全文获取类型
收费全文 | 3068篇 |
免费 | 169篇 |
国内免费 | 34篇 |
专业分类
耳鼻咽喉 | 68篇 |
儿科学 | 146篇 |
妇产科学 | 41篇 |
基础医学 | 327篇 |
口腔科学 | 87篇 |
临床医学 | 236篇 |
内科学 | 669篇 |
皮肤病学 | 56篇 |
神经病学 | 285篇 |
特种医学 | 78篇 |
外科学 | 470篇 |
综合类 | 35篇 |
一般理论 | 4篇 |
预防医学 | 145篇 |
眼科学 | 111篇 |
药学 | 236篇 |
中国医学 | 11篇 |
肿瘤学 | 266篇 |
出版年
2024年 | 1篇 |
2023年 | 27篇 |
2022年 | 75篇 |
2021年 | 148篇 |
2020年 | 81篇 |
2019年 | 98篇 |
2018年 | 141篇 |
2017年 | 102篇 |
2016年 | 133篇 |
2015年 | 112篇 |
2014年 | 164篇 |
2013年 | 178篇 |
2012年 | 302篇 |
2011年 | 268篇 |
2010年 | 157篇 |
2009年 | 148篇 |
2008年 | 204篇 |
2007年 | 213篇 |
2006年 | 160篇 |
2005年 | 123篇 |
2004年 | 127篇 |
2003年 | 96篇 |
2002年 | 92篇 |
2001年 | 9篇 |
2000年 | 3篇 |
1999年 | 12篇 |
1998年 | 13篇 |
1997年 | 11篇 |
1996年 | 11篇 |
1995年 | 7篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 7篇 |
1991年 | 6篇 |
1990年 | 6篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1985年 | 1篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1972年 | 1篇 |
排序方式: 共有3271条查询结果,搜索用时 15 毫秒
991.
992.
Approximately 20% of children with idiopathic slipped capital femoral epiphysis (SCFE) have bilateral disease. Predicting which patients will develop problems with both hips remains difficult. This is the first study to evaluate the relationship between body mass index (BMI) and unilateral and bilateral SCFEs. Height and weight measurements of patients presenting with SCFE to our institution were obtained and used to calculate the BMI. Of the 54 patients enrolled in the study, 16 ultimately had bilateral disease. The mean BMI of patients with bilateral disease was significantly greater than that of patients with unilateral disease. In addition, patients presenting with unilateral involvement who progressed to bilateral disease had a significantly greater average BMI than patients who did not progress. Elevated BMI is associated with SCFE, especially bilateral SCFE. 相似文献
993.
994.
Vikas Sinha Devang Gupta Bela prajapati Yogesh More Priyanka Khandelwal Shashank Nath Singh B. Himanshu 《Indian journal of otolaryngology and head and neck surgery》2008,60(3):207-209
Background The aim of study is to evaluate the Endoscopic dacryocystorhinostomy (DCR) with conventional instruments, its results and
advantage over external dacryocystorhinostomy (DCR).
Methods The study group comprised of 127 patients who underwent consecutive endoscopic dacryocystorhinostomy. The cases operated by
one team were included in the study to make the uniform analysis and its result. There were 48 males and 79 female in this
study and male female ratio was 1:1.6. The mean age of the patient was 37 years (range from 16 years to 58 years). There were
wide variety of cases like epiphora, lacrimal sac abscess, lacrimal sac fistula, acute dacryocystitis and road vehicular accident.
All the patients had undergone non-laser, non-powered conventional instruments surgery under local anesthesia. The lighted
probe was not used in any case for sac identification. The free flow of saline through newly created stoma during sac syringing
was considered as successful criteria. The stent was used in two cases of road vehicular accident and in remaining 125 cases
no stent was used. There were 66 cases of epiphora, 30 cases of lacrimal sac abscess, 26 cases of acute dacryocystitis, 3
cases of lacrimal fistula and 2 case of road traffic accident with multiple fractures. The average follow up period was 17
months (maximum follow up 3 years and minimum 4 months.)
Results The success rate was 96 %.
Conclusion The endoscopic DCR with conventional instruments is safe with very high success rate without any complications. It can be
done in acute cases and very much suited for lacrimal sac abscess and lacrimal sac fistula. 相似文献
995.
996.
Ajay Duseja Ashim Das Reena Das R K Dhiman Yogesh Chawla A Bhansali 《Tropical gastroenterology》2005,26(3):123-125
BACKGROUND: Patients with nonalcoholic steatohepatitis (NASH) have normal liver function tests except for raised transaminases until they have progressed to cirrhosis of liver. The objective of this study was to evaluate patients of NASH for the presence of hyperbilirubinemia at presentation. METHOD: Sixty-seven patients of NASH were studied for the presence of hyperbilirubinemia at presentation. All patients were worked up for the presence of cirrhosis and hemolytic work up and fasting test were done in those found with unconjugated hyperbilirubinemia. RESULTS: Five out of 67 patients (7.5%) of NASH were found to have unconjugated hyperbilirubinemia. Though the fasting test was not positive, they all had a negative hemolytic workup and none of them had underlying cirrhosis. Clinical characteristics of patients with unconjugated hyperbilirubinemia were similar to those with normal serum bilirubin levels. CONCLUSION: Unconjugated hyperbilirubinemia in patients with NASH may suggest an associated Gilbert's syndrome. 相似文献
997.
Measurement, Characterization, and Source of Somatostatin-like Immunoreactivity in Human Amniotic Fluid 下载免费PDF全文
Somatostatin-like immunoreactivity (SLI) is widely distributed in tissues and biological fluids. To determine whether SLI is also present in amniotic fluid, samples obtained by amniocentesis from 30 normal and 27 abnormal pregnancies were studied by radioimmunoassay. Direct incubation of [(125)I-Tyr(1)]tetradecapeptide somatostatin (SRIF) with amniotic fluid resulted in 89% tracer degradation. Damage was reduced to <5% when samples were acidified and boiled before the assay. With this technique, SLI was detectable in all normal amniotic fluid samples; the mean level at 15-20 wk of gestation (320+/-55 pg/ml, n = 15) being 4.5 times higher than the mean at 32-43 wk (70+/-12 pg/ml, n = 15) (P < 0.001). In cases of preeclampsia (n = 6), gestational diabetes (n = 5), anencephaly (n = 1), and meningomyelocele (n = 1), SLI values were in the normal range, but in one juvenile diabetic and one patient with chronic renal failure, SLI was undetectable (<10 pg/ml). In a pair of monochorionic diamniotic twins, SLI levels were very different (33 and 197 pg/ml), which suggests that fetal factors are more important than materno-placental ones in determining amniotic fluid SLI. Serial dilutions of amniotic fluid showed parallelism with standard SRIF. When concentrates of pooled amniotic fluid were chromatographed on Sephadex G-25 columns, all SLI eluted in the void volume ahead of SRIF even after treatment with 8 M urea and dithiothreitol. This "big" SLI incubated in amniotic fluid showed 100% stability over 24 h at 37 degrees C, whereas SRIF was rapidly inactivated (t((1/2)) congruent with 7 min). Extracts of placenta and fetal membranes contained no SLI, but small amounts (6-20% of total amniotic fluid SLI) were found in cells from fresh fluid. Radioimmunoassay of SLI in extracts of seven paired cord arterial and venous plasma samples showed no arteriovenous gradient consistent with fetal origin of cord blood SLI. It is concluded that (a) amniotic fluid contains SLI which is of fetal origin and (b) normal levels vary with gestational age. The SLI has a higher molecular weight (>/=5,000) and is more stable in amniotic fluid than SRIF. 相似文献
998.
999.
1000.
Wolfgang Marx Nicola Veronese Jaimon T Kelly Lee Smith Meghan Hockey Sam Collins Gina L Trakman Erin Hoare Scott B Teasdale Alexandra Wade Melissa Lane Hajara Aslam Jessica A Davis Adrienne O'Neil Nitin Shivappa James R Hebert Lauren C Blekkenhorst Michael Berk Toby Segasby Felice Jacka 《Advances in nutrition (Bethesda, Md.)》2021,12(5):1681
Numerous observational studies have investigated the role of the Dietary Inflammatory Index (DII®) in chronic disease risk. The aims of this umbrella review and integrated meta-analyses were to systematically synthesize the observational evidence reporting on the associations between the DII and health outcomes based on meta-analyses, and to assess the quality and strength of the evidence for each associated outcome. This umbrella review with integrated meta-analyses investigated the association between the DII and a range of health outcomes based on meta-analyses of observational data. A credibility assessment was conducted for each outcome using the following criteria: statistical heterogeneity, 95% prediction intervals, evidence for small-study effect and/or excess significance bias, as well as effect sizes and P values using calculated random effects meta-analyses. In total, 15 meta-analyses reporting on 38 chronic disease-related outcomes were included, incorporating a total population of 4,360,111 subjects. Outcomes (n = 38) were examined through various study designs including case-control (n = 8), cross-sectional (n = 5), prospective (n = 5), and combination (n = 20) study designs. Adherence to a pro-inflammatory dietary pattern had a significant positive association with 27 (71%) of the included health outcomes (P value < 0.05). Using the credibility assessment, Class I (Convincing) evidence was identified for myocardial infarction only, Class II (Highly suggestive) evidence was identified for increased risk of all-cause mortality, overall risk of incident cancer, and risk of incident site-specific cancers (colorectal, pancreatic, respiratory, and oral cancers) with increasing (more pro-inflammatory) DII score. Most outcomes (n = 31) presented Class III (Suggestive) or lower evidence (Weak or No association). Pro-inflammatory dietary patterns were nominally associated with an increased risk of many chronic disease outcomes. However, the strength of evidence for most outcomes was limited. Further prospective studies are required to improve the precision of the effect size. 相似文献