Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Bioavailability of organic and inorganic phosphates adsorbed on short-range ordered aluminum precipitate (1996)
    Springer
    Microbial ecology 31 (1996), S. 29-39 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A nonreductive community-level study of P availability was conducted using various forms of adsorbed P. Orthophosphate (Pi), inositol hexaphosphate (IHP), and glucose 6-phosphate (G6P) were adsorbed to a short-range ordered Al precipitate. These bound phosphates provided a P source sufficient to support the growth of microbial communities from acidic Brazilian soils (oxisols). Adsorbed IHP, the most abundant form of organic phosphate in most soils, had the lowest bioavailability among the three phosphates studied. Adsorbed G6P and Pi were almost equally available. The amount of adsorbed Pi (1 cmol P kg−1) required to support microbial growth was at least 30 times less than that of IHP (30 cmol P kg−1). With increased surface coverage, adsorbed IHP became more bioavailable. This availability was attributed to a change in the structure of surface complexes and presumably resulted from the decreased number of high-affinity surface sites remaining at high levels of coverage. It thus appears that the bioavailability of various forms of adsorbed phosphate was determined primarily by the stability of the phosphate-surface complexes that they formed, rather than by the total amount of phosphate adsorbed. IHP, having the potential to form stable multiple-ring complexes, had the highest surface affinity and the lowest bioavailability. Bioaggregates consisting of bacteria and Al precipitate were observed and may be necessary for effective release of adsorbed P. Bacteria in the genera Enterobacter and Pseudomonas were the predominate organisms selected during these P-limited enrichments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00175073
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Adsorption of Hydroxy-aluminium Polymers by Muscovite and Biotite (1970)
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 1084-1085 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1. ADSORPTION OF HYDROXY- ALUMINIUM POLYMERS BY VARIOUS SIZE FRACTIONS OF MUSCOVITE AND BIOTITE mg of Al adsorbed/g of mineral Muscovite Biotite Ratio of hydroxy-aluminium Ratio of hydroxy-aluminium solution to mineral solution to mineral 25 ml./g 50 ml./g 100 ml./g 25 ml./g 50 ml./g 100 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2281084a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Fluoride Interaction with Clays in Relation to Third Buffer Range (1966)
    [s.l.] : Nature Publishing Group
    Nature 211 (1966), S. 779-780 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] No fluoride that could be analytically detected remained in the clay or soil sample. A series of carbon replicas of micas shows (Fig. 1) that biotite and muscovite surfaces are disrupted by the reaction in neutral 1 N potassium fluoride solution for 12-24 h. Furthermore, potentio-graphic evidence ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/211779a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Role of Mn(IV) oxide in abiotic formation of humic substances in the environment (1982)
    [s.l.] : Nature Publishing Group
    Nature 298 (1982), S. 363-365 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 Effects of Mn, Fe, Al and Si oxides on the browning of hydroquinone solution at different p H values at the end of the reaction period of 24 h Oxide* Initial pH of 4.0 Initial pH of 5.0 Initial p H of 6.0 Final Absorbance Final Absorbance Final Absorbance pH Eh(V) 400 nm 600 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/298363a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Hydroxy-aluminosilicate interlayers in montmorillonite: implications for acidic environments (1988)
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 625-627 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The solution of HAS ions used in this study had a Si/Al molar ratio of 0.56 and exhibited infrared absorption bands at 970, 568, 425 and 342 cm"1, which resemble those reported by Wada and Wada1 and Farmer et al14. The absorption bands at 970 and 342 cm"1 are indicative of the formation of Si-O-Al ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/335625a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Significance of Mn(IV) oxide in abiotic formation of organic nitrogen complexes in natural environments (1984)
    [s.l.] : Nature Publishing Group
    Nature 308 (1984), S. 57-58 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Birnessite (d?n?2) was prepared and used in this study, since it is one of the most common Mn oxides present in soil10. Glycine, an amino acid, and hydroquinone, a diphenol, of cer tified reagent grade were used, because these compounds and their structural units are widely distributed in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/308057a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Influence of citric acid on the natural formation of imogolite (1984)
    [s.l.] : Nature Publishing Group
    Nature 308 (1984), S. 58-60 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the absence of citric acid, heating the solution containing hydroxy-Al ions and orthosilicic acid to 96-100 C for 110 h generated a colloidal precipitate (Table 1). The interaction of hydroxy-Al ions with orthosilicic acid caused a marked fall in pH. In the presence of citric acid, all the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/308058a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Oxidative power of Mn( IV ) and Fe( III ) oxides with respect to As( III ) in terrestrial and aquatic environments (1981)
    [s.l.] : Nature Publishing Group
    Nature 291 (1981), S. 50-51 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Birnessite (d-???2) was prepared and used in this study because it is one of the most common Mn oxides in sediments and soils4. The appearance of As(v) in solution after adding solutions of various concentrations of As(ni) to Mn(iv) oxide (Table 1) clearly shows that As(ni) is converted to As(v) by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/291050a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Sorption of phosphate by hydrolytic reaction products of aluminium (1978)
    [s.l.] : Nature Publishing Group
    Nature 271 (1978), S. 336-338 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 shows the retention of phosphate by the hydrolytic precipitation products of aluminium increased with concentration of citric acid present during their formation. After 40 d, for instance, the solid phase products formed in the presence of 106 M citric acid retained, over the pH range 4-8, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/271336a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Humic macromolecule Interlayering in nontronite through interaction with phenol monomers (1986)
    [s.l.] : Nature Publishing Group
    Nature 323 (1986), S. 529-531 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The growth of micro-organisms in the systems studied was not evident (Table 1); all the reactions observed in this study were thus abiotic processes. The data (Table 2) show that at the end of a 20-day reaction period, the absorbance of the supernatant of the hydroquinone-nontronite system at 664 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/323529a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...