全文获取类型
收费全文 | 1480篇 |
免费 | 118篇 |
国内免费 | 36篇 |
专业分类
耳鼻咽喉 | 83篇 |
儿科学 | 62篇 |
妇产科学 | 24篇 |
基础医学 | 130篇 |
口腔科学 | 26篇 |
临床医学 | 191篇 |
内科学 | 331篇 |
皮肤病学 | 12篇 |
神经病学 | 65篇 |
特种医学 | 189篇 |
外科学 | 169篇 |
综合类 | 25篇 |
一般理论 | 1篇 |
预防医学 | 101篇 |
眼科学 | 21篇 |
药学 | 93篇 |
肿瘤学 | 111篇 |
出版年
2021年 | 19篇 |
2020年 | 14篇 |
2019年 | 21篇 |
2018年 | 26篇 |
2017年 | 21篇 |
2016年 | 10篇 |
2015年 | 16篇 |
2014年 | 29篇 |
2013年 | 43篇 |
2012年 | 46篇 |
2011年 | 56篇 |
2010年 | 59篇 |
2009年 | 65篇 |
2008年 | 57篇 |
2007年 | 71篇 |
2006年 | 41篇 |
2005年 | 37篇 |
2004年 | 35篇 |
2003年 | 33篇 |
2002年 | 37篇 |
2001年 | 41篇 |
2000年 | 38篇 |
1999年 | 32篇 |
1998年 | 57篇 |
1997年 | 62篇 |
1996年 | 52篇 |
1995年 | 44篇 |
1994年 | 50篇 |
1993年 | 37篇 |
1992年 | 20篇 |
1991年 | 30篇 |
1990年 | 24篇 |
1989年 | 41篇 |
1988年 | 39篇 |
1987年 | 40篇 |
1986年 | 36篇 |
1985年 | 19篇 |
1984年 | 16篇 |
1983年 | 16篇 |
1982年 | 16篇 |
1981年 | 19篇 |
1980年 | 14篇 |
1979年 | 16篇 |
1978年 | 15篇 |
1977年 | 14篇 |
1976年 | 18篇 |
1975年 | 14篇 |
1973年 | 9篇 |
1972年 | 10篇 |
1970年 | 11篇 |
排序方式: 共有1634条查询结果,搜索用时 15 毫秒
41.
Premature termination appears to be a consistent problem in psychotherapy, showing up across client, treatment, and therapist types. As psychotherapy researchers and practitioners, it is important that we gain a better understanding of this negative psychotherapy event and identify methods for reducing its occurrence. This article introduces a special section on premature termination in psychotherapy. In addition to briefly introducing the articles contained in the special section, this article offers suggestions for future research on the topic of premature termination. 相似文献
42.
43.
44.
45.
Indeterminate colitis: the real story 总被引:3,自引:4,他引:3
Rudolph WG Uthoff SM McAuliffe TL Goode ET Petras RE Galandiuk S 《Diseases of the colon and rectum》2002,45(11):1528-1534
PURPOSE: Up to one in five patients undergoing surgery for ulcerative colitis will have ambiguous histology, with features of both ulcerative colitis and Crohn's disease, and are categorized as having indeterminate colitis. We hypothesized that functional outcomes in indeterminate colitis patients undergoing ileal pouch-anal anastomosis are comparable with those of ulcerative colitis patients undergoing ileal pouch-anal anastomosis. METHODS: Physician-conducted interviews of 120 consecutive ileal pouch-anal anastomosis patients with a preoperative diagnosis of ulcerative colitis were reviewed, with a mean follow-up of 54 months. All colectomy specimens were reviewed by a single pathologist. Any changes in histologic diagnosis from ulcerative colitis to indeterminate colitis or Crohn's disease, frequency of postoperative complications, pouch function, and long-term postoperative medication usage were recorded. RESULTS: Although postoperative fistulas were more common in indeterminate colitis than ulcerative colitis (26 vs. 10 percent; P = 0.02, chi-squared), no indeterminate colitis patient required a permanent ileostomy as compared with six ulcerative colitis patients. Long-term functional results were similar. Overall, two-thirds of patients developed pouchitis. Ulcerative colitis and Crohn's disease patients were more likely to have had >3 episodes of pouchitis (58 and 72 percent) compared with indeterminate colitis patients (29 percent; P = 0.006, chi-squared). A greater number of Crohn's disease patients required maintenance oral antibiotic therapy (64 percent) to achieve satisfactory functional results compared with both indeterminate colitis and ulcerative colitis patients (20 and 28 percent; P = 0.014, chi-squared). CONCLUSIONS: Although ileal pouch-anal anastomosis patients with indeterminate colitis have more postoperative fistulas, long-term function is equal to that of ulcerative colitis patients and better than Crohn's disease patients. Ileal pouch-anal anastomosis should be offered to patients with indeterminate colitis and those with severe colitis in whom clear differentiation between indeterminate colitis and ulcerative colitis cannot be made. 相似文献
46.
Background
Although bacterial cholangitis is frequently mentioned as a cause of secondary sclerosing cholangitis, it appears to be extremely rare, with only one documented case ever reported. 相似文献47.
Human interleukin-5 (IL-5) regulates the production of eosinophils in human bone marrow cultures: comparison and interaction with IL-1, IL-3, IL-6, and GMCSF 总被引:33,自引:1,他引:33
Recombinant human interleukin-5 (rhIL-5), in either liquid or semi- solid cultures, selectively induced eosinophil production from normal human bone marrow, with no activity on other cell lineages. The time course of eosinophil production induced by murine IL-5, rhIL-3, and rh granulocyte-macrophage colony stimulating factor (GMCSF) was similar to rhIL-5. The rate of eosinophil maturation in vitro was independent of the stimulating cytokine, mature eosinophils being produced after 4 to 5 weeks in liquid culture with each of these cytokines. The eosinophils produced in response to each cytokine were morphologically indistinguishable, and had the ultrastructural features of maturity except that the electron-dense material in the granules had not formed into crystalline cores. Neither rhIL-1 nor rhIL-6 alone, or in combination with rhIL-5 or rhIL-3, induced eosinophil differentiation or proliferation under the conditions used. rhIL-3 and rhGMCSF induced more eosinophil colonies than rhIL-5, rhIL-5 had an additive, not synergistic, effect on eosinophil colony production when combined with either rhIL-3 or rhGMCSF, suggesting that rhIL-5 stimulates a smaller and possibly different population of eosinophil progenitors. However, rhIL-5 induced the greatest eosinophil production in liquid cultures, suggesting that although it may act on a smaller population of precursors, it is able to stimulate more proliferative steps than either rhIL-3 or rhGMCSF. 相似文献
48.
Zielinsky A; Hirsh J; Straumanis G; Carter CJ; Gent M; Sackett DL; Hull R; Kelton JG; Powers P; Turpie AG 《Blood》1982,59(2):346-350
We have evaluated the fibrinogen/fibrin fragment E antigen assay as a diagnostic test in patients with clinically suspected venous thrombosis by comparing the results of this assay with venography in 272 patients. The result of the fragment E antigen assay was elevated in 79 of 80 patients with positive venograms for recent venous thrombosis (sensitivity 99%) and within the normal range in 161 of 192 patients with normal venograms (specificity 84%). The fragment E assay was also evaluated in 130 medical and surgical controls without evidence of venous thrombosis by leg scanning and the test was found to be relatively nonspecific. However, in the patient group under study, a correct clinical diagnosis of no thrombosis, based on a normal fragment E result, was made in 161 of 162 cases (negative predictive value of 99%). Therefore, a normal test result effectively excludes a diagnosis of venous thrombosis in clinically symptomatic patients. The assay, as currently performed, is technically demanding and takes 24 hr to complete. Therefore, it will have to be simplified before it can be applied to clinical practice. 相似文献
49.
Correlates of urinary, fecal, and dual incontinence in older African-American and white men and women 总被引:1,自引:0,他引:1
Markland AD Goode PS Burgio KL Redden DT Richter HE Sawyer P Allman RM 《Journal of the American Geriatrics Society》2008,56(2):285-290
OBJECTIVES: To determine prevalence and correlates of urinary (UI), fecal (FI), and dual (DI) incontinence in community‐dwelling older adults. DESIGN: Cross‐sectional, population‐based in‐home survey. SETTING: Three rural and two urban Alabama counties (1999–2001). PARTICIPANTS: Stratified random sample of 1,000 Medicare beneficiaries aged 65 and older: 25% African‐American men, 25% white men, 25% African‐American women, 25% white women. MEASUREMENTS: UI defined as involuntary urine loss at least monthly; FI defined as “In the past year, have you had any loss of control of your bowels, even a small amount that stained the underwear?” Independent variables were sociodemographics, medical history, and activities of daily living (ADLs) excluding toileting. Multinomial logistic regression models were constructed using UI, FI, and DI as dependent variables. RESULTS: UI, FI, and DI prevalences were 27%, 6%, and 6%, respectively. White women had higher prevalence of UI (41.1% vs 24.6%, P<.001) and DI (18.5% vs 8.0%, P=.07) but not FI (4.4% vs 3.8%, P=.83) than African‐American women. Men had no racial differences in prevalence (UI 22.2%, FI 7.7%, DI 4.6%). In women, UI, FI, and DI correlates included higher Charlson comorbidity score and depressive symptoms and greater ADL difficulty for UI and DI. In men, UI was associated with prostate disease and depressive symptoms; FI with chronic diarrhea, history of transient ischemic attack (TIA), and poor self‐perceived health; and DI with history of TIA, foot and leg swelling, and depressive symptoms. CONCLUSION: Women had racial differences as well as similar correlates of incontinence subtypes, whereas men did not. 相似文献
50.
Jessica C Fanzo Matthew M Graziose Klaus Kraemer Stuart Gillespie Jessica L Johnston Saskia de Pee Eva Monterrosa Jane Badham Martin W Bloem Alan D Dangour Richard Deckelbaum Achim Dobermann Patrizia Fracassi SM Moazzem Hossain John Ingram Johann C Jerling CJ Jones Stefanus Indrayana Jap Lynnda Kiess Quinn Marshall Keith Martin Anuradha Narayan Mary Amuyunzu-Nayamongo Fré Pepping Keith P West 《Advances in nutrition (Bethesda, Md.)》2015,6(6):639-647
Nearly all countries in the world today are burdened with malnutrition, manifesting as undernutrition, micronutrient deficiencies, and/or overweight and obesity. Despite some progress, efforts to alleviate malnutrition are hampered by a shortage in number, skills, and geographic coverage, of a workforce for nutrition. Here, we report the findings of the Castel Gandolfo workshop, a convening of experts from diverse fields in March 2014 to consider how to develop the capacity of a global cadre of nutrition professionals for the post-2015 development era. Workshop participants identified several requirements for developing a workforce for nutrition, including an ability to work as part of a multisectoral team; communication, advocacy, and leadership skills to engage decision makers; and a set of technical skills to address future challenges for nutrition. Other opportunities were highlighted that could immediately contribute to capacity development, including the creation of a consortium to link global North and South universities, online training modules for middle managers, and practical, hands-on experiences for frontline nutrition workers. Institutional and organizational support is needed to enable workshop recommendations on education and training to be effectively implemented and sustained. The findings from the Castel Gandolfo workshop can contribute to the delivery of successful nutrition-relevant actions in the face of mounting external pressures and informing and attaining the forthcoming Sustainable Development Goals. 相似文献