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  • 2000-2004  (1)
  • 1995-1999  (3)
  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    The virial coefficients of the pearl-necklace model (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 10398-10409 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We consider the virial coefficients of an idealized model polymer under good solvent conditions, the so-called pearl-necklace model, consisting of a fully flexible chain of m tangent hard spheres. We employ an efficient algorithm recently proposed to determine the second, third, and fourth virial coefficients of chains of up to 100 monomers. We also include some preliminary results for chains of up to 200 monomers. These results, which include the first off-lattice calculations of third and fourth virial coefficients of polymer models, are compared with predictions obtained from Wertheim's equation of state. It is shown that, despite the good agreement of Wertheim's equation of state for the compressibility factor, the predictions for the individual virial coefficients are far from satisfactory. It it shown that for the values of m considered in this work, the truncated virial expansion correctly describes the equation of state up to packing fractions of 0.25. A new equation of state which describes the low and high density regimes of the pearl-necklace model is proposed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1322637
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  • 2
    Electronic Resource
    Electronic Resource
    Host range of Acremonium cucurbitacearum, cause of Acremonium collapse of muskmelon (1998)
    Oxford, U.K. and Cambridge, USA : Blackwell Publishers
    Plant pathology 47 (1998), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The pathogenicity of Acremonium cucurbitacearum to 31 cucurbits, 18 crop plant species, and 15 weed species was evaluated under greenhouse conditions. This study demonstrates that many other cucurbits in addition to muskmelon and watermelon can potentially serve as hosts of A. cucurbitacearum. Using a disease severity index (DSI), all muskmelon and watermelon cultivars were ranked as susceptible or highly susceptible, with the exception of honeydew cultivar TAM Dew Improved, which ranked resistant in one study. Highly resistant cucurbits included Cucurbita maxima (autumn squash), Luffa acutangula, L. aegyptiaca (sponge gourd) and Benincasa hispida (ash gourd). Cyclanthera pedata and Cucumis miriocarpus were rated as resistant. The percentage recovery of A. cucurbitacearum ranged from 8% to 100% and tended to be higher in plants with a higher DSI. Other crops and weed species common to muskmelon production fields are not likely to be involved in the perpetuation or propagation of the fungus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.1998.00199.x
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  • 3
    Electronic Resource
    Electronic Resource
    Ontogenesis of alpha-amylase in rat parotid gland during postnatal development (1981)
    Springer
    Histochemistry and cell biology 71 (1981), S. 125-133 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Changes in α-amylase (α-1,4-glucan-4-glucanohydrolase, EC 3.2.1.1) of parotid gland were investigated during postnatal development of the rat. Modifications in amylase activity after birth allow the distinction of three stages which can be correlated with the morphologic development of the parotid gland. Significant sexual differences in the evolution of α-amylase activity were found. During the first stage (from birth to the 20th day) there is a higher increase in females, while males have a more pronounced increment in the second stage (from the 20th to the 30th day). By means of gel electrophoresis of parotid extracts, four molecular forms of amylase can be separated. The slowest migrating band (Form 1) is not detected at the initial stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00592576
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  • 4
    Electronic Resource
    Electronic Resource
    Unusual Longevity Without Surgical Intervention in Complete Transposition of the Great Arteries (1998)
    Springer
    Pediatric cardiology 19 (1998), S. 358-360 
    Details
    ISSN: 1432-1971
    Keywords: Key words: Transposition of great arteries —Longevity — Adulthood
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. A case of unusual longevity to the age of 58 years is reported for a female patient with complete transposition of the great arteries. The association with a wide atrial septal defect with intact interventricular septum may have contributed to the long survival without surgery. Factors determining intercirculatory mixing and systemic oxygen saturation may be the high pulmonary flow, the location of the anatomic communication, sufficient hemoglobin concentration to allow an adequate level of systemic resistance and recirculated systemic flow, and the belated development of pulmonary vascular disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002469900323
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of sexual steroids upon ontogeny of alpha-amylase of rat parotid gland (1982)
    Springer
    Molecular and cellular biochemistry 44 (1982), S. 65-69 
    Details
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of gonadectomy (at the 10th day of life) and treatment with sexual steroids (during the first month) upon development of alpha-amylase activity in rat parotid gland has been studied. Alpha-amylase specific activity of parotid glands from 20-day-old orchidectomized rats and from 25-day-old ovariectomized animals was significantly higher than that of intact male and female rats of the same age respectively. Spayed males treated with testosterone (10 μg/day on the 13th, 15th, and 17th day) and ovariectomized rats treated with oestradiol (2.5 μg/day from the 16th to the 22nd day) showed values of enzymic activity similar to those of normal animals. Results indicate that oestradiol and testosterone have an inhibitory effect upon the increase of alpha-amylase activity in parotid gland during a very defined period of development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226891
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  • 6
    Electronic Resource
    Electronic Resource
    Bibliometric study on vaccines (1990–1995) part I: Scientific production in Iberian-American countries (1998)
    Springer
    Scientometrics 43 (1998), S. 189-205 
    Details
    ISSN: 1588-2861
    Source: Springer Online Journal Archives 1860-2000
    Topics: Information Science and Librarianship , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract Analysis of scientific production is made in the domains of vaccines for the period 1990–1995, including eight Iberian-American countries. To attain the results, different indicators were applied such as: collaboration rate, activity index and representation techniques, using a cluster analysis and multidimensional scaling. Similarities between countries are represented according to their activity index in the subject field. Results show a discontinuity in the scientific production over the years, where each country has a peculiar behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458407
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