全文获取类型
收费全文 | 7271篇 |
免费 | 487篇 |
国内免费 | 74篇 |
专业分类
耳鼻咽喉 | 64篇 |
儿科学 | 162篇 |
妇产科学 | 348篇 |
基础医学 | 864篇 |
口腔科学 | 103篇 |
临床医学 | 820篇 |
内科学 | 1685篇 |
皮肤病学 | 71篇 |
神经病学 | 539篇 |
特种医学 | 403篇 |
外科学 | 960篇 |
综合类 | 123篇 |
一般理论 | 3篇 |
预防医学 | 351篇 |
眼科学 | 156篇 |
药学 | 538篇 |
中国医学 | 44篇 |
肿瘤学 | 598篇 |
出版年
2023年 | 38篇 |
2022年 | 24篇 |
2021年 | 167篇 |
2020年 | 92篇 |
2019年 | 156篇 |
2018年 | 206篇 |
2017年 | 147篇 |
2016年 | 120篇 |
2015年 | 230篇 |
2014年 | 291篇 |
2013年 | 377篇 |
2012年 | 573篇 |
2011年 | 519篇 |
2010年 | 301篇 |
2009年 | 321篇 |
2008年 | 453篇 |
2007年 | 382篇 |
2006年 | 382篇 |
2005年 | 395篇 |
2004年 | 356篇 |
2003年 | 290篇 |
2002年 | 235篇 |
2001年 | 215篇 |
2000年 | 181篇 |
1999年 | 183篇 |
1998年 | 50篇 |
1997年 | 31篇 |
1996年 | 33篇 |
1995年 | 44篇 |
1994年 | 31篇 |
1993年 | 20篇 |
1992年 | 104篇 |
1991年 | 76篇 |
1990年 | 79篇 |
1989年 | 57篇 |
1988年 | 70篇 |
1987年 | 71篇 |
1986年 | 62篇 |
1985年 | 64篇 |
1984年 | 65篇 |
1983年 | 31篇 |
1982年 | 23篇 |
1979年 | 37篇 |
1978年 | 26篇 |
1977年 | 23篇 |
1976年 | 17篇 |
1975年 | 33篇 |
1974年 | 23篇 |
1973年 | 19篇 |
1971年 | 17篇 |
排序方式: 共有7832条查询结果,搜索用时 171 毫秒
1.
Christopher Yeh Cem Atillasoy John T. Seykora Vivian Lee 《Journal of cutaneous pathology》2021,48(1):171-173
Respiratory cysts are benign lesions lined by normal respiratory epithelium. There are few reported cases localized to the orbit, while those of the eyelid are exceedingly rare. Respiratory cysts usually arise either from a non‐hereditary congenital malformation, where they are distinguished as choristomatous, or from trauma. Here, we report a case of a 53‐year‐old man who presented with a large right lower eyelid cyst that was histopathologically diagnosed as a respiratory cyst. 相似文献
2.
Spitz tumours comprise a spectrum of melanocytic proliferations that share a set of distinct cytological features and molecular pathways. They include benign naevi, intermediate or indeterminate tumours and rare melanomas. Spitz tumours are notorious for the difficulty of distinguishing benign neoplasms with atypical features from melanomas and the related diagnostic uncertainty. Advances in the knowledge of the molecular pathways and genomic aberrations associated with these neoplasms have permitted opportunities for a reduction in the number of uncertain diagnoses and a more objective distinction between Spitz tumours from Spitz-like neoplasms. The presence of a Spitz molecular pathway, such as Harvey rat sarcoma viral oncogene homologue (HRAS) aberrations or kinase fusions, distinguishes a bona fide Spitz neoplasm from Spitz-like naevi or melanomas with conventional driver mutations. Spitz neoplasms with benign histopathological features and, if such testing is performed, benign cytogenetic and molecular findings, are termed Spitz naevi. Spitz neoplasms with frankly malignant histopathological findings or ambiguous microscopic findings associated with genetic or genomic aberrations most in keeping with melanoma are designated as Spitz melanoma. Tumours with microscopic features and genetic/genomic aberrations in between naevi and melanomas are classified as Spitz melanocytoma. 相似文献
3.
4.
Yasmine Assadipour Hui Zhou Eric J. Kuo Philip I. Haigh Annette L. Adams Michael W. Yeh 《Surgery》2019,165(1):99-104
Background
Patients with primary hyperparathyroidism are at risk for skeletal and renal end-organ damage.Methods
We studied patients with biochemically confirmed primary hyperparathyroidism from 1995–2014 and quantified the frequency of osteoporosis, nephrolithiasis, hypercalciuria, and decrease in renal function.Results
The cohort comprised 9,485 patients. In total, 3,303 (35%) had preexisting end-organ effects (osteoporosis, 24%; nephrolithiasis, 10%; hypercalciuria, 5%). Of 6,182 remaining patients, 1,769 (29%) exhibited progression to 1 or more end-organ effects over a median 3.7 years. Among patients with classic primary hyperparathyroidism (calcium and parathyroid hormone increased), progression was unrelated to the degree of hypercalcemia (calcium >11.5 mg/dL, hazard ratio 1.03, 95% confidence interval 0.85–1.25; 11.1–11.5 mg/dL, HR 1.07, 95% confidence interval 0.93–1.23; 10.5–11.0 mg/dL?=?reference). Patients with nonclassic primary hyperparathyroidism (calcium increased, parathyroid hormone 40–65 pg/mL) had a lesser risk of progression (calcium >11.5 mg/dL, hazard ratio 0.68, 95% confidence interval 0.50–0.94; 11.1–11.5 mg/dL, hazard ratio 0.68, 95% confidence interval 0.56–0.82; 10.5–11.0 mg/dL, hazard ratio 0.66, 95% confidence interval 0.59–0.74). End-organ damage developed before or within 5 years of diagnosis for 62% of patients.Conclusion
End-organ manifestations of primary hyperparathyroidism develop before biochemical diagnosis or within 5 years in most patients. End-organ damage occurred more frequently in patients with classic primary hyperparathyroidism versus nonclassic primary hyperparathyroidism, regardless of severity of hypercalcemia. 相似文献5.
6.
7.
Da-wei Wang Ying-juan Xu Xin Li Chao-ming Huang Kuo-shien Huang Chuen-kai Wang Jen-taut Yeh 《Materials》2015,8(6):3168-3194
The waterproof and strength retention properties of bacterial cellulose (BC)-reinforced thermoplastic starch (TPS) resins were successfully improved by reacting with sodium hexametaphosphate (SHMP). After modification with SHMP, the tensile strength (σf) and impact strength (Is) values of initial and conditioned BC-reinforced TPS, modified with varying amounts of SHMP(TPS100BC0.02SHMPx), and their blends with poly(lactic acid)((TPS100BC0.02SHMPx)75PLA25) specimens improved significantly and reached a maximal value as SHMP content approached 10 parts per hundred parts of TPS resin (phr), while their moisture content and elongation at break (ɛf) was reduced to a minimal value as SHMP contents approached 10 phr. The σf, Is and ɛf retention values of a (TPS100BC0.02SHMP10)75PLA25 specimen conditioned for 56 days are 52%, 50% and 3 times its initial σf, Is and ɛf values, respectively, which are 32.5 times, 8.9 times and 40% of those of a corresponding conditioned TPS100BC0.02 specimen, respectively. As evidenced by FTIR analyses of TPS100BC0.02SHMPx specimens, hydroxyl groups of TPS100BC0.02 resins were successfully reacted with the phosphate groups of SHMP molecules. New melting endotherms and diffraction peaks of VH-type crystals were found on DSC thermograms and WAXD patterns of TPS or TPS100BC0.02 specimens conditioned for 7 days, while no new melting endotherm or diffraction peak was found for TPS100BC0.02SHMPx and/or (TPS100BC0.02SHMPx)75PLA25 specimens conditioned for less than 14 and 28 days, respectively. 相似文献
8.
9.
10.