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[Effect of (Na)e concentration on action potentials of myocardial fibers of Pseudemys]. [(Na)e浓度对大鼠心肌纤维动作电位的影响]。
Archivio di scienze biologiche Pub Date : 1977-01-01
D Lovisolo, G G Re
{"title":"[Effect of (Na)e concentration on action potentials of myocardial fibers of Pseudemys].","authors":"D Lovisolo,&nbsp;G G Re","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The occurrence, in the myocardial fibers of several vertebrates, of two components, a fast and a slow one, in the depolarizing phase of the action potential, as shown by several workers, has been tested on freshwater turtle myocardium. In order to test the dependence of the fast component on external sodium concentrations, the maximum rate of depolarization and the level of the notch between the two phases were analyzed in hyposodic solutions. No dependence was found between the height of the overshoot of the action potential and [Na]e, either in atrial or in ventricular fibers. Instead, the maximum depolarization rate and the level of the notch between the two phases showed a linear dependence on the logarithm of [Na]e. These findings support the hypothesis that the fast component is sodium-dependent, while the slow one, responsible for the reaching of the overshoot peak, does not depend on [Na]e and has a more positive equilibrium potential.</p>","PeriodicalId":8354,"journal":{"name":"Archivio di scienze biologiche","volume":"61 1-4","pages":"51-9"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11758142","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
Researches on the development of Xenopus laevis larvae fed on Tubifex tubifex. I. Presence of liposoluble vitamins in the lipid extract from Tubifex worms. 以管翅虫为食的非洲爪蟾幼虫发育的研究。管虫脂质提取物中脂溶性维生素的存在。
Archivio di scienze biologiche Pub Date : 1977-01-01
S Mina, B Dore
{"title":"Researches on the development of Xenopus laevis larvae fed on Tubifex tubifex. I. Presence of liposoluble vitamins in the lipid extract from Tubifex worms.","authors":"S Mina,&nbsp;B Dore","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Vitamin E acetate (alpha-tocopheryl acetate) and related tocopherols, vitamin A acetate (dehydroretinyl acetate), vitamin A alcohol (retinol), and cholesterol were identified by thin-layer chromatography in the lipid extract from Tubifex tubifex worms. Compounds (perhaps vitamin D precursors, or seroidal substances) absorbing short wave UV light and/or reacting with antimony trichloride were also present but not identified. The results are discussed in relation to the growth, metamorphosis and possible appearance of malformations in Xenopus laevis specimens reared on Tubifex alone or on diets integrated with Tubifex. The hypothesis of the presence of tossic substances in Tubifex as a cause of malformations in Xenopus is also discussed.</p>","PeriodicalId":8354,"journal":{"name":"Archivio di scienze biologiche","volume":"61 1-4","pages":"39-50"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11779848","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
DNA repair after UV and gamma irradiation. II. Human lymphocytes. 紫外线和射线照射后的DNA修复。2人类淋巴细胞。
Archivio di scienze biologiche Pub Date : 1976-01-01
P Perocco, P Rocchi, S Grilli, C Franceschi, G Prodi
{"title":"DNA repair after UV and gamma irradiation. II. Human lymphocytes.","authors":"P Perocco,&nbsp;P Rocchi,&nbsp;S Grilli,&nbsp;C Franceschi,&nbsp;G Prodi","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A technique of an in vitro microculture system has been set up in order to standardize DNA repair in adult human lymphocytes after ultraviolet and gamma irradiation measuring tritiated thymidine uptake. The results obtained in DNA unscheduled synthesis were different if ultraviolet or gamma rays were employed.</p>","PeriodicalId":8354,"journal":{"name":"Archivio di scienze biologiche","volume":"60 1-4","pages":"79-85"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11990125","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
Responses of simple and non-oriented cells to stimuli of variable duration in areas 17 and 18 of cat visual cortex. 猫视觉皮层17区和18区简单和非定向细胞对不同持续时间刺激的反应。
Archivio di scienze biologiche Pub Date : 1976-01-01
C Galletti, S Squatrito, M G Maioli, E Riva Sanseverino
{"title":"Responses of simple and non-oriented cells to stimuli of variable duration in areas 17 and 18 of cat visual cortex.","authors":"C Galletti,&nbsp;S Squatrito,&nbsp;M G Maioli,&nbsp;E Riva Sanseverino","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Single unitresponses to photic stimuli of variable duration were studied in the cat visual areas 17 and 18. The closed-chamber technique was used to record extracellularly impulsive electrical activity in locally anaesthetized, Flaxedil-paralyzed and artificially ventilated cats. Stimulus duration ranges between 0.020 and 10 sec, the background luminance and the intensity of stimuli being constant. We found a first group of cells which fire independently of the stimulus duration; a second group which fire in close relation to the stimulus duration in a rather wide range of values, and a third group which fire monotonously as long as the stimulus goes on. The three groups of cells are supposed to be three functionally different types of cortical cells.</p>","PeriodicalId":8354,"journal":{"name":"Archivio di scienze biologiche","volume":"60 1-4","pages":"59-65"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12233669","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
[Chromosomal proteins: histones and acid proteins]. [染色体蛋白:组蛋白和酸性蛋白]。
Archivio di scienze biologiche Pub Date : 1976-01-01
M Salvini, F Gabrielli
{"title":"[Chromosomal proteins: histones and acid proteins].","authors":"M Salvini,&nbsp;F Gabrielli","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Experimental data about the chemistry and the biology of chromosomal proteins are reviewed. Paragraphs include: aminoacid sequential data and post-translational covalent modications of histones, histone chemical differences in different tissues of the same species and in homologous organs of different species, histone synthesis subcellular localization and its association with DNA synthesis, histone synthesis transcriptional and translational control, histone synthesis during meiosis, oogenesis and early embryogenesis. The possible role of histones as controllers of gene expression is discussed and a model of primary structure of chromatine is proposed. The \"acidic proteins\" data concern the high tissue eterogenity of these proteins and their role in the steroid-hormon-controlled gene expression. The possible role of acidic proteins as general controllers of gene expression in eucariotic cells is discussed.</p>","PeriodicalId":8354,"journal":{"name":"Archivio di scienze biologiche","volume":"60 1-4","pages":"1-35"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12233664","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
Research on cholesterol, steroidal hormones and liposoluble vitamins by thin layer chromatography in some adipose organs of anuran amphibians. II. Liposoluble vitamins. 用薄层色谱法研究无脊椎两栖动物脂肪器官中胆固醇、甾体激素和脂溶性维生素。2脂溶的维生素。
Archivio di scienze biologiche Pub Date : 1976-01-01
B Dore, P Usai
{"title":"Research on cholesterol, steroidal hormones and liposoluble vitamins by thin layer chromatography in some adipose organs of anuran amphibians. II. Liposoluble vitamins.","authors":"B Dore,&nbsp;P Usai","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>By means of thin layer chromatography and selective detection, vitamin A acetate, vitamin E and vitamin E acetate, vitamin D3 and cholesterol were identified in the prepericardic body, adrenal tissue, fat bodies and testis of Bubo bufo, as well as in the prepericardic body of Rana esculenta. On the contrary, liposoluble vitamins could not be isolated from the adipose tissue occurring in the thoracic cavity of Rana esculenta, or in Bufo bufo muscles. The results are discussed in correlation with the histological structure of the prepericardic body and the presumptive identification therein of steroid hormones. Lastly, the functional analogy between the prepericardic body and fat bodies in anuran amphibians and the brown adipose tissue of mammals is also postulated.</p>","PeriodicalId":8354,"journal":{"name":"Archivio di scienze biologiche","volume":"60 1-4","pages":"37-48"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11433617","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
Structural and functional analysis of ribosome subunits isolated from mouse liver following a toxic dose of dimethylnitrosamine. 二甲基亚硝胺中毒小鼠肝脏核糖体亚基的结构和功能分析。
Archivio di scienze biologiche Pub Date : 1976-01-01
A Delpino, U Ferrini
{"title":"Structural and functional analysis of ribosome subunits isolated from mouse liver following a toxic dose of dimethylnitrosamine.","authors":"A Delpino,&nbsp;U Ferrini","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Ribosomal subunits, isolated from mouse liver after a single dose of 50 mg/Kg b. w. of DMN, have been tested for their structural and functional properties. CsCl analysis has shown that after DMN treatment no loss of structural proteins occurs in both 40 S and 60 S ribosome subunits. It has been also demonstrated that these subunits are able to synthetize in the poly-U programmed system at low Mg++ concentrations, in the presence of heterologous initiation factors, at the same efficiency as the corresponding controls.</p>","PeriodicalId":8354,"journal":{"name":"Archivio di scienze biologiche","volume":"60 1-4","pages":"49-58"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12233667","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
DNA repair after UV and gamma irradiation. I. Rat spleen cells. 紫外线和射线照射后的DNA修复。1 .大鼠脾细胞。
Archivio di scienze biologiche Pub Date : 1976-01-01
P Rocchi, P Perocco, S Grilli, G Arfellini, C Franceschi, A M Ferreri, G Prodi
{"title":"DNA repair after UV and gamma irradiation. I. Rat spleen cells.","authors":"P Rocchi,&nbsp;P Perocco,&nbsp;S Grilli,&nbsp;G Arfellini,&nbsp;C Franceschi,&nbsp;A M Ferreri,&nbsp;G Prodi","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>An in vitro microculture was set up to standardize DNA enzymatic repair in rat spleen lymphocytes after exposure to ultraviolet or gamma rays by measuring the tritiated thymidine uptake. A relation between irradiation dose and DNA repair is always observable when cell viability and scheduled DNA synthesis are taken into account. This micromethod utilizing rat spleen cells appears to be a suitable system for such a study since it permits a satisfactory evaluation of DNA repair.</p>","PeriodicalId":8354,"journal":{"name":"Archivio di scienze biologiche","volume":"60 1-4","pages":"67-77"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11990124","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
Biochemical data on subtotally hypophysectomized Xenopus laevis (Daudin) adult specimens treated or not with prolactin. 催乳素处理或未使用催乳素处理的非洲爪蟾(爪蟾)成年标本的生化数据。
Archivio di scienze biologiche Pub Date : 1976-01-01
C Giunta, G Gaudino, M R Antignano, E Villa, A Guardabassi
{"title":"Biochemical data on subtotally hypophysectomized Xenopus laevis (Daudin) adult specimens treated or not with prolactin.","authors":"C Giunta,&nbsp;G Gaudino,&nbsp;M R Antignano,&nbsp;E Villa,&nbsp;A Guardabassi","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Xenopus laevis (Daudin) adult specimens were submitted to hypophysectomy. Although the operation resulted subtotal, it served the purpose of removing the prolactin-producing cells, whereby the involvement of endogenous prolactin in osmoregulation phenomena was excluded. In the operated animals treated with ovine prolactin the following metabolic parameters, which are closely dependent upon interrenal activity, were estimated: 1) intestine alkaline phosphomonoesterase activity (E.C. 3.1.3.1); 2) liver glycogen level; 3) glucose-6-phosphatase (E.C. 3.1.3.9.) and phosphoenolpyruvate carboxykinase (E.C. 4.1.1.32.) in the liver; 4) blood glucose level; 5) blood ammonia and urea levels; 6) carbamoylphosphate synthetase activity in the liver (E.C. 2.7.2.a); 7) muscle sodium and potassium levels. The above metabolic parameters were found to be pressed by subtotal hypophysectomy and after subsequent prolactin treatment showed the tendency to go back to values similar to those of control animals.</p>","PeriodicalId":8354,"journal":{"name":"Archivio di scienze biologiche","volume":"60 1-4","pages":"87-103"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11433527","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
[Effects of medazepam on the learning of 2 different programs of light discrimination]. [美达西泮对两种不同光辨别程序学习的影响]。
Archivio di scienze biologiche Pub Date : 1974-01-01
G Cannizzaro, P M Provenzano, A Coppola, S Gianguzza, D Murgolo
{"title":"[Effects of medazepam on the learning of 2 different programs of light discrimination].","authors":"G Cannizzaro,&nbsp;P M Provenzano,&nbsp;A Coppola,&nbsp;S Gianguzza,&nbsp;D Murgolo","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":8354,"journal":{"name":"Archivio di scienze biologiche","volume":"58 1-4","pages":"27-35"},"PeriodicalIF":0.0,"publicationDate":"1974-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15267594","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
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