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731.
732.
This experiment exposed 3rd and 4th y undergraduates and graduate students taking a course in advanced food analysis to DNA extraction, polymerase chain reaction (PCR), and DNA sequence analysis. Students provided their own fish sample, purchased from local grocery stores, and the class as a whole extracted DNA, which was then subjected to PCR, gel electrophoresis, and Sanger sequencing. Students retrieved their sequences and identified their fish using the NCBI BLAST nucleotide database. Slightly more than half of the samples yielded sequences identical or close to expected (based on the identification of the fish on the packaging); some other samples matched unanticipated fish or other organisms, due to an incomplete database, minor sequencing errors, or laboratory contamination (human and fungal sequences); 1 canned tuna sample identified as hake could represent food fraud.  相似文献   
733.
In this study, Social Cognitive Career Theory (SCCT) is used to explore changes in the career intentions of students in an undergraduate research experience (URE) program at a large public minority‐serving college. Our URE model addresses the challenges of establishing an undergraduate research program within an urban, commuter, underfunded, Minority‐Serving Institution (MSI). However, our model reaches beyond a focus on retention and remediation toward scholarly contributions and shifted career aspirations. From a student's first days at the College to beyond their graduation, we have encouraged them to explore their own potential as scientists in a coordinated, sequential, and self‐reflective process. As a result, while the program's graduates have traditionally pursued entry‐level STEM jobs, graduates participating in mentored research are increasingly focused on professional and academic STEM career tracks involving post‐graduate study. In addition to providing an increasingly expected experience and building students’ skills, participation in undergraduate research is seen to have a transformative effect on career ambitions for many students at MSIs. While undergraduate research is often thought of in context of majority‐serving institutions, we propose that it serves as a powerful equalizer at MSIs. Building on the institutional characteristics that drive diversity, our students produce scholarly work and pursue graduate degrees, in order to address the long‐standing under‐representation of minorities in the sciences. © 2016 Wiley Periodicals, Inc. J Res Sci Teach 54: 169–194, 2017  相似文献   
734.
735.
Maternal parenting and children's conscience: early security as moderator   总被引:1,自引:0,他引:1  
Socialization research is shifting from direct links between parenting and children's outcomes toward models that consider parenting in the context of other factors. This study proposed that the effects of maternal responsive, gentle parenting on child conscience are moderated by the quality of their relationship, specifically, early security. A 2-process model of early conscience development was proposed and confirmed in this longitudinal study. The child's security and trust in the caregiver, assessed at 14 months in the Strange Situation, rendered him or her receptive and eager to accept the caregiver's socialization agenda. That early security then enhanced the effectiveness of parental adaptive parenting style, observed from 14 to 45 months, in terms of promoting conscience at 56 months, which encompassed moral conduct, moral cognition, and moral self.  相似文献   
736.
OBJECTIVE: The current study was conducted to determine if post-traumatic stress disorder (PTSD) symptomatology predicted later development of non-PTSD anxiety disorders in children and adolescents victimized by interpersonal trauma. METHODS: Thirty-four children with a history of interpersonal trauma and no initial diagnosis of anxiety disorder participated in the study. Children were assessed at time one (T1) and then 12-18 months later at time two (T2). At T1, the Clinician Administered PTSD Scale for Children and Adolescents (CAPS-CA) and the Schedule for Affective Disorders and Schizophrenia for School-Age Children-Present and Lifetime Version (K-SADS-PL) were used to evaluate children's PTSD symptoms and comorbid non-PTSD anxiety disorder diagnosis. At T2, the CAPS-CA and the K-SADS-PL were repeated. RESULTS: The diagnosis of PTSD and PTSD symptoms in children exposed to interpersonal trauma at T1, particularly the symptoms associated with avoidance and constricted emotional expression (criteria C) as well as physiological hyperarousal (criteria D), predicted the development of other anxiety disorders at T2. CONCLUSION: Traumatized children with initial PTSD symptomatology may be at risk of later development of other anxiety disorders.  相似文献   
737.
Audio‐teleconferencing which allows peer interaction has been proposed as a potentially effective means to increase student completion rates in distance education courses. This hypothesis was examined in two experiments in which audio‐conferences were added to a telecourse which also included live‐interactive (one‐way video, two‐way audio) segments. Although there were differences in the completion rates between the groups of students involved in the audio‐teleconferencing and the control groups, these were not found to be statistically significant. It is suggested that the on‐air live interactive telecourse component may have made the audio‐teleconferences redundant. There were generally high completion rates overall.  相似文献   
738.
Relations between children's peer play competence and other relevant competencies were investigated using two samples of urban Head Start children. Dimensions of peer play were examined concurrently with emotion regulation, autonomy, and language. Children exhibiting high levels of peer play interaction were found to demonstrate more competent emotional‐regulation, initiation, self‐determination, and receptive vocabulary skills. Assessments of positive engagement in play early in the year were associated with lower levels of aggressive, shy, and withdrawn adjustment problems at the end of the year. Children who successfully interacted with peers early in the year evidenced greater cognitive, social, and movement/coordination outcomes. Disruptive and disconnected peer play behaviors were associated with negative emotional and behavioral outcomes. © 2004 Wiley Periodicals, Inc. Psychol Schs 41: 323–336, 2004.  相似文献   
739.
The aim of this study was to examine the relationships between mothers’ self-efficacy beliefs, their preschool children’s home learning environments, and literacy skills. A sample of 112 mother–child dyads was recruited from Head Start centers in rural and urban communities. The measures included maternal self-efficacy and maternal perceptions of child’s readiness to read as well as the Stipek Home Learning Activities (SHLA) scale, Home-Learning Environment Profile (HLEP), and the Stony Brook Family Reading Survey (SBFRS). Modeling path analysis was performed. Model fit indices indicated that the resulting model was a good fit for the data. Concerning the direct effects of maternal self-efficacy on home learning environment, positive significant effects for the SHLA measure as well as the HLEP were found. However, no direct effect was found with regard to maternal self-efficacy on SBFRS indicating evidence for the domain specificity of efficacy beliefs. Implications of the study include findings that higher maternal self-efficacy is related to creating a more positive home learning environment. Additionally, higher maternal perceptions of child readiness to read mediates the relationships between higher maternal self-efficacy and a more positive home literacy environment. Moreover, these findings highlight the link between home learning environment and children’s receptive vocabulary skills.  相似文献   
740.
STEM, an acronym for Science, Technology, Engineering and Mathematics, is widely used in science education. There is confusion, however, as to its provenance and meaning which is potentially problematic. This study examines the purpose of STEM practice in education in England and asks if there are differences in perceptions of STEM between science and mathematics educator stakeholders. The study’s contribution to the literature is its unusual focus on those who were responsible for making and enacting national STEM policy. A two-phase qualitative approach was followed comprising an analysis of government documentation together with semi-structured interviews with key contributors to the science and mathematics education discourse. Findings suggest that there is a disconnect between the interpretations of the science and mathematics educators with a danger-advantage dichotomy to participation in STEM being perceived by the mathematics educators. Early aims of the STEM agenda, including increasing diversity, gave way to a focus on numbers of post-16 physics and mathematics students. We conclude that if the term STEM is to continue to be used then there is a need for greater clarity about what it represents in educational terms and a wider debate about its compatibility with the aims of science education for all.  相似文献   
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