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  • 1
    Digitale Medien
    Digitale Medien
    Discharge frequency dependence of particulate growth in high frequency silane plasmas (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3880-3882 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Discharge frequency dependence of growth of particulates is studied in high frequency silane plasmas. Particulates appear earlier after discharge initiation and the increasing rate of their amount in the subsequent phase decreases with increasing the discharge frequency from 3.5 to 28 MHz. Even in the early phase of their formation for all 3.5–28 MHz discharges, particulates grow principally around the plasma/sheath boundary near the powered electrode, where short lifetime radicals are actively generated. For 28 MHz, the density of particulates in the early discharge phase is extremely high (≥1011 cm3). The latter two features suggest that many short lifetime neutral radicals (such as SiH2), being produced at a high rate, significantly contribute to the nucleation and initial growth of one particulate, at least, for a relatively high power density of the order of 0.5 W/cm2. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.115304
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  • 2
    Digitale Medien
    Digitale Medien
    Effect of increased concentration of soil CO2 on intermittent flushes of seed germination in Echinochloa crus-galli var. crus-galli (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 21 (1998), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Soil-buried seeds of barnyardgrass (Echinochloa crus-galli var. crus-galli) germinated from April to June in three intermittent flushes. The later two flushes of germination occurred after heavy rainfall. Carbon dioxide concentration in soil air transiently increased to 30 dm3 m–3 after the rainfall, probably due to the increase in soil temperature and water potential. Germination of exhumed seeds was stimulated by exposure to CO2 at 30 dm3 m–3. Fluctuating temperature, light, water, ethylene, and nitrate are known to promote seed germination in many species. However, of these environmental factors, within ranges found in the field, only CO2 was effective in enhancing the germination of barnyardgrass seeds. We conclude that soil CO2 is responsible for causing intermittent flushes of germination. Detection of vegetation gaps may be explained by the responsiveness of buried seeds to CO2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-3040.1998.00347.x
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  • 3
    Digitale Medien
    Digitale Medien
    Geodesic surfactant structures (1995)
    [s.l.] : Nature Publishing Group
    Nature 378 (1995), S. 21-21 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SIR - Structures formed by the self-association of amphiphiles (liquid crystals, vesicles and micelles) excite interest because of their potential uses as vectors for drug and gene delivery (see, for exam-ple, ref. 1), and as matrices from which new structured materials can be made (for example, ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/378021a0
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  • 4
    Digitale Medien
    Digitale Medien
    High urinary excretion level of citrate and magnesium in children: potential etiology for the reduced incidence of pediatric urolithiasis (1998)
    Springer
    Urological research 26 (1998), S. 209-213 
    Details
    ISSN: 1434-0879
    Schlagwort(e): Key words Citrate ; Magnesium ; Calcium oxalate crystallization ; Children ; Inhibitory activity ; Metastable limit
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract It is well known that the incidence of calcium oxalate (CaOX) urolithiasis is much lower in children than in adults [2, 21]. One purpose of this study was to compare the inhibitory activity on CaOX crystal growth and nucleation of urine from children (ufC) with that of urine from adults (ufA). Another was to measure low molecular weight urinary substances related to CaOX lithiasis, including citrate and magnesium, which have been identified as stone inhibitors. The excretion volume per body weight of uric acid, phosphorus, magnesium and citrate was all significantly higher in 24-h ufC than in 24-h ufA, but that of calcium and oxalate was not. The growth inhibitory activities against CaOX crystals of ufC and ufA were measured in a whole urine system. The diameter of the crystals produced in this system was smaller for ufC (3.68 μm) than for ufA (4.66 μm). We also examined the metastable limit for CaOX with fresh spot urine, which was 3.15 mmol/l in ufC and 0.41 mmol/l in ufA. These results indicate that ufC has a more powerful inhibitory effect on CaOX crystal growth and nucleation than ufA. We also found that the excretion rate of citrate and magnesium in ufC was much higher than in ufA. We suggest that these two stone inhibitors are very likely to elevate the inhibitory activity of ufC against CaOX crystal growth and nucleation. The lower incidence of CaOX lithiasis in children might thus be partly attributed to citrate and magnesium.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002400050048
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  • 5
    Digitale Medien
    Digitale Medien
    Characterization of protein components of human urinary crystal surface binding substance (1997)
    Springer
    Urological research 25 (1997), S. 355-360 
    Details
    ISSN: 1434-0879
    Schlagwort(e): Calcium oxalate ; Crystallization Protein inhibitor ; Crystal surface binding substance Prothrombin ; Osteopontin
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We previously extracted crystal surface binding substance (CSBS) from human urine and showed that it appeared to constitute a substantial proportion of urinary macromolecular inhibitors of calcium oxalate crystallization. CSBS was isolated from human urine and fractionated by three consecutive chromatography procedures in order to characterize protein inhibitors of calcium oxalate crystallization. Sodium dodecylsulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and NH2-terminal amino acid sequencing revealed that inhibitory fractions eluted from a final, hydroxyapatite column contained prothrombin and osteopontin. Hydroxyapatite column fractions also contained other, unidentified protein inhibitors of calcium oxalate crystallization. CSBS contained also human serum albumin, α1-acid glycoprotein, α2-microglobulin, α2-HS glycoprotein, retinol-binding protein, transferrin, and Tamm-Horsfall protein, but these proteins seemed to play no direct role in inhibitory activity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294665
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  • 6
    Digitale Medien
    Digitale Medien
    Conversion of Palmitate to Respiratory Carbon Dioxide by Foetal Tissue of Man and Monkey (1970)
    [s.l.] : Nature Publishing Group
    Nature 227 (1970), S. 963-964 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] We attempted to show that the foetus is able to degrade fatty acids in vitro. Slices of placenta, brain, liver and lung from human and monkey foetuses obtained at various periods of gestation by interruption of normal gestation were studied. Each incubating vessel contained 2-2 mmoles of purified ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/227963a0
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  • 7
    Digitale Medien
    Digitale Medien
    Antiinflammatory potency of dehydrocurdione, a zedoary-derived sesquiterpene (1998)
    Springer
    Inflammation research 47 (1998), S. 476-481 
    Details
    ISSN: 1420-908X
    Schlagwort(e): Key words: Dehydrocurdione — Zedoary — Antiinflammatory drug — Antioxidant — Electron paramagnetic resonance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract. Objective and Design: Dehydrocurdione, a sesquiterpene isolated from zedoary, was tested for in vivo and in vitro antiinflammatory actions.¶Materials: Analgesic effect was tested in ICR mice by the acetic acid-induced writhing method. Antipyretic effect was studied in Sprague-Dawley rats treated with baker's yeast. Antiinflammatory activities were tested in Wistar rats with carrageenan-induced paw edema and adjuvant-induced chronic arthritis. In vitro analyses included the capabilities to inhibit cyclooxygenase activity, and to scavenge free radicals as determined by electron paramagnetic resonance (EPR).¶Results: Oral administration of dehydrocurdione (40 to 200 mg/kg) mitigated the writhing reflex induced by acetic acid and the fever elicited by baker's yeast. A higher dose (200 mg/kg) of dehydrocurdione was required to inhibit the carrageenan-induced paw edema. Oral administration of dehydrocurdione at 120 mg/kg/day for 12 days significantly reduced chronic adjuvant arthritis. Unlike indomethacin (IC50: 0.1 μM), dehydrocurdione showed minimal cyclooxygenase inhibition. However, dehydrocurdione (100 μM to 5 mM) significantly reduced free radical formation from hydrogen peroxide and ferrous iron determined by EPR spectrometry using 5,5′-dimethyl-l-pyrroline-N-oxide as a spin trap agent.¶Conclusion: In addition to the well-known effect of zedoary as a stomachic, dehydrocurdione, the major component of Curcuma zedoaria Roscoe has antiinflammatory potency related to its antioxidant effect.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s000110050361
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  • 8
    Digitale Medien
    Digitale Medien
    Fatigue crack growth of polycarbonate under high pressures (1995)
    Springer
    Journal of materials science 30 (1995), S. 1083-1086 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract In order to investigate the effect of hydrostatic pressure on the fatigue crack growth behaviour of solid polymers, an apparatus was designed for maximum pressure of 3000 kgf cm−2. The crack growth rates as a function of stress intensity factor range, δK, were measured using compact tension specimens of polycarbonate under pressures of 1–2000 kgf cm−2. It was shown that (1) the fatigue crack growth rates at pressures higher than 500 kg cm−2 were nearly insensitive to hydrostatic pressure, (2) the slope on a log (dc/dN) versus log (δK) diagram was higher at the high pressures than at an atmospheric pressure, and (3) shear lips and the tear lines appeared on the fracture surfaces at atmospheric pressure, while they were not observed at pressures higher than 500 kgf cm−2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01178449
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  • 9
    Digitale Medien
    Digitale Medien
    Synthesis of titanium nitride by a spark-discharge method in liquid ammonia (1996)
    Springer
    Journal of materials science 31 (1996), S. 2495-2499 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Titanium nitride powders were synthesized by the spark-discharge method in liquid ammonia at — 78 to 130 °C and 3.5–10.5 kV discharge voltage using titanium pellets as the starting materials. Titanium nitride possessing nitrogen defect, TiN1−x (x≃0.5), was obtained as the main product, together with small amounts of α-Ti alloyed with nitrogen. The increase in temperature of the liquid ammonia resulted in an increase in the titanium nitride content in the product but a decrease in the powder production rate. By calcining the mixed powders of TiN1−x and α-Ti in a nitrogen atmosphere around 1200 °C, stoichiometric TiN was obtained as single phase.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01152967
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  • 10
    Digitale Medien
    Digitale Medien
    Synthesis of γ-iron by a spark discharge method in liquid ammonia (1995)
    Springer
    Journal of materials science 14 (1995), S. 1430-1432 
    Details
    ISSN: 1573-4811
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00462205
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