Central role of pyrophosphate in acellular cementum formation.

BackgroundInorganic pyrophosphate (PP(i)) is a physiologic inhibitor of hydroxyapatite mineral precipitation involved in regulating mineralized tissue development and pathologic calcification.Local levels of PP(i) are controlled by antagonistic functions of factors that decrease PP(i) and promote mineralization (tissue-nonspecific alkaline phosphat

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El Rakin, conteo mapuche, un conocimiento con valor de uso

This study is based on the numbering system and way of counting of the Mapuche people.The need to quantify made these people create their own Rakin (count), making the path to a perfect decimal numbering system that has been passed down orally from generation to generation.In this way, this system has no symbols to represent numbers.The Rakin, as s

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Volcanic caves of East Africa - an overview

Numerous Tertiary to recent volcanoes are located in East Africa.Thus, much of the region is made up volcanic rock, which hosts the largest and greatest variety of East Africas caves.Exploration of volcanic caves has preoccupied members Pads of Cave Exploration Group of East Africa (CEGEA) for the past 30 years.The various publications edited by CE

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