منابع مشابه
Microwave Irradiation of Nanohydroxyapatite from Chicken Eggshells and Duck Eggshells
Due to similarity in composition to the mineral component of bones and human hard tissues, hydroxyapatite with chemical formula Ca10(PO4)6(OH)2 has been widely used in medical field. Both chicken and duck eggshells are mainly composed of calcium carbonate. An attempt has been made to fabricate nanohydroxyapatite (nHA) by chicken (CES) and duck eggshells (DES) as calcium carbonate source (CaCO3)...
متن کاملTextural analysis of eggshells
We discuss an experimental protocol to measure the degree of preferred orientation by using a textural index (T) consisting of a single parameter easily derived from X-ray diffraction data recovered with a powder diffractometer. This textural index can be used for a quantitative characterization of the development of crystallographic orientation in biominerals and biomimetic materials which in ...
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Recently, Le Bohec et al. (1) inferred that king penguins (Aptenodytes patagonicus) are at heavy extinction risk under current global warming predictions. Although their demographic modeling was elegant, they based further inferences on results showing that warm El Niño–Southern Oscillation events negatively affect both breeding success and adult survival. Although the results are interesting, ...
متن کاملWhy frequencies are natural
Research in mathematical cognition has shown that rates, and other interpretations of x/y, are hard to learn and understand. On the other hand, there is extensive evidence that the brain is endowed with a specialized mechanism for representing and manipulating the numerosities of sets – that is, frequencies. Hence, base-rates are neglected precisely because they are rates, whereas frequencies a...
متن کاملWhy are operations cancelled?
preoccupied and irritable and had to absent themselves. In addition, some resisted overeating by keeping limited amounts of food at home, and this complicated their child's feeding. The mothers' overconcern with shape and weight seemed also to have had an effect. It militated against breast feeding and was associated with undue concern about the children's shape and weight, which in turn affect...
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ژورنال
عنوان ژورنال: The Auk
سال: 2004
ISSN: 1938-4254,0004-8038
DOI: 10.1093/auk/121.1.148