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Yuzhang Du, Juan Ge, Yannan Li, Peter X Ma, Bo Lei
Artificial muscle-like biomaterials have gained tremendous interests owing to their broad applications in regenerative medicine, wearable devices, bioelectronics and artificial intelligence. Unfortunately, key challenges are still existed for current materials, including biomimetic viscoelasticity, biocompatibility and biodegradation, multifunctionality. Herein, for the first time, we develop highly elastomeric, conductive and biodegradable poly (citric acid-octanediol-polyethylene glycol)(PCE)-graphene (PCEG) nanocomposites, and demonstrate their applications in myogenic differentiation and guiding skeletal muscle tissue regeneration...
December 6, 2017: Biomaterials
Denise M Kenna, Busayo Irojah, Kimber Lee Mudge, Kendra Eveler
BACKGROUND: Breast reconstruction with tissue expander is the most common mode of reconstruction following mastectomy. Infection necessitating tissue expander removal is a significant complication leading to patient distress as well as increased health care costs. METHODS: Over 3 years, 127 breast reconstructions with tissue expanders were performed by a single surgeon. Fifty-nine of these reconstructions were performed using a standardized protocol in which patients washed with chlorhexidine several days prior to surgery and received intravenous antibiotics preoperatively...
December 13, 2017: Plastic and Reconstructive Surgery
Mehdi Ahmadi, Farshid Ghanbari
Several efforts have been carried out to present an efficient method for PMS activation. This work presented the use of UVC-LEDs (light emitting diodes) and US (ultrasound) to activate PMS for decolorization of Direct Orange 26 (DO26). The performance of UVC-LEDs/US/PMS process was effective in a broad range of pH (3.0-9.0). Complete decolorization was obtained in only 12 min in pH = 7.0 and 1.5 mM PMS. Bicarbonate and nitrite ions showed inhibitory effect on decolorization while sulfate, chloride, and nitrate had no significant effect on the performance of the process...
December 13, 2017: Environmental Science and Pollution Research International
Lei Ren, Zhong Lin, Hongming Liu, Hanqiao Hu
Phthalic acid esters (PAEs) have long been known as the most widely used plasticizer with a broad range of industrial application. PAEs are ubiquitous in different environments and our daily life due to their large and widespread application. Recent PAEs research mainly focused on their environmental fate (including leaching, migration, transformation) and toxicology and risk assessment. With the comprehensive recognition of their potential hazard, the elimination of PAEs has attracted worldwide concerns. Although many factors may contribute to the degradation of PAEs, the dominant role of biodegradation was widely reported...
December 14, 2017: Applied Microbiology and Biotechnology
Mohsen Sadani, Mohammad Amin Karami, Fahimeh Teimouri, Mohammad Mehdi Amin, Seyed Mahdi Moosavi, Bahare Dehdashti
Background: Cleanup of areas contaminated by explosives is a public health concern. Some explosives can be carcinogenic in humans. Pentaerythritol Tetranitrate (PETN), a powerful explosive with very low water solubility, can be easily transported to ground waters. Objective: This study was conducted to determine the removal efficiencies of PETN from soil by bioremediation, and obtain kinetic parameters of biological process. Methods: This experimental study was conducted at the Environmental Health Engineering Lab (Isfahan University of Medical Sciences, Isfahan, Iran) in 2015-2016...
October 2017: Electronic Physician
Yuri Litti, Anna Nikitina, Dmitriy Kovalev, Artem Ermoshin, Rishi Mahajan, Gunjan Goel, Alla Nozhevnikova
Treatment of sewage sludge (SS) by biodegradable polyacrylamide-based flocculants (PAM) is considered to be an effective way to increase total solids (TS) content prior to anaerobic digestion (AD). However, data on how PAM addition influences the efficiency of AD process are quite contradictory; moreover no data is available for thermophilic AD (TAD). This study showed that at optimal inoculum to substrate ratio (ISR, 55/45), PAM addition resulted in some decrease in initial methane production during TAD of SS due to formation of large flocs (up to 2-3 mm in diameter) which deteriorated the mass transfer...
December 14, 2017: Environmental Technology
Tingting Zhou, Jiagen Li, Xu Jia, Xubo Zhao, Peng Liu
Novel biocompatible and biodegradable pH/reduction dual-responsive oxidized alginate-doxorubicin (mPEG-OAL-DOX/Cys) prodrug nanohydrogels were designed for tumor-specific intracellular triggered release of anticancer drug DOX, by conjugating DOX via acid-labile Schiff base linkage into the PEGylated oxidized alginate (mPEG-OAL) crosslinked with bioreducible disulfide bond. The effect of the complexation with cyclodextrins (α-CD and -CD) before or after the crosslinking of the mPEG-OAL on the DOX content and controlled release performance was investigated...
December 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Talita Girio Carnaval, Flávia Gonçalves, Marcelo Munhóes Romano, Luiz Henrique Catalani, Marcia Alves Pinto Mayer, Victor Elias Arana-Chávez, Alexander Cassandri Nishida, Thais Claudino Lage, Carlos Eduardo Francci, Carlos Alberto Adde
The development of a biodegradable material with antimicrobial properties for local applications is required in the prevention and treatment of infectious diseases. The objective of this study was to produce blends of poly-L-lactide acid (PLLA) synthetic polymer associated with several antimicrobials, as an alternative in the prevention and treatment of infections, as well as to evaluate its cytotoxicity, release of antimicrobials and inhibit bacteria growth. Blends of PLLA added with 20% Amoxicillin, Metronidazole, Clindamycin or Azithromicyn were used to produce Films (F) or Meshs (M) by casting and electrospinning methods, respectively...
December 7, 2017: Brazilian Oral Research
Itza Mendoza-Sanchez, Robin L Autenrieth, Thomas J McDonald, Jeffrey A Cunningham
We applied a mathematical model to data from experimental column studies to understand the dynamics of successful and unsuccessful reductive dechlorination of chlorinated ethenes in groundwater under different flow conditions. In laboratory column experiments (reported previously), it was observed that complete dechlorination of cis-dichloroethene to ethene was sustained at high flow velocity (0.51 m/d), but that dechlorination failed at medium or low flow velocity (0.080 or 0.036 m/d). The mathematical model applied here accounts for transport of chlorinated ethenes in flowing groundwater, mass transfer of chlorinated ethenes between mobile groundwater and stationary biofilms, and diffusion and biodegradation within the biofilms...
December 13, 2017: Environmental Science & Technology
Yinqi Tang, Meng Li, Danning Xu, Jianjun Huang, Jingmei Sun
Aerobic denitrifiers coupled with a denitrification agent were applied in the sediment of an urban river for the bioremediation of nitrogen pollution. The results revealed that 14.7% of the total nitrogen in the sediment was removed after 115 days of treatment and the nitrate nitrogen concentration removal rate was enhanced in the overlying water. Compared with the control, the total transferable nitrogen in the sediment increased from 0.097 to 0.166 mg/g, indicating that more nitrogen is likely to be involved in the biogeochemical cycling of nitrogen...
December 13, 2017: Environmental Science and Pollution Research International
M E Prévôt, H Andro, S L M Alexander, S Ustunel, C Zhu, Z Nikolov, S T Rafferty, M T Brannum, B Kinsel, L T J Korley, E J Freeman, J A McDonough, R J Clements, E Hegmann
Tissue regeneration requires 3-dimensional (3D) smart materials as scaffolds to promote transport of nutrients. To mimic mechanical properties of extracellular matrices, biocompatible polymers have been widely studied and a diverse range of 3D scaffolds have been produced. We propose the use of responsive polymeric materials to create dynamic substrates for cell culture, which goes beyond designing only a physical static 3D scaffold. Here, we demonstrated that lactone- and lactide-based star block-copolymers (SBCs), where a liquid crystal (LC) moiety has been attached as a side-group, can be crosslinked to obtain Liquid Crystal Elastomers (LCEs) with a porous architecture using a salt-leaching method to promote cell infiltration...
December 13, 2017: Soft Matter
Jiachang Huang, Xulin Jiang
Injectable hydrogels have attracted increasing attentions in tissue regeneration and local drug delivery applications. Current click reactions for preparing injectable hydrogel often require a photoinitiator or catalyst, which may be toxic and may involve complex synthesis of precursors. Here we report a facile and inexpensive method to prepare injectable and degradable hydrogels via spontaneous amino-yne click reaction without using any initiator or catalyst under physiological conditions based on telechelic electron-deficient dipropiolate ester of polyethylene glycol and water-soluble commercially available carboxymethyl chitosan...
December 13, 2017: ACS Applied Materials & Interfaces
Chien-Hsin Ko, Ming-You Shie, Jia-Horng Lin, Yi-Wen Chen, Chun-Hsu Yao, Yueh-Sheng Chen
In our previous study, we found that gelatin-based materials exhibit good conductivity and are non-cytotoxic. In this study, gelatin was cross-linked with bisvinyl sulfonemethyl (BVSM) to fabricate a biodegradable conduit for peripheral nerve repair. First, BVSM on the prepared conduit was characterized to determine its mechanical properties and contact angle. The maximum tensile strength and water contact angle of the gelatin-BVSM conduits were 23 ± 4.8 MPa and 74.7 ± 9°, which provided sufficient mechanical strength to resist muscular contraction; additionally, the surface was hydrophilic...
December 13, 2017: Scientific Reports
Ivana Brzonova, Evguenii I Kozliak, Anastasia A Andrianova, Audrey LaVallie, Alena Kubátová, Yun Ji
Unlike previous lignin biodegradation studies, white rot fungi were used to produce functional biopolymers from Kraft lignin. Lignin-based polymers (hydrogel precursors) partially soluble in both aqueous and organic solvents were produced employing a relatively fast (6 days) enzymation of Kraft lignin with basidiomycetes, primarily Coriolus versicolor, pre-grown on kenaf/lignin agar followed by either vacuum evaporation or acid precipitation. After drying followed by a treatment with alkaline water, this intermediate polymer became a pH-sensitive anionic hydrogel insoluble in either aqueous or organic solvents...
December 13, 2017: Scientific Reports
Stefanie Riedel, Benedikt Heyart, Katharina S Apel, Stefan G Mayr
Biomimetic materials with programmable stimuli responsiveness constitute a highly attractive material class for building bioactuators, sensors and active control elements in future biomedical applications. With this background, we demonstrate how energetic electron beams can be utilized to construct tailored stimuli responsive actuators for biomedical applications. Composed of collagen-derived gelatin, they reveal a mechanical response to hydration and changes in pH-value and ion concentration, while maintaining their excellent biocompatibility and biodegradability...
December 12, 2017: Scientific Reports
Waleed S Mohammed, Elvira E Ziganshina, Elena I Shagimardanova, Natalia E Gogoleva, Ayrat M Ziganshin
OBJECTIVES: Paenibacillus species, belonging to the family Paenibacillaceae, are able to survive for long periods under adverse environmental conditions. Several Paenibacillus species produce antimicrobial compounds and are capable of biodegradation of various contaminants; therefore, more investigations at the genomic level are necessary to improve our understanding of their ecology, genetics, as well as potential biotechnological applications. DATA DESCRIPTION: In the present study, we describe the draft genome sequence of Paenibacillus sp...
December 12, 2017: BMC Research Notes
Matthias Raberg, Elena Volodina, Kaichien Lin, Alexander Steinbüchel
Ralstonia eutropha strain H16 is a Gram-negative non-pathogenic betaproteobacterium ubiquitously found in soils and has been the subject of intensive research for more than 50 years. Due to its remarkable metabolically versatility, it utilizes a broad range of renewable heterotrophic resources. The substrate utilization range can be further extended by metabolic engineering as genetic tools are available. It has become the best studied "Knallgas" bacterium capable of chemolithoautotrophic growth with hydrogen as the electron donor and carbon dioxide as the carbon source...
December 12, 2017: Critical Reviews in Biotechnology
Navnita Srivastva, Abhishek Singh, Yashpal Bhardwaj, Suresh Kumar Dubey
Isoprene, the ubiquitous, highly emitted non-methane volatile hydrocarbon, affects atmospheric chemistry and human health, and this makes its removal from the contaminated environment imperative. Physicochemical degradation of isoprene is inefficient and generates secondary pollutants. Therefore, biodegradation can be considered as the safer approach for its efficient abatement. This review summarizes efforts in this regard that led to tracking the diverse groups of isoprene degrading bacteria such as Methanotrophs, Xanthobacter, Nocardia, Alcaligenes, Rhodococcus, Actinobacteria, Alphaproteobacteria, Bacteriodetes, Pseudomonas, and Alcanivorax...
December 12, 2017: Critical Reviews in Biotechnology
Satish Jaiswal, R Manoj Kumar, Pallavi Gupta, Murali Kumaraswamy, Partha Roy, Debrupa Lahiri
Development of biodegradable implants has grown into one of the important areas in medical science. Degradability becomes more important for orthopaedic accessories used to support fractured and damaged bones, in order to avoid second surgery for their removal after healing. Clinically available biodegradable orthopaedic materials are mainly made of polymers or ceramics. These orthopaedic accessories have an unsatisfactory mechanical strength, when used in load-bearing parts. Magnesium and its alloys can be suitable candidate for this purpose, due to their outstanding strength to weight ratio, biodegradability, non-toxicity and mechanical properties, similar to natural bone...
November 21, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Minghui Yang, Bingdang Wu, Qiuhao Li, Xiaofeng Xiong, Haoran Zhang, Yu Tian, Jiawen Xie, Ping Huang, Suo Tan, Guodong Wang, Li Zhang, Shujuan Zhang
Biodegradability and toxicity are two important indexes in considering the feasibility of a chemical process for environmental remediation. The acetylacetone (AA) mediated photochemical process has been proven as an efficient approach for dye decolorization. Both AA and its photochemical degradation products had a high bioavailability. However, the biocompatibility and ecotoxicology of the UV/AA treated solutions are unclear yet. In the present work, we evaluated the biocompatibility and toxicity of the UV/AA treated solutions at both biochemical and organismal levels...
December 1, 2017: Chemosphere
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