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  • 1
    Electronic Resource
    Electronic Resource
    Far-infra-red Spectra of some Square-planar Ions (1965)
    [s.l.] : Nature Publishing Group
    Nature 208 (1965), S. 283-283 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] (1) The site symmetry of [PtCl4]2- in the potassium salt is the same as that of the free ion. It is thus difficult to account for the triplet nature attributed to v7 by Mathieu et al. (2) The band near 110 cm.-1 assigned by Mathieu et al. to v2 is absent in the spectrum of Magnus's green salt, and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/208283a0
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  • 2
    Electronic Resource
    Electronic Resource
    A field-oriented competition index for young jack pine plantations and a computerized decision tool for vegetation management (1991)
    Springer
    New forests 5 (1991), S. 93-107 
    Details
    ISSN: 1573-5095
    Keywords: Boreal mixedwood ; on-site evaluation ; Pinus banksiana ; tending-decision software
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A field-oriented competition index (Shade Index) was developed using a series of mensurational measurements on competitors surrounding individual jack pine seedlings. This index and accompanying software were developed for a hand-held microprocessor, allowing for on-site evaluations. The Shade Index estimates the percent occupancy of competitor crowns overtopping individual jack pine seedlings within a 1.4 m radius of the subject tree. Using 360 crop treecentred plots situated on six four-year-old plantations, the accuracy of the index was tested against a more complex competition index (Total Canopy Cover) obtained from vertical hemispherical photographs. Both of these indices attempt to quantify the amount of light being intercepted by competitors. A relationship was found to exist between these two indices with Pearson correlation coefficients ranging from 0.82 to 0.90. Linear regression models of seedling diameter regressed against the Shade Index for the different site/stock type combinations are presented. All models were significant at greater than p=0.0001, with coefficients of determination ranging from 0.42 to 0.71. This index was incorporated into software for a hand-held microprocessor to allow on-site evaluation. These evaluations have the potential to be used to set tending priorities or assess vegetation control measures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029301
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Release of corrosion products by F-75 cobalt base alloy in the rat. II: Morbidity apparently associated with chromium release in vivo: A 120-day rat studyThis article was presented in part at the 29th Annual Meeting of the Orthopedic Research Society, Anaheim, CA, March 8, 1983. Revised and resubmitted to Journal of Biomedical Materials Research 1985 (1986)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 20 (1986), S. 219-233 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: There is concern whether in vivo corrosion of chromium-cobalt alloys releases ions containing trivalent [Cr(III)] or hexavalent [Cr(VI)] chromium. The question arises from indications that Cr(VI) is far more biologically active than Cr(III). Using a previously developed microsphere implant model, specimens of F-75 chromium-cobalt-molybdenum alloy were implanted in rats for periods up to 120 days. Blood and urine were collected at intervals during the study. Significant postoperative serum and urine chromium concentration elevations were observed. In addition, weight gain inhibition, lung morbidity, and animal mortality, related to the implant surface area to animal body weight ratio (SA/BW), were observed. Comparison of measured chromium serum concentrations with those concentrations found by others to be biologically active in tissue culture studies strongly suggests the release of Cr(VI) in this study.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820200211
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  • 4
    Electronic Resource
    Electronic Resource
    Release of corrosion products by F-75 cobalt base alloy in the rat. III: Effects of a carbon surface coating (1987)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 21 (1987), S. 1213-1230 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A pyrolytic carbon coating was applied to F-75 chromium-cobalt-molybdenum alloy in an effort to reduce the release of corrosion products in vivo. After intramuscular implantation in the rat, a complex pattern of serum and urine concentration elevations of chromium, cobalt, and nickel was seen. The carbon-coated implants released more chromium and cobalt than uncoated controls, as seen by significantly elevated metal concentrations in serum and urine. Animals receiving carbon-coated implants showed a high rate of recurrent implant site inflammation. Neoplastic infiltration of the implant site occurred in 3 out of 24 animals with coated implants, but not in any of the 16 animals which received either uncoated F-75 microsphere or poly(ethylene) particulate implants.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820211005
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