Freeze-cast Fe-25 W (at%) lamellar foams show excellent resistance to degradation at 800 °C during steam-hydrogen redox cycling between the metallic and oxide states, with fast reaction kinetics maintained up to at least 100 redox cycles with full Fe utilization. This very high stability stems from the sintering inhibition of W combined with the freeze-cast architecture and the chemical vapor transport (CVT) mechanism of reduction. These three factors create a hierarchical porosity in the foam, consisting of i) macroscopic elongated channels, ii) micro-scale sintering inhibition pores, and iii) submicron CVT pores.
View Article and Find Full Text PDFObjective: To explore the knowledge, attitudes, and practices regarding COVID-19 in university affiliates to inform future COVID-19 policies and practices.
Participants: Undergraduate students, graduate students and university employees at a large public university.
Methods: Semi-structured focus groups and interviews were conducted between December 2020 and January 2021.
Background: SAMHD1 is a deoxynucleotide triphosphohydrolase that restricts replication of HIV-1 in differentiated leucocytes. HIV-1 is not restricted in cycling cells and it has been proposed that this is due to phosphorylation of SAMHD1 at T592 in these cells inactivating the enzymatic activity. To distinguish between theories for how SAMHD1 restricts HIV-1 in differentiated but not cycling cells, we analysed the effects of substitutions at T592 on restriction and dNTP levels in both cycling and differentiated cells as well as tetramer stability and enzymatic activity in vitro.
View Article and Find Full Text PDFObjective: To better understand the potential ongoing effects of the COVID-19 pandemic on U.S. university students' mental health and to generate hypotheses as to how universities may best meet students' mental health needs.
View Article and Find Full Text PDFAcademic mothers (including nonbinary, trans, and genderqueer parents) have always faced challenges in their profession due to systemic barriers and a "motherhood tax"; however, COVID-19 has exacerbated already existing inequalities (Oleschuk, 2020). This study examines how the pandemic has affected academic mothers with mental health and physical disabilities, as these voices often remain hidden and unheard in academia despite increased awareness of their presence (Brown & Leigh, 2018; Kelly & Senior, 2020). Here, we share the voices of 23 participants using a qualitative methodology drawing from social justice and feminist theories to highlight the lived experience of academic mothers with mental and/or physical disabilities and their experiences as a scholar and parent during COVID-19.
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