全文获取类型
收费全文 | 9348篇 |
免费 | 1109篇 |
国内免费 | 90篇 |
专业分类
耳鼻咽喉 | 107篇 |
儿科学 | 254篇 |
妇产科学 | 257篇 |
基础医学 | 1399篇 |
口腔科学 | 167篇 |
临床医学 | 1075篇 |
内科学 | 1767篇 |
皮肤病学 | 118篇 |
神经病学 | 767篇 |
特种医学 | 536篇 |
外国民族医学 | 10篇 |
外科学 | 1299篇 |
综合类 | 280篇 |
一般理论 | 5篇 |
预防医学 | 843篇 |
眼科学 | 207篇 |
药学 | 686篇 |
中国医学 | 9篇 |
肿瘤学 | 761篇 |
出版年
2021年 | 159篇 |
2020年 | 93篇 |
2019年 | 163篇 |
2018年 | 194篇 |
2017年 | 147篇 |
2016年 | 138篇 |
2015年 | 178篇 |
2014年 | 214篇 |
2013年 | 297篇 |
2012年 | 396篇 |
2011年 | 464篇 |
2010年 | 243篇 |
2009年 | 239篇 |
2008年 | 396篇 |
2007年 | 437篇 |
2006年 | 388篇 |
2005年 | 358篇 |
2004年 | 329篇 |
2003年 | 326篇 |
2002年 | 327篇 |
2001年 | 297篇 |
2000年 | 298篇 |
1999年 | 255篇 |
1998年 | 142篇 |
1997年 | 120篇 |
1996年 | 122篇 |
1995年 | 109篇 |
1994年 | 98篇 |
1993年 | 84篇 |
1992年 | 228篇 |
1991年 | 196篇 |
1990年 | 176篇 |
1989年 | 175篇 |
1988年 | 181篇 |
1987年 | 175篇 |
1986年 | 183篇 |
1985年 | 188篇 |
1984年 | 108篇 |
1983年 | 116篇 |
1982年 | 85篇 |
1980年 | 76篇 |
1979年 | 124篇 |
1978年 | 106篇 |
1977年 | 82篇 |
1976年 | 102篇 |
1975年 | 76篇 |
1974年 | 99篇 |
1973年 | 118篇 |
1972年 | 87篇 |
1970年 | 74篇 |
排序方式: 共有10000条查询结果,搜索用时 109 毫秒
51.
53.
Donor bone grafts are an important aspect of orthopaedic surgery. The use of plain film as a pathological screening tool before
donor bone dispatch has revealed “lytic” lesions in proximal humeri. Donor demographics did not support the diagnosis of myeloma
and subsequent computed tomography (CT) scans of these bones identified the lesions as air, not pathology. In total, 27 long
bones were scanned and 100% (27/27 cases) exhibited air within the trabecular bone. Three distinct patterns were found: ovoid,
linear/branching, and broad channel. A longitudinal course of CT scans was performed to identify at which stage air appeared
within the bone. Pre-retrieval, preprocessing, and postprocessing scans revealed that air originated between the retrieval
and preprocessing stages of donor bone preparation. There may be multiple aetiology of this phenomenon, including bone retrieval
and natural decomposition. 相似文献
54.
Marc D Moncrieff Stuart A Hamilton George H Lamberty Charles M Malata David G Hardy Robert Macfarlane David A Moffat 《Journal of plastic, reconstructive & aesthetic surgery》2007,60(6):607-614
Squamous cell carcinoma (SCC) of the temporal bone is a rare, aggressive and highly malignant tumour that requires specialised, multidisciplinary surgery for its treatment. Reconstruction of the defect is as crucial as the tumour ablation in terms of mortality and postoperative morbidity. METHODS: The experience of the East Anglian Skull Base Surgery Service from 1982 to 2004 in managing 42 consecutive patients (22 females; age range 37-80 years) undergoing extended and lateral temporal bone resection for SCC is presented. RESULTS: The overall 5-year survival was 31.0% (median follow up: 97 months) when both curative and palliative procedures were included. On multivariate analysis, the favourable prognostic factors were male sex, well-differentiated tumours and stage N(0) neck. The reconstructions in 38 patients were analysed. The majority (24/38) had free tissue transfer reconstructions and most of these were radial forearm free flaps. Later in the series, other free flap types such as anterolateral thigh flaps and lateral arm flaps were employed. Pedicled myocutaneous flaps and local flaps were also used. CONCLUSIONS: This paper analyses the outcomes of the various reconstructions and discusses the evolution of their care in our unit. The information obtained from the review of our data is extrapolated to offer guidance on the choice of reconstructive option in these patients. 相似文献
55.
56.
Maximum Residue Limits (MRLs) are standards that represent the maximum residue concentration expected to be found if a pesticide is applied according to good agricultural practice (GAP). MRLs are established only where the residues in food resulting from particular use patterns of the pesticide pass the public health risk assessment. Foodstuffs are monitored for MRL compliance and MRL exceedance can have economic and trade consequences. There is a trade-off when deciding on values for MRLs. The aim is to establish MRLs at levels that are high enough to prevent chance exceedance but not so high that misuse will not be detected. Small data sets typically available for estimating MRLs present problems for establishing consistent values. A review of MRL estimation methods is presented together with an assessment of the various methods. 相似文献
57.
David W. Hamilton Kenneth P. Roberts 《Asian journal of andrology》2007,9(4):582-582
Looking at the history of epididymal research provides a level of confidence in predictions of cause and effect that looking at the future cannot achieve. Thus, when one of us (Hamilton, 2002) wrote a short essay on the history of the testicular excurrent ducts it became fairly obvious that advances in understanding the epididymis followed advances in other fields, particularly those that provided new instrumentation to probe at ever finer levels of detail. Can this same theme lead to predictions about what will happen in epididymis research over the next century? 相似文献
58.
Cisplatin and its analogs have become important components of chemotherapeutic regimens for the treatment of solid tumors, however, their overall effectiveness is limited by the emergence of drug-resistant tumor cells. Resistance to the platinum drugs is multifactorial consisting of mechanisms that prevent the formation of lethal platinum-DNA adducts and mechanisms that operate downstream of the drug/target interaction to promote cell survival. Continued progress in the study of the drug resistance phenotype as well as the development of new platinum analogs may eventually lead to improved therapies and increased survival rates. 相似文献
59.
60.
AR Jones BSC AJP Sandison FRCS WJ Owen MS FRCS 《International journal of clinical practice》1997,51(5):294-295
Pre-clerking of all patients undergoing elective general surgical operations was introduced at our hospital in an attempt to reduce an unacceptably high operation cancellation rate. A prospective audit has been performed on the effect of this policy on the cancellation rate. Before the introduction of pre-clerking there was a marked seasonal variation in the number of patients who failed to attend for surgery, which could be explained by absence on holiday. This seasonal variation disappeared after the start of pre-clerking clinics, but there has been no reduction in the number of cancellations for medical reasons. 相似文献