abstract：:Parathyroid Hormone (PTH) stimulates calcium entry into bone cells in vitro, and this effect has been proposed to mediate the actions of PTH on bone. Using cells harvested from infant rat calvaria by collagenase digestion, we evaluated the sensitivity and specificity of this phenomenon. Calcium uptake was temperature ...

journal_title：Calcified tissue international

authors： Marcus R,Orner FB

更新日期：1980-01-01 00:00:00

abstract：:Prior exposure to PTH markedly decreased the responsiveness of isolated, cultured bone cells to the stimulatory effect of the hormone on cyclic AMP formation. This process of desensitization developed within 30 min, persisted during prolonged incubation of the cells in PTH-free medium, and could not be attributed to e...

journal_title：Calcified tissue international

authors： Peck WA,Kohler G

更新日期：1980-01-01 00:00:00

abstract：:Several phosphoprotein preparations (phosvitin, rat incisor and fetal calf molar dentin phosphoproteins) all inhibit apatite growth/replication from pre-existing crystal seeds in metastable solutions. Two stages of the crystal growth process were inhibited by these phosphoproteins. First an initial lag period was indu...

journal_title：Calcified tissue international

authors： Termine JD,Eanes ED,Conn KM

更新日期：1980-01-01 00:00:00

abstract：:The potassium pyroantimonate technique was utilized for the selective subcellular localization of calcium in the mandibular condylar cartilage of 1-day-old rats. Electron dense calcium pyroantimonate precipitates were localized principally in mitochondria and at the cell membrane of the chondrocytes. In addition, smal...

journal_title：Calcified tissue international

authors： Morris DC,Appleton J

更新日期：1980-01-01 00:00:00

abstract：:Thyroparathyroidectomized rats fed a diet containing 1.2% calcium, 0.55% phosphorus maintain normal serum levels of these ions. Treatment of such rats with parathyroid extract (PTE; 20 U/100 g twice daily; 10 days) has no statistically significant effect on rates of bone formation, matrix apposition, or osteoid matura...

journal_title：Calcified tissue international

authors： Rader JI,Howard GA,Feist E,Turner RT,Baylink DJ

更新日期：1979-11-01 00:00:00

abstract：:An organ culture system has been developed whereby mechanical stress can be applied to cranial sutures under controlled experimental conditions. The application of a continuous tensile mechanical stress (30 g) to cranial sutures from newborn rabbits (1--2 days) was accompanied by a significant increase in the incorpor...

journal_title：Calcified tissue international

authors： Meikle MC,Reynolds JJ,Sellers A,Dingle JT

更新日期：1979-10-31 00:00:00

abstract：:Pyrolyzed scales, fin spines, and bone from the ray-finned bony fish Polypterus (Actinopterygii) showed two mineral phases on X-ray diffraction: hydroxyapatite (HA), Ca5(PO4)3OH, and whitlockite, Ca3(PO4)2. The ratio of HA/whitlockite varied with the structure (scale, spine, bone) within each individual fish. The rela...

journal_title：Calcified tissue international

authors： Meinke DK,Skinner HC,Thomson KS

更新日期：1979-08-24 00:00:00

abstract：:Proline biosynthetic and degradative enzymes are unevenly distributed in differentiated mammalian tissues. Activities of the synthetic enzymes are relatively high in collagenous tissues, whereas activities of the degradative enzymes are high in noncollagenous tissues. In order to further characterize tissue-specific p...

journal_title：Calcified tissue international

authors： Smith RJ,Reddi AH,Phang JM

更新日期：1979-07-03 00:00:00

abstract：:The perilacunar areas of low mineral density in microradiographs from cortical bone of patients with hypophosphatemic (vitamin D-resistant) rickets are not evenly distributed throughout the bone tissue. Their frequency and distribution were determined in bone from 9 patients with this disease. It was found that the le...

journal_title：Calcified tissue international

authors： Choufoer JH,Steendijk R

更新日期：1979-04-17 00:00:00

abstract：:Using a combination of gel filtration and DEAE-cellulose chromatography, together with small-scale preparative polyacrylamide gel electrophoresis, we isolated five proteins (amelogenins) from demineralized bovine fetal dental enamel matrix. These purified proteins were characterized by amino acid analysis and gel elec...

journal_title：Calcified tissue international

authors： Fincham AG

更新日期：1979-03-13 00:00:00

abstract：:Parameters of mineral metabolism were examined in 6 patients with moderately severe anticonvulsant drug-induced osteomalacia. Compared to 15 matched controls, the patients exhibited significantly reduced serum calcium, inorganic phosphate, and 25-hydroxyvitamin D concentration, elevated serum alkaline phosphatase and ...

journal_title：Calcified tissue international

authors： Hahn TJ,Halstead LR

更新日期：1979-03-13 00:00:00