全文获取类型
收费全文 | 20045篇 |
免费 | 1032篇 |
国内免费 | 102篇 |
专业分类
耳鼻咽喉 | 234篇 |
儿科学 | 458篇 |
妇产科学 | 310篇 |
基础医学 | 2481篇 |
口腔科学 | 587篇 |
临床医学 | 1420篇 |
内科学 | 5495篇 |
皮肤病学 | 406篇 |
神经病学 | 1657篇 |
特种医学 | 373篇 |
外科学 | 3089篇 |
综合类 | 129篇 |
一般理论 | 6篇 |
预防医学 | 1603篇 |
眼科学 | 510篇 |
药学 | 1094篇 |
1篇 | |
中国医学 | 56篇 |
肿瘤学 | 1270篇 |
出版年
2024年 | 14篇 |
2023年 | 150篇 |
2022年 | 400篇 |
2021年 | 741篇 |
2020年 | 342篇 |
2019年 | 639篇 |
2018年 | 772篇 |
2017年 | 422篇 |
2016年 | 467篇 |
2015年 | 575篇 |
2014年 | 744篇 |
2013年 | 963篇 |
2012年 | 1590篇 |
2011年 | 1688篇 |
2010年 | 909篇 |
2009年 | 867篇 |
2008年 | 1365篇 |
2007年 | 1344篇 |
2006年 | 1287篇 |
2005年 | 1212篇 |
2004年 | 1056篇 |
2003年 | 931篇 |
2002年 | 817篇 |
2001年 | 199篇 |
2000年 | 180篇 |
1999年 | 190篇 |
1998年 | 157篇 |
1997年 | 137篇 |
1996年 | 105篇 |
1995年 | 83篇 |
1994年 | 85篇 |
1993年 | 64篇 |
1992年 | 87篇 |
1991年 | 87篇 |
1990年 | 64篇 |
1989年 | 35篇 |
1988年 | 35篇 |
1987年 | 39篇 |
1986年 | 37篇 |
1985年 | 30篇 |
1984年 | 31篇 |
1983年 | 21篇 |
1982年 | 35篇 |
1981年 | 27篇 |
1980年 | 17篇 |
1978年 | 10篇 |
1977年 | 11篇 |
1975年 | 9篇 |
1974年 | 24篇 |
1973年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
Pedro Antonio Martínez-Carpio Miguel Ángel Navarro Moreno 《Clinical & translational oncology》2003,5(4):184-191
Resumen La técnica del cultivo celular es la que ha permitido conocer el comportamientoin vitro de las células cancerosas. En esta revisión pretendemos introducir las peculiaridades básicas del cultivo celular, referido
especialmente a líneas cancerosas mamarias, relacionar el origen de las líneas celulares más utilizadas en la investigación
de este cáncer, mencionar las técnicas de laboratorio que pueden aplicarse sobre estos cultivos y ejemplificar la utilidad
de las mismas, tomando como modelo diversos trabajos que estudian los efectos del factor de crecimiento epidérmico sobre líneas
celulares hormonoindependientes de cáncer de mama.
相似文献
62.
Miguel Marcos Alex Soriano José A Martínez Josep Mensa 《Clinical infectious diseases》2007,45(10):1401; author reply 1401-1401; author reply 1402
63.
64.
65.
Although tricyclic antidepressant are especially useful in the treatment of chronic pain conditions, most of the work about its mechanism of action has been made on acute pain tests. The present study was aimed at studying the role played by noradrenergic and opioidergic influences on the antinociceptive activity of subchronically administered clomipramine in the formalin test (a tonic pain model) in rats. Clomipramine produced antinociception after 7 days, administration (2.5 mg/kg/day), an effect equivalent to that obtained by acute morphine (5 mg/kg). The antinociceptive effect of clomipramine was inhibited by the following: nonspecific blocking of alpha1-and alpha2-adrenoceptors by phentolamine, specific blocking of alpha1-adrenoceptors by prazosin; stimulation of alpha2 receptors by clonidine; and blocking of the opioid receptors by naloxone. Blocking the alpha2-receptors with yohimbine did not antagonize the effect of clomipramine. These results suggest that clomipramine produces antinociception in this test, partly via the participation of the endogenous opioid system and partly by further activating or potentiating previously activated noradrenergic pathways which are involved in the control of pain information. 相似文献
66.
Integration of bilateral whisker stimuli in rats: role of the whisker barrel cortices. 总被引:6,自引:1,他引:5
Marshall G Shuler David J Krupa Miguel A L Nicolelis 《Cerebral cortex (New York, N.Y. : 1991)》2002,12(1):86-97
Recently, we demonstrated that neural responses within the whisker region of the primary somatosensory cortex (SIw) of rats are profoundly influenced by the spatiotemporal attributes of ipsilateral, as well as contralateral, whisker stimuli. As inactivation of one SIw eliminates in the intact SIw both ipsilaterally evoked responses and the influence of ipsilateral stimulation on contralaterally evoked activity, we proposed that interhemispheric interactions between the SIws may be important for integrating bilateral whisker information. To test whether rats can recognize the bilateral nature of a whisker stimulus, we developed a tactile discrimination task that required rats to conjointly determine distances to a left and a right discriminandum as equidistant or non-equidistant using only their facial whiskers. All rats trained in this task achieved performance levels indicative of an ability to integrate bilateral whisker information. Testing during unilateral, as well as bilateral, inactivation of the SIws indicated that rats rely on both SIws for detecting the bilateral nature of a whisker stimulus. Rats were unable to perform the task without both sets of whiskers, a fact that indicates that the whiskers (and not other modalities) were used to perform this task. The findings presented here indicate that rats can solve a task that requires the conjoint detection of left and right whisker-mediated distance information and implicate the SIws as central to this ability. 相似文献
67.
68.
Ossifying fibromyxoid tumor of soft parts 总被引:1,自引:0,他引:1
A. Manuel Velasco-Pastor J. Martinez-Escribano M. del Pino Gil-Mateo E. Quecedo-Estébanez J. Miguel Fortea-Baixauli A. Aliaga-Boniche 《Journal of cutaneous pathology》1996,23(4):381-384
Ossifying fibromyxoid tumors (OFT) of soft parts are very rare neoplasms recently described by Enzinger et al. (1). They usually present as well-circumscribed, slow-growing, asymptomatic subcutaneous masses. A characteristic finding is a fibrous capsule and an incomplete peripheral shell of mature bone. Although most cases behave as benign tumors, a high rate of local recurrences have been described. We describe a 43-year-old male with a perianal subcutaneous tumor of 10 years evolution. The histopathology was compatible with OFT. Due to the subcutaneous location of OFF, both the dermatologist and dermatopathologist need to know about this rare tumor. 相似文献
69.
Wijkstrom-Frei C El-Chemaly S Ali-Rachedi R Gerson C Cobas MA Forteza R Salathe M Conner GE 《American journal of respiratory cell and molecular biology》2003,29(2):206-212
The lactoperoxidase (LPO) antibiotic system is a well-characterized component of mammary and salivary gland secretions. Because LPO has been shown to function in ovine airways, human airway tissue and secretions were examined for the presence of LPO and its substrate, the anion thiocyanate (SCN-). In addition, human airway secretions were tested for LPO-mediated antibacterial activity, and LPO's activity was assessed against some human airway pathogens. The data showed that normal human airway secretions contained LPO enzyme activity (0.65 +/- 0.09 microg/mg secreted protein; n = 17), and Western blots of secretions demonstrated bands of the expected sizes for LPO. LPO mRNA was detected in trachea by sequencing PCR-amplified cDNA. SCN-, LPO's substrate, was present in undiluted airway secretions at concentrations sufficient for LPO catalysis (0.46 +/- 0.19 mM; n = 8), and diluted secretions contained antibacterial activity with LPO-like properties. Immunocytochemistry localized LPO to submucosal glands in human bronchi. Finally, as expected based on the known antibacterial spectrum of the LPO system, airway secretions showed LPO-dependent activity against Pseudomonas aeruginosa. In addition, the airway LPO system was shown to be effective against Burkholderia cepacia and Haemophilus influenzae. Thus, a functional LPO system exists in human airways and may contribute to airway host defense against infection. 相似文献
70.
Casanelles Mdel C Gil-Fernández JJ Casero LF Bengoechea MG Serrano R Rañada JM Jurado LA 《American journal of medical genetics. Part A》2003,(4):372-376
Williams or Williams-Beuren syndrome (WBS) is a developmental disorder with multisystemic manifestations characterized by distinctive facial features, mental disability with unique cognitive and personality profiles, vascular stenoses, growth retardation, and occasional infantile hypercalcemia, caused by haploinsufficiency for genes deleted in chromosome band 7q11.23. However, with the exception of arterial stenoses caused by haploinsufficiency for the elastin gene (ELN), no specific implication of any other gene in the phenotype has been established. We present two patients with portal hypertension leading to splenomegaly and pancytopenia carrying the common 1.5 Mb WBS deletion. We propose this is an additional severe vascular complication of ELN deficiency and discuss the specific characteristics of the portal venous tract that could explain the impact of ELN deficiency in that venous territory. This complication is potentially lethal and should thus be considered in any patient with WBS and splenomegaly. 相似文献