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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of child psychology and psychiatry 30 (1989), S. 0 
    ISSN: 1469-7610
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: Abstract The Nordic countries were screened for the occurrence of cases of autism with a same-sexed twin under age 25 years. Twenty-one pairs (11 monozygotic and 10 dizygotic) of twins and one set of identical triplets were found and extensively examined. The concordance for autism by pair was 91% in the monozygotic and 0% in the dizygotic pairs. The corresponding concordances for cognitive disorder were 91% and 30% respectively. In most of the pairs discordant for autism, the autistic twin had more perinatal stress. The results lend support for the notion that autism sometimes has a hereditary component and that perinatal stress is involved in some cases.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology reviews 14 (1994), S. 0 
    ISSN: 1574-6976
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract: The production of the fusion protein staphylococcal protein A/E. coliβ-galactosidase in Escherichiacoli was studied in batch and fed batch cultivations. Batch cultivation of a recombinant E. coli strain yielded a final cell dry weight of 16.4 g 1-1 with a final intracellular product concentration of recombinant protein corresponding to approximately 38% of the cell dry weight. Fed batch cultivation made it possible to increase the final cell dry weight to 77.0 g 1-1. The intracellular product concentration (25%) was lower as compared to batch cultivation resulting in a total concentration of recombinant protein of 19.2 g 1-1.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology reviews 14 (1994), S. 0 
    ISSN: 1574-6976
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract: Escherichia coli was grown in carbon- and energy source-limited fed batch cultures to study the effect of osmotic stress and different feed rates on the growth kinetics. An unstructured model based on the linear equation for substrate consumption provided an adequate description of the bacterial growth during the first phase of biomass production (20 h), except for cultures exposed to osmotic stress by the addition of 0.5 M NaCl. The addition of salt to the culture media had a large effect on the energetics, that could not simply be described in terms of an increased maintenance requirement. In the later phase of growth, an extensive decline in viability for all cultures was observed. Coincidentally, the specific sugar uptake rate approached a lower limit. It is concluded that the total obtainable biomass in a fed batch culture is strongly affected by the magnitudes of the substrate feed rate and the ionic strength of the culture medium.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neural transmission 69 (1987), S. 105-114 
    ISSN: 1435-1463
    Keywords: GH ; serotonin ; noradrenaline ; clonidine ; PCPA ; FLA-63 ; reserpine ; rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Administration of the alpha2-adrenoceptor agonist clonidine induces growth hormone (GH) release in rat and man. In the present study it is shown that the GH response to clonidine is weaker in rats exposed to depletion of both noradrenaline and serotonin (by means of reserpine or the combined treatment of FLA-63 and PCPA) than in animals exposed to noradrenaline depletion (by means of FLA-63) only. The possibility that an impaired serotonergic neurotransmission contributes to the blunted GH responses to clonidine observed in patients suffering from endogenous depression is discussed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé La désartérialisation hépatique ou la ligature permanente de l'artère hépatique peut provoquer des phénomènes de nécrose mais leur durée est limitée en raison du développement rapide d'une circulation artérielle collatérale. Le but de cette étude est de déterminer si la formation du réseau collatéral peut être réduite ou empêchée par désartérialisations intermittentes répétées. Trois groupes de cochons ont été respectivement soumis quotidiennement à cette méthode pendant 2 heures (n=5), 4 heures (n=5), et 6 heures (n=4) pendant une période de plus de 4 semaines à l'aide de l'appareil occlusif implantable décrit antérieurement par les auteurs. Ces animaux ont été comparés à un groupe de cochons (n=4) soumis à une désartérialisation hépatique permanente. Enfin un dernier groupe (n=3) d'animaux qui n'ont pas subi de désartérialisation a constitué un groupe de contrôle. Après 4 semaines des angiogrammes hépatiques ont été pratiqués et le flux sanguin artérial hépatique global a été mesuré à l'aide de microsphères radio marquées. Les constatations furent les suivantes: absence de collatérales dans le premier groupe, formation de quelques collatérales dans le second, réseau complet de collatérales dans le troisième identique à celui observé chez les animaux soumis à une désartérialisation permanente. Le flux artériel hépatique fut significativement plus bas dans le second groupe (4 heures) par rapport au groupe soumis à une désartérialisation permanente (p〈0.01, test de Wilcoxon) et encore plus bas dans le premier groupe (p〈0.0001, test de Wilcoxon). En conséquence il semble que la désartérialisation brève et répétée empêche la formation de collatérales artérielles en provoquant une ischémie artérielle répétée susceptible d'exercer une action utile dans le traitement des tumeurs du foie. En outre la préservation de la perméabilité artérielle permet l'injection continue intra-artérielle d'agents cytostatiques.
    Abstract: Resumen La desarterialización hepática y ligadura permanente de la arteria hepática puede inducir necrosis tumoral, pero sólo de duración limitada, en parte debido al rápido desarrollo de colaterales arteriales. El propósito de este estudio fue determinar si la formación de colaterales puede ser reducida o evitada mediante desarterializaciones repetidas y transitorias. Tres grupos de cerdos fueron sometidos a desarterialización repetida y transitoria por periodos de 2 horas (n=5), 4 horas (n =5), y 6 horas (n=4), respectivamente, en un periodo de 4 semanas, por medio de un método de oclusión vascular previamente descrito por nosotros. Estos cerdos fueron comparados con un grupo que había sido sometido a desarterialización hepática permanente (n=4). Un grupo adicional (n=3), no sometido a desarterialización, sirvió como control. Después de 4 semanas de tratamiento se tomaron angiogramas hepáticos y el flujo arterial hepático absoluto fue medido por medio del método de microesferas radiomarcadas. No se encontraron colaterales demostrables en el grupo de 2 horas, se observó la formación de algunas colaterales pequeñas en el grupo de 4 horas, y se observó el desarrollo de una bien formada red de colaterales en el grupo de 6 horas, con hallazgos similares en el grupo de desarterialización permanente. El flujo arterial hepático absoluto apareció significativamente menor en el grupo de 4 horas con la arteria hepática obstruída en comparación con los animales con desarterialización hepática permanente (p〈0.01, prueba de adición del rango de Wilcoxon) y significativamente menor en el grupo de 2 horas (p〈 0.0001). Por consiguiente, la desarterialización breve y repetida parece evitar la formación de colaterales arteriales y hace posible realizar la isquemia arterial repetida del hígado, lo cual puede ser útil en el tratamiento de los tumores del hígado. Además la presencia de una arteria hepática permeable permite la infusión intraarterial continua de agentes citostásicos.
    Notes: Abstract Hepatic dearterialization and permanent hepatic artery ligation can induce tumor necrosis but only of limited duration, partly due to a rapid development of arterial collaterals. The aim of this study was to determine if collateral formation could be reduced or prevented by repeated, transient dearterialization. Three groups of pigs were repeatedly and transiently dearterialized daily for 2 hours (n=5), 4 hours (n=5), and 6 hours (n=4), respectively, over a 4-week-period by means of a totally implantable vascular occluder described earlier by us. These pigs were compared with a group having permanent hepatic dearterialization (n=4). An additional group (n=3) served as a control and did not have dearterialization. After 4 weeks of treatment, hepatic angiograms were taken and absolute hepatic arterial blood flow was measured according to the reference sample method with radiolabeled microspheres. There were no demonstrable collaterals in the 2-hour group, formation of some small collaterals in the 4-hour group, and a fully developed collateral network in the 6-hour group, with similar findings in the permanently dearterialized group. Absolute hepatic arterial blood flow was significantly lower in the 4-hour group with obstructed hepatic artery compared to permanent hepatic dearterialization (p〈0.01, Wilcoxon rank sum test) and highly significantly lower in the 2-hour group (p〈0.0001, Wilcoxon rank sum test). Thus, repeated and brief dearterialization seems to prevent the formation of arterial collaterals and makes repeated arterial ischemia of the liver possible which could be of value in the treatment of liver tumors. In addition, a patent artery makes continuous intra-arterial cytostatic infusion possible.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nuclear medicine 14 (1988), S. 393-399 
    ISSN: 1619-7089
    Keywords: 195Au ; Biokinetics ; Dosimetry ; Animal study
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The use of the generator produced radionuclide 195mAu, half life 30 s, has become feasible for several different investigations, e.g. cardiac studies. To assess the absorbed dose from the long lived radionuclide 195Au (the daughter of 195mAu, half life 183 days), a biodistribution study of 195Au was performed in animals. Seven rabbits were injected with eluate from a 195mHg-195mAu generator and the retention and the biodistribution of the long lived gold isotope was investigated. The activity was localized mainly in the liver and the kidneys. Transforming the data to man resulted in an absorbed dose from 195Au from 1 elution (approximately 925 MBq 195mAu) of 2.2 mGy to the kidney and 1.3 mGy to the liver and an effective dose equivalent of 0.26 mSv. The total effective dose equivalent from all radionuclides in the eluate (195mAu, 195Au, 195mHg and 195Hg), was estimated to be 0.65 mSv for a single injection (925 MBq 195mAu).
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nuclear medicine 15 (1989), S. 806-806 
    ISSN: 1619-7089
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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