全文获取类型
收费全文 | 3187509篇 |
免费 | 253214篇 |
国内免费 | 5463篇 |
专业分类
耳鼻咽喉 | 45467篇 |
儿科学 | 100281篇 |
妇产科学 | 86377篇 |
基础医学 | 458075篇 |
口腔科学 | 91961篇 |
临床医学 | 295264篇 |
内科学 | 617189篇 |
皮肤病学 | 66089篇 |
神经病学 | 265524篇 |
特种医学 | 124753篇 |
外国民族医学 | 1104篇 |
外科学 | 471720篇 |
综合类 | 73746篇 |
现状与发展 | 4篇 |
一般理论 | 1435篇 |
预防医学 | 262190篇 |
眼科学 | 75209篇 |
药学 | 237666篇 |
10篇 | |
中国医学 | 5753篇 |
肿瘤学 | 166369篇 |
出版年
2018年 | 32992篇 |
2017年 | 25394篇 |
2016年 | 27970篇 |
2015年 | 31817篇 |
2014年 | 45326篇 |
2013年 | 69210篇 |
2012年 | 93460篇 |
2011年 | 99142篇 |
2010年 | 58142篇 |
2009年 | 55749篇 |
2008年 | 94053篇 |
2007年 | 100325篇 |
2006年 | 100687篇 |
2005年 | 98297篇 |
2004年 | 94530篇 |
2003年 | 91133篇 |
2002年 | 89637篇 |
2001年 | 142980篇 |
2000年 | 147535篇 |
1999年 | 124963篇 |
1998年 | 36542篇 |
1997年 | 33114篇 |
1996年 | 33157篇 |
1995年 | 31718篇 |
1994年 | 29827篇 |
1993年 | 27898篇 |
1992年 | 100965篇 |
1991年 | 98165篇 |
1990年 | 94926篇 |
1989年 | 91573篇 |
1988年 | 85180篇 |
1987年 | 83712篇 |
1986年 | 79590篇 |
1985年 | 75891篇 |
1984年 | 57674篇 |
1983年 | 49804篇 |
1982年 | 30151篇 |
1981年 | 26989篇 |
1979年 | 54638篇 |
1978年 | 38975篇 |
1977年 | 32800篇 |
1976年 | 30699篇 |
1975年 | 32653篇 |
1974年 | 40085篇 |
1973年 | 38541篇 |
1972年 | 36349篇 |
1971年 | 33715篇 |
1970年 | 31718篇 |
1969年 | 29666篇 |
1968年 | 27224篇 |
排序方式: 共有10000条查询结果,搜索用时 640 毫秒
971.
Â. C. Volpini M. J. Marques S. Lopes dos Santos G. L. Machado-Coelho W. Mayrink A. J. Romanha 《Clinical microbiology and infection》2006,12(8):815-818
This study examined the ability of PCR to amplify Leishmania DNA, stored on Giemsa-stained slides, from American cutaneous leishmaniasis (ACL) patients. In total, 475 slides stored for up to 36 years were obtained from an outpatient clinic in a Brazilian ACL-endemic region, and Leishmania DNA was amplified from 395 (83.2%) of the DNA samples using primers specific for the minicircle kinetoplast DNA. Restriction fragment length polymorphism analysis of these amplicons demonstrated that Leishmania (Viannia) braziliensis was the only species present in these samples. The results demonstrated that archived Giemsa-stained slides can provide a Leishmania DNA source for performing clinical and epidemiological studies of leishmaniasis. 相似文献
972.
S. V. Terent’eva E. N. Komarova T. N. Sapozhnikova A. T. Teplyakov E. A. Ivanovskaya T. I. Andreeva 《Pharmaceutical Chemistry Journal》2006,40(12):694-696
A rapid procedure for determining angiotensin II in the blood by inverse voltammetry using a TA-2 device (Tekhnoanalit Company,
Tomsk) with a graphite electrode has been developed. The results of analyses using the proposed technique agree with the clinical
data. The rapid analytical procedure favors optimization of cardiotropic drug therapy.
__________
Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 40, No. 12, pp. 54–56, December, 2006. 相似文献
973.
974.
Decreases in sex hormone levels with menopause may bring about a number of consequences in women's general health and sexual well-being, especially when levels decline suddenly and prematurely, as in surgical menopause. In addition to the well-established role of estrogens in preserving the biological basis of sexual response, there is emerging evidence that androgens are significant independent determinants affecting sexual desire, activity and satisfaction, as well as mood, energy and other components of women's health. Hypoactive sexual desire disorder (HSDD), a persistent absence of sexual fantasies or thoughts and/or desire for and receptivity to sexual activity that causes personal distress, is experienced by some postmenopausal women. Even though conventional hormone therapy with estrogens or estrogens and progestogens may be effective for vaginal atrophy, increasing vaginal lubrication and reducing dyspareunia, it has not been shown to consistently increase sexual desire or activity and many women with sexual dysfunction remain unresponsive. Several recent, large, phase III studies have shown that the addition of transdermal testosterone to conventional hormone therapy can be helpful in surgically menopausal women presenting with HSDD. After 24 weeks of treatment in these studies, testosterone-treated women experienced significantly greater increases in satisfying sexual activity and sexual desire, and greater decreases in distress, than placebo-treated women. Accurate clinical assessment and individualized management of sexual symptoms are fundamentally important for all menopausal women with HSDD or other sexual problems. 相似文献
975.
Adriana B Campaner Alessandro Scapinelli Ruy O Machado Roberto E Dos Santos Geni W Beznos Tsutomu Aoki 《Gynecological endocrinology》2006,22(7):395-398
We report a case of a prepubertal girl with juvenile primary hypothyroidism presenting as ovarian cysts and precocious puberty. The 7-year-old female was referred to our clinic because of a pelvic/abdominal mass and vaginal bleeding. Besides these findings, on physical examination we noticed the thyroid gland globally increased and the presence of secondary sexual characteristics. Based upon the clinical profile and investigations, the patient was diagnosed with juvenile primary hypothyroidism due to autoimmune thyroiditis. The cysts and precocious puberty resolved spontaneously after the simple replacement of thyroid hormone. It is important to bear in mind hypothyroidism in cases of girls presenting ovarian cysts and precocious puberty in order to avoid unnecessary surgery on the ovaries. 相似文献
976.
Henk R Franke F Froukje Snaaijer Paul W H Houben Marius J van der Mooren 《Gynecological endocrinology》2006,22(12):692-697
OBJECTIVE: To assess the effects of adding combined estradiol/norethisterone acetate therapy (CENT) to goserelin acetate treatment (GA) of dysfunctional uterine bleeding (DUB) in perimenopausal women. METHODS: In a randomized, placebo-controlled, double-blind trial followed by an open follow-up study, 31 perimenopausal women with DUB were recruited from gynecological outpatient departments of two Dutch hospitals and randomized for treatment with either GA/placebo or GA/CENT for 6 months followed by 18 months of GA/CENT for all. The main outcome measures were abdominal pain, number of bleeding days, double-layer endometrial thickness (DET), Greene climacteric score (GCS), visual analog scale for well-being, bone mineral density (BMD) and mammographic density (BI-RAD score). RESULTS: Abdominal pain, number of bleeding days and DET decreased in both groups, the between-group difference in decrease not being statistically significant. GCS initially showed significant improvement in the GA/CENT group. BMD decreased significantly in the GA/placebo group (-4.1%) compared with the GA/CENT group (-0.3%). Another 18 months of GA/CENT did not result in a lasting difference in BMD between groups. BI-RAD scores did not differ significantly between or within the two groups. CONCLUSIONS: Adding CENT to GA treatment for DUB in perimenopausal women initially prevented BMD loss and improved climacteric complaints, while having no negative impact on vaginal bleeding, abdominal pain or BI-RAD scores. However, prolonged treatment did not result in a lasting prevention of bone loss. 相似文献
977.
Symptomatic osteoradionecrosis of pelvic bones in patients with gynecological malignancies—result of a long-term follow-up 总被引:1,自引:0,他引:1
D. FELTL M. VOMIK† M. JIRÁSEK‡ V. STÁHALOVÁ† & J. KUBE† 《International journal of gynecological cancer》2006,16(2):478-483
The aim of this study was to assess the incidence and risk factors of pelvic fractures as a result of radiation therapy in women with gynecological cancer. We retrospectively reviewed 3530 female patients treated at our institute between 1980 and 1998 with megavoltage radiation with or without brachytherapy for cancer in the pelvic area. Eligible were patients with vulvar, vaginal, cervical, endometrial, and fallopian tube cancer. Median follow-up was 88 months (range 0-240). Emphasis was put on treatment-related and patient-related risk factors. Of the eligible 3155 patients, 15 developed symptomatic bone fracture caused by osteoradionecrosis, which makes an overall incidence of 0.44% The diagnosis was based on anamnesis, clinical course, and X-ray or computed tomography images. Median time of onset was 44 months (range 6-197). All patients had pain as the first symptom. The only independent predictive factor for developing osteoradionecrosis seemed to be preexistent osteoporosis. Other risk factors that are related to osteoporosis include higher age, postmenopausal status, or steroid treatment. We did not find any significant treatment-related predictive factor for pelvic osteoradionecrosis. Patients with osteoporosis are probably at the highest risk for developing osteoradionecrotic fractures after pelvic radiotherapy. More studies are needed to find out other endogenous predictive factors. 相似文献
978.
X chromosomal and autosomal loss of heterozygosity and microsatellite instability in human cervical carcinoma 总被引:1,自引:0,他引:1
J. EDELMANN K. RICHTER C. HÄNEL† S. HERING‡ & L.-C. HORN† 《International journal of gynecological cancer》2006,16(3):1248-1253
The study analyzes tumor material and normal tissue from 27 patients with pure squamous cell carcinoma of the uterine cervix for loss of heterozygosity (LOH) and microsatellite instability (MSI) on 14 autosomal and 11 X chromosomal loci. Overall, 4-40% of the informative cases showed LOH at autosomal regions with the highest frequency at 3p (21-40%) and a marked frequency at 2q35-q37.1 (12.5%) and 17p13.3 (10%), representing regions with putative tumor suppressor gene (TSG) function. The frequency of X chromosomal LOH ranged from 4% to 20%, with a maximum at Xq28 (20%) and Xq11.2-q12 (17%), again indicating alterations in TSG. A 12% LOH was seen at Xq21.33-q22.3, a region encoding a protein with a regulatory function in the cell cycle via cyclin-dependent kinases. MSI was detected in autosomal regions in up to 7% in regions linked to the X chromosome in up to 11%, probably indicating alterations of mismatch repair mechanisms. Our results and those obtained from the literature suggest that autosomal LOH and MSI in carcinomas of the cervix uteri are predominantly found at regions with putative TSG function. Beside TSG alterations, X chromosomal LOH is probably more strongly connected to disturbances in cell cycle regulation. 相似文献
979.
980.
In a retrospective study using univariate analysis, we identified tumor type (nonendometrioid vs endometrioid), depth of myoinvasion (MI), mode of MI (infiltrative vs cohesive), and direct anatomic invasion of the cervical wall from the isthmus as significant positive risk factors for intramyometrial lymphvascular space involvement (LVSI). On multivariate analysis, tumor grade, depth of MI, and mode of MI retained their significance. We created a grid for the relative risks of LVSI with respect to these variables individually or in combination. We suggest that our indirect estimate of the risk of LVSI can help in assessing prognosis and determining the need for adjuvant therapy whenever LVSI is important in clinical decision making, but its pathologic diagnosis is uncertain. 相似文献