全文获取类型
收费全文 | 9916篇 |
免费 | 654篇 |
国内免费 | 27篇 |
专业分类
耳鼻咽喉 | 130篇 |
儿科学 | 231篇 |
妇产科学 | 205篇 |
基础医学 | 1209篇 |
口腔科学 | 268篇 |
临床医学 | 1194篇 |
内科学 | 1718篇 |
皮肤病学 | 72篇 |
神经病学 | 1031篇 |
特种医学 | 361篇 |
外科学 | 1776篇 |
综合类 | 86篇 |
一般理论 | 11篇 |
预防医学 | 1007篇 |
眼科学 | 148篇 |
药学 | 566篇 |
中国医学 | 7篇 |
肿瘤学 | 577篇 |
出版年
2023年 | 39篇 |
2022年 | 69篇 |
2021年 | 160篇 |
2020年 | 108篇 |
2019年 | 167篇 |
2018年 | 173篇 |
2017年 | 185篇 |
2016年 | 170篇 |
2015年 | 214篇 |
2014年 | 289篇 |
2013年 | 441篇 |
2012年 | 615篇 |
2011年 | 645篇 |
2010年 | 347篇 |
2009年 | 317篇 |
2008年 | 588篇 |
2007年 | 671篇 |
2006年 | 694篇 |
2005年 | 690篇 |
2004年 | 661篇 |
2003年 | 627篇 |
2002年 | 575篇 |
2001年 | 97篇 |
2000年 | 87篇 |
1999年 | 99篇 |
1998年 | 132篇 |
1997年 | 117篇 |
1996年 | 81篇 |
1995年 | 91篇 |
1994年 | 85篇 |
1993年 | 74篇 |
1992年 | 65篇 |
1991年 | 52篇 |
1990年 | 51篇 |
1989年 | 46篇 |
1988年 | 46篇 |
1987年 | 44篇 |
1986年 | 38篇 |
1985年 | 57篇 |
1984年 | 51篇 |
1983年 | 60篇 |
1982年 | 64篇 |
1981年 | 62篇 |
1980年 | 60篇 |
1979年 | 43篇 |
1978年 | 51篇 |
1977年 | 39篇 |
1976年 | 40篇 |
1973年 | 38篇 |
1971年 | 39篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
A primary intrascrotal mass clinically mimicking a testicular tumor was found to be a desmoid tumor originating from the spermatic cord. To our knowledge, this is the first reported case of a paratesticular desmoid tumor. 相似文献
2.
The therapeutic implications of intratumoral regulatory T cells. 总被引:1,自引:0,他引:1
Glenn Dranoff 《Clinical cancer research》2005,11(23):8226-8229
3.
As the proportion of racial, ethnic, and cultural minorities in the United States continues to expand, pediatric emergency medicine providers are increasingly likely to encounter cultural and language barriers in practice. This paper reviews a conceptual framework encompassing the decision to seek emergency care, the process of providing such care, and the adherence to treatment plans and follow-up. The ways in which cultural and language barriers can negatively impact each element of this model are discussed in detail. Specific examples include provider ignorance of dangerous folk beliefs, communication barriers secondary to inappropriate interpreter use, and discriminatory assumptions regarding child abuse, pain management, and sexual activity. The practitioner is then provided with concrete recommendations to reduce these negative effects. 相似文献
4.
5.
Alex Westerband Joseph L. Mills Scott S. Berman Glenn C. Hunter 《Annals of vascular surgery》1997,11(1):14-19
n = 69) normal; Group B (n= 29), abnormal, severe defects; Group C (n= 56), abnormal, mild–moderate defect. RCA detected 32 defects in Group B: 10 internal carotid (ICA), seven endpoint flaps,
two kinks, one dissection; 16 external carotid (ECA), 10 severe endpoint defects and six total occlusion; six common carotid
(CCA), five irregular proximal shelfs, one web. Thirty of 32 defects were successfully repaired as confirmed by normal repeat
RCA studies; one ECA defect was not repaired and the ICA dissection was irreparable. In Group C, 67 mild–moderate defects
were identified, but not corrected. These included <30% stenosis in the ICA (12), ECA (18), CCA (24), and vein patch corrugation
or irregularity (13). For the entire series the postoperative ICA occlusion rate was 2% (3/154), stroke rate 2.6% (4/154),
and a subsequent >50% restenosis rate of 7% (11/154). The yield from routine carotid completion arteriograms was significant,
with 19% of studies identifying a severe defect that required repair. Although the difference in stroke rates and restenosis
between the different groups did not reach statistical significance, patients with normal intraoperative arteriograms initially
or after correction of a significant RCA defect had no early carotid occlusion (p= 0.05, Fisher's exact test) compared to patients with residual RCA defects. All early carotid occlusions occurred in patients
with unrepaired defects. We conclude that RCA is an important method of quality control after CEA and exerts a subtle, but
real, reduction in postoperative complications. 相似文献
6.
Noah A Goldman Ellen B Katz Alan S Glenn Richard H Weldon Joan G Jones Uticia Lynch Melissa J Fezzari Carolyn D Runowicz Gary L Goldberg Maureen J Charron 《Modern pathology》2006,19(11):1429-1436
Glucose is provided to cells by a family of glucose transport facilitators known as GLUTs. These transporters are expressed in a tissue specific manner and are overexpressed in many primary tumors of these tissues. Regulation of glucose transport facilitator expression has been demonstrated in endometrial tissue and endometrial adenocarcinoma. The following experiments were conducted to quantify and localize the expression of GLUT1 and GLUT8 in benign endometrium and compare this expression to endometrial cancer. Endometrial tissue samples were obtained from random hysterectomy specimens of patients with benign indications for surgery and endometrial cancer. Immunoblot and immunolocatization studies were performed using GLUT1 and GLUT8 specific antisera. Endometrial samples from 65 women who had undergone hysterectomy were examined (n=38 benign, n=27 malignant). A 44 and a 35.4 kDa immunoreacive species was demonstrated in endometrium and endometrial cancer for GLUT1 and GLUT8, respectively. Upregulation of GLUT1 expression was demonstrated with increasing grade of tumors (P<0.002). GLUT8 expression was increased in all tumor subtypes compared to atrophic endometrium (P<0.001). Apical localization by GLUT1 and GLUT8 was demonstrated in endometrial glands. GLUT1 and GLUT8 demonstrated diffuse intracellular localization in the cancer subtypes. GLUT1 and GLUT8 are expressed in both human endometrium and endometrial cancer. There appears to be a step-wise progression in GLUT1 and GLUT8 expression as tumor histopathology worsens. GLUT1 and GLUT8 may be important markers in tumor differentiation, as well as providing energy to rapidly dividing tumor cells. 相似文献
7.
The product of ORF O located within the domain of herpes simplex virus 1 genome transcribed during latent infection binds to and inhibits in vitro binding of infected cell protein 4 to its cognate DNA site 下载免费PDF全文
8.
9.
Glenn A Pacio Paul Visintainer George Maguire Gary P Wormser John Raffalli Marisa A Montecalvo 《Infection control and hospital epidemiology》2003,24(4):246-250
OBJECTIVE: To determine the natural history of colonization with vancomycin-resistant enterococci (VRE), methicillin-resistant Staphylococcus aureus (MRSA), and resistant gram-negative bacilli among long-term-care facility (LTCF) residents. DESIGN: Observational cohort study. SETTING: A 355-bed LTCF with a ventilator unit and a subacute unit. PARTICIPANTS: Residents with colonization or infection with VRE, MRSA, or resistant gram-negative bacilli housed at the LTCF between December 1, 1999, and February 29, 2000. METHODS: Cultures of clinical and surveillance sites were performed at regular intervals. Charts were reviewed for clinical characteristics associated with clearance of colonization. Kaplan-Meier curves were constructed to analyze the number of days to clearance of colonization. RESULTS: Forty-nine residents had 65 episodes of colonization (27 VRE, 30 MRSA, and 8 resistant gram-negative bacilli). Eighteen (28%) of the episodes cleared. The clearance rate was 2.7 episodes per 1,000 person-days. Clearance occurred significantly more often with resistant gram-negative bacilli colonization compared with VRE or MRSA colonization (6 [75%] vs 12 [21%]; P = .007; relative risk, 4.17; 95% confidence interval, 1.26 to 11.8). There was a trend toward longer use of antimicrobial agents among residents with persistent colonization. Infections occurred most frequently with MRSA. The urinary tract was the most common site of infection. CONCLUSION: Among LTCF residents, colonization with resistant gram-negative bacilli is four times more likely to clear than colonization with VRE or MRSA. Performance of surveillance cultures at regular intervals may reduce the need for contact precautions for LTCF residents with resistant gram-negative bacilli colonization. 相似文献