602 research outputs found
A Middle School Strives to Achieve Team Leadership Through Opposition and Uncertainty
Learning to Lead Together: The Promise and Challenge of Sharing Leadership examines the dilemmas for school leaders and administrators, and the benefits for schools and students, when principals work with teachers (and their communities) to share leadership. Most schools function within existing hierarchical structures that contradict and undermine many of the conditions necessary for shared leadership. Current school reform initiatives and policies urge or require that teachers be actively involved in decision-making without addressing systemic dilemmas and paradoxes. Through real-life single and multiple case studies, Learning to Lead Together addresses how principals and their staffs struggle with the challenge of shared leadership, how they encourage teacher growth and development, and how shared leadership can lead to higher levels of student learning. The cases show how shared leadership, a powerful adaptive change, is socially constructed across contexts and evolves as teachers and principals learn how to work together. The book also illustrates how principal preparation and professional development programs that utilize problem-based learning and provide opportunities for genuine collaboration with colleagues can provide school leaders with the skills they need to share leadership and accountability effectivel
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The expression pattern of the tonoplast intrinsic protein γ-TIP in Arabidopsis thaliana Is correlated with cell enlargement
The vacuolar membrane (tonoplast) contains an abundant intrinsic protein with six membrane-spanning domains that is encoded by a small gene family. Different isoforms of tonoplast intrinsic protein (TIP) are expressed in different tissues or as a result of specific signals. Using promoter-beta-glucuronidase (GUS) fusions and in situ hybridization, we have examined the expression of gamma-TIP in Arabidopsis thaliana. GUS staining of plants transformed with promoter-GUS fusions showed that gamma-TIP gene expression is high in recently formed tissues of young roots. In the shoot, gamma-TIP gene expression was highest in the vascular bundles of stems and petioles, as well as in the stipules and in the receptacle of the flower. No GUS activity was detected in root or shoot meristems or in older tissues, suggesting temporal control of gamma-TIP gene expression associated with cell elongation and/or differentiation. In situ hybridization carried out with whole seedlings confirmed that in root tips, gamma-TIP mRNA was present only in the zone of cell elongation just behind the apical meristem. In seedling shoots, mRNA abundance was also found to be correlated with cell expansion. These results indicate that gamma-TIP may be expressed primarily at the time when the large central vacuoles are being formed during cell enlargement.Supported by a grant from the United States Department of Agriculture (to M.J.C.), a European Molecular Biology Organization fellowship (to H.H.), and a fellowship from the Provincial Government of Catalonia (to D.L.).Peer reviewe
Protective Mechanism of the Mexican Bean Weevil against High Levels of [alpha]-Amylase Inhibitor in the Common Bean
cDNA cloning of carrot extracellular beta-fructosidase and its expression in response to wounding and bacterial infection.
Activation of Bean (Phaseolus vulgaris) [alpha]-Amylase Inhibitor Requires Proteolytic Processing of the Proprotein
The Major Intrinsic Protein Family of Arabidopsis Has 23 Members That Form Three Distinct Groups with Functional Aquaporins in Each Group
Isolation of a Mutant Arabidopsis Plant That Lacks N-Acetyl Glucosaminyl Transferase I and Is Unable to Synthesize Golgi-Modified Complex N-Linked Glycans
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