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Bio mat

Sadaf Saremi, Mats Isaksson, Karin C Harding
Radionuclides from the Chernobyl accident in 1986 still circulate in the Baltic marine ecosystem and activity levels in water, sediments and fish species such as herring and perch are monitored annually. However, the activity levels of radionuclides in marine mammals have only been sporadically reported. Tissue samples from a museum collection were analysed in two species of seals, and the trends over time in activity level of radioactive caesium (Cs-137) after the Chernobyl accident were reconstructed. We also performed a literature review summarizing activity levels in marine mammals world-wide...
August 1, 2018: Science of the Total Environment
Federica Valeriani, Silvia Crognale, Carmela Protano, Gianluca Gianfranceschi, Massimiliano Orsini, Matteo Vitali, Vincenzo Romano Spica
Several factors influence bacteria biodiversity in hot springs. The impact of biotic and abiotic pathways on travertine deposition plays a key role in microbial ecology and in the final composition of the waterborne microbiota. The metabolism of some bacterial groups such as photoautotrophs or lithoautotrophs influences water chemistry, favoring carbonate precipitation processes. The role of microbial mats in mineral precipitation processes is not fully clarified. For the first time, a comprehensive metagenomic analysis has been undertaken in the historical Bullicame hot spring...
March 2, 2018: New Microbiologica
Martin Humenik, Gregor Lang, Thomas Scheibel
Natural silk fibers represent one of the most advanced blueprints for (bio)polymer scientists, displaying highly optimized mechanical properties due to their hierarchical structures. Biotechnological production of silk proteins and implementation of advanced processing methods enabled harnessing the potential of these biopolymer not just based on the mechanical properties. In addition to fibers, diverse morphologies can be produced, such as nonwoven meshes, films, hydrogels, foams, capsules and particles. Among them, nanoscale fibrils and fibers are particularly interesting concerning medical and technical applications due to their biocompatibility, environmental and mechanical robustness as well as high surface-to-volume ratio...
February 2, 2018: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
Yilin Jiang, Zhifeng Liu, Guangming Zeng, Yujie Liu, Binbin Shao, Zhigang Li, Yang Liu, Wei Zhang, Qingyun He
Hexavalent chromium (Cr(VI)) is a common hazardous contaminant in the environment and carcinogenic or mutagenic to aquatic animals and human beings. Therefore, the removal and detoxification of Cr(VI) have been attracting increasing attention of researchers. Among various conducting polymers, polyaniline (PANI)-based adsorbents have shown an excellent performance on the removal of Cr(VI) because of their redox properties, eased synthesis, and favorable biocompatibility. In this review, the characteristics of various PANI-based adsorbents were described, including PANI-modified nanofiber mats and membranes, PANI/bio-adsorbents, PANI/magnetic adsorbents, PANI/carbon adsorbents, PANI-modified clay composites, and PANI-inorganic hybrid composites...
March 2018: Environmental Science and Pollution Research International
Samira Hosseini, Pedram Azari, Martín F Jiménez-Moreno, Aida Rodriguez-Garcia, Belinda Pingguan-Murphy, Marc J Madou, Sergio O Martínez-Chapa
In this article, a combination of far field electrospinning (FFES) and free-radical polymerization has been used to create a unique platform for protein immobilization via the physical attachment of biomolecules to the surface of the fiber mats. The large specific surface area of the fibers with its tailored chemistry provides a desirable platform for effective analyte-surface interaction. The detailed analysis of protein immobilization on a newly developed bio-receptive surface plays a vital role to gauge its advantages in bio-diagnostic applications...
October 9, 2017: Sensors
Shahrouz Zamani Khalajabadi, Aminudin Bin Haji Abu, Norhayati Ahmad, Muhammad Azizi Mat Yajid, Norizah Bt Hj Redzuan, Rozita Nasiri, Waseem Haider, Iman Noshadi
This study was aimed to improve of the corrosion resistance and mechanical properties of Mg/15TiO2/5HA nanocomposite by silicon and magnesium oxide coatings prepared using a powder metallurgy method. The phase evolution, chemical composition, microstructure and mechanical properties of uncoated and coated samples were characterized. Electrochemical and immersion tests used to investigate the in vitro corrosion behavior of the fabricated samples. The adhesion strength of ~36MPa for MgO and ~32MPa for Si/MgO coatings to substrate was measured by adhesion test...
September 27, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Hanna Karlsson, Serina Ahlgren, Mats Sandgren, Volkmar Passoth, Ola Wallberg, Per-Anders Hansson
BACKGROUND: Use of bio-based diesel is increasing in Europe. It is currently produced from oilseed crops, but can also be generated from lignocellulosic biomass such as straw. However, removing straw affects soil organic carbon (SOC), with potential consequences for the climate impact of the biofuel. This study assessed the climate impacts and energy balance of biodiesel production from straw using oleaginous yeast, with subsequent biogas production from the residues, with particular emphasis on SOC changes over time...
2017: Biotechnology for Biofuels
Brigitte Delord, Wilfrid Neri, Karen Bertaux, Alain Derre, Isabelle Ly, Nicolas Mano, Philippe Poulin
Novel carbon nanotube based electrodes of microbial fuel cells (MFC) have been developed. MFC is a promising technology for the wastewater treatment and the production of electrical energy from redox reactions of natural substrates. Performances of such bio-electrochemical systems depend critically on the structure and properties of the electrodes. The presently developed materials are made by weaving fibers solely comprised of carbon nanotubes. They exhibit a large scale porosity controlled by the weaving process...
November 2017: Bioresource Technology
Anell Olivos-Meza, Cristina Velasquillo Martínez, Brenda Olivos Díaz, Carlos Landa-Solís, Mats Brittberg, Raul Pichardo Bahena, Carmina Ortega Sanchez, Valentin Martínez, Enrique Alvarez Lara, José Clemente Ibarra-Ponce de León
To compare the quality of the repair tissue in three-dimensional co-culture of human chondrocytes implanted in an in vivo model. Six cadaveric and five live human donors were included. Osteochondral biopsies from the donor knees were harvested for chondrocyte isolation. Fifty percent of cadaveric chondrocytes were expanded until passage-2 (P2) while the remaining cells were cryopreserved in passage-0 (P0). Fresh primary chondrocytes (P0f) obtained from live human donors were co-cultured. Three-dimensional constructs were prepared with a monolayer of passage-2 chondrocytes, collagen membrane (Geistlich Bio-Gide® ), and pellet of non-co-cultured (P2) or co-cultured chondrocytes (P2 + P0c, P2 + P0f)...
September 2017: Cell and Tissue Banking
Ashraf A M M El-Rotail, Liang Zhang, Youran Li, Shuang Ping Liu, Gui Yang Shi
During the last few years, the global transcription machinery engineering (gTME) technique has gained more attention as an effective approach for the construction of novel mutants. Genetic strategies (molecular biology methods) were utilized to get mutational for both genes (SPT15 and TAF23) basically existed in the Saccharomyces cerevisiae genome via screening the gTME approach in order to obtain a new mutant S. cerevisiae diploid strain. The vector pYX212 was utilized to transform these genes into the control diploid strain S...
December 2017: AMB Express
Chetna Dhand, Mayandi Venkatesh, Veluchami Amutha Barathi, Sriram Harini, Samiran Bairagi, Eunice Goh Tze Leng, Nandhakumar Muruganandham, Kenny Zhi Wei Low, Mobashar Hussain Urf Turabe Fazil, Xian Jun Loh, Dinesh Kumar Srinivasan, Shou Ping Liu, Roger W Beuerman, Navin Kumar Verma, Seeram Ramakrishna, Rajamani Lakshminarayanan
There is a growing demand for durable advanced wound dressings for the management of persistent infections after deep burn injuries. Herein, we demonstrated the preparation of durable antimicrobial nanofiber mats, by taking advantage of strong interfacial interactions between polyhydroxy antibiotics (with varying number of OH groups) and gelatin and their in-situ crosslinking with polydopamine (pDA) using ammonium carbonate diffusion method. Polydopamine crosslinking did not interfere with the antimicrobial efficacy of the loaded antibiotics...
September 2017: Biomaterials
Raja Lope Adam, Hatta Sidi, Marhani Midin, Hazli Zakaria, Srijit Das, Khairi Che Mat
Sexuality is an important dimension in human beings as a form of expression of individuality. For many decades, sexual functioning has been a neglected area among patients suffering from schizophrenia. It was a presumption that patients with schizophrenia could be asexual and this could be secondary to overwhelming situations of delusion, hallucination, hostility and negative symptoms among others. The deficient in sexual functioning are due to innate factors, i.e. negative symptoms (apathy, avolition and amotivation) and also as a result of prefrontal dysfunction, i...
May 2, 2017: Current Drug Targets
Fereshteh Sharifi, Shiva Irani, Mojgan Zandi, Masoud Soleimani, Seyed Mohammad Atyabi
One of the determinant factors for successful bioengineering is to achieve appropriate nano-topography and three-dimensional substrate. In this research, polycaprolactone (PCL) nano-fibrous mat with different roughness modified with O2 plasma was fabricated via electrospinning. The purpose of this study was to evaluate the effect of plasma modification along with surface nano-topography of mats on the quality of human fibroblast (HDFs) and osteoblast cells (OSTs)-substrate interaction. Surface properties were studied using scanning electron microscopy (SEM), atomic force microscopy (AFM), contact angle, Fourier-transformation infrared spectroscopy...
December 2016: Progress in Biomaterials
Shangjing Xin, Zhaoyang Zeng, Xue Zhou, Wenjing Luo, Xiaowen Shi, Qun Wang, Hongbing Deng, Yumin Du
Biosorbents, such as algae and yeast, have been applied in heavy metal adsorption due to their low cost and efficacy. However, they cannot be recycled and reused after direct application, which may cause a secondary pollution. In this study, we used bio-electrospraying technique to immobilize Saccharomyces cerevisiae (a byproduct from food fermentation) onto the surface of poly(ε-caprolactone)/chitosan/rectorite ternary composites based nanofibrous mats. This technique not only combined the advantages of both S...
February 15, 2017: Journal of Hazardous Materials
V Gaget, A Keulen, M Lau, P Monis, J D Brookes
AIMS: Benthic Cyanobacteria produce toxic and odorous compounds similar to their planktonic counterparts, challenging the quality of drinking water supplies. The biofilm that benthic algae and other micro-organisms produce is a complex and protective matrix. Monitoring to determine the abundance and identification of Cyanobacteria, therefore, relies on molecular techniques, with the choice of DNA isolation technique critical. This study investigated which DNA extraction method is optimal for DNA recovery in order to guarantee the best DNA yield for PCR-based analysis of benthic Cyanobacteria...
January 2017: Journal of Applied Microbiology
Chetna Dhand, Seow Theng Ong, Neeraj Dwivedi, Silvia Marrero Diaz, Jayarama Reddy Venugopal, Balchandar Navaneethan, Mobashar H U T Fazil, Shouping Liu, Vera Seitz, Erich Wintermantel, Roger W Beuerman, Seeram Ramakrishna, Navin K Verma, Rajamani Lakshminarayanan
Bone disorders are the most common cause of severe long term pain and physical disability, and affect millions of people around the world. In the present study, we report bio-inspired preparation of bone-like composite structures by electrospinning of collagen containing catecholamines and Ca(2+). The presence of divalent cation induces simultaneous partial oxidative polymerization of catecholamines and crosslinking of collagen nanofibers, thus producing mats that are mechanically robust and confer photoluminescence properties...
October 2016: Biomaterials
Katarína Boriová, Martin Urík, Marek Bujdoš, Ivana Pifková, Peter Matúš
Presence of microorganisms in soils strongly affects mobility of metals. This fact is often excluded when mobile metal fraction in soil is studied using extraction procedures. Thus, the first objective of this paper was to evaluate strain Aspergillus niger's exometabolites contribution on aluminium mobilization. Fungal exudates collected in various time intervals during cultivation were analyzed and used for two-step bio-assisted extraction of alumina and gibbsite. Oxalic, citric and gluconic acids were identified in collected culture media with concentrations up to 68...
November 2016: Environmental Pollution
Daniel Grande, Julien Ramier, Davy Louis Versace, Estelle Renard, Valérie Langlois
Modification of electrospun nanofibrous poly(3-hydroxyalkanoate) (PHA)-based mats was implemented through two routes to obtain biomimetic scaffolds meant for tissue engineering applications. The first strategy relied on a physical functionalization of scaffolds thanks to an original route which combined both electrospinning and electrospraying, while the second approach implied the chemical modification of fiber surface via the introduction of reactive functional groups to further conjugate bioactive molecules...
July 25, 2017: New Biotechnology
Deborah Mascalzoni, Edward S Dove, Yaffa Rubinstein, Hugh Js Dawkins, Anna Kole, Pauline McCormack, Simon Woods, Olaf Riess, Franz Schaefer, Hanns Lochmüller, Bartha M Knoppers, Mats Hansson
No abstract text is available yet for this article.
July 2016: European Journal of Human Genetics: EJHG
Bishnu Kumar Shrestha, Hamouda M Mousa, Arjun Prasad Tiwari, Sung Won Ko, Chan Hee Park, Cheol Sang Kim
The development of biofunctional and bioactive hybrid polymeric scaffolds seek to mitigate the current challenges in the emerging field of tissue engineering. In this paper, we report the fabrication of a biomimetic and biocompatible nanofibrous scaffolds of polyamide-6,6 (PA-6,6) blended with biopolymer chitosan via one step co-electrospinning technique. Different weight percentage of chitosan 10wt%, 15wt%, and 20wt% were blended with PA-6,6, respectively. The nanocomposite electrospun scaffolds mats enabled to provide the osteophilic environment for cells growth and biomineralization...
September 5, 2016: Carbohydrate Polymers
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