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10 result(s) for "Browning, Larry M."
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Building Resilience in Rural STEM Teachers Through a Noyce Professional Learning Community
Addressing the critical STEM teachers’ shortage in the rural United States requires not only recruiting new teachers but also improving retention and teacher resiliency. This study explores contextual protective factors through the Early Career Teacher Resilience (ECTR) framework. The major objective of this study was to evaluate the impacts of the NSF Noyce Professional Learning Community (PLC) on rural STEM teacher resilience. Key components of the Noyce PLC included scholarship support, pre-service mentoring, attendance at local and regional educational events, active engagement in the program’s annual summer conference, and participation in a closed Facebook group. We developed an ECTR framework-based online instrument with 28 questions and sent it to 311 university alumni, including 44 Noyce alumni. The results suggest that the Noyce PLC has excelled in fostering collaborative learning environments, providing resources that enhance teaching and learning, accommodating new and different ways of thinking, and supporting teachers’ professional growth beyond graduation. The findings underscore the importance of integrating theoretical and practical knowledge, supporting ongoing professional learning, and building strong professional relationships. Several aspects of the Noyce PLC could be replicated in other STEM teacher preparation programs to enhance teacher resilience, effectiveness, and career development.
BIOGEOGRAPHY OF MENTZELIA THOMPSONII AND RELATED SPECIES (LOASACEAE)
AbstractMentzelia thompsonii is the only species in Mentzelia section Trachyphytum endemic to the Colorado Plateau and one of only a few that do not occur in California. In order to investigate the geographic origins, ecological function, and evolutionary potential of M. thompsonii and related species, we combine evidence from DNA, soil chemistry, and environmental niche modeling in a phylogenetic context. Based on ndhF–rpl32 cpDNA sequences from 185 specimens of M. thompsonii and 42 specimens representing the remaining 21 species in section Trachyphytum, we found that M. thompsonii is monophyletic and phylogenetically isolated from other species in Trachyphytum, suggesting that it is a paleoendemic. In contrast, the South American species, M. solierii, was placed sister to a haplotype from M. packardiae, representing the first published phylogenetic investigation of M. solierii. Soil analyses from all North American species in section Trachyphytum show that the edaphic niche of M. thompsonii is significantly different, and niche modeling with MaxEnt found that the distribution of Mancos Shale outcrops was five times more important than the most important climate variable for predicting the distribution of M. thompsonii. Surprisingly, subrange haplotype diversity in M. thompsonii did not match niche projections of climatic refugia during the last glacial maximum. Instead, diversity was lowest in the southernmost subrange and highest in the northernmost subrange of M. thompsonii. However, haplotype diversity was congruent with the projected distribution of M. thompsonii in 2081–2100, suggesting that genetic diversity in M. thompsonii has been shaped more by rapid warming and drought during interglacial periods than by the gradual cooling leading into glacial periods.
Growth and sporulation of Phytophthora ramorum in vitro in response to temperature and light
Phytophthora ramorum, recently found in the US, is causing concern for hardwood forests and the nursery industry. In an effort to identify some of the environmental limitations to growth and sporulation we undertook a laboratory study of four US and three European (EU) isolates. On V8 media, isolates grew when incubated at 2-28 C and produced chlamydospores at 8-28 C. Sporangia were produced at all temperatures tested: 10-30 C for US isolates and 6-26 C for EU isolates. Optimal temperatures were 16-26 C for growth, 14-26 C for chlamydospore production and 16-22 C for sporangia production. US isolates grew less and produced fewer spores when exposed to increasing doses of near-UV radiation (50-300 μW/cm 2 ) and visible radiation (250-1500 μW/cm 2 ). EU isolates were exposed to 300 μW/cm 2 near-UV only, which significantly reduced growth of one of three isolates and had no significant effect on spore production. In our studies P. ramorum tolerated a broad range of temperature and light conditions, which suggests that it is capable of establishment in a wide geographic area.
Growth and sporulation of Phytophthora ramorum in vitro in response to temperature and light
Phytophthora ramorum, recently found in the US, is causing concern for hardwood forests and the nursery industry. In an effort to identify some of the environmental limitations to growth and sporulation we undertook a laboratory study of four US and three European (EU) isolates. On V8 media, isolates grew when incubated at 2-28 C and produced chlamydospores at 8-28 C. Sporangia were produced at all temperatures tested: 10-30 C for US isolates and 6-26 C for EU isolates. Optimal temperatures were 16-26 C for growth, 14-26 C for chlamydospore production and 16-22 C for sporangia production. US isolates grew less and produced fewer spores when exposed to increasing doses of near-UV radiation (50-300 microW/cm(2)) and visible radiation (250-1500 microW/cm(2)). EU isolates were exposed to 300 microW/cm(2) near-UV only, which significantly reduced growth of one of three isolates and had no significant effect on spore production. In our studies P. ramorum tolerated a broad range of temperature and light conditions, which suggests that it is capable of establishment in a wide geographic area.Phytophthora ramorum, recently found in the US, is causing concern for hardwood forests and the nursery industry. In an effort to identify some of the environmental limitations to growth and sporulation we undertook a laboratory study of four US and three European (EU) isolates. On V8 media, isolates grew when incubated at 2-28 C and produced chlamydospores at 8-28 C. Sporangia were produced at all temperatures tested: 10-30 C for US isolates and 6-26 C for EU isolates. Optimal temperatures were 16-26 C for growth, 14-26 C for chlamydospore production and 16-22 C for sporangia production. US isolates grew less and produced fewer spores when exposed to increasing doses of near-UV radiation (50-300 microW/cm(2)) and visible radiation (250-1500 microW/cm(2)). EU isolates were exposed to 300 microW/cm(2) near-UV only, which significantly reduced growth of one of three isolates and had no significant effect on spore production. In our studies P. ramorum tolerated a broad range of temperature and light conditions, which suggests that it is capable of establishment in a wide geographic area.
Survival of Phytophthora ramorum hyphae after exposure to temperature extremes and various humidities
We examined the effect of short-term exposure to high and low temperatures and a range of relative humidity (RH) on survival of Phytophthora ramorum hyphae. Spore-free hyphal colonies were grown on dialysis squares atop V8 medium. Colonies were transferred to water agar plates positioned at 27.5-50 C on a thermal gradient plate and incubated 2.5- 480 min. For low temperature trials colonies were transferred to vials of distilled water and incubated in a water bath at -5 to -25 C for 1-24 h. In the relative humidity trials hyphal colonies were transferred to sealed humidity chambers containing various concentrations of glycerin for 1-8 h. Relative humidity was 41-93% at 20 C and 43-86% at 28 C. Survival in all trials was characterized by growth from dialysis squares into V8 medium. Temperatures of 37.5-40 C were lethal to P. ramorum hyphae within several hours, and temperatures of 42.5-50 C were lethal within minutes. Exposure to 32.5 and 35 C resulted in reduced survival over 8 h, while 30 C had no effect on three of four isolates. Hyphal colonies demonstrated considerable tolerance to cold, with all isolates surviving a 24 h exposure to -5 C. Survival diminished over time at lower temperatures, however a few colonies survived 24 h exposure to -25 C. Temperature also affected the ability of hyphal colonies to withstand reduced humidity. A RH of 41-43% was lethal in 2 h at 28 C compared to 8 h at 20 C. Three of four isolates were unaffected by an 8 h exposure to 81 and 95% RH at 20 C, and 73 and 86% RH at 28 C. Isolate differences were apparent in tolerance to freezing temperatures and reduced humidity. From these results it is apparent that the cold temperatures found in the northeastern USA are not likely to prevent the establishment of P. ramorum. There is also the potential for hyphae, and presumably spores, to survive periods of high humidity on the leaf surface in the absence of free water.
Survival of Phytophthora ramorum hyphae after exposure to temperature extremes and various humidities
We examined the effect of short-term exposure to high and low temperatures and a range of relative humidity (RH) on survival of Phytophthora ramorum hyphae. Spore-free hyphal colonies were grown on dialysis squares atop V8 medium. Colonies were transferred to water agar plates positioned at 27.5-50 C on a thermal gradient plate and incubated 2.5-480 min. For low temperature trials colonies were transferred to vials of distilled water and incubated in a water bath at −5 to −25 C for 1-24 h. In the relative humidity trials hyphal colonies were transferred to sealed humidity chambers containing various concentrations of glycerin for 1-8 h. Relative humidity was 41-93% at 20 C and 43-86% at 28 C. Survival in all trials was characterized by growth from dialysis squares into V8 medium. Temperatures of 37.5-40 C were lethal to P. ramorum hyphae within several hours, and temperatures of 42.5-50 C were lethal within minutes. Exposure to 32.5 and 35 C resulted in reduced survival over 8 h, while 30 C had no effect on three of four isolates. Hyphal colonies demonstrated considerable tolerance to cold, with all isolates surviving a 24 h exposure to −5 C. Survival diminished over time at lower temperatures, however a few colonies survived 24 h exposure to −25 C. Temperature also affected the ability of hyphal colonies to withstand reduced humidity. A RH of 41-43% was lethal in 2 h at 28 C compared to 8 h at 20 C. Three of four isolates were unaffected by an 8 h exposure to 81 and 95% RH at 20 C, and 73 and 86% RH at 28 C. Isolate differences were apparent in tolerance to freezing temperatures and reduced humidity. From these results it is apparent that the cold temperatures found in the northeastern USA are not likely to prevent the establishment of P. ramorum. There is also the potential for hyphae, and presumably spores, to survive periods of high humidity on the leaf surface in the absence of free water.
Impression management and the use of procedures at the Ritz-Carlton: Moral standards and dramaturgical discipline
This article uses Goffman's work on moral standards and dramaturgical discipline to inform a case study featuring a hotel's procedures for guaranteeing reliable impression management. Through an analysis of archival material and 18 interviews at two sites, we developed four categories of impression management behaviors. Viewing our analysis through Goffman's lens, we argue that procedures codify moral standards thereby offering employees specific means by which they can enact dramaturgical discipline. In our discussion we suggest several ways in which our case study reinforces and expands Goffman's original concepts. Our findings are (a) procedures can function as codified moral standards within the organizational setting, (b) procedures can serve as the basis for employee enactment of dramaturgical discipline, (c) the use of databases in collecting and storing information offers a new wrinkle to impression management theory, and (d) the use of incentives to pacify guests expands the defensive practices available to those engaging in impression management.
Building cooperation in a competitive industry: SEMATECH and
The results are presented of a grounded theory analysis of observation, review, and archival data collected at SEMATECH, a research, development, and testing consortium in the semiconductor manufacturing industry. Three core categories of events and behaviors are described: 1. the factors underlying the consortium's early disorder and ambiguity, 2. the development of a moral community in which individuals and firms made contributions to the industry without regard for immediate and specific payback, and 3. the structuring that emerged from changing practices and norms as consortium founders and others devised ways to foster cooperation. The results are interpreted in terms of complexity theory, a framework for understanding change that has not been previously explored with detailed empirical data from organizations.
La dialectique entre listes et récits au sein des organisations
La communication dans les organisations recourt massivement à des listes (plans d'action, « bullet points » sur des transparents, etc.). Cet article compare les mérites et les limites des listes, d'une part et des récits, d'autre part. Il propose un modèle du passage d'un format à l'autre et applique cette grille de lecture à un outil de gestion actuellement très utilisé, le tableau de bord équilibré. Communication inside organizations refers to bulky lists (programmes of action “bullet points” on transperancies etc.) The article compares the limits and merits on the one hand of the lists and of the accounts on the other hand. A model for shifting from one pattern to the other is proposed and this reading list is applied to a managerial tool extensively used at present: the balanced schedule log.