全文获取类型
收费全文 | 15697篇 |
免费 | 1258篇 |
国内免费 | 31篇 |
专业分类
耳鼻咽喉 | 135篇 |
儿科学 | 351篇 |
妇产科学 | 263篇 |
基础医学 | 2051篇 |
口腔科学 | 460篇 |
临床医学 | 1977篇 |
内科学 | 2716篇 |
皮肤病学 | 150篇 |
神经病学 | 1654篇 |
特种医学 | 556篇 |
外科学 | 1773篇 |
综合类 | 638篇 |
一般理论 | 17篇 |
预防医学 | 1729篇 |
眼科学 | 254篇 |
药学 | 1470篇 |
中国医学 | 11篇 |
肿瘤学 | 781篇 |
出版年
2023年 | 88篇 |
2022年 | 126篇 |
2021年 | 284篇 |
2020年 | 170篇 |
2019年 | 230篇 |
2018年 | 355篇 |
2017年 | 241篇 |
2016年 | 264篇 |
2015年 | 304篇 |
2014年 | 394篇 |
2013年 | 636篇 |
2012年 | 1029篇 |
2011年 | 1129篇 |
2010年 | 605篇 |
2009年 | 529篇 |
2008年 | 916篇 |
2007年 | 1026篇 |
2006年 | 962篇 |
2005年 | 974篇 |
2004年 | 935篇 |
2003年 | 921篇 |
2002年 | 807篇 |
2001年 | 312篇 |
2000年 | 281篇 |
1999年 | 268篇 |
1998年 | 194篇 |
1997年 | 139篇 |
1996年 | 122篇 |
1995年 | 118篇 |
1994年 | 102篇 |
1993年 | 111篇 |
1992年 | 163篇 |
1991年 | 145篇 |
1990年 | 171篇 |
1989年 | 131篇 |
1988年 | 111篇 |
1987年 | 107篇 |
1986年 | 118篇 |
1985年 | 100篇 |
1984年 | 83篇 |
1983年 | 88篇 |
1982年 | 68篇 |
1981年 | 60篇 |
1980年 | 61篇 |
1979年 | 94篇 |
1978年 | 84篇 |
1977年 | 77篇 |
1975年 | 60篇 |
1974年 | 73篇 |
1971年 | 64篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
Second-generation endometrial ablation techniques provide an effective surgical treatment option for women with menorrhagia. Their ease of use might result in inappropriate surgical treatment without previous medical therapy. We sought to establish local compliance with national guidelines following the recent introduction of second generation ablation techniques into routine practice. We collected data at the time of ablation on the preceding medical management of women undergoing either microwave endometrial ablation or thermal balloon ablation. One hundred and thirty-two consecutive women underwent second-generation endometrial ablation. At least one medical treatment (range 1-5) was used before ablation in 86% of women. The majority (86%) of women undergoing a second-generation endometrial ablation technique received at least one effective medical therapy before surgical intervention, indicating a high level of compliance with published guidelines. 相似文献
52.
53.
54.
Cricopharyngeal Crohn's disease 总被引:1,自引:0,他引:1
We report a case of Crohn's disease of the cricopharyngeal oesophagus which presented with complete dysphagia and was successfully treated by balloon dilatation. We can find no previous reports of such a case. 相似文献
55.
56.
57.
The effects of intracerebral implants of steroid hormones on scent marking in the female gerbil (Meriones unguiculatus) were studied in two experiments. In Experiment 1 various steroids were implanted alone or in combination into the preoptic and anterior hypothalamic area of ovariectomized females. Unilateral implants of testosterone + estrogen, estrogen, estrogen + progesterone, testosterone and testosterone + progesterone stimulated a significant level of marking when compared to controls. Experiment 2 utilized bilateral implants of estrogen dissolved in paraffin in order to explore the distribution hormone sensitive areas in the brain which might be important in the regulation of scent marking in the female gerbil. Pellets of estrogen-paraffin were implanted stereotaxically into either the anterior hypothalamus, preoptic area, septum, hippocampus, thalamus, amygdala or anterior olfactory nucleus of ovariectomized females. Total dosage of hormone implanted was 8.2–8.4 μg. A significant level of marking resulted in animals receiving implants into the anterior hypothalamus, preoptic area and septum when compared to controls. Marking appeared at about the same rate in each of these groups; however, the level of marking attained differed. By the last trial, anterior hypothalamic implanted animals were marking significantly more often than animals in either the preoptic or septum groups. Although there was no evidence of ieakage from the brain, the data suggested that some rapid diffusion of hormone, largely restricted to the brain, was taking place or that the three areas were differentially responsive to the hormone. The data do indicate that some localization of function does exist with respect to regulation of scent marking in the female. 相似文献
58.
Pavel-Mititean LM Rowbottom CG Hector CL Partridge M Bortfeld T Schlegel W 《Physics in medicine and biology》2004,49(12):2613-2629
A geometric model is presented which allows calculation of the dosimetric consequences of rectal motion in prostate radiotherapy. Variations in the position of the rectum are measured by repeat CT scanning during the courses of treatment of five patients. Dose distributions are calculated by applying the same conformal treatment plan to each imaged fraction and rectal dose-surface histograms produced. The 2D model allows isotropic expansion and contraction in the plane of each CT slice. By summing the dose to specific volume elements tracked by the model, composite dose distributions are produced that explicitly include measured inter-fraction motion for each patient. These are then used to estimate effective dose-surface histograms (DSHs) for the entire treatment. Results are presented showing the magnitudes of the measured target and rectal motion and showing the effects of this motion on the integral dose to the rectum. The possibility of using such information to calculate normal tissue complication probabilities (NTCP) is demonstrated and discussed. 相似文献
59.
60.
Margalith M Chatlynne LG Fuchs E Owen C Lee CR Yermiyahu T Whitman JE Ablashi DV 《Journal of acquired immune deficiency syndromes (1999)》2003,34(5):500-505
OBJECTIVE: To compare the prevalence of antibodies to human herpesvirus 8 (HHV-8) or Kaposi sarcoma-associated herpesvirus among Israeli and Ethiopian subjects. METHODS: Serum samples were obtained from 98 Israeli Jewish students aged 18-30 years, 100 HIV-1-seronegative Ethiopian immigrants to Israel of the same age, and 100 HIV-1-seronegative Ethiopian children 1-12 years old upon their arrival in southern Israel. Plasma samples were obtained from 3 hospitalized patients with multicentric Castleman disease (MCD) as positive controls. All serum samples were tested for antibodies to both latent and lytic antigens. Antibodies to the lytic antigens and the latency-associated nuclear antigen (LANA) of HHV-8 were detected by enzyme linked immunosorbent assay and by immunofluorescence assay. HHV-8 DNA from serum or plasma samples was detected by polymerase chain reaction analysis. RESULTS: Antibodies to HHV-8 LANA were detected in 2.9% of the Israeli subjects aged 18-30 years and in 26% of the Ethiopian subjects from both age groups tested. Antibodies to the lytic antigens were detected in all 3 MCD patients, in 4% of the Ethiopian children, and in 2% of the 18- to 30-year-old Ethiopians. No antibodies to the lytic antigens were detected in the Israeli students. HHV-8 DNA was detected in all 3 MCD patients and in 2 of 4 of the Ethiopian children positive for the lytic antigens. CONCLUSIONS: HHV-8 is highly prevalent in Ethiopian immigrants to Israel as compared with Israeli students. Antibodies to HHV-8 in Ethiopia are acquired before puberty. The results of this study indicate the association of HHV-8 with MCD, as has been documented by many other researchers. 相似文献