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  • 1
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    Valuing groundwater and other natural capital [Sustainability Science] (2016)
    National Academy of Sciences
    Details
    Publication Date: 2016-03-02
    Description: Valuing natural capital is fundamental to measuring sustainability. The United Nations Environment Programme, World Bank, and other agencies have called for inclusion of the value of natural capital in sustainability metrics, such as inclusive wealth. Much has been written about the importance of natural capital, but consistent, rigorous valuation approaches...
    Keywords: Sustainability Science
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 2
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    Managing ecological thresholds in coupled environmental-human systems [Sustainability Science] (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-05-04
    Description: Many ecosystems appear subject to regime shifts—abrupt changes from one state to another after crossing a threshold or tipping point. Thresholds and their associated stability landscapes are determined within a coupled socioeconomic–ecological system (SES) where human choices, including those of managers, are feedback responses. Prior work has made one of two assumptions about managers: that they face no institutional constraints, in which case the SES may be managed to be fairly robust to shocks and tipping points are of little importance, or that managers are rigidly constrained with no flexibility to adapt, in which case the inferred thresholds may poorly reflect actual managerial flexibility. We model a multidimensional SES to investigate how alternative institutions affect SES stability landscapes and alter tipping points. With institutionally dependent human feedbacks, the stability landscape depends on institutional arrangements. Strong institutions that account for feedback responses create the possibility for desirable states of the world and can cause undesirable states to cease to exist. Intermediate institutions interact with ecological relationships to determine the existence and nature of tipping points. Finally, weak institutions can eliminate tipping points so that only undesirable states of the world remain.
    Keywords: Sustainability Science
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 3
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    Ecosystem-based management and the wealth of ecosystems [Sustainability Science] (2017)
    National Academy of Sciences
    Details
    Publication Date: 2017-06-21
    Description: We merge inclusive wealth theory with ecosystem-based management (EBM) to address two challenges in the science of sustainable management of ecosystems. First, we generalize natural capital theory to approximate realized shadow prices for multiple interacting natural capital stocks (species) making up an ecosystem. These prices enable ecosystem components to be...
    Keywords: Sustainability Science
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and complex-forming properties of crown ethers incorporating glucuronic acid moieties (1996)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 26 (1996), S. 321-330 
    Details
    ISSN: 1573-1111
    Keywords: Chiral crown ethers ; complex formation ; glucuronic acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Crown ethers1 and4 of the 18-crown-6 type containing two glucose units have been oxidised by KMnO4 into mono- and dicarboxylic acid derivatives (5 and11), and derivatives with different lipophilicities of the above crown ethers, namely the acetyl, benzyl and butyl derivatives (8–10, 13, 14) and methyl esters (6 and12) have been synthesized The association constants (K a) with Li, Na, K and NH4 cations measured in CHCl3 indicate that complexing ability increases on introduction of carboxy groups, and selectivity changes in favour of the Na cation. These compounds were able to transport alkyl-ammonium salts through a CHCl3 liquid membrane, displaying, however, no chiral recognition ability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053549
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  • 5
    Electronic Resource
    Electronic Resource
    The complexing ability of crown ethers incorporating glucose (1993)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 16 (1993), S. 17-23 
    Details
    ISSN: 1573-1111
    Keywords: Crown ether ; complex formation ; extraction ability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The complexing (in CHCl3) and extracting abilities of 18-crown-6 type compounds (1–15) were measured with Li, Na, K and NH4 cations. The substituents on the sugar part affected these properties significantly (K a=103–107). Some substituents, like acetyloxy groups (3) decreased whereas others, like tosyloxy groups (10, 11) significantly increased the complexing ability and thus changed the selectivity. The compound with four tosyloxy groups (11) shows an excellent picrate salt extracting ability in a CH2Cl2-water system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00708759
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  • 6
    Electronic Resource
    Electronic Resource
    Expression of the complement regulatory protein CD59 on human spermatozoa: Characterization and role in gametic interaction (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 38 (1994), S. 338-346 
    Details
    ISSN: 1040-452X
    Keywords: Human sperm antigens ; Complement regulatory proteins ; Protectin CD59 ; Membrane attack complex ; Cell-to-cell adhesion ; Gametic interaction ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Protectin (CD59) is a complement regulatory protein which blocks the membrane attack complex during complement activation. CD59 was identifield on the human sperm surface by means of H19, an IgG1 anti-protectin mouse monoclonal antibody. Using Indirect immunofluorescence, flow cytometry and immunoperoxidase, CD59 was found to be present on the whole plasma membrane including the head and tail of fresh ejaculated, capacitated and acrosome-reacted spermatozoa. Immunoperoxidase staining of normal testicular sections indicated that this protein was already present on intraluminal germ cells. Analysis of this sperm protein by gel electrophoresis and immunoblotting revealed that its molecular weight of 20 kDa was comparable to that of CD59 expressed on peripheral blood cells (erythrocytes, lymphocytes) and that it was bound to the membrane through a glycophospholipid tail which could be released after treatment with phosphatidylinositol-specific phospholipase C. Associated to membrane cofactor protein (CD46) and decay accelerating factor (CD55) located in the acrosomal membranes, CD59 may participate to the protection of male gametes against complement-mediated damage as they travel through the female genital tract. Moreover CD59, known as an adhesion molecule involved in lymphocyte rosettes, may also participate in cell to cell adhesion during gametic interaction since H19 inhibited sperm binding and reduced the penetration rate and index during the hamster egg penetration test. © 1994 Wiley-Liss, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080380316
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