全文获取类型
收费全文 | 1563篇 |
免费 | 62篇 |
国内免费 | 18篇 |
出版年
2024年 | 2篇 |
2023年 | 51篇 |
2022年 | 44篇 |
2021年 | 29篇 |
2020年 | 44篇 |
2019年 | 54篇 |
2018年 | 52篇 |
2017年 | 56篇 |
2016年 | 49篇 |
2015年 | 24篇 |
2014年 | 70篇 |
2013年 | 303篇 |
2012年 | 19篇 |
2011年 | 61篇 |
2010年 | 68篇 |
2009年 | 58篇 |
2008年 | 88篇 |
2007年 | 76篇 |
2006年 | 93篇 |
2005年 | 56篇 |
2004年 | 44篇 |
2003年 | 27篇 |
2002年 | 28篇 |
2001年 | 24篇 |
2000年 | 56篇 |
1999年 | 21篇 |
1998年 | 20篇 |
1997年 | 17篇 |
1996年 | 11篇 |
1995年 | 9篇 |
1994年 | 13篇 |
1993年 | 10篇 |
1992年 | 6篇 |
1991年 | 6篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 6篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 8篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 6篇 |
1975年 | 1篇 |
排序方式: 共有1643条查询结果,搜索用时 15 毫秒
231.
母婴垂直传播是我国乙型肝炎病毒(HBV)感染的主要传播方式,新生儿标准的主动一被动免疫即高效价乙肝免疫球蛋白联合乙肝疫苗大大降低了母婴垂直传播的比例,但母体高HBVDNA水平可以增加胎儿宫内感染HBV的风险,导致HBV母婴垂直传播。因此,妊娠期抗病毒治疗尤为关键。计划妊娠的育龄期的慢性乙型肝炎患者应尽可能在妊娠前完成抗... 相似文献
232.
循环肿瘤细胞(circulating tumor cells,CTCs)指自发或因诊疗操作由实体瘤或转移灶释放进入外周血循环的肿瘤细胞。CTCs能被看作液体活检,具有实时监测功能,是一种非侵入性的新型诊断工具,有助于早期发现肿瘤的微转移,可评估预后,在治疗的监测及个体化治疗上具有重要的临床意义。 相似文献
233.
We review recommendations for sequencing instruction in receptive and expressive language objectives in early and intensive behavioral intervention (EIBI) programs. Several books recommend completing receptive protocols before introducing corresponding expressive protocols. However, this recommendation has little empirical support, and some evidence exists that the reverse sequence may be more efficient. Alternative recommendations include teaching receptive and expressive skills simultaneously (M. L. Sundberg & Partington, 1998) and building learning histories that lead to acquisition of receptive and expressive skills without direct instruction (Greer & Ross, 2008). Empirical support for these recommendations also is limited. Future research should assess the relative efficiency of receptive-before-expressive, expressive-before-receptive, and simultaneous training with children who have diagnoses of autism spectrum disorders. In addition, further evaluation is needed of the potential benefits of multiple-exemplar training and other variables that may influence the efficiency of receptive and expressive instruction. 相似文献
234.
卵巢肿瘤是妇科常见肿瘤之一,可分为良性、恶性、交界性肿瘤,及时处理卵巢良性肿瘤具有重要意义,但关于如何避免卵巢良性肿瘤的过度治疗,尚无定论。目前为止,关于卵巢肿瘤发生、发展机制的基础研究和诊疗技术正在取得较大的进步,对临床医师发挥着重要的指导和辅助作用。如何正确诊断卵巢良性肿瘤,如何选择合适的手术方式、实现个体化治疗,是避免卵巢良性肿瘤的过度治疗的关键。 相似文献
235.
老年甲状腺结节的诊治经验 总被引:1,自引:0,他引:1
介绍笔者及科室老年甲状腺结节的诊治经验,对2003年1月至2009年12月期间共收治的144例年龄大于60岁的老年甲状腺结节患者进行分析和总结。老年甲状腺结节以多发为主;压迫症状、异物和不适感、继发性甲状腺功能亢进是老年甲状腺结节患者主要的手术指证;术中发现喉返神经和甲状旁腺有脂肪沉着;病理方面良性结节的钙化率较高;患者术后切口水肿比较明显;暂时性低钙血症的发生率较高;虽然术前麻醉ASA评分较低,但术后心肺并发症的发生率并未上升。老年甲状腺结节患者以全麻为宜,最好采用双甲近全切除术,这不仅可避免术后复发和再次手术率,更可减少甲状腺素制剂的用量,减少药物副作用。 相似文献
236.
通过对临床收集的187例青年(≤45岁)颈心综合征患者的临床资料进行分析。探讨青年颈心综合征临床误诊为冠心病的原因及避免误诊的诊疗策略。目的在于帮助临床医师对青年颈心综合征进行识别,注意如何与冠心病心绞痛相鉴别,对防止病情延误,尽早明确诊断积极治疗,排除冠心病,减少诊疗费用及避免冠脉造影的风险意义很大。 相似文献
237.
重症手足口病的早期识别与处理 总被引:1,自引:0,他引:1
陈永平 《医学与哲学(人文社会医学版)》2010,(9):12-14
手足口病(hand-foot-mouth disease,HFMD)是由肠道病毒[以柯萨奇A组16型(Coxsackievirus A16,CoxA16)、肠道病毒71型(Enterovirus 71,EV71)多见]引起的急性传染病,而重症多由EV71感染引起。由于EV71的高度嗜神经性,重症者可合并中枢神经系统(central nervous system,CNS)损害、急性肺水肿/出血等。现就重症手足口病的早期识别与处理进行简要综述。 相似文献
238.
麻疹是一种急性呼吸道传染病,常见于6月~5岁儿童。近年来婴儿和成人麻疹患者在总患者数中所占比率表现出上升的趋势,容易造成误诊、漏诊。作为临床工作者,我们认为临床医生应充分认识到麻疹发病人群及年龄的改变,在临床工作中减少误诊,并为患者提供及时有效的治疗,对高危人群的有计划干预对于减低成人麻疹发病率有着重要作用。本文针对婴儿和成人麻疹的诊断和治疗进行了综述,试图提供参考。 相似文献
239.
Pharmacological treatment effects on eye movement control 总被引:1,自引:1,他引:0
James L. Reilly Rebekka Lencer Jeffrey R. Bishop Sarah Keedy John A. Sweeney 《Brain and cognition》2008,68(3):415
The increasing use of eye movement paradigms to assess the functional integrity of brain systems involved in sensorimotor and cognitive processing in clinical disorders requires greater attention to effects of pharmacological treatments on these systems. This is needed to better differentiate disease and medication effects in clinical samples, to learn about neurochemical systems relevant for identified disturbances, and to facilitate identification of oculomotor biomarkers of pharmacological effects. In this review, studies of pharmacologic treatment effects on eye movements in healthy individuals are summarized and the sensitivity of eye movements to a variety of pharmacological manipulations is established. Primary findings from these studies of healthy individuals involving mainly acute effects indicate that: (i) the most consistent finding across several classes of drugs, including benzodiazepines, first- and second- generation antipsychotics, anticholinergic agents, and anticonvulsant/mood stabilizing medications is a decrease in saccade and smooth pursuit velocity (or increase in saccades during pursuit); (ii) these oculomotor effects largely reflect the general sedating effects of these medications on central nervous system functioning and are often dose-dependent; (iii) in many cases changes in oculomotor functioning are more sensitive indicators of pharmacological effects than other measures; and (iv) other agents, including the antidepressant class of serotonergic reuptake inhibitors, direct serotonergic agonists, and stimulants including amphetamine and nicotine, do not appear to adversely impact oculomotor functions in healthy individuals and may well enhance aspects of saccade and pursuit performance. Pharmacological treatment effects on eye movements across several clinical disorders including schizophrenia, affective disorders, attention deficit hyperactivity disorder, Parkinson’s disease, and Huntington’s disease are also reviewed. While greater recognition and investigation into pharmacological treatment effects in these disorders is needed, both beneficial and adverse drug effects are identified. This raises the important caveat for oculomotor studies of neuropsychiatric disorders that performance differences from healthy individuals cannot be attributed to illness effects alone. In final sections of this review, studies are presented that illustrate the utility of eye movements for use as potential biomarkers in pharmacodynamic and pharmacogenetic studies. While more systematic studies are needed, we conclude that eye movement measurements hold significant promise as tools to investigate treatment effects on cognitive and sensorimotor processes in clinical populations and that their use may be helpful in speeding the drug development pathway for drugs targeting specific neural systems and in individualizing pharmacological treatments. 相似文献
240.
To examine the adjustment of child-related goal appraisals during infertility treatment and whether such adjustment contributes to depressive symptoms 178 (86 men, 92 women; age for women M = 33.92, SD = 0.34, for men M = 35.68, SD = 0.45) patients at an Infertility Clinic filled in child-related goal appraisal questionnaires six times: (1) before starting the hormone injections, (2) before the oocytes were retrieved, (3) after embryo transfer, (4) the day when the pregnancy test was done, and (5) two and (6) six months after the infertility treatment. At the first and last measurement times they filled in questionnaire on depressive symptoms. Appraisals concerning child-related goal changed in tandem with the treatment result, and goal adjustment had an effect on depressive symptoms. 相似文献