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  • 1
    ISSN: 1432-0428
    Keywords: β-Casomorphin ; enkephalin ; naloxone ; insulin release ; exorphins ; opiates ; dog
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We have previously demonstrated that opiate-like substances in food protein (exorphins), contained in the peptic digest of gluten, stimulate insulin and glucagon release in dogs and that this effect is inhibited by the opiate antagonist naloxone. The present study was designed to evaluate the possible rôle of ingested opiate-like substances in the modulation of post-prandial insulin release. Similarly, the addition of synthetic β-casomorphins, which are the opioid-active material of bovine casein peptone, elicit a stimulation of post-prandial insulin release during a liver extract-sucrose test meal. The addition of met-enkephalin to a liver extract-sucrose test meal also augmented the post-prandial insulin response. Both stimulatory effects were reversed by oral naloxone, as was the post-prandial increase of insulin following ingestion of bovine casein peptone (casopeptone). The post-prandial insulin response to digested and undigested liver extract was not affected by naloxone, suggesting that the foregoing effects are likely to be specific to opiate-like materials contained in foodstuff (exorphins). In view of previous findings, the present data are compatible with a role of opiate-like substances contained in ingested nutrients in the regulation of post-prandial insulin secretion.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The importance of predators in controlling the densities of infaunal (〉0.5 mm) organisms was investigated in the mesohaline region of the Upper Chesapeake Bay (USA) using field experiments. The role of predators in controlling infaunal density and community characteristics varied with habitat type, season (i.e., predator abundance) and developmental or successional stage of the community. Few infaunal species were adversely affected by predator exclusion. Species that increased greatly in abundance in the absence of predators (e.g. Eteone heteropoda, Streblospio benedicti, Nereis succinea, and juvenile Macoma balthica and Mya arenaria) lived near the sediment-water interface and had major population pulses from fall through spring. Species whose abundances increased moderately or were not affected by predator exclusion were deeper burrowing organisms (e.g. Heteromastus filiformis and adult Mya arenaria), or were relatively small organisms (e.g. Paraprionospio pinnata, Scolecolepides viridis and Peloscolex gabriellae) whose principal predators could be other members of the infauna. Competition did not appear to be an important factor controlling infaunal density in these experiments.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 37 (1976), S. 341-348 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Quantitative (0.25 m2) samples of macrofaunal (〉1.0 mm) invertebrates were taken in each season from one habitat of an intertidal sandbar in the North Inlet estuary near Georgetown, South Carolina, USA. During all seasons the community inhabiting the sample site was numerically dominated by two species of haustoriid amphipods (Acanthohaustorius millsi and Pseudohaustorius caroliniensis). Seasonal changes at the community level were clearly controlled by the population dynamics of the numerically dominant species, and qualitative information on life histories was important to the interpretation of analyses' results.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 27 (1974), S. 191-196 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Six species of benthic diatoms and a natural benthic diatom community were cultured in flasks on a variety of sediments. Diatom species which secreted large quantities of mucilage were effective sediment stabilizers. These mucilage-secreting species significantly reduced resuspension and retarded laminar flow of the sediments when the culture flasks were agitated. Diatom species which secreted little or no mucilage were not effective sediment stabilizers. These non-mucilage-secreting species did not significantly effect resuspension or laminar flow of the sediments when the culture flasks were agitated. A sediment stabilizing mechanism based on the secretion of mucilage by pennate benthic diatoms is proposed. The effect such a process may have on distributional patterns of benthic invertebrates in areas where extensive diatom or other microalgal films occur is discussed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The COL6A1 and COL6A2 (collagen VI) gene cluster on chromosome 21 is a candidate region for defects leading to congenital heart anomalies in Down's syndrome. We report a variable number of tandem repeats (VNTR) and a restriction fragment length polymorphism (RFLP) in this gene region, detected using a COL6A1 cDNA probe. Linkage disequilibrium relationships were studied among the RFLPs of this gene cluster. The RFLP reported here shows no significant linkage disequilibrium with any others in the region. It has a polymorphism information content value of 0.27, raising the informativity of the locus.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 108 (1976), S. 231-242 
    ISSN: 1432-072X
    Keywords: Phytophthora ; Penetration ; Eucalypts ; Roots ; Electron microscopy ; Appressoria ; Plugs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The mechanisms of penetration of Phytophthora cinnamomi Rands into seedling eucalypt roots were studied by light and electron microscopy. Culture grown seedlings of root-rot tolerant Eucalyptus st johnii and root-rot susceptible Eucalyptus obliqua were inoculated with both zoospores and mycelium. Zoospores encysted on roots of both species and the germ tubes penetrated without the formation of appressoria. Swellings, previously described as appressoria, were formed when the germ tube was slow to enter the host by intracellular penetration. Vegetative hyphae penetrated both inter- and intracellularly into the zones of root elongation and differentiation, often through root hairs. Evidence of hydrolysis of the host cell-wall at the point of penetration was observed in electron micrographs. Several hours after the germ tube penetrated the epidermis, a thick plug of amorphous material formed in the germ tube slightly below the level of the outer walls of the epidermal cells, sealing off the hypha within the root. Behaviour of zoospores and germ tubes and the mechanism of penetration were similar on both hosts. Micrographs do not suggest any kind of a hypersensitive reaction by the host cells during the early stages of infection.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 75 (1971), S. 281-284 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. Various fixation and embedding procedures were tested on the retention of immunofluorescent staining. Intact hyphae of Ophiobolus graminis Sacc. were fixed in various aldehyde solution both before and after indirect immunofluorescent staining. Paraformaldehyde and glutaraldehyde solutions did not affect the intensity of fluorescence while acrolein quenched fluorescence slightly. 2. Immunofluorescent stained hyphae fixed in 3% glutaraldehyde, dehydrated, embedded in glycol methacrylate and sectioned at 1–2 μm retained fluorescence allowing more precise location of the antigen.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-072X
    Keywords: Syntrophic association ; Interspecies H2 transfer ; Butyrate oxidation ; Acetogenesis ; Methanogenesis ; Gaseous olefin ; Catalytic hydrogenation ; Pd catalysts ; Syntrophomonas wolfei ; Methanospirillum hungatei
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Methanogenesis by a Syntrophomonas wolfei/ Methanospirillum hungatei coculture was inhibited in presence of ethylene and the hydrogenation catalyst Pd-BaSO4. However, butyrate oxidation by S. wolfei continued and ethylene was reduced to ethane. Per mol of butyrate oxidized, 2.4 mol acetate was produced and 0.8 mol ethylene was reduced. Acetylene, propylene and butene were less effective as H2 acceptors than ethylene, and addition of bromoethanesulfonic acid was necessary to inhibit methanogenesis in the presence of the two longer-chain olefins. Other hydrogenation catalysts were less effective in the order Pd-charcoal 〈 PE-asbestos 〈 Pd-PEI beads 〈 Pt-Al2O3, Pd-CaCO3. Optimal ethylene hydrogenation was achieved with still incubation in presence of 7.2 mg Pd-BaSO4 and 0.7 g sand per ml medium. The higher catabolic rate of S. wolfei in presence of the methanogen indicated that the biological H2 removal mechanism was more efficient than the catalytic olefin reduction.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-1041
    Keywords: acarbose ; diabetes mellitus ; carbohydrate tolerance ; fibre-free formula diet ; disaccharidase inhibition ; side-effects ; plasma insulin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The influence of the disaccharidase inhibitor acarbose on carbohydrate tolerance was investigated in healthy subjects during substitution of fibre-free formula diets for normal food. Two separate experiments showed that acarbose was highly efficient in retarding and diminishing the postprandial rise in blood glucose and serum insulin when administered with these diets for 10 to 14 days. Acarbose decreased the area under the postprandial curves of blood glucose from 1.836 to −504 mg/dl×min in Study 1, and from 587 to −302 mg/dl×min in Study 2. The area under the serum insulin curves was reduced from 5.022 to 1.440 µU/ml×min in Study 1, and from 7.990 to 918 µU/ml×min in Study 2. In addition, acarbose greatly diminished the interindividual variation in postprandial serum insulin concentration. Its efficacy in reducing the glycaemic response to a test meal in both experiments was found to depend on the time of initiation of therapy; in contrast, the serum insulin response was only time-dependent in Study 2. Use of fibre-free diets to standardise experimental conditions proved to be a valuable tool in investigating these details.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1557-1566 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A diagnostic has been developed for measurements of the evolution of plasma density distributions in two dimensions using the principles of computed emisson tomography. The system measures the near-infrared emission along several chords through the plasma cross section and the emission profile is then reconstructed using a maximum entropy based algorithm. This paper will present details of the reconstruction algorithm, the data collection system, the verification of the diagnostic using both physical and numerical phantom sources, evidence for the correlation between n2 and the infrared emission intensity, and initial measurements on a tokamak plasma.
    Type of Medium: Electronic Resource
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