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Nonionic Triblock and Star Diblock Copolymer and Oligomeric Surfactant Syntheses of Highly Ordered, Hydrothermally Stable, Mesoporous Silica Structures
A family of highly ordered mesoporous (20−300 A) silica structures have been synthesized by the use of commercially available nonionic alkyl poly(ethylene oxide) (PEO) oligomeric surfactants and…
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Silicatein filaments and subunits from a marine sponge direct the polymerization of silica and silicones in vitro.
TLDR
It is shown that the protein filaments and their constituent subunits comprising the axial cores ofsilica spicules in a marine sponge chemically and spatially direct the polymerization of silica and silicone polymer networks from the corresponding alkoxide substrates in vitro, under conditions in which such syntheses otherwise require either an acid or base catalyst.
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Methane Leaks from North American Natural Gas Systems
TLDR
Methane emissions from U.S. and Canadian natural gas systems appear larger than official estimates, and global atmospheric CH4 concentrations are on the rise, with the causes still poorly understood.
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Silicatein α: Cathepsin L-like protein in sponge biosilica
TLDR
Structural features of the cDNA sequence of silicatein α, the most abundant of these subunits, reveals that this protein is highly similar to members of the cathepsin L and papain family of proteases, suggesting the possibility of a dynamic role of the silicateins in silicification of the sponge spicule.
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Molecular mechanistic origin of the toughness of natural adhesives, fibres and composites
Natural materials are renowned for their strength and toughness,,,,. Spider dragline silk has a breakage energy per unit weight two orders of magnitude greater than high tensile steel,, and is…
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Sacrificial bonds and hidden length dissipate energy as mineralized fibrils separate during bone fracture
TLDR
Evidence is found that bone consists of mineralized collagen fibrils and a non-fibrillar organic matrix, which acts as a ‘glue’ that holds the mineralized fibril together, and it is believed that this glue may resist the separation of mineralization of bone composite.
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Silicatein alpha: cathepsin L-like protein in sponge biosilica.
TLDR
The cDNA sequence of silicatein alpha, the most abundant of these subunits, reveals that this protein is highly similar to members of the cathepsin L and papain family of proteases, suggesting the possibility of a dynamic role of the silicateins in silicification of the sponge spicule and the prospect of a new synthetic route to silica and siloxane polymers at low temperature and pressure and neutral pH.
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Molecular Cloning and Characterization of Lustrin A, a Matrix Protein from Shell and Pearl Nacre of Haliotis rufescens *
TLDR
The cDNA coding for Lustrin A, a newly described matrix protein from the nacreous layer of the shell and pearl produced by the abalone, Haliotis rufescens, a marine gastropod mollusc, is cloned and characterized.
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General Predictive Syntheses of Cubic, Hexagonal, and Lamellar Silica and Titania Mesostructured Thin Films§
Well-ordered mesostructured silica and titania films were prepared using poly(ethylene oxide)−poly(propylene oxide)−poly(ethylene oxide) triblock copolymer species (Pluronic P123) as the…
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Control of crystal phase switching and orientation by soluble mollusc-shell proteins
IN the initial stages of the biomineralization of abalone shells, a primer layer of oriented calcite crystals grows on a nucleating protein sheet1,2. The deposition of this primer is followed by an…
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