全文获取类型
收费全文 | 25797篇 |
免费 | 2001篇 |
国内免费 | 101篇 |
专业分类
耳鼻咽喉 | 217篇 |
儿科学 | 588篇 |
妇产科学 | 401篇 |
基础医学 | 3554篇 |
口腔科学 | 329篇 |
临床医学 | 2781篇 |
内科学 | 5823篇 |
皮肤病学 | 312篇 |
神经病学 | 2323篇 |
特种医学 | 836篇 |
外科学 | 4265篇 |
综合类 | 279篇 |
现状与发展 | 1篇 |
一般理论 | 25篇 |
预防医学 | 1895篇 |
眼科学 | 405篇 |
药学 | 1803篇 |
中国医学 | 44篇 |
肿瘤学 | 2018篇 |
出版年
2023年 | 258篇 |
2022年 | 453篇 |
2021年 | 1001篇 |
2020年 | 515篇 |
2019年 | 812篇 |
2018年 | 927篇 |
2017年 | 650篇 |
2016年 | 670篇 |
2015年 | 760篇 |
2014年 | 1044篇 |
2013年 | 1315篇 |
2012年 | 2068篇 |
2011年 | 2095篇 |
2010年 | 1121篇 |
2009年 | 974篇 |
2008年 | 1620篇 |
2007年 | 1607篇 |
2006年 | 1467篇 |
2005年 | 1414篇 |
2004年 | 1348篇 |
2003年 | 1251篇 |
2002年 | 1232篇 |
2001年 | 185篇 |
2000年 | 143篇 |
1999年 | 216篇 |
1998年 | 250篇 |
1997年 | 202篇 |
1996年 | 162篇 |
1995年 | 160篇 |
1994年 | 163篇 |
1993年 | 128篇 |
1992年 | 112篇 |
1991年 | 77篇 |
1990年 | 101篇 |
1989年 | 72篇 |
1988年 | 74篇 |
1987年 | 96篇 |
1986年 | 81篇 |
1985年 | 66篇 |
1984年 | 97篇 |
1983年 | 82篇 |
1982年 | 90篇 |
1981年 | 81篇 |
1980年 | 84篇 |
1979年 | 54篇 |
1978年 | 59篇 |
1977年 | 45篇 |
1975年 | 36篇 |
1974年 | 34篇 |
1973年 | 35篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
LIMITATIONS OF RADIOTHERAPY IN THE DEFINITIVE TREATMENT OF SQUAMOUS CARCINOMA OF THE TONSILLAR FOSSA
Christopher J. O'Brien Geeta K. Castle Graham N. Stevens G. Mac Halliday John K. Donovan Kenneth K. Lee Nicholas A. Packham Maurice J. Peat 《ANZ journal of surgery》1992,62(9):709-713
Between 1970 and 1990, 104 patients with squamous cell carcinoma (SCC) of the tonsil were treated. The median age was 58 years and 80% of patients were males. Distribution among clinical stages was: stage I, 19 patients; stage II, 12 patients; stage III, 23 patients; and stage IV, 48 patients. More than 70% of patients had initial radiotherapy as definitive treatment irrespective of stage, reflecting the treatment philosophy over much of this period. The overall survival rate was 26% at 5 years, with survival being significantly affected by T stage, clinical stage and age. Clinical node status did not significantly affect survival rates. Good local control of T1N0 cancers was achieved with radiotherapy alone, but patients with more advanced cancers did poorly. We have now moved away from a non-selective policy and use initial surgery combined with postoperative radiotherapy in most patients, reserving radiotherapy alone for mainly early tonsil cancers. 相似文献
102.
IL-12 and IL-23: master regulators of innate and adaptive immunity 总被引:27,自引:0,他引:27
Claire L. Langrish Brent S. McKenzie Nicholas J. Wilson Rene de Waal Malefyt Robert A. Kastelein Daniel J. Cua † 《Immunological reviews》2004,202(1):96-105
Summary: Initiation of an effective immune response requires close interactions between innate and adaptive immunity. Recent advances in the field of cytokine biology have led to an increased understanding of how myeloid cell‐derived factors regulate the immune system to protect the host from infections and prevent tumor development. In this review, we focus on the function of interleukin (IL)‐23, a new member of the IL‐12 family of regulatory cytokines produced by activated macrophages and dendritic cells. We propose that IL‐12 and IL‐23 promote two distinct immunological pathways that have separate but complementary functions. IL‐12 is required for antimicrobial responses to intracellular pathogens, whereas IL‐23 is likely to be important for the recruitment and activation of a range of inflammatory cells that is required for the induction of chronic inflammation and granuloma formation. These two cytokines work in concert to regulate cellular immune responses critical for host defense and tumor suppression. 相似文献
103.
Harry Pantazopoulos Nicholas Lange Ross J Baldessarini Sabina Berretta 《Neuropsychopharmacology》2007,61(5):640-652
BACKGROUND: Growing evidence indicates that the entorhinal cortex (ECx) might be affected in schizophrenia (SZ) and bipolar disorder (BD). To test whether distinct interneuronal subpopulations might be altered, numbers of parvalbumin-immunoreactive (PVB-IR) neurons were measured in the ECx of BD and SZ subjects. These neurons play a pivotal role within ECx intrinsic circuits. METHODS: Numbers, numerical density, and soma size of PVB-IR neurons were measured in the ECx of normal control (n = 16), BD (n = 10), and SZ (n = 10) subjects. The volume of the ECx was measured in Nissl-stained sections. RESULTS: In BD, decreases of total numbers (p = .02) and numerical densities (p = .01) of PVB-IR neurons were detected in the ECx. Within distinct subregions, reductions were detected in the superficial layers of the lateral (p = .02), intermediate (p = .04), and caudal (p = .01) ECx. In SZ, total numbers and numerical densities were not altered. A reduction of soma size was present in the intermediate ECx (p = .01). Volume was unaffected in either disorder. CONCLUSIONS: In BD, a decrease of PVB-IR neurons may alter intrinsic inhibitory networks within the superficial layers of the ECx. The likely consequence is a disruption of integration and transfer of information from the cerebral cortex to the hippocampus. 相似文献
104.
105.
106.
Nicholas Stephens Eric Marques Christopher Livingston 《CANADIAN JOURNAL OF PLASTIC SURGERY》2007,15(1):44-46
Anomalies of the flexor digitorum superficialis muscle are extremely uncommon and usually present as a painful mass or pseudotumour within the palm. Diagnosis may be difficult because many other soft tissue tumours (lipomas, ganglions, giant cell tumours and hamartomas) may present similarly. Magnetic resonance imaging helps to define the extent and characteristics of this anomalous muscle belly and to distinguish it from a soft tissue sarcoma, whereas plain radiographs are of little value. Three types of flexor digitorum superficialis muscle anomalies have been described, and treatment consists of subtotal or total surgical debulking of the mass if symptoms persist or if the diagnosis is in question. Most patients have complete resolution and full recovery. To date, 20 cases have been reported in the literature, usually involving the right small finger. In the present paper, the case of an anomalous flexor digitorum superficialis muscle in a 17-year-old male patient’s left index finger is reported. Symptoms were relieved following surgical debulking and hand-based occupational therapy. 相似文献
107.
Edward J. Ciaccio PhD Hiroshi Ashikaga MD PhD Riyaz A. Kaba MD Daniel Cervantes MD Bruce Hopenfeld PhD Andrew L. Wit PhD Nicholas S. Peters MD PhD Elliot R. McVeigh PhD Hasan Garan MD James Coromilas MD 《Heart rhythm》2007,4(8):1034-1045
BACKGROUND: Infarct border zone (IBZ) geometry likely affects inducibility and characteristics of postinfarction reentrant ventricular tachycardia, but the connection has not been established. OBJECTIVE: The purpose of this study was to determine characteristics of postinfarction ventricular tachycardia in the IBZ. METHODS: A geometric model describing the relationship between IBZ geometry and wavefront propagation in reentrant circuits was developed. Based on the formulation, slow conduction and block were expected to coincide with areas where IBZ thickness (T) is minimal and the local spatial gradient in thickness (DeltaT) is maximal, so that the degree of wavefront curvature rho proportional, variant DeltaT/T is maximal. Regions of fastest conduction velocity were predicted to coincide with areas of minimum DeltaT. In seven arrhythmogenic postinfarction canine heart experiments, tachycardia was induced by programmed stimulation, and activation maps were constructed from multichannel recordings. IBZ thickness was measured in excised hearts from histologic analysis or magnetic resonance imaging. Reentrant circuit properties were predicted from IBZ geometry and compared with ventricular activation maps after tachycardia induction. RESULTS: Mean IBZ thickness was 231 +/- 140 microm at the reentry isthmus and 1440 +/- 770 microm in the outer pathway (P <0.001). Mean curvature rho was 1.63 +/- 0.45 mm(-1) at functional block line locations, 0.71 +/- 0.18 mm(-1) at isthmus entrance-exit points, and 0.33 +/- 0.13 mm(-1) in the outer reentrant circuit pathway. The mean conduction velocity about the circuit during reentrant tachycardia was 0.32 +/- 0.04 mm/ms at entrance-exit points, 0.42 +/- 0.13 mm/ms for the entire outer pathway, and 0.64 +/- 0.16 mm/ms at outer pathway regions with minimum DeltaT. Model sensitivity and specificity to detect isthmus location was 75.0% and 97.2%. CONCLUSIONS: Reentrant circuit features as determined by activation mapping can be predicted on the basis of IBZ geometrical relationships. 相似文献
108.
109.
Cognitive Behavior Therapy for Psychotic Disorders: Current Issues and Future Developments 总被引:2,自引:0,他引:2
Nicholas Tarrier 《Clinical psychology》2005,12(1):51-56
There is accumulating evidence, reviewed by Caudiano (this issue), that cognitive behavior therapy (CBT) is an effective adjunct treatment for schizophrenia. Schizophrenia treatment and research provides a range of challenges that are probably not present in other mental health problems. These include contextual issues, clinical issues, scientific and methodological issues, practical and pragmatic issues, public concern, and human rights issues. This paper discusses these issues with emphasis on the clinical and research challenges for the future. 相似文献
110.