全文获取类型
收费全文 | 1009篇 |
免费 | 103篇 |
国内免费 | 3篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 123篇 |
妇产科学 | 12篇 |
基础医学 | 103篇 |
口腔科学 | 33篇 |
临床医学 | 112篇 |
内科学 | 150篇 |
皮肤病学 | 16篇 |
神经病学 | 352篇 |
特种医学 | 38篇 |
外科学 | 31篇 |
综合类 | 15篇 |
预防医学 | 53篇 |
眼科学 | 10篇 |
药学 | 38篇 |
肿瘤学 | 27篇 |
出版年
2024年 | 3篇 |
2023年 | 13篇 |
2022年 | 4篇 |
2021年 | 10篇 |
2020年 | 10篇 |
2019年 | 11篇 |
2018年 | 26篇 |
2017年 | 20篇 |
2016年 | 21篇 |
2015年 | 26篇 |
2014年 | 35篇 |
2013年 | 46篇 |
2012年 | 35篇 |
2011年 | 29篇 |
2010年 | 40篇 |
2009年 | 48篇 |
2008年 | 29篇 |
2007年 | 30篇 |
2006年 | 25篇 |
2005年 | 30篇 |
2004年 | 19篇 |
2003年 | 22篇 |
2002年 | 28篇 |
2001年 | 20篇 |
2000年 | 18篇 |
1999年 | 30篇 |
1998年 | 35篇 |
1997年 | 42篇 |
1996年 | 50篇 |
1995年 | 32篇 |
1994年 | 29篇 |
1993年 | 28篇 |
1992年 | 22篇 |
1991年 | 23篇 |
1990年 | 19篇 |
1989年 | 29篇 |
1988年 | 19篇 |
1987年 | 14篇 |
1986年 | 24篇 |
1985年 | 28篇 |
1984年 | 18篇 |
1983年 | 19篇 |
1982年 | 20篇 |
1981年 | 7篇 |
1980年 | 12篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1968年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有1115条查询结果,搜索用时 15 毫秒
61.
PG Kareru JM Keriko GM Kenji GT Thiong'o AN Gachanja HN Mukiira 《African journal of traditional, complementary, and alternative medicines》2010,7(3):214-218
In this study, Tithonia diversifolia Helms. (A Gray), Aloe secundiflora (Miller) and Azadirachta indica (A. Juss) plant extracts were used to make herbal soaps while Thevetia peruviana (Schum) seed oil was used to make a herbal lotion for skincare. The soaps were tested for the growth inhibition of Escherichia coli, and Candida albicans. The lotion was evaluated against Staphylococcus aureus and E.coli. Although Tithonia diversifolia soap exhibited the highest inhibitory effect on the test bacterial strains, it had the least inhibition against C. albicans. Results from this study indicated that the ‘Tithonia diversifolia’ soap would have superior skin protection against the tested bacteria but would offer the least skin protection against C. albicans. The herbal lotion inhibited S. aureus and E. coli in a concentration dependent manner, however, the inhibitory effect was more pronounced on S. aureus. 相似文献
62.
The morphological distribution of acetylcholine receptors in normal and denervated rat tibialis anterior and soleus muscles was studied by in vitro quantitative autoradiography with [3H]acetylcholine (ACh). In normal muscles [3H]ACh binding was restricted to the neuromuscular junction, while denervated muscles showed binding also in extrajunctional areas. After denervation there was also an increase in the junctional binding. 相似文献
63.
Christopher Gillberg Eva Billstedt Valter Sundh I. Carina Gillberg 《Journal of autism and developmental disorders》2010,40(3):352-357
The purposes of the present study were to establish the mortality rate in a representative group of individuals (n = 120) born in the years 1962–1984, diagnosed with autism/atypical autism in childhood and followed up at young adult age (≥18 years of age), and examine the risk factors and causes of death. The study group, which constituted a total population sample of children with these diagnoses, were followed up in Swedish registers. Nine (7.5%) of the 120 individuals with autism had died at the time of follow-up, a rate 5.6 times higher than expected. The mortality rate was significantly higher among the females. Associated medical disorders (including epilepsy with cognitive impairment) and accidents accounted for most of the deaths, and it was not possible to determine whether autism “per se” actually carries an increased mortality risk. 相似文献
64.
Ventilator-associated pneumonia (VAP) is a common cause of morbidity, antibiotic use, increased length of stay and, possibly,
increased mortality in ICU patients. Colonization of the oropharyngeal cavity with potentially pathogenic micro-organisms
is instrumental in the pathogenesis of VAP, and selective oropharyngeal decontamination (SOD) with antibiotics (AB-SOD) or
antiseptics, such as chlorhexidine gluconate (CHX-SOD), has been associated with reduced incidences of VAP. In a recent issue
of Critical Care Scannapieco and colleagues investigated differences in oropharyngeal colonization between mechanically ventilated patients
receiving oropharyngeal decontamination with 0.12% CHX-SOD either once or twice daily compared to placebo. CHX-SOD was associated
with a reduction in Staphylococcus aureus colonization, but the study was underpowered to demonstrate a reduction in VAP incidence. We urgently need well-designed
and adequately powered studies to evaluate the potential benefits of CHX-SOD on patient outcome in ICUs. 相似文献
65.
Ageing appearance in China: biophysical profile of facial skin and its relationship to perceived age
AE Mayes PG Murray DA Gunn CC Tomlin SD Catt YB Wen LP Zhou HQ Wang M Catt SP Granger 《Journal of the European Academy of Dermatology and Venereology》2010,24(3):341-348
Background Perceived age is important to women and is a primary driver for topical product use and facial cosmetic surgery. Changes in facial features and biophysical skin parameters with chronological age and their associations with perceived age have not been described in Asian populations. Objective To investigate the relationship between biophysical properties of the skin, visual features of skin ageing and perceived facial age in Chinese women. Methods Facial photographs were collected of 250 Chinese women, aged 25–70 years in Shanghai, China. The perceived facial age was determined and related to the chronological age for each participant and to a range of visual assessments of skin appearance and objective biophysical measurements of the skin. The profile of changes in these parameters with age was investigated together with the differences in those parameters for women judged to look younger than their chronological age and those judged to look older than their chronological age. Results Large discrepancies in perceived age (up to 29 years) were found in women of the same chronological age. Each objective skin measure and visual assessment parameter had a stronger correlation with perceived age than with chronological age. The strongest relationships to perceived age were for wrinkles and hyperpigmentation. Skin colour, hydration and trans‐epidermal water loss (TEWL) had weaker associations with perceived age. Women judged to look older than their chronological age had significantly higher scores than those judged to look younger for coarse wrinkles and hyperpigmentation across all age groups. The appearance differences between these groups were evident in composite facial images of the same average chronological age. Conclusions We have identified the skin attributes which differ with perceived age in Chinese women. Perceived age is a better measure of the biological age of facial skin than is chronological age in this population. 相似文献
66.
KI Wheeler GM Schmölzer CJ Morley PG Davis 《Acta paediatrica (Oslo, Norway : 1992)》2011,100(1):67-70
Background: Ventilator frequency is one of the determinants of tidal volume delivery during high‐frequency ventilation. Clinicians increasingly use data on ventilator displays to inform their decisions. Aim: To measure the frequencies delivered by the Dräger Babylog 8000plus ventilator when used in high‐frequency mode. Methods: Ventilator waveforms using a test lung were recorded at the full range of settings 5–20 Hz using Spectra software at 1000 Hz. The changes in frequency produced by a 1‐ Hz change in set frequency were calculated. Actual and displayed frequencies were compared. Results: For settings up to 12 Hz, median (range) difference between set and delivered frequencies was 0 (?0.4 to +0.1) Hz. Above 12 Hz, delivered frequency varied by ?0.3 (?1.9 to +0.3) Hz. For 1‐ Hz changes in frequency settings, in the range 5–12 Hz, 1‐ Hz changes produced a change in delivered frequency of 1.0 (0.6–1.4) Hz. Above 12 Hz, the corresponding changes were 0.7 (0–2.9) Hz. The ventilator displays the set frequency during operation rather than the delivered frequency. Conclusion: At 12 Hz and below, the differences between set and delivered frequencies were relatively small compared with those at 13 Hz and higher. Above 13 Hz, the difference between set and delivered frequencies was up to 2.9 Hz. Some frequency setting changes did not result in a change in delivered frequency. 相似文献
67.
68.
Myocardial infarction,patient decision delay and help‐seeking behaviour: a thematic analysis
下载免费PDF全文
![点击此处可从《Journal of clinical nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
69.
70.