全文获取类型
收费全文 | 15084篇 |
免费 | 1196篇 |
国内免费 | 284篇 |
专业分类
耳鼻咽喉 | 163篇 |
儿科学 | 416篇 |
妇产科学 | 156篇 |
基础医学 | 767篇 |
口腔科学 | 230篇 |
临床医学 | 878篇 |
内科学 | 3326篇 |
皮肤病学 | 303篇 |
神经病学 | 1084篇 |
特种医学 | 245篇 |
外科学 | 1408篇 |
综合类 | 1335篇 |
预防医学 | 4558篇 |
眼科学 | 226篇 |
药学 | 531篇 |
2篇 | |
中国医学 | 52篇 |
肿瘤学 | 884篇 |
出版年
2024年 | 17篇 |
2023年 | 232篇 |
2022年 | 484篇 |
2021年 | 610篇 |
2020年 | 573篇 |
2019年 | 668篇 |
2018年 | 719篇 |
2017年 | 528篇 |
2016年 | 504篇 |
2015年 | 540篇 |
2014年 | 1177篇 |
2013年 | 1111篇 |
2012年 | 865篇 |
2011年 | 981篇 |
2010年 | 815篇 |
2009年 | 839篇 |
2008年 | 791篇 |
2007年 | 761篇 |
2006年 | 626篇 |
2005年 | 531篇 |
2004年 | 363篇 |
2003年 | 316篇 |
2002年 | 265篇 |
2001年 | 253篇 |
2000年 | 216篇 |
1999年 | 193篇 |
1998年 | 162篇 |
1997年 | 145篇 |
1996年 | 112篇 |
1995年 | 103篇 |
1994年 | 90篇 |
1993年 | 85篇 |
1992年 | 102篇 |
1991年 | 85篇 |
1990年 | 84篇 |
1989年 | 51篇 |
1988年 | 59篇 |
1987年 | 53篇 |
1986年 | 39篇 |
1985年 | 77篇 |
1984年 | 49篇 |
1983年 | 40篇 |
1982年 | 35篇 |
1981年 | 46篇 |
1980年 | 27篇 |
1979年 | 32篇 |
1978年 | 20篇 |
1977年 | 19篇 |
1976年 | 25篇 |
1975年 | 21篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
M. P. Muller S. E. Richardson A. McGeer L. Dresser J. Raboud T. Mazzulli M. Loeb M. Louie 《European journal of clinical microbiology & infectious diseases》2006,25(4):230-237
The clinical presentation of SARS is nonspecific and diagnostic tests do not provide accurate results early in the disease course. Initial diagnosis remains reliant on clinical assessment. To identify features of the clinical assessment that are useful in SARS diagnosis, the exposure status and the prevalence and timing of symptoms, signs, laboratory and radiographic findings were determined for all adult patients admitted with suspected SARS during the Toronto SARS outbreak. Findings were compared between patients with laboratory-confirmed SARS and those in whom SARS was excluded by laboratory or public health investigation. Of 364 cases, 273 (75%) had confirmed SARS, 30 (8%) were excluded, and 61 (17%) remained indeterminate. Among confirmed cases, exposure occurred in the healthcare environment (80%) or in the households of affected patients (17%); community or travel-related cases were rare (<3%). Fever occurred in 97% of patients by the time of admission. Respiratory findings including cough, dyspnea and pulmonary infiltrates evolved later and were present in only 59, 37 and 68% of patients, respectively, at admission. Direct exposure, fever on the first day of illness, and elevated temperature, pulmonary infiltrates, lymphopenia and thrombocytopenia at admission were associated with confirmed cases. Rhinorrhea, sore throat, and an elevated neutrophil count at admission were associated with excluded cases. In the absence of fever or significant exposure, SARS is unlikely. Other clinical, laboratory and radiographic findings further raise or lower the likelihood of SARS and provide a rational basis for estimating the likelihood of SARS and directing initial management. 相似文献
72.
目的 了解四川省大骨节病病情现状.方法 对20个大骨节病病区县进行儿童右手X线检查、成人大骨节病病情调查,采集儿童发样及当地主食粮样进行含硒量检测.结果 儿童临床检出率平均为1.02%;X线检出率平均为2.12%(0~13.16%),其中10.00%及以上的病区村有13个.成人临床检出率平均为27.02%(3.34%~53.08%),其中Ⅰ度16.73%、Ⅱ度7.79%、Ⅲ度2.49%.儿童发硒水平平均为(0.289±0.079)mg/kg,粮食硒水平平均为(0.023±0.021)mg/kg.结论 四川省大部分地区儿童大骨节病病情处于控制或基本控制范围,但局部地区尚处于较高新发病水平,成人大骨节病病情较为严重. 相似文献
73.
某部队急性腹泻病监测报告 Ⅰ.流行病学部分 总被引:1,自引:0,他引:1
1991年6月~1992年5月在驻粤某部队进行了急性腹泻病的主动监测。年发病率为0.64~1.0次/人/年。发病率与相对湿度(X2)、气温(X3),特别是雨量(X1)的关系经多元回归分析表明呈正相关。y=1.98+0.02x1+0.02x2+0.07x3,r=0.8727,P<0.01。病例-对照研究结果提示,饭前、便后不洗手等生活习惯用腹泻发病有密切关系。26.3%的患者有淋雨、腹部受凉或感冒等 相似文献
74.
Hepatitis B and Delta virus infection among heterosexuals,homosexuals and bisexual men 总被引:5,自引:0,他引:5
A. Mele E. Franco F. Caprilli G. Gentili M. A. Stazi L. Zaratti B. Capitanio E. Crescimbeni R. Corona A. Panà P. Pasquini 《European journal of epidemiology》1988,4(4):488-491
The hepatitis B virus (HBV) and hepatitis Delta virus (HDV) infection rates were estimated in patients attending a venereal disease outpatient clinic: 759 heterosexuals and 154 homosexual-bisexual men. The anti-HBC prevalence was higher in homo-bisexual men (68.8 per 100) than in heterosexuals (41.8 per 100), whereas HBsAg was roughly the same in the two groups (about 6 per 100). The anti-HBc prevalence rate among heterosexuals was higher than that estimated in hospital personnel from the same geographical area. A positive association between anti-HBc prevalence and present or past sexually transmitted diseases (STD) was found among homo-bisexual men. Anti-HBc was also positively associated with herpes simplex type 2 antibodies in both heterosexuals and homo-bisexual men. These data are consistent with the hypothesis that sexual behavior also plays a role in the spread of infection among heterosexuals. Ten of the 46 HBsAg-positive subjects were anti-HDV positive: 6 of the 36 heterosexuals and 4 of the 10 homosexuals. All HDV-positive subjects had present or past STDs. These findings suggest sexual transmission of HDV infection. 相似文献
75.
W. Allen Hauser 《Epilepsia》1992,33(Z4):6-14
Summary: Age has a profound influence on our approach to the convulsive disorders. Age is a variable which is an important determinant for risk factors for epilepsy. Age, as a surrogate of brain maturation, is a determinant of the specific characteristics of the seizure disorder in those with epilepsy, and age-related changes in these manifestations can be identified. Age is a determinant for the occurrence of acute symptomatic seizures in several types of metabolic or central nervous system insults. Age is a determinant for prognosis, whether one considers remission, medication withdrawal in those entering remission, relapse following prolonged remission, or mortality. Last, age per se seems to be a risk factor for epilepsy independent of other factors. This seems particularly true for partial seizures. 相似文献
76.
不同人群生殖道解脲支原体感染症流行病学研究 总被引:1,自引:0,他引:1
本文报告了对281名女性性乱者和300名正常对照妇女生殖道解脲支原体(Uu)感染状况的流行病学研究。性乱妇女生殖道Uu感染率为54.45%,其他性病患病率为24.56%,而正常对照妇女分别为28.67%和0.67%,差异有极显著性意义(P〈0.01)。分析结果表明:生殖道Uu感染的主要流行因素为性生活混乱、性伴数多、性活动初始年龄较小、社会经济地位低、文化程度差等;性接触是主要传播途径;选用避孕套 相似文献
77.
Coxiella burnetii, the etiological agent of Q-fever has recently been isolated from sheep in southern Sweden. In this region 24–30% of sheep farmers have been exposed to the organism as shown by serological measurements. In veterinarians, another group with high risk of exposure to C. burnetii, about 12% have antibodies to the bacteria. The seropositive veterinarians are scattered all over the country. In two non-risk groups, draftees and hospital employees, 5–7% were found to be positive. This survey showed that Q-fever is a domestic disease which is spread throughout Sweden. 相似文献
78.
H. Gharbi-Khelifi K. Sdiri V. Ferre R. Harrath M. Berthome S. Billaudel M. Aouni 《Clinical microbiology and infection》2007,13(1):25-32
This 1-year (September 2000 to August 2001) prospective study investigated the presence of hepatitis A virus (HAV) in the population of Monastir, Tunisia (86 serum samples), in the influents and effluents of two wastewater treatment plants, and in shellfish harvested in the coastal areas of Monastir, Bizerte and Sfax (January 2001 to May 2001). The virus was detected by RT-PCR using primers targeted at the VP3-VP1 region. An epidemic of HAV infection was observed during the winter months, with a peak in January. The presence of the virus was relatively constant in the influents and effluents of the wastewater treatment plants, and the virus was found in shellfish from the Monastir area during the months of January and February. The genotype IA strain was recovered most frequently from human serum and wastewater samples. The observation that the peak of the epidemic was during the winter months suggests that transmission of HAV is related to climatic factors and, presumably, to shellfish consumption. 相似文献
79.
80.
哈尔滨市动力区7—10岁儿童多动症流行病学调查 总被引:7,自引:0,他引:7
目的了解市动力区7~10岁儿童多动症的发病情况及其有关因素。方法采用分层整群抽样法对1377名儿童进行多动症的流行病学调查,主要以DSM—Ⅲ中的ADD诊断标准为参考综合诊断病例。结果多动症检出率为6.89%(95例/1377);父母为工人、父文化为小学或文盲的,检出率最高,分别为7.34%、7.72%及8.77%;父母大学文化的检出率最低(5.16%和2.83%);母孕期经受负性生活事件及家庭环境不良是多动症发病的危险因素。结论哈市动力区7~10岁多动症检出率较高;与发病有关的因素复杂多样。 相似文献