Mathematics Teachers’ Use of Assessment and Instructional Strategies

U.S. middle school teachers have struggled to meet the instructional needs of students in the area of mathematics. Teachers’ approaches to assessment and instructional strategies remain understudied; such knowledge could help educational leaders to devise strategies to boost student achievement. The purpose of this qualitative study was to examine teachers’ perceptions of assessment data usage and instructional strategies used in middle school mathematics. The conceptual framework was based on Fullan et al.’s three Ps (precision, personalization, and professional learning) framework. The guiding research questions for this study concerned teachers’ perceptions of assessment usage and instructional strategies and their considerations prior to assessment and strategy implementation. This study was conducted in the basic qualitative tradition. Eight middle school mathematics teachers were recruited using criterion sampling. Individual interviews were conducted to gain insight regarding participants’ perceptions of assessment usage and instructional strategies. Thematic analysis yielded six themes regarding the adequacy of time for analyzing data results, the realization that stakeholder input enhances classroom success, the use of varied instructional strategies, the use of data to support personalized instruction and to better understand students, and the implementation of instructional duties with fidelity. This study contributes knowledge regarding mathematics teachers\u27 use of assessment data to improve instructional delivery and assessment. Study findings may inform classroom teachers\u27 professional development in assessment data usage and instructional strategies. With such knowledge, teachers may have greater agency and be better able to increase student achievement

Mathematics Teachers’ Use of Assessment and Instructional Strategies

U.S. middle school teachers have struggled to meet the instructional needs of students in the area of mathematics. Teachers’ approaches to assessment and instructional strategies remain understudied; such knowledge could help educational leaders to devise strategies to boost student achievement. The purpose of this qualitative study was to examine teachers’ perceptions of assessment data usage and instructional strategies used in middle school mathematics. The conceptual framework was based on Fullan et al.’s three Ps (precision, personalization, and professional learning) framework. The guiding research questions for this study concerned teachers’ perceptions of assessment usage and instructional strategies and their considerations prior to assessment and strategy implementation. This study was conducted in the basic qualitative tradition. Eight middle school mathematics teachers were recruited using criterion sampling. Individual interviews were conducted to gain insight regarding participants’ perceptions of assessment usage and instructional strategies. Thematic analysis yielded six themes regarding the adequacy of time for analyzing data results, the realization that stakeholder input enhances classroom success, the use of varied instructional strategies, the use of data to support personalized instruction and to better understand students, and the implementation of instructional duties with fidelity. This study contributes knowledge regarding mathematics teachers\u27 use of assessment data to improve instructional delivery and assessment. Study findings may inform classroom teachers\u27 professional development in assessment data usage and instructional strategies. With such knowledge, teachers may have greater agency and be better able to increase student achievement

Chronic toxicity and carcinogenicity testing in the Sprague–Dawley rat of a prospective insect repellent (KBR 3023) using the dermal route of exposure

Abstract The chronic toxicology and carcinogenic potential of 1-(1-methyl-propoxycarbonyl)-2-(2-hydroxyethyl)-piperidine (KBR 3023), a prospective new insect repellent intended for human use, was studied in rats using the dermal route of application. Relying upon the toxicology profile that emerged in the subchronic rat bioassay that was conducted using dermally applied dosages of 0, 80, 200, 500 and 1000 mg KBR 3023/kg body wt/day, it was determined, in concert with the Environmental Protection Agency (EPA), that dermally applied dosages of 0, 50, 100 or 200 mg KBR 3023/kg body wt/day would be used in the conduction of all definitive forms of subchronic, chronic, and lifetime descriptive testing performed with the chemical. Using this testing approach, the specific results of this 2-year study are as follows. All in-life parameters, which included body weight, food consumption, clinical observations, survival, ophthalmology, clinical chemistry, hematology, and urinalysis, were unaffected by exposure to KBR 3023. Similarly, postmortem analyses, which included organ weights and gross pathology, were also unchanged following exposure to KBR 3023. Histopathology at the dose site/skin was characterized by a pattern of acanthosis and/or hyperkeratosis across all doses in 1-and 2-year rats. Beyond the dosing site, cystic degeneration of the liver was described in 2-year 200-mg KBR 3023/kg body wt/day males. No other compound-related non-dosing site lesion was identified at any dose tested. No evidence of a compound-induced neoplasia was suggested in this bioassay. © 1999 Elsevier Science Ireland Ltd. All rights reserved

The icephobic performance of alkyl-grafted aluminum surfaces

This work analyzes the anti-icing performance of flat aluminum surfaces coated with widely used alkyl-group based layers of octadecyltrimethoxysilane, fluorinated alkylsilane and stearic acid as they are subjected to repeated icing/deicing cycles. The wetting properties of the samples upon long-term immersion in water are also evaluated. The results demonstrate that smooth aluminum surfaces grafted with alkyl groups are prone to gradual degradation of their hydrophobic and icephobic properties, which is caused by interactions and reactions with both ice and liquid water. This implies that alkyl-group based monolayers on aluminum surfaces are not likely to be durable icephobic coatings unless their durability in contact with ice and/or water is significantly improved

The Relationship between Dioxin-Like Polychlorobiphenyls and IGF-I Serum Levels in Healthy Adults: Evidence from a Cross-Sectional Study

OBJECTIVE: Insulin-like growth factor I (IGF-I) and dioxin-like polychlorobiphenyls (DL-PCBs) have been associated with the pathogenesis of several diseases like cancer, diabetes and growth disorders. Because it has been suggested that organohalogenated contaminants could influence IGF-I levels in adults, the potential relationship between DL-PCBs and IGF-I serum levels was studied in 456 healthy adults from a representative sample of the general population of the Canary Islands (Spain). DESIGN: Free circulating serum levels of IGF-I and IGFBP-3 were measured through an ELISA methodology, while the serum levels of the 12 DL-PCBs congeners (IUPAC numbers # 77, 81, 105, 114, 118, 123, 126, 156, 157, 167, 169, and 189) were measured by gas chromatography/mass spectrometry (GC-MS). RESULTS: DL-PCBs 156 and 167, Total DL-PCBs body burden (∑PCBs: sum over the 12 measured DL-PCBs), and Total toxic burden (in terms of toxic equivalence to dioxins: ∑TEQs) showed a trend of inverse association with IGF-I serum levels in the whole studied population. After adjusting for potential confounders, including gender, body mass index (BMI), age, and IGF-binding protein-3 (IGFBP-3), younger (18-45 years) women with lower BMI (<27 kg/m(2)) and detectable levels of DL-PCB-156 showed significantly lower IGF-I levels than those in the same age and BMI subgroup with non-detectable levels of DL-PCB-156 (p<0.001). Similarly, ∑PCBs and ∑TEQs showed a tendency to an inverse association with IGF-I levels in the same group of women (p=0.017 and p=0.019 respectively). CONCLUSIONS: These findings suggest that DL-PCBs could be involved in the regulation of the IGF-system in a way possibly influenced by gender, age and BMI. Although these results should be interpreted with caution, such circumstances could contribute to explain the development of diseases associated to the IGF system

Les carrières néolithiques du Mont Viso (Piémont, Italie). Chronologie et conditions d'exploitation.: Actes du XIe Colloque sur les Alpes dans l'Antiquité, Champsec / Val de Bagnes / Valais-Suisse

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