全文获取类型
收费全文 | 1562篇 |
免费 | 102篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 35篇 |
儿科学 | 46篇 |
妇产科学 | 112篇 |
基础医学 | 178篇 |
口腔科学 | 28篇 |
临床医学 | 158篇 |
内科学 | 336篇 |
皮肤病学 | 8篇 |
神经病学 | 205篇 |
特种医学 | 42篇 |
外科学 | 246篇 |
综合类 | 6篇 |
一般理论 | 1篇 |
预防医学 | 82篇 |
眼科学 | 35篇 |
药学 | 74篇 |
中国医学 | 1篇 |
肿瘤学 | 81篇 |
出版年
2024年 | 1篇 |
2023年 | 7篇 |
2022年 | 22篇 |
2021年 | 40篇 |
2020年 | 24篇 |
2019年 | 32篇 |
2018年 | 48篇 |
2017年 | 49篇 |
2016年 | 46篇 |
2015年 | 37篇 |
2014年 | 50篇 |
2013年 | 88篇 |
2012年 | 94篇 |
2011年 | 124篇 |
2010年 | 72篇 |
2009年 | 71篇 |
2008年 | 98篇 |
2007年 | 118篇 |
2006年 | 97篇 |
2005年 | 79篇 |
2004年 | 101篇 |
2003年 | 116篇 |
2002年 | 110篇 |
2001年 | 19篇 |
2000年 | 7篇 |
1999年 | 22篇 |
1998年 | 15篇 |
1997年 | 11篇 |
1996年 | 9篇 |
1995年 | 8篇 |
1994年 | 6篇 |
1993年 | 11篇 |
1992年 | 9篇 |
1991年 | 7篇 |
1990年 | 3篇 |
1988年 | 2篇 |
1987年 | 5篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
排序方式: 共有1674条查询结果,搜索用时 15 毫秒
1.
2.
Menahem Neuman Boris Friedman Avi Stein A. Ami Sidi Alexander Tsivian 《Gynecological surgery》2007,4(3):175-178
The objective of the study was to compare the clinical outcomes at the short-term follow-ups of two novel transobturator mid-urethral
sling procedures – the transobturator tape (TOT) procedure and the tension-free vaginal tape (TVT)-obturator procedure. The
study cohort consisted two groups of 40 women with urodynamically proven stress urinary incontinence (SUI). The patients in
one group underwent the TOT procedure, performed according to Delorme (Prog Urol 11:1306–1313, 2001); those in the second
group underwent the TVT-obturator operation, performed according to de Leval (Eur Urol 44:724–730, 2003). Intra-operative
diagnostic cystoscopy was not performed with either the TVT-obturator or the TOT procedures. The average follow-up was 12 months.
The two patient groups were similar in terms of demographic and therapeutic criteria, except for patient age, which was significantly
younger in the TVT-obturator group. Previously reported TVT-related operative complications, such as bladder penetration,
intra-operative bleeding, field infection and post-operative pelvic floor relaxation, were not observed in patients of either
group. Bowel and urethral injuries were also not recorded. The therapeutic failure rates were 10% for the TOT procedure and
5% for the TVT-obturator procedure. Urinary frequency and urgency post-operatively were reported in 25% of the TOT patients
and 19% of the TVT-obturator patients, pelvic or vaginal pain affected 10% of the TOT and 5% of the TVT-obturator patients,
while post-operative voiding difficulty was experienced by 12.5% of the TOT and 7.5% of the TVT-obturator patients. None of
the above-mentioned differences between the two patient groups were of statistical significance. The TVT-obturator and TOT
procedures, both minimally invasive, novel, mid-urethral sling procedures, seem to be safe, easy-to-perform and effective
in treating female SUI. The patients of both study groups suffered less intra- and post-operative surgical complications than
previously been reported in connection with the TVT operation. The TVT-obturator patients had fewer therapeutic failures,
less post-operative urinary frequency and urgency, less pelvic pain and less voiding difficulty. All of these findings, however,
had no statistical significance; consequently, long-term comparative data collection will be required before solid conclusions
can be drawn on the superiority of either of these two operative techniques. 相似文献
3.
Zahava Sololmon Shimon E. Spiro Arik Shalev Avi Bleich Samuel Cooper 《Journal of traumatic stress》1992,5(2):217-223
Nine months after the residential stage of Koach, participants were asked to evaluate the program's effectiveness. Most of the veterans reported improvement in the areas queried, and especially in social relations, and nearly all of them stated that they would recommend the program to other veterans. The commander-therapists became the major source of help for these veterans following the Koach project, and about half reported that they participated regularly in self-help groups. Most of the participants acquired coping techniques that continued to serve them 9 months after the end of the residential stage of Koach. One of the more important measures of Koach was thought to be the veterans' own evaluations of the project, their assessment of the project's success in achieving its aims, and their satisfaction with it. In this article we will present the subjects' evaluations of treatment effectiveness as expressed in behavioral and emotional changes that they attributed to the treatment. 相似文献
4.
Dual activity maps in primate visual cortex produced by different temporal patterns of zif268 mRNA and protein expression
下载免费PDF全文
![点击此处可从《Proceedings of the National Academy of Sciences of the United States of America》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Avi Chaudhuri Jonathan Nissanov Sylvie Larocque Lise Rioux 《Proceedings of the National Academy of Sciences of the United States of America》1997,94(6):2671-2675
The inducible nature of the immediate-early genes (IEGs) c-fos and zif268 allows their products to be used as activity markers in the brain. The utility of such markers in general is restricted because they can resolve only neurons activated by a single stimulus. To overcome this limitation, we have developed a double-label technique that exploits the dissimilar time course of zif268 mRNA and protein induction, allowing them to be separately induced by two different stimuli and independently stained to provide a visual display of neurons that are responsive to each stimulus. Two powerful features of this new imaging technique—the possibility of staining separate populations of activated neurons and the ability to visualize them at the cellular level—should extend IEG applications in biological activity mapping. 相似文献
5.
6.
Steuart K. Shapira Kent L. Anderson Avi Orr-Urtregar Willaim J. Craigen James R. Lupski Lisa G. Shaffer 《American journal of medical genetics. Part A》1994,52(1):44-50
We report on 2 unrelated patients who had chromosome analysis performed because of psychomotor delay, Failure to thrive, and minor anomalies. Each patient had a novel proximal 14q deletion (q11.2 to q21.1 in patient 737 and q12 to q22 in patient 777). Polymorphic (C-A)n microsatellite markers distributed along the length of chromosome 14q were examined in both patients and their parents in order to determine which marker loci were deleted. The deletion in patient 737 was found to be paternal in origin, based on the analysis of 2 marker loci (D14S54 and D14S70), thus assigning these loci to the deleted interval q11.2 q21.1. Furthermore, 3 loci were not deleted (TCRD, D14S50, and D14S80), suggesting that they are within or proximal to 14q11.2. In the other family (patient 777), none of the markers were fully informative, but the deleted chromosome was determined to be paternally derived based on cytogenetic heteromorphisms. Despite having overlapping proximal 14q deletions, these 2 patients shared few phenotypic similarities except for failure to thrive, micrognathia, and hypoplasia of the corpus callosum. Therefore, a distinct proximal 14q deletion syndrome is not yet apparent. However, the molecular analyses facilitated the localization of several 14q DNA markers to the deletion regions in these 2 patients, while excluding other markers from each deletion. © 1994 Wiley-Liss, Inc. 相似文献
7.
Einat Rabinovitch Dror Harats Pnina Yaron Tamar Luvish Merav Lidar Ron Kedem Aviv Shaish Issahar Ben-Dov Avi Livneh 《Annals of allergy, asthma & immunology》2007,99(6):517-521
BACKGROUND: Asthma is an inflammatory airway disease caused by interaction between susceptibility genes and diverse environmental factors. In Israel, asthma seems to be familial and more severe in patients of Iraqi Jewish descent. On the other hand, asthma is less frequent in individuals with familial Mediterranean fever, an autoinflammatory disease prevalent in the Iraqi Jewish community and linked to mutations in the familial Mediterranean fever gene, designated MEFV. OBJECTIVES: To explore a possible role for mutated MEFV in the reduced susceptibility to asthma and to determine its expression in Israeli subjects of Iraqi origins. METHODS: Using a case-control approach, we studied the presence of the 3 most common MEFV mutations (M694V, V726A, and E148Q) in DNA samples from 75 patients with asthma and 45 asymptomatic first-degree relatives, all of Iraqi Jewish origin. The severity of asthma was evaluated using a published severity score. RESULTS: Eleven patients with asthma and 14 of their relatives carried 1 or 2 mutations in the MEFV gene, a carrier rate significantly lower in patients with asthma than in their first-degree relatives and in ethnically matched healthy individuals (P < .03 and P < .003, respectively). Carriers of MEFV mutations had less severe disease, compared with noncarriers (P < .002). CONCLUSION: These findings suggest that MEFV mutations may have a protective effect in the pathogenesis of asthma. 相似文献
8.
Large-scale protein annotation through gene ontology 总被引:1,自引:0,他引:1
Xie H Wasserman A Levine Z Novik A Grebinskiy V Shoshan A Mintz L 《Genome research》2002,12(5):785-794
9.
Activated status of tumour-infiltrating lymphocytes and apoptosis in testicular seminoma. 总被引:6,自引:0,他引:6
Evgeny Yakirevich Oleg Lefel Yanina Sova Avi Stein Oded Cohen Ofer Ben Izhak Murray B Resnick 《The Journal of pathology》2002,196(1):67-75
Testicular seminoma is characterized by a prominent lymphoid infiltrate and an excellent prognosis. Cytotoxic T-lymphocytes (CTLs) infiltrating seminoma tumour nests constitute a major subset of the lymphoid infiltrate. The objective of this study was to determine whether CTLs express markers of cytotoxic potential and activity and whether the number of activated CTLs correlates with the extent of apoptosis in testicular seminomas, as opposed to non-seminomatous testicular germ cell tumours (NSTGCTs). Twenty cases of pure seminoma as well as 20 cases of NSTGCTs including 16 mixed germ cell tumours (MGCTs) were studied. Immunohistochemistry for the cytotoxic markers TIA-1 (cytotoxic potential) and granzyme B (cytotoxic activity) and the T-cell markers CD3 and CD8 was performed on formalin-fixed, paraffin-embedded sections. The apoptotic index (AI) was determined by the TUNEL method. The number of CD3(+), CD8(+), TIA-1(+), and granzyme B(+) cells in tumour cell nests was markedly increased in testicular seminomas, compared with NSTGCTs (p<0.01). Activated granzyme B(+) cells numbered 25.6+/-5.2 per high power field in seminomas and 8.9+/-3.2, 8.1+/-3.9, and 0.4+/-0.2 for embryonal carcinomas, yolk sac tumours, and immature teratomas, respectively. Double immunohistochemical staining for granzyme B and CD8 revealed that 82.6+/-8.5% of granzyme B-expressing cells were CD8(+). The tumour cell AI was significantly increased in embryonal carcinoma, compared with the seminoma, yolk sac tumour, and immature teratoma subgroups (6.7+/-1.3, 2.3+/-0.3, 3.0+/-1.1, and 2.3+/-1.1, respectively, p<0.001). TUNEL/CD3 double immunostaining revealed that a significant proportion of the apoptotic seminomatous tumour cells were in direct contact with one or more CD3(+) lymphocytes (47.2+/-6.2%). The number of activated granzyme B(+) CTLs showed a strong linear correlation with the AI in the seminoma group (r=0.71, p<0.0001) but not in other subgroups. TUNEL/granzyme B double immunolabelling revealed that a proportion of activated granzyme B(+) lymphocytes (20%) were often seen in close contact with apoptotic tumour cells. The presence of increased numbers of activated cytotoxic lymphocytes in testicular seminomas suggests that apoptotic tumour cell death in this neoplasm may be triggered by cytotoxic granule effectors. This phenomenon may be one of the key host immune mechanisms leading to the excellent prognosis in this tumour. 相似文献
10.