Abstract：
:Ribbon-like crystals, from developing enamel of human fetuses, were studied by high resolution electron microscopy. These crystals were classically described as the first organized mineral formed during amelogenesis. They were characterized by a mean width-to-thickness ratio (W.T-1) of 9.5, and 40% were bent. On lattice images we noted the presence of the central dark line (CDL) associated with white spots. Both structures were found in crystals with a minimum thickness of 8-10 nm. CDLs were localized in the center of the crystals and seemed to be linked to the initial growth process, but their exact structure and function were not fully determined. We were able to study the structure of the ribbon-like crystals with a Scherzer resolution close to 0.2 nm. The good correspondence between experimental and computed images showed that their structure was related to hydroxyapatite (HA). In addition, the presence of ionic substitutions and deficiencies were also compatible with HA. In this study, about 50% of the crystals showed structural defects. Screw dislocations were the most often noted defects and were observed within crystals aligned along five different zone axes. Low- and high-angle boundaries were also detected. Low-angle boundaries, found in the center of the crystals, could thus be related to CDLs and be implicated in the nucleation step of crystal formation, whereas high-angle boundaries could result from the fusion of ribbon-like crystals. Such mechanisms could induce an acceleration of the growth in thickness of the crystal observed during the maturation stage of amelogenesis.
journal_name
Calcif Tissue Intjournal_title
Calcified tissue internationalauthors
Cuisinier FJ,Steuer P,Senger B,Voegel JC,Frank RMdoi
10.1007/BF00334485subject
Has Abstractpub_date
1992-10-01 00:00:00pages
259-68issue
4eissn
0171-967Xissn
1432-0827journal_volume
51pub_type
杂志文章abstract：:To investigate the possible role of calmodulin in the calcium sensitivity of parathyroid adenylate cyclase (AC), the effect of the calmodulin inhibitor trifluoperazine hydrochloride (TFP) on the calcium sensitivity of forskolin-stimulated AC activity was investigated in membranes prepared from normal porcine parathyro...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02556606
更新日期：1986-05-01 00:00:00
abstract：:The present study reports on the separation of fluid from soft, "cheeselike" enamel of porcine permanent teeth in the secretory stage, and the determination of its chemical composition. The enamel tissues were dissected from mandibles of 5 to 6-month-old piglets and pooled under mineral oil in centrifuge tubes, and th...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02555250
更新日期：1987-08-01 00:00:00
abstract：:Regular exercise and physical activity (PA) are known to be protective factors for maintaining bone mineral density (BMD) and preventing osteoporotic fracture. We investigated the associations between leisure-time PA and BMD in 2,903 premenopausal and 2,267 postmenopausal women in Korea. BMDs of the lumbar spine and f...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-012-9624-3
更新日期：2012-09-01 00:00:00
abstract：:A number of osteoporotic patients under bisphosphonate treatment present persistent fragility fractures and bone loss despite good compliance. The objective of this 18-month prospective study was to investigate the effect of teriparatide [rhPTH(1-34)] in 25 female osteoporotics who were inadequate responders to oral b...
journal_title：Calcified tissue international
pub_type： 临床试验,杂志文章
doi：10.1007/s00223-011-9500-6
更新日期：2011-08-01 00:00:00
abstract：:Recent evidence of the occurrence of brushite in newly formed bone mineral prompted a study of the solubility properties of brushite:apatite mixtures under physiological conditions and the influence on them of pH, lactate, pyruvate, and, particularly, noncollagenous bone proteins (NCBPs). Brushite alone was surprising...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02411226
更新日期：1982-03-01 00:00:00
abstract：:Further insight into human tooth enamel, dense fraction (TE), has been obtained by following the change and loss of CO3(2-), OH-, structurally incorporated H2O, Cl-, and, indirectly, HPO4(2-) after TE had been heated in N2 or vacuum in the range 25-1000 degrees C. Quantitative infrared spectroscopic, lattice parameter...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02407181
更新日期：1980-01-01 00:00:00
abstract：:The bone mineral density (BMD) of the radius and spine was determined by photo absorptiometry in a large number of controls (radius: n = 111; spine: n = 85; age range: 50-79 years) and osteoporotic women (radius: n = 98; spine n = 140; age range: 50-79 years) with at least one "atraumatic" vertebral compression fractu...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02554998
更新日期：1990-04-01 00:00:00
abstract：:In the past decade there have been numerous publications reporting a significant and direct relationship between handgrip strength and bone mineral density (BMD) of the proximal femur in older adults. The present report challenges the appropriateness of the methods, and thus the conclusions used in these studies. Spec...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002239900621
更新日期：1999-04-01 00:00:00
abstract：:The effect of magnesium (Mg) supplementation on bone metabolism has been studied in the normal young mouse. Weanling male mice were given Mg-supplemented drinking water (5 mM or 32 mM Mg) for 4 weeks. Mineral and skeletal changes were assessed by biochemical methods and by histomorphometric analysis of endosteal bone ...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02405119
更新日期：1983-09-01 00:00:00
abstract：:The drawbacks of estrogen restrict the clinical use of hormone replacement therapy, and it would be most helpful to explore new estrogenic substances that could prevent bone loss and be free from any adverse effects. We synthesized a new compound named bone-seeking estrogen (SE2) by combining 17β-estradiol (E2) with i...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-013-9739-1
更新日期：2013-08-01 00:00:00
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
pub_type： 杂志文章
doi：10.1007/BF02408543
更新日期：1980-01-01 00:00:00
abstract：:The relationship between bisphosphonate-induced bone mineral density (BMD) gains and antifracture efficacy remains to be fully elucidated. Data from two antifracture studies were analyzed. Postmenopausal osteoporotic women received oral (2.5 mg daily, 20 mg intermittent) or intravenous (0.5 mg, 1 mg quarterly) ibandro...
journal_title：Calcified tissue international
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00223-010-9403-y
更新日期：2010-10-01 00:00:00
abstract：:The primary aim of the project was to determine the combined effect of whole-body electromyostimulation (WB-EMS) and protein supplements on local and overall muscle/fat distribution in older man with sarcopenic obesity (SO). Community-dwelling (cdw) men ≥ 70 years with SO were randomly allocated to a WB-EMS and protei...
journal_title：Calcified tissue international
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00223-018-0424-2
更新日期：2018-09-01 00:00:00
abstract：:The aim of our study was to compare the results provided by the measurement of vertebral and femoral bone mineral density (BMD) for assessing the individual risk of osteoporosis as defined by either low BMD and/or rapid bone loss. Vertebral and femoral BMD were measured twice at a mean interval of 21 months in 85 norm...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF00310196
更新日期：1993-05-01 00:00:00
abstract：:Ultrasonic methods measure properties intrinsic to bone's structure that are not necessarily dependent on bone mass. Therefore, ultrasound may prove to be a useful tool for diagnosing bone fragility and osteoporosis. The goal of this study was to determine the relationship between apparent velocity of ultrasound (AVU)...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02565132
更新日期：1991-08-01 00:00:00
abstract：:The developing mandibular condylar growth center consists of a number of histologically distinct cell types. There is an increase in cell volume that takes place from the condylar surface layer through the center of ossification, resulting in a disorganized, irregular cellular pattern. Consequently, the isolation and ...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF00298747
更新日期：1995-01-01 00:00:00
abstract：:The demonstration of histochemical characteristics in calcifying cartilage is fraught with methodological difficulties including the distinction of mineralized from unmineralized cartilage and the demonstration of cell detail in relatively hard tissue. This study uses the decalcified bone matrix-induced enchondral (en...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02555141
更新日期：1988-10-01 00:00:00
abstract：:It has recently been demonstrated that calcium ionophore A23187 mimics certain of the effects of parathyroid hormone (PTH) on bone in vitro, including stimulation of 45Ca release and cAMP formation. To further examine the relative effects of these two agents on bone cell metabolism, we compared the effects of syntheti...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02411291
更新日期：1982-09-01 00:00:00
abstract：:Osteocalcin, the gamma-carboxyglutamic acid-containing protein, which is the most abundant noncollagenous protein of bone and dentin, is considered to play roles in bone formation and remodeling. It is unclear how the gamma-carboxyglutamic acid side-chains in osteocalcin coordinate to Ca2+, since the X-ray structure o...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002230010042
更新日期：2001-12-01 00:00:00
abstract：:Vitamin D supplementation is recommended for women with osteoporosis. In the FOCUS-D trial comparing the combination tablet alendronate plus vitamin D3 5,600 IU (ALN/D) with standard care (SC) prescribed by patients' personal physicians, ALN/D was more effective in improving serum 25(OH)D and bone turnover markers by ...
journal_title：Calcified tissue international
pub_type： 杂志文章,多中心研究,随机对照试验
doi：10.1007/s00223-013-9763-1
更新日期：2014-02-01 00:00:00
abstract：:ATP is as effective as inorganic pyrophosphate in retarding the rate of dissolution of calcium hydroxyapatite at pH 7, ADP is less effective, and AMP is without effect. The inhibition is due to the adsorption of ATP and ADP units on the crystal surface. ...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02405386
更新日期：1984-12-01 00:00:00
abstract：:The aim of this study was to investigate the relation between birth weight and calcaneal bone stiffness in a large sample of Belgian, healthy, preadolescent children. Participants were 827 children (3.6-11.2 years, 51.6 % boys) from the Belgian cohort of the IDEFICS study. Birth weight was obtained using a parental qu...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-012-9636-z
更新日期：2012-10-01 00:00:00
abstract：:This report describes a method using direct photon absorptiometry (DPA) for determination in vivo of the bone mineral content to bone width ratio (BMC/W) in the rat femur. A significant correlation was noted between measurements by DPA and whole femur dry weight and ash weight. Measurements were reproducible within re...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02409496
更新日期：1981-01-01 00:00:00
abstract：:We assessed the bone mineral density (BMD) of 16 matched sets of cadaveric proximal femurs and feet using dual-energy x-ray absorptiometry (DXA). We also estimated the femoral neck length from the DXA scans. Quantitative ultrasound densitometry was used to measure the velocity of sound and broadband ultrasound attenua...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF00296338
更新日期：1995-02-01 00:00:00
abstract：:Bone and mineral metabolism has been reported to affect the development of the ossification of the posterior longitudinal ligament (OPLL). The aim of this study was to compare bone mineral densities (BMD) and rate of osteoporosis between cervical OPLL and a matched control group. We also investigated the correlation o...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-012-9662-x
更新日期：2013-01-01 00:00:00
abstract：:Sulfotransferase 1E1 (SULT1E1) catalyze estrogen into sulfate conjugation and is involved in the metabolism of phytoestrogen. A community-based cross-sectional study was conducted on 397 Korean women, to evaluate the association between genetic polymorphisms of SULT1E1 and bone mineral density (BMD) and the combined e...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-006-0008-4
更新日期：2006-09-01 00:00:00
abstract：:The aims of this study were to compare the response to therapy in disease activity in pagetic patients with and without skull involvement and the usefulness of bone markers in the evaluation of these patients. Forty patients with Paget's disease treated with tiludronate and 26 healthy controls were included. Serum tot...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-005-0247-9
更新日期：2006-07-01 00:00:00
abstract：:Two rheumatic syndromes associated with deposition of calcium phosphate crystals in soft tissues of the shoulder have prompted us to study the cellular mechanisms of calcium phosphate crystal solubilization. Synthetic 45Ca labeled calcium phosphate crystal aggregates were solubilized by cultured human fibroblasts or m...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02405384
更新日期：1984-12-01 00:00:00
abstract：:In order to investigate the pathogenesis of ossification of the posterior longitudinal ligament (OPLL) of the spine, we examined the distribution of insulin-like growth factor I (IGF-I) in the posterior longitudinal ligaments of OPLL patients, and analyzed the effects of IGF-I on the cultured spinal ligament cells. Fo...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002239900410
更新日期：1998-02-01 00:00:00
abstract：:The relationship between oral indicators and bone mineral density (BMD) has been studied by many investigators, with mixed and complex results. The purpose of the present cross-sectional study was to evaluate the associations of periodontal conditions and tooth loss with metacarpal BMD (m-BMD) in a community-based coh...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-004-0275-x
更新日期：2005-07-01 00:00:00
