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Biological structures and morphogenesis最新文献

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The chicken blastoderm: in vitro methods of investigation of developmental processes. 鸡胚皮发育过程的体外研究方法。
Biological structures and morphogenesis Pub Date : 1989-01-01
F Harrisson, L Vakaet
{"title":"The chicken blastoderm: in vitro methods of investigation of developmental processes.","authors":"F Harrisson,&nbsp;L Vakaet","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A brief description of the structure and a critical survey of the methods of explantation, cultivation, and experimental manipulation of chicken blastoderms are presented. Special attention has been paid to those methods that have enabled major developments in cell and developmental biology of gastrulation. The data suggest that the chicken blastoderm is an appropriate system for the study of developmental processes that are often analogous to medical problems.</p>","PeriodicalId":77037,"journal":{"name":"Biological structures and morphogenesis","volume":"2 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13804200","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
Ultimobranchial body and parathyroid gland of the frog, Rana tigrina in response to calcitonin administration. 降钙素对蛙的鳃末体和甲状旁腺的影响。
Biological structures and morphogenesis Pub Date : 1989-01-01
A K Srivastav, L Rani
{"title":"Ultimobranchial body and parathyroid gland of the frog, Rana tigrina in response to calcitonin administration.","authors":"A K Srivastav,&nbsp;L Rani","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The effects of salmon calcitonin (0.25 MRC mU/g body wt) on the serum calcium and phosphate levels as well as on the activity of ultimobranchial body and parathyroid glands was investigated in the frog, Rana tigrina for 15 days. The hormone evokes hypocalcemia (on day 1 and day 3) which is followed by a significant hypercalcemia on day 10. Thereafter, the level of calcium decreases again on day 15. Calcitonin induces hypophosphatemia (on day 3 and day 5). Thereafter, hyperphosphatemia is recorded on day 10. By day 15 normal serum phosphate value is achieved. After treatment with calcitonin, the ultimobranchial body becomes inactive and the parathyroid glands get activated.</p>","PeriodicalId":77037,"journal":{"name":"Biological structures and morphogenesis","volume":"2 4","pages":"136-40"},"PeriodicalIF":0.0,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13631500","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 pure chick embryo epidermis grown in primary serum-free culture. 原代无血清培养中纯鸡胚表皮的分化。
Biological structures and morphogenesis Pub Date : 1989-01-01
J M Verna, A Fichard, R Saxod
{"title":"Differentiation of pure chick embryo epidermis grown in primary serum-free culture.","authors":"J M Verna,&nbsp;A Fichard,&nbsp;R Saxod","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The differentiation of precocious embryonic epidermis in serum-free primary culture was analyzed by light and electron microscopic methods. Explants of 7-day chick embryo epidermis were grown on collagen or poly-L-lysine substrates in the absence of dermal mesenchyme. The serum substitute consisted of a mixture of insulin, transferrin, putrescine and seleneous acid together with (or without) Nerve Growth Factor. These culture conditions were shown to support proliferation, growth and development (evaluated using morphological criteria) of the epidermal explants up to 4-5 days; during this period, the epidermis underwent stratification; well-developed desmosomes as well as tonofilaments were formed and the epidermis achieved a morphology close to that of 10-11 day epidermis in ovo. However long-term survival of the explants was not obtained as cellular death, starting on day 5, progressively led to the necrosis of most parts of the explant. This morphological study demonstrates that the early phases of epidermal growth and maturation can occur to some extent in the virtual absence of dermal elements and serum factors. Chick embryo epidermal cells may thus possess the intrinsic ability to go through, at least for short periods in vitro, their differentiation programme. Then, at the onset of epidermal keratinization (12 days in ovo), they require specific exogenous factors to fully differentiate in vitro.</p>","PeriodicalId":77037,"journal":{"name":"Biological structures and morphogenesis","volume":"2 2","pages":"60-6"},"PeriodicalIF":0.0,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13734696","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 effect of maternal Naja nigricollis envenomation on the placenta. An experimental study. 母体黑螺旋体毒杀对胎盘的影响。一项实验性研究。
Biological structures and morphogenesis Pub Date : 1989-01-01
N N Nawar, A H Mohamed, N Adieb, M Emad
{"title":"The effect of maternal Naja nigricollis envenomation on the placenta. An experimental study.","authors":"N N Nawar,&nbsp;A H Mohamed,&nbsp;N Adieb,&nbsp;M Emad","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The effect of maternal envenomation with N. nigricollis venom on the placental tissues was studied in mice. The venom seemed to exert a direct toxic effect on the constituent parts of the placenta. Glycogen appeared to advantage in the cells of the trophospongeal part of the placenta. Giant cells and basophilic cells were encountered around such glycogen cells. However, some giant cells showed vacuolation of the cytoplasm and pyknosis of the nuclei. The labyrinthine part of the placenta showed large and multiple small thrombi and congestion of the blood spaces. Again glycogen appeared to advantage in the syncytial cells. Non cellular exudate was also met with in such cases. The possible mechanisms of these changes were discussed.</p>","PeriodicalId":77037,"journal":{"name":"Biological structures and morphogenesis","volume":"2 1","pages":"13-7"},"PeriodicalIF":0.0,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13883278","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
Acetylcholinesterase-positive intrapineal neuronal system in the palm squirrel Funambulus pennanti (Wroughton). 棕榈松鼠脑内神经元系统乙酰胆碱酯酶阳性研究。
Biological structures and morphogenesis Pub Date : 1989-01-01
K S Bhaskar, K P Joy
{"title":"Acetylcholinesterase-positive intrapineal neuronal system in the palm squirrel Funambulus pennanti (Wroughton).","authors":"K S Bhaskar,&nbsp;K P Joy","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A well-developed acetylcholinesterase (AChE)-positive neuronal system could be demonstrated in the pineal organ of the palm squirrel. There are two longitudinal nerve tracts which run all along the margin of the pineal organ from its distal to proximal regions. These nerve tracts are confluent distally. Another short, but deep tract was seen in the middle part of the pineal organ which joins one of these tracts. A large number of AChE-positive neurons whose processes actually form the tracts are present all along the pineal organ. They are distinguished into multipolar and pseudounipolar/unipolar neurons. A few neurons seen outside the nerve tract form a network of nerve fibres among the pinealocytes and also link the main tracts. The nerve tracts appear wavy, irregular and tortuous. A large number of round ring-like bodies seen in close association with neuronal perikarya and nerves may represent the axo-somatic and axo-dendritic contacts.</p>","PeriodicalId":77037,"journal":{"name":"Biological structures and morphogenesis","volume":"2 1","pages":"7-11"},"PeriodicalIF":0.0,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13883281","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
Vitamin A induced bilateral asymmetries in triturus forelimb regenerates. 维生素A诱导三头猴前肢再生的双侧不对称。
Biological structures and morphogenesis Pub Date : 1988-01-01
S Koussoulakos, K K Sharma, H J Anton
{"title":"Vitamin A induced bilateral asymmetries in triturus forelimb regenerates.","authors":"S Koussoulakos,&nbsp;K K Sharma,&nbsp;H J Anton","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>After amputation of both forelimb of young, postmetamorphic Triturus alpestris through the middle of the zeugopod, the left and right regenerates grew asynchronously. As a result of oral administration of vitamin A palmitate (250 IU/gbw/day), from the 4th to the 13th dpa, the growth rate of the right regenerates was relatively higher than that of the left ones. Moreover, the percentage of skeletal abnormalities as well as proximodistal duplications (proximalizations), induced by vitamin A, was nearly twice as high in the right regenerates as compared to their left counterparts.</p>","PeriodicalId":77037,"journal":{"name":"Biological structures and morphogenesis","volume":"1 1","pages":"43-8"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14526318","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
Mammalian calcitonin cells: retrospect and prospect. 哺乳动物降钙素细胞:回顾与展望。
Biological structures and morphogenesis Pub Date : 1988-01-01
A K Srivastav, L Rani
{"title":"Mammalian calcitonin cells: retrospect and prospect.","authors":"A K Srivastav,&nbsp;L Rani","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In this review we aim to provide an overview of the published reports on the morphology, position, population, distribution and origin of calcitonin cells. Also, we have included a brief historical note and the experimental studies which demonstrate the effects on calcitonin cell function.</p>","PeriodicalId":77037,"journal":{"name":"Biological structures and morphogenesis","volume":"1 3","pages":"117-23"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14190706","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
Muscular dysgenesis in fowl: ultrastructural study of skeletal muscles in the crooked neck dwarf (cn/cn) mutant. 家禽肌肉发育不良:弯曲颈侏儒突变体骨骼肌的超微结构研究。
Biological structures and morphogenesis Pub Date : 1988-01-01
M Kieny, A M Boutineau, M P Pautou, P F Goetinck
{"title":"Muscular dysgenesis in fowl: ultrastructural study of skeletal muscles in the crooked neck dwarf (cn/cn) mutant.","authors":"M Kieny,&nbsp;A M Boutineau,&nbsp;M P Pautou,&nbsp;P F Goetinck","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In vivo evolutive aspects of muscular dysgenesis were studied in normal and crooked neck dwarf (cn/cn) 7.5- to 20-day chick embryos. Wing, leg and breast muscles were processed for electron microscopy. It appears that the effects of the gene cn are expressed in the multinucleated cells as fine structural aberrations. Dilatation of the sarcotubular system, partial loss of the contractile elements and malorganization of the myofibrils are the major anomalies observed from day 7.5 to 18 of incubation. These changes do not constitute an abrupt phenomenon. Normal and diseased multinucleated cells always coexist in the same muscle specimen; however the frequency of the pathological cells augments with time. At the end of the incubation period, the poorly organized muscle tissue contains only morbid muscle cells. Phagocytosis or autolysis are absent.</p>","PeriodicalId":77037,"journal":{"name":"Biological structures and morphogenesis","volume":"1 1","pages":"15-27"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14527251","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
Ultrastructure of mouse ectoplacental cone cells. 小鼠胎盘外锥体细胞的超微结构。
Biological structures and morphogenesis Pub Date : 1988-01-01
P K Mehrotra
{"title":"Ultrastructure of mouse ectoplacental cone cells.","authors":"P K Mehrotra","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Ectoplacental cone of the Muridae is an excrescence formed by proliferation of the polar trophectoderm of the bastocyst. Four types of trophoblast cells are seen in mouse ectoplacental cone on day 8 of the pregnancy: (1) trophoblast-1 at the base of the cone are polyhedral, compactly arranged and contain large nucleoli, (2) trophoblast-2 in the middle of the cone enclose several heterolysosomes, erythro-and leucophagosomes, (3) trophoblast-3, also in the middle, have several membrane-bound osmiophilic granules, (4) trophoblast-4 at the periphery of the cone are oblong and enclose many pleomorphic bodies. These morphological differences appear to be correlated with functional adaptation.</p>","PeriodicalId":77037,"journal":{"name":"Biological structures and morphogenesis","volume":"1 2","pages":"63-8"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14534001","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
Statistical analysis of the size of heart mitochondria in rats fed sunflower oil, primor oil or rapeseed oil. 葵花籽油、原油和菜籽油对大鼠心脏线粒体大小的统计分析。
Biological structures and morphogenesis Pub Date : 1988-01-01
A Grynberg, P O Astorg, J Lherminier
{"title":"Statistical analysis of the size of heart mitochondria in rats fed sunflower oil, primor oil or rapeseed oil.","authors":"A Grynberg,&nbsp;P O Astorg,&nbsp;J Lherminier","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The size distribution of heart mitochondria was studied in Wistar rats fed for 24 weeks a diet containing sunflower oil, primor oil or rapessed oil. The animals fed rapeseed oil showed larger heart mitochondria than the two other groups. This result could be attributed both to the presence of giant mitochondria and to an increase in size of the whole mitochondrial population. No difference was observed between the sunflower oil group and the primor oil group.</p>","PeriodicalId":77037,"journal":{"name":"Biological structures and morphogenesis","volume":"1 2","pages":"77-9"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14534003","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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