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  • Articles  (6)
  • Phosphate  (6)
  • Springer  (6)
  • American Chemical Society
  • American Geophysical Union
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  • 2000-2004
  • 1970-1974  (6)
  • 1930-1934
  • 1974  (6)
  • Physics  (6)
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  • Articles  (6)
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  • Springer  (6)
  • American Chemical Society
  • American Geophysical Union
  • De Gruyter
  • Emerald
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  • 2000-2004
  • 1970-1974  (6)
  • 1930-1934
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 16 (1974), S. 89-92 
    ISSN: 1432-0827
    Keywords: Age ; Bone culture ; Calcium ; Phosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract Calvaria taken from mice aged 0, 1, 3 and 5 days were cultured for 48 h, in control medium (no added hormone), or in the presence of PTH (0.5 U/ml) or CT (50 mCl/ml). In the control group, there was a shift from net uptake of Ca and P (0- and 1-day bones) to net release (5-day bones). CT-treated bones of all ages took up Ca from the culture medium, but the percentage uptake declined with increasing age. Bones exposed to PTH released Ca and P to the culture medium, regardless of age. The changes with increasing age may be related to an increase in mineralization and other aspects of maturation in these bones.
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  • 2
    ISSN: 1432-0827
    Keywords: Serum ; Calcium ; Phosphate ; Alkaline phosphatase ; Kidney
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract In 30 patients with chronic renal insufficiency (16 non-dialysed and 14 on dialysis) serum calcium, phosphate and alkaline phosphatase were determined and, in a crest biopsy specimen, morphometric determinations of bone qualities were calculated. A positive correlation was established between serum alkaline phosphatase, the osteoblast surface and the active resorption surface in both dialysed and non-dialysed patients. A positive correlation was also established between the osteoblast surface and the active resorption. In the non-dialysed patients a negative correlation was established between serum calcium and the osteoid surface.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 16 (1974), S. 219-226 
    ISSN: 1432-0827
    Keywords: Bone ; Phosphate ; ATP ; Calcium ; Mitochondria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract An active constituent of the leaves ofSolanum malacoxylon (SM) is shown to promote calcium resorption and citrate production in embryonic chick frontal bone culturedin vitro. When injected into rats, SM reduces the ATP content of liver and kidneys. This phenomenon may be related to the ability of SM to stimulate mitochondrial ATPase activity at pH 9.4. SM significantly reduces the concentration of phosphate necessary to alter the uptake of calcium and respiration of siolated mitochondria. The data suggest that SM influences calcium and phosphate metabolism by affecting ion movements into and out of mitochondria.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 14 (1974), S. 31-48 
    ISSN: 1432-0827
    Keywords: Bone ; Cartilage ; Calcification ; Collagen ; Phosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Une méthode pour l'étude de la croissance des os longs de foetus de rat, en culture d'organe, dans un milieu chimiquement défini, a été mise au point. Les extrémités cartilagineuses et les parties centrales de l'os sont analysées séparément pour leur croissance et minéralisation en étudiant leur contenu en collagène, calcium et phosphate, poids sec, et incorporation de proline marquée en hydroxyproline. La croissance et la minéralisation des parties centrales osseuses sont plus lentes dans un milieu chimiquement défini qu'in vivo. La croissance peut être accélérée en ajoutant au milieu des acides aminés non essentiels, de l'albumine ou du sérum. Les extrémités cartilagineuses présentent une augmentation plus importante en poids et contenu en collagène que les parties centrales et l'adjonction de diverses substances a moins d'effet sur la croissance. La croissance et la minéralisation des parties centrales sont augmentées en élevant la concentration du milieu en phosphate de 1.5 à 4.5 mM, avec ou sans adjonction de sérum ou d'albumine. A une concentration faible de calcium (0.5 mM), la croissance et la minéralisation des parties centrales sont arrêtées. A une concentration faible en magnésium (0.5 mM), la minéralisation est augmentée, mais la croissance est arrêtée.
    Abstract: Zusammenfassung Es wird eine Methode beschrieben, mit welcher das Wachstum der Röhrenknochen von Rattenembryos in einem chemisch bestimmten Medium in Organkultur untersucht werden kann. Die Knorpelenden und Knochenschäfte wurden gesondert auf Wachstum und Mineralisation geprüft, indem Collagen-, Calcium- und Phosphatgehalt, das Trockengewicht und der Einbau von markiertem Prolin in Hydroxyprolin gemessen wurden. Wachstum und Mineralisation des Knochenschaftes waren langsamer in einem chemisch bestimmten Medium als in vivo. Das Wachstum konnte beschleunigt werden, indem dem Medium nicht-essentielle Aminosäuren, Albumin oder Serum beigegeben wurden. Die Knorpelenden zeigten eine viel stärkere Zunahme an Gewicht und Collagengehalt als die Schäfte, und Anreicherung des Mediums hatte weniger Wirkung auf ihr Wachstum. Das Wachstum und die Mineralisation der Knochenschäfte nahmen zu, wenn die Phosphatkonzentration im Medium zwischen 1,5 und 4,5 mM erhöht wurde, und zwar unabhängig davon, ob dem Medium Serum oder Albumin beigegeben wurde oder nicht. Bei niederer Calciumkonzentration (0,5 mM) im Medium wurden Wachstum und Mineralisation der Knochenschäfte beeinträchtigt. Bei niedriger Magnesiumkonzentration (0,5 mM) wurden die Mineralisation erhöht, das Wachstum hingegen gehemmt.
    Notes: Abstract A method for studying the growth of fetal rat long bones in a chemically defined medium in organ culture is described. Cartilage ends and bone shafts were analyzed separately for growth and mineralization by measuring the collagen, calcium, and phosphate content, dry weight, and incorporation of labeled proline into hydroxyproline. Growth and mineralization of the bone shaft were slower in a chemically defined medium thanin vivo. Growth could be enhanced by supplementation of the medium with non-essential amino acids, albumin or serum. Cartilage ends showed a greater increase in weight and collagen content than the shafts, and medium supplements had less effect on their growth. Bone shaft growth and mineralization were enhanced by increasing medium phosphate concentration over a range of 1.5 to 4.5 mM whether or not the medium was supplemented with serum or albumin. At a low medium calcium concentration (0.5 mM) bone shaft growth and mineralization were impaired. At a low magnesium concentration (0.5 mM) mineralization was enhanced, but growth was impaired.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 15 (1974), S. 143-152 
    ISSN: 1432-0827
    Keywords: Rat incisor ; Enamel ; Microdissection ; Phosphate ; 32P incorporation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract To determine the sites at which ions were incorporated into the forming enamel of the rat incisor, the incorporation of32P-labelled phosphate has been studiedin vivo at different time intervals after intraperitoneal injection with the32P andin vitro. The enamel from the lower incisor teeth was dissected into a series of about twenty pieces and the variation in specific activity (S.A.) from the root apex to the mature tissue determined. In general, S.A. was high in the early forming enamel falling towards the maturing tissue. Ten minutes after injection, this fall was interrupted by one or sometimes two areas of relatively high S.A. One occurred at the beginning of the maturation zone and persisted until the enamel was worn away by attrition at the incisal tip. This seemed to reflect the acquisition of phosphate by accretion during enamel maturation. The second S.A. peak, which occurred in the earlier forming enamel, tended to appear at short intervals after injection and was rarely observed when the period after injection was extended to 24h. A S.A. peak at the same site was produced in the forming enamel when incisors were incubatedin vitro in32P phosphate. This second peak therefore seemed to reflect some change in the tissue's physical or chemical properties rather than cellular activity. No S.A. peak was obtainedin vitro in the maturing tissue.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 15 (1974), S. 287-293 
    ISSN: 1432-0827
    Keywords: Calcium ; Phosphate ; Inhibition ; Crystallization ; Nucleotides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The 5′-triphosphates of adenosine, guanosine, uridine, and cytidine inhibited the crystallization of calcium phosphate from stable supersaturated solutions that had been seeded with crystals of hydroxyapatite. Concentrations of the nucleoside triphosphates in the micromolar range were sufficient to have a significant effect on the crystal growth process. Diphosphate and monophosphate derivatives had less effect on the precipitation of calcium phosphate. It is possible that the nucleoside triphosphates may play a beneficial role in regulating intracellular calcification, particularly in disease states in which calcium entry into cells is pathologically high.
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