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  • 1
    Digitale Medien
    Digitale Medien
    Size at birth of live-born Saudi infants (1984)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 91 (1984), S. 0 
    Details
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Summary. Anthropometric measurements were done on 967 singleton live-born Saudi infants of gestational age 33 to 42 weeks who belonged to the high and middle social classes and who were born consecutively in Riyadh University Hospital. The 914 infants born at term (≥37 weeks) had a mean birthweight of 3.31 kg (SD 0.45), a mean length of 49.74 cm (SD 2.5) and a mean head circumference of 34.4 cm (SD 1.4). Values were significantly higher in males than females. Effect of sex in this study was not apparent until 40 weeks and later. Difference in body size was significant between the first-born and second infants but the trend was unimpressive with greater parity. Fifty-three (5.5%) of the infants were born preterm. Twenty-one of the preterm babies and 18 of the term infants weighed 〈2500 g, an overall incidence of low birthweight of 4%. Results were compared with studies from Saudi Arabia and other countries. It is concluded that there was no significant difference between birthweights of upper-class Saudis and Europeans.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-0528.1984.tb04737.x
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  • 2
    Digitale Medien
    Digitale Medien
    The effect of custom tray material type and fabrication technique on tensile bond strength of impression material adhesive systems (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 30 (2003), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: summary  The purpose of this investigation was to evaluate the tensile bond strengths of two impression material systems (polysulphide and polyvinyl siloxane) to two custom tray materials [autopolymerizing and visible light-cured (VLC) acrylic resin]. The effect of polymerizing the tray materials directly against wax spacer and tinfoil was evaluated for each material. Polymerizing tray materials against tinfoil significantly increased the bond strengths of polysulphide and polyvinyl siloxane impression materials to VLC and autopolymerizing acrylic resin tray materials. Polyvinyl siloxane VLC cured against tinfoil combination produced the strongest bond. The VLC resin tray material generated greater bond strength than autopolymerizing acrylic resin when polymerized against tinfoil.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2842.2003.01023.x
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  • 3
    Digitale Medien
    Digitale Medien
    OPTIMIZATION OF CAROTENE RECOVERY FROM HYDROLYZED PALM OLEIN IN ADSORPTION COLUMN CHROMATOGRAPHY USING RESPONSE SURFACE METHODOLOGY (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food lipids 11 (2004), S. 0 
    Details
    ISSN: 1745-4522
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Response Surface Methodology (RSM) for optimization of carotene recovery from hydrolyzed palm olein (HCPOlein) in adsorption chromatography was carried out. The level and interaction of three independent variables was investigated: column temperature (50 to 60C), oil loading (25 to 200 g), and mobile phase flow rate (6 to 60 mL/min). Based on the response as percentage of carotene recovery from 50 g of HP-20 adsorbent, the optimum conditions were achieved at 200 g of oil loading, column temperature at 55C, and flow rate at 33 mL/min. Up to 98% of carotene recovery was obtained under these conditions. Interaction of oil-oil, oil-flow rate and flow rate-flow rate could enhance the percentage of carotene recovery. However, oil and flow rate as single factors could significantly reduce percentage of carotene recovery. Oil loading as a single factor could positively influence the amount of carotene adsorbed. However, flow rate as a single factor and oil-oil interaction could negatively influence the amount of carotene adsorbed. The mean of difference (MD) of the experimental and predicted data for percentage of carotene recovery and the amount of carotene adsorbed were very small, −0.0067 and 0.0133, respectively. The probability (P) value showed no significant lack-of-fit for both equations in this model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1745-4522.2004.tb00259.x
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  • 4
    Digitale Medien
    Digitale Medien
    RECOVERY OF PALM CAROTENE FROM PALM OIL AND HYDROLYZED PALM OIL BY ADSORPTION COLUMN CHROMATOGRAPHY (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food lipids 9 (2002), S. 0 
    Details
    ISSN: 1745-4522
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Crude palm oil and crude palm olein were hydrolyzed with lipase from Candida rugosa to produce a free fatty acid (FFA) rich oil. The percentages of FFA produced and carotene degradation after the hydrolysis process were determined. The palm oil and hydrolyzed palm oil were subsequently subjected to column chromatography. Diaion HP-20 adsorbent was used for reverse phase column chromatography at 50C. Isopropanol or ethanol, and n-hexane were used as the first and second eluting solvents, respectively. The objective of hydrolyzing the palm oil was to produce more polar FFA-rich oil in order to enhance the nonpolar carotene bind to the nonpolar HP-20 adsorbent in the column chromatography process. Hydrolyzing palm oil with lipase from Candida rugosa gave 30- and 60-fold, respectively, of FFA in the crude palm oil and crude palm olein in 24 h at 50C. Approximately, 15.56 and 17.48% of carotene degraded in crude palm oil and crude palm olein, respectively. For column chromatography, using isopropanol or ethanol as the first eluting solvent, unhydrolyzed oil and hydrolyzed oil showed the carotene recovery infraction two (carotene-rich fraction) of about 36–37 and 90–96%, respectively. Over 90% of carotene recovery was obtained from
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1745-4522.2002.tb00211.x
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  • 5
    Digitale Medien
    Digitale Medien
    Comparative pharmacokinetic study of oral and rectal formulations of artesunic acid in healthy volunteers (1998)
    Springer
    European journal of clinical pharmacology 54 (1998), S. 411-414 
    Details
    ISSN: 1432-1041
    Schlagwort(e): Key words Artesunic acid ; Pharmacokinetics ; Malaria
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Abstract Objective: A single cross-over, comparative pharmacokinetic study of oral and rectal formulations of 200 mg artesunic acid in 12 healthy Malaysian volunteers is reported. Methods: Plasma concentrations of artesunic acid and dihydroartemisinin were determined simultaneously by HPLC with electrochemical detection. The test drug was well tolerated and no undesirable adverse effects were observed. Results: Comparison of pharmacokinetic parameters of artesunic acid after oral and rectal administration showed statistically significant differences in t max and AUC, with no changes for C max and t 1/2. As for dihydroartemisinin, differences were observed for t max and C max but not for AUC. Conclusion: There appear to be pharmacokinetic differences between oral and rectal modes of administration. The significance of these findings should be explored in malaria patients before appropriate therapeutic regimens are devised.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002280050484
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  • 6
    Digitale Medien
    Digitale Medien
    Microbial and enzyme activity in soils amended with a natural source of easily available carbon (1996)
    Springer
    Biology and fertility of soils 21 (1996), S. 177-183 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Key words Heterotrophic microorganisms ; Nitrification ; P solubilization ; S oxidation ; Soil enzymes ; Sugar beet
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract The addition of sugar beet to soils as a source of C led to an increase in the availability of easily utilizable C (glucose), which in turn markedly increased numbers of soil bacteria and of the yeast Williopsis californica. Nitrification, P solubilization, urea hydrolysis (and the subsequent nitrification of liberated NH) were stimulated by this amendment. The stimulation of nitrification may have been a result of increased heterotrophic nitrification. In contrast, the concentration of sulphate in S0-amended soils declined following amendment, presumably as the result of enhanced S immobilization. Activity of the enzymes amylase, aryl sulphatase, invertase, phosphatase, dehydrogenase, and urease were all stimulated by the sugar beet amendment. These results suggest that sugar beet amendment could be used to increase the rate of release of plant-available ions from fertilizers such as insoluble phosphates. Problems may arise, however, from a subsequent increase in nitrification and reduced sulphate availability.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00335931
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  • 7
    Digitale Medien
    Digitale Medien
    Do tides affect water quality in the upper phreatic zone of a small oceanic island, Sipadan Island, Malaysia? (1997)
    Springer
    Environmental geology 29 (1997), S. 112-117 
    Details
    ISSN: 1432-0495
    Schlagwort(e): Key words Water quality ; Tidal change ; Upper phreatic zone ; Oceanic island
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract  Sipadan Island is a small oceanic island with limited storage of fresh groundwater. A study was carried out to determine the effect of tidal change on the groundwater quality of such an island using temperature, dissolved oxygen content, conductivity, salinity, and pH values as indicators. Overall, the results indicated that the groundwater quality changes with tides, but the trends of fluctuation differs between the observed parameters. It was found that the percentages of changes during the period of study were 0.8% (temperature), 53% (dissolved oxygen), 61% (conductivity), 58% (salinity), and 1.7% (pH) at the centre of the island; and 0.9% (temperature), 33% (dissolved oxygen), 40% (conductivity), 42% (salinity), and 9% (pH) at a station 120 m from the coast, based on 2.9-m and 2.8-m tidal ranges at each station.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002540050109
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  • 8
    Digitale Medien
    Digitale Medien
    Microbial and enzyme activity in soils amended with a natural source of easily available carbon (1996)
    Springer
    Biology and fertility of soils 21 (1996), S. 177-183 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Heterotrophic microorganisms ; Nitrification ; P solubilization ; S oxidation ; Soil enzymes ; Sugar beet
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract The addition of sugar beet to soils as a source of C led to an increase in the availability of easily utilizable C (glucose), which in turn markedly increased numbers of soil bacteria and of the yeast Williopsis californica. Nitrification, P solubilization, urea hydrolysis (and the subsequent nitrification of liberated NH inf4 sup+ ) were stimulated by this amendment. The stimulation of nitrification may have been a result of increased heterotrophic nitrification. In contrast, the concentration of sulphate in So-amended soils declined following amendment, presumably as the result of enhanced S immobilization. Activity of the enzymes amylase, aryl sulphatase, invertase, phosphatase, dehydrogenase, and urease were all stimulated by the sugar beet amendment. These results suggest that sugar beet amendment could be used to increase the rate of release of plant-available ions from fertilizers such as insoluble phosphates. Problems may arise, however, from a subsequent increase in nitrification and reduced sulphate availability.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00335931
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  • 9
    Digitale Medien
    Digitale Medien
    Substitution of yttrium by strontium in YBa2Cu3O7−δ superconductors (1996)
    Springer
    Journal of materials science 15 (1996), S. 205-207 
    Details
    ISSN: 1573-4811
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00274452
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  • 10
    Digitale Medien
    Digitale Medien
    Trace elements in human fingernails: Measurement by proton-induced X-ray emission (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 82 (1984), S. 111-124 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract The method of proton particle-induced X-ray emission (proton PIXE) has been employed to study the trace element composition of human fingernails. The samples were colleted from 51 subjects randomly selected from a working community of about 500 adults and they were analyzed by the thick-target external beam technique of the PIXE method. The samples were exposed to the proton beam as 1-mm thick pellets and irradiated with 2 MeV protons having 20 nA beam intensity. For 40 μC irradiations, the concentration of fourteen elements, K, Ca, Ti, Mn, Fe, Ni, Cu, Zn, As, Se, Br, Rb, Sr and Pb, were measured by comparison with a calibration obtained from the NBS orchard leaf standard (SRM 1571). Some anomalous cases have been revealed from this study and they are attributed to environmental factors. The frequency distributions of the elements are presented and the results compared with available data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02227334
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