全文获取类型
收费全文 | 14228篇 |
免费 | 1285篇 |
国内免费 | 31篇 |
专业分类
耳鼻咽喉 | 89篇 |
儿科学 | 517篇 |
妇产科学 | 383篇 |
基础医学 | 1882篇 |
口腔科学 | 414篇 |
临床医学 | 1639篇 |
内科学 | 2775篇 |
皮肤病学 | 152篇 |
神经病学 | 1080篇 |
特种医学 | 845篇 |
外科学 | 2037篇 |
综合类 | 421篇 |
一般理论 | 11篇 |
预防医学 | 1553篇 |
眼科学 | 145篇 |
药学 | 866篇 |
1篇 | |
中国医学 | 8篇 |
肿瘤学 | 726篇 |
出版年
2021年 | 183篇 |
2019年 | 198篇 |
2018年 | 228篇 |
2017年 | 183篇 |
2016年 | 182篇 |
2015年 | 221篇 |
2014年 | 293篇 |
2013年 | 440篇 |
2012年 | 616篇 |
2011年 | 646篇 |
2010年 | 353篇 |
2009年 | 363篇 |
2008年 | 542篇 |
2007年 | 632篇 |
2006年 | 554篇 |
2005年 | 532篇 |
2004年 | 506篇 |
2003年 | 469篇 |
2002年 | 451篇 |
2001年 | 424篇 |
2000年 | 505篇 |
1999年 | 449篇 |
1998年 | 226篇 |
1997年 | 212篇 |
1996年 | 238篇 |
1995年 | 222篇 |
1994年 | 167篇 |
1993年 | 184篇 |
1992年 | 322篇 |
1991年 | 329篇 |
1990年 | 365篇 |
1989年 | 341篇 |
1988年 | 298篇 |
1987年 | 298篇 |
1986年 | 287篇 |
1985年 | 313篇 |
1984年 | 205篇 |
1983年 | 167篇 |
1982年 | 115篇 |
1981年 | 117篇 |
1980年 | 129篇 |
1979年 | 158篇 |
1978年 | 144篇 |
1977年 | 124篇 |
1976年 | 121篇 |
1975年 | 116篇 |
1974年 | 124篇 |
1973年 | 116篇 |
1972年 | 116篇 |
1971年 | 114篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
H Bell A Bj?rneboe B Eidsvoll K R Norum N Raknerud K Try Y Thomassen C A Drevon 《Alcohol and alcoholism (Oxford, Oxfordshire)》1992,27(1):39-46
The concentration of alpha-tocopherol was measured in liver biopsy specimens obtained from 83 patients with alcoholic and non-alcoholic liver diseases. The mean hepatic vitamin E content (as alpha-tocopherol) was significantly lower in 23 patients with alcoholic cirrhosis (17.6 +/- 12.1 nmol/mg wet weight liver), compared with 12 patients with normal liver histology (39.2 +/- 29.7 nmol/mg, P less than 0.01). The mean serum concentration of alpha-tocopherol was lower in patients with alcoholic cirrhosis (13.9 +/- 7.0 mumol/l) than in individuals with alcoholic fatty liver (21.3 +/- 9.3 mumol/l, P less than 0.01) and patients with normal liver histology (23.4 +/- 11.6 mumol/l, P less than 0.01). A decreased ratio of serum alpha-tocopherol/total serum lipids was also observed in patients with alcoholic cirrhosis, compared with patients with normal liver histology (P less than 0.05). There was a significant correlation between concentrations of alpha-tocopherol in liver and serum (r = 0.43, P less than 0.001). Furthermore, serum alpha-tocopherol correlated with retinol (r = 0.53, P less than 0.001), selenium (r = 0.45, P less than 0.001), and albumin (r = 0.37, P less than 0.001) in serum. We suggest that the reduced content of hepatic alpha-tocopherol observed in some patients may play a role in ethanol-induced lipid peroxidation. 相似文献
52.
53.
Pancreatitis after parathyroidectomy 总被引:1,自引:0,他引:1
N J London D M Lloyd H Pearson J P Neoptolemos P R Bell 《The British journal of surgery》1986,73(9):766-767
54.
P M McCarthy V F Trastek D G Bell G R Buttermann J M Piehler W S Payne L H Weiland P C Pairolero 《The Annals of thoracic surgery》1988,45(2):203-205
The effectiveness of fibrin glue as a biological sealant for pulmonary air leaks was determined in 16 dogs. A standardized pleural defect was made in the left lower lobe, and the quantity of air passing through a chest tube was assessed with a Collins respirometer. For the 8 randomly assigned control animals, the air leak decreased over 90 minutes from a mean of 1.4 L/min to a mean of 1.1 L/min (mean decrease, 19.8%). In the 8 randomly assigned fibrin glue-treated animals, the air leak decreased from a mean of 2.1 L/min to a mean of 0.5 L/min (mean decrease, 80.8%) (p less than 0.0001). Postoperative evaluation of survivors disclosed no increased adhesions in the glue-treated animals and complete resorption of the glue at 3 months. We conclude that in this animal model, fibrin glue reduced the size of pulmonary air leaks in the early period after thoracotomy and did not lead to increased intrapleural adhesions. 相似文献
55.
56.
Angela
J. Dean James Bell Macdonald
J. Christie Richard
P. Mattick 《European psychiatry》2004,19(8):510-513
Research suggests that buprenorphine may possess antidepressant activity. The Beck Depression Inventory was completed at baseline and 3 months by heroin dependent subjects receiving either buprenorphine or methadone maintenance as part of a larger, pre-existing, double blind trial conducted by NDARC (Australia). Depressive symptoms improved in all subjects, with no difference between methadone and buprenorphine groups, suggesting no differential benefit on depressive symptoms for buprenorphine compared to methadone. 相似文献
57.
58.
The authors report the clinical and laboratory findings of a patient who had severe immune hemolytic anemia due to hydrochlorothiazide (HCTZ). In this case, the HCTZ antibody reacted not only with other thiazide and thiazide-like drugs, but also with a chemically unrelated diuretic, ethacrynic acid. These results indicate that HCTZ antibody activity is not restricted solely to the thiazides and imply that therapy with any of the reactive drugs would be contraindicated for this patient. The serologic screening for drug reactivity may be useful for selecting alternative therapy for patients with drug-induced immune hemolytic anemia. 相似文献
59.
60.
OBJECTIVE: We sought to determine whether the use of talc in genital hygiene increases the risk for epithelial ovarian cancer. METHODS: We interviewed 235 white women diagnosed with epithelial ovarian cancer between 1984-1987 at ten Boston metropolitan area hospitals and 239 population-based controls of similar race, age, and residence. RESULTS: Overall, 49% of cases and 39% of controls reported exposure to talc, via direct application to the perineum or to undergarments, sanitary napkins, or diaphragms, which yielded a 1.5 odds ratio (OR) for ovarian cancer (95% confidence interval [CI] 1.0-2.1). Among women with perineal exposure to talc, the risk was significantly elevated in the subgroups of women who applied it: 1) directly as a body powder (OR 1.7, 95% CI 1.1-2.7), 2) on a daily basis (OR 1.8, 95% CI 1.1-3.0), and 3) for more than 10 years (OR 1.6, 95% CI 1.0-2.7). The greatest ovarian cancer risk associated with perineal talc use was observed in the subgroup of women estimated to have made more than 10,000 applications during years when they were ovulating and had an intact genital tract (OR 2.8, 95% CI 1.4-5.4); however, this exposure was found in only 14% of the women with ovarian cancer. CONCLUSIONS: These data support the concept that a life-time pattern of perineal talc use may increase the risk for epithelial ovarian cancer but is unlikely to be the etiology for the majority of epithelial ovarian cancers. 相似文献