University of Maine

About: University of Maine is a education organization based out in Orono, Maine, United States. It is known for research contribution in the topics: Population & Ice sheet. The organization has 8637 authors who have published 16932 publications receiving 590124 citations. The organization is also known as: University of Maine at Orono.

Batrachochytrium dendrobatidis gen. et sp. nov., a chytrid pathogenic to amphibians

Abstract: Captive and wild frogs from North and Central America and Australia recently have died with epidermal infections by chytridiomycete fungi. We isolated a chytridiomycete into pure culture from a captive, blue poison dart frog that died at the Na- tional Zoological Park in Washington, D.C. Using this isolate, we photographed developmental stages on nutrient agar, examined zoospores with transmission electron microscopy, and inoculated test frogs. This inoperculate chytrid develops either monocentrically or colonially and has thread-like rhizoids that arise from single or multiple areas on the developing zoo- sporangium. The taxonomically important features of the kinetosomal region of the zoospore indicate that this chytrid is a member of the Chytridiales but differs from other chytrids studied with transmission electron microscopy. Its microtubule root, which be- gins at kinetosome triplets 9-1 and extends parallel to the kinetosome into the aggregation of ribosomes, is distinctive. Histologic examination of test frogs re- vealed that the pure culture infected the skin of test frogs, whereas the skin of control frogs remained free of infection. The fungus is described as Batrachochy-

Teachers' Sense of Efficacy and Commitment to Teaching

Abstract: The present study examined the degree to which teachers' sense of efficacy, as well as other hypothesized influences on commitment to teaching, predicted 170 teachers' responses to the question, “Suppose you had it to do all over again: In view of your present knowledge, would you become a teacher?” General and personal efficacy emerged as the two strongest predictors of teaching commitment, along with teacher-student ratio, school climate, and sex. In short, greater teaching commitment tended to be expressed by those teachers who were higher in both general and personal efficacy; who taught in schools with fewer students per teacher; and who worked under a principal regarded positively in the areas of instructional leadership, school advocacy, decision making, and relations with students and staff. Teaching commitment also was higher for female teachers.

Gender-based Barriers to Senior Management Positions: Understanding the Scarcity of Female CEOs

Abstract: Although the number of women in middle management has grown quite rapidly in the last two decades, the number of female CEOs in large corporations remains extremely low. This article examines many explanations for why women have not risen to the top, including lack of line experience, inadequate career opportunities, gender differences in linguistic styles and socialization, gender-based stereotypes, the old boy network at the top, and tokenism. Alternative explanations are also presented and analyzed, such as differences between female leadership styles and the type of leadership style expected at the top of organizations, feminist explanations for the underrepresentation of women in top management positions, and the possibility that the most talented women in business often avoid corporate life in favor of entrepreneurial careers.