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  • 1
    ISSN: 1432-1084
    Keywords: Key words: Appendicitis ; Diverticulitis ; US ; CT ; Pitfalls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. We describe four patients in whom ultrasound (US) and/or computed tomography (CT) demonstrated a thickened appendix, secondarily enlarged due to perforated sigmoid diverticulitis (n = 2) or carcinoma (n = 2). The underlying pathology was correctly recognized in all cases. Secondary thickening of the appendix due to perforated sigmoid disease provides a potential pitfall mainly on US and may lead to an incorrect diagnosis and thus to unnecessary surgery or a wrong surgical intervention. Although US alone is enough to diagnose periappendicitis and sigmoid disease, combined use of US and CT may improve assessment of its origin and extension.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Free Radicals in Biology & Medicine 2 (1986), S. 369-372 
    ISSN: 0748-5514
    Keywords: Bronchopulmonary dysplasia ; Chest X ray ; Newborn ; Oxidants ; Superoxide dismutase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Free Radicals in Biology & Medicine 2 (1986), S. 295-298 
    ISSN: 0748-5514
    Keywords: Bronchopulmonary dysplasia ; Neonates ; Oxidant injury ; Superoxide dismutase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Humans and climate affect ecosystems and their services, which may involve continuous and discontinuous transitions from one stable state to another. Discontinuous transitions are abrupt, irreversible and among the most catastrophic changes of ecosystems identified. For terrestrial ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 89 (1960), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1433-0350
    Keywords: Atretic cephalocele ; Cephalocele ; Cranium bifidum ; Encephalocele ; Hydrocephalus ; Neural tube defects ; Syndromes with cephalocele
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report a series of 46 children who were treated for one of the diverse forms of cranium bifidum during a period of 22 years. The purpose of the survey was to investigate pathogenetic factors involved in the development of cranial dysraphism and to analyze clinical and pathological factors that influence the patients' outcome. We also investigated the existence of associated intracranial anomalies, in a systematic way, using modern methods of neuroimaging, and related the findings to the patients' final results. The lesions were classified as encephalocele (n = 15), cranial meningocele (n = 3), atretic cephalocele (n = 26), cranium bifidum occultum (n = 1), and exencephaly (n = 1). There was an excess of the atretic form of cephaloceles in our series, a fact that probably reflects geographical variations described for cephaloceles in general. The location of the lesions was occipital in 29 children, parietal in 16, and temporal and frontobasal in one case each. In seven cases there was parental consanguinity. A familial history of malformations of the central nervous system was encountered in eight instances. Associated systemic abnormalities were present in 23 patients, while central nervous system anomalies were found in 36 children. Cephalocele repair was undertaken on 35 occasions. There were no surgical fatalities in the series. The mean follow-up time was of 7 years. Overall mortality for the whole group was of 17/46 or 36%. Twenty of the 29 survivors had no neurological sequelae, but only 13 children exhibited a competitive intelligence level. A good outcome was found to correlate well with: an average head size at birth, a normal initial neurological condition, operability of the lesions, and an absence of disorders of the neuronal migration. Neurological outcome depended also on the occurrence or not of hydrocephalus, while the intelligence level was mainly related to the absence of cerebral tissue within the sac of the malformation.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 206 (1965), S. 326-326 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Lucerne seedlings inoculated with an effective strain of R. meliloti were grown aseptically in Hoagland's nitrogen-free nutrient solution5 supplemented with various concentrations of KNOa and 0.8 per cent agar. Each treatment group consistad of 1215 plants. The data of Table 1 not only confirm the ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 15 (1961), S. 268-280 
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The size of both the denitrifying and the total bacterial population was found to be positively correlated with soil pH, but the denitrifying bacteria were more sensitive to acid environments than the bacterial microflora as a whole. The ecological evidence for a pH effect was supported by studies with individual pure cultures. The estimate of abundance of denitrifying micro-organisms was also affected markedly by the composition of the medium, and an improved medium has been proposed. Marked differences were noted in the nutrition of the bacteria capable of N2 production. In the absence of oxygen, certain strains developed readily using nitrate as the terminal electron acceptor for growth in media with no preformed growth factors, but others required ammonium or growth factors for denitrification to occur.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-8477
    Keywords: developmental instability ; gynodioecy ; Teucrium lusitanicum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Developmental instability was assessed in two geographical races of Teucrium lusitanicum using morphometric measures of vegetative and reproductive structures. T. lusitanicum is a gynodioecious species. Male sterile (female) individuals showed greater developmental instability at all sites. Plants located inland had higher developmental instability of vegetative characters and lower developmental instability of reproductive characters than coastal plants. These results support the contentions that (1) developmental instability is affected more by the disruption of co-adapted gene complexes than by lower heterozygosity, and (2) different habitat characteristics result in the differential response of vegetative and reproductive structures.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-5052
    Keywords: Cistus ladanifer ; Developmental instability ; Fluctuating asymmetry ; Serpentine ; Translational asymmetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Developmental instability is the result of random environmental perturbations during development. Its absence (developmental stability) depends on an organism's ability to buffer environmental disturbances. Both genotype and environment influence the phenotypic expression of developmental instability and it is susceptible to selection pressure. We studied developmental instability (as indicated by increased within-individual asymmetry of repeated traits) in vegetative and reproductive structures of three populations of Cistus ladanifer L. living in different soil substrates (serpentine, siliceous and contact zone) to detect tolerance to serpentine soils. Serpentine soils, characterized by high concentrations of heavy metals (Ni, Cr, and Co), low levels of Ca/Mg ratio and high water deficit, can adversely affect plant performance. In this study we demonstrated that asymmetry and within-plant variance were higher in the contact zone population than either the silica or serpentine populations, proving the adaptation of C. ladanifer to serpentine soils. Within-population estimates of developmental instability were concordant for both vegetative and reproductive traits. There was little or no within-individual correlation among estimates of developmental instability based on different structures, i.e., plants that had highly asymmetric leaves always had high developmental instability in translational symmetry. Radial asymmetry of petals was negatively correlated with petal size, especially in silica soil plants, providing evidence of selection for symmetric and large petals. While leaf size was positively correlated with absolute fluctuating asymmetry, suggesting selection for small or intermediate size leaves. Serpentine soils presented the largest foliar and floral traits, as well as shoot elongation, while silica soil plants had the smallest scores. On the contrary, aboveground plant biomass was larger in silica soil plants, while the contact zone plants had the lowest biomass.
    Type of Medium: Electronic Resource
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