The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Christian Defarge - One of the best experts on this subject based on the ideXlab platform.
-
reply to reply to comments on defining Biominerals and organominerals direct and indirect indicators of life perry et al sedimentary geology 201 157 179 by r s perry and m a sephton sedimentary geology 213 2009 156
Sedimentary Geology, 2010Co-Authors: Christian Defarge, Pascale Gautret, Joachim Reitner, Jean TrichetAbstract:This is a reply to R.S. Perry and M.A. Sephton's “Reply to comments on defining Biominerals and organominerals: direct and indirect indicators of life [Perry et al., Sedimentary Geology, 201, 157–179]” [Sedimentary Geology 213 (2009) 156].
-
defining organominerals comment on defining Biominerals and organominerals direct and indirect indicators of life by perry et al 2007 sedimentary geology 201 157 179
Sedimentary Geology, 2009Co-Authors: Christian Defarge, Pascale Gautret, Joachim Reitner, Jean TrichetAbstract:The paper by Perry et al. (2007, Defining Biominerals and organominerals: Direct and indirect indicators of life, Sedimentary Geology, 201, 157-179) proposes to introduce “the new term ‘organomineral'” to describe mineral products whose formation is induced by by-products of biological activity, dead and decaying organisms, or nonbiological organic compounds, to be distinguished from the biomineral components of living organisms. The substantive ‘organomineral', however, is not new: it was first introduced in 1993, with basically the same definition and distinction from Biominerals, at the 7th International Symposium on Biomineralization (Defarge and Trichet, 1995, From Biominerals to ‘organominerals': The example of the modern lacustrine calcareous stromatolites from Polynesian atolls, Bulletin de l'Institut Oceanographique de Monaco, n° spec. 14, vol. 2, pp. 265-271). Thereafter, more than twenty-five papers by various authors have been devoted to organominerals and organomineral formation (‘organomineralization') processes. Only two of these papers are cited by Perry et al., and without any reference to the definitions, or even the terms ‘organomineral' or ‘organomineralization', which they included. Moreover, Perry et al. tend to enlarge the original concept of organomineral to encompass all minerals containing organic matter, whether these organic compounds are active or passive in the mineralization, which introduces ambiguities detrimental to a fine understanding of present and past geobiological processes. Finally, Perry et al. propose to consider organominerals as indirect biosignatures that could be used in the search for evidence of life in the geological record and extraterrestrial bodies. This latter proposition also is problematical, in that organominerals may be formed in association with prebiotic or abiotic organic matter.
Jean Trichet - One of the best experts on this subject based on the ideXlab platform.
-
reply to reply to comments on defining Biominerals and organominerals direct and indirect indicators of life perry et al sedimentary geology 201 157 179 by r s perry and m a sephton sedimentary geology 213 2009 156
Sedimentary Geology, 2010Co-Authors: Christian Defarge, Pascale Gautret, Joachim Reitner, Jean TrichetAbstract:This is a reply to R.S. Perry and M.A. Sephton's “Reply to comments on defining Biominerals and organominerals: direct and indirect indicators of life [Perry et al., Sedimentary Geology, 201, 157–179]” [Sedimentary Geology 213 (2009) 156].
-
defining organominerals comment on defining Biominerals and organominerals direct and indirect indicators of life by perry et al 2007 sedimentary geology 201 157 179
Sedimentary Geology, 2009Co-Authors: Christian Defarge, Pascale Gautret, Joachim Reitner, Jean TrichetAbstract:The paper by Perry et al. (2007, Defining Biominerals and organominerals: Direct and indirect indicators of life, Sedimentary Geology, 201, 157-179) proposes to introduce “the new term ‘organomineral'” to describe mineral products whose formation is induced by by-products of biological activity, dead and decaying organisms, or nonbiological organic compounds, to be distinguished from the biomineral components of living organisms. The substantive ‘organomineral', however, is not new: it was first introduced in 1993, with basically the same definition and distinction from Biominerals, at the 7th International Symposium on Biomineralization (Defarge and Trichet, 1995, From Biominerals to ‘organominerals': The example of the modern lacustrine calcareous stromatolites from Polynesian atolls, Bulletin de l'Institut Oceanographique de Monaco, n° spec. 14, vol. 2, pp. 265-271). Thereafter, more than twenty-five papers by various authors have been devoted to organominerals and organomineral formation (‘organomineralization') processes. Only two of these papers are cited by Perry et al., and without any reference to the definitions, or even the terms ‘organomineral' or ‘organomineralization', which they included. Moreover, Perry et al. tend to enlarge the original concept of organomineral to encompass all minerals containing organic matter, whether these organic compounds are active or passive in the mineralization, which introduces ambiguities detrimental to a fine understanding of present and past geobiological processes. Finally, Perry et al. propose to consider organominerals as indirect biosignatures that could be used in the search for evidence of life in the geological record and extraterrestrial bodies. This latter proposition also is problematical, in that organominerals may be formed in association with prebiotic or abiotic organic matter.
Pascale Gautret - One of the best experts on this subject based on the ideXlab platform.
-
reply to reply to comments on defining Biominerals and organominerals direct and indirect indicators of life perry et al sedimentary geology 201 157 179 by r s perry and m a sephton sedimentary geology 213 2009 156
Sedimentary Geology, 2010Co-Authors: Christian Defarge, Pascale Gautret, Joachim Reitner, Jean TrichetAbstract:This is a reply to R.S. Perry and M.A. Sephton's “Reply to comments on defining Biominerals and organominerals: direct and indirect indicators of life [Perry et al., Sedimentary Geology, 201, 157–179]” [Sedimentary Geology 213 (2009) 156].
-
defining organominerals comment on defining Biominerals and organominerals direct and indirect indicators of life by perry et al 2007 sedimentary geology 201 157 179
Sedimentary Geology, 2009Co-Authors: Christian Defarge, Pascale Gautret, Joachim Reitner, Jean TrichetAbstract:The paper by Perry et al. (2007, Defining Biominerals and organominerals: Direct and indirect indicators of life, Sedimentary Geology, 201, 157-179) proposes to introduce “the new term ‘organomineral'” to describe mineral products whose formation is induced by by-products of biological activity, dead and decaying organisms, or nonbiological organic compounds, to be distinguished from the biomineral components of living organisms. The substantive ‘organomineral', however, is not new: it was first introduced in 1993, with basically the same definition and distinction from Biominerals, at the 7th International Symposium on Biomineralization (Defarge and Trichet, 1995, From Biominerals to ‘organominerals': The example of the modern lacustrine calcareous stromatolites from Polynesian atolls, Bulletin de l'Institut Oceanographique de Monaco, n° spec. 14, vol. 2, pp. 265-271). Thereafter, more than twenty-five papers by various authors have been devoted to organominerals and organomineral formation (‘organomineralization') processes. Only two of these papers are cited by Perry et al., and without any reference to the definitions, or even the terms ‘organomineral' or ‘organomineralization', which they included. Moreover, Perry et al. tend to enlarge the original concept of organomineral to encompass all minerals containing organic matter, whether these organic compounds are active or passive in the mineralization, which introduces ambiguities detrimental to a fine understanding of present and past geobiological processes. Finally, Perry et al. propose to consider organominerals as indirect biosignatures that could be used in the search for evidence of life in the geological record and extraterrestrial bodies. This latter proposition also is problematical, in that organominerals may be formed in association with prebiotic or abiotic organic matter.
Joachim Reitner - One of the best experts on this subject based on the ideXlab platform.
-
reply to reply to comments on defining Biominerals and organominerals direct and indirect indicators of life perry et al sedimentary geology 201 157 179 by r s perry and m a sephton sedimentary geology 213 2009 156
Sedimentary Geology, 2010Co-Authors: Christian Defarge, Pascale Gautret, Joachim Reitner, Jean TrichetAbstract:This is a reply to R.S. Perry and M.A. Sephton's “Reply to comments on defining Biominerals and organominerals: direct and indirect indicators of life [Perry et al., Sedimentary Geology, 201, 157–179]” [Sedimentary Geology 213 (2009) 156].
-
defining organominerals comment on defining Biominerals and organominerals direct and indirect indicators of life by perry et al 2007 sedimentary geology 201 157 179
Sedimentary Geology, 2009Co-Authors: Christian Defarge, Pascale Gautret, Joachim Reitner, Jean TrichetAbstract:The paper by Perry et al. (2007, Defining Biominerals and organominerals: Direct and indirect indicators of life, Sedimentary Geology, 201, 157-179) proposes to introduce “the new term ‘organomineral'” to describe mineral products whose formation is induced by by-products of biological activity, dead and decaying organisms, or nonbiological organic compounds, to be distinguished from the biomineral components of living organisms. The substantive ‘organomineral', however, is not new: it was first introduced in 1993, with basically the same definition and distinction from Biominerals, at the 7th International Symposium on Biomineralization (Defarge and Trichet, 1995, From Biominerals to ‘organominerals': The example of the modern lacustrine calcareous stromatolites from Polynesian atolls, Bulletin de l'Institut Oceanographique de Monaco, n° spec. 14, vol. 2, pp. 265-271). Thereafter, more than twenty-five papers by various authors have been devoted to organominerals and organomineral formation (‘organomineralization') processes. Only two of these papers are cited by Perry et al., and without any reference to the definitions, or even the terms ‘organomineral' or ‘organomineralization', which they included. Moreover, Perry et al. tend to enlarge the original concept of organomineral to encompass all minerals containing organic matter, whether these organic compounds are active or passive in the mineralization, which introduces ambiguities detrimental to a fine understanding of present and past geobiological processes. Finally, Perry et al. propose to consider organominerals as indirect biosignatures that could be used in the search for evidence of life in the geological record and extraterrestrial bodies. This latter proposition also is problematical, in that organominerals may be formed in association with prebiotic or abiotic organic matter.
Karlheinz Mann - One of the best experts on this subject based on the ideXlab platform.
-
in depth high accuracy proteomics of sea urchin tooth organic matrix
Proteome Science, 2008Co-Authors: Karlheinz Mann, Albert J Poustka, Matthias MannAbstract:The organic matrix contained in Biominerals plays an important role in regulating mineralization and in determining biomineral properties. However, most components of biomineral matrices remain unknown at present. In sea urchin tooth, which is an important model for developmental biology and biomineralization, only few matrix components have been identified. The recent publication of the Strongylocentrotus purpuratus genome sequence rendered possible not only the identification of genes potentially coding for matrix proteins, but also the direct identification of proteins contained in matrices of skeletal elements by in-depth, high-accuracy proteomic analysis. We identified 138 proteins in the matrix of tooth powder. Only 56 of these proteins were previously identified in the matrices of test (shell) and spine. Among the novel components was an interesting group of five proteins containing alanine- and proline-rich neutral or basic motifs separated by acidic glycine-rich motifs. In addition, four of the five proteins contained either one or two predicted Kazal protease inhibitor domains. The major components of tooth matrix were however largely identical to the set of spicule matrix proteins and MSP130-related proteins identified in test (shell) and spine matrix. Comparison of the matrices of crushed teeth to intact teeth revealed a marked dilution of known intracrystalline matrix proteins and a concomitant increase in some intracellular proteins. This report presents the most comprehensive list of sea urchin tooth matrix proteins available at present. The complex mixture of proteins identified may reflect many different aspects of the mineralization process. A comparison between intact tooth matrix, presumably containing odontoblast remnants, and crushed tooth matrix served to differentiate between matrix components and possible contributions of cellular remnants. Because LC-MS/MS-based methods directly measures peptides our results validate many predicted genes and confirm the existence of the corresponding proteins. Knowledge of the components of this model system may stimulate further experiments aiming at the elucidation of structure, function, and interaction of biomineral matrix components.
-
the sea urchin strongylocentrotus purpuratus test and spine proteomes
Proteome Science, 2008Co-Authors: Karlheinz Mann, Albert J Poustka, Matthias MannAbstract:Background The organic matrix of Biominerals plays an important role in biomineral formation and in determining biomineral properties. However, most components of biomineral matrices remain unknown at present. In sea urchin, which is an important model organism for developmental biology and biomineralization, only few matrix components have been identified and characterized at the protein level. The recent publication of the Strongylocentrotus purpuratus genome sequence rendered possible not only the identification of possible matrix proteins at the gene level, but also the direct identification of proteins contained in matrices of skeletal elements by in-depth, high-accuracy, proteomic analysis.
-
proteomic analysis of the acid soluble organic matrix of the chicken calcified eggshell layer
Proteomics, 2006Co-Authors: Karlheinz Mann, Boris Macek, Jesper V OlsenAbstract:The major difference between inorganic minerals and Biominerals is the presence of an organic matrix consisting of proteins, glycoproteins, proteoglycans, and polysaccharides, which is synthesized by specialized cells under genetic control before or during mineralization. The organic matrix is thought to play a major role in the assembly of the biomineral and determination of its mechanical properties. The recent elucidation of the chicken genome provided an opportunity to explore the matrix proteome of a biomineral using up-to-date MS-based technology. We identified 520 proteins in this matrix including the ten matrix proteins already known before. The identified proteins were divided into three abundance groups using the exponentially modified protein abundance index described recently which was roughly calibrated with the few known data on protein yield derived from Edman sequence analysis. A small group of 32 highly abundant proteins contained the presently known eggshell-specific proteins and all of the other known eggshell matrix constituents identified before with much less sensitive conventional methods. The present study, which is the first comprehensive proteomic study of a vertebrate biomineral, is intended as a starting point for the detailed molecular characterization of eggshell matrix proteins, their interactions in the matrix network and functional studies.
-
the major soluble 19 6 kda protein of the organic shell matrix of the freshwater snail biomphalaria glabrata is an n glycosylated dermatopontin
Biochimica et Biophysica Acta, 2003Co-Authors: Julia C Marxen, Manfred Nimtz, Wilhelm Becker, Karlheinz MannAbstract:The major Biomphalaria glabrata shell matrix protein of 19.6 kDa was isolated by preparative electrophoresis and sequenced. The sequence of 148 amino acids showed 32% sequence identity to mammalian dermatopontin sequences and 34-37% identity to two invertebrate dermatopontins described previously. A unique feature of the shell matrix dermatopontin was the presence of a single N- glycosylation consensus sequence, the asparagine of which was completely modified with a pentasaccharide. Sequence analysis of this short N-glycan by mass spectrometry and carbohydrate composition analysis indicated that it was the ubiquitous N-glycan core oligosaccharide with the exception that the terminal mannoses were 3-O-methylated. Dermatopontin is widespread in mammalian extracellular matrices, including the matrix of Biominerals such as bone and teeth. Its occurrence in an invertebrate biomineral indicates that such phylogenetically distant biomineral-forming systems as vertebrate bone and mollusk shell share components which have undergone surprisingly few changes during a long evolution. D 2003 Elsevier B.V. All rights reserved.