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https://www.readbyqxmd.com/read/28334693/fabrication-of-human-hair-keratin-jellyfish-collagen-eggshell-derived-hydroxyapatite-osteoinductive-biocomposite-scaffolds-for-bone-tissue-engineering-from-waste-to-regenerative-medicine-products
#1
Yavuz Emre Arslan, Tugba Sezgin Arslan, Burak Derkus, Emel Emregul, Kaan C Emregul
In the present study, we aimed at fabricating an osteoinductive biocomposite scaffold using keratin obtained from human hair, jellyfish collagen and eggshell-derived nano-sized spherical hydroxyapatite (nHA) for bone tissue engineering applications. Keratin, collagen and nHA were characterized with the modified Lowry method, free-sulfhydryl groups and hydroxyproline content analysis, sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), attenuated total reflectance-fourier transform infrared spectroscopy (ATR-FTIR) and thermal gravimetric analysis (TGA) which confirmed the success of the extraction and/or isolation processes...
March 18, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28331956/enzyme-assisted-supercritical-fluid-extraction-an-alternative-and-green-technology-for-non-extractable-polyphenols
#2
Muhammad Mushtaq, Bushra Sultana, Sumia Akram, Farooq Anwar, Ahmad Adnan, Syed S H Rizvi
This contribution proposes an enzyme-assisted eco-friendly process for the extraction of non-extractable polyphenols (NEPPs) from black tea leftover (BTLO), an underutilized tea waste. BTLO hydrolyzed with various enzyme formulations was extracted using supercritical carbon dioxide and ethanol as co-solvent (SC-CO2 + EtOH). A conventional solvent extraction (CSE) was performed using EtOH + H2O (80:20, v/v) for comparison purposes. The results revealed that hydrolysis of BTLO with 2.9% (w/w) kemzyme at 45 °C and pH 5...
March 22, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28330236/xylanase-production-from-penicillium-citrinum-isolate-hzn13-using-response-surface-methodology-and-characterization-of-immobilized-xylanase-on-glutaraldehyde-activated-calcium-alginate-beads
#3
Zabin K Bagewadi, Sikandar I Mulla, Yogesh Shouche, Harichandra Z Ninnekar
The present study reports the production of high-level cellulase-free xylanase from Penicillium citrinum isolate HZN13. The variability in xylanase titers was assessed under both solid-state (SSF) and submerged (SmF) fermentation. SSF was initially optimized with different agro-waste residues, among them sweet sorghum bagasse was found to be the best substrate that favored maximum xylanase production (9643 U/g). Plackett-Burman and response surface methodology employing central composite design were used to optimize the process parameters for the production of xylanase under SSF...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330211/cellulase-production-using-natural-medium-and-its-application-on-enzymatic-hydrolysis-of-thermo-chemically-pretreated-biomass
#4
Shivani Sharma, Vinay Sharma, Arindam Kuila
Lignocellulosic bioethanol is an important renewable fuel for transportation purpose. Commercial production of lignocellulosic bioethanol mainly depends on cost of cellulase production, efficient pretreatment and enzymatic hydrolysis process. In the present study cellulase production from Aspergillus niger under submerged fermentation (SmF) was optimized using coconut water as natural medium. Maximum cellulase production (0.53 IU/mL) was achieved within 3 days of incubation using 8 % (w/v) waste paper and 0...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330194/exploited-application-of-sulfate-reducing-bacteria-for-concomitant-treatment-of-metallic-and-non-metallic-wastes-a-mini-review
#5
REVIEW
Ali Hussain, Ali Hasan, Arshad Javid, Javed Iqbal Qazi
A variety of multidimensional anthropogenic activities, especially of industrial level, are contaminating our aquatic and terrestrial environments with a variety of metallic and non-metallic pollutants. The metallic and non-metallic pollutants addressed specifically in this review are heavy metals and various compound forms of sulfates, respectively. Direct and indirect deleterious effects of the both types of pollutants to all forms of life are well-known. The treatment of such pollutants is therefore much necessary before their final discharge into the environment...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330166/a-molecular-phylogenetic-framework-for-bacillus-subtilis-using-genome-sequences-and-its-application-to-bacillus-subtilis-subspecies-stecoris-strain-d7xpn1-an-isolate-from-a-commercial-food-waste-degrading-bioreactor
#6
Joseph Adelskov, Bharat K C Patel
A thermophilic, heterotrophic and facultatively anaerobic bacterium designated strain D7XPN1 was isolated from Baku BakuKing™, a commercial food-waste degrading bioreactor (composter). The strain grew optimally at 45 °C (growth range between 24 and 50 °C) and pH 7 (growth pH range between pH 5 and 9) in Luria Broth supplemented with 0.3 % glucose. Strain D7XPN1 tolerated up to 7 % NaCl and showed amylolytic and xylanolytic activities. 16S rRNA gene analysis placed strain D7XPN1 in the cluster represented by Bacillus subtilis and the genome analysis of the 4...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28325348/hydrophobic-edible-films-made-up-of-tomato-cutin-and-pectin
#7
Anny Manrich, Francys K V Moreira, Caio G Otoni, Marcos V Lorevice, Maria A Martins, Luiz H C Mattoso
Cutin is the biopolyester that protects the extracellular layer of terrestrial plants against dehydration and environmental stresses. In this work, cutin was extracted from tomato processing waste and cast into edible films having pectin as a binding agent. The influences of cutin/pectin ratio (50/50 and 25/75), film-forming suspension pH, and casting method on phase dispersion, water resistance and affinity, and thermal and mechanical properties of films were investigated. Dynamic light scattering and scanning electron microscopy revealed that cutin phase aggregation was reduced by simply increasing pH...
May 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28318785/biodegradation-of-polyester-polyurethane-by-aspergillus-tubingensis
#8
Sehroon Khan, Sadia Nadir, Zia Ullah Shah, Aamer Ali Shah, Samantha C Karunarathna, Jianchu Xu, Afsar Khan, Shahzad Munir, Fariha Hasan
The xenobiotic nature and lack of degradability of polymeric materials has resulted in vast levels of environmental pollution and numerous health hazards. Different strategies have been developed and still more research is being in progress to reduce the impact of these polymeric materials. This work aimed to isolate and characterize polyester polyurethane (PU) degrading fungi from the soil of a general city waste disposal site in Islamabad, Pakistan. A novel PU degrading fungus was isolated from soil and identified as Aspergillus tubingensis on the basis of colony morphology, macro- and micro-morphology, molecular and phylogenetic analyses...
March 15, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28317729/chemical-components-and-emulsification-properties-of-mucilage-from-dioscorea-opposita-thunb
#9
Fanyi Ma, Yun Zhang, Yanna Yao, Yurong Wen, Weiping Hu, Jie Zhang, Xiuhua Liu, Alan E Bell, Carina Tikkanen-Kaukanen
The properties of mucilage obtained from Dioscorea opposita, generated during industrial manufacturing were investigated in this study. Characteristics such as monosaccharide content, amino acid content, molecular weight, and structural features were measured, whereas morphology was observed using a scanning/transmission electron microscope. Additionally, emulsification properties at different concentrations (0.2%, 0.4%, 0.6%, 0.8%, and 1.0%) and under acidic and basic pH (5.0 and 9.0) conditions were studied...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28301973/beneficial-reuse-of-brest-harbor-france-dredged-sediment-as-alternative-material-in-road-building-laboratory-investigations
#10
Walid Maherzi, Mahfoud Benzerzour, Yannick Mamindy-Pajany, Eleanor Van Veen, Mohamed Boutouil, Edine Abriak Nor
ABSRACT The scarcity of natural aggregates promotes waste reuse as secondary raw material in the field of civil engineering. This article focuses on the beneficial reuse of marine dredged sediments in road building. Thus, mixtures of raw sediments and dredged sand collected from Brest Harbour (Bretagne, France) were treated with road hydraulic binders. Formulation were prepared and characterized as recommended by the French Technical Guidelines for soil treatment with lime and/or hydraulic binders. Mechanical resistance results are quite similar for the both hydraulic binders suggesting a similar reactivity with the studied sediment sample...
March 17, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28301822/elevated-lead-levels-and-changes-in-blood-morphology-and-erythrocyte-cr1-in-preschool-children-from-an-e-waste-area
#11
Yifeng Dai, Xia Huo, Yu Zhang, Tian Yang, Minghui Li, Xijin Xu
Improper dismantling and combustion of electronic waste (e-waste) may release persistent organic pollutants and heavy metals that possess potential risk for human health. Lead (Pb) is carried through the circulatory system by erythrocytes and is known to alter the functions of hematopoietic and immune systems. The aim of the study was to investigate the effect of Pb exposure on blood morphology and erythrocyte complement receptor 1 (CR1) levels as related to immunologic function in preschool children. We recruited 484 preschool children, 2- to 6-years of age, among whom 332 children were from Guiyu, a typical and primitive e-waste processing area, and 152 children from Haojiang (reference area)...
March 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28297682/degradation-of-organic-pollutants-by-bio-inspired-rectangular-and-hexagonal-titanium-dioxide-nanostructures
#12
T V M Sreekanth, Jae-Jin Shim, Yong Rok Lee
Dyes are used in textile, printing, leather, pharmaceutical, food and cosmetic industries. Dyes add color and pattern to materials. The presence of even very low concentration of dyes/dyes degradation products in effluent is highly toxic to humans and aquatic organisms. It is important to remove these dye degradation pollutants from the industrial effluents before their disposal. In recent years nanoparticles have been used for the removal of dyes from industrial waste water. Titanium dioxide nanostructures (TiO2 NS) were synthesized via a one-step facile green process...
March 9, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28293216/comparative-genome-analysis-of-three-thiocyanate-oxidizing-thioalkalivibrio-species-isolated-from-soda-lakes
#13
Tom Berben, Lex Overmars, Dimitry Y Sorokin, Gerard Muyzer
Thiocyanate is a C1 compound containing carbon, nitrogen, and sulfur. It is a (by)product in a number of natural and industrial processes. Because thiocyanate is toxic to many organisms, including humans, its removal from industrial waste streams is an important problem. Although a number of bacteria can use thiocyanate as a nitrogen source, only a few can use it as an electron donor. There are two distinct pathways to use thiocyanate: (i) the "carbonyl sulfide pathway," which has been extensively studied, and (ii) the "cyanate pathway," whose key enzyme, thiocyanate dehydrogenase, was recently purified and studied...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28291333/metallic-state-fes-anchored-fe-fe3o4-n-doped-graphitic-carbon-with-porous-spongelike-structure-as-durable-catalysts-for-enhancing-bioelectricity-generation
#14
Xin Xu, Ying Dai, Jia Yu, Liang Hao, Yaqiang Duan, Ye Sun, Yanhong Zhang, Yuhui Lin, Jinlong Zou
The critical issues in practical application of microbial fuel cells (MFCs) for wastewater treatment are the high cost and poor activity and durability of precious metal catalysts. To alleviate the activity loss and kinetic barriers for oxygen reduction reaction (ORR) on cathode, (Fe)/Fe3O4/FeS/N-doped graphitic carbon ((Fe)/Fe3O4/FeS/NGC) is prepared as ORR catalyst through a one-step method using waste pomelo skins as carbon source. Various characterization techniques and electrochemical analyses are conducted to illustrate the correlation between structural characteristics and catalytic activity...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28290544/expression-and-characterization-of-pantoea-co-dehydrogenase-to-utilize-co-containing-industrial-waste-gas-for-expanding-the-versatility-of-co-dehydrogenase
#15
Eun Sil Choi, Kyoungseon Min, Geun-Joong Kim, Inchan Kwon, Yong Hwan Kim
Although aerobic CO dehydrogenases (CODHs) might be applicable in various fields, their practical applications have been hampered by low activity and no heterologous expression. We, for the first time, could functionally express recombinant PsCODH in E. coli and obtained a highly concentrated recombinant enzyme using an easy and convenient method. Its electron acceptor spectra, optimum conditions (pH 6.5 and 30 °C), and kinetic parameters (kcat of 12.97 s(-1), Km of 0.065 mM, and specific activity of 0...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28290084/briquettes-production-for-use-as-power-source-for-combustion-using-charcoal-thin-waste-and-sanitary-sewage-sludge
#16
Ricardo Sonsim de Oliveira, Soraya Moreno Palácio, Edson Antonio da Silva, Filipe Quadros Mariani, Thiago Olinek Reinehr
This study evaluated the feasibility of production of briquettes using fine charcoal, sewage sludge, and mixtures thereof for use in energy production. The briquettes of 7-8 cm diameter and 20 cm length were produced in the conical press extruder type, mixing sewage sludge to charcoal fines in different ratios: 0:100, 25:75, 50:50, 75:25, and 100:0, with the addition of a binder (glue flour) in a ratio of 8 mass% prepared for briquetting. After air drying (temperatures between 24 and 30°C) for 48 h, the mechanical, thermal, and morphological characterizations were performed...
March 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28285732/a-novel-approach-for-reducing-toxic-emissions-during-high-temperature-processing-of-electronic-waste
#17
R Saini, R Khanna, R K Dutta, R Cayumil, M Ikram-Ul-Haq, V Agarwala, G Ellamparuthy, K Jayasankar, P S Mukherjee, V Sahajwalla
A novel approach is presented to capture some of the potentially toxic elements (PTEs), other particulates and emissions during the heat treatment of e-waste using alumina adsorbents. Waste PCBs from mobile phones were mechanically crushed to sizes less than 1mm; their thermal degradation was investigated using thermo-gravimetric analysis. Observed weight loss was attributed to the degradation of polymers and the vaporization of organic constituents and volatile metals. The sample assembly containing PCB powder and adsorbent was heat treated at 600°C for times ranging between 10 and 30min with air, nitrogen and argon as carrier gases...
March 9, 2017: Waste Management
https://www.readbyqxmd.com/read/28284143/attitude-of-the-stakeholders-involved-in-the-repair-and-second-hand-sale-of-small-household-electrical-and-electronic-equipment-case-study-in-spain
#18
María D Bovea, Victoria Pérez-Belis, Pilar Quemades-Beltrán
The European legal framework for Electrical and Electronic Equipment (EEE) and Waste Electrical and Electronic Equipment (WEEE) (Directive 2012/19/EU) prioritises reuse strategies against other valorisation options. Along these lines, this paper examines the awareness and perceptions of reusing small household EEE from the viewpoint of the different stakeholders involved in its end-of-life: repair centres, second-hand shops and consumers. Direct interviews were conducted in which an intended survey, designed specifically for each stakeholder, was answered by a representative sample of each one...
March 8, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28284093/towards-engineering-application-potential-mechanism-for-enhancing-anaerobic-digestion-of-complex-organic-waste-with-different-types-of-conductive-materials
#19
Zhiqiang Zhao, Yang Li, Xie Quan, Yaobin Zhang
Conductive materials have been widely investigated to accelerate and stabilize the conversion of organic wastes to methane. However, the potential mechanisms involved with different types of conductive materials are still unclear. In this study, magnetite (Fe3O4) and granular activated carbon (GAC), as the two typical conductive materials, were respectively supplemented to acidogenesis and methanogenesis of a two-phase anaerobic digestion (AD) system in an attempt to explore their different mechanisms. The results showed that, magnetite supplemented to the acidogenic phase could enhance the decomposition of complex organics into simples, but significantly raise the hydrogen partial pressure as well as enrich the hydrogen-utilizing methanogens, which were not expected for aceticlastic methanogenesis known as a mainstream of methanogenesis in most of traditional digesters...
March 1, 2017: Water Research
https://www.readbyqxmd.com/read/28283978/enhanced-levofloxacin-removal-from-water-using-zirconium-iv-loaded-corn-bracts
#20
Ying Yu, Wei Wang, Jing Shi, Siyi Zhu, Yachen Yan
The presence of antibiotics in the environment has attracted considerable attention due to their toxicity. In this study, agricultural waste corn bracts (CBs) modified by zirconium cations were utilized to remove levofloxacin (LEV) from wastewater. Zr-modified CBs exhibited a strong adsorption capacity (Qmax = 73 mg/g), and their desorption rate could reach 89% by simply adjusting the pH to 11. FTIR and XPS analyses indicated that the mechanism of LEV adsorption included the complexation between the ketone/carboxyl groups of LEV and the Zr atoms and the π-π electron-donor-acceptor interaction...
March 11, 2017: Environmental Science and Pollution Research International
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