Racquel Zapanta LeGeros's research while affiliated with CUNY Graduate Center and other places
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Publications (3)
In order to explain the expanded a-axis of human enamel apatite (9.441 Å) compared to that of synthetic (prepared at 900 °C) or mineral (Holly Springs, Ga.) OH-apatite (), the incorporation of chloride in apatites prepared from aqueous systems at 70–100 °C was studied. These synthetic (Cl, OH)-apatites were prepared either by precipitation or by hy...
Crystallographic, spectroscopic and chemical studies demonstrate the presence of two distinct types of calcium phosphates deposits in tissues of patients with chronic renal failure. Deposits found in periarticular calcifications are carbonate-containing apatite, while those found in calcified visceral tissues are either microcrystallites of magnesi...
Citations
... 18 As use of sevelamer was associated with a lower calcium level, this suggests a vital role for serum calcium levels in enhancing vascular calcification. 19 X-ray diffraction patterns of these two types show tumoral calcification to give apatitie pattern and visceral calcification, an amorphous one. Presence of magnesium may promote formation of this latter type of calcium deposit by disturbing crystallization of apatite and stabilizing amorphous phase as observed in synthetic systems. ...
... The stretching modes ν1 and ν3 of CO 3 2are shown by the peaks at ~1470 and ~1421 cm − 1 respectively, while the bending mode ν2 of CO 3 2− is represented by the peak at around 875 cm − 1 [76,77]. The broad band at ~1640 cm − 1 represents the bending mode of water [78,79]. While 40Mg appears to also form a phosphate peak at day 7, both the relative intensity and signal were very low. ...
... The prevalence of HAp in bones makes [ 18 www.nature.com/scientificreports/ composition of extraosseous calcification (EC), which is defined as "deposition of calcium in tissues outside of bone" 20 and includes conditions such as vascular calcification, are diverse and contradictory [21][22][23][24][25][26][27][28][29][30][31][32] . These calcifications are often euphemistically called HAp as a blanket term for all forms of apatite or solid calcium-containing mineral. ...
