全文获取类型
收费全文 | 19485篇 |
免费 | 2033篇 |
国内免费 | 27篇 |
专业分类
耳鼻咽喉 | 152篇 |
儿科学 | 743篇 |
妇产科学 | 659篇 |
基础医学 | 2685篇 |
口腔科学 | 391篇 |
临床医学 | 2327篇 |
内科学 | 3989篇 |
皮肤病学 | 200篇 |
神经病学 | 1427篇 |
特种医学 | 732篇 |
外科学 | 2648篇 |
综合类 | 597篇 |
一般理论 | 43篇 |
预防医学 | 2318篇 |
眼科学 | 300篇 |
药学 | 1393篇 |
1篇 | |
中国医学 | 15篇 |
肿瘤学 | 925篇 |
出版年
2021年 | 315篇 |
2020年 | 204篇 |
2019年 | 304篇 |
2018年 | 333篇 |
2017年 | 271篇 |
2016年 | 248篇 |
2015年 | 292篇 |
2014年 | 423篇 |
2013年 | 634篇 |
2012年 | 848篇 |
2011年 | 953篇 |
2010年 | 526篇 |
2009年 | 503篇 |
2008年 | 781篇 |
2007年 | 811篇 |
2006年 | 757篇 |
2005年 | 803篇 |
2004年 | 721篇 |
2003年 | 708篇 |
2002年 | 676篇 |
2001年 | 608篇 |
2000年 | 643篇 |
1999年 | 561篇 |
1998年 | 326篇 |
1997年 | 286篇 |
1996年 | 311篇 |
1995年 | 257篇 |
1994年 | 214篇 |
1993年 | 202篇 |
1992年 | 453篇 |
1991年 | 497篇 |
1990年 | 453篇 |
1989年 | 442篇 |
1988年 | 381篇 |
1987年 | 418篇 |
1986年 | 368篇 |
1985年 | 367篇 |
1984年 | 302篇 |
1983年 | 257篇 |
1982年 | 166篇 |
1981年 | 159篇 |
1979年 | 196篇 |
1978年 | 150篇 |
1977年 | 156篇 |
1976年 | 131篇 |
1975年 | 122篇 |
1974年 | 182篇 |
1973年 | 164篇 |
1972年 | 132篇 |
1970年 | 134篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Elizabeth Campbell Ph.D. Danna Peterkin R.N. Richard Abbott M.B. B.S. John Rogers M.B. B.S. 《Preventive medicine》1997,26(6):801-807
Background.Computers that collect data from patients and provide both patients and practitioners with printed feedback on a range of health risks are a tool for assisting general practitioners with preventive care. This study assessed the impact of computer-generated printed feedback on cervical screening among women who were underscreened for cervical cancer.Method.Female attenders at two Australian general practices were randomly allocated to Experimental or Control groups. Women in both groups completed a health risk survey on a touch screen computer prior to their consultation. Those in the Experimental group received printed pages summarizing their results, including their eligibility for cervical screening and last Pap test, for themselves and their doctor. The number and proportion of underscreened women who had a Pap test in the 6 months after completing the computer survey, as determined by pathology records, were examined.Results.Of the 679 participants, 139 were classified as underscreened on the basis of self-report (74 Experimental, 65 Control) and 272 on the basis of their pathology records (148 Experimental, 124 Control). Overall about one-third of women had a test in the 6-month period, and the differences between the groups were not significant for women overall (18–70 years) or for women 18–49 years. Among women 50–70 who were underscreened based on self-report, those receiving the printout were more likely to have a Pap test in the next 6 months (P< 0.05). This pattern was also evident, but did not reach statistical significance, for older women who were underscreened based on pathology records.Conclusions.We are unable to draw conclusions regarding the effectiveness of the computer system due to the modest proportions of women screened, the small numbers, and the fact that the computer survey may have created an intervention effect in the Control group. As the study suggests the computer system is acceptable to women and may be effective for encouraging screening among older women, further exploration of the system is desirable. 相似文献
12.
13.
14.
H L Elliott P A Meredith L Campbell J L Reid 《Clinical pharmacology and therapeutics》1988,43(5):554-560
An exaggerated fall in blood pressure has been reported with the combination of an alpha 1-blocker and a calcium antagonist. This study investigated, in a placebo-controlled, randomized crossover trial, the clinical usefulness of the combination of prazosin (2 mg b.i.d.) and verapamil (160 mg b.i.d.). Therapeutic efficacy was monitored at regular outpatient visits: average supine and erect blood pressures were, respectively, 175/99 and 176/103 mm Hg with placebo, 160/91 and 164/96 mm Hg with single drug treatment, and 152/84 and 152/89 mm Hg with combination therapy. This significant and clinically useful reduction in blood pressure had an overall magnitude of approximately 28/18 mm Hg (supine) and 29/19 mm Hg (erect). Further measurements were made during a series of intensive study days, and the most important additional finding was a pharmacokinetic interaction that resulted in increased peak concentrations and bioavailability of prazosin. In conclusion, the combination of prazosin and verapamil proved effective in the treatment of 12 patients with essential hypertension who had been poorly responsive to conventional treatment with a beta-blocker and thiazide diuretic. 相似文献
15.
R. A. Bradbury D. Shirkhedkar A. R. Glanville L. V. Campbell 《Internal medicine journal》2009,39(6):384-388
Background: The aim of this study was to determine whether pre-existing diabetes mellitus increases the risk of rejection, infection and/or death in cystic fibrosis patients undergoing bilateral sequential single-lung transplantation.
Methods: A retrospective audit of 25 consecutive patients with cystic fibrosis who underwent bilateral sequential single-lung transplantation between 1 January 2003 and 31 December 2005 at a tertiary referral hospital was carried out.
Results: Although 32% patients had diabetes diagnosed before lung transplantation, 92% had random blood glucose levels ≥11.1 mmol/L requiring insulin during admission. Patients with pre-existing diabetes had increased infection-related (3.9 vs 1.2, P = 0.01) and putative rejection-related (1.4 vs 0.5, P = 0.04) hospital admissions post-transplantation compared with those without diabetes pre-transplant. During the period of observation, four of eight patients with a prior diagnosis of diabetes died compared with none of 17 patients without prior diabetes ( P = 0.0055).
Conclusion: Almost all cystic fibrosis patients develop hyperglycaemia after lung transplantation, but patients with prior diabetes have more complication-related admissions to hospital and a higher mortality rate. 相似文献
Methods: A retrospective audit of 25 consecutive patients with cystic fibrosis who underwent bilateral sequential single-lung transplantation between 1 January 2003 and 31 December 2005 at a tertiary referral hospital was carried out.
Results: Although 32% patients had diabetes diagnosed before lung transplantation, 92% had random blood glucose levels ≥11.1 mmol/L requiring insulin during admission. Patients with pre-existing diabetes had increased infection-related (3.9 vs 1.2, P = 0.01) and putative rejection-related (1.4 vs 0.5, P = 0.04) hospital admissions post-transplantation compared with those without diabetes pre-transplant. During the period of observation, four of eight patients with a prior diagnosis of diabetes died compared with none of 17 patients without prior diabetes ( P = 0.0055).
Conclusion: Almost all cystic fibrosis patients develop hyperglycaemia after lung transplantation, but patients with prior diabetes have more complication-related admissions to hospital and a higher mortality rate. 相似文献
16.
17.
Insulin dose-response characteristics for suppression of glycerol release and conversion to glucose in humans 总被引:7,自引:0,他引:7
To compare the dose-response characteristics for suppression of lipolysis and suppression of glucose production by insulin, 13 normal nonobese individuals were infused with insulin at rates of 0.1, 0.2, 0.4, 0.8, and 1.6 mU X kg-1 X min-1 while normoglycemia was maintained with the glucose clamp technique. Glucose appearance and glycerol appearance (taken as index of lipolysis) were measured isotopically with simultaneous infusions of 3-[3H]glucose and U-[14C]glycerol. Baseline glucose and glycerol rates of appearance were 14 +/- 0.5 and 1.7 +/- 0.2 mumol X kg-1 X min-1, respectively. Approximately 3% of plasma glucose originated from glycerol, and this accounted for approximately 50% of glycerol disposal. During the insulin infusions, arterial insulin (basal, 9.8 +/- 0.6 microU/ml) increased to 14 +/- 0.5, 20 +/- 0.5, 31 +/- 1, 58 +/- 2, and 104 +/- 6 microU/ml; calculated portal venous insulin (basal, 24 +/- 2 microU/ml) increased to 26 +/- 1, 32 +/- 3, 70 +/- 4, and 115 +/- 6 microU/ml. The rate of glucose appearance was suppressed 100%, whereas the rate of appearance of glycerol was maximally suppressed only 85%. Nevertheless, the insulin concentration that produced half-maximal suppression of glucose appearance was twice as great as that required for half-maximal suppression of glycerol appearance (26 +/- 2 vs. 13 +/- 2 microU/ml, P less than .001). Insulin decreased both the absolute rate of glycerol conversion to plasma glucose and the percent of glycerol disposal appearing in plasma glucose (both P less than .001).(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
18.
19.
Stimulation by mitogens and neuronal membranes of lymphocytes from patients with motor neurone disease 总被引:1,自引:0,他引:1
Jaqueline Aspin Roger Harrison Ahmed Jehanli George Lunt Malcolm Campbell 《Journal of neuroimmunology》1986,11(1):31-40
Stimulation of lymphocytes from motor neurone disease patients by either concanavalin A or PHA was shown to be significantly depressed relative to that from normal controls, as assayed by incorporation of [3H]thymidine or [3H]leucine or by glucose uptake. Corresponding significant differences were not shown by assays based upon incorporation of [3H]uridine or of lactate release. Lymphocytes from 4 out of 14 motor neurone disease patients showed a blastogenic response to membranes from rat spinal cord cells, compared with those from 0 out of 9 normal controls. These results not only suggest the possibility of an impaired cellular immune control in MND patients but also indicate the presence of lymphocytes sensitised specifically to neuronal membrane components. 相似文献
20.
K Campbell 《Leukemia》2005,19(9):1704-1705