共查询到20条相似文献,搜索用时 31 毫秒
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Kozlova EK Fomina UA Moroz VV Bogushevich MS Chernysh AM 《Patologicheskaia fiziologiia i èksperimental'naia terapiia》2004,(1):20-22
The role of synergism in diffusion of oxygen from erythrocyte into interstitial liquid and water filtration through the capillary wall was studied on the model using the following parameters: hydrostatic pressure on arterial and venous ends of the capillary (Pa and Pb), oncotic blood and tissue pressure (Pob and Pot), pore radius in the capillary (r), the number of pores in the capillary (n) per m2, amount of the liquid released from the capillary (q(x)), gas diffusion coefficient (D), time of erythrocyte movement in the capillary (T), speed of oxygen consumption (V), maximal distance with adequate V (Xmax), characteristic time of diffusion (Topt). It is shown that diffuse and convective components of the metabolic process have their own contribution and in changed conditions they redistribute. In increased number and diameter of hydravlic pores the greatest role in tissue saturation with oxygen belongs to convective metabolism, but in this situation tissues contain areas lacking oxygen. 相似文献
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Merrot O Vacher C Merrot S Godlewski G Frigard B Goudot P 《Surgical and radiologic anatomy : SRA》2005,27(4):265-270
Resorption of alveolar bone is the best recognized feature of mandibular aging in the edentate subject. The other consequences
of the loss of teeth in the elderly are less well known. An anthropometric study of the mandible by antero-posterior and lateral
radiographs of subjects older than 70 years both dentate and edentate but without any maxillo-mandibular dysmorphosis has
been done to demonstrate the differences, which exist between the dentate and edentate mandible. The edentate mandibles showed
a diminution in the height of the symphysis and increase in the height of the mandibular incisure. A diminution in the height
of the body and an increase in the gonial angle in the significant manner. No significant difference was seen for the height
of the ramus and the length of the mandible, the minimum width of the ramus and the bigonial width. The diminution in the
height of the mandibular symphysis and of the body is explained by the resorption of the alveoli part of the mandible. The
increase in the mandibular angle and the diminution in the height of the mandibular incisure may be explained by disequilibrium
between the elevator and depressor muscles of the mandible, as a function of the elevator muscles or by the absence of the
molar buttress. 相似文献
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Elliott WJ Stemer A Toth SJ 《The New England journal of medicine》1999,341(20):1548-9; author reply 1550
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The present paper contains data on the morphological modifications present in chicks which, after treatment with testosterone lasting 10 days (from the seventh to the seventeenth days after hatching), were killed on the 30th, 35th, 40th, 50th and 70th day of life; this interval of time might theoretically have allowed a gradual re-establishment of the bursal architecture. Examination of the bursae of Fabricus of the animals treated showed greatly varying pictures. The 2 main types of behaviour were the following: the histological pattern of certain bursae had been completely restored to normal. Others did not act in the same way but wide areas of their plicae proved to be devoid of lymphoid tissue and well-formed lymphoid follicles were observed only in certain places. These 2 kinds of behaviour, and particularly what we observed in the second case, might suggest that, since the lymphoid follicle-associated epithelial cells are the last to disappear after treatment with testosterone propionate and the follicles are restored only where these cells remain, the lymphoid follicle-associated epithelial cells may be considered to be responsible for the re-establishment of the bursal follicle. 相似文献
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N Iu Medvedev 《Arkhiv patologii》1985,47(4):42-47
Adrenal glands of 52 children dying from a syndrome of sudden death (SSD) and 14 children of the same age dying from acute viral respiratory infections (AVRI) with a long terminal period were studied. The following adrenal changes typical for the SSD were observed: low weight, decrease of the size of the definitive cortex and its zones, the appearance of numerous adenomatous growths in the definitive cortex and so-called giant cells in the fetal cortex, low secretory activity. The appearance of adenomas and giant cells in the presence of organ hypoplasia is a compensatory-hyperplastic adrenal response which attests to a long glucocorticoid deficiency in the SSD. It is suggested that the deficiency of these hormones leads to the metabolic disturbances in various organs, including brain, resulting in the narrowing of the range of homeostatic host responses; this may become the cause of sudden death when the clinical and morphological manifestations of AVRI are insignificant. 相似文献
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A series of experiments evaluated whether the habituation of the startle response of the rat to tactile and auditory cues is stimulus specific. Experiment 1 showed stimulus specificity of a short-term habituation effect, whereby the startle to the second of a pair of stimuli was significantly less when the initial stimulus involved the same rather than the different modality. Experiments 2 and 3 focused on the more persistent decrement in startle that is a result of repeated stimulation, and demonstrated that such long-term habituation to the tactile and auditory stimuli contained a stimulus specific component in addition to a generalized component. The generalized habituation observed between the tactile and auditory stimuli in the three experiments may be due to an auditory accompaniment of the tactile stimulus employed. Discussion emphasized the utility of investigating habituation in a preparation with robust specificity. 相似文献
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Recent literature has emphasized the clinical and socio-epidemiological significance of asthma in the elderly. However, why the disease burden remains high in this group is unclear. Elderly subjects usually have multiple chronic illnesses, and the role played by comorbidities in the context of asthma has been underappreciated. This review aims to summarize the literature associations between comorbidities and asthma in elderly patients. In addition, we discuss patient management issues. 相似文献
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S.W. McDonald A. Lockhart D. Gormal N.K. Bennett 《Clinical anatomy (New York, N.Y.)》1996,9(5):296-301
Six months and more after unilateral vasectomy in the rat, ipsilateral (same side) and bilateral testicular atrophy are common; this paper investigates their etiology. Ipsilateral atrophy is associated with the presence of a sperm granuloma in the head of the corresponding epididymis and appears to be pressure-mediated. That sperm granulomas at the epididymal head fail to relieve intraluminal pressure in the epididymal duct of the rat was supported by a study of the effects of ligation of that region. No histological evidence was found to indicate that bilateral atrophy was the result of an immune response. A radiological study does not support the idea that compression or displacement of testicular blood vessels by sperm granulomas is responsible for bilateral atrophy. © 1996 Wiley-Liss, Inc. 相似文献
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Life in the Future Versus Life in the Present 总被引:1,自引:0,他引:1
Thomas D. Borkovec 《Clinical psychology》2002,9(1):76-80
Roemer and Orsillo have provided an integrative perspective for developing more effective therapies for generalized anxiety disorder, based on existing knowledge about the disorder, cognitive behavioral approaches to its treatment, and conceptualizations and treatment methods from the acceptance/mindfulness tradition. The present commentary expands upon the notion of the adaptive value of focused attention on present-moment experience and cognitive perspectives that can facilitate that process. 相似文献