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  • 1
    Electronic Resource
    Electronic Resource
    Bingley : Emerald
    International journal of sustainability in higher education 6 (2005), S. 81-94 
    ISSN: 1467-6370
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Education
    Notes: Purpose - The purpose of this paper is to examine the link between sustainability education and outdoor education and to encourage outdoor recreation educators to evaluate their programs with regard to sustainability and sustainable living. Design/methodology/approach - This paper starts by presenting several factors that currently hinder the delivery of sustainability education in outdoor recreation training programs. It then turns to a presentation of Lefebvre's sustainability education framework, which offers a helpful structure for integrating sustainability education into outdoor recreation academic curricula. Findings - Although there are programs that have successfully implemented sustainability training into their curricula, there are many factors that serve to hinder the education of outdoor recreation students in the philosophy and techniques of sustainability and sustainable living. No doubt these impediments pose critical challenges to those offering academic training programs. These challenges must be identified, met and overcome if the profession is to contribute, as it should, not only to local, national and global sustainable outdoor recreation, but also to sustainable living in general. Originality/value - It is hoped that this paper will encourage educators of post-secondary outdoor recreation to better equip their students to introduce and teach others with respect to sustainable living values and practices.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 280-286 
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Chymotrypsin is a member of the trypsin family of serine proteases and is one of the first proteins successfully studied by X-ray crystallography. It is secreted into the intestine as the inactive precursor chymotrypsinogen; four sequential cleavages of the peptide bonds following residues 13, 15, 146 and 148 occur to generate the active π, δ, κ and α forms of chymotrypsin. 13C NMR has shown [O'Connell & Malthouse (1995). Biochem. J. 307, 353–359] that when the δ form of chymotrypsin is inhibited by 2-13C-enriched benzyloxycarbonylglycylglycylphenylalanyl chloromethane, a tetrahedral adduct is formed which is thought to be analogous to the tetrahedral intermediate formed during catalysis. This inhibitor complex has been crystallized as a dimer in space group P41212. The structure has been refined at 2.14 Å resolution to an R value of 21.2% (free R = 25.2%). Conformational differences between δ-chymotrypsin and chymotrypsinogen in the region of the flexible autolysis loop (residues 145–150) were observed. This is the first crystal structure of δ-chymotrypsin and includes two residues which are disordered in previous crystal structures of active chymotrypsin. A difference of 11.3 Å2 between the average B values of the monomers within the asymmetric unit is caused by lattice-disordering effects approximating to rotation of the molecules about a crystallographic screw axis. The substrate-binding mode of the inhibitor was similar to other chymotrypsin peptidyl inhibitor complexes, but this is the first published chymotrypsin structure in which the tetrahedral chloromethyl ketone transition-state analogue is observed. This structure is compared with that of a similar tetrahedral transition-state analogue which does not alkylate the active-site histidine residue.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Environmental monitoring and assessment 51 (1998), S. 131-143 
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Our premise is that measures of ecological indicators and habitat conditions will vary between reference standard sites and reference sites that are impacted, and that these measures can be applied consistently across a regional gradient in the form of a Regional Index of Biological Integrity (RIBI). Six principles are proposed to guide development of any RIBI: 1) biological communities with high integrity are the desired endpoints; 2) indicators can have a biological, physical, or chemical basis; 3) indicators should be tied to specific stressors that can be realistically managed; 4) linkages across geographic scales and ecosystems should be provided; 5) reference standards should be used to define target conditions; and 6) assessment protocols should be efficiently and rapidly applied. To illustrate how a RIBI might be developed, we show how four integrative bioindicators can be combined to develop a RIBI for forest riparian ecosystems in the Mid-Atlantic states: 1) macroinvertebrate communities, 2) amphibian communities, 3) avian communities, and 4) avain productivity, primarily for the Louisiana waterthrush (Seirius motacilla). By providing a reliable expression of environmental stress or change, a RIBI can help managers reach scientifically defensible decisions.
    Type of Medium: Electronic Resource
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