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  • 2005-2009  (97)
  • 1990-1994  (55)
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Year
  • 1
    Monograph available for loan
    Monograph available for loan
    Natural sinks of co2 ; 64/1-2 (1992)
    Dorderecht [u.a.] : Kluwer
    Associated volumes
    Details Availability
    Call number: 104579
    In: Water, air, and soil pollution
    Type of Medium: Monograph available for loan
    Pages: 466 p.
    ISSN: 0049-6979
    Series Statement: Water, air, and soil pollution
    Branch Library: PIK Library
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    BOOK
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  • 2
    Monograph available for loan
    Monograph available for loan
    Forested wetlands (1990)
    Amsterdam [u.a.] : Elsevier
    Associated volumes
    Details Availability
    Call number: PIK N 531-93-0143
    In: Ecosystems of the world
    Type of Medium: Monograph available for loan
    Pages: 527 S.
    ISBN: 0444428127
    Series Statement: Ecosystems of the world
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 3
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    A comparative study of natural, formaldehyde-treated and copolymer-grafted orange peel for Pb(II) adsorption under batch and continuous mode (2009)
    Elsevier
    Details
    Publication Date: 2009-01-01
    Print ISSN: 0304-3894
    Electronic ISSN: 1873-3336
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Technology
    Published by Elsevier
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    PAPER CURRENT
  • 4
    Electronic Resource
    Electronic Resource
    Grain Refinement of Pure Copper by ECAP (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 393-398 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Pure commercial Cu of 99,98 wt % purity was processed at room temperature by Equal-Channel Angular Pressing (ECAP) following route Bc. Heavy deformation was introduced in thesamples after a considerable number of ECAP passes, namely 1, 4, 8, 12 and 16. A significant grainrefinement was observed by transmission electron microscopy (TEM). Tensile and microhardnesstests were also carried out on the deformed material in order to correlate microstructure andmechanical properties. Microhardness measurements displayed a quite homogeneous straindistribution. The most significative microstructural and mechanical changes were introduced in thefirst ECAP pass although a gradual increment in strength and a slight further grain refinement wasnoticed in the consecutive ECAP passes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.393.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Rehabilitation of Tropical Lands: A Key to Sustaining Development (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Restoration ecology 2 (1994), S. 0 
    Details
    ISSN: 1526-100X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Land rehabilitation is proposed as a management strategy to reverse the negative consequences of tropical deforestation and land degradation. We first define the concepts associated with ecosystem modification—conversion, damage, and degradation—and those associated with ecosystem repair—restoration, rehabilitation, and reclamation. We then present a scheme of sustainable land use in the tropics, with illustrations of how rehabilitation and restoration activities fit into the overall scheme of the use of land. Because damaged lands cannot contribute effectively to sustained economic development, land rehabilitation is a necessary step for increasing the chances of attaining sustainability. Approaches for rehabilitating ecosystems are discussed, including the management of stressors and subsidies in relation to their point of interaction in the ecosystem. Finally, we illustrate the concepts of ecosystem rehabilitation of damaged, degraded, and derelict lands with examples of case studies from dry to humid life zones in island and continental situations throughout the tropics. The case studies demonstrate that opportunities for success exist, even with severely degraded lands, but a considerable amount of research remains to be done before we have a full understanding of the complexity of the task facing us.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1526-100X.1994.tb00047.x
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  • 6
    Electronic Resource
    Electronic Resource
    Physical, Textural, and Microstructural Properties of Restructured Adductor Muscles of 2 Scallop Species Using 2 Cold-binding Systems (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 70 (2005), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : This work evaluated the effect of caseinate-transglutaminase and fibrinogen-thrombin cold-set binding systems on physical, textural, and microstructural properties of restructured adductor muscles of 2 commercially important species of scallops found in Mexico, the Pacific calico scallop (catarina scallop; Argopecten ventricosus) and the giant lions-paw scallop (Nodipecten subnodosus). Proximate composition and surface pH was measured in raw materials. Color, water-holding capacity, and texture, including the Warner-Bratzler shear test and texture profile analysis were determined for restructured products and raw material. Results indicate that binders affected color in lions-paw scallops. Caseinate-transglutaminase did not affect color of restructured samples of either species. The effect of cold-set binding systems on the water-holding capacity was observed only for lions-paw scallops. In different ways, binders affected texture parameters except for gumminess and adhesiveness. Differences in microstructure of the binder matrices were observed. The caseinate-transglutaminase matrix exhibited a solid continuous phase and the fibrinogen-thrombin system exhibited a discontinuous matrix with different levels of aggregation of the material. Results indicated that, not only the restructuring system, but also the species influenced color, water-holding capacity, and texture of restructured products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2005.tb07094.x
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of Sodium Chloride, Acetic Acid, and Enzymes on Carotene Extraction in Carrots (Daucus carota L.) (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 70 (2005), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Carrot root cores were cut off longitudinally and treated with NaCl (0.6 and 1.2 M) and/or acetic acid (1.33%, 2.67%, and 4%) solutions. The extractability of the carotenes was estimated. Similarly, carrot cores were also treated with some degrading enzymes (carbohydrases, lipases, and proteases) alone or in combination to study the effect of the tissue rupture or the hydrolysis of possible complexes or interactions between carotenes and other components on the carotene extractability. The results showed that acetic acid increased the extractability of α- and β carotenes up to 99.8% and 94.6%, respectively, at a 4% acid concentration compared with the samples without any treatment. This increase was directly proportional to the acid concentration. An increase in extractability was also observed for NaCl, although the increases were not as high as in the previous case with values of 49% and 41.4% for α- and β-carotenes respectively at a 0.6 M concentration. The study of microstructural changes and extractability revealed that the enzymatic treatments could have broken some carotene complexes and interactions and altered the carbohydrate matrix structure, increasing to a certain extent the extractability of carotenes. It can be concluded then that pickling with 4% acetic acid is a good method to increase the extractability of α- and β-carotenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2005.tb07118.x
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  • 8
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    Morfometría de la República Mexicana (1992)
    Madrid : Periodicals Archive Online (PAO)
    Estudios geográficos. 53:206 (1992:enero/abr.) 77 
    Details
    ISSN: 0014-1496
    Topics: Geography
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:6094-1992-053-06-000007
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  • 9
    Electronic Resource
    Electronic Resource
    Wave-energy distribution and hurricane effects on Margarita Reef, southwestern Puerto Rico (1994)
    Springer
    Coral reefs 13 (1994), S. 21-32 
    Details
    ISSN: 1432-0975
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Wave measurements at Margarita Reef in southwestern Puerto Rico show that wave height decreases as waves travel across the forereef and into the backreef. Wave spectra reveal the presence of two wave trains impinging on the reef during the study: trade-wind waves and locally generated seas. Significant wave height calculated from the spectra show an average reduction of 19.5% from 20- to 10-m isobaths and 26% from 20- to 5-m isobaths. The significant wave height decreases an average of 82% for waves traveling across the reef crest and into the backreef. Wave-energy reduction is 35% from 20- to 10-m isobaths and 45% from 20- to 5-m isobaths. Energy loss across the reef crest is 97% which translates into the formation of strong across-the-reef currents capable of moving coarse sediment. Refraction diagrams of waves impinging on the reef from the SE provide a display of wave energy distribution around the reef. The transmission coefficients calculated for trade-wind waves and locally generated seas have means of 18% and 39%, respectively. A wave height model with negligible energy dissipation, produces wave height estimates that are, in general, within the ±15% error bands. Results of wave-energy changes from this study were applied to waves representative of hurricane conditions at the reef. Aerial photographs of the reef before and after the passage of hurricanes were compared to assess the reef changes. Changes observed in the photographs are interpreted as products of sediment transport by hurricane-generated waves. The patterns of change agree with the refraction diagrams suggesting that waves were the main agents of change at margarita Reef during severe storms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00426431
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  • 10
    Electronic Resource
    Electronic Resource
    Nigericin forms highly stable complexes with lithium and cesium (1992)
    Springer
    Journal of bioenergetics and biomembranes 24 (1992), S. 125-129 
    Details
    ISSN: 1573-6881
    Keywords: Nigericin ; carboxylic polyether ; carboxylic ionophore ; ion transport ; ionic complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract Nigericin is a monocarboxylic polyether molecule described as a mobile K+ ionophore unable to transport Li+ and Cs+ across natural or artificial membranes. This paper shows that the ion carrier molecule forms complexes of equivalent energy demands with Li+, Cs+, Na+, Rb+, and K+. This is in accordance with the similar values of the complex stability constants obtained from nigericin with the five alkali metal cations assayed. On the other hand, nigericinalkali metal cation binding isotherms show faster rates for Li+ and Cs+ than for Na+, K+, and Rb+, in conditions where the carboxylic proton does not dissociate. Furthermore, proton NMR spectra of nigericin-Li+ and nigericin-Cs+ complexes show wide broadenings, suggesting strong cation interaction with the ionophore; in contrast, the complexes with Na+, K+, and Rb+ show only clear-cut chemical shifts. These latter results support the view that nigericin forms highly stable complexes with Li+ and Cs+ and contribute to the explanation for the inability of this ionophore to transport the former cations in conditions where it catalyzes a fast transport of K+〉Rb+〉Na+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00769539
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