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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Clinical oral investigations 4 (2000), S. 176-182 
    ISSN: 1436-3771
    Keywords: Key words Children ; Primary and secondary Sjögren’s syndrome ; Classification ; Oral and ocular manifestations ; Parotitis ; Salivary gland enlargement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Sjögren’s syndrome is a chronic inflammatory systemic autoimmune disease mainly affecting the exocrine and, particularly, the salivary and lacrimal glands. The condition usually occurs in adults. In 1994, the criteria for this syndrome were redefined in a multicenter European study. In children, Sjögren’s syndrome is a rare and probably underdiagnosed disease. To date, Sjögren’s syndrome in children has only been described in case reports and in the comparative presentation of various study results. So far, no study of a comparative classification into primary and secondary Sjögren’s syndrome has been carried out in a patient population of any size. Sjögren’s syndrome should be considered in the differential diagnosis of children with recurrent parotitis, keratoconjunctivitis sicca, or pronounced and early tooth decay associated with xerostomia. In this study of 23 children and adolescents under the age of 16 with the clinical symptoms and laboratory findings of Sjögren’s syndrome, we differentiate between primary and secondary Sjögren’s syndrome. The value of the individual methods of assessing the oral and the ophthalmological components and the manifestation of the underlying rheumatic condition are discussed on the basis of the EULAR criteria. The EULAR diagnostic criteria are of limited applicability in children because reliable anamnestic data are frequently lacking. Another problem in diagnosing Sjögren’s syndrome is the short-term detection of serological alterations and clinical symptoms. Even if young patients do not completely fulfill the required criteria, Sjögren’s syndrome can be assumed or confirmed in the presence of positive testing for oral and ocular manifestations and recurrent salivary gland enlargement.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 103 (1983), S. 75-79 
    ISSN: 1573-5117
    Keywords: paleolimnology ; Dead Sea climate ; pore-waters ; diffusion ; sediments ; salinity ; porosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The salinity of lakes is subject to variations imposed by climatic changes. These variations are recorded in the salinity profile of pore waters. Meromictic lakes, such as the Dead Sea, are a special case where waters which underlie the mixolimnion reflect salinity variations. In a sediment core from Dead Sea shallow waters, the salinity profile exhibited a minimum at about 1.9 m depth. It is shown by a diffusion model that this minimum can be attributed to lower salinities which prevailed at the sediment water interface for several decades around the turn of this century. No such minimum was observed in a sediment core from the deepest part of the lake where, during the last two centuries, the overlying brines had a constant salinity.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 197 (1990), S. 23-33 
    ISSN: 1573-5117
    Keywords: heavy metals ; halite ; coprecipitation ; Dead Sea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract After a prolongued period of stratification (about 300 years) the Dead Sea overturned in 1979 and again in 1982. Its waters became saturated with respect to halite and the massive precipitation of halite which occurred in winter 1982/83 has been monitored. We followed the fate of the heavy metals during this period of physical and chemical changes. The concentrations of Zn, Cd, Pb and Cu in the Dead Sea waters have been measured by anodic stripping voltammetry (ASV) which provided sensitive measurement of these elements after a minimal pretreatment of the samples (dilution 1: 1 and acidification). In the meromictic lake (prior to 1979), the concentrations of all four elements were larger in the deep anoxic layers. With the onset of halite precipitation a decline in their concentrations was observed. Most dramatic was the decrease in Cd, which practically disappeared from the water column in 1985. The coprecipitation of heavy metals with halite — collected by sediment traps in 1983 — was examined, as well as that of older halite recovered from a sediment core. Although concentrations of heavy metals were somewhat larger in recent halite, all halite samples had the same coprecipitation pattern: the concentration of Pb was the largest, followed by Cd, and that of Cu was the smallest. The apparent distribution coefficient was larger for Cd than for Pb. We estimated the amount of Cd which may have accompanied the deposition of halite during 1983–1985; it is compatible with its observed disappearance from the water column in 1985. The amounts of Pb and of Zn which are missing from the Dead Sea of 1985 are much larger than can be accounted for by coprecipitation with halite. A possible explanation is that the formation of halite crystals may have enhanced settling of particulates which in turn, may have scavenged Pb and Zn from the Dead Sea waters. Cu seems to be much less affected by the physical and chemical events which occurred in the Dead Sea during 1976–1985.
    Type of Medium: Electronic Resource
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