全文获取类型
收费全文 | 3285篇 |
免费 | 235篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 19篇 |
儿科学 | 116篇 |
妇产科学 | 31篇 |
基础医学 | 460篇 |
口腔科学 | 68篇 |
临床医学 | 290篇 |
内科学 | 708篇 |
皮肤病学 | 115篇 |
神经病学 | 110篇 |
特种医学 | 71篇 |
外科学 | 538篇 |
综合类 | 144篇 |
一般理论 | 2篇 |
预防医学 | 285篇 |
眼科学 | 79篇 |
药学 | 310篇 |
中国医学 | 40篇 |
肿瘤学 | 143篇 |
出版年
2023年 | 25篇 |
2022年 | 88篇 |
2021年 | 119篇 |
2020年 | 76篇 |
2019年 | 105篇 |
2018年 | 134篇 |
2017年 | 78篇 |
2016年 | 85篇 |
2015年 | 87篇 |
2014年 | 135篇 |
2013年 | 172篇 |
2012年 | 256篇 |
2011年 | 214篇 |
2010年 | 119篇 |
2009年 | 110篇 |
2008年 | 184篇 |
2007年 | 185篇 |
2006年 | 190篇 |
2005年 | 145篇 |
2004年 | 125篇 |
2003年 | 135篇 |
2002年 | 103篇 |
2001年 | 77篇 |
2000年 | 81篇 |
1999年 | 57篇 |
1998年 | 16篇 |
1997年 | 19篇 |
1996年 | 15篇 |
1995年 | 16篇 |
1994年 | 10篇 |
1993年 | 15篇 |
1992年 | 50篇 |
1991年 | 36篇 |
1990年 | 24篇 |
1989年 | 47篇 |
1988年 | 20篇 |
1987年 | 17篇 |
1986年 | 23篇 |
1985年 | 10篇 |
1984年 | 11篇 |
1983年 | 17篇 |
1981年 | 8篇 |
1980年 | 6篇 |
1979年 | 7篇 |
1978年 | 9篇 |
1976年 | 5篇 |
1975年 | 7篇 |
1973年 | 8篇 |
1966年 | 4篇 |
1943年 | 4篇 |
排序方式: 共有3529条查询结果,搜索用时 390 毫秒
61.
Md. Mahbubul Alam Md. A. Rashed Md. Musfiqur Rahman Mohammed
M. Rahman Yuki Nagao Mohammad A. Hasnat 《RSC advances》2018,8(15):8071
Pd nanoparticles were electrochemically immobilized on a Pt surface in the presence of sodium dodecyl sulfate (SDS) molecules to study the electrokinetics of arsenite oxidation reactions and the corresponding sensing activities. The X-ray photoelectron spectroscopy (XPS) analysis showed that on the Pt surface, Pd atoms exist as adatoms and the contents of Pd(0) and Pd(ii) were 75.72 and 24.28 at%, respectively, and the particle sizes were in the range of 61–145 nm. The experimental results revealed that the catalytic efficiency as well as the charge transfer resistance (at the redox potential of the Fe(ii)/Fe(iii) couple) increased in the order of Pt < Pt–Pd < Pt–Pdsds. A Pt–Pdsds electrode exhibited an open circuit potential (OCP) of 0.65 V in acidic conditions; however, when 50.0 mM NaAsO2 was present, the OCP value shifted to 0.42 V. It has been projected that the As(iii) oxidation proceeds using a sequential pathway: As(iii) → As(iv) → As(v). After optimization of the square wave voltammetric data, the limits of detection of As(iii) were obtained as 1.3 μg L−1 and 0.2 μg L−1 when the surface modification of the Pt surface was executed with Pd particles in the absence and presence of the SDS surfactant, respectively. Finally, real samples were analyzed with excellent recovery performance.Amplification of true surface area can be improved when Pd particles are deposited on a substrate in the presence of sodium dodecyl sulfate (SDS) surfactant. In acidic medium, As(iii) undergoes a two-step oxidation process. 相似文献
62.
Fazle Rabbi Chowdhury Md. Mustafezur Rahman Parash Ullah Abdul Mumith Ruhan Md. Shafiqul Bari M. M. Jahangir Alam 《Clinical toxicology (Philadelphia, Pa.)》2018,56(9):820-827
Background: Treatment of acute organophosphorus (OP) insecticide poisoning is difficult, with many patients dying despite best care. Pre-clinical studies have shown benefit from salbutamol, possibly due speeding alveolar fluid clearance or reducing bronchoconstriction. In this small pilot dose-response study, we aimed to explore whether addition of nebulized salbutamol to standard care might improve resuscitation.Methods: We performed a single-blind phase II study comparing the effect of two different doses of nebulized salbutamol versus saline placebo, in addition to standard treatment. Primary outcome was oxygen saturations over the first 60?min of resuscitation; secondary outcomes included heart rate, incidence of dysrhythmias, time to ‘atropinization’, atropine dose required, and mortality.Result: Seventy-five patients were randomized to receive 5?mg (Salb5, n?=?25) or 2.5mg (Salb2.5, n?=?25) of salbutamol, or saline placebo (NoSalb, n?=?25), by nebulizer. Oxygen saturations did not differ between groups over the first 60?min of resuscitation (median AUC NoSalb: 1376 [95% CI 1282 to 1470], Salb2.5: 1395 [1305 to 1486], Salb5: 1233 [1100 to 1367]; p?=?.9898). Heart rate was also similar across the three arms. Median time to full atropinization, and atropine dose required, were the same for all three arms (NoSalb 15.0 [10–16] min and 12.6 [8.0–13.4] mg, Salb2.5 15.0 [10–16] min and 12.6 [9.3–16.8] mg, and Salb5 15.0 [10–20] min and 12.6 [10.7–20.6] mg; p?=?.4805 and p?=?.1871, respectively). Three (12%) patients died in the Salb2.5 and Salb5 groups and two (8%) in the NoSalb group.Conclusion: This pilot study, within the limitations of its small size and variation between patients, found no apparent evidence that administration of nebulized salbutamol improved resuscitation of patients with acute OP insecticide self-poisoning. The data obtained provides a basis to design further studies to ultimately test the role of salbutamol in OP insecticide poisoning. 相似文献
63.
64.
Jahangir ABDI Behnaz AKHOUNDI Mehdi MOHEBALI Abolhasan GHADERIPOUR Zahra KAKOEE Faezeh NAJAFI 《Iranian Journal of Parasitology》2015,10(1):56-61
Background:
Visceral leishmaniasis (VL) as one of the most important human parasitic disease is endemic in some parts of Iran. Several cases of VL have been reported recently in the Ilam Province. The current study aimed to assess the present status of human VL in the region.Methods:
A random cluster sampling method was used to collect 456 serums samples from the children up to 12 years of age and 10% of adults living in urban and rural areas of the province. All the collected serum samples were tested by direct agglutination test (DAT) to detect anti- Leishmania infantum antibodies.Results:
Of the examined 456 serum samples with direct agglutination test (DAT), only 21 (0.43%) sera showed anti- Leishmania antibodies at titers 1:400 and higher. Distribution of anti- Leishmania antibodies titers were: 1:400(n=4), 1:800(n=11), 1:1600(n=3), 1:3200(n=1), and 1:6400(n=1). Individuals with titers ≥1:3200 showed clinical signs and symptoms such as fever and splenomegaly. The highest and lowest seropositivity were observed in the age groups of 5–9 and >15 years old, respectively. There were no significant difference between the rate of seropositivity in males and females.Conclusion:
VL with a low prevalence circulates in some parts of Ilam province, particularly in the southern parts. Complementary studies should be needed to find animal reservoir hosts and vectors. Furthermore, health systems and physicians should pay particular attention to the disease. 相似文献65.
Design,Synthesis, and Biological Evaluation of Thiazolidine‐2,4‐dione Conjugates as PPAR‐γ Agonists 下载免费PDF全文
66.
67.
Spindler L. Alam A. Fathallah N. Rentien A.-L. Draullette M. Pommaret E. Thierry M.-L. Mituialy A. El Abbes L. Aubert M. Benfredj P. Far E. Safa Beaussier H. de Parades V. 《Techniques in coloproctology》2022,26(2):143-146
Techniques in Coloproctology - The aim of our study was to assess the efficacy of sinus laser therapy (SiLaT) for the treatment of pilonidal disease. All adult patients treated with SiLaT in our... 相似文献
68.
Dr. W. J. Andrews R. W. Henry M. J. Alam K. G. M. M. Alberti K. D. Buchanan 《Diabetologia》1983,25(4):372-374
The plasma GIP response to an oral 50 g glucose tolerance test has been compared in eight non-obese human subjects after 12 and 36 h of fasting. Basal plasma GIP and basal plasma insulin concentrations were similar after 12 and 36 h of fasting. Basal blood glucose was lower after 36 h fasting than after 12 h fasting (p less than 0.0125). After 36 h fasting the oral glucose tolerance test stimulated higher blood glucose concentrations at 60, 90 and 120 min (p less than 0.0125) and higher plasma insulin concentrations at similar time points (p less than 0.05), but stimulated plasma GIP concentrations were similar after 12 and 36 h fasts. These findings show that the increased insulinotrophic effect of oral glucose after 36 h fasting in non-obese subjects is not due to an associated augmentation of the glucose-induced GIP response. 相似文献
69.
70.
Hahn T Bunworasate U George MC Bir AS Chinratanalab W Alam AR Bambach B Baer MR Slack JL Wetzler M Becker JL McCarthy PL 《Bone marrow transplantation》2003,32(2):145-150
Volume reduction of umbilical cord blood (UCB) units before infusion is standard in most transplant centers. We examined 26 patients who underwent transplantation from May 1997 to December 2001 with unmanipulated (n=18) or volume-reduced (n=8) UCB units for engraftment. Of 18 unmanipulated UCBT patients, 16 achieved ANC >500/mm(3), a median of 26 days (range, 16-104) post-UCBT; two died before engraftment on days +2 and +14. Of 18 unmanipulated UCBT patients, 10 achieved platelet recovery, a median of 60.5 days (range, 41-144) post-UCBT; eight patients died before platelet recovery +2 to +255 days post-UCBT. These results are similar to several reported studies and our series utilizing volume-reduced UCB units for UCBT. At a median follow-up of 29.5 months, the 100-day and 3-year overall survivals of unmanipulated UCBT were 61.1% (95% CI, 38.6-83.6) and 48.6% (95% CI, 24.8-72.4) and of volume-reduced UCBT were 60% (95% CI, 24.4-95.6) and 22.5% (95% CI, 0-58.7). There was no serious toxicity from UCB infusion using unmanipulated UCB units. We conclude that unmanipulated UCB units may be infused safely into UCBT patients with adequate engraftment and survival. 相似文献