نتایج جستجو برای: biomineralization

تعداد نتایج: 1859  

Journal: :Journal of the American Chemical Society 2021

Journal: :Microscopy and Microanalysis 2018

2004
Jae-Woo Kim Sang H. Choi Peter T. Lillehei Glen C. King Gerald D. Watt Sang-Hyon Chu Yeonjoon Park Sheila Thibeault

Platinum-cored ferritins were synthesized as electrocatalysts by electrochemical biomineralization of immobilized apoferritin with platinum. The platinum cored ferritin was fabricated by exposing the immobilized apoferritin to platinum ions at a reduction potential. On the platinum-cored ferritin, oxygen is reduced to water with four protons and four electrons generated from the anode. The ferr...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2013
Jens Baumgartner Guillaume Morin Nicolas Menguy Teresa Perez Gonzalez Marc Widdrat Julie Cosmidis Damien Faivre

The iron oxide mineral magnetite (Fe3O4) is produced by various organisms to exploit magnetic and mechanical properties. Magnetotactic bacteria have become one of the best model organisms for studying magnetite biomineralization, as their genomes are sequenced and tools are available for their genetic manipulation. However, the chemical route by which magnetite is formed intracellularly within ...

2014
Kirill S. Golokhvast Ivan V. Seryodkin Vladimir V. Chaika Alexander M. Zakharenko Igor E. Pamirsky

We discuss, from the aspect of phylogeny, the interrelationships of the phytolith types in plants from the main taxonomical groups (algae, lichens, horsetails, gymnosperms, and floral plants) with homologues of known proteins of biomineralization. Phytolith morphotypes in various phylogenetic plant domains have different shapes. We found that, in ancient types of plants (algae, horsetails, and ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2013
Junyu Xiao Vincent S Tagliabracci Jianzhong Wen Soo-A Kim Jack E Dixon

The family with sequence similarity 20 (Fam20) kinases phosphorylate extracellular substrates and play important roles in biomineralization. Fam20C is the Golgi casein kinase that phosphorylates secretory pathway proteins within Ser-x-Glu/pSer motifs. Mutations in Fam20C cause Raine syndrome, an osteosclerotic bone dysplasia. Here we report the crystal structure of the Fam20C ortholog from Caen...

Journal: :Angewandte Chemie 2012
Julyan H E Cartwright Antonio G Checa Julian D Gale Denis Gebauer C Ignacio Sainz-Díaz

Although the polymorphism of calcium carbonate is well known, and its polymorphs--calcite, aragonite, and vaterite--have been highly studied in the context of biomineralization, polyamorphism is a much more recently discovered phenomenon, and the existence of more than one amorphous phase of calcium carbonate in biominerals has only very recently been understood. Here we summarize what is known...

2010
RICHARD B. FRANKEL BRIGID R. HEYWOOD STEPHEN MANN JOHN W. KING

A slowly moving, rod-shaped magnetotactic bacterium was found in relatively large numbers at and below the oxic-anoxic transition zone of a semianaerobic estuarine basin. Unlike all magnetotactic bacteria described to date, cells of this organism produce single-magnetic-domain particles of an iron oxide, magnetite (Fe3 0 4), and an iron sulfide, greigite (Fe3 S4), within their magnetosomes. The...

2012
Magdalena Wojtas Piotr Dobryszycki Andrzej Ożyhar

Intrinsically disordered proteins (IDPs) have the potential to play a unique role in the study of proteins and the relationships between structure and function. Intrinsic disorder affects chemical and cellular events such as cell signaling, macromolecular self-assembly, protein removal and crystal nucleation and growth. This chapter explores the structural principles by which IDPs act and revea...

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