{"title":"[Experiments on the localisation of flavonoids in plastids. I. Flavonoids in etioplasts of Avena sativa L].","authors":"G Weissenböck, I Fleing, H G Ruppel","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":78857,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B. Anorganische Chemie, organische Chemie, Biochemie, Biophysik, Biologie","volume":"27 10","pages":"1216-24"},"PeriodicalIF":0.0,"publicationDate":"1972-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15508348","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}
Short (15 min) and long (1 hour or more) pulses with P32 have been compared at different developmental stages of Limnaea. In short pulses, as opposed to long-pulses, the relative percentage of 4S RNA is at a more or less constant level at all stages of development. Heavy RNA, i. e. heavier than 28S, is traceable with both short and long pulses in the uncleaved and early morula stages. Transcription of heavy RNA seems to decrease significantly immediately before mitosis. No other RNA fraction shows such a marked rhythm associated with mitosis.
{"title":"Transcription and degradation of heavy (pre 28S)RNA and 4S RNA during embryogenesis in Limnaea.","authors":"R L Brahmachary, B Mallik, P K Tapaswi","doi":"10.1515/znb-1972-1027","DOIUrl":"https://doi.org/10.1515/znb-1972-1027","url":null,"abstract":"Short (15 min) and long (1 hour or more) pulses with P32 have been compared at different developmental stages of Limnaea. In short pulses, as opposed to long-pulses, the relative percentage of 4S RNA is at a more or less constant level at all stages of development. Heavy RNA, i. e. heavier than 28S, is traceable with both short and long pulses in the uncleaved and early morula stages. Transcription of heavy RNA seems to decrease significantly immediately before mitosis. No other RNA fraction shows such a marked rhythm associated with mitosis.","PeriodicalId":78857,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B. Anorganische Chemie, organische Chemie, Biochemie, Biophysik, Biologie","volume":"27 10","pages":"1264-6"},"PeriodicalIF":0.0,"publicationDate":"1972-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1972-1027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15508353","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}
Changes caused in the PMR spectra of aqueous solutions of four pyrimidine nucleosides (uridine, deoxyuridine, cytidine and thymidine) containing benzene (0.12 molal) by the variation of concentration and temperature have been investigated. From the data obtained, the participation of the benzene molecules in the stacking of the nucleosides is deduced.
{"title":"The interaction between pyrimidine nucleosides and benzene in aqueous solution, studied by proton magnetic resonance.","authors":"H D Lüdemann","doi":"10.1515/znb-1972-1019","DOIUrl":"https://doi.org/10.1515/znb-1972-1019","url":null,"abstract":"Changes caused in the PMR spectra of aqueous solutions of four pyrimidine nucleosides (uridine, deoxyuridine, cytidine and thymidine) containing benzene (0.12 molal) by the variation of concentration and temperature have been investigated. From the data obtained, the participation of the benzene molecules in the stacking of the nucleosides is deduced.","PeriodicalId":78857,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B. Anorganische Chemie, organische Chemie, Biochemie, Biophysik, Biologie","volume":"27 10","pages":"1196-201"},"PeriodicalIF":0.0,"publicationDate":"1972-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1972-1019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15508345","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}
The effect of 5·10-7 and 5·10-6Μ IAA on K+, Cl- and SO4-- uptake by young and old Mnium gametophytes from 0.2 mM or 10 mM salt solutions has been investigated. These IAA concentrations selectively enhance K+ uptake from 0.2 mM KCl or K2SO4 in old gametophytes. IAA up to 10-5 M does not affect the membrane potential (P.D.). At 0.2 mM KCl the observed P.D. of -200 to - 220 mV is more negative than the calculated Nernst potential of +84 to +107 mV for Cl- and -136 to -157 mV for K+. These results are discussed in relation to a recent model of IAA regulation of cell elongation involving a proton extrusion pump.
{"title":"Electrochemical evidence of specific action of indole acetic acid on membranes in Mnium leeaves.","authors":"U Lüttge, N Higinbotham, C K Pallaghy","doi":"10.1515/znb-1972-1024","DOIUrl":"https://doi.org/10.1515/znb-1972-1024","url":null,"abstract":"The effect of 5·10-7 and 5·10-6Μ IAA on K+, Cl- and SO4-- uptake by young and old Mnium gametophytes from 0.2 mM or 10 mM salt solutions has been investigated. These IAA concentrations selectively enhance K+ uptake from 0.2 mM KCl or K2SO4 in old gametophytes. IAA up to 10-5 M does not affect the membrane potential (P.D.). At 0.2 mM KCl the observed P.D. of -200 to - 220 mV is more negative than the calculated Nernst potential of +84 to +107 mV for Cl- and -136 to -157 mV for K+. These results are discussed in relation to a recent model of IAA regulation of cell elongation involving a proton extrusion pump.","PeriodicalId":78857,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B. Anorganische Chemie, organische Chemie, Biochemie, Biophysik, Biologie","volume":"27 10","pages":"1239-42"},"PeriodicalIF":0.0,"publicationDate":"1972-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1972-1024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15508350","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}
{"title":"[The water and ion permeability of the protozoan cell membrane following ultraviolet irradiation].","authors":"E Hildebrand, H Stieve","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":78857,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B. Anorganische Chemie, organische Chemie, Biochemie, Biophysik, Biologie","volume":"27 10","pages":"1243-57"},"PeriodicalIF":0.0,"publicationDate":"1972-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15508351","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}
{"title":"[Fungal pigments XII. Phlegmacin and anhydrophlegmacin, new pigments from Cortinarius odorifer (agaricales)].","authors":"W Steglich, E Töpper-Petersen","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":78857,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B. Anorganische Chemie, organische Chemie, Biochemie, Biophysik, Biologie","volume":"27 10","pages":"1286-7"},"PeriodicalIF":0.0,"publicationDate":"1972-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15512626","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}
The spectrophotometric and spectrofluorometric investigations of the enzyme-substrate complex formation of p-hydroxybenzoate hydroxylase was made by the stopped-flow technique. The apparent velocity of the formation of the enzyme-substrate complex (the velocity of the absorbance change in visible and UV regions, and the velocity of the quenching of the fluorescence intensity in the FAD moiety of the holoenzyme by the substrate) was rapid enough to explain the maximal overall velocity (72 sec-1) or the activated anaerobic reduction rate (kredmax= 200 sec-1). The results were consistent with a two-step mechanism involving a rapid bimolecular association of enzyme and substrate, and a slower follow-up unimolecular process.
{"title":"Kinetic studies on the enzyme-substrate complex formation of p-hydroxybenzoate hydroxylase by the stopped-flow method.","authors":"N Higashi, H Shoun, K Yano, K Arima, K Hiromi","doi":"10.1515/znb-1972-1014","DOIUrl":"https://doi.org/10.1515/znb-1972-1014","url":null,"abstract":"The spectrophotometric and spectrofluorometric investigations of the enzyme-substrate complex formation of p-hydroxybenzoate hydroxylase was made by the stopped-flow technique. The apparent velocity of the formation of the enzyme-substrate complex (the velocity of the absorbance change in visible and UV regions, and the velocity of the quenching of the fluorescence intensity in the FAD moiety of the holoenzyme by the substrate) was rapid enough to explain the maximal overall velocity (72 sec-1) or the activated anaerobic reduction rate (kredmax= 200 sec-1). The results were consistent with a two-step mechanism involving a rapid bimolecular association of enzyme and substrate, and a slower follow-up unimolecular process.","PeriodicalId":78857,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B. Anorganische Chemie, organische Chemie, Biochemie, Biophysik, Biologie","volume":"27 10","pages":"1172-5"},"PeriodicalIF":0.0,"publicationDate":"1972-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1972-1014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15508340","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}
{"title":"[Protein binding of ecdysone in the blowfly, Caliphora erythrocephala].","authors":"G Thamer, P Karlson","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":78857,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B. Anorganische Chemie, organische Chemie, Biochemie, Biophysik, Biologie","volume":"27 10","pages":"1191-5"},"PeriodicalIF":0.0,"publicationDate":"1972-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15508344","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}
{"title":"[The prompt and delayed fluorescence of chlorophyll during photomorphogenesis of the photosynthetic systems in green plants].","authors":"R Bauer, U F Franck","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":78857,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B. Anorganische Chemie, organische Chemie, Biochemie, Biophysik, Biologie","volume":"27 10","pages":"1202-4"},"PeriodicalIF":0.0,"publicationDate":"1972-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15508346","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}
A detailed magnetic resonance investigation of the metal ion interaction with flavoquinones has been carried out with the purpose of obtaining the stoichiometry, stability and (sub) molecular structure of the complexes. The isotropic shifts of the paramagnetic chelates are analysed in terms of contact and pseudocontact contribution. It is shown that the flavoquinone-metal binding is mainly of σ-type regardless of the nature of the ion.
{"title":"Proton magnetic resonance studies of flavoquinone-metal complexes.","authors":"J Lauterwein, P Hemmerich, J M Lhoste","doi":"10.1515/znb-1972-0912","DOIUrl":"https://doi.org/10.1515/znb-1972-0912","url":null,"abstract":"A detailed magnetic resonance investigation of the metal ion interaction with flavoquinones has been carried out with the purpose of obtaining the stoichiometry, stability and (sub) molecular structure of the complexes. The isotropic shifts of the paramagnetic chelates are analysed in terms of contact and pseudocontact contribution. It is shown that the flavoquinone-metal binding is mainly of σ-type regardless of the nature of the ion.","PeriodicalId":78857,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B. Anorganische Chemie, organische Chemie, Biochemie, Biophysik, Biologie","volume":"27 9","pages":"1047-9"},"PeriodicalIF":0.0,"publicationDate":"1972-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1972-0912","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15507566","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}
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