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https://www.readbyqxmd.com/read/28432998/non-ideal-effects-in-bending-response-of-soft-substrates-covered-with-biomimetic-scales
#1
Ranajay Ghosh, Hamid Ebrahimi, Ashkan Vaziri
Biomimetic scales are known to substantially alter the mechanics response of the underlying substrate engendering complex nonlinearities that can manifest even in small deformations due to scales interaction. This interaction is typically modeled using a-priori homogenization with an enforced periodicity of engagement. Such a framework is fairly useful especially when dealing with the structural length scale which is at least one order of magnitude greater than the scales themselves since individual tracking of a large number of scales become insurmountable...
April 15, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28432956/introduction-of-n-cadherin-binding-motif-to-alginate-hydrogels-for-controlled-stem-cell-differentiation
#2
Jae Won Lee, Hyoseok An, Kuen Yong Lee
Control of stem cell fate and phenotype using biomimetic synthetic extracellular matrices (ECMs) is an important tissue engineering approach. Many studies have focused on improving cell-matrix interactions. However, proper control of cell-cell interactions using synthetic ECMs could be critical for tissue engineering, especially with undifferentiated stem cells. In this study, alginate hydrogels were modified with a peptide derived from the low-density lipoprotein receptor-related protein 5 (LRP5), which is known to bind to N-cadherin, as a cell-cell interaction motif...
April 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28430676/a-biomimetic-alternative-to-synthetic-hydroxyapatite-boron-containing-bone-like-hydroxyapatite-precipitated-from-simulated-body-fluid
#3
Mert Calis, Tugrul Tolga Demirtas, Alper Vatansever, Gulseren Irmak, Ahmet Hamdi Sakarya, Pergin Atilla, Figen Ozgur, Menemse Gumusderelioglu
BACKGROUND: Biological hydroxyapatite (HA), has several mechanical and physical advantages over the commercially available synthetic apatite (CAP-HA). The aim of this in vivo study was to investigate the effect of osteoinductive "bone-like hydroxyapatite" obtained from simulated body fluid (SBF) combined with osteoinductive "boron" (B) on bone healing. MATERIALS: Bone like nanohydroxyapatite (SBF-HA) was precipitated from 10× simulated body fluid (10×SBF). Thirty Sprague-Dawley rats were randomly divided into 5 experimental groups (n = 6 each)...
April 20, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28430344/surfactant-assisted-synthesis-of-polyvinylpyrrolidone-hydroxyapatite-composites-as-a-bone-filler
#4
Masoumeh Meskinfam Langroudi, Masoud Giahi Saravani, Azita Nouri
BACKGROUND: Different methods have been used to prepare bone-like composites from inorganic nanoparticles embedded in polymeric matrixes to obtain the properties and structures required for bone fillers. METHODS: Bone-like nano-hydroxyapatite (nHA) was synthesized using a biomimetic method, with polyvinylpyrrolidone (PVP) as template and sodium dodecyl sulfate (SDS) as surfactant. RESULTS: The results demonstrated the formation of HA composites and showed that polymer and surfactant as the polymer capsule can be properly used to control the size, shape, morphology and dispersion of HA crystals...
April 11, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/28429753/impact-of-surface-active-guanidinium-tetramethylguanidinium-and-cholinium-based-ionic-liquids-on-vibrio-fischeri-cells-and-dipalmitoylphosphatidylcholine-liposomes
#5
Antti H Rantamäki, Suvi-Katriina Ruokonen, Evangelos Sklavounos, Lasse Kyllönen, Alistair W T King, Susanne K Wiedmer
We investigated the toxicological effect of seven novel cholinium, guanidinium, and tetramethylguanidinium carboxylate ionic liquids (ILs) from an ecotoxicological point of view. The emphasis was on the potential structure-toxicity dependency of these surface-active ILs in aqueous environment. The median effective concentrations (EC50) were defined for each IL using Vibrio (Aliivibrio) fischeri marine bacteria. Dipalmitoylphosphatidylcholine (DPPC) liposomes were used as biomimetic lipid membranes to study the interactions between the surface-active ILs and the liposomes...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28428038/non-invasive-tracking-of-hydrogel-degradation-using-upconversion-nanoparticles
#6
Yuqing Dong, Guorui Jin, Changchun Ji, Rongyan He, Min Lin, Xin Zhao, Ang Li, Tian Jian Lu, Feng Xu
Tracking the distribution and degradation of hydrogels in vivo is important for various applications including tissue engineering and drug delivery. Among various imaging modalities, fluorescence imaging has attracted intensive attention due to their high sensitivity, low cost and easy operation. Particularly, upconversion nanoparticles (UCNPs) that emit visible lights upon near-infrared (NIR) light excitation as tracking probes are promising in deciphering the fate of hydrogels after transplantation. Herein, we reported a facile and non-invasive in vivo hydrogel tracking method using UCNPs, where the degradation of hydrogels was determined using the decrease in fluorescence intensity from the UCNPs encapsulated in the hydrogels...
April 17, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28425712/synthesis-and-photooxidation-of-the-trisubstituted-oxazole-fragment-of-the-marine-natural-product-salarin-c
#7
Jan-Niklas Schäckermann, Thomas Lindel
The eastern section of the macrocyclic marine natural product salarin C from the sponge Fascaplysinopsis sp. was synthesized employing a halogen dance reaction to assemble the trisubstituted oxazole moiety. The synthesis was inspired by Kashman's hypothesis on the biomimetic oxidation of salarin C to salarin A. Clean conversion to the triacylamine partial structure of salarin A occurred on treatment with photochemically generated singlet oxygen. Thus, a Wasserman-type oxidative rearrangement is chemically possible in this case...
April 20, 2017: Organic Letters
https://www.readbyqxmd.com/read/28425283/total-synthesis-of-angiopterlactone-b
#8
Marie I Thomson, Gary S Nichol, Andrew L Lawrence
An enantioselective total synthesis of (-)-angiopterlactone B has been accomplished in four steps. The synthesis features a proposed biomimetic domino ring-contraction/oxa-Michael/Michael dimerization sequence, forming three new bonds, two new rings, and three new contiguous stereogenic centers in a single step. It has been determined that the originally proposed absolute configuration of natural (+)-angiopterlactone B needs revision. This reveals that angiopteroside, a known glycoside natural product, is the likely biosynthetic precursor to (+)-angiopterlactone B...
April 20, 2017: Organic Letters
https://www.readbyqxmd.com/read/28420794/structural-features-and-lipid-binding-domain-of-tubulin-on-biomimetic-mitochondrial-membranes
#9
David P Hoogerheide, Sergei Y Noskov, Daniel Jacobs, Lucie Bergdoll, Vitalii Silin, David L Worcester, Jeff Abramson, Hirsh Nanda, Tatiana K Rostovtseva, Sergey M Bezrukov
Dimeric tubulin, an abundant water-soluble cytosolic protein known primarily for its role in the cytoskeleton, is routinely found to be associated with mitochondrial outer membranes, although the structure and physiological role of mitochondria-bound tubulin are still unknown. There is also no consensus on whether tubulin is a peripheral membrane protein or is integrated into the outer mitochondrial membrane. Here the results of five independent techniques-surface plasmon resonance, electrochemical impedance spectroscopy, bilayer overtone analysis, neutron reflectometry, and molecular dynamics simulations-suggest that α-tubulin's amphipathic helix H10 is responsible for peripheral binding of dimeric tubulin to biomimetic "mitochondrial" membranes in a manner that differentiates between the two primary lipid headgroups found in mitochondrial membranes, phosphatidylethanolamine and phosphatidylcholine...
April 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28418231/a-dendritic-amphiphile-for-efficient-control-of-biomimetic-calcium-phosphate-mineralization
#10
Doreen Hentrich, Soraya Taabache, Gerald Brezesinski, Nele Lange, Wolfgang Unger, Christian Kübel, Annabelle Bertin, Andreas Taubert
The phase behavior of a dendritic amphiphile containing a Newkome-type dendron as the hydrophilic moiety and a cholesterol unit as the hydrophobic segment is investigated at the air-liquid interface. The amphiphile forms stable monomolecular films at the air-liquid interface on different subphases. Furthermore, the mineralization of calcium phosphate beneath the monolayer at different calcium and phosphate concentrations versus mineralization time shows that at low calcium and phosphate concentrations needles form, whereas flakes and spheres dominate at higher concentrations...
April 18, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28415549/the-precursors-effects-on-biomimetic-hydroxyapatite-ceramic-powders
#11
Afife Binnaz Hazar Yoruç, Aysu Aydınoğlu
In this study, effects of the starting material on chemical, physical, and biological properties of biomimetic hydroxyapatite ceramic powders (BHA) were investigated. Characterization and chemical analysis of BHA powders were performed by using XRD, FT-IR, and ICP-AES. Microstructural features such as size and morphology of the resulting BHA powders were characterized by using BET, nano particle sizer, pycnometer, and SEM. Additionally, biological properties of the BHA ceramic powders were also investigated by using water-soluble tetrazolium salts test (WST-1)...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415500/sustained-release-of-simvastatin-from-hollow-carbonated-hydroxyapatite-microspheres-prepared-by-aspartic-acid-and-sodium-dodecyl-sulfate
#12
Ke Wang, Yinjing Wang, Xu Zhao, Yi Li, Tao Yang, Xue Zhang, Xiaoguang Wu
Hollow carbonated hydroxyapatite (HCHAp) microspheres as simvastatin (SV) sustained-release vehicles were fabricated through a novel and simple one-step biomimetic strategy. Firstly, hollow CaCO3 microspheres were precipitated through the reaction of CaCl2 with Na2CO3 in the presence of aspartic acid and sodium dodecyl sulfate. Then, the as-prepared hollow CaCO3 microspheres were transformed into HCHAp microspheres with a controlled anion-exchange method. The HCHAp microspheres were 3-5μm with a shell thickness of 0...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415445/microstructural-and-surface-modifications-and-hydroxyapatite-coating-of-ti-6al-4v-triply-periodic-minimal-surface-lattices-fabricated-by-selective-laser-melting
#13
Chunze Yan, Liang Hao, Ahmed Hussein, Qingsong Wei, Yusheng Shi
Ti-6Al-4V Gyroid triply periodic minimal surface (TPMS) lattices were manufactured by selective laser melting (SLM). The as-built Ti-6Al-4V lattices exhibit an out-of-equilibrium microstructure with very fine α' martensitic laths. When subjected to the heat treatment of 1050°C for 4h followed by furnace cooling, the lattices show a homogenous and equilibrium lamellar α+β microstructure with less dislocation and crystallographic defects compared with the as-built α' martensite. The as-built lattices present very rough strut surfaces bonded with plenty of partially melted metal particles...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415427/surface-physical-chemistry-properties-in-coated-bacterial-cellulose-membranes-with-calcium-phosphate
#14
Gabriel Molina de Olyveira, Pierre Basmaji, Ligia Maria Manzine Costa, Márcio Luiz Dos Santos, Carla Dos Santos Riccardi, Fernando Pozzi Semeghini Guastaldi, Raquel Mantuaneli Scarel-Caminaga, Ticiana Sidorenko de Oliveira Capote, Elisabeth Pizoni, Antônio Carlos Guastaldi
Bacterial cellulose has become established as a new biomaterial, and it can be used for medical applications. In addition, it has called attention due to the increasing interest in tissue engineering materials for wound care. In this work, the bacterial cellulose fermentation process was modified by the addition of chondroitin sulfate to the culture medium before the inoculation of the bacteria. The biomimetic process with heterogeneous calcium phosphate precipitation of biological interest was studied for the guided regeneration purposes on bacterial cellulose...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415424/development-of-strong-biodegradable-and-highly-elastomeric-polycitrate-gelatin-hybrid-polymer-with-enhanced-cellular-biocompatibility
#15
Caiting Feng, Yuzhang Du, Yannan Li, Bo Lei
Native human tissues possess incomparable biological performance due to their strong and viscoelastic mechanical properties, and biocompatible compositions. Herein, by a thermal polymerization and solvent hybridization method, we develop biomimetic polycitrate-gelatin hybrid polymers (PC-GT) with strong mechanical properties and tailored elastomeric behavior for tissue regeneration applications. The incorporation of gelatin significantly enhanced the mechanical properties and cellular biocompatibility of PC...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415397/surface-modified-bioresorbable-electrospun-scaffolds-for-improving-hemocompatibility-of-vascular-grafts
#16
Pablo C Caracciolo, María Isabel Rial-Hermida, Florencia Montini-Ballarin, Gustavo A Abraham, Angel Concheiro, Carmen Alvarez-Lorenzo
The replacement of small-diameter vessels is one of the main challenges in tissue engineering. Moreover, the surface modification of small-diameter vascular grafts (SDVG) is a key factor in the success of the therapy due to their increased thrombogenicity and infection susceptibility caused by the lack of a functional endothelium. In this work, electrospun scaffolds were prepared from blends of poly(L-lactic acid) (PLLA) and segmented polyurethane (PHD) with a composition designed to perform as SDVG inner layer...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415260/enhanced-processing-in-arrays-of-optimally-tuned-nonlinear-biomimetic-sensors-a-coupling-mediated-ringelmann-effect-and-its-dynamical-mitigation
#17
Alexander P Nikitin, Adi R Bulsara, Nigel G Stocks
Inspired by recent results on self-tunability in the outer hair cells of the mammalian cochlea, we describe an array of magnetic sensors where each individual sensor can self-tune to an optimal operating regime. The self-tuning gives the array its "biomimetic" features. We show that the overall performance of the array can, as expected, be improved by increasing the number of sensors but, however, coupling between sensors reduces the overall performance even though the individual sensors in the system could see an improvement...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28414316/tuning-crystallization-pathways-through-sequence-engineering-of-biomimetic-polymers
#18
Xiang Ma, Shuai Zhang, Fang Jiao, Christina J Newcomb, Yuliang Zhang, Arushi Prakash, Zhihao Liao, Marcel D Baer, Christopher J Mundy, James Pfaendtner, Aleksandr Noy, Chun-Long Chen, James J De Yoreo
Two-step nucleation pathways in which disordered, amorphous, or dense liquid states precede the appearance of crystalline phases have been reported for a wide range of materials, but the dynamics of such pathways are poorly understood. Moreover, whether these pathways are general features of crystallizing systems or a consequence of system-specific structural details that select for direct versus two-step processes is unknown. Using atomic force microscopy to directly observe crystallization of sequence-defined polymers, we show that crystallization pathways are indeed sequence dependent...
April 17, 2017: Nature Materials
https://www.readbyqxmd.com/read/28412554/prompt-peripheral-nerve-regeneration-induced-by-a-hierarchically-aligned-fibrin-nanofiber-hydrogel
#19
Jinrong Du, Jianheng Liu, Shenglian Yao, Haiquan Mao, Jiang Peng, Xun Sun, Zheng Cao, Yongdong Yang, Bo Xiao, Yiguo Wang, Peifu Tang, Xiumei Wang
Fibrin plays a crucial role in peripheral nerve regeneration, which could occur spontaneously in the format of longitudinally oriented fibrin cables during the initial stage of nerve regeneration. This fibrin cable can direct migration and proliferation of Schwann cells and axonal regrowth, which is very important to nerve regeneration. In the present study, we prepared a three-dimensional hierarchically aligned fibrin nanofiber hydrogel (AFG) through electrospinning and molecular self-assembly to resemble the architecture and biological function of the native fibrin cable...
April 12, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28410875/particle-sorting-by-paramecium-cilia-arrays
#20
Richard Mayne, James G H Whiting, Gabrielle Wheway, Chris Melhuish, Andrew Adamatzky
Motile cilia are cell-surface organelles whose purposes, in ciliated protists and certain ciliated vertebrate epithelia, include generating fluid flow, sensing and substance uptake. Certain properties of cilia arrays, such as beating synchronisation and manipulation of external proximate particulate matter, are considered emergent, but remain incompletely characterised despite these phenomena having being the subject of extensive modelling. This study constitutes a laboratory experimental characterisation of one of the emergent properties of motile cilia: manipulation of adjacent particulates...
April 11, 2017: Bio Systems
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