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  • 1
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    Effects of macrobenthos on sediment-water oxygen and ammonium fluxes. Final Report. (2021)
    University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory | Solomons, MD
    In:  http://aquaticcommons.org/id/eprint/2840 | 130 | 2013-11-05 00:16:29 | 2840 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-06-29
    Description: Sediments are an important location in determining the fate of nutrients entering the estuary. Role of sediments needs to be incorporated into water quality models. Purpose of this study was to estimate the portion of sediment oxygen consumption (SOC) and sediment ammonium (NH4+) release directly attributable to benthic invertebrates via the respiratory use of oxygen and catabolic release of ammonium.Samples were collected at 8 locations from August 1985 through November 1988. (PDF contains 45 pages)
    Description: United States Army Corps of Engineers Waterways Experimental Station
    Description: University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Keywords: Ecology ; Chemistry ; Environment ; macrobenthos ; sediment ; oxygen ; Ammonium ; Fluxes ; respiration rates ; bivalve ; algorithms ; nitrogen excretion rates ; benthic ; macroinvertebrate ; Chesapeake Bay ; nutrients ; phytoplankton
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Microdomain dynamics in folding proteins (1982)
    New York : Wiley-Blackwell
    Biopolymers 21 (1982), S. 1275-1300 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The basic formulas for the incorporation into the diffusion-collision model of the stabilities of intermediate states on the folding pathway are derived and discussed. A hypothetical two-step folding pathway is calculated in detail. A model for the production of incorrectly folded intermediates is suggested and some numerical estimates made. Implications and future directions in the evolution of the model are discussed. Three appendices deal with some mathematical aspects of the model.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360210703
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  • 3
    Electronic Resource
    Electronic Resource
    Alternative pathways in diffusion-collision controlled protein folding (1984)
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 675-694 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The diffusion-collision model of protein folding has been solved exactly for a three-microdomain protein subunit. Numerical analysis shows that the exact kinetics may be excellently approximated in all cases studied by a standard chemical kinetics approach with the forward rate constants calculated from the mean folding time formula found previously.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360230408
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  • 4
    Electronic Resource
    Electronic Resource
    Brownian dynamics simulation of protein folding: A study of the diffusion-collision modelSupported in part by a grant from the National Science Foundation. (1987)
    New York : Wiley-Blackwell
    Biopolymers 26 (1987), S. 481-506 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dynamic aspects of protein folding are described by a series of diffusion-collision steps involving structural units (microdomains) of various sizes that combine to form the protein in its native state. A method is introduced for obtaining the rate constants for the basic diffusion-collision step by use of Brownian dynamics. The method is applied to an investigation of the folding dynamics of two α-helices connected by a flexible (random-coil) polypeptide chain. The results of this full three-dimensional treatment are compared with simplified model calculations for the diffusion-collision step. Of particular interest are the nature of the collision dynamics and the role of the intervening peptide chain.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360260404
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  • 5
    Electronic Resource
    Electronic Resource
    Relation between calculated amide frequencies and solution structure in Ala-X peptidesThe opinions or assertions contained herein are the private ones of the authors and are not to be construed as official or reflecting the views of the U.S. Department of Defense or the Uniformed Services University of the Health Sciences. (1990)
    New York : Wiley-Blackwell
    Biopolymers 30 (1990), S. 599-608 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Computational techniques have been used to aid interpretation of observed systematic shifts in the amide III frequencies of Ala-X peptides. Optimized structures and frequencies have been calculated for Ala-X peptides using GAUSSIAN86/88 with the 4-31G basis, MOPAC, and normal mode methods based on empirical force fields. We observe the following: (1) Frequencies calculated using scaled GAUSSIAN86 force constants correlate well with the experimental results. (2) Structures of the Ala-X peptides optimized by GAUSSIAN show a clear trend toward lower values of the dihedral angle φ as the X side chain becomes larger, while structures optimized here using semiempirical and empirical force fields do not show trends. (3) Computational changes in peptide conformations from β-sheet to α-helix produce large changes in both amide I and amide III frequencies that are inconsistent with the experimental results. (4) Computational changes in the dihedral angle φ of Ala-Ala produce a change in the amide III frequency consistent with the experimental results. (5) The experimental frequency shifts cannot be attributed directly to the effects of changing mass.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360300512
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  • 6
    Electronic Resource
    Electronic Resource
    Simulation of α-helix-coil transitions in simplified polyvaline: Equilibrium properties and brownian dynamics (1993)
    New York : Wiley-Blackwell
    Biopolymers 33 (1993), S. 1519-1535 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A quantitative understanding of helix-coil dynamics will help explain their role in protein folding and in folded proteins. As a contribution to the understanding, the equilibrium and dynamical aspects of the helix-coil transition in polyvaline have been studied by computer simulation using a simplified model of the polypeptide chain. Each amino acid residue is treated as a single quasiparticle in an effective potential that approximates the potential of mean force in solution. The equilibrium properties examined include the helix-coil transition and its dependence on chain position and well depth at the coil-helix interface. A stochastic simulation of the Brownian motion of the chain in its solvent surroundings has been used to investigate dynamical properties. Time histories of the dihedral angles have been used to study the behavior of the helical structure. Auto and cross-correlation functions have been calculated from the time histories and from the state (helix or coil) functions of the residues with relaxation times of tens to hundreds of picoseconds. Helix-coil rate constants of tens of ns-1 were found for both directions of the transition. © 1993 John Wiley & Sons, Inc.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360331004
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  • 7
    Electronic Resource
    Electronic Resource
    Chiral Ligands for Transition Metal Complexation (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 449-454 
    Details
    ISSN: 0009-2940
    Keywords: Chiral ligands ; Transition metal complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Novel chiral salen- or salphen-type ligands with stereogenic centres in the 1,3-dicarbonyl moiety 2 as well as in the amino bridge in 15-18 were synthesized from the enantiomerically pure Hajos-Wiechert ketone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280503
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  • 8
    Electronic Resource
    Electronic Resource
    Weighted intrinsic viscosity relationships for polysaccharide mixtures in dilute aqueous solutions (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 35 (1988), S. 1631-1637 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The weighted intrinsic viscosities of polysaccharide mixtures in dilute aqueous solutions have been studied. The purpose of this investigation is to demonstrate that average intrinsic viscosities would scale with the weight fraction of the individual components for polysaccharide mixtures in 0.5N NaOH(aq). The polysaccharides examined in this study were composed of polymers differing in their molecular weights, degree of branching, and bond linkages. Excellent agreement between theory and experiment was observed for the three different mixed polymer systems examined. This observation validates certain aspects of proposed theoretical treatments which employ this fundamental assumption and allows for further advances in experimental analytical developments of water-soluble polymer systems.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070350618
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  • 9
    Electronic Resource
    Electronic Resource
    The use of paper electrophoresis in studying the metabolism of pseudomonas species. I. ApparatusThis investigation represents a portion of a dissertation submitted by one of the authors (W. F. D.) in partial fulfillment of the requirements for the Ph.D. degree at the University of Kentucky (1962)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 4 (1962), S. 255-270 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The sandwich paper electrophoresis technique, such as that of Foster (1952b), was modified to permit routine examination of as many as 15 samples of materials such as bacterial cultures, simultaneously, and with greater rapidity than with paper chromatography techniques. By the use of borate buffer at pH 9.6 with aniline hydrogen oxalate for development, materials such as glucose, fructose, 2-ketogluconic acid, and 5-ketogluconic acid could be separated in three hours.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260040302
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  • 10
    Electronic Resource
    Electronic Resource
    Ribonuclease isolated from yeast (Saccharomyces carlsbergensis): Characterization and properties (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 23 (1981), S. 953-964 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The homogeneity of a purified ribonuclease from brewers' yeast was determined by velocity sedimentation and polyacrylamide gel electrophoresis techniques. The velocity sedimentation pattern gave a single peak with a Sapp 3.46 and polyacrylamide gel electrophoresis showed one major band. The absorption spectrum of the enzyme showed maximum absorption at 277-278 nm and minimum at 252 nm. The enzyme was relatively stable to extreme pH values and high temperature. Both NaCl and KCl increased the enzyme activity whereas enzyme was inhibited by divalent metal ions. The inhibition of the enzyme was increased in the order of Ca2+ 〉 Mg2+ 〉 Fe2+Cu2+. Chemical modification studies of the enzyme showed that tryptophan residues and disulfide bonds were required for enzyme activity.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260230505
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