全文获取类型
收费全文 | 56832篇 |
免费 | 4583篇 |
国内免费 | 199篇 |
专业分类
耳鼻咽喉 | 513篇 |
儿科学 | 1554篇 |
妇产科学 | 1095篇 |
基础医学 | 7513篇 |
口腔科学 | 990篇 |
临床医学 | 6320篇 |
内科学 | 10933篇 |
皮肤病学 | 814篇 |
神经病学 | 4863篇 |
特种医学 | 2308篇 |
外科学 | 9397篇 |
综合类 | 792篇 |
一般理论 | 57篇 |
预防医学 | 5606篇 |
眼科学 | 1264篇 |
药学 | 4091篇 |
2篇 | |
中国医学 | 53篇 |
肿瘤学 | 3449篇 |
出版年
2023年 | 325篇 |
2022年 | 455篇 |
2021年 | 1159篇 |
2020年 | 655篇 |
2019年 | 1090篇 |
2018年 | 1315篇 |
2017年 | 960篇 |
2016年 | 1036篇 |
2015年 | 1243篇 |
2014年 | 1816篇 |
2013年 | 2516篇 |
2012年 | 3809篇 |
2011年 | 3899篇 |
2010年 | 2124篇 |
2009年 | 1888篇 |
2008年 | 3398篇 |
2007年 | 3678篇 |
2006年 | 3552篇 |
2005年 | 3445篇 |
2004年 | 3183篇 |
2003年 | 3030篇 |
2002年 | 2863篇 |
2001年 | 885篇 |
2000年 | 845篇 |
1999年 | 845篇 |
1998年 | 685篇 |
1997年 | 569篇 |
1996年 | 540篇 |
1995年 | 558篇 |
1994年 | 461篇 |
1993年 | 431篇 |
1992年 | 545篇 |
1991年 | 497篇 |
1990年 | 511篇 |
1989年 | 481篇 |
1988年 | 455篇 |
1987年 | 395篇 |
1986年 | 398篇 |
1985年 | 442篇 |
1984年 | 376篇 |
1983年 | 309篇 |
1982年 | 264篇 |
1981年 | 240篇 |
1980年 | 223篇 |
1979年 | 243篇 |
1978年 | 238篇 |
1977年 | 193篇 |
1974年 | 210篇 |
1973年 | 195篇 |
1972年 | 188篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
BACKGROUND: The reasons for mis-reporting food consumption warrant investigation. OBJECTIVE: To document intention to mis-report food consumption and its associations with psychological measures in women. DESIGN: A total of 184 female volunteers aged 18-65 years, comprising 50 seeking help in primary care to lose weight with a body mass index (BMI) >/=30 kg m(-2) (obese-clinical group) and 134 nurses (nonclinical groups) (BMI <25 kg m(-2), n = 52; BMI 25-29.9 kg m(-2), n = 45; BMI >/=30 kg m(-2), n = 37) were studied. A questionnaire was administered containing three psychological tests (self-esteem, psychological well-being and Stunkard's three-factor eating questionnaire) and new items to address food intake mis-reporting. RESULTS: Overall, 68% of participants declared an inclination to mis-report (64% nonclinical, 78% clinical). Inclination to under-report was 29, 33 and 51% in the three nonclinical groups; and 46% among the obese clinical patients. Among the same groups, inclination to over-report were 39, 29, 11 and 32%. After adjusting for social deprivation and BMI, women inclined to mis-report had higher hunger (P = 0.008) and disinhibition (P = 0.005) scores than those intending to report accurately. These variables were associated with current dieting, frequency of dieting, self-reported bingeing and dissatisfaction with body weight. CONCLUSIONS: These findings indicate that intentional under-reporting and over-reporting of food consumption are common in women of all BMI categories and are associated with eating behaviour. Current dieting, frequency of dieting in the past, self-reported bingeing and dissatisfaction with body weight seem to mediate this relationship. 相似文献
102.
103.
Scott Lozanoff Barbara A. Long David L. Singer John J. Deptuch 《Journal of clinical periodontology》1992,19(8):553-559
Deposits of dental plaque or calculus are typically quantified using planimetric techniques. However, error is introduced into a quantitative analysis of plaque deposits using these methods, since they require a significant amount of human intervention. The purpose of this study is to describe and validate a computerized imaging routine which has the potential to objectively identify material on dental roots and measure the area covered by these deposits. Dentiform teeth with simulated plaque were videorecorded. A computer routine was developed based on a flood-fill algorithm which analyzed images of the dentiform teeth and determined the amount of simulated plaque on their root surfaces. Results showed that the dentiform teeth and their simulated plaque patterns are duplicated by the imaging routine in a rapid and reliable fashion. The system shows a high degree of accuracy with an average error factor of only 0.58%. As well, the system enables precise reproducibility with an average error factor of only 0.71%. 相似文献
104.
105.
John D Scott Janet A Englund David Myerson Adam P Geballe 《Journal of clinical virology》2004,31(2):96-99
BACKGROUND: Stem cell transplant recipients are susceptible to pulmonary infections, including influenza A. Typically, isolated influenza pneumonia has a diffuse, interstitial infiltrate pattern. OBJECTIVES: To describe the unusual clinical and radiographic course of influenza A pneumonia in a stem cell transplant recipient. STUDY DESIGN: Case report in which microbiologic assays, bronchoscopic and pathologic specimens are obtained. RESULTS: We describe a patient with influenza A pneumonia 8 months following a peripheral blood stem cell transplant who presented with minimal respiratory symptoms and rapidly progressing, focal pulmonary infiltrates. The large size and appearance of the masses have not been reported before in a patient with isolated influenza. CONCLUSION: This case highlights the differences of presentation and importance of early diagnosis and treatment of immunocompromised patients infected with influenza. 相似文献
106.
Samuel B Adams Paul R Herz Debra L Stamper Mark J Roberts Stephane Bourquin Nirlep A Patel Karl Schneider Scott D Martin Sonya Shortkroff James G Fujimoto Mark E Brezinski 《Journal of orthopaedic research》2006,24(4):708-715
The objective of this study was to develop and verify a new technique for monitoring the progression of osteoarthritis (OA) by combining a rat model with the imaging modality optical coherence tomography (OCT). Time-sequential, in vivo, OCT imaging was performed on the left femoral condyles of 12 Wistar rats following sodium-iodoacetic acid-induced OA progression. The right femoral condyles (untreated) were also imaged and served as controls. Imaging was performed on days 0, 10, 20, 30, and 60 with an OCT system capable of acquiring images at four frames per second and an axial resolution of 5 microm. Progressive changes were analyzed using an OA scoring system. OCT successfully identified progressive cartilage degeneration as well as alteration of the cartilage/bone interface. Significant changes to both of these structures were observed in the sodium-iodoacetic acid-injected condyles. Structural changes detected with OCT were confirmed histologically. OCT in combination with a well-known model used in arthritis research represents a powerful tool for following degenerative joint disease progression in a given animal by detecting changes to the cartilage/bone interface and articular cartilage. 相似文献
107.
Scott W. Powers Kelly C. Byars Monica J. Mitchell Susana R. Patton Teresa Schindler Margaret H. Zeller 《Children's Health Care》2003,32(4):297-311
This pilot study examined a behavioral treatment to increase calorie intake in toddlers with cystic fibrosis. Eight toddlers were randomly assigned to behavioral plus nutrition (BEH) or nutrition intervention (NTR) conditions. Calorie intake and weight were measured at pre- and posttreatment. The BEH group showed a trend for changes in calorie intake pre- to posttreatment (p = .07; 40% increase). Results for the BEH and NTR groups did not differ significantly. Most participants achieved weight gains consistent with normal growth. Seventy-five percent had not shown this pattern during the year prior to intervention. These results support the feasibility and potential for behavioral interventions in this age group. 相似文献
108.
109.
M.D.Bradley P. Kropp M.D.Mark D. Dabagia M.D.John W. Scott M.D.James E. Lingeman 《Urology》1994,44(6)
We present a patient with tuberous sclerosis and bilateral angiomyolipomaswith a right partial staghorn calculi in which the calculi was managed with a percutaneous nephrolithotomy. Despite the inherent risk of hemorrhage with a percutaneous approach compounded by the fact that this was done directly through a tumor, we were able to render the patient stone free with no intraoperative bleeding, complications, or the need for postoperative blood transfusion. To our knowledge, this is the first reported case of percutaneous nephrolithotomy directly through a renal angiomyolipoma. 相似文献
110.
Absence of an association between HLA-DRB1*04 and rheumatoid arthritis in newly diagnosed cases from the community. 总被引:2,自引:2,他引:0
W Thomson L Pepper A Payton D Carthy D Scott W Ollier A Silman D Symmons 《Annals of the rheumatic diseases》1993,52(7):539-541
OBJECTIVES--To determine HLA-DR4 and DR1 allele frequencies in a series of patients with newly diagnosed early inflammatory arthritis. METHODS--HLA-DR1 and DR4 frequencies were determined by oligonucleotide typing of 208 patients classified as having either rheumatoid arthritis (RA) or undifferentiated inflammatory polyarthritis. RESULTS--The frequency of occurrence of DR4 in these patients with RA did not differ significantly from that in controls in the United Kingdom (42 v 37%). HLA-DR1 was increased in the group with inflammatory polyarthritis (25 v 18%). CONCLUSIONS--The frequency of DR4 is not increased in newly diagnosed community based patients with RA. This supports the hypothesis that DR4 is less important as a marker for susceptibility to RA than it is for disease persistence or severity. 相似文献