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  • 11
    ISSN: 1432-0460
    Keywords: Gastroesophageal reflux ; Gastroesophageal reflux model ; Deglutition ; Deglutition disorders
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this paper, the isolated influence of physical factors on the development of gastroesophageal reflux in man is analyzed by means of a mechanical model. We evaluate the influence of gravity, intraabdominal presure, intrathoraci pressure, transmission of intraabdominal pressure to the high pressure zone, filling volume of the stomach, and the existence of a high pressure zone on the appearance of gastroensophageal reflux. PH-metry is used to record the episodes of reflux in the model. We wish to demonstrate the importance of gravity and intraabdominal pressure in the production of reflux. Intrathoracic pressure acts as an antireflux mechanism only when associated with a zone of high pressure. The intraabdominal pressure may be transmitted to the high pressure zone as a purely mechanical effect and the greater gastric filling volume may, when associated with the intraabdominal pressure, facilitate reflux without physical changes in the high pressure zone (the equivalent of a reduction in the length of the lower esophageal sphincter in man). We conclude that this model may help to explain the influence of the physical factors mentioned above on the development of gastroesophageal reflux in man.
    Type of Medium: Electronic Resource
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  • 12
    ISSN: 1432-0509
    Keywords: Key words: Magnetic resonance imaging—Liver, neoplasms—Budd-Chiari syndrome—Computed tomography.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Budd-Chiari syndrome is a rare disease characterized by hepatic outflow obstruction due to different causes. Hepatic nodules in patients with Budd-Chiari syndrome are rare and can be due to hepatocellular carcinoma and benign regenerative nodules. Imaging descriptions of regenerative nodules in cirrhotic livers are numerous, but the imaging findings of benign regenerative nodules associated with Budd-Chiari syndrome have only recently been reported. We present the computed tomographic and magnetic resonance features of benign regenerative hepatic nodules with copper accumulation in a patient with chronic Budd-Chiari syndrome.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 12 (1933), S. 662-663 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 14
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The gonads of Serranus cabrilla (Linnaeus, 1758) from the Canary Islands were studied between September 1992 and July 1993. Macroscopic classification of the maturity stages was compared with histolog ical classification of gonad characteristics, and the effect␣of the classification method on the determination of the spawning season and size at maturity was investigated. Analysis of gonad organization and development confirmed that this species is synchronously hermaphroditic. Ovarian-tissue development is asynchronous, and testicular tissue consists of continuous spermatogonia. Six stages of oogenesis and five of spermatogenesis are described, based on differences in staining and in size and on differences in the nucleus and cytoplasm structure as viewed through a light microscope. Two types of atretic degeneration of eggs are also described. Agreement between macroscopic and histological staging was low, although both methods provided similar results in spawning-season determination and size at maturity. The spawning season of S. cabrilla is from February to July, with a peak in May. Fish size at first maturity (size at which 50% of all fish sampled are in relevant maturity stage) is 152 mm standard length (SL), and size at mass maturity (size at which 95% of all fish sampled are in relevant maturity stage) is 167 mm SL.
    Type of Medium: Electronic Resource
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  • 15
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An entire bed of the blue mussel Mytilus edulis, consisting of 5,000 individuals/m2, died during June, 1971 in the effluent canal of a steam generating plant when the temperature increased above 27°C. Similarly, the population in the intake canal disappeared when temperatures rose above 27°C in August. Laboratory studies showed that M. edulis could not tolerate continuous temperatures above 27°C, and feeding stopped shortly after the mussels were exposed to 25°C. Histopathological studies indicated that the cause of death of this bivalve was associated with degeneration of the frontal and laterofrontal cilia of the columnar epithelium of the gill filaments. In conjuction with this, there was necrosis and sloughing of the epithelium of the intestinal diverticula. Extensive amoebocytic infiltration was noted in the byssogenous cavity, gill filaments and stomach wall.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 41 (1977), S. 141-145 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Critical thermal maxima (CTM) were determined for winter flounder (Pseudopleuronectes americanus, Walbaum) and scup (Stenotomus chrysops, L.), acclimated to ambient water temperature or constant increments above ambient. The acclimation regimes simulated a natural environment by tracking the temperature fluctuations in Point Judith Pond, a small Rhode Island estuary. An elevation in CTM from 30.2° to 35.6°C was observed for scup as the mean acclimation temperature increased from 14.8° to 22.2°C. CTM for flounder increased from 26.4° to 32.4°C over an acclimation range of 4.2° to 23.0°C. The use of CTM studies for predicting the effects of heated effluents is discussed.
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 27 (1974), S. 219-223 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Determination of the critical thermal maxima and upper lethal temperatures for Acartia tonsa Dana and A. clausi Giesbrecht revealed the relative temperature tolerance of the two species. A. tonsa exhibited a wider range of acclimation temperatures compared to A. clausi. The response of A. tonsa is related to its ubiquity in Atlantic Ocean estuaries (temperate and tropical), and its capacity to live in temperate waters throughout most of the year. Differences between upper lethal temperatures and critical thermal maxima were very narrow for A. tonsa from tropical and subtropical areas. This suggests that, in warm climates, this copepod lives close to its upper lethal temperature limits.
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Manuscripta mathematica 98 (1999), S. 37-54 
    ISSN: 1432-1785
    Keywords: Mathematics Subject Classification (1991):14H40, 11G10, 11F11
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract: Ribet [Ri] has generalized the conjecture of Shimura–Taniyama–Weil to abelian varieties defined over Q,giving rise to the study of abelian varieties of GL2-type. In this context, all curves over Q of genus one have Jacobian variety of GL2-type. Our aim in this paper is to begin with the analysis of which curves of genus 2 have Jacobian variety of GL2-type. To this end, we restrict our attention to curves with rational Rosenhain model and non-abelian automorphism group, and use the embedding of this group into the endomorphism algebra of its Jacobian variety to determine if it is of GL2-type.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 126 (1996), S. 785-789 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Size-selective grazing on bacterioplankton by phagotrophic nanoflagellates was analyzed and modelled. The proposed model resembles a Monod equation (Michaelis-Menten-like expression) in which clearance rates by heterotrophic nanoflagellates depend on bacterioplnnkton biovolume. Larger bacteria were ingested faster than smaller bacteria. The proposed model was in agreement with experimental data from different authors, both from cultures and natural assemblages. Size-selective grazing efficiency was analyzed as the ability of phagotrophic nanoflagellates to discriminate between cells differing in volume by a factor of two, e.g., corresponding to dividing and nondividing bacteria. Unlike previously published models, the proposed model suggests that phagotrophic nanoflagellates could be highly effective size-selective grazers for small bacteria (〈0.1 μm3), which are the most common bacterial sizes in planktonic systems. However, phagotrophic nanoflagellates were unable to size-discriminate dividing and nondividing bacteria for volumes 〉0.1 μm3. These results strongly support the hypothesis that heterotrophic nanoflagellate grazing, by discriminating between different sizes of dividing and nondividing bacteria, may actually be regulating bacterial size and growth rate in natural aquatic ecosystems.
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 243 (1996), S. 350-353 
    ISSN: 1432-1459
    Keywords: Morvan's fibrillary chorea ; Neuromyotonia ; Isaacs' syndrome ; Plasmapheresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We evaluated the effects of plasmapheresis in two patients with Morvan's fibrillary chorea, one of whom had sigmoid carcinoma, with oligoclonal bands in the cerebrospinal fluid, and modifications of the lipid-oxidative muscle pattern. The use of plasmapheresis in the treatment of Morvan's fibrillary chorea has not been reported previously and in our patients improved the symptoms markedly.
    Type of Medium: Electronic Resource
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