全文获取类型
收费全文 | 9498篇 |
免费 | 511篇 |
国内免费 | 6篇 |
专业分类
10015篇 |
出版年
2023年 | 78篇 |
2022年 | 135篇 |
2021年 | 279篇 |
2020年 | 172篇 |
2019年 | 185篇 |
2018年 | 258篇 |
2017年 | 240篇 |
2016年 | 302篇 |
2015年 | 397篇 |
2014年 | 458篇 |
2013年 | 640篇 |
2012年 | 661篇 |
2011年 | 631篇 |
2010年 | 384篇 |
2009年 | 304篇 |
2008年 | 437篇 |
2007年 | 392篇 |
2006年 | 379篇 |
2005年 | 376篇 |
2004年 | 300篇 |
2003年 | 240篇 |
2002年 | 237篇 |
2001年 | 208篇 |
2000年 | 188篇 |
1999年 | 166篇 |
1998年 | 65篇 |
1997年 | 61篇 |
1996年 | 70篇 |
1995年 | 56篇 |
1994年 | 64篇 |
1993年 | 39篇 |
1992年 | 123篇 |
1991年 | 119篇 |
1990年 | 89篇 |
1989年 | 95篇 |
1988年 | 88篇 |
1987年 | 92篇 |
1986年 | 90篇 |
1985年 | 96篇 |
1984年 | 82篇 |
1983年 | 52篇 |
1982年 | 50篇 |
1981年 | 42篇 |
1980年 | 49篇 |
1979年 | 78篇 |
1978年 | 58篇 |
1977年 | 49篇 |
1976年 | 42篇 |
1974年 | 39篇 |
1973年 | 45篇 |
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
91.
Sudhir Chandra Joshi Vishal Diwan Ashok J. Tamhankar Rita Joshi Harshada Shah Megha Sharma Ashish Pathak Ragini Macaden Cecilia St?lsby Lundborg 《PloS one》2015,10(5)
Background
Health care or biomedical waste, if not managed properly, can be of high risk to the hospital staff, the patients, the community, public health and the environment, especially in low and middle income settings where proper disposal norms are often not followed. Our aim was to explore perceptions of staff of an Indian rural tertiary care teaching hospital on hospital waste management.Method
A qualitative study was conducted using 10 focus group discussions (FGDs), with different professional groups, cleaning staff, nurses, medical students, doctors and administrators. The FGD guide included the following topics: (i) role of Health Care Waste Management (HCWM) in prevention of health care associated infections, (ii) awareness of and views about HCWM-related guidelines/legislation, (iii) current HCWM practices, (iv) perception and preparedness related to improvements of the current practices, and (v) proper implementation of the available guidelines/legislation. The FGDs were recorded, transcribed verbatim, translated to English (when conducted in Hindi) and analysed using content analysis.Results
Two themes were identified: Theme (A), ‘Challenges in integration of HCWM in organizational practice,’ with the categories (I) Awareness and views about HCWM, (II) Organizational practices regarding HCWM, and (III) Challenges in Implementation of HCWM; and Theme (B), ‘Interventions to improve HCWM,’ with three categories, (I) Educational and motivational interventions, (II) Organizational culture change, and (III) Policy-related interventions.Conclusion
A gap between knowledge and actual practice regarding HCWM was highlighted in the perception of the hospital staff. The participants suggested organizational changes, training and monitoring to address this. The information generated is relevant not merely to the microsystem studied but to other institutions in similar settings. 相似文献92.
Mesarwi Omar A. Sharma Ellora V. Jun Jonathan C. Polotsky Vsevolod Y. 《Sleep and biological rhythms》2015,13(1):2-17
Sleep and Biological Rhythms - It has recently become clear that obstructive sleep apnea (OSA) is an independent risk factor for the development of metabolic syndrome, a disorder of defective... 相似文献
93.
94.
Summary. The possibility that nitric oxide synthase (NOS) inhibitors influence dynorphin immunoreactivity following hyperthermia was
examined in a rat model using a pharmacological approach. Previous reports from our laboratory show that hyperthermia induces
an upregulation of NOS in several brain regions that seems to be instrumental in causing cell injury. Recent reports suggest
that nitric oxide (NO) can influence dynorphin neurotransmission in the normal brain as well as in several pathological states.
Since dynorphin is neurotoxic in different animal models of brain or spinal cord injury, it may be that the peptide will contribute
to the cell injury in hyperthermia. The present investigation was carried out to determine whether hyperthermia can influence
dynorphin immunoreactivity in the brain, and if so, whether inhibition of NOS will influence the peptide distribution in the
brain following heat stress. Rats subjected to hyperthermia at 38°C for 4 h in a biological oxygen demand incubator (BOD)
resulted in a marked upregulation of dynorphin immunoreactivity in several brain regions e.g., cerebral cortex, hippocampus,
cerebellum and brain stem. Pretreatment of rats with two potent NOS inhibitors, L-NAME (30 mg/kg/day, i.p. for 7 days) or
L-NMMA (35 mg/kg/day, i.p. for 7 days) significantly attenuated the dynorphin immunoreactivity in the brain. These drugs were
also able to reduce hyperthermia induced blood-brain barrier (BBB) permeability, brain edema formation and cell injury. Taken
together, our results suggest that (i) hyperthermia has the capacity to upregulate dynorphin immunoreactivity in the brain,
(ii) inhibition of NOS considerably attenuates the dynorphin immunoreaction following heat stress and (iii) upregulation of
dynorphin is somehow contributing to hyperthermia induced brain damage, not reported earlier.
Received July 3, 2001 Accepted August 6, 2001 Published online July 31, 2002 相似文献
95.
Arnebia hispidissima ethanolic extract, after chromatography, yielded a number of shikonin derivatives, which were identified as arnebin-5, arnebin-6, teracryl shikonin, arnebinone and acetyl shikonin. All these compounds were firstly reported from this plant species and evaluated to the anti-inflammatory activity of ethanolic extract and isolated shikonin derivatives, models with carrageenan-induced paw edema and complete Freund's adjuvant (CFA)-induced chronic arthritis in rats were conducted. The observed results indicated that pre-treatment with arnebinone significantly inhibited the carrageenan-induced paw edema and also suppressed the development of chronic arthritis induced by CFA. 相似文献
96.
97.
Pauline Maturana Joseph G. Graham Uma M. Sharma Daniel E. Voth 《Journal of bacteriology》2013,195(14):3269-3276
The intracellular bacterial agent of Q fever, Coxiella burnetii, translocates effector proteins into its host cell cytosol via a Dot/Icm type IV secretion system (T4SS). The T4SS is essential for parasitophorous vacuole formation, intracellular replication, and inhibition of host cell death, but the effectors mediating these events remain largely undefined. Six Dot/Icm substrate-encoding genes were recently discovered on the C. burnetii cryptic QpH1 plasmid, three of which are conserved among all C. burnetii isolates, suggesting that they are critical for conserved pathogen functions. However, the remaining hypothetical proteins encoded by plasmid genes have not been assessed for their potential as T4SS substrates. In the current study, we further defined the T4SS effector repertoire encoded by the C. burnetii QpH1, QpRS, and QpDG plasmids that were originally isolated from acute-disease, chronic-disease, and severely attenuated isolates, respectively. Hypothetical proteins, including those specific to QpRS or QpDG, were screened for translocation using the well-established Legionella pneumophila T4SS secretion model. In total, six novel plasmid-encoded proteins were translocated into macrophage-like cells by the Dot/Icm T4SS. Four newly identified effectors are encoded by genes present only on the QpDG plasmid from severely attenuated Dugway isolates, suggesting that the presence of specific effectors correlates with decreased virulence. These results further support the idea of a critical role for extrachromosomal elements in C. burnetii pathogenesis. 相似文献
98.
Sharma B. K. Kumawat Chandan Makinde O. D. 《Biomechanics and modeling in mechanobiology》2022,21(3):797-825
Biomechanics and Modeling in Mechanobiology - A numerical investigation of MHD blood flow through a stenosed permeable curved artery has been done in this study. Blood flow is considered in... 相似文献
99.
Muthu Valliappan Dhaliwal Manpreet Sharma Arunima Nair Divya Kumar H. Mohan Rudramurthy Shivaprakash M. Sehgal Inderpaul Singh Choudhary Hansraj Panda Naresh Chakrabarti Arunaloke Agarwal Ritesh 《Mycopathologia》2022,187(4):355-362
Mycopathologia - In experimental models, the expression of glucose-regulated protein 78 (GRP78) in endothelial cells played a role in the pathogenesis of mucormycosis. However, the role of GRP78 in... 相似文献
100.
Biology Bulletin - The increasing level of pollution in River Yamuna has turned it into sewage carrying drain, thus, distressing aquatic life as the river traverses downstream from Wazirabad (entry... 相似文献