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  • zinc  (5)
  • Springer  (5)
  • American Geophysical Union (AGU)
  • American Physical Society (APS)
  • Blackwell Publishing Ltd
  • 1990-1994  (5)
  • 1980-1984
  • 1970-1974
  • 1940-1944
Collection
Keywords
Publisher
  • Springer  (5)
  • American Geophysical Union (AGU)
  • American Physical Society (APS)
  • Blackwell Publishing Ltd
Years
  • 1990-1994  (5)
  • 1980-1984
  • 1970-1974
  • 1940-1944
Year
  • 1
    Electronic Resource
    Electronic Resource
    Calcium-dependent zinc efflux in human red blood cells (1991)
    Springer
    The journal of membrane biology 123 (1991), S. 73-82 
    Details
    ISSN: 1432-1424
    Keywords: calcium ; zinc ; erythrocytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Zinc efflux from human red blood cells is largely brought about by a saturable mechanism that depends upon extracellular Ca2+ ions. It has aV max of about 35 μmol/1013 cells hr, aK m for external Ca2+ of 1×10−4 m, and aK m for internal Zn2+ of 1×10−9 m. External Zn2+ inhibits with aK 0.5 of 3×10−6 m. Sr2+ is a substitute for external Ca2+, but changes in monovalent anions or cations have little effect on the Zn2+ efflux mechanism. It is unaffected by most inhibitors of red cell transport systems, although amiloride and D-600 (methoxyverapamil, a Ca2+ channel blocker) are weakly inhibitory. The transport is capable of bringing about the net efflux of Zn2+, against an electrochemical gradient, provided Ca2+ is present externally. This suggests it may be a Zn2+:Ca2+ exchange, which would be able to catalyze the uphill movement of Zn2+ at the expense of an inward Ca2+ gradient, which is it self maintained by the Ca2+ pump.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01993965
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  • 2
    Electronic Resource
    Electronic Resource
    Intracellular free zinc and zinc buffering in human red blood cells (1991)
    Springer
    The journal of membrane biology 123 (1991), S. 63-71 
    Details
    ISSN: 1432-1424
    Keywords: zinc ; erythrocytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Zn2+ has been allowed to equilibrate across the red cell membrane using two agents that increase membrane permeability to this ion: the ionophore A23187 and the specific carrier ethylmaltol. Extracellular free Zn2+ was controlled with EGTA (1,2-di(2-aminoethoxy)ethane-NNN′N′tetra-acetic acid)) buffers, except in the case of ethylmaltol, which itself acts as a buffer. Measurement of cellular zinc content at different levels of free Zn2+ facilitated the study of intracellular Zn2+ binding. It was also possible to estimate intracellular free Zn2+ concentration in untreated cells using a “null-point” technique. Intracellular zinc was found to consist of an inexchangeable component of about 129 μmol/1013 cells and an exchangeable component of 6.7±1.5 μmol/1013 cells, with a free concentration of about 2.4×10−11 m. The main component of Zn2+ buffering is hemoglobin, with a dissociation constant of about 2×10−8 m.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01993964
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  • 3
    Electronic Resource
    Electronic Resource
    Transformations of ortho- and pyrophosphates with or without zinc in chemical solutions and major Indian soils (1992)
    Springer
    Nutrient cycling in agroecosystems 32 (1992), S. 279-289 
    Details
    ISSN: 1573-0867
    Keywords: Diammonium orthophosphate ; triammonium pyrophosphate ; zinc ; fertilizer reaction products ; Indian soils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Studies on the formation and identification of the nature of reaction products formed with zinc and ortho- and pyrophosphate fertilizers were carried out in chemical solutions and in contrasting Indian soils having wide pH range from acidic to alkaline. Triammonium pyrophosphate (TPP), a constituent of the newly developed ammonium polyphosphate (APP) and diammonium orthophosphate (DAP), the only orthophosphate fertilizer manufactured and used in the country were taken for these studies. The reaction products (precipitates) formed in the solutions were isolated and identified through X-ray diffraction technique and chemical analysis, and those formed at the sites of fertilizer placement separated and identified only through X-ray diffraction technique. In the study with solutions ZnNH4PO4 (orthorhombic) was identified at all levels of Zn applications and at both concentrations of 0.1Mg and 1.0M DAP; whereas, Zn3(NH4)2(P2O7)2.2H2O was observed only at the lower concentration (0.1 M) of TPP with Zn. Zinc was completely soluble at the higher concentration (1.0M) of TPP indicating the formation of a soluble complex, (NH4)6Zn(P2O7)2.6H2O. In soils, the reaction products obtained with band application of DAP alone and along with Zn fertilizers were CaHPO4.2H2O, Ca(NH4)2(HPO4)2.H2O (dimorph B), MgNH4PO4.6H2O (struvite), MgHPO4.3H2O, FePO4.2H2O (metastrengite, monoclinic), AlPO4.2H2O (orthorhombic), ZnNH4PO4 (orthorhombic) and Zn3(PO4)2.4H2O. The reaction products with TPP alone and with Zn were Ca(NH4)2P2O7.H2O, Mg(NH4)2P2O7.4H2O (monoclinic), FeH2P2O7, Ca2P2O7.2H2O (monoclinic) and Zn(NH4)2P2O7.H2O.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01050365
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  • 4
    Electronic Resource
    Electronic Resource
    Silver, copper, lead and zinc accumulation byPseudomonas stutzeri AG259 andStreptomyces albus : electron microscopy and energy dispersive X-ray studies (1994)
    Springer
    BioMetals 7 (1994), S. 201-208 
    Details
    ISSN: 1572-8773
    Keywords: accumulation ; copper ; electron microscopy ; lead ; Pseudomonas stutzeri ; silver ; Streptomyces albus ; X-ray analysis ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Metal accumulation by a silver-resistant Pseudomonas stutzeri AG259 strain and a Streptomyces albus strain was investigated in a mixed metal solution of silver, copper, lead and zinc. The location of silver, lead and copper on cells was determined by transmission electron microscopy coupled with an X-ray analysis system. In P. stutzeri cells silver was detected as dense deposits on the cells. Copper and lead were distributed over the cells. S. albus accumulated these metals only on part of cells with a higher concentration per cell than in P. stutzeri.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00140492
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  • 5
    Electronic Resource
    Electronic Resource
    Accumulation of cadmium and selected elements in flax seed grown on a calcareous soil (1993)
    Springer
    Plant and soil 150 (1993), S. 61-68 
    Details
    ISSN: 1573-5036
    Keywords: calciaquoll ; FeEDDHA ; iron ; Linum usitatissimum L. ; manganese ; phloem mobility ; phosphorus ; post-flowering N stress ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Seed of flax (Linum usitatissimum L.) grown on calcareous and neutral soils sometimes accumulates relatively high concentrations of Cd. The influence of a post-flowering application of NH4NO3 (115 mg N kg-1), CdSO4 (1 mg Cd kg-1), FeEDDHA (2 mg Fe kg-1), NaH2PO4 (120 mg P kg-1) and ZnSO4 (8 mg Zn kg-1) on seed accumulation of Cd, Fe, N, Mn, P and Zn by flax grown on a Calciaquoll was studied in two experiments under greenhouse conditions. Seed yields were increased by the N and Zn treatments, and the N×Zn interaction was positive. Zinc deficiency delayed flowering and boll formation by up to 20 days and reduced seed size. In the absence of added Cd, seed accumulated up to 0.33 mg Cd kg-1. This Cd accumulation was reduced by approximately 50 and 17% by added Zn and Fe, respectively, but was little affected by P fertilizer and post-flowering N stress. In the presence of added Cd, seed Cd exceeded 3.3 mg Cd kg-1, and the antagonistic effects of Fe and Zn on seed Cd were absent. Seed N, P, Fe and Zn concentrations were increased on average by 10, 45, 31 and 97% by the N, P, Fe and Zn fertilizer treatments, respectively. FeEDDHA reduced seed Mn concentration by approximately 58%. However, seed Mn concentration was much less than that found in vegetative tissue at flowering. Soil-applied Zn may reduce seed Cd concentration in flax under field conditions, and may increase marketability of flax for food use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00779176
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