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  • 1
    Electronic Resource
    Electronic Resource
    Membrane effects mediated by alpha-and beta-adrenoceptors in mouse parotid acinar cells (1974)
    Springer
    The journal of membrane biology 16 (1974), S. 353-362 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Epinephrine caused a dose dependent increase in the electrical potential difference across the mouse parotid acinar cell membrane (hyperpolarization). Norepinephrine, synephrine and acetylcholine also caused membrane hyperpolarization. This hyperpolarization was not abolished by ouabain (1mm) and was enhanced in the absence of extracellular potassium. In constrast, the β-adrenoceptor agonist isoproterenol and its isomer metaproterenol caused membrane depolarization, this effect was blocked by propranolol (5 μm). In the presence of the α-adrenoceptor blocking agent phentolamine (10 μm), epinephrine stimulation also resulted in membrane depolarization while acetylcholine still hyperpolarized the cell membrane. The membrane effect of epinephrine (hyperpolarization) or isoproterenol (depolarization) was at least partly retained during superfusion of the parotid gland segments with Ca2+-free solution containing EGTA (10−4 m) at a time when the resting membrane potential was reduced to 50% of its control value as a result of the extracellular Ca2+ deprivation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01872423
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of oral labetalol on plasma catecholamines, renin and aldosterone in patients with severe arterial hypertension (1979)
    Springer
    European journal of clinical pharmacology 16 (1979), S. 305-310 
    Details
    ISSN: 1432-1041
    Keywords: labetalol ; furosemide ; hypertension ; aldosterone ; blood pressure ; plasma catecholamines ; renin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Arterial blood pressure and plasma catecholamines, renin activity and aldosterone concentration in 12 patients with severe essential hypertension were studied before and after combined α-and β-adrenergic receptor blockade induced by oral labetalol treatment for 2 months. Furosemide in a fixed dose was employed as a basic antihypertensive agent throughout the study. Blood pressure was adequately controlled in only 6 patients. Mean body weight increased by 1.8 kg and there was a rise in body weight which was inversely correlated with the fall in standing mean blood pressure. The mean plasma noradrenaline concentration decreased from 0.30 to 0.20 ng/ml, whereas plasma adrenaline did not change significantly. Plasma renin activity and aldosterone concentration varied greatly, but the mean values did not change significantly. Change in body weight was correlated inversely with changes in plasma noradrenaline and renin. The results suggest that labetalol, through its combined α- and β-adrenergic receptor blocking action, induces a rise in body weight, probably due to sodium and fluid retention, which partly counterbalances the antihypertensive effect of labetalol, and partly modifies both renin and sympathetic nervous activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00605626
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  • 3
    Electronic Resource
    Electronic Resource
    Ion-induced modification of graphite coatings (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1177-1179 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Burnished graphite powders and physical vapor-deposition (PVD) coatings of layered crystalline materials such as MoSx have often been used as solid lubricants. This letter will report on a novel ion-induced modification of a graphite-powder coating on a silicon surface. Even at very low ion doses, the bombardment results in structural modifications observed as a considerable reduction in x rays reflected from the (002) sliding planes, which indicates an amorphization process. Transmission electron microscopy (TEM) studies have confirmed almost complete amorphization with 200 keV Ar ions at 1016 ions cm−2. A commercial scanning tunneling microscope (STM) was used as an advanced profilometer to study ion-induced changes in the surface morphology at the powder surface. The mechanical properties of the combined graphite-coating/silicon system were studied by nanoindentation technique, and the perspectives in ion-beam burnishing of graphite coatings will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107638
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  • 4
    Electronic Resource
    Electronic Resource
    High-resolution sequence stratigraphy of a Hettangian-Sinemurian paralic succession, Bornholm, Denmark (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 42 (1995), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Sequence stratigraphic interpretation of paralic successions is complicated by the complex interfingering of marine and continental strata. The successions may also include terrestrial extensions of marine parasequences and completely independent lacustrine parasequence analogues. Failure in recognizing the possible interbeddding of these two independent parasequence types may lead to construction of sequence stratigraphic schemes based on incompatible data sets. We have studied a Lower Jurassic paralic section from the Baltic island of Bornholm, situated in the Tornquist Zone, which demarcates the transition from the stable Precambrian Baltic Shield to the subsiding Danish Basin and Danish-Polish Trough. The Hettangian-Sinemurian Sose Bugt Member (Rønne Formation) of Bornholm includes lacustrine, fluvial and restricted marine, estuarine deposits reflecting the basin-margin position. Biostatigraphic resolution is poor and a sequence stratigraphic interpretation of the paralic succession is far from straightforward. A multidisciplinary approach including facies analysis, recognition and lateral trading of key surfaces, palynostratigraphy, palynofacies, coal petrography, palaeopedology, clay mineralogy and source rock geochemistry is applied in order to obtain a high degree of precision in the interpretation of the paralic facies. In this way four sequences are recognized in the overall backstepping lacustrine to estuarine succession. Marine and marginal marine parasequences are distinguished from their purely lacustrine analogues, and an internally consistent sequence stratigraphic scheme is proposed. This is compared and tentatively correlated with fossiliferous marine sediments in the Danish Basin and with published eustatic cycle charts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1995.tb02105.x
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  • 5
    Electronic Resource
    Electronic Resource
    The crystal structures of IrAs3 and IrSb3 (1961)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 14 (1961), S. 1065-1070 
    Details
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0365110X61003053
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  • 6
    Electronic Resource
    Electronic Resource
    Speciation of four selenium compounds using high performance liquid chromatography with on-line detection by inductively coupled plasma mass spectrometry or flame atomic absorption spectrometry (1997)
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 591-598 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An analytical method for the speciation of selenomethionine, selenocystine, selenite and selenate by high performance liquid chromatography (HPLC) with atomic spectrometric detection is presented. An organic polymeric strong anion exchange column was used as the stationary phase in combination with an aqueous solution of 6 mmol L–1 of salicylate ion at pH 8.5 as the mobile phase which allowed the isocratic separation of the four selenium analytes within 8 minutes. The separated selenium species were detected on-line by flame atomic absorption spectrometry (FAAS) or inductively coupled plasma mass spectrometry (ICP-MS). The signal-to-noise ratio of the FAAS detector was optimized using a hydrogen-argon entrained-air flame and a slotted-tube atom trap (STAT) in the flame. The limit of detection (3 σ) achieved by the HPLC-FAAS system was 1 mg L–1 of selenium (100 μL injections) for each of the four selenium species. More powerful selenium detection was achieved using an ELAN 5000 ICP-MS instrument. Selenium was measured at m/z = 82. The ICP-MS signal intensity was enhanced by a factor of 3–4 after addition of 3% methanol to the chromatographic mobile phase and by using an increased plasma power input of 1300 W. The limit of detection achieved under these conditions was 1 μg L–1 (100 μL injections). The HPLC-ICP-MS system was used for selenium speciation of selenite and selenate in aqueous solutions during a BCR certification exercise and for selenium speciation in the certified reference material, BCR No. 402 White Clover. Extraction experiments revealed that the selenium species in the biological material were extractable only in the presence of water in the extraction medium. The results indicated that selenate and a compound of unknown identity U were present in the plant sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050475
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  • 7
    Electronic Resource
    Electronic Resource
    Plankton dynamics in the marginal ice zone of the central Barents Sea during spring: carbon flow and structure of the grazer food chain (1996)
    Springer
    Polar biology 16 (1996), S. 115-128 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plankton community structure was analysed during spring at four stations along a transect from the polar ice into open waters of the Barents Sea. The transect mimicks a time span of months in the biological succession during the Arctic summer. The significance of the microbial food web vs the more classical food web was evaluated using carbon budget models. The standing stocks of diatom-dominated phytoplankton and bacteria were generally high especially in connection to ice. The biomass of microzooplankton, dominated by heterotrophic dinoflagellates was significantly high, with specific growth rates following the in situ temperature. The mean ± SE specific growth rate was 0.40±0.12 d−1 for ciliates and 0.24 ± 0.05 d−1 for heterotrophic dinoflagellates, indicating no food limitation. The estimated total carbon requirement for microzooplankton was, at the ice-covered station, approximately 100% of the daily primary production, decreasing to 25% in the open water. Carbon-specific secondary production of the copepodsCalanus finmarchicus (Gunnerus),C. glacialis (Jaschnov),C. hyperboreus (Krøyer) andMetridia longa (Lubbock) were analysed by egg production.C. finmarchicus andM. longa were productive at all stations, including the ice-covered locations, with a maximum at 0.08 d−1 and 0.035 d−1, respectively. The other, more Arctic-related,Calanus spp. were virtually outspawned. The standing stock of copepods was only 10–20% of the total microbial grazer biomass. The community growth and grazing by copepods showed significantly less quantitative importance for the pelagic carbon flow than the microbial processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02390432
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  • 8
    Electronic Resource
    Electronic Resource
    A sinusoidal current-phase relation for superconducting thin-film microbridges (1972)
    Springer
    Journal of low temperature physics 7 (1972), S. 99-117 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Superconducting systems separated by a very short weak link are treated using the one-dimensional Ginzburg—Landau theory. It is shown that in the limit of extremely narrow and/or dirty links I ∼ sin Δφ. In the dirty limit we obtain the well-known expression for the Josephson tunnel current. However, the normal tunnel resistance has been replaced by the resistance of the link in the normal state. The theoretical results are compared with our experimental investigations on thin-film microbridges of the Dayem type. Deviations from a sinusoidal current—phase relation are discussed in connection with microwave-induced subharmonic steps sometimes observed in the current—voltage characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00629122
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  • 9
    Electronic Resource
    Electronic Resource
    A NUMERICAL MODEL FOR THREE-DIMENSIONAL RUN-UP (1997)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 24 (1997), S. 913-931 
    Details
    ISSN: 0271-2091
    Keywords: run-up ; Lagrangian co-ordinates ; finite differences ; slide-generated waves ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A Lagrangian finite difference model for non-dispersive (long) and fully non-linear surface waves is presented. The Lagrangian description enables the inclusion of run-up and back-wash at sloping shores. The numerical procedure has been verified through a series of tests, including systematic grid refinements and comparison with analytical solutions for run-up.Results for a few cases with moderately complex geometries are presented. The run-up distribution on an idealized headland is computed and discussed in view of the involved physical mechanisms. Some cases involve a time-dependent bottom topography, corresponding to a moving slide penetrating the fluid surface. The numerical solution procedure appears to be robust, unless wave breaking is encountered, and grid refinement tests show fast convergence once the scales in the problems are resolved.The presented work has been carried out under the GITEC and GITEC-TWO projects that have been funded by the European Commission, under the contracts EVCV-CT92-0175, ENV4-U96-0297, and by the Norwegian Research Council. © 1997 by John Wiley & Sons, Ltd. Int. j. numer. methods fluids 24: 913-931, 1997.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Violence of dust explosions in integrated systems (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Process Safety Progress 14 (1995), S. 131-138 
    Details
    ISSN: 1066-8527
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prs.680140207
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