منابع مشابه
CALCIUM PHOSPHATE CEMENT: STUDY OF (BETA-TRICALCIUM PHOSPHATE, DICALCIUM PHOSPHATE AND CALCIUM CARBONATE SYSTEM
Calcium phosphate cements (CPCs), using B-tricalcium phosphate (ß-TCP, Ca3 (P04)2), dicalcium phosphate (DCP, CaHP04), calcium carbonate (Ca CO3), and hydroxylapatite (HAp, Ca10(P04)6(OH)2) as powder cement and disodium hydrogen phosphate (Na2HP04) solution as liquid component were prepared. After mixing the powder and liquid constituents, injectable and self-setting calcium phosphate cements (...
متن کاملSeasonal variability of soil phosphate stable oxygen isotopes in rainfall manipulation experiments
Phosphorus (P) availability limits productivity in many ecosystems worldwide. As a result, improved understanding of P cycling through soil and plants is much desirable. The use of the oxygen isotopes associated to phosphate can be used to study the cycle of P in terrestrial systems. However, changes with time in the oxygen isotopes associated to available P have not yet been evaluated under fi...
متن کاملMechanism of negative cooperativity in glyceraldehyde-3-phosphate dehydrogenase deduced from ligand competition experiments.
It is shown that the modulation in the negative cooperativity of ligand binding by another, competing ligand that binds noncooperatively is accounted for exclusively by the ligand-induced sequential model. It is therefore suggested that whenever such a phenomenon is observed it argues strongly in favor of the sequential model. The advantages and limitations of this approach are evaluated. The b...
متن کاملStudies of Bone of Patients with Hyperparathydroidismi by Means of Phosphate Exchange Experiments in Vitro
The history of the interpretation of osteitis fibrosa cystica generalisata as it was described in 1891 by von Recklinghausen (1) explains why the skeletal abnormalities were for so long considered to be the focal point of the clinical concept "hyperparathyroidism." During the 1930's, however, it was observed that many patients with hyperparathyroidism showed no bone abnormalities on either hist...
متن کاملPhosphate: the Silent Challenge
Phosphorus (P) is one of the most vital elements for all living organisms which acts as aconstituent of essential biomolecules such as nucleic acids, phospholipids, and phosphosugars,and as a major contributor to almost all metabolic reactions including photosynthesis,respiration, and energy delivery. It is one of the most needed nutrients for plant growth anddevelopment. Despite high levels of...
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ژورنال
عنوان ژورنال: Science
سال: 1917
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.45.1157.213-a