全文获取类型
收费全文 | 849篇 |
免费 | 47篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 88篇 |
儿科学 | 28篇 |
妇产科学 | 14篇 |
基础医学 | 92篇 |
口腔科学 | 15篇 |
临床医学 | 81篇 |
内科学 | 120篇 |
皮肤病学 | 3篇 |
神经病学 | 16篇 |
特种医学 | 185篇 |
外科学 | 114篇 |
综合类 | 9篇 |
预防医学 | 33篇 |
眼科学 | 12篇 |
药学 | 70篇 |
肿瘤学 | 38篇 |
出版年
2023年 | 3篇 |
2021年 | 6篇 |
2019年 | 5篇 |
2018年 | 10篇 |
2017年 | 4篇 |
2015年 | 4篇 |
2014年 | 12篇 |
2013年 | 16篇 |
2012年 | 18篇 |
2011年 | 30篇 |
2010年 | 20篇 |
2009年 | 19篇 |
2008年 | 23篇 |
2007年 | 49篇 |
2006年 | 26篇 |
2005年 | 33篇 |
2004年 | 21篇 |
2003年 | 21篇 |
2002年 | 19篇 |
2001年 | 26篇 |
2000年 | 23篇 |
1999年 | 18篇 |
1998年 | 37篇 |
1997年 | 46篇 |
1996年 | 28篇 |
1995年 | 28篇 |
1994年 | 24篇 |
1993年 | 13篇 |
1992年 | 24篇 |
1991年 | 19篇 |
1990年 | 23篇 |
1989年 | 28篇 |
1988年 | 35篇 |
1987年 | 23篇 |
1986年 | 21篇 |
1985年 | 28篇 |
1984年 | 13篇 |
1983年 | 9篇 |
1982年 | 17篇 |
1981年 | 8篇 |
1980年 | 15篇 |
1979年 | 7篇 |
1978年 | 9篇 |
1977年 | 10篇 |
1976年 | 16篇 |
1975年 | 5篇 |
1974年 | 4篇 |
1972年 | 4篇 |
1970年 | 5篇 |
1968年 | 3篇 |
排序方式: 共有918条查询结果,搜索用时 31 毫秒
1.
2.
Golli M; Van Nhieu JT; Mathieu D; Zafrani ES; Cherqui D; Dhumeaux D; Vasile N; Rahmouni A 《Radiology》1994,190(3):741
3.
4.
J T Christmas J S Knisely K S Dawson M J Dinsmoor S E Weber S H Schnoll 《Obstetrics and gynecology》1992,80(5):750-754
OBJECTIVES: To compare the efficacy of structured questionnaire screening and prenatal urine toxicology for the detection of substance use by pregnant women, and to describe substance use patterns in a group of women presenting to a university-based obstetric clinic. METHODS: All patients presenting to our obstetric clinic for their first prenatal visit were evaluated for evidence of current use of alcohol or any illicit substances. Nursing personnel administered an extensive questionnaire, which included detailed questions about past and current substance use patterns. Urine samples were examined by a commercial laboratory for alcohol and a number of illicit substances. Current users were defined as those who admitted use within the past 30 days or who had positive urine toxicology. RESULTS: Fifty-eight of 302 patients (19.2%) were identified as current users of alcohol or illicit substances. Only 17 of 41 women (41.5%) with toxicologic evidence of recent use admitted to current use. Only 17 of 34 (50.0%) admitting to current use had toxicology positive for any substance. Patients with a history of multiple past substance use were significantly more likely to have positive urine toxicology than those without such a history (26.1 versus 7.4%; P < .005). Among current users, multiple substance use (34.5%) and cigarette smoking (52%) were common. CONCLUSION: A screening combination of structured questionnaire and universal urine toxicology identifies more current users than either technique alone, and neither is clearly superior to the other. A history of multiple substance use may be an important indicator of current use. 相似文献
5.
6.
MGC Hendriks P Dogterom JT Ebels B Oosterhuis LR Geertsema T Hulot G Bianchetti and JHG Jonkman 《Fundamental & clinical pharmacology》1998,12(5):559-565
Summary— In the present study we have compared the steady state biopharmaceutic characteristics of four diltiazem once daily controlled release capsules: Mono-Tildiem LP 300® (300 mg), Adizem® XL (300 mg)1, Cardizem® (300 mg) and Dilacor® (240 mg). Sixteen healthy male volunteers (aged 22.9 ± 3.3 years, range 19–31 years) completed an open label, multiple oral dose, randomized, four-period crossover study without a washout period in between. The volunteers received each diltiazem formulation once daily for four days. Trough diltiazem and metabolites plasma concentrations were determined on days 3 and 4. The 24-h plasma concentration-time profiles were assessed after the dose on day 4 of each period. The following steady state pharmacokinetic parameters for diltiazem were calculated: the minimum plasma concentration (cmin), the maximum plasma concentration (cmax), the time to reach that concentration (tmax), the time interval during which the plasma concentration exceeds 50% of cmax (t50), the area under the plasma concentration-time curve (AUC72–96) and the peak-to-trough fluctuation (PTF). For the metabolites of diltiazem, N-mono-desmethyl-diltiazem (NDM) and desacetyldiltiazem (DAD), AUC72–96 (AUCNDM and AUCDAD) and the ratio metabolite/parent compound were calculated. Steady state was achieved on day 3. Except one, all controlled release formulations have satisfactory controlled release properties allowing once daily administration. However, significant (P < 0.05) differences were found between the pharmacokinetic characteristics which do not allow exchange of the various formulations. Concentrations well below 50 ng·mL-1 in the morning hours were observed for Dilacor® (240 mg) and Adizem® XL (300 mg), which could be a disadvantage of these formulations as it is well-known that ischaemic events occur at a higher rate during that part of the day. The plasma concentration profiles of NDM and DAD, the major circulating metabolites, parallel the plasma concentration profiles for the parent compound. From a clinical point of view, all treatments were well tolerated. 相似文献
7.
Intestinal obstruction proximal to a transition zone without an interposed physical barrier usually indicates Hirschsprung disease. The authors report one case of focal small bowel muscular thinning just distal to a transition zone that produced clinical and radiographic findings that simulated long-segment Hirschsprung disease in a 2-day-old infant. 相似文献
8.
Peritoneal fluid concentrations of interleukin-8 in women with endometriosis: relationship to stage of disease 总被引:7,自引:10,他引:7
Gazvani MR; Christmas S; Quenby S; Kirwan J; Johnson PM; Kingsland CR 《Human reproduction (Oxford, England)》1998,13(7):1957-1961
There is increasing evidence that immunological mechanisms play a role in
the pathogenesis and pathophysiology of endometriosis. It was therefore of
interest to study interleukin-8 (IL-8), a chemokine, in the peritoneal
fluid and peripheral blood of women undergoing laparoscopic procedures. The
presence and concentrations of IL-8 in relation to endometriosis,
infertility and abdominal pain were evaluated. Samples of peritoneal fluid
(n = 49) and peripheral blood (n = 50) were obtained from 50 consecutive
patients undergoing laparoscopic surgery for various gynaecological
indications (abdominal pain, infertility, sterilization). IL-8 was present
in the peritoneal fluid of most women (87%). The concentration of IL-8 in
the peritoneal fluid was higher in women with endometriosis compared to
women without (P = 0.02). This difference was more pronounced in early
(stage 1) endometriosis (P = 0.001). IL-8 concentrations in the peritoneal
fluid were also higher in women with early endometriosis compared to women
with later stages of the disease (P = 0.003). Peripheral blood
concentrations did not correlate with peritoneal fluid concentrations of
IL-8 and/or the presence of endometriosis. We conclude that IL-8 is an
important factor that may contribute to the pathogenesis of endometriosis
possibly by promoting neovascularization. This information can be a guide
in the development of new therapeutic approaches for the treatment of
endometriosis.
相似文献
9.
Development of hatching blastocysts from immature human oocytes following in-vitro maturation and fertilization using a co-culture system 总被引:8,自引:0,他引:8
Hwu YM; Lee RK; Chen CP; Su JT; Chen YW; Lin SP 《Human reproduction (Oxford, England)》1998,13(7):1916-1921
Recently, in-vitro maturation (IVM) of immature human oocytes recovered
from non-stimulated follicles has been applied in the treatment of
infertility. However, in previous reports, very few embryos cultured in
conventional medium have reached the expanded blastocyst stage following
in-vitro maturation and fertilization (IVM/IVF). The objective of this
study was to investigate whether the developmental competence of human
embryos following IVM/IVF could be enhanced by the use of a human ampullary
cell co-culture system. Immature human oocytes were aspirated from small
follicles at Caesarean section and then cultured in medium containing human
menopausal gonadotrophin for 36 to 48 h, followed by insemination. Zygotes
were randomly cultured either in conventional culture medium alone or in
the co-culture system. Of 48 embryos cultured in conventional medium alone,
all arrested at the 2-16- cell stage on day 3 after insemination. Of 46
embryos cultured in the co-culture system, 26 embryos (56.5%) arrested at
the 2-16-cell stage. Six embryos (13%) developed to the morula stage.
Fourteen embryos (30.4%) developed to expanded blastocysts and two
blastocysts were hatching on day 7 after insemination. We conclude that
co-culture significantly enhances the development of blastocysts in embryos
resulting from IVM/IVF.
相似文献
10.