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  • 1
    Electronic Resource
    Electronic Resource
    Use of Chelex-100 to maintain constant metal activity and application to characterization of metal complexation (1982)
    s.l. : American Chemical Society
    Analytical chemistry 54 (1982), S. 1633-1637 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00246a038
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  • 2
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary X-ray analysis of human placental S-adenosylhomocysteine hydrolase (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 339-341 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A recombinant form of human placental S-adenosylhomocysteine (AdoHcy) hydrolase expressed in E. coli, which was inactivated by a type-I mechanism-based inhibitor, has been crystallized using the hanging-drop vapour-diffusion technique. The crystals grow as flat plates, with unit-cell dimensions a = 96.2, b = 173.6, c = 142.9 Å, α = β = γ = 90°. The crystals exhibit the symmetry of space group C222 and diffract to a minimum spacing of ∼ 2.0 Å resolution at the Cornell High Energy Synchrotron Source. On the basis of density calculations two monomers of the tetrameric protein are estimated to be present in the asymmetric unit (Vm = 2.99 Å3 Da−l). The self-rotation function clearly indicates the location of the non-crystallographic twofold axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444996014746
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  • 3
    Electronic Resource
    Electronic Resource
    Two crystalline phases of chlorotris(2-pyridyl)phosphinegold(I) (1987)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 2096-2099 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270187088875
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  • 4
    Electronic Resource
    Electronic Resource
    [N,N-Bis(2-hydroxyethyl)dithiocarbamato-S,S']dichlorogold(III) (1988)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 44 (1988), S. 2082-2085 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270188008662
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of unilateral ovariectomy on recruitment and growth of follicles in the rainbow trout, Oncorhynchus mykiss (1994)
    Springer
    Fish physiology and biochemistry 13 (1994), S. 309-316 
    Details
    ISSN: 1573-5168
    Keywords: unilateral ovariectomy ; hypertrophy ; recruitment ; fecundity ; follicle ; rainbow trout
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Virgin female rainbow trout, Oncorhynchus mykiss, were unilaterally ovariectomised at various stages of ovarian development to investigate the effect of the removal of one ovary on subsequent recruitment and growth of follicles in the remaining ovary. The right ovary was removed from groups of 12–15 fish, 12, 7 and 4 months before they were due to ovulate, and the gonadosomatic index and follicle number and size determined just prior to ovulation. There were no differences in fecundity or follicle size in fish unilaterally ovariectomised at 12 and 7 months prior to ovulation compared to the controls. However, in the females unilaterally ovariectomised 4 months prior to ovulation, the remaining ovary either had the normal number of follicles for a single ovary but of a significantly larger size than follicles in the controls, or alternatively had almost 70% more than the normal number of vitellogenic follicles but comprising two distinctly different size populations. Differences in plasma oestradiol-17β concentrations at the final sample were seen only in females unilaterally ovariectomised 4 months prior to ovulation, where the levels were significantly lower than both the sham operated and control fish (p 〈 0.05). These data show that in the rainbow trout, complete compensatory ovarian hypertrophy following unilateral ovariectomy can occur throughout a major part of ovarian development, but that follicle recruitment is limited to stages up to (and therefore fecundity is determined by) mid-vitellogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00003435
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  • 6
    Electronic Resource
    Electronic Resource
    Disruption of sulfur cycling and acid neutralization in lakes at low pH (1995)
    Springer
    Biogeochemistry 28 (1995), S. 115-130 
    Details
    ISSN: 1573-515X
    Keywords: acidification ; alkalinity generation ; metaphyton ; sulfur ; sulfate reduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Experimental acidification of a softwater lake to below pH 5 fundamentally changed the sulfur cycle and lowered internal alkalinity generation (IAG). Prior to reaching pH 4.5, the balance of sulfur reduction and oxidation reactions within the lake was in favour of reduction, and the lake was a net sink for sulfate. In the four years at pH 4.5 the balance of reduction and oxidation reactions was in favour of oxidation, and there was a net production of sulfate (SO4 2−) within the lake. Evidence indicating a decrease in net SO4 2− reduction at pH 4.5 was also obtained in an anthropogenically acidified lake that had been acidified for many decades. In both lakes, the decrease in net SO4 2− reduction appeared to be linked not to a simple inhibition of SO4 2− reduction but rather to changes in benthic ecosystem structure, especially the development of metaphytic filamentous green algae, which altered the balance between SO4 2− reduction and sulfur oxidation. At pH's above 4.5, net SO4 2− reduction was the major contributor to IAG in the experimental lake, as it is in many previously studied lakes at pH 5 and above. At pH 4.5, the change in net annual SO4 2− reduction (a decrease of 110%) resulted in a 38% decrease in total IAG. Because of the important role of net SO4 2− reduction in acid neutralization in softwater lakes, models for predicting acidification and recovery of lakes may need to be modified for lakes acidified to pH 〈5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02180680
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  • 7
    Electronic Resource
    Electronic Resource
    Acidification and alkalinization of lakes by experimental addition of nitrogen compounds (1985)
    Springer
    Biogeochemistry 1 (1985), S. 117-133 
    Details
    ISSN: 1573-515X
    Keywords: acidity ; alkalinity ; lake acidification ; lake fertilization ; eutrophication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Fertilization of a small lake with ammonium chloride for four years as part of a eutrophication experiment caused it to acidify to pH values as low as 4.6. Implications for acidification of lakes via precipitation polluted with ammonium compounds are discussed. When phosphate was supplied with the ammonium, biological nitrogen uptake, apparently by phytoplankton, was the main mechanism causing acidification. When ammonium was applied without phosphate, it accumulated to high concentrations in solution, after which nitrification caused rapid acidification. In both cases, the whole-lake efficiency of acidification was low, averaging about 13% of the potential acidification of supplied ammonium chloride (Table 2). Subsequent application of phosphate plus sodium nitrate for two years caused the pH of the lake to increase. The efficiency of alkalinization was higher than for acidification, averaging 69% of the potential alkalinization of the supplied sodium nitrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185037
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  • 8
    Electronic Resource
    Electronic Resource
    A comparison of sequential extraction procedures for measuring phosphate rock residues in soils (1993)
    Springer
    Nutrient cycling in agroecosystems 35 (1993), S. 183-191 
    Details
    ISSN: 1573-0867
    Keywords: Indonesia ; MCP ; New Zealand ; phosphate rock dissolution ; phosphate rock residues ; soil pH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Laboratory studies have been undertaken to evaluate sequential extraction procedures to measure phosphate rock (PR) residues in a range of temperate (New Zealand) and tropical (Indonesian) soils. The amounts of soil and PR-P were measured by using a sequential procedure which involved pre-extraction with either 1M NaCl or 0.5M NaCl/TEA (pH 7), followed by 1M NaOH and mineral acids. The acids included varying concentrations of HCl or H2SO4 (0.5–4M) and a tri-acid mixture of HCl, HNO3 and HClO4 (5:5:7). Amounts of PR residues in the soil were estimated from increases in amounts of the acid-extractable P (Δacid-P) or Ca (Δacid-Ca) in the PR-treated over untreated soil. Amounts of PR-P residues (measured by ΔHCl-P) in New Zealand soils varying in pH and Ca levels were completely recovered (±5%) when the soils were pre-extracted with 0.5M NaCl/TEA, rather than 1M NaCl (or no pre-extraction). Pre-extraction of acid soil/PR mixtures with 1M NaCl caused dissolution of PR during the extraction. Although the ΔHCl-Ca also estimated the amount of PR residues well, particularly after a 0.5M NaCl/TEA pre-extraction, this method was less sensitive than the ΔHCl-P method, particularly in the soils with high native Ca saturation. In contrast to the high recovery obtained from the New Zealand soils, the recovery of the PR-P residues in the Indonesian soils in the HCl extracts following the 0.5M NaCl/TEA and 1M NaOH extractions were low ranging from 62 to 86%. Although increasing the concentration of HCl (upto 4M) did not cause any improvement in the recovery of PR-P, extraction with H2SO4 achieved complete recovery of PR-P. For all soils, a sequential extraction involving 0.5M NaCl/TEA-1M NaOH-0.5M H2SO4 is recommended for measuring PR residues in pairs of PR-treated and untreated field or laboratory incubated soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00750637
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  • 9
    Electronic Resource
    Electronic Resource
    Biological, chemical and physical responses of lakes to experimental acidification (1982)
    Springer
    Water, air & soil pollution 18 (1982), S. 259-271 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Changes in physical, chemical and biological factors were observed during a 5-yr experimental acidification study in Lake 223 of the Experimental Lakes Area, and compared to a 2 yr pre-acidification period. Significant changes included increased transparency, rates of hypolimnion heating and rates of thermocline deepening; increased concentrations of Mn, Na, Zn, Al, and chlorophyll; decreased concentrations of suspended C, total dissolved N, Fe and chloride; increases in Chlorophyta but decreases in Chrysophyta; the disappearance of the opossum shrimpMysis relicta and the fathead minnowPimephales promelas; the appearance of epidemics of the filamentous algaMougeotea; decreased fitness and decline in numbers ofOrconectes virilis; and increased embryonic mortality of the lake troutSalvelinus namaycush. Sulfur budgets for two lakes experimentally acidified with sulfuric acid reveal that an average of 1/4 to 1/3 of added sulfate is sedimented, presumably as FeS, reducing the efficiency of acidification. The sedimentation occurs under both oxic and anoxic conditions. The utility of whole-ecosystem mass balance studies of S in ‘experimental’ and ‘observational’ mass balance studies is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02419417
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  • 10
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    The Adsorption of Atrazine and Atratone by Anion- and Cation-Exchange Resins (1968)
    Wiley
    Details
    Publication Date: 1968-01-01
    Print ISSN: 0361-5995
    Electronic ISSN: 1435-0661
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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