The effect of whole body gamma irradiation at the low exposure levels of 100, 200 and 400 r has been studied on the rate of growth of both juvenile and adult males and females of Clarias lazera. Irradiation causes, in general, significant retardation in rate of increase in length of growing fish. Such retardation is especially marked in adult females. Irradiation causes also diminution in the percentage increase in weight of adults especially the females. In juvenile fish, radiation exposure at the levels of 100 and 200 r accelerates the rate of increase in weight while the higher exposure level of 400 r results in a significant retardation. The exposure level of 100 r increases the ratio weight/length only in juveniles. Exposure levels of 200 and 400 r decrease such a ratio. The results obtained are explained in correlation with the general knowledge of biological radiation syndrome and discussed in view of the relevant literature.
{"title":"Growth rate measurements in gamma irradiated catfish.","authors":"H M Roushdy, A E Imam","doi":"10.1515/znb-1971-0922","DOIUrl":"https://doi.org/10.1515/znb-1971-0922","url":null,"abstract":"The effect of whole body gamma irradiation at the low exposure levels of 100, 200 and 400 r has been studied on the rate of growth of both juvenile and adult males and females of Clarias lazera. Irradiation causes, in general, significant retardation in rate of increase in length of growing fish. Such retardation is especially marked in adult females. Irradiation causes also diminution in the percentage increase in weight of adults especially the females. In juvenile fish, radiation exposure at the levels of 100 and 200 r accelerates the rate of increase in weight while the higher exposure level of 400 r results in a significant retardation. The exposure level of 100 r increases the ratio weight/length only in juveniles. Exposure levels of 200 and 400 r decrease such a ratio. The results obtained are explained in correlation with the general knowledge of biological radiation syndrome and discussed in view of the relevant literature.","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 9","pages":"962-7"},"PeriodicalIF":0.0,"publicationDate":"1971-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-0922","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15505780","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}
Ferredoxin (Fd) is surface active; both its area/molecule, A, and surface potential, ΔV, (at an air-water interface) vary with the pH of the subphase. From the surface isotherms (at pH 7.7) A and ΔV are 167 A2 and 170 ± 20 mV, respectively, when the surface tension is 10 dyne/cm. Fd and chlorophyll a (Chl) appear to form a mixed monomolecular film. At pH 7.7 a maximum interaction between Fd and Chl is observed when the monolayer contains a mole ratio of Fd/Chl ≅ 2. Irradiaion of Chl-Fd films, in nitrogen atmosphere, results in a bleaching of Chl and an increase of ΔV. The quantum yield for this bleaching is estimated to be 0.4.
{"title":"Interactions between ferredoxin and chlorophyll in a monolayer system.","authors":"S S Brody","doi":"10.1515/znb-1971-0914","DOIUrl":"https://doi.org/10.1515/znb-1971-0914","url":null,"abstract":"Ferredoxin (Fd) is surface active; both its area/molecule, A, and surface potential, ΔV, (at an air-water interface) vary with the pH of the subphase. From the surface isotherms (at pH 7.7) A and ΔV are 167 A2 and 170 ± 20 mV, respectively, when the surface tension is 10 dyne/cm. Fd and chlorophyll a (Chl) appear to form a mixed monomolecular film. At pH 7.7 a maximum interaction between Fd and Chl is observed when the monolayer contains a mole ratio of Fd/Chl ≅ 2. Irradiaion of Chl-Fd films, in nitrogen atmosphere, results in a bleaching of Chl and an increase of ΔV. The quantum yield for this bleaching is estimated to be 0.4.","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 9","pages":"922-9"},"PeriodicalIF":0.0,"publicationDate":"1971-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-0914","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15505773","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":"[Influence of 4-hydroxypental on oxygen uptake and the SH content of the normal rat liver and the hepatoma induced by diathylnitrosamine].","authors":"E Schauenstein, R Rindler, R Schindler, M Taufer","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 8","pages":"788-91"},"PeriodicalIF":0.0,"publicationDate":"1971-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15501510","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":"Flash photolysis of rhodopsin. II. Measurements on rhodopsin digitonin solutions and fragments of rod outer segments.","authors":"G V Sengbusch, H Stieve","doi":"10.1515/znb-1971-0830","DOIUrl":"https://doi.org/10.1515/znb-1971-0830","url":null,"abstract":"","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 8","pages":"861-2"},"PeriodicalIF":0.0,"publicationDate":"1971-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-0830","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15501521","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}
Incorporation of P32 and C14-uracil into RNase-sensitive, acid-insoluble fraction takes place in well defined cycles in course of the early cleavage in Limnaea embryos. This suggests a cyclic RNA synthesis. 40-50% less RNA is transcribed during the latter half of each cell division cycle. The rhythm is absent in the homogenate. The relevance of the findings has been discussed.
{"title":"Rhythmic incorporation of P 32 and C 14 -uracil in early mitotic cycles of Limnaea (mollusc) eggs.","authors":"R L Brahmachary, D Ghosal, P K Tapaswi","doi":"10.1515/znb-1971-0817","DOIUrl":"https://doi.org/10.1515/znb-1971-0817","url":null,"abstract":"Incorporation of P32 and C14-uracil into RNase-sensitive, acid-insoluble fraction takes place in well defined cycles in course of the early cleavage in Limnaea embryos. This suggests a cyclic RNA synthesis. 40-50% less RNA is transcribed during the latter half of each cell division cycle. The rhythm is absent in the homogenate. The relevance of the findings has been discussed.","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 8","pages":"822-4"},"PeriodicalIF":0.0,"publicationDate":"1971-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-0817","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15501517","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 new equation for microbial growth has been proposed and its implications discussed. The proposed equation has a distinct advantage over Bertalanffy’s in being an explicit relationship between growth parameter and time. Attempt has been made to read the proposed equation in the light of Hinshelwood’s auto-synthetic model. The constants occurring in the proposed equation have been shown to be intimately related to the kinetic constants in the Hinshelwood’s model.
{"title":"A new equation for microbial growth.","authors":"R C Srivastava, P K Avasthi","doi":"10.1515/znb-1971-0814","DOIUrl":"https://doi.org/10.1515/znb-1971-0814","url":null,"abstract":"A new equation for microbial growth has been proposed and its implications discussed. The proposed equation has a distinct advantage over Bertalanffy’s in being an explicit relationship between growth parameter and time. Attempt has been made to read the proposed equation in the light of Hinshelwood’s auto-synthetic model. The constants occurring in the proposed equation have been shown to be intimately related to the kinetic constants in the Hinshelwood’s model.","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 8","pages":"804-6"},"PeriodicalIF":0.0,"publicationDate":"1971-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-0814","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15501514","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":"Differences in regulation between rat liver and kidney tyrosine aminotransferases.","authors":"R Hardeland","doi":"10.1515/znb-1971-0827","DOIUrl":"https://doi.org/10.1515/znb-1971-0827","url":null,"abstract":"","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 8","pages":"858"},"PeriodicalIF":0.0,"publicationDate":"1971-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-0827","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15501520","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":"[A system theoretic model for biogenesis].","authors":"O E Rössler","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 8","pages":"741-6"},"PeriodicalIF":0.0,"publicationDate":"1971-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15501508","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}
Interrelations between energy metabolism and cell division were studied with permanent in vitro cultured Ehrlich-ascites-tumor-cells during the second passage in vitro. The following parameters were estimated under aerobic and anaerobic conditions and in the presence of dinitrophenol: DNA- and RNA-synthesis measured by the incorporation of 14C-thymidine and 14C-uridine; rate of glycolysis measured by lactate production; permeation of 14C-2-aminoisobutyric acid; ATP level of the cells; cell division and number of dead cells. The following results were obtained: Cell division and thymidine incorporation are obligate oxygen dependent processes. It was not possible to decide, whether respiration alone can maintain cell propagation. Respiration alone and glycolysis alone cannot maintain a normal level of ATP. Only an intact respiration can maintain the penetration of 2-aminoiso-butyric acid. Glycolysis alone and respiration alone can supply the energy for the incorporation of uridine. The incorporation of uridine is also influenced by oxygen dependent reactions not related to energy production. The number of dead cells does not rise significantly under anaerobic conditions.
{"title":"[Cell division and energy dependent metabolic power of Ehrlich-ascites-tumor cells under aerobic and anaerobic conditions].","authors":"H P Krause, H Probst, F Schneider","doi":"10.1515/znb-1971-0810","DOIUrl":"https://doi.org/10.1515/znb-1971-0810","url":null,"abstract":"Interrelations between energy metabolism and cell division were studied with permanent in vitro cultured Ehrlich-ascites-tumor-cells during the second passage in vitro. The following parameters were estimated under aerobic and anaerobic conditions and in the presence of dinitrophenol: DNA- and RNA-synthesis measured by the incorporation of 14C-thymidine and 14C-uridine; rate of glycolysis measured by lactate production; permeation of 14C-2-aminoisobutyric acid; ATP level of the cells; cell division and number of dead cells. The following results were obtained: Cell division and thymidine incorporation are obligate oxygen dependent processes. It was not possible to decide, whether respiration alone can maintain cell propagation. Respiration alone and glycolysis alone cannot maintain a normal level of ATP. Only an intact respiration can maintain the penetration of 2-aminoiso-butyric acid. Glycolysis alone and respiration alone can supply the energy for the incorporation of uridine. The incorporation of uridine is also influenced by oxygen dependent reactions not related to energy production. The number of dead cells does not rise significantly under anaerobic conditions.","PeriodicalId":23706,"journal":{"name":"Zeitschrift fur Naturforschung. Teil B, Chemie, Biochemie, Biophysik, Biologie und verwandte Gebiete","volume":"26 8","pages":"780-8"},"PeriodicalIF":0.0,"publicationDate":"1971-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1971-0810","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15501509","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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