Revue canadienne de biologie experimentale最新文献

Mechanism of action of the sodium pump in vertebrate photoreceptors. 钠泵在脊椎动物光感受器中的作用机制。

Revue canadienne de biologie experimentale Pub Date : 1983-11-01

P Marroni, V Alpigiani, L Cervetto, V Torre

引用次数: 0

[Biology yesterday, today and tomorrow]. [昨天，今天和明天的生物]。

Revue canadienne de biologie experimentale Pub Date : 1983-11-01

P Pirlot

{"title":"[Biology yesterday, today and tomorrow].","authors":"P Pirlot","doi":"","DOIUrl":"","url":null,"abstract":"Throughout the history of the biological disciplines from the 18th to the 20th centuries, there has been a succession of predominating fields of interest: morphology, physiology, genetics, biochemistry, ecology and ethology, while statistics, biometry and computer sciences were developing as powerful means of imposing rigor on research. In all sciences, there is a fundamental empiricism which has often been criticized as prescientific. However, it is unavoidable, especially in biology owing to the unusual wealth and complexity of the facts to be reported. Explaining in the natural sciences first requires the discovery of relationships between facts. Biological explanation has many levels. One of the main avenues leading to true explanation is the multidisciplinary approach, which is in reality an attempt at synthesis. Another characteristic of biological work is the equilibrium between pragmatism and idealism, usually expressed as a balance between application and theory. Both modalities are necessary because of their complementarity. The emergence of ecology demonstrates this duality in the recent past. The equilibrium between theory and application should be decided by the biologists themselves, not by the funding public agencies, although competent administrators are necessary for the welfare of researchers. Applied and theoretical research should be kept separate to a large extent, even though they remain interdependent. In biology, theoretical work has suffered considerable neglect as compared to the situation in physics and chemistry. Biology has few explanatory theories and the few it possesses have often been put forward by physicists in the field of biophysics.(ABSTRACT TRUNCATED AT 250 WORDS)","PeriodicalId":79252,"journal":{"name":"Revue canadienne de biologie experimentale","volume":"42 3","pages":"295-302"},"PeriodicalIF":0.0,"publicationDate":"1983-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17741254","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

[Abstracts of papers presented at the First Biotechnology Colloquium at the University of Montreal, 25-26 March 1983]. [1983年3月25日至26日在蒙特利尔大学举行的第一届生物技术研讨会上发表的论文摘要]。

Revue canadienne de biologie experimentale Pub Date : 1983-11-01

引用次数: 0

Depopulation of lymphocyte migration sites in the lymph node by irradiation and colloidal carbon. 通过照射和胶体碳减少淋巴结淋巴细胞迁移部位的数量。

Revue canadienne de biologie experimentale Pub Date : 1983-11-01

G Sainte-Marie, F S Peng

{"title":"Depopulation of lymphocyte migration sites in the lymph node by irradiation and colloidal carbon.","authors":"G Sainte-Marie, F S Peng","doi":"","DOIUrl":"","url":null,"abstract":"The purpose of the present investigation was to examine, in the light of recent histological findings, whether irradiation and colloidal carbon can have a lymphocyte depopulating effect on preferentially particular structures of the rat lymph nodes. Normal eight-week-old Sprague-Dawley rats received a 500 R whole body irradiation or a subcutaneous injection of 0.02 ml of India ink. The animals were then sacrificed at various time-intervals. The histological analysis of the irradiated and draining nodes revealed that both treatments almost completely eliminated small lymphocytes from the affected nodal structures, except in the center of the deep cortex units. The affected structures had been predominantly populated by recirculating lymphocytes.Thus, the treatment had a rather preferential depleting effect on a node population of recirculating lymphocytes. This finding provides another possible explanation for the carbon-induced augmentation of a GVH reaction in nodes. This augmentation had previously been attributed to a stimulation by the carbon of host macrophages, which would mediate the proliferation of antigen-reactive donor cells. From our present findings, it appears that carbon, like irradiation, could act by depleting a node of recirculating lymphocytes, thereby weakening its immunological potential against the inoculated lymphocytes.","PeriodicalId":79252,"journal":{"name":"Revue canadienne de biologie experimentale","volume":"42 3","pages":"285-93"},"PeriodicalIF":0.0,"publicationDate":"1983-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17427393","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

Differentiation of bones and skeletal muscles in chick embryos cultured on albumen. 蛋白培养鸡胚骨和骨骼肌的分化。

Revue canadienne de biologie experimentale Pub Date : 1983-11-01

R Narbaitz, K Sarkar, B Fragiskos

{"title":"Differentiation of bones and skeletal muscles in chick embryos cultured on albumen.","authors":"R Narbaitz, K Sarkar, B Fragiskos","doi":"","DOIUrl":"","url":null,"abstract":"Chick embryos were cultured in hemispheric dishes containing 25 ml fresh albumen. The addition of albumen, known to the relatively poor in free calcium, increased the deficit of calcium regularly observed in embryos cultured with other methods. In spite of this, the embryos survived and differentiated adequately for prolonged periods of time. Most of the cultured embryos presented malformations of the long bones of the limbs consisting of bowing and exuberant growth of bone trabeculae in the concavity of the bend. Block staining with alizarin showed that bones were undermineralized at the time in which bending occurred. Leg muscles differentiated adequately as judged from their electron microscopical observation. It is concluded that the malformations result from the action of normal muscles on undermineralized bones. The growth of bone trabeculae at the concavity of the bend probably results from the piezoelectrical stimulus produced by the bending of the bones. The concentrations of both the ionized and bound fractions of blood calcium were significantly reduced in the cultures. The system appears to constitute an adequate model for further explorations on the effects of prolonged hypocalcemia on the differentiation of different tissues and organs.","PeriodicalId":79252,"journal":{"name":"Revue canadienne de biologie experimentale","volume":"42 3","pages":"271-7"},"PeriodicalIF":0.0,"publicationDate":"1983-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17741253","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

The structural basis of ocular accommodation in the chick. 小鸡眼部调节的结构基础。

Revue canadienne de biologie experimentale Pub Date : 1983-07-01

A M Suburo, M Marcantoni

引用次数: 0

Spectral sensitivity of rainbow trout (Salmo gairdneri). 虹鳟(Salmo gairdneri)的光谱灵敏度。

Revue canadienne de biologie experimentale Pub Date : 1983-07-01

R H Douglas

引用次数: 0

Ionized calcium determinations in the serum of chick embryos. 鸡胚血清中离子钙的测定。

Revue canadienne de biologie experimentale Pub Date : 1983-07-01

R Narbaitz, B Fragiskos