全文获取类型
收费全文 | 572篇 |
免费 | 33篇 |
国内免费 | 66篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 44篇 |
妇产科学 | 5篇 |
基础医学 | 50篇 |
口腔科学 | 41篇 |
临床医学 | 62篇 |
内科学 | 89篇 |
皮肤病学 | 2篇 |
神经病学 | 39篇 |
特种医学 | 104篇 |
外科学 | 55篇 |
综合类 | 17篇 |
预防医学 | 48篇 |
眼科学 | 3篇 |
药学 | 85篇 |
中国医学 | 2篇 |
肿瘤学 | 23篇 |
出版年
2023年 | 4篇 |
2022年 | 6篇 |
2021年 | 4篇 |
2020年 | 6篇 |
2019年 | 6篇 |
2018年 | 7篇 |
2017年 | 7篇 |
2016年 | 6篇 |
2014年 | 6篇 |
2013年 | 11篇 |
2012年 | 12篇 |
2011年 | 14篇 |
2010年 | 10篇 |
2009年 | 15篇 |
2008年 | 24篇 |
2007年 | 46篇 |
2006年 | 21篇 |
2005年 | 11篇 |
2004年 | 6篇 |
2003年 | 12篇 |
2002年 | 18篇 |
2001年 | 17篇 |
2000年 | 19篇 |
1999年 | 11篇 |
1998年 | 27篇 |
1997年 | 28篇 |
1996年 | 26篇 |
1995年 | 22篇 |
1994年 | 19篇 |
1993年 | 11篇 |
1991年 | 6篇 |
1990年 | 19篇 |
1989年 | 21篇 |
1988年 | 23篇 |
1987年 | 18篇 |
1986年 | 12篇 |
1985年 | 20篇 |
1984年 | 9篇 |
1983年 | 10篇 |
1982年 | 8篇 |
1981年 | 9篇 |
1980年 | 5篇 |
1978年 | 14篇 |
1977年 | 9篇 |
1976年 | 6篇 |
1975年 | 10篇 |
1971年 | 3篇 |
1970年 | 4篇 |
1969年 | 4篇 |
1966年 | 9篇 |
排序方式: 共有671条查询结果,搜索用时 15 毫秒
41.
Riccardo?BallarioEmail author Paolo?Beltrami Stefano?Cavalleri Lorenzo?Ruggera Maria?Grazia?Zorzi Walter?Artibani 《BMC cancer》2004,4(1):95
Background
We describe a patient who underwent transurethral resection of the prostate for urinary obstructive symptoms and had histological findings of adenocarcinoma of the prostate with prostatic localization of chronic lymphocitic leukemia (CLL).The contemporary presence of CLL, adenocarcinoma of the prostate and residual prostatic gland after transurethral resection has never been reported before and the authors illustrate how they managed this unusual patient. 相似文献42.
LI Landau PD Phelan GL Gillam E Coombs HR Noblett 《Archives of disease in childhood》1977,52(4):282-286
Respiratory function studies were carried out in 22 infants who had successful repair of diaphragmatic herniae of the Bochdalek type. Thoracic gas volume was initially reduced in only 3 of these, but subsequent studies showed that improvement occurred. There were no consistent abnormalities in either dynamic compliance or mean pulmonary conductance. This is evidence that there is rapid adaptation which compensates for any alteration in the parenchymatous tissue in the lungs or abnormalities in the bronchial tree in infants soon after the repair of congenital diaphragmetic herniae. Further studies are necessary to determine the changes in these lungs with growth. 相似文献
43.
E Polatti P F Bolis M F Ravagni-Probizer A Baruffini A Cavalleri 《American journal of obstetrics and gynecology》1978,131(7):792-796
The results obtained with intermittent bromocryptine treatment from the fifth day after the beginning of menstruation until the second day after the basal temperature rise, in 14 women with hyperprolactinemic amenorrhea-galactorrhea and in whom menses had previously been induced by continuous treatment, are presented. All women had menses without reappearance of galactorrhea; serum FSH, LH, estradiol, and progesterone followed a normal physiologic trend. Only prolactin rose again in the second phase of the cycle, in which lower levels of progesterone were also found, but without any significant interference in the clinical and hormonal trend. It is stressed that administration of bromocryptine during the first part of the cycle might substitute for continuous administration, thereby reducing drug consumption and hence possible side-effects as well as the cost of treatment. 相似文献
44.
45.
AIMS: Long acting subcutaneous testosterone pellets are of proved efficacy for the treatment of hypogonadal men, but have not been reported as a treatment modality in adolescent boys. Pharmacodynamic studies of subcutaneous testosterone release have shown prolonged normalisation of testosterone levels for at least four months. Administration of a long acting, safe, effective, and convenient form of treatment is desirable when life-long treatment is indicated. PATIENTS AND METHODS: Eighteen boys (aged 13.9-17.5 years at the start of treatment)-seven with primary hypogonadism, nine with secondary hypogonadism, and two boys being treated with testosterone for tall stature--were given testosterone pellets (8-10 mg/kg) every six months for 18 months. Height, weight, pubertal status, and psychosocial parameters were assessed and follicle stimulating hormone, luteinising hormone, testosterone, prolactin, and lipids were measured at 0, 1, 3, 6, 12, and 18 months. Bone age was measured at 0 and 12 months. RESULTS: In all boys growth velocity continued appropriately for bone age. Puberty continued to progress in all boys and in two boys the amount of virilisation exceeded that seen with previous treatment with intramuscular testosterone. After testosterone administration, follicle stimulating hormone and luteinising hormone suppressed incompletely in the boys with primary hypogonadism. Serum testosterone ranged from 4.3 to 26.7 nmol/l at three months to less than 10 nmol/l at six months after implantation. Prolactin and lipid levels were normal throughout the study. By report, there was an improvement in mood and emotional wellbeing. No pellet extrusions occurred in a total of 156 pellet insertions. CONCLUSIONS: All boys preferred this mode of testosterone administration to intramuscular injections. Long acting subcutaneous testosterone pellets are safe, efficacious, well tolerated, and convenient, and result in normal physical growth and improved psychological outlook in adolescent hypogonadal boys. 相似文献
46.
47.
A Cavalleri F Gobba L Bacchella F Luberto A Ziccardi 《British journal of industrial medicine》1988,45(12):818-823
Serum type III procollagen peptide (PIIIP) concentrations were determined in 36 male workers exposed to asbestos fibres in the production of asbestos cement items and in 13 healthy male controls. Mean (SD) PIIIP serum concentrations were 9.3 (1.5) ng/ml (range 7-12) in the controls and 13.7 (3.5)ng/ml (range 7.5-20) in the asbestos workers; the difference was statistically significant (p less than 0.01). The exposed workers were subdivided according to presence or absence of radiological signs of asbestosis and intensity and duration of exposure. PIIIP serum values of workers with asbestos related interstitial fibrosis were the highest of the groups at 14.6 (2.3) ng/ml. In workers with heavy exposure the PIIIP values were significantly related to duration of exposure (r = 0.95; p less than 0.01). PIIIP serum values may be a useful index for the early diagnosis of asbestos induced pulmonary fibrosis and its use should be considered as part of the biological monitoring of exposed workers. 相似文献
48.
Occupational exposure to various neurotoxic chemicals can impair color vision. We evaluated this possibility in toluene-exposed workers. Thirty-three rubber workers and 16 referents were studied. We estimated toluene exposure by measuring urinary excretion of the unmodified form of the solvent (i.e., TolU). Color vision was tested with the Lanthony D-15 desaturated panel, and the outcomes were expressed quantitatively with the Color Confusion Index and the Total Confusion Index. Toluene-exposed workers had a subclinical reduction in color vision, compared with referents. We related this effect to solvent cumulative exposure--estimated as the product of urinary excretion of unmodified toluene by previous toluene exposure duration. This approach supports the hypothesis that impairment progresses as exposure continues. In the examined group of workers, toluene exposure was within the occupational limit proposed by the American Conference of Governmental Industrial Hygienists. The observed loss in color vision raises doubts on the real protection afforded by this limit--at least for effects of the solvent on the eyes. Finally, the Total Confusion Index was a more sensitive index than the Color Confusion Index in the evaluation of toluene-related color-vision impairment, suggesting that this index should be adopted in future studies of the effects of chemicals on color perception. 相似文献
49.
香菇多糖的免疫调节作用 总被引:26,自引:0,他引:26
研究香菇多糖(LTN)的免疫调节作用。结果表明,LTN1及5mg·kg-1·d-1×6,ip可促进正常小鼠由ConA(2.5mg·kg-1)刺激的脾脏T淋巴细胞增殖反应。1,5及10mg·kg-1·d-1×8或5,ip能分别纠正由环磷酰胺(Cy,200mg·kg-1和80mg·kg-1,ip)诱导的免疫亢进或低下状态。此外,LTN(1,5和10mg·kg-1·d-1×6,ip),促使小鼠胸腺L3T4+(Th)和Lyt2+(Ts)细胞数减少,外周脾脏L3T4+和Lyt2+细胞数增加,腹腔巨噬细胞释出肿瘤坏死因子(TNF)也明显增加。这些作用均以LTN5mg·kg-1·d-1作用最佳。提示LTN可能通过影响T细胞及其亚型,促进TNF活性调节机体的免疫功能。 相似文献
50.
常咯啉在实验性心律失常狗的药代动力学-药效动力学分析 总被引:1,自引:0,他引:1
用Harris冠脉结扎法诱发的心律失常狗研究常咯啉药代动力学-药效动力学。7只狗按83.33μg·kg ̄(-1)·min ̄(-1)静脉滴注60min,在给药期间和停药后不同时间记录ECG及测定血药浓度。C-T数据用药代程序计算药代参数;药效数据用药代-药效同步分析模型计算药效动力学参数,K10,T1/2,Vd,Cl分别为0.0087min ̄(-1),78.03min,40.55ml·kg ̄(-1)和0.421ml·kg ̄(-1)·min ̄(-1);Ke0和Ce(50)分别为0.0048min ̄(-1)和2.01μg·ml ̄(-1). 相似文献