全文获取类型
收费全文 | 16318篇 |
免费 | 911篇 |
国内免费 | 61篇 |
专业分类
耳鼻咽喉 | 304篇 |
儿科学 | 1036篇 |
妇产科学 | 554篇 |
基础医学 | 1611篇 |
口腔科学 | 594篇 |
临床医学 | 1487篇 |
内科学 | 3137篇 |
皮肤病学 | 474篇 |
神经病学 | 1066篇 |
特种医学 | 480篇 |
外国民族医学 | 1篇 |
外科学 | 2354篇 |
综合类 | 485篇 |
一般理论 | 11篇 |
预防医学 | 1559篇 |
眼科学 | 434篇 |
药学 | 988篇 |
1篇 | |
中国医学 | 34篇 |
肿瘤学 | 680篇 |
出版年
2019年 | 99篇 |
2018年 | 113篇 |
2017年 | 136篇 |
2016年 | 126篇 |
2015年 | 168篇 |
2014年 | 189篇 |
2013年 | 313篇 |
2012年 | 400篇 |
2011年 | 486篇 |
2010年 | 322篇 |
2009年 | 342篇 |
2008年 | 424篇 |
2007年 | 500篇 |
2006年 | 500篇 |
2005年 | 443篇 |
2004年 | 396篇 |
2003年 | 347篇 |
2002年 | 358篇 |
2001年 | 350篇 |
2000年 | 332篇 |
1999年 | 317篇 |
1998年 | 239篇 |
1997年 | 270篇 |
1996年 | 280篇 |
1995年 | 232篇 |
1994年 | 243篇 |
1993年 | 239篇 |
1992年 | 343篇 |
1991年 | 337篇 |
1990年 | 307篇 |
1989年 | 288篇 |
1988年 | 273篇 |
1987年 | 265篇 |
1986年 | 244篇 |
1985年 | 208篇 |
1984年 | 175篇 |
1983年 | 169篇 |
1982年 | 125篇 |
1981年 | 113篇 |
1979年 | 114篇 |
1978年 | 101篇 |
1976年 | 92篇 |
1959年 | 344篇 |
1958年 | 760篇 |
1957年 | 868篇 |
1956年 | 771篇 |
1955年 | 803篇 |
1954年 | 781篇 |
1949年 | 184篇 |
1948年 | 127篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Stephen Kellett Nigel Beail David W. Newman Pat Frankish 《Journal of Applied Research in Intellectual Disabilities》2003,16(2):127-134
Introduction People with intellectual disabilities are now acknowledged to be susceptible to the full range of mental health disorders. This acknowledgement has resulted in the need to develop and evaluate instruments for the assessment and detection of mental health problems. This research evaluates the use of the Brief Symptom Inventory (BSI) with 200 people with mild intellectual disabilities representing community, clinical and forensic populations. Results and conclusions Results illustrate the reliability of the BSI for each of the groups and demonstrates how the Positive Symptom Total (PST) index effectively discriminates between study groups. Case rates for each group are provided. The study illustrates that the BSI could be employed as a brief multitrait assessment instrument and as a treatment outcome measure with people with an intellectual disability. 相似文献
6.
7.
In 1985 an outbreak of ornithosis affected 13 of 80 (16%) workers in a duck-processing plant. New employees were three times more likely to become cases than established employees. The highest attack rate was in those on the production line. Following the outbreak, an occupational health scheme was set up to monitor the health of new recruits to the company. Serological evidence of recent infection was demonstrated in 18 of 37 (49%) new employees tested in the first 3 months of employment. Five (14%) also had clinical evidence of ornithosis. Veterinary investigation of the ducks demonstrated a high proportion with asymptomatic chlamydial infection. It is suggested that ornithosis may be more common in duck processors than is currently supposed. Strategies to reduce occupational risks are discussed. 相似文献
8.
Restriction fragment length polymorphism of human mitochondrial DNA in a sample population from Apulia (Southern Italy) 总被引:8,自引:1,他引:7
Restriction fragment length polymorphism (RFLP) of human mitochondrial DNA was analysed in a sample of 87 subjects from Apulia (South Italy) by the restriction enzymes Hpa I, Bam HI, Hae II, Msp I, Ava II, and Hinc II using total blood cell DNA probed by human mtDNA from placenta. Five BamHI morphs were observed, two of which are new ( Bam HI-4 and -5), as well as one new Ava II morph ( Ava II-28). The association Bam HI-4/ Ava II-28 enables us to demonstrate for the first time two polymorphic Bam HI sites present together in the same mtDNA molecule. In agreement with historical data the Apulian sample has been shown to be the most heterogeneous Italian population so far tested. 相似文献
9.
GIUSEPPE PERSEO MAURO GIGLI ROBERTO DE CASTIGLIONE 《Chemical biology & drug design》1987,29(4):478-485
The synthesis of TPH-13 (Glp-Glu-Lys-Pro-Tyr-Trp-Pro-Pro-Pro-Ile-Tyr-Pro-Met-OH), a tridecapeptide isolated from the skin of the South American frog Phyllomedusa rohdei, is described and alternative approaches are discussed. 相似文献
10.
Intratemporal vascular tumors: detection with CT and MR imaging 总被引:1,自引:0,他引:1
Lo WW; Shelton C; Waluch V; Solti-Bohman LG; Carberry JN; Brackmann DE; Wade CT 《Radiology》1989,171(2):445-448
The diagnostic contributions of computed tomography (CT) and magnetic resonance (MR) imaging were compared in 12 patients with benign intratemporal vascular tumors (hemangioma or vascular malformation). The tumors included six in the internal acoustic canal and six in the geniculate ganglion region. Clinical and histologic correlations were made. Two of the six patients with tumors in the internal acoustic canal underwent CT, and both required gas cisternography to show the tumor. Five patients in that group underwent MR imaging, and all five studies showed the tumor. All six patients with geniculate ganglion tumors underwent CT. Results in one study were questionable, and five showed the tumor. Five patients in this group underwent MR imaging, but the MR findings were positive in only two cases. MR imaging should therefore be performed before CT in the evaluation of facial nerve dysfunction, as it demonstrated all tumors in the internal acoustic canal and some in the geniculate ganglion region. If MR findings are negative, CT should then be performed to rule out a possible geniculate ganglion lesion. 相似文献