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André R, Natalio F, Tahir MN, Berger R, Tremel W. Self-cleaning antimicrobial surfaces by bio-enabled growth of SnO2 coatings on glass. NANOSCALE 2013; 5:3447-3456. [PMID: 23475228 DOI: 10.1039/c3nr00007a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Conventional vapor-deposition techniques for coatings require sophisticated equipment and/or high-temperature resistant substrates. Therefore bio-inspired techniques for the fabrication of inorganic coatings have been developed in recent years. Inspired by the biology behind the formation of the intricate skeletons of diatoms orchestrated by a class of cationic polyamines (silaffins) we have used surface-bound spermine, a naturally occurring polyamine, to promote the fast deposition of homogeneous, thin and transparent biomimetic SnO2 coatings on glass surfaces. The bio-enabled SnO2 film is highly photoactive, i.e. it generates superoxide radicals (O2˙(-)) upon sunlight exposure resulting in a strong degradation of organic contaminants and a strong antimicrobial activity. Upon illumination the biomimetic SnO2 coating exhibits a switchable amphiphilic behavior, which - in combination with its photoactivity - creates a self-cleaning surface. The intrinsic self-cleaning properties could lead to the development of new protective, antifouling coatings on various substrates.
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Natalio F, Corrales TP, Panthofer M, Schollmeyer D, Lieberwirth I, Muller WEG, Kappl M, Butt HJ, Tremel W. Flexible Minerals: Self-Assembled Calcite Spicules with Extreme Bending Strength. Science 2013; 339:1298-302. [DOI: 10.1126/science.1216260] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Hoshyargar F, Sahoo JK, Tahir MN, Yella A, Dietzsch M, Natalio F, Branscheid R, Kolb U, Panthöfer M, Tremel W. Graphene-type sheets of Nb1−xWxS2: synthesis and in situ functionalization. Dalton Trans 2013; 42:5292-7. [DOI: 10.1039/c3dt32294g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Natalio F, Kashyap A, Lorenz S, Kerschbaumer H, Dietzsch M, Tahir MN, Duschner H, Strand S, Strand D, Tremel W. Multi-photon imaging of amine-functionalized silica nanoparticles. NANOSCALE 2012; 4:4680-4686. [PMID: 22735108 DOI: 10.1039/c2nr30660c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A convenient and simple strategy for preparing water soluble, photoluminescent functionalized silica nanoparticles (M-dots) in the absence of fluorophores or metal doping is demonstrated. These M-dots can be used for bioimaging using one and two-photon microscopy. Because of their high photostability, low toxicity and high biocompatibility compared with Lumidot™ CdSe/ZnS quantum dots, functionalized silica particles are superior alternatives for current bioimaging platforms. Moreover, the presence of a free amine group at the surface of the M-dots allows biomolecule conjugation (e.g. with antibodies, proteins) in a single step for converting these photoluminescent SiO(2) nanoparticles into multifunctional efficient vehicles for theragnostics.
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Nakhjavan B, Tahir MN, Natalio F, Panthöfer M, Gao H, Dietzsch M, Andre R, Gasi T, Ksenofontov V, Branscheid R, Kolb U, Tremel W. Ni@Fe₂O₃ heterodimers: controlled synthesis and magnetically recyclable catalytic application for dehalogenation reactions. NANOSCALE 2012; 4:4571-4577. [PMID: 22706341 DOI: 10.1039/c2nr12121b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Ni@Fe(2)O(3) heterodimer nanoparticles (NPs) were synthesized by thermal decomposition of organometallic reactants. After functionalization, these Ni@Fe(2)O(3) heterodimers became water soluble. The pristine heterodimeric NPs were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Mössbauer spectroscopy and magnetic susceptibility measurements. A special advantage of the heterodimers lies in the fact that nanodomains of different composition can be used as catalysts for the removal of environmentally hazardous halogenated pollutants.
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Natalio F, André R, Hartog AF, Stoll B, Jochum KP, Wever R, Tremel W. Vanadium pentoxide nanoparticles mimic vanadium haloperoxidases and thwart biofilm formation. NATURE NANOTECHNOLOGY 2012; 7:530-5. [PMID: 22751222 DOI: 10.1038/nnano.2012.91] [Citation(s) in RCA: 384] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Accepted: 05/09/2012] [Indexed: 05/19/2023]
Abstract
Marine biofouling--the colonization of small marine microorganisms on surfaces that are directly exposed to seawater, such as ships' hulls--is an expensive problem that is currently without an environmentally compatible solution. Biofouling leads to increased hydrodynamic drag, which, in turn, causes increased fuel consumption and greenhouse gas emissions. Tributyltin-free antifouling coatings and paints based on metal complexes or biocides have been shown to efficiently prevent marine biofouling. However, these materials can damage the environment through metal leaching (for example, of copper and zinc) and bacteria resistance. Here, we show that vanadium pentoxide nanowires act like naturally occurring vanadium haloperoxidases to prevent marine biofouling. In the presence of bromide ions and hydrogen peroxide, the nanowires catalyse the oxidation of bromide ions to hypobromous acid (HOBr). Singlet molecular oxygen ((1)O(2)) is formed and this exerts strong antibacterial activity, which prevents marine biofouling without being toxic to marine biota. Vanadium pentoxide nanowires have the potential to be an alternative approach to conventional anti-biofouling agents.
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Andre R, Tahir MN, Natalio F, Tremel W. Bioinspired synthesis of multifunctional inorganic and bio-organic hybrid materials. FEBS J 2012; 279:1737-49. [DOI: 10.1111/j.1742-4658.2012.08584.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Shukoor MI, Natalio F, Tahir MN, Barz M, Weber S, Brochhausen C, Zentel R, Schreiber LM, Brieger J, Tremel W. CpG-DNA loaded multifunctional MnO nanoshuttles for TLR9-specific cellular cargo delivery, selective immune-activation and MRI. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm16903g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Schladt TD, Koll K, Prüfer S, Bauer H, Natalio F, Dumele O, Raidoo R, Weber S, Wolfrum U, Schreiber LM, Radsak MP, Schild H, Tremel W. Multifunctional superparamagnetic MnO@SiO2 core/shell nanoparticles and their application for optical and magnetic resonance imaging. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15320c] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Wolf SE, Lieberwirth I, Natalio F, Bardeau JF, Delorme N, Emmerling F, Barrea R, Kappl M, Marin F. Merging models of biomineralisation with concepts of nonclassical crystallisation: is a liquid amorphous precursor involved in the formation of the prismatic layer of the Mediterranean Fan Mussel Pinna nobilis? Faraday Discuss 2012. [DOI: 10.1039/c2fd20045g] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Tahir MN, André R, Sahoo JK, Jochum FD, Theato P, Natalio F, Berger R, Branscheid R, Kolb U, Tremel W. Hydrogen peroxide sensors for cellular imaging based on horse radish peroxidase reconstituted on polymer-functionalized TiO₂ nanorods. NANOSCALE 2011; 3:3907-3914. [PMID: 21845257 DOI: 10.1039/c1nr10587f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We describe the reconstitution of apo-horse radish peroxidase (apo-HRP) onto TiO(2) nanorods functionalized with a multifunctional polymer. After functionalization, the horse radish peroxidase (HRP) functionalized TiO(2) nanorods were well dispersible in aqueous solution, catalytically active and biocompatible, and they could be used to quantify and image H(2)O(2) which is a harmful secondary product of cellular metabolism. The shape, size and structure of TiO(2) nanorods (anatase) were analyzed by transmission electron microscopy (TEM), high resolution TEM (HRTEM), electron diffraction (ED) and X-ray diffraction (XRD). The surface functionalization, HRP reconstitution and catalytic activity were confirmed by UV-Vis, FT-IR, CLSM and atomic force microscopy (AFM). Biocompatibility and cellular internalization of active HRP reconstituted TiO(2) nanorods were confirmed by a classical MTT cytotoxicity assay and confocal laser scanning microscopy (CLSM) imaging, respectively. The intracellular localization allowed H(2)O(2) detection, imaging and quantification in HeLa cells. The polymer functionalized hybrid system creates a complete sensor including a "cell positioning system" in each single particle. The flexible synthetic concept with functionalization by post-polymerization modification allows introduction of various dyes for sensitisation at different wavelengths and introduction of various anchor groups for anchoring on different particles.
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Lukic-Bilela L, Perovic-Ottstadt S, Walenta S, Natalio F, Plese B, Link T, Müller WEG. ATP distribution and localization of mitochondria in Suberites domuncula (Olivi 1792) tissue. ACTA ACUST UNITED AC 2011; 214:1748-53. [PMID: 21525322 DOI: 10.1242/jeb.053439] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The metabolic energy state of sponge tissue in vivo is largely unknown. Quantitative bioluminescence-based imaging was used to analyze the ATP distribution of Suberites domuncula (Olivi 1792) tissue, in relation to differences between the cortex and the medulla. This method provides a quantitative picture of the ATP distribution closely reflecting the in vivo situation. The obtained data suggest that the highest ATP content occurs around channels in the sponge medulla. HPLC reverse-phase C-18, used for measurement of ATP content, established a value of 1.62 μmol ATP g⁻¹ dry mass in sponge medulla, as opposed to 0.04 μmol ATP g⁻¹ dry mass in the cortex, thus indicating a specific and defined energy distribution. These results correlate with the mitochondria localization, determined using primary antibodies against cytochrome oxidase c subunit 1 (COX1) (immunostaining), as well as with the distribution of arginine kinase (AK), essential for cellular energy metabolism (in situ hybridization with AK from S. domuncula; SDAK), in sponge sections. The highest energy consumption seemed to occur in choanocytes, the cells that drive the water through the channel system of the sponge body. Taken together, these results showed that the majority of energetic metabolism in S. domuncula occurs in the medulla, in the proximity of aqueous channels.
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Nicolai M, Gonçalves G, Natalio F, Humanes M. Biocatalytic formation of synthetic melanin: the role of vanadium haloperoxidases, L-DOPA and iodide. J Inorg Biochem 2011; 105:887-93. [PMID: 21507323 DOI: 10.1016/j.jinorgbio.2011.03.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2010] [Revised: 03/21/2011] [Accepted: 03/21/2011] [Indexed: 11/17/2022]
Abstract
The vanadium haloperoxidase (V-HPO) enzyme, extracted from the brown alga Laminaria saccharina, is able to catalyze the formation of a black precipitate, using as precursor the amino acid L-dopa in the presence of hydrogen peroxide and iodide, in one-pot synthesis. The L-dopa oxidation is a multistep reaction with a crucial role played by the iodide in the enzyme catalyzed peroxidative production of dopachrome, a well known intermediate in the synthesis of melanin. Dopachrome is then converted to a synthetic form of melanin through a polymerization reaction. Factors, such as buffer composition and pH, influence significantly the reaction first steps, but further steps of melanin production are hardly influenced. The biosynthetic melanin produced through the combination V-HPO/I/H(2)O(2), was characterized by several spectroscopic techniques (UV-vis and FT-IR) as well as XRD. Moreover, this biopolymer is light sensitive, decomposing into oligo- and monomeric units. Scanning electron microscopy (SEM) imaging showed different morphologies when compared with commercial available melanin. The biosynthetic production of melanin can have a wide range of applications from photosensitive cells to biomedicine with the advantage of being produced under eco-friendly and mild conditions.
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Nakhjavan B, Tahir MN, Natalio F, Gao H, Schneider K, Schladt T, Ament I, Branscheid R, Weber S, Kolb U, Sönnichsen C, Schreiber LM, Tremel W. Phase separated Cu@Fe3O4 heterodimer nanoparticles from organometallic reactants. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10922g] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Natalio F, André R, Pihan SA, Humanes M, Wever R, Tremel W. V2O5 nanowires with an intrinsic iodination activity leading to the formation of self-assembled melanin-like biopolymers. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11811k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Tahir MN, Yella A, Sahoo JK, Natalio F, Kolb U, Jochum F, Theato P, Tremel W. IF-ReS2 with Covalently Linked Porphyrin Antennae. Isr J Chem 2010. [DOI: 10.1002/ijch.201000053] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Natalio F, Link T, Müller WE, Schröder HC, Cui FZ, Wang X, Wiens M. Bioengineering of the silica-polymerizing enzyme silicatein-alpha for a targeted application to hydroxyapatite. Acta Biomater 2010; 6:3720-8. [PMID: 20226280 DOI: 10.1016/j.actbio.2010.03.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2009] [Revised: 02/18/2010] [Accepted: 03/03/2010] [Indexed: 10/19/2022]
Abstract
Since its discovery, numerous biotechnological approaches have aimed to explore the silica-polymerizing catalytic activity of the enzyme silicatein. In vivo, silicatein catalyzes polymerization of amorphous silica nanospheres from soluble precursors. In vitro, it directs the formation of nanostructured biosilica. This is of interest for various applications that strive to benefit from both the advantages of the biological system (i.e., silica synthesis under physiological conditions) and the cell mineralization-stimulating effect of biosilica. However, so far immobilization of silicatein has been hampered by the complex multistep procedure required. In addition, the chemical surface modifications involved not only restrict the choice of carrier materials but also render application of silicatein to hydroxyapatite (HA) of mineralized tissue impossible. Here we describe the bioengineering of silicatein, adapted for application in the fields of bone regeneration, tissue engineering, and dental care. Inspired by Glu-rich sequences of mammalian proteins that confer binding affinity to HA, a novel protein-tag was developed, the Glu-tag. Following expression of Glu-tagged silicatein, the HA-binding capacity of the enzyme is demonstrated in combination with synthetic and dental HA. Furthermore, immobilized Glu-tagged silicatein catalyzes synthesis of biosilica coatings on both synthetic HA nanofibrils and dental HA. Hence, Glu-tagged silicatein reveals a considerable biomedical potential with regenerative and prophylactic implementations.
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Schladt TD, Shukoor MI, Schneider K, Tahir MN, Natalio F, Ament I, Becker J, Jochum FD, Weber S, Köhler O, Theato P, Schreiber LM, Sönnichsen C, Schröder HC, Müller WEG, Tremel W. Au@MnO nanoflowers: hybrid nanocomposites for selective dual functionalization and imaging. Angew Chem Int Ed Engl 2010; 49:3976-80. [PMID: 20408148 DOI: 10.1002/anie.200906689] [Citation(s) in RCA: 132] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Schladt T, Shukoor M, Schneider K, Tahir M, Natalio F, Ament I, Becker J, Jochum F, Weber S, Köhler O, Theato P, Schreiber L, Sönnichsen C, Schröder H, Müller W, Tremel W. Au@MnO-“Nanoblumen” - Hybrid-Nanokomposite zur selektiven dualen Funktionalisierung und Bildgebung. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200906689] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Schladt TD, Schneider K, Shukoor MI, Natalio F, Bauer H, Tahir MN, Weber S, Schreiber LM, Schröder HC, Müller WEG, Tremel W. Highly soluble multifunctional MnO nanoparticles for simultaneous optical and MRI imaging and cancer treatment using photodynamic therapy. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm01465f] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Natalio F, Mugnaioli E, Wiens M, Wang X, Schröder HC, Tahir MN, Tremel W, Kolb U, Müller WEG. Silicatein-mediated incorporation of titanium into spicules from the demosponge Suberites domuncula. Cell Tissue Res 2009; 339:429-36. [DOI: 10.1007/s00441-009-0903-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2009] [Accepted: 10/27/2009] [Indexed: 10/20/2022]
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Plese B, Schröder HC, Grebenjuk VA, Wegener G, Brandt D, Natalio F, Müller WE. Strombine dehydrogenase in the demosponge Suberites domuncula: Characterization and kinetic properties of the enzyme crucial for anaerobic metabolism. Comp Biochem Physiol B Biochem Mol Biol 2009; 154:102-7. [DOI: 10.1016/j.cbpb.2009.05.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2008] [Revised: 05/05/2009] [Accepted: 05/11/2009] [Indexed: 11/24/2022]
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Wang XH, Schlossmacher U, Natalio F, Schröder HC, Wolf SE, Tremel W, Müller WEG. Evidence for biogenic processes during formation of ferromanganese crusts from the Pacific Ocean: implications of biologically induced mineralization. Micron 2009; 40:526-35. [PMID: 19443230 DOI: 10.1016/j.micron.2009.04.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2009] [Revised: 04/08/2009] [Accepted: 04/10/2009] [Indexed: 11/24/2022]
Abstract
Ferromanganese [Fe/Mn] crusts formed on basaltic seamounts, gain considerable economic importance due to their high content of Co, Ni, Cu, Zn and Pt. The deposits are predominantly found in the Pacific Ocean in depths of over 1000m. They are formed in the mixing layer between the upper oxygen-minimum zone and the lower oxygen-rich bottom zone. At present an almost exclusive abiogenic origin of crust formation is considered. We present evidence that the upper layers of the crusts from the Magellan Seamount cluster are very rich in coccoliths/coccolithophores (calcareous phytoplankton) belonging to different taxa. Rarely intact skeletons of these unicellular algae are found, while most of them are disintegrated into their composing prisms or crystals. Studies on the chemical composition of crust samples by high resolution SEM combined with an electron probe microanalyzer (EPMA) revealed that they are built of distinct stacked piles of individual compartments. In the center of such piles Mn is the dominant element, while the rims of the piles are rich in Fe (mineralization aspect). The compartments contain coccospheres usually at the basal part. Energy dispersive X-ray spectroscopy (EDX) analyses showed that those coccospheres contain, as expected, CaCO3 but also Mn-oxide. Detailed analysis displayed on the surface of the coccolithophores a high level of CaCO3 while the concentration of Mn-oxide is relatively small. With increasing distance from the coccolithophores the concentration of Mn-oxide increases on the expense of residual CaCO3. We conclude that coccoliths/coccolithophores are crucial for the seed/nucleation phase of crust formation (biomineralization aspect). Subsequently, after the biologically induced mineralization phase Mn-oxide deposition proceeds "auto"catalytically.
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Mugnaioli E, Natalio F, Schloßmacher U, Wang X, Müller WEG, Kolb U. Crystalline Nanorods as Possible Templates for the Synthesis of Amorphous Biosilica during Spicule Formation in Demospongiae. Chembiochem 2009; 10:683-9. [DOI: 10.1002/cbic.200800623] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Shukoor MI, Natalio F, Fischer S, Terekhov M, Schreiber W, Schröder HC, Müller WEG, Tremel W. Functionalized Magnetic Nano-particles for Selective Targeting and Sensing of Cells. Z Anorg Allg Chem 2008. [DOI: 10.1002/zaac.200870146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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