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Light metal hydrides - Potential hydrogen storage materials
Hayley Woolf,Ian Brown,Mark Bowden 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Light metal nitride phases Li3BN2 and Mg 3BN3 have been synthesised as potential hydrogen storage materials. The formation pro-cesses using boron nitride and amorphous boron have been compared, showing that boron extracts nitrogen from the Li3N and Mg 3N2reactant phases and not from the nitrogen gas. This rate limiting solid state reaction is the rst in a three step reaction sequence to formthese ternary nitrides. The sensitivity of the reactions to low levels of impurity oxygen in the ow gas caused us to develop a closed reac-tion system methodology using nickel foil capsules.
Jules Woolf,Guangzhou Chen,Matt Haugen,Jon Welty Peachey 글로벌지식마케팅경영학회 2024 Journal of Global Sport Management Vol.9 No.1
The number of Chinese student-athletes (CSAs) at National Collegiate Athletic Association (NCAA) schools in the United States has increased dramatically in recent years. However, little is known about the distinct challenges CSAs face as they adopt the role of student and athlete, and the potential for role conflict to occur. This study explored the ways in which CSAs experienced role conflict and how they managed this conflict. Ten interviews were conducted with current or former CSAs at NCAA Division I schools. Findings revealed that CSAs experienced role conflict due to con-trasting expectations from different stakeholders, the lack of aca-demic preparedness, and unfamiliarity with the collegiate sport system. Meanwhile, CSAs managed their role conflict by realigning role expectations and shifting role identity. The findings demon-strate how role conflict can be applied to a cross-cultural context, while informing collegiate sport administrators of efforts to man-age CSAs transition into the NCAA system.
Chae Shin Lim,Allan B. Woolf 한국원예학회 2010 Horticulture, Environment, and Biotechnology Vol.51 No.6
To compare chilling responses of pepper cultivars, sweet (‘Cupra’, ‘Debla’ and ‘Ferrari’) and hot peppers (‘Buchon’, ‘Nockgwang’ and ‘Kwari’) harvested at the mature-green stage were stored at 1, 5 and 10℃ for 21 days. At 5℃, surface pitting occurred only in ‘Nockgwang’ and ‘Kwari’ cultivars suggesting that the two cultivars were more susceptible to chilling injury. At 1℃, however, all cultivars except ‘Buchon’ exhibited surface pitting after 14 days storage. The cell damage with surface depression was more severe in hot pepper than in sweet pepper cultivars at 1℃. However, chilling-tolerant ‘Buchon’ showed a depression-free appearance with no structural damage to the cells. Lower temperature induced more weight loss in all cultivars. Weight loss was higher in hot pepper than sweet pepper cultivars. Seeds turned brown in all cultivars after a 21-day storage regardless of storage temperature. More seed browning at lower temperature was observed only in ‘Cupra’ and ‘Kwari’ cultivars. During storage, hot pepper fruits showed much higher respiration than sweet pepper fruits. ‘Buchon’ produced significantly higher ethylene than others regardless of storage temperature. There was a significant difference in the response of sweet and hot peppers to storage temperature expressed as surface pitting, electrolyte leakage and weight loss.
A Gene Regulatory Network for Root Epidermis Cell Differentiation in Arabidopsis
Bruex, Angela,Kainkaryam, Raghunandan M.,Wieckowski, Yana,Kang, Yeon Hee,Bernhardt, Christine,Xia, Yang,Zheng, Xiaohua,Wang, Jean Y.,Lee, Myeong Min,Benfey, Philip,Woolf, Peter J.,Schiefelbein, John Public Library of Science 2012 PLoS genetics Vol.8 No.1
<▼1><P>The root epidermis of Arabidopsis provides an exceptional model for studying the molecular basis of cell fate and differentiation. To obtain a systems-level view of root epidermal cell differentiation, we used a genome-wide transcriptome approach to define and organize a large set of genes into a transcriptional regulatory network. Using cell fate mutants that produce only one of the two epidermal cell types, together with fluorescence-activated cell-sorting to preferentially analyze the root epidermis transcriptome, we identified 1,582 genes differentially expressed in the root-hair or non-hair cell types, including a set of 208 “core” root epidermal genes. The organization of the core genes into a network was accomplished by using 17 distinct root epidermis mutants and 2 hormone treatments to perturb the system and assess the effects on each gene's transcript accumulation. In addition, temporal gene expression information from a developmental time series dataset and predicted gene associations derived from a Bayesian modeling approach were used to aid the positioning of genes within the network. Further, a detailed functional analysis of likely bHLH regulatory genes within the network, including <I>MYC1</I>, <I>bHLH54</I>, <I>bHLH66</I>, and <I>bHLH82</I>, showed that three distinct subfamilies of bHLH proteins participate in root epidermis development in a stage-specific manner. The integration of genetic, genomic, and computational analyses provides a new view of the composition, architecture, and logic of the root epidermal transcriptional network, and it demonstrates the utility of a comprehensive systems approach for dissecting a complex regulatory network.</P></▼1><▼2><P><B>Author Summary</B></P><P>A current challenge in the field of developmental biology is to define the composition and organization of gene networks that direct the pattern and differentiation of cells, tissues, and organs. In this study, we address this problem using Arabidopsis root epidermis development, a relatively simple model for studies of cell pattern formation and differentiation in plants. We used a tissue-specific cell sorting approach to define more than 1,500 genes whose transcripts differentially accumulate in the developing root epidermis. A series of transcriptome analyses were performed with 17 root epidermal mutants and 2 plant hormone treatments to dissect the regulatory relationships between 208 core genes. In addition, gene expression information from a developmental time series dataset was used to organize genes temporally. The results provide insight into the composition, organization, and logic of a developmental gene regulatory network. Furthermore, this work demonstrates the utility of an integrated analysis in gene regulatory network construction using genetic, genomic, and computational approaches.</P></▼2>
Activity-dependent silencing reveals functionally distinct itch-generating sensory neurons
Roberson, David P,Gudes, Sagi,Sprague, Jared M,Patoski, Haley A W,Robson, Victoria K,Blasl, Felix,Duan, Bo,Oh, Seog Bae,Bean, Bruce P,Ma, Qiufu,Binshtok, Alexander M,Woolf, Clifford J Nature Publishing Group, a division of Macmillan P 2013 NATURE NEUROSCIENCE Vol.16 No.7
The peripheral terminals of primary sensory neurons detect histamine and non-histamine itch-provoking ligands through molecularly distinct transduction mechanisms. It remains unclear, however, whether these distinct pruritogens activate the same or different afferent fibers. Using a strategy of reversibly silencing specific subsets of murine pruritogen-sensitive sensory axons by targeted delivery of a charged sodium-channel blocker, we found that functional blockade of histamine itch did not affect the itch evoked by chloroquine or SLIGRL-NH2, and vice versa. Notably, blocking itch-generating fibers did not reduce pain-associated behavior. However, silencing TRPV1<SUP>+</SUP> or TRPA1<SUP>+</SUP> neurons allowed allyl isothiocyanate or capsaicin, respectively, to evoke itch, implying that certain peripheral afferents may normally indirectly inhibit algogens from eliciting itch. These findings support the presence of functionally distinct sets of itch-generating neurons and suggest that targeted silencing of activated sensory fibers may represent a clinically useful anti-pruritic therapeutic approach for histaminergic and non-histaminergic pruritus.