全文获取类型
收费全文 | 761篇 |
免费 | 96篇 |
国内免费 | 15篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 25篇 |
妇产科学 | 23篇 |
基础医学 | 127篇 |
口腔科学 | 9篇 |
临床医学 | 71篇 |
内科学 | 150篇 |
皮肤病学 | 11篇 |
神经病学 | 35篇 |
特种医学 | 143篇 |
外科学 | 76篇 |
综合类 | 51篇 |
预防医学 | 35篇 |
眼科学 | 12篇 |
药学 | 60篇 |
中国医学 | 1篇 |
肿瘤学 | 42篇 |
出版年
2021年 | 6篇 |
2018年 | 5篇 |
2017年 | 6篇 |
2016年 | 5篇 |
2015年 | 6篇 |
2014年 | 12篇 |
2013年 | 16篇 |
2011年 | 9篇 |
2010年 | 18篇 |
2009年 | 18篇 |
2008年 | 21篇 |
2007年 | 13篇 |
2006年 | 30篇 |
2005年 | 19篇 |
2004年 | 14篇 |
2003年 | 14篇 |
2002年 | 14篇 |
2001年 | 19篇 |
2000年 | 12篇 |
1999年 | 25篇 |
1998年 | 30篇 |
1997年 | 44篇 |
1996年 | 28篇 |
1995年 | 28篇 |
1994年 | 28篇 |
1993年 | 26篇 |
1992年 | 25篇 |
1991年 | 26篇 |
1990年 | 15篇 |
1989年 | 33篇 |
1988年 | 24篇 |
1987年 | 24篇 |
1986年 | 17篇 |
1985年 | 18篇 |
1984年 | 7篇 |
1983年 | 15篇 |
1982年 | 11篇 |
1981年 | 18篇 |
1980年 | 14篇 |
1979年 | 15篇 |
1978年 | 8篇 |
1977年 | 10篇 |
1976年 | 6篇 |
1973年 | 10篇 |
1972年 | 19篇 |
1971年 | 14篇 |
1970年 | 8篇 |
1969年 | 15篇 |
1967年 | 11篇 |
1966年 | 11篇 |
排序方式: 共有872条查询结果,搜索用时 15 毫秒
61.
62.
Aim: Although obesity and weight gain generally are anticipated to be caused by an imbalance between energy intake and energy expenditure, the significance of thyroid hormones (TH) remains unclear. Examination of mitochondrial function may reflect intracellular thyroid hormone effect and elucidate whether a lower metabolic rate is present. Methods: In a group of 34 obese adolescents (age <16 years and body mass index above the age‐related 95th percentile), and an age‐ and gender‐matched group of 32 lean adolescent, thyroid stimulating hormone (TSH) and basal oxygen consumption were measured and mitochondrial function in peripheral blood monocytes was determined by flow cytometry. Results: Significant increase in TSH (3.06 ± 1.56 mU/L vs. 2.33 ± 0.91 mU/L, p < 0.05) and a decrease in VO2 (129 ± 16 mL O2/m2*min vs. 146 ± 15 mL O2/m2*min, p < 0.05) were observed in obese adolescents compared with lean adolescents. Flow cytometry analysis demonstrated a lower mitochondrial mass (6385 ± 1962 a.u. vs. 7608 ± 2328 a.u., p < 0.05) and mitochondrial membrane potential (11426 ± 3861 a.u. vs. 14017 ± 5536 a.u., p < 0.05) in obese adolescents compared with lean adolescents. These results are even more pronounced in adolescents with obese mothers. Conclusion: In obese adolescents, the increased TSH and lowered VO2 propose a lowered basal metabolic rate and the impaired mitochondrial function suggests a decreased thyroid hormone stimulation of mitochondrial energy production. The maternal in‐heritage is suggestive of a basal metabolic defect or mitochondrial resistance for TH. 相似文献
63.
64.
65.
Posteroanterior (PA) and caudally angulated PA views were obtained in 20 patients undergoing routine coronary arteriography. Although the left main coronary artery (LMCA) was seen well on both views in all patients, the PA-caudal view improved depiction of the LMCA bifurcation in 15 (75%). In addition, the PA-caudal view markedly improved depiction of the circumflex artery, affording optimal depiction of this artery and its branches in 78%-89% of patients. Neither the PA nor the PA-caudal view allowed adequate depiction of the left anterior descending artery. Thus, the PA-caudal view should supplant the PA view in routine coronary arteriography. 相似文献
66.
PL.RM. Palaniappan Selvi Sabhanayakam N. Krishnakumar M. Vadivelu 《Food and chemical toxicology》2008,46(7):2440-2444
Catla catla fingerlings were reared in freshwater and exposed to 15.5 ppm concentration of lead for 60 days. The morphological changes on the gill of the C. catla fingerlings due to lead intoxication and the effect of DMSA (meso 2,3-dimercaptosuccinic acid) on the affected tissues were observed using Scanning Electron Microscope. It has been found that the lead treated gill tissues showed certain marked changes, such as cell hypertrophy, alteration in the lamellar surfaces, epithelial hyperplasia and the fusion of adjacent lamellae. The antidote DMSA treatment reduces the toxic effects and helps the recovery of gill tissue and its return to the level of the control/normal. 相似文献
67.
68.
M Perry I Drašković T van Achterberg GF Borm MIJ van Eijken PL Lucassen MJFJ Vernooij-Dassen MGM Olde Rikkert 《BMC health services research》2008,8(1):71
Background
Early diagnosis of dementia benefits both patient and caregiver. Nevertheless, dementia in primary care is currently under-diagnosed. Some educational interventions developed to improve dementia diagnosis and management were successful in increasing the number of dementia diagnoses and in changing attitudes and knowledge of health care staff. However, none of these interventions focussed on collaboration between GPs and nurses in dementia care. We developed an EASYcare-based Dementia Training Program (DTP) aimed at stimulating collaboration in dementia primary care. We expect this program to increase the number of cognitive assessments and dementia diagnoses and to improve attitudes and knowledge of GPs and nurses. 相似文献69.
When inferior vena caval obstruction complicates the Budd-Chiari syndrome, conventional portosystemic shunts are not possible. The mesoatrial shunt has been devised to enable portal and sinusoidal decompression in these patients. Findings in 12 patients with Budd-Chiari syndrome and inferior vena caval obstruction in whom a mesoatrial shunt was performed are reported. Preoperative inferior vena cavography with pressure measurements is essential to determine the appropriate shunt procedure. Postoperatively, shunt patency is assessed with superior mesenteric arterial portography. Where possible, transvenous catheterization of the shunt is performed to confirm patency and assess hemodynamic function. 相似文献
70.
Conventional computer-based medical expert systems deliver advice to physicians as written text. While such advice is useful, it has distinct limitations in a visually oriented discipline such as diagnostic radiology, in which decisions often depend on pattern recognition and appreciation of subtle morphologic features. The authors developed a prototype expert computer system, IMAGE/ICON, which displays groups of images sorted into a series of axes based on different ways in which they may be similar. They may share a common feature, group of features, causes, or clinical setting. IMAGE/ICON may display examples of morphologic variations of a dominant finding or a spectrum of abnormalities seen in an specific disease or group of diseases. The system also assembles a written analysis of key features of a case. Such a tool may be useful as a diagnostic aid or for continuing medical education. It is likely to have particular impact in the form of an intelligent radiologic workstation, as picture archiving and communication systems become available. 相似文献