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  • Cell & Developmental Biology  (15)
  • Organic Chemistry  (10)
  • bioleaching  (3)
  • Wiley-Blackwell  (28)
  • 1
    Electronic Resource
    Electronic Resource
    Electron spin resonance study on radicals stabilized by the σ-π captodative effect1 (1988)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 1 (1988), S. 197-207 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: ESR spectra of l-cyano-2-(trimethylsilyl)ethyl and related radicals were recorded. Temperature dependent ESR spectra of these radicals revealed that electron-releasing trimethylsilylmethyl and electron-withdrawing cyano groups synergetically functioned to stabilize the radical centers due to σ-π captodative effects.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610010404
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and isolation of 2-methylamino-3-phenylpropanoic acid enantiomers using selective crystallization (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 9 (1997), S. 386-389 
    Details
    ISSN: 0899-0042
    Keywords: optical resolution ; diastereomeric method ; molecular compound ; 2-chloro-3-phenylpropanoic acid ; 2-methylamino-3-phenylpropanoic acid ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: First, (RS)-2-chloro-3-phenylpropanoic acid [(RS)-CPP] was optically resolved using ethyl (S)-phenylalaninate as a resolving agent, aiming at preparation of optically active 2-methylamino-3-phenylpropanoic acid (MPP). The (R)-CPP obtained as the sodium salt monohydrate was reacted with methylamine to give (S)-2-methylamino-3-phenylpropanoic acid [(S)-MPP]. Next, the optical resolution of (RS)-MPP was also attempted via molecular compound formation with optically active mandelic acid (MAN). The molecular compound of (R)-MPP with (S)-MAN [(R)-MPP (S)-MAN] was obtained as the less soluble diastereomeric compound, while the (S)-MPP (S)-MAN compound was found to be the more soluble one. Recrystallization of (R)-MPP (S)-MAN compound from water, followed by treatment with acetone, gave optically pure (R)-MPP in 79% yield, based on a half amount of the starting (RS)-MPP. The (S)-MPP obtained from (S)-MPP (S)-MAN compound was again subjected to formation of molecular compound with (R)-MAN to give optically pure (S,)-MPP in 66% yield. Chirality 9:386-389, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Structural studies of halogen adducts of some cyclic selenides and tellurides by 1H, 13C, 77Se and 125Te NMR. Evidence for the formation of molecular complexes of selenoxanthone and selenanthrene with bromineFor a preliminary contribution, see Ref. 1. (1990)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 3 (1990), S. 369-374 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 1H, 13C, 77Se and 125Te NMR spectra were recorded for selenoxanthone (1a), telluroxanthone (2a), selenanthrene (3a), related compounds and their halogen adducts to elucidate the structure of the adducts in solutions. Although selenides react with bromine to give trigonal bipyramidal (TB) hypervalent complexes in general, 1a reacted with bromine to yield a molecular complex (MC). Its chlorine adduct was found to be a TB. The effective electronegativity of selenium in 1a may be modulated by conjugation with the strongly electron-withdrawing carbonyl group. In the case of 2a, its halogen adducts were TBs. The structure of the bromine adduct of 3a was also demonstrated to be an MC from NMR data.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610030604
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  • 4
    Electronic Resource
    Electronic Resource
    Collection of acrosome-reacted human sperm using monoclonal antibody-coated paramagnetic beads (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 32 (1992), S. 389-393 
    Details
    ISSN: 1040-452X
    Keywords: Sperm penetration assay ; Binding ; Fertilizing ability ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: A monoclonal antibody (MAb) against human acrosome-reacted sperm was attached to paramagnetic polystyrene beads. Human sperm prepared by the swim-up method were (1) incubated in m-BWW, (2) incubated and ionophore treated, or (3) incubated with 5% seminal fluid. After treatment, sperm were mixed with the beads and incubated for 1 hr. Variously treated sperm showed different binding abilities to the beads. Sperm bound to the beads were collected by a magnet and subjected to triple staining. Most of the collected sperm were acrosome reacted. The results suggested that the beads can be used to estimate the acrosomal status of sperm, and that the use of antibody-coated paramagnetic beads provides a convenient way of collecting acrosome-reacted sperm. The acrosomal status detected by the beads was also compared with the ability of sperm to fuse with zonafree hamster eggs. It was found that greater bead-binding ability correlated with more sperm fusing with zona-free hamster eggs.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080320413
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  • 5
    Electronic Resource
    Electronic Resource
    Inhibition of flagellar motility of fowl spermatozoa by L-carnitine: Its relationship with respiration and phosphorylation of axonemal proteins (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 38 (1994), S. 318-325 
    Details
    ISSN: 1040-452X
    Keywords: Demembranated Sperm ; Dynein ; Calcium ; Oxygen consumption ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The action of carnitine in regulating fowl sperm motility was investigated. As the concentration of L-carnitine was increased (0-20 mM), the motility of intact and demembranated fowl spermatozoa was reduced at 30°C. Even the presence of 1 mM CaCl2 before the addition of 10 mM carnitine could not prevent the inhibition of motility at 30°C and 40°C. However, motility was restored by reducing the concentrations of carnitine. Carnitine also inhibited the oxygen consumption and ATP concentrations of intact spermatozoa, and caused a reduction in intracellular free Ca2+ concentrations. Phosphorylation of a 50 kDa protein and dephosphorylation of 24 kDa and 30 kDa proteins of demembranated spermatozoa were observed after the addition of carnitine. In contrast, the flagellar ATPase activity of crude dynein extract was not affected by the addition of carnitine. These results suggest that inhibitory effect of carnitine for motility may be directly on the axonemal phosphoproteins, but not directly on the dynein ATPase activity. The physiological role of carnitine for fowl spermatozoa in the ductus deferens is discussed. © 1994 Wiley-Liss, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080380313
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  • 6
    Electronic Resource
    Electronic Resource
    Development of androgenetic mouse embryos produced by in vitro fertilization of enucleated oocytes (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 34 (1993), S. 43-46 
    Details
    ISSN: 1040-452X
    Keywords: Androgenetic eggs ; Enucleation ; Mouse oocytes ; In vitro fertilization ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Enucleated mouse oocytes were successfully fertilized in vitro, and the resultant androgenetic eggs developed to the blastocyst stage. The proportion of enucleated oocytes fertilized in vitro was high (87-99%) at sperm concentrations ranging from 10-100 × 104/ml. At high sperm concentrations (100-1,000 × 104), 35-45% of the fertilized eggs resulted in heterozygous bispermic androgenones. The proportion of hemizygous haploid and heterozygous diploid androgenones developing to blastocysts was 11% and 43%, respectively. Hemizygous diploidization, however, showed no positive effect on development. These results clearly show that the procedure reported here is efficient and reliable for the production of androgenetic eggs. © 1993 Wiley-Liss, Inc.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080340107
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  • 7
    Electronic Resource
    Electronic Resource
    Bioleaching of pyrite by acidophilic thermophile Acidianus brierleyi (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 48 (1995), S. 592-600 
    Details
    ISSN: 0006-3592
    Keywords: Acidianus brierleyi ; pyrite ; bioleaching ; acidophilic thermophile ; metal recovery ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The kinetics of bioleaching of pyrite (FeS2) by the acidophilic thermophilic bacterium Acidianus brierleyi was studied in a well-mixed batch reactor. Experiments were done at 65°C and pH 1.5 on adsorption of A. brierleyi onto pyrite particles, liquid-phase oxidation of ferrous iron by A. brierleyi, and microbial leaching of pyrite. The adsorption of A. brierleyi was a fast process; equilibrium was attained within the first 30 min of exposure to pyrite. The adsorption equilibrium data were well correlated with the Langmuir isotherm. The oxidation of ferrous iron was markedly accelerated in the presence of A. brierleyi, and the growth yield on ferrous iron was determined. The bioleaching of pyrite by A. brierleyi was found to take place with a direct attack by adsorbed cells on the surface of pyrite, the chemical leaching of pyrite by ferric iron being insignificant. Rate data collected under a wide variety of operating variables were analyzed to determine kinetic and stoichiometric parameters for the microbial pyrite leaching. The specific growth rate on pyrite for A. brierleyi was about four times that for the mesophilic bacterium, Thiobacillus ferrooxidans, whereas the growth yields on pyrite for the two microbes were approximately equal to one another in magnitude. A comparison of A. brierleyi with T. ferrooxidans for pyrite leachability demonstrated the thermophile to be much more effective. © 1995 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260480606
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  • 8
    Electronic Resource
    Electronic Resource
    Bioleaching of zinc sulfide concentrate by Thiobacillus ferrooxidans (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 39 (1992), S. 66-74 
    Details
    ISSN: 0006-3592
    Keywords: bioleaching ; adsorption ; growth kinetics ; Thiobacillus ferrooxidans ; zinc sulfide ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The kinetics of the bioleaching of ZnS concentrate by Thiobacillus ferrooxidans was studied in a well-mixed batch reactor. Experimental studies were made at 30°C and pH 2.2 on adsorption of the bacteria to the mineral, ferric iron leaching, and bacterial leaching. The adsorption rate of the bacteria was fairly rapid in comparison with the bioleaching rate, indicating that the bacterial adsorption is at equilibrium during the leaching process. The adsorption equilibrium data were correlated by the Langmuir isotherm, which is a useful means for predicting the number of bacteria adsorbed on the mineral surface. The rate of chemical leaching varied with the concentration of ferric iron, and the first-order reaction rate constant was determined. Bioleaching in an iron-containing medium was found to take place by both direct bacterial attack on the sulfide mineral and indirect attack via ferric iron. In this case, the ferric iron was formed from the reaction product (ferrous iron) through the biological oxidation reaction. To develop rate expressions for the kinetics of bacterial growth and zinc leaching, the two bacterial actions were considered. The key parameters appearing in the rate equations, the growth yield and specific growth rate of adsorbed bacteria, were evaluated by curve fitting using the experimental data. This kinetic model allowed us to predict the liquid-phase concentrations of the leached zinc and free cells during the batch bioleaching process.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260390111
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of yeast extract supplementation in leach solution on bioleaching rate of pyrite by acidophilic thermophile Acidianus brierleyi (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 58 (1998), S. 663-667 
    Details
    ISSN: 0006-3592
    Keywords: Acidianus brierleyi ; pyrite ; bioleaching ; acidophilic thermophile ; yeast extract ; organic supplement ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The bioleaching rate of pyrite (FeS2) by the acidophilic thermophile Acidianus brierleyi was studied at 65°C and pH 1.5 with leach solutions supplemented with yeast extract. In the absence of yeast extract supplementation, A. brierleyi could grow autotrophically on pyrite, and the leaching percentage of pyrite particles (25-44 μm) reached 25% for 7 d. The bacterial growth and consequent pyrite oxidation were enhanced by the addition of yeast extract between 0.005 and 0.25% w/v: the pyrite particles were completely solubilized within 6 d. The bioleaching rate was enhanced by a factor of 1.5 when the yeast extract concentration was changed from 0.005 to 0.05% w/v. However, there was only a slight effect on the leaching rate at the yeast extract concentrations of 0.05 to 0.25% w/v, suggesting that the organic supplement level was in large excess in the pyrite bioleaching. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 58: 663-667, 1998.
    Additional Material: 4 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Growth effect of lithium on mouse mammary epithelial cells in serum-free collagen gel culture (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 117 (1983), S. 290-296 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The effect of lithium on the growth of mammary epithelial cells from adult virgin and midpregnant BALB/c or BALB/cfC3H mice was tested in a serum-free collagen gel culture system. The serum-free medium consisted of a 1:1 mixture of Ham's F12 and Dulbecco's Modified Eagle's medium supplemented with insulin, transferrin, cholera toxin, epidermal growth factor (EGF), and bovine serum albumin fraction V (BSA V). A multifold increase in cell number occurred during 10-12 days of culture in this medium. In dose-response studies in which the concentration of each component of this serum-free medium was varied in turn, the addition of LiCL (10 mM) enhanced growth at most concentrations of each factor. However, LiCL could not enhance growth in the absence of insulin or BSA V, but could replace EGF. The optimal concentration of LiCl was 5-10 mM; higher concentrations (20-80 mM) were toxic. KCl (1-10 mM) when added to the serum-free medium slightly stimulated growth; the addition of NaCl to the medium had little effect on growth. LiCl did not enhance the growth of cells from spontaneous mammary tumors of BALB/cfC3H mice.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041170303
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