全文获取类型
收费全文 | 274篇 |
免费 | 13篇 |
出版年
2022年 | 4篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 14篇 |
2017年 | 10篇 |
2016年 | 5篇 |
2015年 | 7篇 |
2014年 | 13篇 |
2013年 | 29篇 |
2012年 | 15篇 |
2011年 | 11篇 |
2010年 | 7篇 |
2009年 | 10篇 |
2008年 | 16篇 |
2007年 | 14篇 |
2006年 | 12篇 |
2005年 | 9篇 |
2004年 | 8篇 |
2003年 | 6篇 |
2002年 | 5篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1995年 | 2篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1975年 | 2篇 |
1974年 | 4篇 |
1973年 | 2篇 |
1971年 | 2篇 |
1964年 | 2篇 |
1963年 | 3篇 |
1962年 | 2篇 |
1961年 | 3篇 |
1958年 | 2篇 |
1955年 | 2篇 |
排序方式: 共有287条查询结果,搜索用时 15 毫秒
161.
Corticosterone time-dependently modulates beta-adrenergic effects on long-term potentiation in the hippocampal dentate gyrus
下载免费PDF全文
![点击此处可从《Learning & memory (Cold Spring Harbor, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Previous experiments in the hippocampal CA1 area have shown that corticosterone can facilitate long-term potentiation (LTP) in a rapid non-genomic fashion, while the same hormone suppresses LTP that is induced several hours after hormone application. Here, we elaborated on this finding by examining whether corticosterone exerts opposite effects on LTP depending on the timing of hormone application in the dentate gyrus as well. Moreover, we tested rapid and delayed actions by corticosterone on β-adrenergic-dependent changes in LTP. Unlike the CA1 region, our in vitro field potential recordings show that rapid effects of corticosterone do not influence LTP induced by mild tetanization in the hippocampal dentate gyrus, unless GABAA receptors are blocked. In contrast, the β-adrenergic agonist isoproterenol does initiate a slow-onset, limited amount of potentiation. When corticosterone was applied concurrently with isoproterenol, a further enhancement of synaptic strength was identified, especially during the early stage of potentiation. Yet, treatment with corticosterone several hours in advance of isoproterenol fully prevented any effect of isoproterenol on LTP. This emphasizes that corticosterone can regulate β-adrenergic modulation of synaptic plasticity in opposite directions, depending on the timing of hormone application. 相似文献
162.
Marian Hickendorff Willem J. Heiser Cornelis M. van Putten Norman D. Verhelst 《Psychometrika》2009,74(2):367-374
In this rejoinder, we discuss substantive and methodological validity issues of large-scale assessments of trends in student achievement, commenting on the discussion paper by Van den Heuvel-Panhuizen, Robitzsch, Treffers, and Köller (2009). We focus on methodological challenges in deciding what to measure, how to measure it, and how to foster stability. Next, we discuss what to do with trends that are found. Finally, we reflect on how the research findings were received. 相似文献
163.
Marian J. Rossiter Katherine R. Rossiter 《Journal of International Migration and Integration》2009,10(4):409-429
Immigrant youth come to Canada with enormous potential to make a significant, positive contribution to the future of their adopted country. In many cases, this potential is realised; in others, it is not. The ease with which immigrant youth and their families integrate into Canadian society has a strong impact on their futures; those who become marginalised during this process risk becoming alienated or involved with the criminal justice system. Interviews were conducted with 12 stakeholders (including representatives from social service agencies, community groups and the criminal justice and forensic mental health systems) who frequently come into contact with immigrant and refugee youth involved in criminal and/or gang activity. Based on the family, individual, peer, school and community risk and protective factors reported to have an influence on immigrant and refugee youth, recommendations are made for bridging gaps in programming and policy initiatives to support at-risk youth. 相似文献
164.
Reviewing the studies on differential susceptibility presented in this section, we argue that the time is ripe to go beyond correlational designs to differential susceptibility experiments. In such experiments, randomization prevents hidden moderator effects on the environment and guarantees the independence of moderator and outcome, while the environment is manipulated and assessed in standard ways. Correlational studies generate a priori expectations about crucial moderators (e.g., temperament, biological sensitivity, and genetics). We discuss the differential susceptibility experiments available up until now and conclude that these experiments are feasible and contribute in unique ways to our conceptions of differential susceptibility. 相似文献
165.
Bilinguals have been shown to activate their two languages in parallel, and this process can often be attributed to overlap in input between the two languages. The present study examines whether two languages that do not overlap in input structure, and that have distinct phonological systems, such as American Sign Language (ASL) and English, are also activated in parallel. Hearing ASL-English bimodal bilinguals' and English monolinguals' eye-movements were recorded during a visual world paradigm, in which participants were instructed, in English, to select objects from a display. In critical trials, the target item appeared with a competing item that overlapped with the target in ASL phonology. Bimodal bilinguals looked more at competing item than at phonologically unrelated items and looked more at competing items relative to monolinguals, indicating activation of the sign-language during spoken English comprehension. The findings suggest that language co-activation is not modality specific, and provide insight into the mechanisms that may underlie cross-modal language co-activation in bimodal bilinguals, including the role that top-down and lateral connections between levels of processing may play in language comprehension. 相似文献
166.
Marian De Souza 《Journal of Contemporary Religion》2012,27(3):534-536
167.
168.
Despite increased attention to the role of fathers within families, there is still a dearth of studies on the impact of trauma on father‐involvement. This study investigates the quantity of father‐involvement and the influence of posttraumatic stress on the quality of involvement in a refugee and asylum seeker population. Eighty refugees and asylum seekers and their young children (aged 18–42 months) were recruited. Measures included assessment of parental trauma (Harvard Trauma Questionnaire), quantity and quality of involvement (quantity of caregiving and Emotional Availability Scales), and perception of the father–child relationship (interview). The results show that fathers were less involved in caregiving tasks and play activities than mothers. No parental gender differences were found on each of the Emotional Availability Scales. Traumatic stress symptoms negatively affected the perception and the actual quality of parent–child interaction (sensitivity, structuring, nonhostility). Nevertheless, almost all fathers described their relationship with their child as good and their child as very important to them. As the quality of father‐involvement is of importance to the development of the child, traumatized fathers are as much in need of clinical intervention as mothers. Despite the impact of posttraumatic stress, refugee fathers clearly are involved in the lives of their children. Mechanisms such as a deliberate withdrawal when stressed and compensation might enable affected fathers to step into the interaction when needed, raise the quality of involvement with their child, and diminish the negative impact of stress resulting from trauma and migration. 相似文献
169.
Marian Zouhar 《逻辑史和逻辑哲学》2013,34(3):199-209
Fregean thoughts (i.e. the senses of assertoric sentences) are structured entities because they are composed of simpler senses that are somehow ordered and interconnected. The constituent senses form a unity because some of them are ‘saturated’ and some ‘unsaturated’. This paper shows that Frege's explanation of the structure of thoughts, which is based on the ‘saturated/unsaturated’ distinction, is by no means sufficient because it permits what I call ‘wild analyses’, which have certain unwelcome consequences. Wild analyses are made possible because any ‘unsaturated’ sense that is a mode of presentation of a concept together with any ‘saturated’ sense forms a thought. The reason is that any concept can be applied to any object (which is presented by a ‘saturated’ sense). This stems from the fact that Frege was willing to admit only total functions. It is also briefly suggested what should be done to block wild analyses. 相似文献
170.
Judi Mesman Marielle LintingKatharina J. Joosen Marian J. Bakermans-KranenburgMarinus H. van IJzendoorn 《Infant behavior & development》2013
In the present study we examined key issues regarding infant behavior in the still-face paradigm (SFP) in terms of individual variations, stability, and predictors. The sample consisted of 115 mothers and infants, with assessments at ages 3 and 6 months, including observations of maternal and infant behavior in the SFP, and parent reports of infant temperament. Both robust patterns and individual variations in infant SFP behaviors were found, with only a minority of infants showing the expected patterns for negative affect and gaze. Infant behavior patterns showed no stability from age 3 to 6 months, and infant gaze was related to more pronounced behavior changes across the SFP. Maternal sensitivity in the SFP baseline was related to some aspects of infant SFP behavior. Consistent with the differential susceptibility hypothesis, in infants with a more difficult temperament maternal sensitivity predicted a more pronounced expected pattern of changes in infant positive affect across the SFP, whereas this was not the case for infants with a more easy temperament. 相似文献