全文获取类型
收费全文 | 8362篇 |
免费 | 580篇 |
国内免费 | 77篇 |
专业分类
耳鼻咽喉 | 125篇 |
儿科学 | 255篇 |
妇产科学 | 212篇 |
基础医学 | 948篇 |
口腔科学 | 786篇 |
临床医学 | 609篇 |
内科学 | 1659篇 |
皮肤病学 | 179篇 |
神经病学 | 528篇 |
特种医学 | 412篇 |
外科学 | 1136篇 |
综合类 | 204篇 |
一般理论 | 2篇 |
预防医学 | 787篇 |
眼科学 | 203篇 |
药学 | 543篇 |
1篇 | |
中国医学 | 125篇 |
肿瘤学 | 305篇 |
出版年
2023年 | 41篇 |
2022年 | 123篇 |
2021年 | 195篇 |
2020年 | 131篇 |
2019年 | 202篇 |
2018年 | 256篇 |
2017年 | 223篇 |
2016年 | 234篇 |
2015年 | 242篇 |
2014年 | 341篇 |
2013年 | 391篇 |
2012年 | 504篇 |
2011年 | 579篇 |
2010年 | 324篇 |
2009年 | 292篇 |
2008年 | 436篇 |
2007年 | 504篇 |
2006年 | 485篇 |
2005年 | 456篇 |
2004年 | 353篇 |
2003年 | 286篇 |
2002年 | 272篇 |
2001年 | 211篇 |
2000年 | 192篇 |
1999年 | 133篇 |
1998年 | 112篇 |
1997年 | 116篇 |
1996年 | 119篇 |
1995年 | 76篇 |
1994年 | 62篇 |
1993年 | 69篇 |
1992年 | 60篇 |
1991年 | 77篇 |
1990年 | 65篇 |
1989年 | 83篇 |
1988年 | 81篇 |
1987年 | 59篇 |
1986年 | 72篇 |
1985年 | 79篇 |
1984年 | 37篇 |
1983年 | 29篇 |
1980年 | 29篇 |
1979年 | 30篇 |
1977年 | 30篇 |
1976年 | 24篇 |
1975年 | 24篇 |
1970年 | 27篇 |
1969年 | 40篇 |
1967年 | 27篇 |
1966年 | 21篇 |
排序方式: 共有9019条查询结果,搜索用时 31 毫秒
31.
Paulo Gustavo Sampaio Lacativa Laura Maria Carvalho de Mendon?a Pedro José de Mattos Patrício Filho José Raimundo Pimentel Manoel Domingos da Cruz Gon?alves Maria Lucia Fleiuss de Farias 《Journal of clinical densitometry》2005,8(3):352-361
Hyperparathyroidism contributes significantly to decreased bone mineral density (BMD) in end-stage renal disease patients, but this negative influence is not homogeneous throughout the skeleton. We studied the BMD by dual-energy X-ray absorptiometry on total body and on different regions of the skeleton in 42 patients with severe hyperparathyroidism on hemodialysis. We also evaluated the relationship between different risk factors and BMD found on the regions examined in these patients. The legs and other sites where cortical bone predominate were mostly affected, whereas trabecular bone was relatively preserved. This is probably the result of the different effects of hyperparathyroidism on cortical and trabecular bone, but we cannot rule out the interference of ectopic calcifications and sclerotic lesions of vertebral end-plates falsely increasing lumbar spine BMD. The main determinants of low total-body BMD were, in order of importance, immobility, high intact parathyroid hormone levels, low body mass index, and low albumin. Eleven patients presented with pathologic fractures, mainly in the legs, and BMD was lower in this group than in patients without fractures. In conclusion, our study makes clear that hyperparathyroidism is a great threat to bone density in hemodialysis patients, mainly in the legs, the site mostly affected by fragility fractures in our patients. Physicians must worry not only with high parathyroid hormone levels, but also with the nutritional state of these patients. 相似文献
32.
33.
Sa A Wang Aliyah Rahemtullah William C Faquin Janet Roepke Nancy Lee Harris Robert P Hasserjian 《Modern pathology》2005,18(12):1577-1584
Hodgkin's lymphoma rarely involves the thyroid gland. We report the clinical and pathologic features of five cases of Hodgkin's lymphoma that presented as thyroid lesions. All five patients were females, aged 29-59 years. Three patients had a history of chronic thyroiditis and hypothyroidism and two were euthyroid. One patient had a remote history of Hodgkin's lymphoma. Imaging studies showed a 'cold' nodule (three cases) or a diffusely enlarged thyroid gland, resembling goiter or fibrosclerosing thyroiditis (two cases). Thyroid fine-needle aspiration was performed before thyroidectomy in all cases; three of these cases contained some atypical cells, raising the possibility of Hodgkin's lymphoma. Histologically, all cases were classical Hodgkin's lymphoma, nodular sclerosis subtype. The four patients with primary thyroid lymphoma had Stage IIE disease. All patients were treated with surgical excision and chemotherapy, with or without radiation therapy, and were alive after 2 months to 7 years of follow-up. A review of the English literature between 1962 and 2005 revealed 16 cases of thyroid Hodgkin's lymphoma, with a female preponderance and generally favorable outcome similar to the cases in our series. Hodgkin's lymphoma of the thyroid is rare and can mimic a primary thyroid epithelial tumor or thyroiditis clinically. Histologic diagnosis may be difficult due to marked fibrosis. Hodgkin's lymphoma should be considered in the differential diagnosis of thyroid neoplasms. 相似文献
34.
目的根据"以病人为中心、以家庭为单位、以社区为范围"的全科理念对高血压病患者进行群体干预,以达到更为理想的治疗效果。方法将社区中303名高血压病患者作为一个群体统一管理。结果群体干预效果明显优于针对某一患者治疗的专科模式,有显著性差异(P0.01)。结论高血压病患者群体干预效果显著,在慢性病管理中,全科模式有明显优越性,值得提倡。 相似文献
35.
36.
Oscillatory motion of the normal cervical spinal cord 总被引:2,自引:0,他引:2
37.
Georges Dellatolas Lucia Willadino Braga Ligia do Nascimento Souza Gilberto Nunes Filho Elizabeth Queiroz Gerard Deloche 《Journal of the International Neuropsychological Society》2003,9(5):771-782
The effect of the degree of illiteracy (complete or incomplete) on phonological skills, verbal and visual memory and visuospatial skills is examined in 97 normal Brazilian adults who considered themselves illiterate, and 41 Brazilian school children aged 7 to 8 years, either nonreaders or beginning readers. Similar literacy effects were observed in children and in adults. Tasks involving phonological awareness and visual recognition memory of nonsense figures distinguish the best nonreaders and beginning readers. Children performed better than adults at oral repetition of short items and figure recall, and adults better than children at semantic verbal fluency, digit span, and word list recall. A principal component analysis of the correlations between tasks showed that phonological awareness/reading, phonological memory/oral repetition, and semantic verbal memory/fluency tasks, generated different components. The respective role of culturally based preschool activities and literacy on the cognitive functions that are explored in this study is discussed. 相似文献
38.
Periosteal Ewing sarcoma 总被引:3,自引:0,他引:3
39.