全文获取类型
收费全文 | 5444篇 |
免费 | 383篇 |
国内免费 | 63篇 |
专业分类
耳鼻咽喉 | 24篇 |
儿科学 | 241篇 |
妇产科学 | 53篇 |
基础医学 | 590篇 |
口腔科学 | 97篇 |
临床医学 | 725篇 |
内科学 | 1099篇 |
皮肤病学 | 39篇 |
神经病学 | 614篇 |
特种医学 | 487篇 |
外科学 | 531篇 |
综合类 | 85篇 |
一般理论 | 3篇 |
预防医学 | 535篇 |
眼科学 | 253篇 |
药学 | 312篇 |
中国医学 | 2篇 |
肿瘤学 | 200篇 |
出版年
2021年 | 64篇 |
2019年 | 61篇 |
2018年 | 83篇 |
2017年 | 50篇 |
2016年 | 82篇 |
2015年 | 58篇 |
2014年 | 96篇 |
2013年 | 137篇 |
2012年 | 178篇 |
2011年 | 194篇 |
2010年 | 151篇 |
2009年 | 123篇 |
2008年 | 217篇 |
2007年 | 235篇 |
2006年 | 202篇 |
2005年 | 187篇 |
2004年 | 205篇 |
2003年 | 172篇 |
2002年 | 176篇 |
2001年 | 168篇 |
2000年 | 160篇 |
1999年 | 139篇 |
1998年 | 81篇 |
1997年 | 70篇 |
1996年 | 71篇 |
1995年 | 58篇 |
1994年 | 65篇 |
1993年 | 50篇 |
1992年 | 116篇 |
1991年 | 123篇 |
1990年 | 127篇 |
1989年 | 144篇 |
1988年 | 138篇 |
1987年 | 142篇 |
1986年 | 155篇 |
1985年 | 137篇 |
1984年 | 90篇 |
1983年 | 94篇 |
1982年 | 71篇 |
1981年 | 64篇 |
1980年 | 60篇 |
1979年 | 96篇 |
1978年 | 83篇 |
1977年 | 68篇 |
1976年 | 59篇 |
1975年 | 50篇 |
1974年 | 55篇 |
1973年 | 52篇 |
1970年 | 44篇 |
1968年 | 42篇 |
排序方式: 共有5890条查询结果,搜索用时 15 毫秒
61.
P. H. Wooley J. D. Whalen J. L. Zimmerman T. M. Champion 《Inflammation research》1987,21(3-4):244-246
Type II collagen-induced arthritis (CIA) and mice was used as a model to evaluate the effect of etodolac on the arthritic and immunological parameters of the experimental disease. In a preventative protocol, a significant reduction was observed in the number of joints progressing to ankylosis. At high doses (16 mg/kg/day) a significant delay in the onset of arthritis was also observed. No significant effect was seen on the progression of the disease when etodolac was administered in established CIA. No consistent variations were observed in the anti-type II collagen response or other immunological parameters of the experimental arthritis. 相似文献
62.
A prospective trial of colchicine for primary biliary cirrhosis 总被引:10,自引:0,他引:10
M M Kaplan D W Alling H J Zimmerman H J Wolfe R A Sepersky G S Hirsch G H Elta K A Glick K A Eagen 《The New England journal of medicine》1986,315(23):1448-1454
We entered 60 patients with primary biliary cirrhosis in a double-blind randomized controlled trial to determine whether colchicine is therapeutically effective. Thirty patients had early disease (Stages 1 and 2), and 30 had advanced disease (Stages 3 and 4). Fifteen patients with early disease and 15 with advanced disease received colchicine (0.6 mg twice daily), and the remainder received placebo. Patients were studied about every two months; those remaining in the blind phase at two years underwent repeat liver biopsy and were then placed on open-label colchicine (0.6 mg twice daily). With a few exceptions, the results in patients with early disease were similar to those in patients with advanced disease; hence, data on patients in all stages were combined in the main analysis. During the two-year study period the colchicine-treated patients, as compared with the placebo-treated patients, had improvement in levels of serum albumin, serum bilirubin, alkaline phosphatase, cholesterol, and aminotransferases. However, there was no such improvement in the severity of symptoms or physical findings; moreover, there was no significant difference in the histologic changes noted at liver biopsy in the two treatment groups. At four years after entry, the cumulative mortality from liver disease was 21 percent in patients given colchicine and 47 percent in those given placebo (P = 0.05). The only side effect of colchicine was diarrhea, noted in three patients. The consistent and significant improvement in a number of markers of liver disease and the apparent decreased mortality from liver disease suggest that colchicine may provide some long-term clinical benefit in patients with primary biliary cirrhosis. However, the failure of colchicine to reduce hepatic inflammation and fibrosis leaves uncertain the effect of the drug on the longterm outcome of this disease. 相似文献
63.
The effect of celecoxib, a cyclooxygenase-2 inhibitor, in familial adenomatous polyposis 总被引:105,自引:0,他引:105
Steinbach G Lynch PM Phillips RK Wallace MH Hawk E Gordon GB Wakabayashi N Saunders B Shen Y Fujimura T Su LK Levin B Godio L Patterson S Rodriguez-Bigas MA Jester SL King KL Schumacher M Abbruzzese J DuBois RN Hittelman WN Zimmerman S Sherman JW Kelloff G 《The New England journal of medicine》2000,342(26):1946-1952
BACKGROUND: Patients with familial adenomatous polyposis have a nearly 100 percent risk of colorectal cancer. In this disease, the chemopreventive effects of nonsteroidal antiinflammatory drugs may be related to their inhibition of cyclooxygenase-2. METHODS: We studied the effect of celecoxib, a selective cyclooxygenase-2 inhibitor, on colorectal polyps in patients with familial adenomatous polyposis. In a double-blind, placebo-controlled study, we randomly assigned 77 patients to treatment with celecoxib (100 or 400 mg twice daily) or placebo for six months. Patients underwent endoscopy at the beginning and end of the study. We determined the number and size of polyps from photographs and videotapes; the response to treatment was expressed as the mean percent change from base line. RESULTS: At base line, the mean (+/-SD) number of polyps in focal areas where polyps were counted was 15.5+/-13.4 in the 15 patients assigned to placebo, 11.5+/-8.5 in the 32 patients assigned to 100 mg of celecoxib twice a day, and 12.3+/-8.2 in the 30 patients assigned to 400 mg of celecoxib twice a day (P=0.66 for the comparison among groups). After six months, the patients receiving 400 mg of celecoxib twice a day had a 28.0 percent reduction in the mean number of colorectal polyps (P=0.003 for the comparison with placebo) and a 30.7 percent reduction in the polyp burden (the sum of polyp diameters) (P=0.001), as compared with reductions of 4.5 and 4.9 percent, respectively, in the placebo group. The improvement in the extent of colorectal polyposis in the group receiving 400 mg twice a day was confirmed by a panel of endoscopists who reviewed the videotapes. The reductions in the group receiving 100 mg of celecoxib twice a day were 11.9 percent (P=0.33 for the comparison with placebo) and 14.6 percent (P=0.09), respectively. The incidence of adverse events was similar among the groups. CONCLUSIONS: In patients with familial adenomatous polyposis, six months of twice-daily treatment with 400 mg of celecoxib, a cyclooxygenase-2 inhibitor, leads to a significant reduction in the number of colorectal polyps. 相似文献
64.
Andrew S Artz Daniel A Pollyea Masha Kocherginsky Wendy Stock Elizabeth Rich Olatoyosi Odenike Todd Zimmerman Sonali Smith Lucy Godley Michael Thirman Christopher Daugherty Martine Extermann Richard Larson Koen van Besien 《Biology of blood and marrow transplantation》2006,12(9):954-964
Comorbidity measurements have recently been used to improve estimation of tolerance to allogeneic hematopoietic cell transplantation (HCT). We sought to determine the independent effect of comorbidity and performance status on HCT outcome and to devise a simple risk classification system for transplant-related mortality. We analyzed 105 consecutively enrolled patients who underwent HCT and received reduced intensity conditioning with fludarabine, melphalan, and alemtuzumab. Comorbid conditions were tabulated using 2 scales, the Charlson Comorbidity Index (CCI) and the Kaplan-Feinstein Scale (KFS). Comorbid conditions were found in 47% of patients by the KFS and in 27% by the CCI (P < .001). Using the Eastern Cooperative Oncology Group Performance Status (PS) scale, 34% had a PS score >0 (range, 0-2). A simple scale combining the KFS and PS enabled separation of high- from low-risk patients, with 6-month cumulative incidences 50% and 15%, respectively for transplant-related mortality (P = .001) and enhanced prognostic power over the CCI alone (P = .018). Prospective studies evaluating more comprehensive functional and comorbidity measurements are warranted. 相似文献
65.
Psammomatoid (juvenile) ossifying fibroma of the orbit 总被引:2,自引:0,他引:2
66.
In a consecutive series of 117 depressed patients referred for electroconvulsive therapy, the 10 with secondary depression had significantly poorer outcomes according to three independently assessed measures-Hamilton rating scale score at discharge, global rating at discharge, and mean depressive symptom score during a 6-month follow-up. 相似文献
67.
The master indenture enables members of multiinstitutional health care systems to finance capital programs and expansions by borrowing on the basis of systemwide revenues and assets. Participation in a master indenture financing may be structured in two ways. In a restricted group, only the parent organization issues notes, and only the parent is directly liable for the debt. To ensure that each member's revenues flow to the parent, the latter must have sole member status and be permitted to approve subsidiaries' debts, budgets, amendments to articles and bylaws of incorporation, and selection of trustees. Each entity's articles and bylaws must permit it to support the system members' common charitable purpose. In contrast, members of an obligated group have direct joint and several liability for master indenture notes. If one subsidiary misses a payment, the parent can call for payment from other obligated group members. Limitations on a member's obligation to support system debt in case of insolvency or bankruptcy may be included in the master indenture provisions. Whichever structure is selected, the amount of debt that can be incurred is based on the institutions' combined financial statements. The master indenture thus allows financially weak institutions to benefit from the credit strengths of stranger system members and permits the parent organization to control members' access to capital markets. 相似文献
68.
69.
70.
Anna Song Beeber Christine E. Kistler Sheryl Zimmerman Cassandra Dictus Kimberly Ward Claire Farel Keith Chrzan Christopher J. Wretman Marcella Boyton-Hansen Michael Pignone Philip D. Sloane 《Journal of the American Medical Directors Association》2021,22(1):156-163
ObjectivesTo determine what information is most important to registered nurses' (RNs) decisions to call clinicians about suspected urinary tract infections (UTIs) in nursing home residents.DesignWeb-based discrete choice experiment with 19 clinical scenarios.Setting and ParticipantsOnline survey with a convenience sample of RNs (N = 881) recruited from a health care research panel.MethodsClinical scenarios used information from 10 categories of resident characteristics: UTI risk, resident type, functional status, mental status, lower urinary tract status, body temperature, physical examination, urinalysis, antibiotic request, and goals of care. Participants were randomized into 2 deliberation conditions (self-paced, n = 437 and forced deliberation, n = 444). The degree to which evidence- and non–evidence-based information was important to decision-making was estimated using unconditional multinomial logistic regression.ResultsFor all nurses (22.8%) and the self-paced group (24.1%), lower urinary tract status had the highest importance scores for the decision to call a clinician about a suspected UTI. For the forced-deliberation group, body temperature was most important (23.7%), and lower urinary tract status was less important (21%, P = .001). The information associated with the highest odds of an RN calling about a suspected UTI was painful or difficult urination [odds ratio (OR) 4.85, 95% confidence interval (CI) 4.16–5.65], obvious blood in urine (OR 4.66, 95% CI 3.99–5.44), and temperature at 101.5° (OR 3.80, 95% CI 3.28–4.42). For the self-paced group, painful or difficult urination (OR 5.65, 95% CI 4.53–7.04) had the highest odds, whereas obvious blood in urine (OR 4.39, 95% CI 3.53–5.47) had highest odds for the forced-deliberation group.Conclusions and ImplicationsThis study highlighted the importance of specific resident characteristics in nurse decision-making about suspected UTIs. Future antimicrobial stewardship efforts should aim to not only improve the previously studied overprescribing practices of clinicians, but to improve nurses' assessment of signs and symptoms of potential infections and how they weigh resident information. 相似文献