全文获取类型
收费全文 | 2559篇 |
免费 | 211篇 |
国内免费 | 15篇 |
专业分类
耳鼻咽喉 | 44篇 |
儿科学 | 90篇 |
妇产科学 | 92篇 |
基础医学 | 311篇 |
口腔科学 | 82篇 |
临床医学 | 245篇 |
内科学 | 518篇 |
皮肤病学 | 70篇 |
神经病学 | 104篇 |
特种医学 | 140篇 |
外国民族医学 | 5篇 |
外科学 | 298篇 |
综合类 | 44篇 |
预防医学 | 174篇 |
眼科学 | 60篇 |
药学 | 311篇 |
中国医学 | 12篇 |
肿瘤学 | 185篇 |
出版年
2023年 | 34篇 |
2022年 | 130篇 |
2021年 | 207篇 |
2020年 | 113篇 |
2019年 | 134篇 |
2018年 | 183篇 |
2017年 | 115篇 |
2016年 | 109篇 |
2015年 | 102篇 |
2014年 | 124篇 |
2013年 | 184篇 |
2012年 | 213篇 |
2011年 | 190篇 |
2010年 | 128篇 |
2009年 | 94篇 |
2008年 | 98篇 |
2007年 | 84篇 |
2006年 | 82篇 |
2005年 | 96篇 |
2004年 | 76篇 |
2003年 | 59篇 |
2002年 | 49篇 |
2001年 | 15篇 |
2000年 | 13篇 |
1999年 | 27篇 |
1998年 | 7篇 |
1997年 | 7篇 |
1996年 | 7篇 |
1995年 | 3篇 |
1994年 | 5篇 |
1993年 | 2篇 |
1992年 | 7篇 |
1991年 | 15篇 |
1990年 | 11篇 |
1989年 | 9篇 |
1988年 | 9篇 |
1987年 | 5篇 |
1986年 | 4篇 |
1985年 | 4篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1980年 | 2篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1975年 | 3篇 |
1973年 | 2篇 |
1971年 | 2篇 |
1965年 | 1篇 |
1935年 | 1篇 |
排序方式: 共有2785条查询结果,搜索用时 31 毫秒
51.
Neda Javadi Faridah Abas Ahmed Mediani Azizah Abd Hamid Alfi Khatib Sanimah Simoh Khozirah Shaari 《Yao wu shi pin fen xi = Journal of food and drug analysis.》2015,23(3):433
Cosmos caudatus, which is a commonly consumed vegetable in Malaysia, is locally known as “Ulam Raja”. It is a local Malaysian herb traditionally used as a food and medicinal herb to treat several maladies. Its bioactive or nutritional constituents consist of a wide range of metabolites, including glucosinolates, phenolics, amino acids, organic acids, and sugars. However, many of these metabolites are not stable and easily degraded or modified during storage. In order to investigate the metabolomics changes occurring during post-harvest storage, C. caudatus samples were subjected to seven different storage times (0 hours, 2 hours, 4 hours, 6 hours, 8 hours, 10 hours, and 12 hours) at room temperature. As the model experiment, the metabolites identified by gas chromatography-mass spectrometry (GC-MS) were correlated with α-glucosidase inhibitory activity analyzed with multivariate data analysis (MVDA) to find out the variation among samples and metabolites contributing to the activity. Orthogonal partial least squares (OPLS) analysis was applied to investigate the metabolomics changes. A profound chemical alteration, both in primary and secondary metabolites, was observed. The α-tocopherol, catechin, cyclohexen-1-carboxylic acid, benzoic acid, myo-inositol, stigmasterol, and lycopenecompoundswerefoundtobethediscriminatingmetabolitesatearlystorage;however, sugars such as sucrose, α-d-galactopyranose, and turanose were detected, which was attributed to the discriminating metabolites for late storage. The result shows that the MVDA method is a promising technique to identify biomarker compounds relative to storage at different times. 相似文献
52.
53.
54.
Doaa S. Ibrahim Marwa A. E. Abd El‐Maksoud 《International journal of experimental pathology》2015,96(2):87-93
Diabetic nephropathy is a clinical syndrome characterized by albuminuria, hypertension and progressive renal insufficiency. The aim of this study was to investigate the effect of strawberry (Fragaria × ananassa) leaf extract on diabetic nephropathy in rats. Streptozotocin (STZ) diabetic rats were orally treated with three doses (50, 100 and 200 mg/kg) of strawberry leaf extract for 30 days. Nephropathy biomarkers in plasma and kidney were examined at the end of the experiment. The three doses of strawberry leaf extract significantly decreased the levels of blood glucose, urea nitrogen, plasma creatinine, kidney injury molecule (Kim)‐1, renal malondialdehyde (MDA), tumour necrosis factor alpha (TNF‐α), interleukin (IL)‐ 6 and caspase‐3 in diabetic rats. Meanwhile, the levels of plasma insulin, albumin, uric acid, renal catalase (CAT), superoxide dismutase (SOD) and vascular endothelial growth factor A (VEGF‐A) were significantly elevated in diabetic rats treated with strawberry leaf extract. These results indicate the role of strawberry leaves extract as anti‐diabetic, antioxidant, anti‐inflammatory and anti‐apoptosis in diabetic nephropathy. 相似文献
55.
The efficiency of Poly(ADP‐Ribose) Polymerase (PARP) cleavage on detection of apoptosis in an experimental model of testicular torsion 下载免费PDF全文
Pınar Aslan Koşar Hamdi Tuncer Abdülhadi Cihangir Uğuz Javier Espino Palma Hakan Darıcı İbrahim Onaran Bilal Çiğ Alim Koşar Ana Beatriz Rodriguez Moratinos 《International journal of experimental pathology》2015,96(5):294-300
The aim of this study was to evaluate the histopathological and apoptotic changes occurring in the rat ipsilateral and contralateral testes, after experimental spermatic cord torsion, and to explore and the role of poly(ADP‐ribose) polymerase (PARP) cleavage in testicular torsion–detorsion injury. A total of 37 Wistar albino rats were subjected to 720° unilateral spermatic cord torsion for 1, 2 and 4 h, followed by 4‐h reperfusion, or else to a sham operation (control group). Histology of the testicle was evaluated using haematoxylin–eosin (H&E) staining and Johnsen's scoring system. Germ cell apoptosis was evaluated via active caspase‐3 immunostaining, and PARP expression levels were evaluated via Western blotting. The mean Johnsen's tubular biopsy scores (JTBS) of the ipsilateral testicles were lower for all torsion groups than for the controls (P < 0.05), but the JTBS of the contralateral testicles were only lower in the 4‐h torsion group (P < 0.05). The mean apoptosis score (AS) of the ipsilateral and contralateral testicles was significantly higher in the torsion groups than in the sham group. AS increased correlatively with torsion time, in both testicles. The effect of testicular torsion on PARP cleavage was time dependent, with the highest effect observed after 4 h of testicular torsion (P < 0.05). Testicular torsion caused time‐dependent histological changes, apoptosis and increases in PARP cleavage. Our results suggest that testicular torsion–detorsion injury caused cell damage and germ cell apoptosis that apparently involved cleavage of PARP. Increased PARP cleavage could, in turn, lead to enhanced apoptosis. 相似文献
56.
Aim of the work
To investigate sleep problems in rheumatoid arthritis (RA) patients and to correlate sleep scores with disease characteristics and activity.Patients and methods
100 RA patients and 40 matched controls were included. Disease activity score (DAS28), visual analogue scale (VAS) for pain, modified health assessment questionnaire (MHAQ) and medical outcomes study short form-36 (SF-36) were assessed and the van der Heijde-modified Sharp score (vdHSS) calculated. The Pittsburgh Sleep Quality Index (PSQI) was used to investigate the sleeping habits, sleep difficulty was assessed using the Athens Insomnia Scale (AIS) and daytime sleepiness was measured using the Epworth Sleepiness Scale (ESS).Results
The patients were 84 females and 16 males (F:M 5.25:1) with mean age of 48.1 ± 12.4 years, disease duration of 6.9 ± 5.9 years, DAS28 was 4.3 ± 1.4, MHAQ was 0.95 ± 0.6 and VAS was 45.2 ± 21.1. The sleep scores PSQI, AIS and ESS were significantly increased in patients (6.98 ± 2.8, 9.6 ± 4.4 and 7.4 ± 2.6) compared to control (2.6 ± 1.9, 2.7 ± 1.8 and 3.3 ± 2.03 respectively; p = 0.01 each). Sleep scores tended to be lower in females and were significantly higher in those with positive C-reactive protein. Rheumatoid factor positive patients and those not receiving methotrexate had significantly higher PSQI and AIS scores. Sleep scores significantly correlated with age, erythrocyte sedimentation rate, DAS28, VAS, MHAQ and vdHSS and negatively with SF-36 physical component score (PCS) (p = 0.01 for all). Disease duration, DAS28, VAS and SF36 (PCS) were significant risk factors for sleep problems.Conclusion
A high frequency of sleep disturbances in RA patients was observed. Interplay of pain, fatigue, activity and disability may lead to poor sleep quality. 相似文献57.
58.
59.
Azrin N Abd Rahman Susan E Tett Halim A Abdul Gafor Brett C McWhinney Christine E Staatz 《British journal of clinical pharmacology》2015,80(5):1064-1075
Aims
The aim was to examine relationships between total and unbound mycophenolic acid (MPA) and prednisolone exposure and clinical outcomes in patients with lupus nephritis.Methods
Six blood samples were drawn pre- and at 1, 2, 4, 6 and 8 h post-dose and total and unbound MPA and prednisolone pre-dose (C0), maximum concentration (Cmax) and area under the concentration–time curve (AUC) were determined using non-compartmental analysis in 25 patients. The analyses evaluated drug exposures in relation to treatment response since starting MPA and drug-related adverse events.Results
Dose-normalized AUC varied 10-, 8-, 7- and 19-fold for total MPA, unbound MPA, total prednisolone and unbound prednisolone, respectively. Median values (95% CI) of total MPA AUC(0,8 h) (21.5 [15.0, 42.0] vs. 11.2 [4.8, 30.0] mg l–1 h, P= 0.048) and Cmax (11.9 [6.7, 26.3] vs. 6.1 [1.6, 9.2] mg l–1, P = 0.016) were significantly higher in responders than non-responders. Anaemia was significantly associated with higher total (37.8 [14.1, 77.5] vs. 18.5 [11.7, 32.7] mg l–1 h, P = 0.038) and unbound MPA AUC(0,12 h) (751 [214, 830] vs. 227 [151, 389] mg l–1 h, P = 0.004). Unbound prednisolone AUC(0,24 h) was significantly higher in patients with Cushingoid appearance (unbound: 1372 [1242, 1774] vs. 846 [528, 1049] nmol l–1 h, P = 0.019) than in those without. Poorer treatment response was observed in patients with lowest tertile exposure to both total MPA and prednisolone as compared with patients with middle and higher tertile exposure (17% vs. 74%, P = 0.023).Conclusions
This study suggests a potential role for therapeutic drug monitoring in individualizing immunosuppressant therapy in patients with lupus nephritis. 相似文献60.