Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete最新文献

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[Kinetics of the reaction of 2,4-dinitro-1-fluorobenzene with imidazole-SH-, and imidazole-SH-compounds]. [2,4-二硝基-1-氟苯与咪唑- sh -和咪唑- sh -化合物的反应动力学]。
R Voigt, H Wenck, F Schneider
{"title":"[Kinetics of the reaction of 2,4-dinitro-1-fluorobenzene with imidazole-SH-, and imidazole-SH-compounds].","authors":"R Voigt, H Wenck, F Schneider","doi":"10.1515/znb-1971-1011","DOIUrl":"https://doi.org/10.1515/znb-1971-1011","url":null,"abstract":"First order rate constants of the reaction of a series of SH-, imidazole- and imidazole/SH-compounds with FDNB as well as their pH- and temperature dependence were determined. Some of the tested imidazole/SH-compounds exhibit a higher nucleophilic reactivity as is expected on the basis of their pKSH-values. This enhanced reactivity is caused by an activation of the SH-groups by a neighbouring imidazole residue. The pH-independent rate constants were calculated using the Lindley equation. The kinetics of DNP-transfer from DNP-imidazole to SH-compounds were investigated. The pH-dependence of the reaction displays a maximum curve. Donor in this reaction is the DNP-imidazolecation and acceptor the thiolate anion. The reaction rate of FDNB with imidazole derivatives is two to three orders of magnitude slower than with SH-compounds. No inter- or intra-molecular transfer of the DNP-residue from sulfure to imidazole takes place.","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 10","pages":"1010-6"},"PeriodicalIF":0.0,"publicationDate":"1971-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-1011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15506903","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: 2
[Relationship between content of N-acetylneuraminic acid and tumour age in the Zajdela ascites hepatoma]. [Zajdela腹水型肝癌n -乙酰神经氨酸含量与肿瘤年龄的关系]。
W Krüger
{"title":"[Relationship between content of N-acetylneuraminic acid and tumour age in the Zajdela ascites hepatoma].","authors":"W Krüger","doi":"10.1515/znb-1971-1033","DOIUrl":"https://doi.org/10.1515/znb-1971-1033","url":null,"abstract":"","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 10","pages":"1078-9"},"PeriodicalIF":0.0,"publicationDate":"1971-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-1033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15506916","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
[Embryotoxic acitivity of N-phthaloyl-DL-isoglutamine]. [n -邻苯二甲酰- dl -异谷氨酰胺的胚胎毒性活性]。
W Meise, F Köhler
{"title":"[Embryotoxic acitivity of N-phthaloyl-DL-isoglutamine].","authors":"W Meise, F Köhler","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 10","pages":"1081-2"},"PeriodicalIF":0.0,"publicationDate":"1971-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15506918","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
[A biological active peptide in the skin of lampreys (Eudontomyzon danfordi vladykovi)]. [七鳃鳗皮肤中的一种生物活性肽]。
G Fischer, W Albert
{"title":"[A biological active peptide in the skin of lampreys (Eudontomyzon danfordi vladykovi)].","authors":"G Fischer, W Albert","doi":"10.1515/znb-1971-1013","DOIUrl":"https://doi.org/10.1515/znb-1971-1013","url":null,"abstract":"","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 10","pages":"1021-3"},"PeriodicalIF":0.0,"publicationDate":"1971-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-1013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15506905","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: 1
[Determination of particle size by gel chromatography with sepharose 6B]. [用凝胶色谱法测定葡聚糖6B的粒径]。
W Gerlich
{"title":"[Determination of particle size by gel chromatography with sepharose 6B].","authors":"W Gerlich","doi":"10.1515/znb-1971-1017","DOIUrl":"https://doi.org/10.1515/znb-1971-1017","url":null,"abstract":"","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 10","pages":"1040-4"},"PeriodicalIF":0.0,"publicationDate":"1971-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-1017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15506908","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: 3
Synthesis of rRNA, tRNA and other RNA-species concomitant with polyribosome formation in aging potato tuber slices. 老化马铃薯块茎中伴随多核糖体形成的rRNA、tRNA和其他rna物种的合成。
G Kahl
{"title":"Synthesis of rRNA, tRNA and other RNA-species concomitant with polyribosome formation in aging potato tuber slices.","authors":"G Kahl","doi":"10.1515/znb-1971-1022","DOIUrl":"https://doi.org/10.1515/znb-1971-1022","url":null,"abstract":"One of the earliest consequences of slicing plant storage organs such as potato tubers into thin disks is the formation of polysomes, which in potato slices is complete after 9 hours and is dependent on transcription. Fresh disks do not incorporate 32P, 3H-uridine or 14C-leucine into their ribosomes, whereas ribosomes and polysomes of aged disks use these precursors effectively. This development can be completely blocked by actinomycin D. Among the different RNAs synthesized during aging is 28S- and 16S—rRNA, 5S—RNA, tRNA, and a component sedimenting around 15—18S with a base-composition different from 16S—rRNA, 5S- and 4S—RNA and which supports peptide formation in an in vitro incorporation system. It is suggested that this compound represents mRNA, which is not available immediately after slicing the tissue. These findings are consistent with the view of a derepression phenomenon in sliced storage tissue.","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 10","pages":"1058-64"},"PeriodicalIF":0.0,"publicationDate":"1971-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-1022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15506912","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: 28
[No penicilloyl-substitution during reaction of penicillinase from Staphylococcus aureus with penicillin G]. [金黄色葡萄球菌青霉素酶与青霉素G反应过程中未发现青霉素取代]。
R Bingöl, W Schaeg, H Blobel
{"title":"[No penicilloyl-substitution during reaction of penicillinase from Staphylococcus aureus with penicillin G].","authors":"R Bingöl, W Schaeg, H Blobel","doi":"10.1515/znb-1971-1034","DOIUrl":"https://doi.org/10.1515/znb-1971-1034","url":null,"abstract":"","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 10","pages":"1080"},"PeriodicalIF":0.0,"publicationDate":"1971-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-1034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15506917","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
Uptake of polynucleotides by mouse ascites tumor cells. X. pH-dependent uptake of synthetic homoribopolymers. 小鼠腹水肿瘤细胞对多核苷酸的摄取。合成均聚物的ph依赖性摄取。
P L Schell
{"title":"Uptake of polynucleotides by mouse ascites tumor cells. X. pH-dependent uptake of synthetic homoribopolymers.","authors":"P L Schell","doi":"10.1515/znb-1971-1031","DOIUrl":"https://doi.org/10.1515/znb-1971-1031","url":null,"abstract":"","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 10","pages":"1074-6"},"PeriodicalIF":0.0,"publicationDate":"1971-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-1031","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15506914","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
[Phosphatidyl glycerol antiserum and its reactions with chloroplasts]. [磷脂酰甘油抗血清及其与叶绿体的反应]。
A Radunz
{"title":"[Phosphatidyl glycerol antiserum and its reactions with chloroplasts].","authors":"A Radunz","doi":"10.1515/znb-1971-0912","DOIUrl":"https://doi.org/10.1515/znb-1971-0912","url":null,"abstract":"By immunisation of rabbits with stroma-freed chloroplasts and other preparations of the lamellar system, antibodies to phosphatidyl glycerol were formed. By injection of phosphatidyl glycerol, bound to methylated bovine serum albumin, the rabbits also reacted with the formation of antibodies to this phosphatide. The antiserum to phosphatidyl glycerol yielded no reactions with phosphatidyl choline and the glycolipids sulphoquinovosyl diglyceride and mono- and digalactosyl diglyceride, which are present in chloroplasts. Stroma-freed chloroplasts from Antirrhinum majus and Nicotiana tabacum were not agglutinated by antisera to phosphatidyl glycerol. By means of the Coombs test, the “mixed-antigen-agglutination” and sateration experiments it was possible to demonstrate that antibodies to phosphatidyl glycerol are specifically adsorbed onto stroma-freed chloroplasts. After partial protein decomposition by proteases, stroma-freed chloroplasts were agglutinated. Fragments of the thylakoid membranes (ultrasonic supernatant) were precipitated only after partial protein decomposition and functioned in the Coombs test just like stroma-freed chloroplasts. However, fragments of the lamellar system (ultrasonic sediment) were directly agglutinated. Isolated chloroplasts in tris buffer-sucrose solution and in tris buffer-sodium chloride solution were equally agglutinated by antiserum to phosphatidyl glycerol. From the experiments it is concluded that the antigen determinants of the phosphatidyl glycerol are located on the antibody-accessible surface of the thylakoids. The agglutination of stroma-freed chloroplasts was, however, sterically hindered by membrane proteins. In those cases in which chloroplast preparations were directly agglutinated, it is assumed that either thylakoids were disrupted or that they were swollen, resulting in a change in the protein layer of the membranes in such a way that no steric hindrance occurs.","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 9","pages":"916-9"},"PeriodicalIF":0.0,"publicationDate":"1971-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-0912","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15505772","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: 16
Validity of a linear Hammett plot for the stability of some carcinogenic 1-aryl-3,3-dimethyltriazenes in an aqueous system. 一些致癌的1-芳基-3,3-二甲基三氮在水体系中稳定性的线性哈米特图的有效性。
G F Kolar, R Preussmann
{"title":"Validity of a linear Hammett plot for the stability of some carcinogenic 1-aryl-3,3-dimethyltriazenes in an aqueous system.","authors":"G F Kolar, R Preussmann","doi":"10.1515/znb-1971-0919","DOIUrl":"https://doi.org/10.1515/znb-1971-0919","url":null,"abstract":"The stability of fourteen carcinogenic 1-aryl-3,3-dimethyltriazenes to hydrolysis in 0.15 ᴍ phosphate buffer, pH 7.0, at 37° was determined spectroscopically. The data gave an unexpectedly wide span of half-lives resulting in a linear Hammett plot with a reaction constant, ρ= -4.7. These results are in complete agreement with the currently accepted mechanisms of carcinogenic activity associated with this class of compounds. The rapid liberation of a diazonium cation from the labile triazenes (t½, less than 2 × 102 min) seems to be responsible for the induction of local tumours; however, an enzymic activation is necessary for the systemic carcinogenic activity of the compounds stable to hydrolysis (t½, more than 2 × 102 min). Convincing experimental evidence is thus provided for two different mechanisms of activity which are operative within a single class of chemical carcinogens.","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 9","pages":"950-3"},"PeriodicalIF":0.0,"publicationDate":"1971-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-0919","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15505778","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: 30
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