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Costa L.M.,University of Oxford | Costa L.M.,Plant Research International | Marshall E.,University of Warwick | Marshall E.,Plant Research International | And 13 more authors.
Science | Year: 2014

Plant embryogenesis initiates with the establishment of an apical-basal axis; however, the molecular mechanisms accompanying this early event remain unclear. Here, we show that a small cysteine-rich peptide family is required for formation of the zygotic basal cell lineage and proembryo patterning in Arabidopsis. EMBRYO SURROUNDING FACTOR 1 (ESF1) peptides accumulate before fertilization in central cell gametes and thereafter in embryo-surrounding endosperm cells. Biochemical and structural analyses revealed cleavage of ESF1 propeptides to form biologically active mature peptides. Further, these peptides act in a non - cell-autonomous manner and synergistically with the receptor-like kinase SHORT SUSPENSOR to promote suspensor elongation through the YODA mitogen-activated protein kinase pathway. Our findings demonstrate that the second female gamete and its sexually derived endosperm regulate early embryonic patterning in flowering plants. Source


Glazer H.R.,Capella University
American Journal of Hospice and Palliative Medicine | Year: 2010

The death of a spouse is a complicated experience in a family. Understanding the circumstances of the loss is part of the family's healing process. The current qualitative phenomenological study builds on the existing studies by focusing on the lived experience of parents as they transition to single parenthood. Six individuals participated in this study. Data analysis revealed 5 themes related to the change to single parenting after the loss of the spouse including the need to revision the parenting role and the role of support. The study has implications for the design of interventions and groups following the death of a spouse. © The Author(s) 2010. Source


Grann J.,Capella University
CEUR Workshop Proceedings | Year: 2016

Although students regularly demonstrate career-relevant competencies in postsecondary programs, it is difficult to document and communicate these accomplishments beyond the institution. Portfolios and microcredentials are intended to help solve these problems, but neither have been widely adopted or regularly expected amongst hiring managers. This paper speculates that a significant barrier to adoption has been the absence of a shared competency data model for educators and human resource professionals. A competency data model used to solve educational technology interoperability problems is presented. Discussion highlights synergistic projects that, if connected via a shared competency data model, could help adults advocate for their career goals using evidence from multiple contexts. © Copyright 2016 for this paper by its authors. Source


Haynes C.R.,Capella University
Educational Gerontology | Year: 2016

Human immunodeficiency virus (HIV) is steadily increasing among the baby boom population. Among this population, there is a gap between knowledge and behavioral choices. HIV risk perception is multifaceted and shaped by different sociodemographic factors. Baby boomers’ perception of risk and sociocognitive determinates that impact their decision to practice safe sex was examined using a correlational study design. A hierarchical multiple linear regression (HMLR) model from 48 participants aged 50–70 living in the South revealed that level of education, acquired immune deficiency syndrome (AIDS) prevention behavioral skills, and HIV prevention information predicted the intent to practice safe sex. Findings account for 58.3% of the total amount of the variance explained by the two model predictors. The results are consistent with findings in the literature that suggest older adults who have more HIV prevention information and behavioral skills are more inclined to practice safe sex. © 2016 Taylor & Francis. Source


Pyatt K.,Eastern Washington University | Sims R.,Capella University
Journal of Science Education and Technology | Year: 2012

This study investigated the learning dimensions that occur in physical and virtual inquiry-based lab investigations, in first-year secondary chemistry classes. This study took place over a 2 year period and utilized an experimental crossover design which consisted of two separate trials of laboratory investigation. Assessment data and attitudinal data were gathered and analyzed to measure the instructional value of physical and virtual lab experiences in terms of student performance and attitudes. Test statistics were conducted for differences of means for assessment data. Student attitudes towards virtual experiences in comparison to physical lab experiences were measured using a newly created Virtual and Physical Experimentation Questionnaire (VPEQ). VPEQ was specifically developed for this study, and included new scales of Usefulness of Lab, and Equipment Usability which measured attitudinal dimensions in virtual and physical lab experiences. A factor analysis was conducted for questionnaire data, and reliability of the scales and internal consistency of items within scales were calculated. The new scales were statistically valid and reliable. The instructional value of physical and virtual lab experiences was comparable in terms of student performance. Students showed preference towards the virtual medium in their lab experiences. Students showed positive attitudes towards physical and virtual experiences, and demonstrated a preference towards inquiry-based experiences, physical or virtual. Students found virtual experiences to have higher equipment usability as well as a higher degree of open-endedness. In regards to student access to inquiry-based lab experiences, virtual and online alternatives were viewed favorably by students. © 2011 Springer Science+Business Media, LLC. Source

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