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William M L Neethling, Kirsten Puls, Alethea Rea
OBJECTIVES: Durability of bioscaffolds cross-linked with glutaraldehyde and used in cardiovascular surgery is limited by biomechanical instability, calcification and reduced biocompatibility. This study compares CardioCel®, a bovine pericardial scaffold engineered via the ADAPT® process to ensure optimized biostability and biocompatibility, with the commonly used bioscaffolds. METHODS: Bovine pericardial scaffolds, cross-linked with 0.6% glutaraldehyde (XenoLogiX™, PeriGuard®), dye-mediated photo-oxidized (PhotoFix™) and a non-crosslinked porcine scaffold (CorMatrix®), were compared with CardioCel (decellularized, cross-linked with 0...
January 18, 2018: Interactive Cardiovascular and Thoracic Surgery
Xiangwen Feng, Huan Chen, Fang Jiang, Xin Wang
Oxygen and sulfur co-doped semicrystalline graphitic carbon nitride (HGCNOS) was synthesized by a one-pot hydrothermal method and applied in visible-light photocatalytic nitrogen fixation. Remarkably, HGCNOS exhibited a higher photocatalytic activity than pristine graphitic carbon nitride (GCN). Oxygen doping caused semicrystalline structure, making exciton dissociated at the order-disorder interfaces of HGCNOS and releasing more electrons and holes. Furthermore, the conduction band position of HGCNOS was elevated by sulfur doping, promoting the reduction ability of HGCNOS...
September 8, 2017: Journal of Colloid and Interface Science
Lu Li, Yichen Wang, Srinivas Vanka, Xiaoyue Mu, Zetian Mi, Chao-Jun Li
In many heterogeneous catalysts, the interaction of supported metal species with a matrix can alter the electronic and morphological properties of the metal and manipulate its catalytic properties. III-nitride semiconductors have a unique ability to stabilize ultra-small ruthenium (Ru) clusters (ca. 0.8 nm) at a high loading density up to 5 wt %. n-Type III-nitride nanowires decorated with Ru sub-nanoclusters offer controlled surface charge properties and exhibit superior UV- and visible-light photocatalytic activity for ammonia synthesis at ambient temperature...
June 9, 2017: Angewandte Chemie
Christopher W Baird, Patrick O Myers, Breanna Piekarski, Michele Borisuk, Amara Majeed, Sitaram M Emani, Stephen P Sanders, Meena Nathan, Pedro J Del Nido
Objectives: Dye-mediated photo-oxidation of pericardium is an alternative method to chemical treatment with glutaraldehyde for cross-linking collagen, providing biostability of the patch material while avoiding late calcification and cytotoxicity. There are few data available, on using photo-oxidation-treated pericardium, in congenital cardiac surgery. This study reports the outcomes using Photofix™ bovine pericardium in neonates, infants, children and young adults undergoing paediatric cardiac surgery...
February 1, 2017: Interactive Cardiovascular and Thoracic Surgery
Wee-Jun Ong, Lling-Lling Tan, Yun Hau Ng, Siek-Ting Yong, Siang-Piao Chai
As a fascinating conjugated polymer, graphitic carbon nitride (g-C3N4) has become a new research hotspot and drawn broad interdisciplinary attention as a metal-free and visible-light-responsive photocatalyst in the arena of solar energy conversion and environmental remediation. This is due to its appealing electronic band structure, high physicochemical stability, and "earth-abundant" nature. This critical review summarizes a panorama of the latest progress related to the design and construction of pristine g-C3N4 and g-C3N4-based nanocomposites, including (1) nanoarchitecture design of bare g-C3N4, such as hard and soft templating approaches, supramolecular preorganization assembly, exfoliation, and template-free synthesis routes, (2) functionalization of g-C3N4 at an atomic level (elemental doping) and molecular level (copolymerization), and (3) modification of g-C3N4 with well-matched energy levels of another semiconductor or a metal as a cocatalyst to form heterojunction nanostructures...
June 22, 2016: Chemical Reviews
O I Alexandrova, Y I Khorolskaya, D Y Maychuk, M I Blinova, O I Alexandrova, Y I Khorolskaya, D Y Maychuk, M I Blinova
UNLABELLED: The aim of the study was to identify the overall cytotoxicity of aminoglycosides netilmicin and tobramycin, and fluoroquinolone ciprofloxacin. MATERIAL AND METHODS: We used three types of the cells: constantly transformed cell line CHO-K1, normal human skin fibroblasts and cells of normal human conjunctiva Clone 1-5C-4. Antibiotics activity was detected by their influence on cell viability. Quantitative and qualitative methods of evaluation have used to determine viability of the cells (quantitative assessment: a method of cloning cells and colorimetric method for assessing cell proliferation; qualitative assessment: lifetime visual observation under an inverted microscope for morphological status of cells in culture with photofixing)...
September 2015: Vestnik Oftalmologii
Qian Zhang, Shaozheng Hu, Zhiping Fan, Daosheng Liu, Yanfeng Zhao, Hongfei Ma, Fayun Li
Nitrogen fixation is the second most important chemical process in nature, next to photosynthesis. Herein, we report a novel g-C3N4/ZnMoCdS heterojunction photocatalyst with outstanding nitrogen photofixation ability under visible light prepared by hydrothermal post-treatment. The as-prepared ZnMoCdS is the ternary metal sulfide Zn(0.12)Mo(0.12)Cd(0.9)S(1.14) with many sulfur vacancies, not a mixture of ZnS, MoS2 and CdS. Strong electronic coupling, as evidenced by the UV-Vis, XPS and EIS results, exists between two components in g-C3N4/ZnMoCdS heterojunction photocatalysts, leading to more effective separation of photogenerated electron-hole pairs and faster interfacial charge transfer...
February 28, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Amara Majeed, Christopher Baird, Michele J Borisuk, Stephen P Sanders, Robert F Padera
Pericardium is used as a tissue substitute during pediatric heart surgery. However, little is known about the histological characteristics of pericardial tissue substitutes. We searched our clinical and Pathology databases to identify cases in which glutaraldehyde-preserved autologous pericardium, PhotoFix bovine pericardium, or Peri-Guard Repair Patch glutaraldehyde-preserved bovine pericardium was used as patch material during cardiac surgery and in which explanted tissue substitute was available for histologic examination...
September 2016: Pediatric and Developmental Pathology
Francesco Itri, Daria M Monti, Bartolomeo Della Ventura, Roberto Vinciguerra, Marco Chino, Felice Gesuele, Angelina Lombardi, Raffaele Velotta, Carlo Altucci, Leila Birolo, Renata Piccoli, Angela Arciello
A hallmark to decipher bioprocesses is to characterize protein-protein interactions in living cells. To do this, the development of innovative methodologies, which do not alter proteins and their natural environment, is particularly needed. Here, we report a method (LUCK, Laser UV Cross-linKing) to in vivo cross-link proteins by UV-laser irradiation of living cells. Upon irradiation of HeLa cells under controlled conditions, cross-linked products of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) were detected, whose yield was found to be a linear function of the total irradiation energy...
February 2016: Cellular and Molecular Life Sciences: CMLS
Wenguang Tu, Yong Zhou, Shichao Feng, Qinfeng Xu, Peng Li, Xiaoyong Wang, Min Xiao, Zhigang Zou
Here we report multilayer hollow spheres consisting of alternating ultrathin Ti0.91O2 nanosheets and CdS nanoparticles via exquisite layer-by-layer self-assembly to achieve an all solid-state Z-scheme system with 7-times enhancement of the CH4-production rate relative to pure Ti0.91O2 hollow spheres, due to a greatly prolonged lifetime of charge carriers.
September 7, 2015: Chemical Communications: Chem Comm
Weirong Zhao, Haiping Xi, Meng Zhang, Yajun Li, Jinsheng Chen, Jing Zhang, Xi Zhu
NH3 is a potential hydrogen energy carrier. Here we use alcohols as hole scavengers to investigate the nitrogen photofixation mechanisms including direct and indirect electron transfer processes. The t-butanol system exhibited the highest quantum yield of 36.1%, ascribing to the in situ-formed indirect electronic transmitter ˙CO2(-).
March 21, 2015: Chemical Communications: Chem Comm
Tomoya Oshikiri, Kosei Ueno, Hiroaki Misawa
We have successfully developed a plasmon-induced technique for ammonia synthesis that responds to visible light through a strontium titanate (SrTiO3) photoelectrode loaded with gold (Au) nanoparticles. The photoelectrochemical reaction cell was divided into two chambers to separate the oxidized (anodic side) and reduced (cathodic side) products. To promote NH3 formation, a chemical bias was applied by regulating the pH value of these compartments, and ethanol was added to the anodic chamber as a sacrificial donor...
September 8, 2014: Angewandte Chemie
Zhenzhen Lin, Xinchen Wang
To allow for simultaneous textural engineering and doping of carbon nitride materials with heteroatoms, urea has been polymerized with an ionic liquid. The role of urea is to create a delamination effect during carbon nitride synthesis, whereas ionic liquid functions as texture modifier as well as B/F dopant source. This will result in the rational fabrication of boron- and fluorine-containing 2D carbon nitride nanosheets with enhanced optical harvesting and charge separation capabilities for hydrogen evolution catalysis using visible light...
June 2014: ChemSusChem
Rui Liu, Carolynn Stephani, Jae Jin Han, Kian L Tan, Dunwei Wang
No abstract text is available yet for this article.
April 8, 2013: Angewandte Chemie
Brian J Adzima, Christopher J Kloxin, Cole A DeForest, Kristi S Anseth, Christopher N Bowman
3D structures are written and developed in a crosslinked polymer initially formed by a Diels-Alder reaction. Unlike conventional liquid resists, small features cannot sediment, as the reversible crosslinks function as a support, and the modulus of the material is in the MPa range at room temperature. The support structure, however, can be easily removed by heating the material, and depolymerizing the polymer into a mixture of low-viscosity monomers. Complex shapes are written into the polymer network using two-photon techniques to spatially control the photoinitiation and subsequent thiol-ene reaction to selectively convert the Diels-Alder adducts into irreversible crosslinks...
December 21, 2012: Macromolecular Rapid Communications
Rui Liu, Guangbi Yuan, Candice L Joe, Thomas E Lightburn, Kian L Tan, Dunwei Wang
Photofixation of CO(2) to produce synthetically valuable molecules is achieved on a photoelectrode based on silicon nanowires. In their Communication (DOI: 10.1002/anie.201202569) K. L. Tan, D. Wang et al. develop a strategy that uses aromatic ketones to receive the photogenerated electrons. The resulting radicals then react with carbon dioxide to afford α-hydroxy acids, which are precursors for the drugs ibuprofen and naproxen. In close resemblance to natural photosynthesis, this strategy gains reaction specificity by avoiding the direct reduction of CO(2) ...
June 13, 2012: Angewandte Chemie
Z Topalian, G A Niklasson, C G Granqvist, L Österlund
Photoinduced SO(2) fixation on anatase TiO(2) films was studied by in situ Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). The TiO(2) films were prepared by reactive DC magnetron sputtering and were subsequently exposed to 50 ppm SO(2) gas mixed in synthetic air and irradiated with UV light at substrate temperatures between 298 and 673 K. Simultaneous UV irradiation and SO(2) exposure between 373 and 523 K resulted in significant sulfur (S) deposits on crystalline TiO(2) films as determined by XPS, whereas amorphous films contained negligible amounts of S...
February 2012: ACS Applied Materials & Interfaces
Patrick O Myers, Cécile Tissot, Jan T Christenson, Mustafa Cikirikcioglu, Yacine Aggoun, Afksendiyos Kalangos
OBJECTIVE: Aortic valve repair has encouraging midterm results in selected patients. However, neither the long-term results of cusp extension nor the durability of different pericardial fixation techniques has been reported. Our goal was to address these issues. METHODS: Seventy-eight children with severe rheumatic aortic regurgitation (mean age 12 ± 3.5 years) underwent aortic valve repair using cusp extension over a 15-year period, with fresh autologous pericardium in 53 (67...
October 2010: Journal of Thoracic and Cardiovascular Surgery
Oksana Linnik, Horst Kisch
The photofixation of dinitrogen to ammonia at a nanostructured iron titanate thin film, prepared from iron(III) chloride and titanium tetraisopropylate, was established by isotopic labeling employing (15,15)N(2). It is found that traces of iron chloride in the film are required to observe significant amounts of ammonia. It is therefore proposed that the photogenerated hole oxidizes chloride to an adsorbed chlorine atom and the latter subsequently oxidizes ethanol, the reducing agent necessary for ammonia formation...
October 2006: Photochemical & Photobiological Sciences
G N Schrauzer, N Strampach, L N Hui, M R Palmer, J Salehi
Sands from various geographic locations reduce N(2) from the air to NH(3) and traces of N(2)H(4) on exposure to sunlight. This N(2) photofixation occurs under sterile conditions on the surface of finely dispersed titanium minerals such as rutile, utilizing reducing equivalents generated through the photolysis of chemisorbed H(2)O. Abiological N(2) photofixation is suggested to be part of the nitrogen cycle in arid and semiarid regions. It is estimated that about 10 x 10(5) tons of N(2) is photoreduced on the total surface of the earth's deserts per year...
June 1983: Proceedings of the National Academy of Sciences of the United States of America
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