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  • 1
    Electronic Resource
    Electronic Resource
    U3 snRNPs and nucleolar development during oocyte maturation, fertilization and early embryogenesis in the mouse: U3 snRNA and snRNPs are not regulated coordinate with other snRNAs and snRNPs
    Amsterdam : Elsevier
    Developmental Biology 138 (1990), S. 247-255 
    Details
    ISSN: 0012-1606
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0012-1606(90)90195-O
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  • 2
    Electronic Resource
    Electronic Resource
    Chest pain self-management training for patients with coronary artery disease
    Amsterdam : Elsevier
    Journal of Psychosomatic Research 38 (1994), S. 409-418 
    Details
    ISSN: 0022-3999
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine , Psychology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3999(94)90102-3
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  • 3
    Electronic Resource
    Electronic Resource
    Nuclear transplantation in bovine embryos
    Amsterdam : Elsevier
    Theriogenology 25 (1986), S. 189 
    Details
    ISSN: 0093-691X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0093-691X(86)90243-8
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  • 4
    Electronic Resource
    Electronic Resource
    Sulfuric acid and leaching requirements for reclaiming sodium-affected calcareous soils (1975)
    Springer
    Plant and soil 43 (1975), S. 573-585 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The changes in exchangeable sodium and total dissolved salts due to the application of sulfuric acid and water to sodium-affected calcareous soils were studied for the purpose of establishing a convenient way of determining acid and leaching water requirements. Conventional methods which ignore the effect of sodium removed from soil exchange sites are inadequate for estimating amounts of acid needed to obtain a desired level of exchangeable sodium, especially at high acid application rates. Modified equations are presented which predict the changes in exchangeable sodium and total dissolved salts using essentially the same input data needed for conventional methods, and appear advantageous for estimating acid and leaching water needs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01928520
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  • 5
    Electronic Resource
    Electronic Resource
    Sulfuric acid and leaching requirements for reclaiming sodium-affected calcareous soils (1975)
    Springer
    Plant and soil 43 (1975), S. 573-585 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The changes in exchangeable sodium and total dissolved salts due to the application of sulfuric acid and water to sodium-affected calcareous soils were studied for the purpose of establishing a convenient way of determining acid and leaching water requirements. Conventional methods which ignore the effect of sodium removed from soil exchange sites are inadequate for estimating amounts of acid needed to obtain a desired level of exchangeable sodium, especially at high acid application rates. Modified equations are presented which predict the changes in exchangeable sodium and total dissolved salts using essentially the same input data needed for conventional methods, and appear advantageous for estimating acid and leaching water needs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01928520
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of sulfuric acid on sodium-hazard of irrigation water (1976)
    Springer
    Plant and soil 44 (1976), S. 715-721 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The sodium adsorption ratio (SAR), exchangeable sodium percentage (ESP) and saturated hydraulic conductivity were measured under laboratory conditions in one neutral and four calcareous soils using simulated alkaline irrigation waters having salt concentrations ranging from 7 to 39 meq/l with the SAR from 3.8 to 8.4. Sulfuric acid was applied to the waters at sufficient rates to prevent calcium precipitation under an open system, ranging from 2.1 to 4.7 meq/l. At these acid rates, the pH of irrigation waters remained above neutral. This treatment reduced SAR and ESP in all cases tested, and increased the hydraulic conductivity of some soils when the SAR of the original irrigation waters was greater than approximately 7. The experimentally determined SAR was then compared with the values predicted based on some of the existing theories. The results indicated that the conventional method to estimate SAR with adjustment using the pHC index of Langelier overestimates the effect of HCO3 -, whereas the equation based on carbonate equibria gives a reasonable prediction of SAR in waters containing HCO3 - as well as H2SO4. The SAR calculated by the latter method was also linearly related to the measured ESP with an equation, ESP=0.761 SAR, r2=0.986.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011390
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  • 7
    Electronic Resource
    Electronic Resource
    A thermodynamic method of predicting the transport of steroids in polymer matrices (1975)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 21 (1975), S. 1073-1080 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Application of Hildebrand's theory of the solubility of microsolutes in ordinary solvents, and of the Flory-Huggins theory to the solubility of steroids in polymers, has permitted the derivation of a predictive correlation between polymer permeability and steroid crystalline melting temperature, other correlating parameters being the entropy of fusion of the steroid and the (computed) solubility parameters of steroid and polymer. The correlation permits prediction of the permeability of any steroid in any polymer with reasonable accuracy.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690210605
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  • 8
    Electronic Resource
    Electronic Resource
    Construction of the nuclear matrix at the transition from maternal to zygotic control of development in the mouse: An immunocytochemical study (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 32 (1992), S. 203-208 
    Details
    ISSN: 1040-452X
    Keywords: DNA ; RNA ; P1 ; PI1 ; PI2 ; Lamin B ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The nuclear matrix is thought to be responsible for DNA organization, DNA replication, RNA synthesis, and RNA processing. We have looked for the presence of nuclear matrix antigens during early mouse embryogenesis. Antibodies to peripheral and interior antigens (P1, PI1, PI2, and lamin B) were used to immunolocalize nuclear matrix antigens in germinal vesicle oocytes, metaphase II oocytes, zygotes, two-cell-stage embryos, and eight-cell stage embryos. All antibodies reacted with the nuclei of germinal vesicle oocytes, and two- and eight-cell-stage embryos; however, only P1 and lamin B were present at the pronuclear stage. In eggs collected at the pronuclear stage and cultured to the late two-cell stage in the presence of α-amanitin, the matrix morphology was altered for PI1 and PI2. α-Amanitin had no affect on the distribution of P1 or lamin B antigens. If α-amanitin was added 2 hr after cleavage to the two-cell stage, the normal staining pattern of PI2 was retained. These results suggest that the presence of specific components of an internal matrix is correlated with normal genomic activity.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080320304
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  • 9
    Electronic Resource
    Electronic Resource
    Artificial activation of porcine oocytes matured in vitro (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 28 (1991), S. 405-409 
    Details
    ISSN: 1040-452X
    Keywords: Nuclear transfer ; Pronuclear formation ; Glucosamine ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: These studies were undertaken to understand the biological basis of artificially induced activation of meiotic metaphase II oocytes and to develop a source of oocytes as recipients for cloning by nuclear transfer. In vitro matured porcine oocytes were pulsed with various voltages of electricity and evalulated for pronuclear formation. The percentage of eggs that activated was significantly greater for the higher voltages. The effect on activation of the temperature of the ovaries returning from the abattoir was evaluated and it was found that oocytes derived from ovaries returning at 29°C activated at lower rates (45.5%) than those returning at 36°C (78.9%). An experiment was designed to evaluate the pH of electroporation medium (EM) and the duration of exposure to EM on activation. Oocytes were placed in EM at various pHs for 5 minutes, pulsed, and immediately removed to TL-Hepes or allowed an additional 2 minutes in EM prior to rinsing in TL-Hepes. The results indicate an optimum activation rate at a pH of 7.0 and allowing the additional 2 minutes in EM. Additional glucosamine (5 mM) had no affect on development of the oocyte to metaphase but reduced the percent pronuclear formation from 61% and 47%. A final experiment evaluated the developmental competence of oocytes subjected to a optimum combination of the above treatments and illustrated that a significant portion of the activated oocytes can show limited signs of cleavage. Thus in vitro matured pig oocytes can be induced to activate at high rates.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080280413
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  • 10
    Electronic Resource
    Electronic Resource
    Alanine and leucine transport in unfertilized pig oocytes and early blastocysts (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 34 (1993), S. 250-254 
    Details
    ISSN: 1040-452X
    Keywords: Zwitterionic amino acids ; Oocytes ; Blastocysts ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Amino acid transport is facilitated by specific transporters within the plasma membrane of the cell. In mouse oocytes and cleavage-stage conceptus Na+-dependent L-alanine and L-leucine transport are nearly undetectable. Sodium-dependent transport via system BO,+ in the mouse conceptus increases greatly between the 8-cell and blastocyst stages. By contrast, data presented here for the pig show that L-alanine and L-leucine transport is mainly Na+-dependent in the oocyte; this Na+-dependent component of transport becomes undetectable by the blastocyst stage. The Na+-dependent component of transport in oocytes is inhibited by BCH (2-aminoendo-bicyclo[2.2.1] hexane-2-carboxylic acid) and L-lysine and thus could be a form of system BO,+. In both oocytes and blastocysts Na+-independent L-leucine transport is inhibited by BCH, which is consistent with the presence of system L. The dramatic decrease in Na+-dependent amino acid transport activity could occur in pig conceptuses in association with the onset of RNA synthesis during the 4-cell stage. Regardless of the precise time during development at which it occurs, however, this dramatic, developmentally regulated decrease in Na+-dependent alanine and leucine transport activity contrasts sharply with the large increase in Na+-dependent system BO,+ activity that occurs during preimplantation development of murine conceptuses. Elucidation of the molecular mechanisms by which these changes occur should contribute to an understanding of regulation of gene expression during early development. © 1993 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080340304
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