全文获取类型
收费全文 | 22184篇 |
免费 | 1359篇 |
国内免费 | 855篇 |
专业分类
耳鼻咽喉 | 159篇 |
儿科学 | 396篇 |
妇产科学 | 192篇 |
基础医学 | 961篇 |
口腔科学 | 342篇 |
临床医学 | 1895篇 |
内科学 | 2817篇 |
皮肤病学 | 88篇 |
神经病学 | 389篇 |
特种医学 | 398篇 |
外国民族医学 | 1篇 |
外科学 | 6786篇 |
综合类 | 2660篇 |
现状与发展 | 2篇 |
预防医学 | 1386篇 |
眼科学 | 148篇 |
药学 | 2457篇 |
24篇 | |
中国医学 | 2496篇 |
肿瘤学 | 801篇 |
出版年
2024年 | 63篇 |
2023年 | 598篇 |
2022年 | 964篇 |
2021年 | 1397篇 |
2020年 | 1245篇 |
2019年 | 1064篇 |
2018年 | 1163篇 |
2017年 | 1139篇 |
2016年 | 748篇 |
2015年 | 718篇 |
2014年 | 1649篇 |
2013年 | 1715篇 |
2012年 | 1396篇 |
2011年 | 1490篇 |
2010年 | 1060篇 |
2009年 | 920篇 |
2008年 | 951篇 |
2007年 | 945篇 |
2006年 | 739篇 |
2005年 | 635篇 |
2004年 | 475篇 |
2003年 | 419篇 |
2002年 | 365篇 |
2001年 | 281篇 |
2000年 | 244篇 |
1999年 | 278篇 |
1998年 | 200篇 |
1997年 | 174篇 |
1996年 | 159篇 |
1995年 | 170篇 |
1994年 | 119篇 |
1993年 | 99篇 |
1992年 | 88篇 |
1991年 | 78篇 |
1990年 | 66篇 |
1989年 | 59篇 |
1988年 | 57篇 |
1987年 | 51篇 |
1986年 | 35篇 |
1985年 | 51篇 |
1984年 | 49篇 |
1983年 | 42篇 |
1982年 | 47篇 |
1981年 | 39篇 |
1980年 | 29篇 |
1979年 | 20篇 |
1978年 | 24篇 |
1977年 | 21篇 |
1976年 | 20篇 |
1974年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
71.
A case is reported in which entrapped polymethylmethacrylate following traumatic dislocation of a total hip replacement prevented complete reduction. A combined arthroscopic and fluoroscopic technique was used to remove the entrapped polymethylmethacrylate. Manipulation of the total hip prosthesis was done after removal of polymethylmethacrylate to minimize mechanical abrasion. This technique allows direct visual assessment of the articulating surfaces as well as the mechanical stability of the prosthesis. The morbidity related to the procedure is minimal and a short rehabilitation period is the major advantage. 相似文献
72.
N G Forouhi D Merrick E Goyder B A Ferguson J Abbas K Lachowycz S H Wild 《Diabetic medicine》2006,23(2):189-197
AIMS: To estimate the total prevalence of diabetes mellitus (diagnosed and undiagnosed) at national, regional and local level in England to support health-care planning and delivery. METHODS: An epidemiological model was constructed by applying age-sex-ethnic-specific reference prevalence rates from epidemiological studies to resident populations (2001 census) of England at national, regional, and local authority/Primary Care Trust levels. RESULTS: Estimated prevalence of total diabetes for all persons in England was 4.41% in 2001, equating to 2 168 000 persons. Type 2 diabetes was estimated to affect 2 002 000 persons (92.3%) and Type 1 diabetes 166 000 persons (7.7%). Diabetes prevalence was estimated to be higher in women (5.17%) than men (3.61%). People from ethnic minority groups had higher crude prevalence than White Europeans (4.29, 5.69, 6.63 and 2.13% among White Europeans, Black African/Caribbeans, South Asians and 'other' groups, respectively). Prevalence increased sharply with age (0.33, 3.37 and 13.92%, respectively, in those aged 0-29, 30-59 and 60+ years). The model allows use of user-defined population denominator estimates to derive numbers and prevalence of people with diabetes for a given local population group, such as at ward or general practice level. CONCLUSIONS: Self-reported diabetes prevalence estimates from community surveys underestimate the true burden of diabetes. The model can be used to derive the expected total prevalence of diabetes in health areas that lack reliable data to facilitate the implementation of the National Service Framework for diabetes. It will also allow estimates of future diabetes prevalence to be derived, and can potentially be used for prevalence estimates in all of the UK. 相似文献
73.
Yoshinori Uji Arthur Karmen Hiroaki Okabe Keishi Hata Masakazu Miura Kazuyuki Ozaki Mitsuo Minamizaki Tetsushi Shibata Seiichi Inayama 《Journal of clinical laboratory analysis》1994,8(5):267-272
An automated measurement of total and free hydroxyproline in serum or urine is presented that uses flow injection analysis. After exclusion of nonspecific substances, hydroxyproline was oxidized by chloramine- T and L-cysteine with Ehrlich's reagent. The linearity obtained was from 3.8μmole/ L to 1.22 mmole/L with good precision (CV <3%). Comparison of the proposed method with HPLC yielded r = 0.939 as the correlation coefficient. Reference intervals of free and total hydroxyproline are 1.4–9.7 μmole/L, 3.8–27.2 μmole/L for serum, and 10.0–72.5 μmole/L, 25.2–303.6 μmole/L for urine, respectively. Serum free and total hydroxyproline levels in renal osteodystrophy patients on maintenance hemodialysis (N = 71) were significantly higher than in controls (P<0.0001). This method is superior to the use of HPLC with regard to stability of the color reaction. The measurement of serum free and total hydroxyproline is a useful marker for therapeutic observation of renal osteodystrophy patients. © 1994 Wiley-Liss, Inc. 相似文献
74.
Hanako Tsubone Tomoyuki Onishi Tetsuyuki Hayashibara Shizuo Sobue Takashi Ooshima 《Journal of oral pathology & medicine》2002,31(4):239-241
A Japanese girl was referred to Osaka University Dental Hospital for examination of a tooth-like structure that had erupted following spontaneous exfoliation of a natal tooth in the lower left primary central incisor region. The structure had erupted at 6 months of age, and radiographic and clinical examination showed composition of pulp and dentin, but no enamel. On histological examination, the majority of the dentin area had a tubular dentin-like appearance, while the outer area of the root appeared to be composed of an osteodentin-like substance. Most of the dentin was covered by cementum. These findings suggest that the structure had originated from a developing remnant of the extracted natal tooth, which must have remained in the gingival tissues. We termed this calcified structure a residual natal tooth. 相似文献
75.
76.
目的 :探讨B超在药物流产不全中的诊断价值及宫内残留胚胎物的超声图像特征。方法 :采用ALOKASSD5 0 0型超声诊断仪 ,对 94例米非司酮药流后阴道不规则出血的患者进行超声检查。结果 :胚胎残留物超声图像特征明显 ,阳性率为 77 66% ,与病理检查的符合率为 95 74%。结论 :B超检查能迅速、准确地诊断药流后宫内胚胎组织残留 ,为临床治疗提供可靠的依据。 相似文献
77.
Edward McNulty Joshua Cohen Tony Chou Kendrick Shunk 《Catheterization and cardiovascular interventions》2006,67(1):46-48
We present two patients with angulated, proximal left circumflex lesions, one a chronic total occlusion and one an acute subtotal occlusion. In both cases, use of the deflectable tip Venture Catheter (Velocimed, Minneapolis, MN) facilitated guide wire passage and successful percutaneous coronary intervention (PCI) after prior attempts at guide wire passage with standard wires were unsuccessful. 相似文献
78.
79.
Day-to-day variations in serum iron, serum iron binding capacity, serum ferritin and erythrocyte protoporphyrin were determined on 2 successive days in 48 patients with anaemia. The correlation coefficients between the paired determinations were 0.86, 0.89, 0.95 and 0.95, and the day-to-day coefficients of variation (in per cent) were 33, 11, 12 and 13 for serum iron, serum iron binding capacity, erythrocyte protoporphyrin and serum ferritin, respectively. Thus, in patients with anaemia, day-to-day variations in serum iron, serum iron binding capacity, erythrocyte protoporphyrin and serum ferritin are at least as high as in healthy controls. The results indicate important limitations in the use, particularly, of serum iron in the clinical investigation of anaemia. 相似文献
80.
按本文提出的病型分类方法对121例肝胆管结石进行术后随访,结果表明:肝内、上部、下部胆管狭窄型及胆管无狭窄型分别以肝叶切除、肝门部狭窄胆管切除或整形胆肠吻合、胆总管空肠吻合或Oddi括约肌成形、胆总管切开取石术为基本术式,术后疗效较好。多数病例术后残余结石长期存在,肝功能恢复与残余结石有直接关系。 相似文献