with some fibers extending towards the periphery of the mitochondrion from the central core. The fibrous material is characteristically observed within an area of the mitochondrial matrix which is very electron lucid. from a survey of the literature and the staining properties thus far studied it is suggested that the material may be related to deoxyribonucleic acid.

关键词： M mitochondrion f mitochondrial rods and fibers V large vesicular body containing some electron-dense material

来源：评论

学校读者我要写书评

暂无评论

The organization of pallidosubthalamic fibers in the monkey

引用

Brain Research 1968年第3期11卷 522-559页

作者： Carpenter, Malcolm B. fraser, Richard A.R. Shriver, Joyce E. Department of Anatomy College of Physicians and Surgeons Columbia University New York NY United States

A study was made to determine the topographical organization of pallido-subthalamic fibers in the rhesus monkey. Streotaxic lesions were produced in: (1) the lateral pallidal segment (12 lesions in 10 animals), (2) the medial pallidal segment (6 lesions in 6 animals), and (3) both pallidal segments (4 lesions in 4 animals). Degeneration resulting from these lesions was studied in transverse, horizontal and sagittal sections stained by the Nauta and Gygax technic¹⁴. The following conclusions were drawn from this study: 1. 1. Pallidosubthalamic fibers arising in the lateral pallidal segment are topographically organized so that: (a) rostral and central regions of this segment project fibers to the rostral two-thirds of the subthalamic nucleus, and (b) rostral parts of this segment project fibers to the medial half of the subthalamic nucleus and central parts of this segment project fibers to the lateral half of the nucleus. 2. 2. Dorsal and ventral regions of the rostral and central parts of the lateral pallidal segment are organized topographically so that: (a) fibers from dorsal regions of the rostral part terminate in lateral areas of the medial half of the subthalamic nucleus, while ventral regions project to more medial parts of this half of the nucleus, and (b) dorsal and ventral regions of the central part of this pallidal segment project to corresponding dorsal and ventral regions of the subthalamic nucleus. 3. 3. Caudal parts of the lateral pallidal segment project fibers to dorsolateral regions of the caudal part of the subthalamic nucleus. 4. 4. Observations in the present study suggest that pallidosubthalamic fibers terminating in medial and caudal parts of the subthalamic nucleus probably are derived from the medial pallidal segment. The hypothesis is presented that pallidosubthalamic fibers are topographically organized so that: (a) the most medial and lateral regions of the lateral pallidal segment project fibers respectively to medial and la

关键词： AC anterior commissure III third ventricle CL subthalamic nucleus Lf lenticular fasciculus CN caudate nucleus LG lateral geniculate body f fornix OC optic chiasm GPl globus pallidus, lateral segment OT optic tract GPm globus pallidus, medial segment Ped peduncular part of internal capsule H 2 lenticular fasciculus Put putamen IC internal capsule SN substantia nigra

来源：评论

学校读者我要写书评

暂无评论

LOCUS fOR RADIATION SENSITIVITY IN ESCHERICHIA COLI B3

引用

MUTATION RESEARCH 1965年第4期2卷 297-+页

作者： GREENBERG, J Palo Alto Medical Research Foundation Palo Alto Calif. U.S.A.

The locus of the gene for radiation sensitivity in Escherichia coli BIII has been found in crosses with several K12 Hfr''s to be closely linked to the his marker. Despite the fact that BIII, a derivative of strain B, differs from the K12 donor in two radiation-sensitivity genes, only one type of radiation-resistant recombinant was observed, that resembling the donor parent.

关键词： met methionine his histidine try tryptophane thi thiamine mal maltose str streptomycin val valine UV ultraviolet light Hfr high frequency male or donor f − recipient or female for met his try and thi minus indicates inability to synthesizel for mal minus indicates inability to ferment for val str and UV r indicates resistance s indicates sensitivity HCR(−) host cell recovery negative HCR(+) host cell recovery positive

来源：评论

学校读者我要写书评

暂无评论

EffECTS Of INfUSION Of SOME PROSTAGLANDINS IN ESSENTIAL fATTY ACID-DEfICIENT AND NORMAL RATS

引用

JOURNAL Of LIPID RESEARCH 1968年第5期9卷 602-+页

作者： KUPIECKI, fP SEKHAR, NC WEEKS, JR Departments of Metabolic Research and Pharmacology The Upjohn Company Kalamazoo Michigan 49001

Infusion of 1 mg/kg per day of prostaglandin E1 (PGE1) for 2 and 7 wk failed to correct the dermal signs of essential fatty acid (EfA) deficiency in rats despite the known conversion of EfA to certain prostaglandins. PGE1 caused no significant changes in serum cholesterol, triglycerides, or phospholipids or in liver neutral lipids in EfA-deficient or normal rats. In normal rats epinephrine-induced lipolysis was greater in fat pads from infused than from untreated rats. The effect on epinephrine-induced lipo lysis was greater after the 7 week infusion than after the 2 week infusion. The 7 week infusion also lowered plasma free fatty acid (ffA) concentrations. Infusion of PGE2 and PGf2[alpha] in combination for 4 week had no significant effect on either dermal signs of EfA deficiency, lipo lysis, or plasma ffA concentrations.

关键词： prostaglandin E 1 E 2 f 2α essential fatty acid deficiency lipolysis plasma free fatty acids

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：