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Erika L Buckle, June S Lum, Adrienne Roehrich, Robert Edward Stote, Branden Vandermoon, Martin Dracinsky, Shaun F Filocamo, Gary P Drobny
: A biomimetic approach to the formation of titania (TiO2) nanostructures is desirable due to the mild conditions required in this form of production. We have identified a series of serine-lysine peptides as candidates for the biomimetic production of TiO¬2 nanostructures. We have assayed these peptides for TiO2-precipitating activity upon exposure to titanium bis(ammonium lactato) dihydroxide and have characterized the resulting co-precipitates using scanning electron microscopy. A subset of these assayed peptides efficiently facilitates the production of TiO2 nanospheres...
March 29, 2018: Journal of Physical Chemistry. B
Xinying Zhang, Meiyin Wang, Linlin Lin, Gao Xiao, Zhenping Tang, Xuefeng Zhu
Biomimetic mineralization has emerged as a novel tool for generating excellent supports for enzyme stabilization. In this work, protamine was used to induce titanium (IV) bis(ammonium lactato) dihydroxide (Ti-BALDH) into titania nanoparticles. This biomimetic titanification process was adopted for laccase immobilization. Laccase-biotitania biocatalyst was prepared and the effect of different parameters (buffer solution, titania precursor concentration, protamine concentration, and enzyme loading) on the encapsulation efficiency and recovery of laccase were evaluated...
March 19, 2018: Journal of Bioscience and Bioengineering
Erika L Buckle, Adrienne Roehrich, Branden Vandermoon, Gary P Drobny
A biomimetic, peptide-mediated approach to inorganic nanostructure formation is of great interest as an alternative to industrial production methods. To investigate the role of peptide structure on silica (SiO2) and titania (TiO2) morphologies, we use the R5 peptide domain derived from the silaffin protein to produce uniform SiO2 and TiO2 nanostructures from the precursor silicic acid and titanium bis(ammonium lactato)dihydroxide, respectively. The resulting biosilica and biotitania nanostructures are characterized using scanning electron microscopy...
September 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Francisco José Cereceda-Sánchez, Jesús Molina-Mula
Objective: to evaluate the usefulness of capnography for the detection of metabolic changes in spontaneous breathing patients, in the emergency and intensive care settings. Methods: in-depth and structured bibliographical search in the databases EBSCOhost, Virtual Health Library, PubMed, Cochrane Library, among others, identifying studies that assessed the relationship between capnography values and the variables involved in blood acid-base balance. Results: 19 studies were found, two were reviews and 17 were observational studies...
May 15, 2017: Revista Latino-americana de Enfermagem
Ivonne Villa Jiménez, María José Aguilar Cordero, Rafael Guisado Barrilao, José Naranjo Orellana, Laura Guerrero Almeida
No abstract text is available yet for this article.
March 25, 2016: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
Johan Gardères, Tarek A Elkhooly, Thorben Link, Julia S Markl, Werner E G Müller, Jochen Renkel, Michael Korzhev, Matthias Wiens
The fundamental mechanisms of biomineralization and their translation into innovative synthetic approaches have yielded promising perspectives for the fabrication of biomimetic and bioinspired organic-inorganic hybrid materials. In siliceous sponges, the enzyme silicatein catalyzes the polycondensation of molecular precursors to nano-structured SiO2 that is deposited on self-assembled filaments consisting of the two silicatein isoforms (silicatein-α and -β) and the scaffold protein silintaphin-1. Due to its broad substrate specificity silicatein is also able to convert in vitro various other precursors to non-biogenic materials (e...
September 2016: Bioprocess and Biosystems Engineering
R Calvo-Rodríguez, F J Montero-Pérez, A García-Olid, E Baena-Delgado, J M Gallardo-Valverde, J M Calderón de la Barca-Gázquez, L M Jiménez-Murillo
BACKGROUND: Intestinal obstruction is one of the most frequent surgical emergencies. Its diagnosis is essentially based on clinical history, physical exploration and image tests. The aim of this study was to analyze the diagnostic value of acute phase reactants in patients with benign versus malign intestinal obstruction. METHOD: Historical cohort study of 53 patients who underwent surgery because of intestinal obstruction and/or non-obstructive colorectal cancer...
April 29, 2016: Anales del Sistema Sanitario de Navarra
Ticiana Paes, Fernanda Martins Gazoni, Nathanael de Freitas Pinheiro Junior, Hélio Penna Guimarães, Renato Delascio Lopes, Valéria Pereira Lanzoni, Letícia Sandre Vendrame, Antônio Carlos Lopes
BACKGROUND AND OBJECTIVES: Hepatic infarction is characterized by parenchyma ischemic necrosis involving at least two acinis. It is extremely uncommon due to the arterial and portal venous blood supply. We report a case of a patient not know to have diabetes who developed massive areas of ischemic infarcts of the liver after episode of acutely diabetes decompensated. CASE REPORT: A 67 year-old hypertensive female who has been presenting, for the last 10 days, polydipsia, high urinary volume, visual and gait impairment, nausea and vomiting was admitted to the emergency room (ER)...
December 2007: Revista Brasileira de Terapia Intensiva
Xiaobo Wang, Yong Yan, Bo Hao, Ge Chen
In this paper, a Cu, N co-doped TiO2 nanosheet with increased visible light photocatalytic activity was successfully synthesized using a biomimetic layer-by-layer deposition process. The polymer, branched-polyethyleneimine (b-PEI) was used as an induction agent for the hydrolysis of titanium bis(ammonium lactato)-dihydroxide (Ti-BALDH) as well as for a nitrogen resource, and the graphene oxide (GO) was used as a two-dimensional nano-template. The positively charged b-PEI will bind to the negatively charged GO and titania...
October 7, 2014: Dalton Transactions: An International Journal of Inorganic Chemistry
Yong Yan, Dong Wang, Peter Schaaf
Si/N-doped TiO2 core/shell nanopillar arrays with a nanoporous structure are fabricated through a simple protein-mediated TiO2 deposition process. The Si nanopillar arrays are used as templates and alternatively immersed in aqueous solutions of catalytic molecules (protamine, PA) and the titania precursor (titanium(iv) bis(ammonium lactato)dihydroxide, Ti-BALDH) for the layer by layer mineralization of a PA/TiO2 coating. After a subsequent calcination, a N-doped TiO2 layer is formed, and its thickness could be controlled by varying the cycles of deposition...
June 14, 2014: Dalton Transactions: An International Journal of Inorganic Chemistry
Yvonne Lang, Francisco del Monte, Brian J Rodriguez, Peter Dockery, David P Finn, Abhay Pandit
Nature has inspired the design of complex hierarchical structures in the field of material science. Diatoms, unicellular algae with a hallmark intricate siliceous cell wall, have provided such a stimulus. Altering the chemistry of the diatom frustule has been explored to expand on the potential application of diatoms. The ability to modify the diatom in vivo opens the possibility to tailor the diatom to the end application. Herein, we report the chemical modification of the living diatom T. weissflogii using a titania precursor, titanium (IV) bis-(ammonium lactato)-dihydroxide (TiBALDH)...
2013: Scientific Reports
Bo Hao, Yong Yan, Xiaobo Wang, Ge Chen
We fabricated a sandwich-like branched-polyethyleneimine (b-PEI)/TiO2/Au/graphene oxide (GO) nanocomposite through a biomimetic layer-by-layer co-mineralization approach, and the polymer b-PEI was believed to act as both an inducing agent for the hydrolysis of titanium bis(ammonium lactato)-dihydroxide (Ti-BALDH) and a reducing agent for the reduction of HAuCl4 in the synthetic procedure. Upon organic pyrolysis in air at 500 °C, a TiO2/Au nanosheet was formed; and gold nanocrystals were observed uniformly dispersed on TiO2 nanosheet...
November 7, 2013: Nanoscale
Gulaim A Seisenbaeva, Geoffrey Daniel, Jean-Marie Nedelec, Vadim G Kessler
Formation of nanocrystalline and monodisperse TiO2 from a water soluble and stable precursor, ammonium oxo-lactato-titanate, (NH4)8Ti4O4(Lactate)8·4H2O, often referred to as TiBALDH or TALH, is demonstrated to be due to a coordination equilibrium. This compound, individual in the solid state, exists in solution in equilibrium with ammonium tris-lactato-titanate, (NH4)2Ti(Lactate)3 and uniform crystalline TiO2 nanoparticles (anatase) stabilized by surface-capping with lactate ligands. This equilibrium can be shifted towards nano-TiO2via application of a less polar solvent like methanol or ethanol, dilution of the solution, introduction of salts or raising the temperature, and reverted on addition of polar and strongly solvating media such as dimethyl sulfoxide, according to NMR...
April 21, 2013: Nanoscale
Noori Choi, Lihan Tan, Ji-ryang Jang, Yu Mi Um, Pil J Yoo, Woo-Seok Choe
Using cyclic constrained TiO(2) binding peptides STB1 (CHKKPSKSC), RSTB1 (CHRRPSRSC) and linear peptide LSTB1 (AHKKPSKSA), it was shown that while affinity of the peptide to TiO(2) is essential to enable TiO(2) biomineralization, other factors such as biomineralization kinetics and peptide local structure need to be considered to predict biomineralization efficacy. Cyclic and linear TiO(2) binding peptides show significantly different biomineralization activities. Cyclic STB1 and RSTB1 could induce TiO(2) precipitation in the presence of titanium(IV)-bis-ammonium-lactato-dihydroxide (TiBALDH) precursor in water or tris buffer at pH 8...
October 2012: Journal of Inorganic Biochemistry
Hong-Lin Zhu, Ling Jin
In the title compound, [Mg(C(3)H(4)O(3))(2)(H(2)O)(2)], the Mg(2+) cation is six-coordinated by four O atoms from two lactate anions and two aqua ligands, completing an MgO(6) distorted octa-hedral geometry. The complex mol-ecules are bridged by O-H⋯O hydrogen-bonding inter-actions into helical chains parallel to the a axis, which are linked by further O-H⋯O inter-actions, forming a three-dimensional supra-molecular architecture.
July 1, 2012: Acta Crystallographica. Section E, Structure Reports Online
Xiaoli Wang, Zhongyi Jiang, Jiafu Shi, Yanpeng Liang, Chunhong Zhang, Hong Wu
A novel layer-by-layer self-assembly approach enabled by metal-organic coordination was developed to prepare polymer-inorganic hybrid microcapsules. Alginate was first activated via N-ethyl-N'-(3-dimethylaminopropyl) carbodiimide (EDC) and N-hydroxy succinimide (NHS) coupling chemistry, and subsequently reacted with dopamine. Afterward, the dopamine modified alginate (Alg-DA) and titanium(IV) bis(ammonium lactato) dihydroxide (Ti(IV)) were alternatively deposited onto CaCO3 templates. The coordination reaction between the catechol groups of Alg-DA and the Ti(IV) allowed the alternative assembly to form a series of multilayers...
July 25, 2012: ACS Applied Materials & Interfaces
Joshua L Allen, Elie Paillard, Paul D Boyle, Wesley A Henderson
The title compound {systematic name: poly[[aqua-lithium]-μ-3,3,8,8-tetra-methyl-1,4,6,9-tetra-oxa-5λ(4)-borataspiro-[4.4]nonane-2,7-dione]}, [Li(C(8)H(12)BO(6))(H(2)O)](n) (LiBMLB), forms a 12-membered macrocycle, which lies across a crystallographic inversion center. The lithium cations are pseudo-tetra-hedrally coordinated by three methyl-lactate ligands and a water mol-ecule. The asymmetric units couple across crystallographic inversion centers, forming the 12-membered macrocycles. These macrocycles, in turn, cross-link through the Li(+) cations, forming an infinite polymeric structure in two dimensions parallel to (101)...
June 1, 2012: Acta Crystallographica. Section E, Structure Reports Online
Qin Lou, Pavan S Chinthamanipeta, Devon A Shipp
A simple and effective way for TiO(2) to be deposited on silicon or indium tin oxide (ITO) substrates has been achieved by using a poly(styrene-block-4-vinyl pyridine) (PS-b-P4VP) block copolymer template. In particular, a mechanism for the formation of TiO(2) within the P4VP phase was developed. Within this model, the TiO(2) deposition occurs by swelling of the protonated P4VP segments followed by transport of Ti precursor, probably protonated Ti(OH)(4) given the low pH conditions used, into the swollen P4VP followed by condensation into TiO(2) during the heating/plasma etch processes...
December 20, 2011: Langmuir: the ACS Journal of Surfaces and Colloids
Hong Soo Choi, TaeHoon Kim, Ji Hyuk Im, Chong Rae Park
Hyper-networked Li(4)Ti(5)O(12)/carbon hybrid nanofiber sheets that contain both a faradaically rechargeable battery-type component, namely Li(4)Ti(5)O(12), and a non-faradaically rechargeable supercapacitor-type component, namely N-enriched carbon, are prepared by electrospinning and their dual function as a negative electrode of lithium-ion batteries (LIBs) and a capacitor is tested for a new class of hybrid energy storage (denoted BatCap). An aqueous solution composed of polyvinylpyrrolidone, lithium hydroxide, titanium(IV) bis(ammonium-lactato)dihydroxide and ammonium persulfate is electrospun to obtain hyper-networked nanofiber sheets...
October 7, 2011: Nanotechnology
Jia Jia Wei, Na Zhang, Yu Ling Wang, Qing Yan Liu
The asymmetric unit of the title compound, [InNa(C(3)H(5)O(3))(4)](n), consists of one In(III) ion, one Na(I) ion and four crystallographically independent L-lactate monoanions. The coordination of the In(III) ion is composed of five carboxylate O and two hydroxy O atoms in a distorted pentagonal-bipyramidal coordination geometry. The Na(I) ion is six-coordinated by four carboxylate O atoms and two hydroxy O atoms from four L-lactate ligands in a distorted octahedral geometry. Each In(III) ion is coordinated by four surrounding L-lactate ligands to form an [In(L-lactate)(4)](-) unit, which is further linked by Na(I) ions through Na-O bonds to give a two-dimensional layered structure...
May 2011: Acta Crystallographica. Section C, Crystal Structure Communications
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