共查询到20条相似文献,搜索用时 0 毫秒
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Ichelson DL 《California medicine》1956,85(6):413-415
The dependence of cancer of the breast and prostate gland upon sex hormones has led to an attack on this problem by way of adrenalectomy with castration or by hypophysectomy when hormone treatment has failed. The survival period of patients who have had adrenalectomy or hypophysectomy has been prolonged by use of cortisone. The risk of either operation is reasonable and maintenance of life on cortisone is simple. The results are encouraging, with a tendency in favor of hypophysectomy. It seems justifiable to advise operation at an early stage of the disease. 相似文献
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Manus M. Patten David Haig Francisco Úbeda 《Evolution; international journal of organic evolution》2010,64(12):3638-3642
Extensive fitness variation for sexually antagonistic characters has been detected in nature. However, current population genetic theory suggests that sexual antagonism is unlikely to play a major role in the maintenance of variation. We present a two‐locus model of sexual antagonism that is capable of explaining greater fitness variance at equilibrium than previous single‐locus models. The second genetic locus provides additional fitness variance in two complementary ways. First, linked loci can maintain gene variants that are lost in single‐locus models of evolution, expanding the opportunity for polymorphism. Second, linkage disequilibrium results between any two sexually antagonistic genes, producing an excess of high‐ and low‐fitness haplotypes. Our results uncover a unique contribution of conflicting selection pressures to the maintenance of variation, which simpler models that neglect genetic architecture overlook. 相似文献
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J. Lionel Stretton 《BMJ (Clinical research ed.)》1908,1(2456):190-191
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Observation of 100 patients with atopic dermatitis due to hypersensitivity to pollen over a period of 12 years emphasized certain important diagnostic and therapeutic features. The incidence was higher in females than in males and higher in middle and old age than in the earlier years.Pollen dermatitis may be the sole or major manifestation of allergy; 43 patients gave no history of other allergic symptoms. It may involve any or all areas of the body. The site or the distribution of lesions or the nature of the lesions gave no clue as to the diagnosis of pollen sensitivity.The character of the eruption varied widely from patient to patient and in given patients from week to week at times.Atopic dermatitis due to pollen sensitivity may be purely seasonal, perennial with seasonal exacerbations or perennial without seasonal variation.Reactions to skin testing with pollens suspected as allergens may be positive, equivocal or negative. In 58 patients there were positive correlative skin reactions to pollens.The diagnosis of atopic dermatitis due to pollen sensitivity, and the composition of the desensitizing antigen or antigens, must be based primarily on the clinical history and the area of residence.Most patients could tolerate only very weak dilutions at the beginning of desensitization therapy. Strong dilutions caused exacerbation of the dermatitis.Good or excellent results were obtained with perennial pollen desensitization therapy administered over long periods. In 13 patients good results took four to eight years of desensitization therapy. Fifty required less than two years. Tolerance of the patient for a given dose of antigen should determine the maximum dilution used in therapy. 相似文献