Supporting Pre-Service Teachers in Becoming Reflective Practitioners Using Conversation and Professional Standards

A significant goal of teacher education is to support the development of reflective practitioners. This intention, however, is not easily achieved when after-the-fact recall and reporting are key features of pre-service teacher learning rather than critique and contemplation. This research reports on a small-scale pilot study evaluating a novel approach to help pre-service teachers develop reflective skills in order to both understand and address the requirements of the profession. The approach involved a set of Conversation Cards with a series of question-based prompts directly linked to the APSTs and designed to enhance reflective conversations. Focus group interview discussions unveiled the surprising ways in which the pre-service teachers used the question prompts, not only as tools for reflection but for planning lessons and preparing for professional discussions with mentors. This research provides insight into a creative and meaningful approach for integrating reflection, professional standards and classroom practice through professional experience

EST and microarray analysis of horn development in Onthophagus beetles

<p>Abstract</p> <p>Background</p> <p>The origin of novel traits and their subsequent diversification represent central themes in evo-devo and evolutionary ecology. Here we explore the genetic and genomic basis of a class of traits that is both novel and highly diverse, in a group of organisms that is ecologically complex and experimentally tractable: horned beetles.</p> <p>Results</p> <p>We developed two high quality, normalized cDNA libraries for larval and pupal <it>Onthophagus taurus </it>and sequenced 3,488 ESTs that assembled into 451 contigs and 2,330 singletons. We present the annotation and a comparative analysis of the conservation of the sequences. Microarrays developed from the combined libraries were then used to contrast the transcriptome of developing primordia of head horns, prothoracic horns, and legs. Our experiments identify a first comprehensive list of candidate genes for the evolution and diversification of beetle horns. We find that developing horns and legs show many similarities as well as important differences in their transcription profiles, suggesting that the origin of horns was mediated partly, but not entirely, by the recruitment of genes involved in the formation of more traditional appendages such as legs. Furthermore, we find that horns developing from the head and prothorax differ in their transcription profiles to a degree that suggests that head and prothoracic horns are not serial homologs, but instead may have evolved independently from each other.</p> <p>Conclusion</p> <p>We have laid the foundation for a systematic analysis of the genetic basis of horned beetle development and diversification with the potential to contribute significantly to several major frontiers in evolutionary developmental biology.</p

Origins and Consequences of Serpentine Endemism in the California Flora

Habitat specialization plays an important role in the creation and loss of biodiversity over ecological and evolutionary time scales. In California, serpentine soils have a distinctive flora, with 246 serpentine habitat specialists (i.e., endemics). Using molecular phylogenies for 23 genera containing 784 taxa and 51 endemics, we infer few transitions out of the endemic state, which is shown by an analysis of transition rates to simply reflect the low frequency of endemics (i.e., reversal rates were high). The finding of high reversal rates, but a low number of reversals, is consistent with the widely hypothesized trade-off between serpentine tolerance and competitive ability, under which serpentine endemics are physiologically capable of growing in less-stressful habitats but competitors lead to their extirpation. Endemism is also characterized by a decrease in speciation and extinction rates and a decrease in the overall diversification rate. We also find that tolerators (species with nonserpentine and serpentine populations) undergo speciation in serpentine habitats to give rise to new serpentine endemics but are several times more likely to lose serpentine populations to produce serpentine-intolerant taxa. Finally, endemics were younger on average than nonendemics, but this alone does not explain their low diversification

Terahertz hot electron bolometer waveguide mixers for GREAT

Supplementing the publications based on the first-light observations with the German Receiver for Astronomy at Terahertz frequencies (GREAT) on SOFIA, we present background information on the underlying heterodyne detector technology. We describe the superconducting hot electron bolometer (HEB) detectors that are used as frequency mixers in the L1 (1400 GHz), L2 (1900 GHz), and M (2500 GHz) channels of GREAT. Measured performance of the detectors is presented and background information on their operation in GREAT is given. Our mixer units are waveguide-based and couple to free-space radiation via a feedhorn antenna. The HEB mixers are designed, fabricated, characterized, and flight-qualified in-house. We are able to use the full intermediate frequency bandwidth of the mixers using silicon-germanium multi-octave cryogenic low-noise amplifiers with very low input return loss. Superconducting HEB mixers have proven to be practical and sensitive detectors for high-resolution THz frequency spectroscopy on SOFIA. We show that our niobium-titanium-nitride (NbTiN) material HEBs on silicon nitride (SiN) membrane substrates have an intermediate frequency (IF) noise roll-off frequency above 2.8 GHz, which does not limit the current receiver IF bandwidth. Our mixer technology development efforts culminate in the first successful operation of a waveguide-based HEB mixer at 2.5 THz and deployment for radioastronomy. A significant contribution to the success of GREAT is made by technological development, thorough characterization and performance optimization of the mixer and its IF interface for receiver operation on SOFIA. In particular, the development of an optimized mixer IF interface contributes to the low passband ripple and excellent stability, which GREAT demonstrated during its initial successful astronomical observation runs.Comment: Accepted for publication in A&A (SOFIA/GREAT special issue

The Development of the Stereotypical Attitudes in HPE Scale

This study reflects that teacher education in Health and Physical Education (HPE) has long grappled with the challenge of how to disrupt pre-service teachers’ (PSTs) established attitudes about HPE that may limit their capacity to positively engage with a diverse student population. This paper describes the development, validation and interpretation of the Stereotypical Attitudes in Health and Physical Education scale (SAHPE) for use in teacher education institutions. The scale was developed as a means of exploring the extent to which PSTs perpetuate or reject discriminatory attitudes and stereotypes that have been identified as having some historical and cultural acceptance in Health and Physical Education. It was designed as a tool to generate data that can be used by teacher educators with PSTs to better understand and problematise stereotypical attitudes that ultimately impact diversity and inclusion in HPE classrooms. This paper details the design process and pilot research that enabled validation of the scale for use by Australian teacher educators. For the purposes of validation, the SAHPE scale was administered to 109 pre-service teachers at one Australian university. Rasch modelling and confirmatory factor analysis using AMOS version 20.0 was employed to determine the measurement properties of the instrument and the construct validity of factors. Results from the study showed that a 17-item factor structure of the SAHPE is a valid and reliable predictor of a construct related to stereotypical attitudes. The discussion addresses the future application of the SAHPE as an instrument for teacher educators to use in efforts to enhance inclusion in HPE

Aquilegia, Vol. 26 No. 4, July-August 2002: Newsletter of the Colorado Native Plant Society

https://epublications.regis.edu/aquilegia/1094/thumbnail.jp

Gene discovery in the horned beetle Onthophagus taurus

<p>Abstract</p> <p>Background</p> <p>Horned beetles, in particular in the genus <it>Onthophagus</it>, are important models for studies on sexual selection, biological radiations, the origin of novel traits, developmental plasticity, biocontrol, conservation, and forensic biology. Despite their growing prominence as models for studying both basic and applied questions in biology, little genomic or transcriptomic data are available for this genus. We used massively parallel pyrosequencing (Roche 454-FLX platform) to produce a comprehensive EST dataset for the horned beetle <it>Onthophagus taurus</it>. To maximize sequence diversity, we pooled RNA extracted from a normalized library encompassing diverse developmental stages and both sexes.</p> <p>Results</p> <p>We used 454 pyrosequencing to sequence ESTs from all post-embryonic stages of <it>O. taurus. </it>Approximately 1.36 million reads assembled into 50,080 non-redundant sequences encompassing a total of 26.5 Mbp. The non-redundant sequences match over half of the genes in <it>Tribolium castaneum</it>, the most closely related species with a sequenced genome. Analyses of Gene Ontology annotations and biochemical pathways indicate that the <it>O. taurus </it>sequences reflect a wide and representative sampling of biological functions and biochemical processes. An analysis of sequence polymorphisms revealed that SNP frequency was negatively related to overall expression level and the number of tissue types in which a given gene is expressed. The most variable genes were enriched for a limited number of GO annotations whereas the least variable genes were enriched for a wide range of GO terms directly related to fitness.</p> <p>Conclusions</p> <p>This study provides the first large-scale EST database for horned beetles, a much-needed resource for advancing the study of these organisms. Furthermore, we identified instances of gene duplications and alternative splicing, useful for future study of gene regulation, and a large number of SNP markers that could be used in population-genetic studies of <it>O. taurus </it>and possibly other horned beetles.</p

Evaluating Alternative Feed Sources During Drought

During years of drought, it is important to critically evaluate alternative feed sources available for cattle. The traditional method for sustaining a herd through a drought is feeding extra stored forage to compensate for decreased forage production or decreased forage quality available on rangelands and pastures due to drought conditions. However, hay prices rise substantially, and availability decreases due to irrigation water limitations and increased demand from livestock producers. This fact sheet will evaluate why hay prices rise and what alternatives are available to compensate for forage reductions during drought