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Revue canadienne de biologie最新文献

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Retinal Adaptations to Habitats 视网膜对栖息地的适应
Revue canadienne de biologie Pub Date : 1985-01-01 DOI: 10.1007/978-1-4684-9129-6_7
M. A. Ali, M. Klyne
{"title":"Retinal Adaptations to Habitats","authors":"M. A. Ali, M. Klyne","doi":"10.1007/978-1-4684-9129-6_7","DOIUrl":"https://doi.org/10.1007/978-1-4684-9129-6_7","url":null,"abstract":"","PeriodicalId":21345,"journal":{"name":"Revue canadienne de biologie","volume":"1 1","pages":"133-150"},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83156700","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: 18
[Phospholipids of pulmonary surfactants and lung elasticity]. [肺表面活性剂磷脂与肺弹性]。
Revue canadienne de biologie Pub Date : 1981-12-01
W D Seufert, G Lachiver, F Bessette
{"title":"[Phospholipids of pulmonary surfactants and lung elasticity].","authors":"W D Seufert,&nbsp;G Lachiver,&nbsp;F Bessette","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>We discuss the various preparations of substitute pulmonary surfactant that have been proposed for the treatment of Respiratory Distress Syndrome in premature infants. We than submit some experimental results demonstrating that a preparation of phospholipids in an organic solvent can simulate the behavior of the naturally occurring pulmonary surfactant as a monolayer at an air-water interface.</p>","PeriodicalId":21345,"journal":{"name":"Revue canadienne de biologie","volume":"40 4","pages":"351-8"},"PeriodicalIF":0.0,"publicationDate":"1981-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17946273","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
[Can phosphatidyl sulfocholine, the sulfonium analog of lecithin, efficiently replace lecithin in natural membranes?]. [卵磷脂的磺化类似物磷脂酰磺胆碱能有效取代天然膜中的卵磷脂吗?]。
Revue canadienne de biologie Pub Date : 1981-12-01
M Kates, P A Tremblay
{"title":"[Can phosphatidyl sulfocholine, the sulfonium analog of lecithin, efficiently replace lecithin in natural membranes?].","authors":"M Kates,&nbsp;P A Tremblay","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Lecithin does not exist in the marine diatom, Nitzschia alba, being completely replaced by phosphatidylsulfocholine (PSC), the sulfonium analogue of phosphatidylcholine (PC). Thus, the question arises: how can PSC effectively replace lecithin in a natural membrane? We have compared the physical properties of a homologous series of synthetic PSC's (di - 14:0, di- 16:0, di- 18:0, di 18:1) in aqueous dispersion with those of a similar series of PC's. The PSC's formed liposomes having similar properties to those of the PC's. However, the saturated PSC homologues showed main transition temperatures 2-4 degrees C above those of the corresponding PC's as measured by differential scanning calorimetry, fluorescence polarization or electron paramagnetic resonance. Furthermore, there was no significant difference between the two types of membranes with respect to their permeability to urea or 6-carboxyfluorescein either in the presence or absence of cholesterol. We have also shown that yeast cells can grow and survive in spite of a complete replacement of PC by PSC in their membranes. The sulfonium analogue of lecithin would appear to be able to replace PC in natural membranes because of the similarity in their physical properties.</p>","PeriodicalId":21345,"journal":{"name":"Revue canadienne de biologie","volume":"40 4","pages":"343-9"},"PeriodicalIF":0.0,"publicationDate":"1981-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18085989","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 washing gametes on their fertilization in rainbow trout]. 洗涤配子对虹鳟受精的影响
Revue canadienne de biologie Pub Date : 1981-12-01
R Billard
{"title":"[Effects of washing gametes on their fertilization in rainbow trout].","authors":"R Billard","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Isolation and washing experiments were carried out to test the respective influences of coelomic and seminal fluids on gamete fertilizing ability. Isolating or washing gametes in salt solutions similar to the accompanying medium did not alter their fertility. On the contrary, the fertilization rate was lower when ova and spermatozoa were washed before insemination. Fertilizability was considerably lower for ova washed exclusively in media with NaCl or low osmotic pressure. The paper discusses some protein factors in the coelomic and seminal fluids which may have a protector effect on gametes, especially spermatozoa.</p>","PeriodicalId":21345,"journal":{"name":"Revue canadienne de biologie","volume":"40 4","pages":"317-21"},"PeriodicalIF":0.0,"publicationDate":"1981-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18347961","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
Purification of lymphocystis disease virus (LDV) grown in tissue culture. Evidences for the presence of two types of viral particles. 组织培养淋巴囊肿病病毒(LDV)的纯化。两种病毒颗粒存在的证据。
Revue canadienne de biologie Pub Date : 1981-12-01
J Robin, L Berthiaume
{"title":"Purification of lymphocystis disease virus (LDV) grown in tissue culture. Evidences for the presence of two types of viral particles.","authors":"J Robin,&nbsp;L Berthiaume","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Lymphocystis disease virus was highly purified from host cells by precipitation with PEG-6000 and isopycnic centrifugation in a metrizamide gradient. Metrizamide gradient centrifugation produce two distinct bands at equilibrium. As calculated from reconstruction experiments, only 4 and 0.3% respectively of the host DNA and the host proteins were recovered at the position of the bands. The final recovery of infectivity was about 41%. Electron microscopy of the bands showed two types of particles: small and dense particles measuring 100-150 nm and lymphocystis virions that measured about 300-350 nm in diameter.</p>","PeriodicalId":21345,"journal":{"name":"Revue canadienne de biologie","volume":"40 4","pages":"323-9"},"PeriodicalIF":0.0,"publicationDate":"1981-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18347962","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
[Cardiovascular effects of cigarette smoke in the rat. Aortic endothelial and myocardial capillary permeability in the rat]. 吸烟对大鼠心血管的影响。大鼠主动脉内皮及心肌毛细血管通透性[j]。
Revue canadienne de biologie Pub Date : 1981-09-01
M Bazin, H Turcotte, R Lagacé, M Boutet
{"title":"[Cardiovascular effects of cigarette smoke in the rat. Aortic endothelial and myocardial capillary permeability in the rat].","authors":"M Bazin,&nbsp;H Turcotte,&nbsp;R Lagacé,&nbsp;M Boutet","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The permeability of aortic endothelium and myocardial capillaries was examined in 72 Sprague-Dawley rats (approximately 350 g) using the diffusion tracer peroxidase. Animals were subjected to cigarette smoke for periods of 1 day (acute effects), 2 weeks (sub-acute effects) and 15 weeks (chronic effects) and were sacrificed 5 minutes or 8 hours after smoking. Peroxidase was not generally present at the sub-endothelial level in the aortic endothelium of control animals and sham-smokers. However, in smokers, the increase in peroxidase permeability is proportional to the smoking period. Moreover, in these smokers we observed junctional and subendothelial vacuolar dilatations which correspond to degenerative morphologic changes. Cigarette smoke has a different effect on the right ventricle. Endothelial permeability of the myocardial capillaries increases in animals subjected to cigarette smoke for 1 day and those who smoked for 2 weeks sacrificed 5 minutes after smoking. This increase in permeability is not related to the significant morphologic changes observed in the myocardium and endothelial capillaries. However, the myocardial endothelial capillaries, the sub-endothelial space and the adjacent interstitial space were generally free of peroxidase in animals subjected to cigarette smoke for 15 weeks and in those smoking for 2 weeks sacrificed 8 hours later. An adaptive phenomenon to the effects of cigarette smoke appear to exist in the myocardial endothelium capillaries contrary to that which is observed in the thoracic aorta.</p>","PeriodicalId":21345,"journal":{"name":"Revue canadienne de biologie","volume":"40 3","pages":"263-76"},"PeriodicalIF":0.0,"publicationDate":"1981-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18324717","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
Mutagenicity of ozone relative to other chemical and physical agents in Escherichia coli K12. 臭氧对大肠杆菌K12中其它化学和物理试剂的致突变性。
Revue canadienne de biologie Pub Date : 1981-09-01
C Hamelin, L Poliquin, Y S Chung
{"title":"Mutagenicity of ozone relative to other chemical and physical agents in Escherichia coli K12.","authors":"C Hamelin,&nbsp;L Poliquin,&nbsp;Y S Chung","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":21345,"journal":{"name":"Revue canadienne de biologie","volume":"40 3","pages":"305-7"},"PeriodicalIF":0.0,"publicationDate":"1981-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18079666","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 periphery of the avian retina: specializations of the layer of ganglion cells and their axons. 鸟类视网膜外围:神经节细胞层及其轴突的特化。
Revue canadienne de biologie Pub Date : 1981-06-01
H Campaña, A Suburo
{"title":"The periphery of the avian retina: specializations of the layer of ganglion cells and their axons.","authors":"H Campaña,&nbsp;A Suburo","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Ganglion cells and their axons were studied in the retinas of chicken, quails and pigeons. Retinal flat mounts were examined with light microscopy after cresyl violet or silver impregnation procedures. Silver-impregnated specimens were also examined with scanning electron microscopy. Significant differences were observed between ganglion cells of the central region and those lying along the temporal and nasal margins of the retina. These peripheral ganglion cells formed belt-like structures where groups of cell bodies were arranged in stripes. Their axons did not make a straight course and they reached the nerve head after an arciform path. Axon bundles and stripes of cells were similarly oriented. Consequently, axons originating in the same region of the retina did not necessarily arrive to the same point of the nerve head. Both the nasal and the temporal belts contained the largest neuronal bodies found in the retina. However, there were more cellular stripes in the temporal belt than along the nasal margin. In some birds, the belts developed after hatching.</p>","PeriodicalId":21345,"journal":{"name":"Revue canadienne de biologie","volume":"40 2","pages":"187-94"},"PeriodicalIF":0.0,"publicationDate":"1981-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17234295","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
Adaptative processes in the albino rat raised under hypoxia at simulated altitude. 模拟海拔缺氧条件下白化大鼠的适应过程。
Revue canadienne de biologie Pub Date : 1981-06-01
U Quatrini, A Benigno, F Orlando
{"title":"Adaptative processes in the albino rat raised under hypoxia at simulated altitude.","authors":"U Quatrini,&nbsp;A Benigno,&nbsp;F Orlando","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Albino rats of the Wistar family were raised from the time of birth in a simulated altitude of about 6000 meters (barometric pressure 370 mm Hg) for a period of about 50 days. Part of these were killed after losing consciousness upon exposure to acute hypoxia. The other groups were killed without being first subjected to acute hypoxia. Control groups of the some stock were raised for a corresponding period of time in a normal atmosphere at sea level and killed like the preceding. We were not able to demonstrate significant variations in tolerance to acute hypoxia in the various groups studied. Instead the animals raised in a simulated altitude displayed an increase in the 2,3-DPG content in the red blood cells, Hb concentration and the number of erythrocytes for mm3 of blood. The animals raised in a simulated altitude also displayed a displacement of the acid-base balance of blood towards the acid side. This was even more accentuated in the group subjected to acute hypoxia. Finally, it was observed, via the weight curve, that the animals raised in a simulated altitude presented a slower body growth in comparison to the control group.</p>","PeriodicalId":21345,"journal":{"name":"Revue canadienne de biologie","volume":"40 2","pages":"159-66"},"PeriodicalIF":0.0,"publicationDate":"1981-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18291800","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
[Inapparent persistent chlamydial infection in McCoy cells]. McCoy细胞的隐性持续性衣原体感染。
Revue canadienne de biologie Pub Date : 1981-06-01
G Ozanne
{"title":"[Inapparent persistent chlamydial infection in McCoy cells].","authors":"G Ozanne","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>We have studied the phenomena of inapparent chlamydial infections in vitro using McCoy cells in culture as hosts and low doses of Chlamydia psittaci (GP-IC) as infecting agents. The results indicate that GP-IC can persist undetected at least 220 hrs in McCoy cells previously inoculated with 0.2 mL of a GP-IC preparation containing 30 ifu/mL, using the centrifuge-assisted inoculation technique. These cells were maintained in complete MEM medium supplemented with 2% v/v of foetal bovin serum (FBS). These inapparent chlamydial infections did not follow active infections (detectable chlamydial multiplication); however, they could be induced to active infections (formation of intracytoplasmic inclusions) by transfering the infected McCoy cells in complete MEM medium supplemented with 5% v/v of FBS and 1 microgram/mL of cycloheximide. Transfer of these cells in complete MEM medium supplemented with 5% v/v of FBS but without cycloheximide did not induce active infections indicating that nutritional competition was not implicated in these inapparent chlamydial infections since that medium usually support chlamydial multiplication.</p>","PeriodicalId":21345,"journal":{"name":"Revue canadienne de biologie","volume":"40 2","pages":"195-201"},"PeriodicalIF":0.0,"publicationDate":"1981-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18291803","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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