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  • 1
    ISSN: 1435-5604
    Schlagwort(e): Key words Rat ; Ethanol ; Femur ; Lumbar spine ; Dual-energy X-ray absorptiometry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Abuse of alcohol may derange bone metabolism and cause osteoporosis. Due to confounding factors associated with alcohol abuse, e.g., dietary deficiencies and liver damage, a study using an animal model is preferable to examine whether alcohol itself actually reduces bone density. We evaluated the effect of alcohol intake on bone in rats by dual-energy X-ray absorptiometry. Six-week-old male (n = 16) and female (n = 16) Wister rats were divided into two groups. Sixteen alcohol-exposed rats (8 male and 8 female) were fed Lieber's liquid diet and 16 control rats (8 male and 8 female) were fed a control liquid diet. The bone mineral density (BMD) and bone mineral content (BMC) of the right femur were measured before and after experimental feeding under anesthesia. The BMD of lumbar spine (L2–L4) of sacrificed rats was measured. For male rats, BMD and BMC decreased significantly in the alcohol group (P = 0.0132 and 0.0133, respectively) but did not decrease in control group. For female rats, BMD and BMC decreased significantly in the alcohol group (P = 0.0012 and 〈0.0001, respectively) but did not decrease in the control group. For male rats, the mean ratio of BMD after experimental feeding divided by BMD before experimental feeding was significantly lower in the alcohol group than in the control group (P = 0.0031). For female rats, the mean ratio of BMD after experimental feeding divided by BMD before experimental feeding was also lower in the alcohol group than in the control group (P = 0.0002). For male rats, the mean BMD of L2–L4 after experimental feeding was significantly lower in the alcohol group than in the control group (P = 0.0210). For female rats, the mean BMD of L2–L4 after experimental feeding was also significantly lower in the alcohol group than in the control group (P = 0.0006). These results indicate that alcohol intake decreased the BMD of rats in both spongy and cortical bone, and that the reduction of BMD was greater in female rats than in male rats.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 212-213 
    ISSN: 1618-2650
    Schlagwort(e): Best. von Phosphat ; Elektroden, ionenselektive ; bleiselektive Elektrode
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Summary A lead ion-sensitive electrode responds to phosphate ion, and is successfully used for the determination of the ion in the concentration range of 10−5–10−1 M at a pH of 7–9 in the presence of 0.1 M sodium perchlorate and 5×10−2 M ammonium sulphate-ammonium hydroxide as ionic strength adjuster and pH buffer, respectively. The slope of the calibration curves is about −19 mV per decade of the concentration. The response reaches equilibrium within several min after immersing the electrode in the phosphate solution. Common anions, as F−, Cl−, Br−, NO 3 − , NO 2 − and HCO 3 s- , have little effect on the determination of phosphate ion, but OH−, HAsO 4 2− and I− affect it.
    Notizen: Zusammenfassung Die Phosphatbestimmung kann im Bereich 10−5 bis 10−1 M bei pH 7–9 in Gegenwart von 0,1 M Natriumperchlorat und 5×10−2 M Ammoniumsulfat/ Ammoniumhydroxid zur Einstellung der Ionenstärke und als Puffer durchgeführt werden. Die Neigung der Eichkurve beträgt etwa −19 mV je Zehnerpotenz der Phosphatkonzentration. Wenige Minuten nach Eintauchen der Elektrode wird eine konstante Anzeige erreicht. Übliche Ionen, wie F−, Cl−, Br−, NO 3 − , NO 2 − und HCO 3 − , haben nur einen geringen Einfluß auf die Bestimmung, während OH−, HAsO 4 2− und J− stören.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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