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  • 1
    Electronic Resource
    Electronic Resource
    A mechanism for framboid formation as illustrated by a volcanic exhalative sediment (1982)
    Springer
    Mineralium deposita 17 (1982), S. 23-36 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A sequence of oxidate facies sediments associated with a cupriferous massive sulphide deposit in the Solomon Islands is the product of precipitation at an exhalative fluid/seawater interface. A siliceous sinter bed within the sediments contains magnesioferrite spheroids having a distinctive framboid texture. Scanning electron micrographs of the spheroids show an internal structure of parallel rods composed of sub-spherical microcrysts. The formation of the magnesioferrite framboid texture is ascribed to the coagulation of magnetic iron hydroxide gel particles due to magnetic attraction but facilitated by the presence of a strong electrolyte. By analogy a simple mechanism to account for pyrite framboid formation is proposed. This mechanism requires primary iron sulphide particels to be attracted to one another because of the ferrimagnetic properties of a precursor FeS polymorph or alternatively by Van der Waals forces accentuated by the presence of charged ions in a strong electrolyte. Ordering of resultant microcrysts is mainly a close-packing effect which produces robust aggregates resistant to deformation during subsequent diagenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206374
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  • 2
    Electronic Resource
    Electronic Resource
    Manganese oxide mineralogy in an exhalative environment from the Solomon Islands (1983)
    Springer
    Mineralium deposita 18 (1983), S. 113-125 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The mineralogy and chemistry of oxidate facies sediments associated with a Solomon Island cupriferous pyrite deposit are described. Systematic variations in sediment composition are consistent with the gradual imposition of an oxidising environment on a pool of exhaled solution lying in a topographic depression on the sea floor. Manganese is first precipitated in the Mn2+ oxidation state as pyrochroite, γMn(OH)2. With later seafloor weathering and diagenesis, this oxidises initially to the Mn3+ intermediate minerals manganite (γMnO.OH) or, in the presence of iron hydroxides, to groutite (αMnO.OH). Subsequently, these oxidise further to Mn4+ as the βMnO2 dimorphs pyrolusite or ramsdellite, respectively. Todorokite (δMnO2) is indicative of more oxidising conditions and is found in the upper horizons of the manganiferous sediment. It is invariably non-stoichiometric in composition and its Mn2+/Mn4+ ratio is a direct function of the Eh prevailing during its precipitation. Adsorption of Na+, K+, Ca2+ and Ba2+ions at the time of formation stabilises the todorokite structure and provides an explanation for its persistence (with its Mn2+ions) in association with the completely oxidised Mn4+ mineral, βMnO2, pyrolusite. The enrichment of Cu, Zn and Pb in manganiferous sediments from both pelagic and exhalative environments is associated with the occurrence of goethite. The enrichment of K, Ba and Ca in manganiferous sediments from a similar range in environments is associated with the occurrence of todorokite. Both the mineralogy and trace element characteristics of a manganiferous sediment are thus a function of the environment of deposition rather than the ultimate source of the metals concerned. The trace element contents of manganiferous “floaters” should therefore only be used as an indicator of related sulphide mineralisation in the presence of other favourable factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206699
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  • 3
    Electronic Resource
    Electronic Resource
    A mechanism for framboid formation — The role of bacteria. A reply to Dr. S. I. Kalogeropoulos and a further contribution (1983)
    Springer
    Mineralium deposita 18 (1983), S. 129-130 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206701
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  • 4
    Electronic Resource
    Electronic Resource
    Neonatal hyperparathyroidism (1984)
    Springer
    European journal of pediatrics 142 (1984), S. 135-136 
    Details
    ISSN: 1432-1076
    Keywords: Neonatal hyperparathyroidism ; Total parathyroidectomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We describe a girl with congenital hyperparathyroidism who presented soon after birth with respiratory distress, hypotonia, feeding difficulties, and bone deformities. Hypercalcaemia, hypophosphataemia, and raised alkaline phosphatase were present and plasma parathyroid hormone levels measured by radioassay and bioassay were raised. X-rays showed gross demineralisation with metaphyseal fractures, erosions, and sub-periostal reaction along the bones. Following surgical removal of four hyperplastic parathyroid glands and subsequent maintainance therapy with 1-alpha-hydroxycholecalciferol there has been virtually complete reversal of her bone abnormalities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00445595
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  • 5
    Electronic Resource
    Electronic Resource
    Bone loss in the Beagle tibia: Influence of age, weight, and sex (1981)
    Springer
    Calcified tissue international 33 (1981), S. 233-238 
    Details
    ISSN: 1432-0827
    Keywords: Osteopenia ; Tibia ; Aging ; Beagles ; Bone mineral analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary In a cross-sectional study, 154 Beagles (79 males, 74 females) ranging in age from 14 to 187 months were measured for bone mineral, bone width, and mineral-to-width ratio on the distal shaft of the right tibia using a photon absorptiometer. The measurements were evaluated with regard to age, sex and body weight. The results indicate that males were heavier than females in body weight, with weight being reduced in the older animals of both sexes. When compared on an age basis, males had more mineral, a wider tibia, and a greater mineral-to-width ratio than females. The males and females reach their peak mineral, and mineral-to-width ratio at about 6 years of age and then decline. On a body weight basis, mineral, width and mineral-to-width ratio all increase with increasing body weight, with bone width being the least affected by changes in body weight. The values for females are less than those for males in all parameters with the greatest differences occurring at the greater weights. The only variance from these observations was the greater mineral-to-width ratio in the lighter females. It is concluded that, when examining cortical bone, the Beagle is a model of age-related osteopenia, and body weight is an important consideration when explaining changes in bone mineral.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02409442
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Allenic suicide substrates. New inhibitors of vitamin B6 linked decarboxylases (1984)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 106 (1984), S. 2734-2735 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00321a062
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  • 7
    Electronic Resource
    Electronic Resource
    Anaesthesia for carotid artery surgery (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 35 (1980), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Twenty-one carotid endarterectomies were performed on 18 patients anaesthetised using droperidol, fentanyl and a cervical plexus block. This technique permitted testing for motor function during carotid clamping, and allowed the operation to proceed safely without a shunt in the majority of patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1980.tb05091.x
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  • 8
    Electronic Resource
    Electronic Resource
    Latent infection of winter oilseed rape by Leptosphaeria maculans (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 32 (1983), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Plants of oilseed rape, cultivars Primer and Jet Neuf, were grown in a glasshouse and inoculated at G.S. 2.4–2.7 with pycnidiospores or ascospores of Leptosphaeria maculans. The plants were kept for a further 2–4 weeks at 14°C and then transferred, together with uninoculated plants, to a polythene tunnel in winter. The majority of stems of inoculated plants did not have macroscopic symptoms of L. maculans infection 6 weeks after inoculation. Examination of whole mounts of peripheral tissue and transverse sections of fixed and embedded portions of these stems revealed intercellular septate fungal hyphae, often deep in non-necrotic cortical tissue, in symptomless inoculated plants but not in uninoculated plants. L. maculans was recovered following surface sterilization of adjacent portions of the same stems. When symptomless inoculated plants were transferred to a glasshouse at 18–20°C, cankers soon developed. The significance of these latent mycelial infections to canker development in the field is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1983.tb01297.x
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  • 9
    Electronic Resource
    Electronic Resource
    Carbendazim resistance in the eyespot pathogen Pseudocercosporella herpotrichoides (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 33 (1984), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Mycelial isolates (115) of Pseudocercosporella herpotrichoides were obtained from five field sites in England. Carbendazim-resistant isolates were detected by their mycelial growth on agar containing 1 μg/ml carbendazim. Resistant isolates were found at two of the five sites examined and one of these had never been treated with benzimidazole fungicides. Amongst the carbendazim- resistant isolates there was a predominance of isolates with pale mycelium, an irregular colony margin and a relatively slow growth rate; however, this association was not absolute. Large differences in the effects of carbendazim on mycelial growth of sensitive and resistant isolates were demonstrated; growth of sensitive isolates was completely inhibited at 0.5 μg /ml carbendazim whilst five of the six resistant isolates examined grew on agar containing 1000 μg/ml fungicide. The carbendazim-resistant isolates were cross-resistant to benomyl, thiophanate-methyl and to a Icsser degree thiabendazole, but not to prochloraz. Conidia of carbendazim-resistant isolates were as resistant. Carbendazim-resistant isolates were just as pathogenic to wheat as sensitive isolates. The implications of these results and other reports of benzimidazole resistance in P. herpotrichoides are discussed in relation to disease control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1984.tb00593.x
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  • 10
    Electronic Resource
    Electronic Resource
    Plasma high-density-lipoprotein cholesterol levels during long-term use of an oral contraceptive in Nigerian women (1982)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 89 (1982), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. Total and high-density lipoprotein (HDL) cholesterol were estimated in 131 blood samples obtained from women who had been taking the oral contraceptive Noriday 1+50Fe (one packet contains 21 tablets of 1 mg of norethindrone +0·05 mg of mestranol, and 7 of 75 mg of ferrous fumarate) for 1–60 months. Thirty five women who had never used oral contraception (OC) formed the control group. There was a significantly higher mean HDL cholesterol level, and HDL cholesterol/total cholesterol ratio but not total cholesterol level in the women who had been using OC for 19–60 months. The values in women who had been using OC for 1–18 months were not significantly different from those in the control group. The increase in the HDL cholesterol level may not depend on the oestrogen content of the oral contraceptive but on the duration of its intake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1982.tb05063.x
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