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https://www.readbyqxmd.com/read/28645044/mussel-inspired-nano-multilayered-coating-on-magnesium-alloys-for-enhanced-corrosion-resistance-and-antibacterial-property
#1
Bi Wang, Liang Zhao, Weiwei Zhu, Liming Fang, Fuzeng Ren
Magnesium alloys are promising candidates for load-bearing orthopedic implants due to their biodegradability and mechanical resemblance to natural bone tissue. However, the high degradation rate and the risk of implant-associated infections pose grand challenges for their clinical applications. Herein, we developed a nano-multilayered coating strategy through polydopamine and chitosan assisted layer-by-layer assembly of osteoinductive carbonated apatite and antibacterial sliver nanoparticles on the surface of AZ31 magnesium alloys...
June 17, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28643920/analysis-of-polycaprolactone-scaffolds-fabricated-via-precision-extrusion-deposition-for-control-of-craniofacial-tissue-mineralization
#2
C W Fedore, L Y L Tse, H K Nam, K L Barton, N E Hatch
OBJECTIVES: Recurrence of cranial bone fusion following surgical resection in craniosynostosis patients commonly requires additional surgical procedures. Surgical implantation of engineered 3D scaffolds that control tissue mineralization could be utilized to diminish recurrence of fusion. This study investigated the ability of composite scaffolds to control tissue mineralization when cultured in vitro. SETTING AND SAMPLE POPULATION: Precision-engineered scaffolds with calvarial cells were cultured in vitro at the Department of Orthodontics and Pediatric Dentistry, University of Michigan...
June 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28641018/three-dimensional-imaging-of-transparent-tissues-via-metal-nanoparticle-labeling
#3
Abdullah Muhammad Syed, Shrey Sindhwani, Stefan Wilhelm, Benjamin R Kingston, Dennis S W Lee, Jennifer L Gommerman, Warren C W Chan
Chemical probes are key components of the bioimaging toolbox as they label biomolecules in cells and tissues. The new challenge in bioimaging is to design chemical probes for 3-Dimensional (3D) tissue imaging. Here, we discovered that the scattering of metal nanoparticles can provide imaging contrast in intact tissues in 3D. The nanoparticles can act as a template for chemically growing a metal layer to further enhance the scattering signal. The use of chemically-grown nanoparticles in whole tissues can amplify the scattering to produce a 1...
June 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28634611/micro-and-nano-patterned-conductive-graphene-peg-hybrid-scaffolds-for-cardiac-tissue-engineering
#4
Alec S T Smith, Hyok Yoo, Hyunjung Yi, Eun Hyun Ahn, Justin H Lee, Guozheng Shao, Ekaterina Nagornyak, Michael A Laflamme, Charles E Murry, Deok-Ho Kim
A lack of electrical conductivity and structural organization in currently available biomaterial scaffolds limits their utility for generating physiologically representative models of functional cardiac tissue. Here we report on the development of scalable, graphene-functionalized topographies with anisotropic electrical conductivity for engineering the structural and functional phenotypes of macroscopic cardiac tissue constructs. Guided by anisotropic electroconductive and topographic cues, the tissue constructs displayed structural property enhancement in myofibrils and sarcomeres, and exhibited significant increases in the expression of cell-cell coupling and calcium handling proteins, as well as in action potential duration and peak calcium release...
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28634139/ocular-disposition-of-ciprofloxacin-from-topical-pegylated-nanostructured-lipid-carriers-effect-of-molecular-weight-and-density-of-poly-ethylene-glycol
#5
Sai Prachetan Balguri, Goutham R Adelli, Karthik Yadav Janga, Prakash Bhagav, Soumyajit Majumdar
Ciprofloxacin (CIP) is an antibacterial agent prescribed for the treatment of ocular infections. The objective of the present project is to investigate the effect of surface PEG functionalization of the Nano structured lipid carriers (NLCs) on formulation stability, ocular penetration and distribution. CIP NLCs were tested with different molecular weight (poly ethylene glycol) PEGs ranging from (2K to 20K) grafted onto the phospholipid and with different chain lengths (14-18 carbons) of phospholipids derivatized with PEG-2K...
June 17, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28631375/3d-mimicry-of-native-tissue-fiber-architecture-guides-tendon-derived-cells-and-adipose-stem-cells-into-artificial-tendon-constructs
#6
Mariana Laranjeira, Rui M A Domingues, Raquel Costa-Almeida, Rui L Reis, Manuela E Gomes
Tendon and ligament (T/L) function is intrinsically related with their unique hierarchically and anisotropically organized extracellular matrix. Their natural healing capacity is, however, limited. Here, continuous and aligned electrospun nanofiber threads (CANT) based on synthetic/natural polymer blends mechanically reinforced with cellulose nanocrystals are produced to replicate the nanoscale collagen fibrils grouped into microscale collagen fibers that compose the native T/L. CANT are then incrementally assembled into 3D hierarchical scaffolds, resulting in woven constructions, which simultaneously mimic T/L nano-to-macro architecture, nanotopography, and nonlinear biomechanical behavior...
June 20, 2017: Small
https://www.readbyqxmd.com/read/28629081/optimized-composition-of-nanocomposite-scaffolds-formed-from-silk-fibroin-and-nano-tio2-for-bone-tissue-engineering
#7
N Johari, H R Madaah Hosseini, A Samadikuchaksaraei
Natural silk fibroin (SF) polymer has biomedical and mechanical properties as a biomaterial for bone tissue engineering scaffolds. Freeze-dried porous nanocomposite scaffolds were prepared from silk fibroin and titanium dioxide (TiO2) nanoparticles as a bioactive reinforcing agent by a phase separation method. In order to fabricate SF/TiO2 scaffolds, 5, 10, 15 and 20wt% of the TiO2 were added to the SF. The phase structure, functional groups and morphology of the scaffolds were evaluated using X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy techniques, respectively...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629074/tunable-green-graphene-silk-biomaterials-mechanism-of-protein-based-nanocomposites
#8
Fang Wang, S S Jyothirmayee Aravind, Hao Wu, Joseph Forys, Venkat Venkataraman, Kandalam Ramanujachary, Xiao Hu
Green graphene materials prepared by photoreduction of graphite oxide were first time blended with aqueous-based silk fibroin proteins to improve the mechanical and thermal properties of silk biomaterials, and their nanocomposite interaction mechanism was illustrated. Powder X-ray diffraction (XRD) analysis confirmed the complete exfoliation of graphite oxide to graphene in presence of focused pulses of solar radiation. By varying the concentration of graphene (0.1wt% to 10wt%), a series of free standing graphene-silk films were prepared and were systematically characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and nanoindentation measurements...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629069/evaluation-of-electrospun-biomimetic-substrate-surface-decorated-with-nanohydroxyapatite-precipitation-for-osteoblasts-behavior
#9
Sai Zhang, Guojun Jiang, Molamma P Prabhakaran, Xiaohong Qin, Seeram Ramakrishna
To engineer bone tissue, it is crucial to design scaffolds with micro- and nano-sized architecture imitating approximate hierarchical structure of native bone, and afford desirable biological properties by introducing biocompatible polymers and bioceramics into the scaffolds. Here, a novel scaffold consisting of poly-3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV)/polyaspartic acid (PAA) was fabricated by electrospinning and nano-hydroxyapatite (nHA) was deposited by calcium-phosphate dipping process for bone tissue regeneration...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28625671/intrinsic-parameters-for-the-synthesis-and-tuned-properties-of-amphiphilic-chitosan-drug-delivery-nanocarriers
#10
REVIEW
Marjan Motiei, Soheila Kashanian, Lucian A Lucia, Mozafar Khazaei
Chitosan (CS) is a material derived from chitin, the most abundant biopolymer on the planet. It has shown potential among a wide variety of biomedical applications especially within the context of self-assembling nanocarriers usable in biomedical applications such as drug delivery, macroscopic injectables, tissue-engineering scaffolds, and nano-imaging agents. To date, many reviews have been focused on the biomedical properties and applications of CS-based nanocarriers, but a review is lacking on the role and prospects of different factors such as formulation parameters and preparation conditions on the properties of amphiphilic chitosan nanocarriers (ACNs) that have shown critical value in advancing drug delivery...
June 15, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28622824/toxicological-assessment-of-nano-and-micron-sized-tungsten-oxide-after-28days-repeated-oral-administration-to-wistar-rats
#11
Srinivas Chinde, Paramjit Grover
Tungsten oxide (WO3) nanoparticles (NPs) are being used in various applications. However, the health consequences of WO3 NPs exposure have not been explored extensively. Hence, the goal of this study was to evaluate the toxicity of WO3 NPs and their microparticles (MPs) after 28days repeated oral administration in Wistar rats. The particles were characterised by transmission electron microscopy (TEM), dynamic light scattering (DLS), laser Doppler velocimetry (LDV), Brunner-Emmett-Teller (BET), X- ray diffraction (XRD), and inductively coupled plasma optical emission spectrometer (ICP-OES)...
July 2017: Mutation Research
https://www.readbyqxmd.com/read/28621456/absorption-distribution-and-excretion-of-four-forms-of-titanium-dioxide-pigment-in-the-rat
#12
Thomas P Farrell, Berna Magnuson
Titanium dioxide (TiO2 ) is a white color additive that has a long history of global approval and use in food. There is, however, considerable confusion regarding the applicability of the biological effects of novel, engineered, nano-sized forms of TiO2 developed for nonpigmentary applications to the safety of oral exposure to food grade TiO2 pigment. The objective of this study was to assess the absorption, distribution, and routes of excretion in rats after oral exposure to food grade TiO2 . Four different grades of TiO2 (200 ppm) or control (0 ppm) diets were fed to rats for 7 consecutive days, followed by control diet only for 1, 24, or 72 h...
June 16, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28620768/carbon-nanotube-reinforced-collagen-hydroxyapatite-scaffolds-improve-bone-tissue-formation-in-vitro-and-in-vivo
#13
Zheng Jing, Yeke Wu, Wen Su, Mi Tian, Wenlu Jiang, Li Cao, Lixing Zhao, Zhihe Zhao
Current bone regeneration strategies faced major challenges in fabricating the bionic scaffolds with nano-structure, constituents and mechanical features of native bone. In this study, we developed a new porous scaffold by adding the multi-walled carbon nanotube (MWCNT) into collagen (Col)/hydroxyapatite (HA) composites. Data showed that 0.5%CNT/Col/HA (0.5%CNT) group was approximately tenfolds stiffer than Col-HA, and it was superior in promoting bone marrow mesenchymal stem proliferation and spreading, mRNA and protein expressions of bone sialoprotein (BSP) and osteocalcin (OCN) than Col-HA group...
June 15, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28619003/hydroxyapatite-as-a-nanomaterial-for-advanced-tissue-engineering-and-drug-therapy
#14
Juha Tuukkanen, Miho Nakamura
Hydroxyapatite (HAp) is a complicated ceramic material that varies between the way it appears in biological systems and how it is synthesized as various calcium phosphates. HAp varies in chemical composition of substituting atoms, crystallinity, grain size and electrical polarization. HAp can form solid to macro-, micro- and nanoporous structures. Also, particulate HAp can have highly porous structure. HAp can be used as coatings for metal implants in thicknesses from hundreds of microns down to hundreds of nanometers...
June 15, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28616954/surface-charge-and-particle-size-determine-the-metabolic-fate-of-dendritic-polyglycerols
#15
Kritee Pant, Johanna Pufe, Kristof Zarschler, Ralf Bergmann, Jörg Steinbach, Sabine Reimann, Rainer Haag, Jens Pietzsch, Holger Stephan
Dendritic polyglycerols (dPG) are water soluble, polyether-based nanomaterials which hold great potential in diagnostic as well as therapeutic applications. In order to translate them for in vivo applications, a systematic assessment regarding their cell and tissue interactions as well as their metabolic fate in vivo is a crucial step. Herein, we explore the structure-activity relationship of three different sizes (ca. 3, 5, and 10 nm) of neutral dendritic polyglycerol (dPG) and their corresponding negatively charged sulfate analogs (dPGS) on their in vitro and in vivo characteristics...
June 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/28616703/preparation-of-a-biphase-composite-scaffold-and-its-application-in-tissue-engineering-for-femoral-osteochondral-defects-in-rabbits
#16
Shi-Qiang Ruan, Ling Yan, Jiang Deng, Wen-Liang Huang, Dian-Ming Jiang
PURPOSE: Three-dimensional bioactive scaffolds are useful tools for stem cell implant in tissue-engineering. For chondral and subchondral repair, the chondroinductive and osteoinductive property of a scaffold is a major challenge. The scaffolds that aim to osteogenic differentiation have been well studied. However, cartilage cells can hardly be induced for osteogenesis, and monophase scaffolds cannot ideally repair both cartilage and subchondral defects at the same time. METHODS: We developed a novel biphase composite scaffold and observe its application osteochondral defects...
June 14, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28610455/non-fourier-thermal-transport-induced-structural-hierarchy-and-damage-to-collagen-ultrastructure-subjected-to-laser-irradiation
#17
Nilamani Sahoo, Arunn Narasimhan, Purbarun Dhar, Sarit Kumar Das
Comprehending the mechanism of thermal transport through biological tissues is an important factor for optimal ablation of cancerous tissues and minimising collateral tissue damage. The present study reports detailed mapping of the rise in internal temperature within the tissue mimics due to NIR (1064 nm) laser irradiation, both for bare mimics and with gold nanostructures infused. Gold nanostructures such as mesoflowers and nano spheres have been synthesized and used as photothermal converters to enhance the temperature rise, resulting in achieving the desired degradation of malignant tissue in targeted region...
June 13, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28603705/comparing-the-efficacy-of-three-different-nano-scale-bone-substitutes-in-vivo-study
#18
Sayed Mohammad Razavi, Mansour Rismanchian, Nasim Jafari-Pozve, Saied Nosouhian
BACKGROUND: Synthetic biocompatible bone substitutions have been used widely for bone tissue regeneration as they are safe and effective. The aim of this animal study is to compare the effectiveness of three different biocompatible bone substitutes, including nano-hydroxyapatite (nano-HA) nano-bioglass (nano-BG) and forstrite scaffolds. MATERIALS AND METHODS: In this interventional and experimental study, four healthy dogs were anesthetized, and the first to fourth premolars were extracted in each quadrant...
2017: Advanced Biomedical Research
https://www.readbyqxmd.com/read/28600781/consequences-of-centrosome-dysfunction-during-brain-development
#19
Maddalena Nano, Renata Basto
Development requires cell proliferation, differentiation and spatial organization of daughter cells to occur in a highly controlled manner. The mode of cell division, the extent of proliferation and the spatial distribution of mitosis allow the formation of tissues of the right size and with the correct structural organization. All these aspects depend on cell cycle duration, correct chromosome segregation and spindle orientation. The centrosome, which is the main microtubule-organizing centre (MTOC) of animal cells, contributes to all these processes...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28600540/electric-field-assisted-3d-fibrous-bioceramic-based-scaffolds-for-bone-tissue-regeneration-fabrication-characterization-and-in-vitro-cellular-activities
#20
Minseong Kim, Hui-Suk Yun, Geun Hyung Kim
Nano/microfibrous structure can induce high cellular activities because of the topological similarity of the extracellular matrix, and thus, are widely used in various tissue regenerative materials. However, the fabrication of a bioceramic (high weight percent)-based 3D microfibrous structure is extremely difficult because of the low process-ability of bioceramics. In addition, three-dimensional (3D) microfibrous structure can induce more realistic cellular behavior when compared to that of 2D fibrous structure...
June 9, 2017: Scientific Reports
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