ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
Filter
  • pH  (11)
  • Springer  (11)
  • 1985-1989  (11)
  • 1988  (11)
Collection
Keywords
Publisher
  • Springer  (11)
Years
  • 1985-1989  (11)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Response of Lotus rhizobia to acidity and aluminium in liquid culture and in soil (1988)
    Springer
    Plant and soil 107 (1988), S. 227-231 
    Details
    ISSN: 1573-5036
    Keywords: aluminium ; Bradyrhizobium sp. (Lotus) ; Lotus pedunculatus ; nitrogen fixation ; nodulation ; pH ; Rhizobium loti ; soil acidity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Measurements of multiplication in liquid culture indicated that fast-growing Lotus rhizobia (Rhizobium loti) were tolerant of acidity and aluminium (at least 50 μM A1 at pH 4.5). Slow-growing Lotus rhizobia (Bradyrhizobium sp. (Lotus)) were less tolerant of acidity but equally tolerant of A1. Both genera were able to nodulateLotus pedunculatus in an acid soil (pH 4.1 in 0.01M CaCl2) and the slow-growing strains were more effective than the fast-growing strains in this soil over 30 days.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370551
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    In vitro cytotoxicity of pyrazine-2-diazohydroxide: specificity for hypoxic cells and effects of microsomal coincubation (1988)
    Springer
    Investigational new drugs 6 (1988), S. 3-9 
    Details
    ISSN: 1573-0646
    Keywords: pyrazine-2-diazohydroxide ; cytotoxicity ; hypoxia ; microsomes ; pH ; metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The antitumor drug pyrazine-2-diazohydroxide exhibits cytotoxicity to A204 tumor cells in vitro under acid conditions. The IC50 with a 1 hr drug exposure at pH of 7.4 was 61 μg/ml and at pH of 6.0 it was 31 μg/ml. It is suggested that the increased cytotoxicity is due to the acid catalyzed formation of a reactive pyrizinyldiazonium ion from pyrazine-2-diazohydroxide. Pyrazine-2-diazohydroxide is also more cytotoxic to A204 cells under hypoxic conditions in the presence of glucose with an IC50 at pH 7.4 of 22 μg/ml. The increased cytotoxicity of pyrazine-2-diazohydroxide under acid and hypoxic conditions may favor selective toxicity to solid tumors in vivo. Coincubation with rat hepatic microsomes increased the cytotoxicity of pyrazine-2-diazohydroxide to A204 cells. The effect did not require NADPH and was not due to formation of metabolites. There was an increased rate of degradation of pyrazine-2-diazohydroxide in the presence of microsomes, presumably with formation of the pyrizinyldiazonium ion. The final degradation product 2-hydroxypyrazine was not cytotoxic to A204 cells. The effect of microsomes on pyrazine-2-diazohydroxide cytotoxicity is probably of little in vivo significance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170773
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Fate of nitrogen fertilizer applied to lowland rice on a Sulfic Tropaquept (1988)
    Springer
    Nutrient cycling in agroecosystems 16 (1988), S. 227-240 
    Details
    ISSN: 1573-0867
    Keywords: Urea ; urea supergranule ; phenyl phosphorodiamidate ; 15N balance ; N losses ; pH ; acid sulfate soil ; ammonium phosphate sulfate ; Oryza sativa L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A field experiment was conducted on an acid sulfate soil in Thailand to determine the effect of N fertilization practices on the fate of fertilizer-N and yield of lowland rice (Oryza sativa L.). A delayed broadcast application of ammonium phosphate sulfate (16-20-0) or urea was compared with basal incorporation of urea, deep placement of urea as urea supergranules (USG), and amendment of urea with a urease inhibitor. Deep placement of urea as USG significantly reduced floodwater urea- and ammoniacal-N concentrations following N application but did not reduce N loss, as determined from an15N balance, in this experiment where runoff loss was prevented. The urease inhibitor, phenyl phosphorodiamidate (PPD), had little effect on floodwater urea- and ammoniacal-N, and it did not reduce N loss. The floodwater pH never exceeded 4.5 in the 7 days following the first N applications, and application of 16-20-0 reduced floodwater pH by 0.1 to 0.3 units below the no-N control. The low floodwater pH indicated that ammonia volatilization was unimportant for all the N fertilization practices. Floodwater ammoniacal-N concentrations following application of urea or 16-20-0 were greater on this Sulfic Tropaquept than on an Andaqueptic Haplaquoll with near neutral pH and alkaline floodwater. The prolonged, high floodwater N concentrations on this Sulfic Tropaquept suggested that runoff loss of applied N might be a potentially serious problem when heavy rainfall or poor water control follow N fertilization. The unaccounted-for15N in the15N balances, which presumably represented gaseous N losses, ranged from 20 to 26% of the applied N and was unaffected by urea fertilization practice. Grain yield and N uptake were significantly increased with applied N, but grain yield was not significantly affected by urea fertilization practice. Yield was significantly lower (P = 0.05) for 16-20-0 than for urea; however, this difference in yield might be due to later application of P and hence delayed availability of P in the 16-20-0 treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01051373
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Thermoplastic matrix controlled-release zinc fertilizers (1988)
    Springer
    Nutrient cycling in agroecosystems 17 (1988), S. 251-266 
    Details
    ISSN: 1573-0867
    Keywords: Zinc ; controlled-release ; diffusion ; pH ; temperature ; phosphate ; clay ; sand ; moisture content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The emission and movement of zinc from planar arrangements of controlled-release (C.R.) thermoplastic matrix zinc fertilizer formulations was studied in cylindrical diffusion cells packed with a clay or a sand. The influences of a number of soil characteristics known to affect zinc diffusion were also investigated. Zinc emission was initially (over 2 days) very rapid. The rate declined markedly thereafter. Morphologically distinct C.R. zinc formulations released zinc at different rates. Zinc moved appreciably and consistently further in the sand than in the clay. Of the soil characteristics studied, increasing phosphate levels had no effect upon zinc emission or mobility in either soil. Increasing pH in the sand did not affect zinc emission, but decreased zinc mobility. Conversely, in the two soils, increasing temperature stimulated zinc emission, but had little influence on zinc mobility. At higher water contents, zinc release was increased in both soils. However, zinc movement was only increased in the sand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049581
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The root surface phosphatases ofEriophorum vaginatum: Effects of temperature, pH, substrate concentration and inorganic phosphorus (1988)
    Springer
    Plant and soil 105 (1988), S. 3-10 
    Details
    ISSN: 1573-5036
    Keywords: arctic ; Eriophorum ; pH ; phosphatases ; phosphorus ; PNPPase ; root enzymes ; temperature ; tundra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Eriophorum vaginatum L. subsp.spissum (Fern.) Hult., a dominant plant in arctic tundra ecosystems, has acid phosphatase activity evenly distributed along its root surface from the root tip to a distance at least 16 cm from the tip. These root surface phosphatases have optimal activity from pH 3.5 to 4.0; mean soil pH for soil samples collected with roots was 3.69. Apparent energy of activation and Q10 values (14.0 kcal mol−1 and 2.2, respectively) do not provide evidence for temperature acclimation, but substantial phosphatase activity was measured at 1°C. Kinetic parameters determined for this root surface phosphatase were as follows: Km=9.23 mM, Vmax=1.61×10−3 μmoles mm−2h−1. The presence of inorganic phosphorus in the assay medium did not inhibit root surface phosphatase activity except at very high concentrations (100 mM); even then, only slight inhibition was detected (7 to 19%). A comparison of hydrolysis rates with inorganic phosphate assimilation rates measured forE. vaginatum indicates that organic phosphate hydrolysis may occur at approximately one third the rate of inorganic phosphate absorption. Calculations show that inorganic phosphate produced by root surface phosphatase activity may satisfy 65% of the annual phosphate demand ofE. vaginatum. Since arctic tundra soils are typically higher in dissolved organic phosphorus compounds than in inorganic phosphate, root surface phosphatase activity may make a considerable contribution to the phosphate nutrition of this widespread and abundant arctic plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371136
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The effects of pH and calcium on the growth ofLeucaena leucocephala in an oxisol and ultisol soil (1988)
    Springer
    Plant and soil 106 (1988), S. 209-214 
    Details
    ISSN: 1573-5036
    Keywords: calcium carbonate ; calcium supply ; exchangeable cations ; leucaena ; liming ; oxisol ; pH ; root growth ; shoot growth ; strontium carbonate ; ultisol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Leucaena was grown for eleven weeks in a pH and calcium amended oxisol and ultisol to determine whether poor growth in acid soils is related to calcium deficiency or low pH induced effects, such as aluminium toxicity. Soil pH was ameliorated by the addition of either CaCO3, or SrCO3, while CaCO3 or Ca(NO3)2 were used to modify calcium supply. In both soils, CaCO3, and SrCO3 application resulted in an increase in pH and a reduction in exchangeable aluminium although the response of leucaena to the applied amendment varied between the two soils. In the oxisol there was little effect of increased pH on growth, but a marked response to Ca application. In the ultisol, growth was improved by increasing pH but there was no response to increased calcium. The effects of liming on these soils are discussed in relation to alternative strategies available for utilising leucaena and other tree legumes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371215
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Phosphorus and pH relationships in an andic soil with surface and incorporated organic amendments (1988)
    Springer
    Plant and soil 107 (1988), S. 273-278 
    Details
    ISSN: 1573-5036
    Keywords: available P. organic amendments ; pH ; Phosphorus ; residue management Volcanic ash-influenced soils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Mission silt loam, (coarse-silty, mixed frigid Andic Fragiochrepts) is a forest soil in the Pacific Northwest which has a weathered ash horizon derived from volcanic eruptions in the Cascade Mountain Range. The major production problem for this soil is P fixation due to the weathered volcanic ash. Alternatives to large additions of fertilizer P are considered important in management of this and related soils. The objective of this work was to study the infuence of organic amendments on soil pH and extractable P in Mission soil. Alfalfa, (Medicago sativa L.) mixed conifer bark or sawdust was added at 4.8% w/w soil as a surface or incorporated treatment. In incubation experiments, both extractable P and soil pH were significantly increased over time for both surface and incorporated amendments. The majority of P mineralized from surface applied alfalfa remained in the surface 0–2 cm of the soil regardless of incubation period. Conversely, a uniform increase in P occurred throughout the 18 cm soil depth when sawdust was surface applied. The change in extractable P with sawdust addition was equivalent to 61 mg P kg−1 soil as soluble inorganic material. Soil pH increased rapidly in proximity to surface applied alfalfa while bark and sawdust affected the soil increasingly with time regardless of placement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370557
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    The effect of pH on the uptake of cadmium by four plant species grown in flowing solution culture (1988)
    Springer
    Plant and soil 105 (1988), S. 121-126 
    Details
    ISSN: 1573-5036
    Keywords: Cadmium ; Dactylis glomerata L. ; Lactuca sativa L. ; Lolium perenne L. ; pH ; Rorippa nasturstium-aquaticum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Cadmium absorption and distribution in four plant species was studied using a system of flowing solution culture with cadmium added at 0.018 mmolm−3 and solution pH controlled at 5.0, 5.5, 6.0 or 7.0. With increasing pH from 5.0 to 7.0 the total cadmium content increaed by factors of 4 in cocksfoot, 8 in perennial ryegrass and 10 in lettuce and watercress. With the two grasses less than 15% of the total cadmium was transported to the shoots irrespective of solution pH. In contrast, 45 to 75% was transported to the shoots of lettuce and watercress, so increasing the risk of cadmium causing harm by entering the food chain through the edible part of the plant. The concentration in the dry matter of lettuce shoots increased from 1.9 to 26.2μg Cd g−1 with increasing pH from 5.0 to 7.0 whilst in watercress shoots the concentration increased from 14.3 to 118.5 μg g−1. It was concluded that the absorption of cadmium by the four species was markedly suppressed by acidification due to increased competition with hydrogen ion. This would explain why plants grown on soils take up less cadmium with decreasing pH than would be expected from the increase in solubility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371149
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Nitrogen source effects on rhizosphere pH and nutrient accumulation by Pacific Northwest conifers (1988)
    Springer
    Plant and soil 105 (1988), S. 79-86 
    Details
    ISSN: 1573-5036
    Keywords: ammonium ; Douglas-fir ; nitrate ; nitrogen source ; manganese ; rhizosphere ; pH ; seedlings ; Sitka spruce ; western hemlock
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Nitrogen source effects on rhizosphere pH were evaluated for Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco], Sitka spruce [Picea sitchensis (Bong.) Carr.] and western hemlock [Tsuga heterophylla (Raf.) Sarg.] seedlings and a 40-year-old second growth Douglas-fir stand. Nitrogen additions of 400 mg kg−1 decreased rhizosphere pH up to 0.7 units in ammonium treatments and increased pHr by up to 1.2 units in nitrate treatments. Both N sources increased foliar N but did not increase foliar P. Rhizosphere pH effects differed between the two soils used in the seedling study. Ovall soil with higher native ammonium levels had less pH increase with added nitrate. All three conifer seedlings reacted similarly to nitrogen source. Changes in rhizosphere pH of Douglas-fir seedlings were evident one week after nitrogen application and these changes were statistically significant after two weeks. Nitrogen induced pH changes were related to N added but the relation was not linear, and followed the buffering capacity curves of both soils. As pH decreased foliar Mn levels increased dramatically. Rhizosphere pH of a 40-year-old Douglas-fir stand followed the same trends as seedlings. Ammonium decreased pH in the soil surface only, while nitrate increased rhizosphere pH to a depth of 20 to 30 cm. Changes were evident one year after application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371145
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    The response of macroinvertebrates to experimental episodes of low pH with different forms of aluminium, during a natural spate (1988)
    Springer
    Hydrobiologia 169 (1988), S. 225-232 
    Details
    ISSN: 1573-5117
    Keywords: pH ; aluminium ; drift ; macroinvertebrates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 24 h experimental episodes were created in a soft-water stream in upland Wales, by the simultaneous addition at separate points of sulphuric acid, aluminium sulphate and citric acid. In an upstream reference zone (A) the pH remained above 7, while in the treatment zones, B, C and D successively downstream, it was reduced to c. pH 4.9. Concentrations of filterable aluminium were 0.05 mg l-1 in Zone B, 0.27 mg l-1 (0.11 mg l-1 ‘labile’) in Zone C, and 0.23 mg l-1 (0.00 mg l-1 ‘labile’) in Zone D. Chemical manipulation coincided with a spate, during which flow increased from 0.02 m3s -1 to a maximum of 0.07 m3s-1. Only the ephemeropteran B. rhodani showed a drift response: drift density was not affected by flow (Zone A) or by organically bound aluminium (Zone D), but increased approximately 6-fold in both the acid (B) and ‘labile’ aluminium (C) zones; its benthic density declined significantly in Zones C and D, by 78% and 89% respectively. We relate these results to the biological importance of aluminium chemistry during natural acidic episodes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007313
    Location Call Number Expected 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...