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Photosynthetic biomineralization of radioactive Sr via microalgal CO<sub>2</sub> absorption
Lee, S.Y.,Jung, K.H.,Lee, J.E.,Lee, K.A.,Lee, S.H.,Lee, J.Y.,Lee, J.K.,Jeong, J.T.,Lee, S.Y. Elsevier Applied Science 2014 Bioresource technology Vol.172 No.-
Water-soluble radiostrontium (<SUP>90</SUP>Sr) was efficiently removed as a carbonate form through microalgal photosynthetic process. The immobilization of soluble <SUP>90</SUP>Sr radionuclide and production of highly-precipitable radio-strontianite (<SUP>90</SUP>SrCO<SUB>3</SUB>) biomineral are achieved by using Chlorella vulgaris, and the biologically induced mineralization drastically decreased the <SUP>90</SUP>Sr radioactivity in water to make the highest <SUP>90</SUP>Sr removal ever reported. The high-resolution microscopy revealed that the short-term removal of soluble <SUP>90</SUP>Sr by C. vulgaris was attributable to the rapid and selective carbonation of <SUP>90</SUP>Sr together with the consumption of dissolved CO<SUB>2</SUB> during photosynthesis. A small amount of carbonate in water could act as Sr<SUP>2+</SUP> sinks through the particular ability of the microalga to make the carbonate mineral of Sr stabilized firmly at the surface site.
양병선(Byeongseon Yang),윤진영(Jin Young Yun),차형준(Hyung Joon Cha) 한국해양바이오학회 2018 한국해양바이오학회지 Vol.10 No.2
Silicon has become of increasing importance as the basic element of many high-technology products. Its synthesis is very difficult requiring high temperature solid-state reactions (>100 0℃) or lower temperature methods (100-200℃) involving hydrothermal and solvothermal reactions under extreme pH conditions. In nature, on the other hand, a wide range of living organisms have collectively evolved the means of biosilicification at the astounding rate of gigatons/year. This is impressive because biosilicification in these organisms occurs under mild physiological conditions. Marine sponges possess the ability to sequester soluble silicon sources from their environments and assemble them into intricate 3D architecture. The advent of molecular biology has recently made it possible to glean molecular information about biosilicification from these systems and it turned out that enzyme silicatein is the core of biosilicification. In this review, biosilicification regulated by silicatein and its mechanism are described. Also, production of silicatein through recombinant technology and several applications of recombinant silicatein are described including immobilization of silicatein, formation of Au or Ag nanoparticles on nanowires, nanolithography approaches, core-shell materials, encapsulation, bone replacement materials, and microstructured optical fibers.
Bioprecipitation of calcium carbonate mediated by ureolysis: A review
Armstrong I. Omoregie,Enzo A. Palombo,Peter M. Nissom 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Ureolysis-driven microbially induced carbonate precipitation (MICP) is a naturally occurring process facilitated through microbial activities and biogeochemical reactions to produce calcium carbonate (CaCO₃) mineral. MICP serves as an alternative ground improvement binder method to conventional technologies which is sustainable, requires low energy for its treatment process, results in a minimal carbon footprint and could offer economic benefits. In the last two decades, MICP has drawn great interest from the scientific community because of its practicality to stabilize granular soils, repair concrete cracks and remediate heavy metals. To obtain successful MICP application, it is vital to understand the conditions that favor its process. This paper, therefore, provides an overview of literature on CaCO₃ precipitation mediated by ureolysis-driven MICP and its mechanism. The review includes a discussion on sources of urease enzyme from microorganisms used to induce CaCO₃ crystal formation required for implementation of MCIP for ground improvement. Moreover, the key factors that influence the outcome of MICP and bio-engineering testing methods typically used to evaluate MICP performance are also highlighted. Finally, this review also provides insight on the current drawbacks (i.e. ammonium production, scale-up bioprocess and treatment cost) affecting MICP technology and recommendations for future consideration.
Bioprecipitation of Calcium Carbonate Mediated by Ureolysis: A review
Armstrong I. Omoregie,Enzo A. Palombo,Peter M. Nissom 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Ureolysis-driven microbially induced carbonate precipitation (MICP) is a naturally occurring process facilitated through microbial activities and biogeochemical reactions to produce calcium carbonate (CaCO3) mineral. MICP serves as an alternative ground improvement binder method to conventional technologies which is sustainable, requires low energy for its treatment process, results in a minimal carbon footprint and could offer economic benefits. In the last two decades, MICP has drawn great interest from the scientific community because of its practicality to stabilize granular soils, repair concrete cracks and remediate heavy metals. To obtain successful MICP application, it is vital to understand the conditions that favor its process. This paper, therefore, provides an overview of literature on CaCO3 precipitation mediated by ureolysis-driven MICP and its mechanism. The review includes a discussion on sources of urease enzyme from microorganisms used to induce CaCO3 crystal formation required for implementation of MCIP for ground improvement. Moreover, the key factors that influence the outcome of MICP and bio-engineering testing methods typically used to evaluate MICP performance are also highlighted. Finally, this review also provides insight on the current drawbacks (i.e. ammonium production, scale-up bioprocess and treatment cost) affecting MICP technology and recommendations for future consideration.
Kim, Jung Kyu,Jang, Ji-ryang,Salman, Muhammad Saad,Tan, Lihan,Nam, Chang-Hoon,Yoo, Pil J.,Choe, Woo-Seok Elsevier 2019 Ceramics international Vol.45 No.5
<P><B>Abstract</B></P> <P>Biomineralization is a promising material synthesis strategy for environmentally benign production of nanostructured metal oxides. An important question is whether biomineralization can be used in the biomimetic synthesis of TiO<SUB>2</SUB> with tunable photocatalytic properties that are conducive to diverse solar energy conversion applications. Here, we report the biomineralization of energy-state-modified TiO<SUB>2</SUB> nanoparticles, where the critical properties closely related to their photocatalytic activity can be manipulated by tailoring the nature of the designer biotemplates. For this purpose, STB1 heptapeptide was employed as a nucleation center to induce TiO<SUB>2</SUB> biomineralization. Three distinctive types of biomolecules (peptide, protein, and phage) were deliberately designed to contain the STB1 nucleation core at different local densities and intermolecular distances. The degree of substitutional nitrogen-doping and the morphology are all subject to the context-dependent differential availability of STB1 in the biomineralization milieu. Phage-induced biomineralization results in TiO<SUB>2</SUB> with modified energy state and wire-like network morphology, which account for significantly enhanced charge dissociation/transport performance and high photocatalytic activity. This is the first study to report that a specific peptide with biomineralizing activity exerts differential impacts on the properties of resulting biomineralization products in a context-dependent manner, and will provide a powerful new strategy for tailoring of material properties via biomineralization.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Biomimetic synthesis of TiO<SUB>2</SUB> with tunable photochemical properties. </LI> <LI> Deliberately designed peptide, protein, and phage to contain the STB1 nucleation core. </LI> <LI> Synchronized control of size, morphology, and substitutional nitrogen-doping. </LI> <LI> Modification of the energy states for efficient photocatalytic activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
광물 합성 공정의 관점에서 본 생광물화과정 및 생체모방공학
이승우,장영남,박승빈 한국패류학회 2010 The Korean Journal of Malacology Vol.26 No.1
Biological organisms produce organic-inorganic nanocomposite composites that are hierarchically organized in composition and microstructure, containing both inorganic and organic components in complicated mixtures. The process related to the generation and regeneration of organic-inorganic complex in nature is called biomineralization process. Understanding how the process operates in a biological environment is a valuable guide to the synthesis of novel advanced material and developing important industrial processes. Like the mechanism of organisms, mollusks were also synthesized from interaction between organic matrices and minerals and their morphology was designed through biomineralization. In this study, shell formation has been studied as a bio-model and the application of biomimetics based on biomineralization is focused.