Ferromagnetic ordering in dilute magnetic dielectrics with and without free carriers

The state of art in the theoretical and experimental studies of transition metal doped oxides (dilute magnetic dielectrics) is reviewed. The available data show that the generic non-equilibrium state of oxide films doped with magnetic impurities may either favor ferromagnetism with high Curie temperature or result in highly inhomogeneous state without long-range magnetic order. In both case concomitant defects (vacancies, interstitial ions play crucial part.Comment: 10 pages, 3 figures. The paper was presented at the Moscow Internation Symposium on Magnetism (MISM-08). To be published in Journ. Magnetism and Magnetic Material

On the feasibility of N2 fixation via a single-site FeI/FeIV cycle: Spectroscopic studies of FeI(N2)FeI, FeIV=N, and related species

The electronic properties of an unusually redox-rich iron system, [PhBPR 3]FeNx (where [PhBPR 3] is [PhB(CH2PR2)3]−), are explored by Mössbauer, EPR, magnetization, and density-functional methods to gain a detailed picture regarding their oxidation states and electronic structures. The complexes of primary interest in this article are the two terminal iron(IV) nitride species, [PhBPiPr 3]FeN (3a) and [PhBPCH2Cy 3]FeN (3b), and the formally diiron(I) bridged-Fe(μ-N2)Fe species, {[PhBPiPr 3]Fe}2(μ-N2) (4). Complex 4 is chemically related to 3a via a spontaneous nitride coupling reaction. The diamagnetic iron(IV) nitrides 3a and 3b exhibit unique electronic environments that are reflected in their unusual Mössbauer parameters, including quadrupole-splitting values of 6.01(1) mm/s and isomer shift values of −0.34(1) mm/s. The data for 4 suggest that this complex can be described by a weak ferromagnetic interaction (J/D < 1) between two iron(I) centers. For comparison, four other relevant complexes also are characterized: a diamagnetic iron(IV) trihydride [PhBPiPr 3]Fe(H)3(PMe3) (5), an S = 3/2 iron(I) phosphine adduct [PhBPiPr 3]FePMe3 (6), and the S = 2 iron(II) precursors to 3a, [PhBPiPr 3]FeCl and [PhBPiPr 3]Fe-2,3:5,6-dibenzo-7-aza bicyclo[2.2.1]hepta-2,5-diene (dbabh). The electronic properties of these respective complexes also have been explored by density-functional methods to help corroborate our spectral assignments and to probe their electronic structures further

River Restoration to Achieve a Stage 0 Condition: Summary of a Workshop Held November 5-6, 2020

Restoration to achieve Stage 0 is a valley-scale, process-based (hydrologic, geologic and biological) approach that aims to reestablish stream depositional environments to maximize longitudinal, lateral, and vertical connectivity at base flows and facilitate development of dynamic, self-formed and self-sustaining wetland-stream complexes. The term Stage 0 originally described complex multi-channel conditions and wider floodplains that evidence suggests were common when Euro-Americans arrived. Stage 0 is one stage in a 9-stage stream channel evolution model. Stage 0 is now also more broadly used to describe stream restoration projects aimed at changing the current condition and future evolution of incised, single-channel streams to achieve those multi-channel and wider floodplain conditions. The Stage 0 approach has generated excitement among restoration practitioners and researchers. It is seen as an action on a scale commensurate with past impacts; potentially capable of putting streams and their floodplains on a trajectory to recovery that is sustainable with minimal future intervention. Projects that reset the valley surface elevation may include the transfer of large amounts of sediment into incised channels from adjacent terraces using heavy machinery, and placement of logs and boulders to create structure across the resulting floodplain. Recreating expanded, complex and resilient stream and floodplain habitats over the longer term may involve considerable short-term disturbance of existing stream environments. Because some of these streams currently support sensitive populations of focal or endangered species (most notably salmonids) projects designed to achieve a Stage 0 condition have raised some questions and concerns among land managers and regulators charged with recovering those species. The approach is relatively new, so there are also questions regarding terminology, implementation and monitoring approaches, and appropriate sites and scale for these projects. In this science and policy context, a Stage 0 Stream Restoration Workshop was held on November 5-6, 2020 with the goal to bring together practitioners, researchers, regulators and other stakeholders to discuss current topics and data gaps related to implementing and monitoring restoration projects intended to achieve a Stage 0 condition. The online workshop included expert presentations, questions and discussions during plenary sessions, and smaller breakout groups. This document summarizes the workshop proceedings

A Symposium to Mark the Publication, by New York University Press, of Ian O’Donnell’s Prison Life: Pain, Resistance, and Purpose

Recognizing the major scholarly contributions to criminology by the noted Irish criminologist, Ian O’Donnell, The Prison Journal invited seven contemporary corrections and punishment scholars to offer insights into O’Donnell’s new book, Prison Life: Pain, Resistance, and Purpose. Offering contextually rich descriptions of prisoner life, the text features four case study prisons—H Blocks, Northern Ireland; Eastham Unit, Texas; Isir Bet, Ethiopia; and ADX Florence, Colorado, in pivotal time periods and through an individual\u27s custodial career in each institution. The symposium discussants focus on O’Donnell\u27s conceptual framework—the degree of prison integration, system and staff regulation, and legitimacy—and how these reflect the key interactions between punishment and society across time and culture

A gene signature for post-infectious chronic fatigue syndrome

Background: At present, there are no clinically reliable disease markers for chronic fatigue syndrome. DNA chip microarray technology provides a method for examining the differential expression of mRNA from a large number of genes. Our hypothesis was that a gene expression signature, generated by microarray assays, could help identify genes which are dysregulated in patients with post-infectious CFS and so help identify biomarkers for the condition. Methods: Human genome-wide Affymetrix GeneChip arrays (39,000 transcripts derived from 33,000 gene sequences) were used to compare the levels of gene expression in the peripheral blood mononuclear cells of male patients with post-infectious chronic fatigue (n = 8) and male healthy control subjects (n = 7). Results: Patients and healthy subjects differed significantly in the level of expression of 366 genes. Analysis of the differentially expressed genes indicated functional implications in immune modulation, oxidative stress and apoptosis. Prototype biomarkers were identified on the basis of differential levels of gene expression and possible biological significance Conclusion: Differential expression of key genes identified in this study offer an insight into the possible mechanism of chronic fatigue following infection. The representative biomarkers identified in this research appear promising as potential biomarkers for diagnosis and treatment

Proceedings of the 3rd BEAT-PCD Conference and 4th PCD Training School

Abstract Primary ciliary dyskinesia (PCD) is a chronic suppurative airways disease that is usually recessively inherited and has marked clinical phenotypic heterogeneity. Classic symptoms include neonatal respiratory distress, chronic rhinitis since early childhood, chronic otitis media, recurrent airway infections leading to bronchiectasis, chronic sinusitis, laterality defects with and without congenital heart disease including abnormal situs in approximately 50% of the cases, and male infertility. Lung function deteriorates progressively from childhood throughout life. ‘Better Experimental Approaches to Treat Primary Ciliary Dyskinesia’ (BEAT-PCD) is a network of scientists and clinicians coordinating research from basic science through to clinical care with the intention of developing treatments and diagnostics that lead to improved long-term outcomes for patients. BEAT-PCD activities are supported by EU funded COST Action (BM1407). The third BEAT-PCD conference and fourth PCD training school were held jointly in February 2018 in Lisbon, Portugal. Presentations and workshops focussed on advancing the knowledge and skills relating to PCD in: basic science, epidemiology, diagnostic testing, clinical management and clinical trials. The multidisciplinary conference provided an interactive platform for exchanging ideas through a program of lectures, poster presentations, breakout sessions and workshops. Three working groups met to plan consensus statements. Progress with BEAT-PCD projects was shared and new collaborations were fostered. In this report, we summarize the meeting, highlighting developments made during the meeting