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Journal of Biotechnology

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https://www.readbyqxmd.com/read/29037808/application-of-titration-methods-for-measuring-the-contents-of-ammonium-nitrogen-and-volatile-fatty-acids-in-agricultural-biogas-plants
#1
Michał Piątek, Aleksander Lisowski, Barbara Lisowska
The aim of our research was to assess a relatively new method of estimating ammonium nitrogen concentration in anaerobic digestion of plant substrates. We analysed our own data, received from the anaerobic digestion of maize silage (PM), as well as data published by Purser et al. (2014) who measured energy crops and slurry (ECS), and food waste (FW). In our study, the process was monitored for VFA content that was determined by gas chromatography, and for the content of ammonium nitrogen determined using the HACH LANGE LCK 303 cuvette test...
October 13, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/29029999/dna-guided-assembly-of-a-five-component-enzyme-cascade-for-enhanced-conversion-of-cellulose-to-gluconic-acid-and-h2o2
#2
Qi Chen, Sooyoun Yu, Nosang Myung, Wilfred Chen
Enzymatic fuel cells have received considerable attention because of their potential for direct conversion of abundant raw materials such as cellulose to electricity. The use of multi-enzyme cascades is particularly attractive as they offer the possibility of achieving a series of complex reactions at higher efficiencies. Here we reported the use of a DNA-guided approach to assemble a five-component enzyme cascade for direct conversion of cellulose to gluconic acid and H2O2. Site-specific co-localization of β-glucosidase and glucose oxidase resulted in over 11-fold improvement in H2O2 production from cellobiose, highlighting the benefit of substrate channeling...
October 10, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/29017849/production-of-hiv-virus-like-particles-by-transient-transfection-of-cap-t-cells-at-bioreactor-scale-avoiding-medium-replacement
#3
Sonia Gutiérrez-Granados, Queralt Farràs, Kerstin Hein, Javier Fuenmayor, Pablo Félez, Mercedes Segura, Francesc Gòdia
Human-derived CAP-T cell line has been demonstrated to be a powerful platform for high-titer production of HIV virus-like particles (VLPs) by PEI-mediated transient transfection. Scale-up of transfection processes is key to ensure the necessary quantities for pre-clinical and clinical testing. One of the major operational challenges of large-scale transient transfection is the medium replacement step that is often required before transfection. In this work, CAP-T cells were cultured in 1L bioreactor with addition of sodium bicarbonate and surface aeration, which were observed to improve cell state for transfection...
October 7, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/29017848/suppression-of-cotton-leaf-curl-disease-symptoms-in-gossypium-hirsutum-through-over-expression-of-host-encoded-mirnas
#4
Mohd Akmal, Mirza S Baig, Jawaid A Khan
Cotton leaf curl disease (CLCuD), a major factor resulting in the enormous yield losses in cotton crop, is caused by a distinct monopartite begomovirus in association with Cotton leaf curl Multan betasatellite (CLCuMB). Micro(mi)RNAs are known to regulate gene expression in eukaryotes, including antiviral defense in plants. In a previous study, we had computationally identified a set of cotton miRNAs, which were shown to have potential targets in the genomes of Cotton leaf curl Multan virus (CLCuMuV) and CLCuMB at multiple loci...
October 7, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28988031/metabolic-engineering-of-escherichia-coli-for-production-of-valerenadiene
#5
S Eric Nybo, Jacqueline Saunders, Sean P McCormick
Valeriana officinalis is a medicinal herb which produces a suite of compounds in its root tissue useful for treatment of anxiety and insomnia. The sesquiterpene components of the root extract, valerenic acid and valerena-1,10-diene, are thought to contribute to most of the observed anxiolytic of Valerian root preparations. However, valerenic acid and its biosynthetic intermediates are only produced in low quantities in the roots of V. officinalis. Thus, in this report, Escherichia coli was metabolically engineered to produce substantial quantities of valerena-1,10-diene in shake flask fermentations with decane overlay...
October 5, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28988032/expanding-the-genetic-tool-box-for-cupriavidus-necator-by-a-stabilized-l-rhamnose-inducible-plasmid-system
#6
Anne Sydow, Andreas Pannek, Thomas Krieg, Ina Huth, Stéphane E Guillouet, Dirk Holtmann
The Gram negative bacterium Cupriavidus necator is well known for the accumulation of poly(3-hydroxybutyrate) and its fast lithoautotrophic growth, leading in high cell densities. Although the host was engineered for the heterologous production of diverse chemicals and biopolymers in recent years, tool box of stabilized inducible expression systems is still limited. To avoid plasmid loss during fermentation processes and to allow expression of complex proteins, a tunable L-rhamnose inducible system was established and characterized using enhanced green fluorescent protein (eGFP)...
October 4, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28986293/complete-genome-sequence-of-acidihalobacter-prosperus-strain-f5-an-extremely-acidophilic-iron-and-sulfur-oxidizing-halophile-with-potential-industrial-applicability-in-saline-water-bioleaching-of-chalcopyrite
#7
Himel N Khaleque, Melissa K Corbett, Joshua P Ramsay, Anna H Kaksonen, Naomi J Boxall, Elizabeth L J Watkin
Successful process development for the bioleaching of mineral ores, particularly the refractory copper sulfide ore chalcopyrite, remains a challenge in regions where freshwater is scarce and source water contains high concentrations of chloride ion. In this study, a pure isolate of Acidihalobacter prosperus strain F5 was characterized for its ability to leach base metals from sulfide ores (pyrite, chalcopyrite and pentlandite) at increasing chloride ion concentrations. F5 successfully released base metals from ores including pyrite and pentlandite at up to 30gL(-1) chloride ion and chalcopyrite up to 18gL(-1) chloride ion...
October 3, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28965975/metabolic-engineering-of-aspergillus-oryzae-for-efficient-production-of-l-malate-directly-from-corn-starch
#8
Jingjing Liu, Jianghua Li, Hyun-Dong Shin, Guocheng Du, Jian Chen, Long Liu
l-Malate, an important chemical building block, has been widely applied in the food, pharmaceutical, and bio-based materials industries. In previous work, we engineered Aspergillus oryzae by rewiring the reductive tricarboxylic acid pathway to produce l-malate from glucose. To decrease the production cost, here, we further engineered A. oryzae to efficiently produce l-malate directly from corn starch with simultaneous liquefaction-saccharification and fermentation. First, a promoter PN5 was constructed by quintuple tandem of the 97-bp fragment containing the cis-element of the glucoamylase gene promoter (PglaA), and with the promoter PN5, the transcriptional level of glaA gene increased by 25-45%...
September 28, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28965974/tridimensional-configurations-of-human-mesenchymal-stem-stromal-cells-to-enhance-cell-paracrine-potential-towards-wound-healing-processes
#9
Marta H G Costa, Todd C McDevitt, Joaquim M S Cabral, Cláudia L da Silva, Frederico Castelo Ferreira
This study proposes to use alginate encapsulation as a strategy to assess the paracrine activity of 3D- and 2D-cultured human bone marrow mesenchymal stem/stromal cells (BM MSC) in the setting of wound repair and regeneration processes. A side-by-side comparison of MSC culture in three different 3D configurations (spheroids, encapsulated spheroids and encapsulated single cells) versus 2D monolayer cell culture is presented. The results reveal enhanced resistance to oxidative stress and paracrine potential of 3D spheroid-organized BM MSC...
September 28, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28962841/effect-of-biologically-synthesized-copper-oxide-nanoparticles-on-metabolism-and-antioxidant-activity-to-the-crop-plants-solanum-lycopersicum-and-brassica-oleracea-var-botrytis
#10
Ajey Singh, N B Singh, Imtiyaz Hussain, Himani Singh
Study on the ecological effect of metal oxide nanomaterials (NMs) has quickly amplified over the precedent years because it is assumed that these NMs will sooner or later be released into the environment. The present study deals with biologically oriented process for the green synthesis of copper oxide nanoparticles (CuO NPs) by using Morus alba leaf extract as reducing agent. Powder X-ray diffraction (XRD) and transmission electron microscope (TEM) analysis revealed the monoclinic phase and 20-40nm size respectively...
September 28, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28958793/kinetic-resolution-of-1-2-diols-using-immobilized-burkholderia-cepacia-lipase-a-combined-experimental-and-molecular-dynamics-investigation
#11
Ashwini C Mathpati, Vijyesh K Vyas, Bhalchandra M Bhanage
Kinetic resolution of rac-1,2-diols using the biocatalyst Burkholderia cepacia lipase (BCL) immobilized on a biodegradable binary blend support of hydroxypropyl methyl cellulose(HPMC)/polyvinyl alcohol (PVA) has been investigated. The immobilization technique improved enzyme activity significantly and it has excellent recyclability with good yield and enantiomeric excess values up to the studied range of nine cycles. At optimum reaction conditions, conversion of 45-50% with excellent enantiomeric excess (up to 99% ee) were obtained...
September 25, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28947364/metabolic-and-process-engineering-for-biodesulfurization-in-gram-negative-bacteria
#12
I Martínez, M El-Said Mohamed, V E Santos, J L García, F García-Ochoa, E Díaz
Microbial desulfurization or biodesulfurization (BDS) is an attractive low-cost and environmentally friendly complementary technology to the hydrotreating chemical process based on the potential of certain bacteria to specifically remove sulfur from S-heterocyclic compounds of crude fuels that are recalcitrant to the chemical treatments. The 4S or Dsz sulfur specific pathway for dibenzothiophene (DBT) and alkyl-substituted DBTs, widely used as model S-heterocyclic compounds, has been extensively studied at the physiological, biochemical and genetic levels mainly in Gram-positive bacteria...
September 22, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28935568/genetically-engineered-oncolytic-newcastle-disease-virus-mediates-cytolysis-of-prostate-cancer-stem-like-cells
#13
Shobana Raghunath, Raghavendra Sumanth Pudupakam, Adria Allen, Moanaro Biswas, Nammalwar Sriranganathan
Oncolytic virotherapy is a promising novel approach that overcomes the limitations posed by radiation and chemotherapy. In this study, the oncolytic efficacy of a recombinant Newcastle disease virus (rNDV) BC-KLQL-GFP, against prostate cancer stem-like/tumor initiating cells was evaluated. Xenograft derived prostaspheres (XPS) induced tumor more efficiently than monolayer cell derived prostaspheres (MCPS) in nude mice. Primary and secondary XPS show enhanced self-renewal and clonogenic potential compared to MCPS...
September 19, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28935567/lactobacillus-fermentum-ftdc-8312-combats-hypercholesterolemia-via-alteration-of-gut-microbiota
#14
Huey-Shi Lye, Tamotsu Kato, Wai-Yee Low, Todd D Taylor, Tulika Prakash, Lee-Ching Lew, Hiroshi Ohno, Min-Tze Liong
In this study, hypercholesterolemic mice fed with Lactobacillus fermentum FTDC 8312 after a seven-week feeding trial showed a reduction in serum total cholesterol (TC) levels, accompanied by a decrease in serum low-density lipoprotein cholesterol (LDL-C) levels, an increase in serum high-density lipoprotein cholesterol (HDL-C) levels, and a decreased ratio of apoB100:apoA1 when compared to those fed with control or a type strain, L. fermentum JCM 1173. These have contributed to a decrease in atherogenic indices (TC/HDL-C) of mice on the FTDC 8312 diet...
September 19, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28935566/construction-of-protein-functionalized-virus-like-particles-of-parvovirus-b19
#15
Ismael Bustos-Jaimes, Ricardo Arturo Soto-Román, Isabel Alejandra Gutiérrez-Landa, Josefina Valadez-García, Carla Lizbeth Segovia-Trinidad
Decoration of virus-like particles (VLPs) expands the repertory of functions these particles can display. In the last years, VLPs have successfully been used as scaffolds to present different molecules, frequently through the specific reaction of chemical groups on the surface of the particles, or by protein engineering when the presentation of peptides or proteins is the primary goal. VLPs of parvovirus B19 (B19V), have been previously produced in vitro and its stability and ability to assemble into hybrid particles composed of wild-type and chimeric proteins evidenced their potential as research tools...
September 19, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28923717/production-of-d-tagatose-and-bioethanol-from-onion-waste-by-an-intergrating-bioprocess
#16
Ho Myeong Kim, Younho Song, Seung Gon Wi, Hyeun-Jong Bae
The rapid increase of agricultural waste is becoming a burgeoning problem and considerable efforts are being made by numerous researchers to convert it into a high-value resource material. Onion waste is one of the biggest issues in a world of dwindling resource. In this study, the potential of onion juice residue (OJR) for producing valuable rare sugar or bioethanol was evaluated. Purified Paenibacillus polymyxaL-arabinose isomerase (PPAI) has a molecular weight of approximately 53kDa, and exhibits maximal activity at 30°C and pH 7...
September 18, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28923716/investigation-of-the-effect-of-pomegranate-extract-and-monodisperse-silver-nanoparticle-combination-on-mcf-7-cell-line
#17
Birgütay Şahin, Enes Demir, Ayşenur Aygün, Hülya Gündüz, Fatih Şen
In this study, we aimed to investigate whether the combination therapy of pomegranate extract and silver nanoparticle is effective on MCF-7 cell culture. The pomegranate extract was mixed and incubated with silver nitrate for the microwave assisted green synthesized of silver nanoparticle. Obtained nanoparticles were investigated using X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), UV-vis, Field Emission Scanning Electron Microscopy (FESEM), and Transmission Electron Microscopy (TEM) methods The spectroscopic and morphological studies of the monodisperse Ag NPs which have particle size of 15...
September 18, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28923715/a-multiplex-bead-based-assay-for-immune-gene-expression-analysis-in-shrimp
#18
Sopacha Arayamethakorn, Nitsara Karoonuthaisiri, Wanilada Rungrassamee
Here, we developed a 9-plex bead-based array as a tool to evaluate molecular effects on transcription levels of immune-related genes in the black tiger shrimp (Penaeus monodon). The bead array technology allows simultaneous detection of multiple target genes in a single sample, reducing time, labor and cost. The oligonucleotide probes were designed to target eight immune-related genes that involve in antimicrobial activity, melanization, pathogen pattern recognition proteins, lysozyme and one housekeeping gene as an internal control...
September 18, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28919459/genome-content-metabolic-pathways-and-biotechnological-potential-of-the-psychrophilic-arctic-bacterium-psychrobacter-sp-dab_al43b-a-source-and-a-host-of-novel-psychrobacter-specific-vectors
#19
Robert Lasek, Lukasz Dziewit, Anna Ciok, Przemyslaw Decewicz, Krzysztof Romaniuk, Zuzanna Jedrys, Daniel Wibberg, Andreas Schlüter, Alfred Pühler, Dariusz Bartosik
Psychrobacter sp. DAB_AL43B, isolated from ornithogenic soil collected on the Arctic island of Spitsbergen, is a newly sequenced psychrophilic strain susceptible to conjugation and electrotransformation. Its genome consists of a circular chromosome (3.3 Mb) and four plasmids (4.4-6.4kb). In silico genome mining and microarray-based phenotypic analysis were performed to describe the metabolic potential of this strain and identify possible biotechnological applications. Metabolic reconstruction indicated that DAB_AL43B prefers low-molecular-weight carboxylates and amino acids as carbon and energy sources...
September 14, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28917932/rewiring-neutral-lipids-production-for-the-de-novo-synthesis-of-wax-esters-in-rhodococcus-opacus-pd630
#20
Mariana P Lanfranconi, Héctor M Alvarez
Rhodococcus opacus PD630 accumulates significant amounts of triacylglycerols (TAG), but is not able to de novo synthesize wax esters (WE) from structural unrelated carbon sources, such as gluconate. In this study, strain PD630 was engineered to produce WE by heterologous expression of maqu_2220 gene, which encodes a fatty acyl-CoA reductase for the production of fatty alcohols in Marinobacter hydrocarbonoclasticus. Recombinant cells produced ca. 46% of WE and 54% of TAG (of total WE+TAG) from gluconate compared with the wild type, which produced 100% of TAG...
September 14, 2017: Journal of Biotechnology
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