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New Biotechnology

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https://www.readbyqxmd.com/read/29909071/impact-of-the-treatment-of-nh-3-emissions-from-pig-farms-on-greenhouse-gas-emissions-quantitative-assessment-from-the-literature-data
#1
Éric Dumont
In order to limit ammonia (NH3 ) emissions from pig farms, various air cleaning solutions are widely applied. However, the literature data report that these systems (chemical scrubbers, bioscrubbers and biofilters) can be both inefficient and promote nitrous oxide (N2 O) production. As air cleaning technologies should not contribute to secondary trace gases that may have a stronger environmental impact than the raw gas compounds themselves, the objective of this study was to quantify the effect of NH3 treatment in pig farms on greenhouse gas (GHG) emissions...
June 14, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29902527/the-use-of-multiwell-culture-plates-in-the-duckweed-toxicity-test-a-case-study-on-zn-nanoparticles
#2
Gabriela Kalčíková, Gregor Marolt, Anita Jemec Kokalj, Andreja Žgajnar Gotvajn
Extensive production of nanomaterials of various properties needs to be coupled with rapid toxicity testing in order to provide information about their potential risks to the environment and human health. Miniaturization of toxicity tests may accelerate economical testing of nanomaterials, but is not a common practice. We describe a case study to miniaturize a commonly used toxicity test with plant duckweed Lemna minor. 6-well, 12-well and 24-well culture plates were used to assess their potential use for the duckweed toxicity test with potassium chloride as reference material...
June 11, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29870785/rapid-purification-of-billions-of-circulating-cd19-b-cells-directly-from-leukophoresis-samples
#3
Fortunato Ferrara, Martin Kolnik, Sara D'Angelo, Frank M Erasmus, Daniela Vorholt, Andrew R M Bradbury
The study of the biology and function of B cells, or the dissection and in vitro creation of enormous recombinant antibody repertoires, requires the isolation of large numbers of pure CD19+ B cells. The StraightFrom® Leukopak CD19 MicroBead Kit was recently introduced as a fast and robust kit to isolate human CD19+ B cells. This uses paramagnetic microbeads conjugated to high-affinity anti-CD19 monoclonal antibodies to bind B cells in leukapheresis (Leukopak) samples. The overall purity of the isolated cells, together with the characterization of the different CD19+ subclasses, was assessed by flow cytometry using a recombinant (REAffinity) antibody panel, revealing that the method allowed the recovery of over 93% of CD19+ B cells without any pre-purification step...
June 2, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29864580/development-of-a-simple-intensified-fermentation-strategy-for-growth-of-magnetospirillum-gryphiswaldense-msr-1-physiological-responses-to-changing-environmental-conditions
#4
Alfred Fernández-Castané, Hong Li, Owen R T Thomas, Tim W Overton
The development of a simple pH-stat fed-batch fermentation strategy for the production of Magnetospirillum gryphiswaldense MSR-1 and magnetosomes (nanoscale magnetic organelles with biotechnological applications) is described. Flow cytometry was exploited as a powerful analytical tool for process development, enabling rapid monitoring of cell morphology, physiology and polyhydroxyalkanoate production. The pH-stat fed-batch growth strategy was developed by varying the concentrations of the carbon source (lactic acid) and the alternative electron acceptor (sodium nitrate) in the feed...
June 1, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29842936/plant-biotechnology-green-for-good-iv
#5
EDITORIAL
Petr Tarkowski, Ivo Frébort
No abstract text is available yet for this article.
May 26, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29803771/saccharification-efficiencies-of-multi-enzyme-complexes-produced-by-aerobic-fungi
#6
Ajay Badhan, Jiangli Huang, Yuxi Wang, D Wade Abbott, Marcos Di Falco, Adrian Tsang, Tim McAllister
In the present study, we have characterized high molecular weight multi-enzyme complexes in two commercial enzymes produced by Trichoderma reesei (Spezyme CP) and Penicillium funiculosum (Accellerase XC). We successfully identified 146-1000 kDa complexes using Blue native polyacrylamide gel electrophoresis (BN-PAGE) to fractionate the protein profile in both preparations. Identified complexes dissociated into lower molecular weight constituents when loaded on SDS PAGE. Unfolding of the secondary structure of multi-enzyme complexes with trimethylamine (pH >10) suggested that they were not a result of unspecific protein aggregation...
May 24, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29782934/effects-of-copper-and-arsenic-stress-on-the-development-of-norway-spruce-somatic-embryos-and-their-visualization-with-the-environmental-scanning-electron-microscope
#7
Biljana Đorđević, Vilém Neděla, Eva Tihlaříková, Václav Trojan, Ladislav Havel
Somatic embryogenesis is an important biotechnological technique which can be used in studies associated with environmental stress. Four embryogenic cell lines of Norway spruce were grown on media enriched with copper and arsenic in concentration ranges 50-500 μM and 10-50 μM, respectively. The effects were observed during subsequent stages of somatic embryogenesis, the characteristics evaluated being proliferation potential, average number of somatic embryos obtained per g/fresh weight, morphology of developed somatic embryos, metal uptake, and microanalysis of macro- and micronutrients uptake...
May 18, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29768182/enhanced-production-and-immunological-characterization-of-recombinant-west-nile-virus-envelope-domain-iii-protein
#8
Nagesh K Tripathi, Divyanshi Karothia, Ambuj Shrivastava, Swati Banger, Jyoti S Kumar
West Nile virus (WNV) is an emerging mosquito-borne virus which is responsible for severe and fatal encephalitis in humans and for which there is no licensed vaccine or therapeutic available to prevent infection. The envelope domain III protein (EDIII) of WNV was over-expressed in Escherichia coli and purified using a two-step chromatography process which included immobilized metal affinity chromatography and ion exchange chromatography. E. coli cells were grown in a bioreactor to high density using batch and fed-batch cultivation...
May 13, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29763736/generating-a-recombinant-phosphothreonine-binding-domain-for-a-phosphopeptide-of-the-human-transcription-factor-c-myc
#9
Leon A Venegas, Stefanie L Kall, Oluwadamilola Bankole, Arnon Lavie, Brian Kay
Transcription factor c-Myc is an oncoprotein that is regulated at the post-translational level through phosphorylation of two conserved residues, Serine 62 (Ser62) and Threonine 58 (Thr58). A highly specific tool capable of recognizing Myc via pThr58 is needed to monitor activation and localization. Through phage display, we have isolated 10 engineered Forkhead-associated (FHA) domains that selectively bind to a phosphothreonine (pThr)-containing peptide (53-FELLPpTPPLSPS-64) segment of human c-Myc. One domain variant was observed to bind to the Myc-pThr58 peptide with a KD value of 800 nM and had >1,000-fold discrimination between the phosphorylated and non-phosphorylated peptide...
May 12, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29758351/development-of-microreactors-with-surface-immobilized-biocatalysts-for-continuous-transamination
#10
Nataša Miložič, Gorazd Stojkovič, Andreas Vogel, Dominique Bouwes, Polona Žnidaršič-Plazl
The industrial importance of optically pure compounds has thrown a spotlight on ω-transaminases that have shown a high potential for the synthesis of bioactive compounds with a chiral amine moiety. The implementation of biocatalysts in industrial processes relies strongly on fast and cost effective process development, including selection of a biocatalyst form and the strategy for its immobilization. Here, microscale reactors with selected surface-immobilized amine-transaminase (ATA) in various forms are described as platforms for high-throughput process development...
May 11, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29727712/overexpression-of-acetyl-coa-carboxylase-in-aspergillus-terreus-to-increase-lovastatin-production
#11
Hanan Hasan, Muhammad Hafiz Abd Rahim, Leona Campbell, Dee Carter, Ali Abbas, Alejandro Montoya
The present work describes the application of homologous recombination techniques in a wild-type Aspergillus terreus (ATCC 20542) strain to increase the flow of precursors towards the lovastatin biosynthesis pathway. A new strain was generated to overexpress acetyl-CoA carboxylase (ACCase) by replacing the native ACCase promoter with a strong constitutive PadhA promoter from Aspergillus nidulans. Glycerol and a mixture of lactose and glycerol were used independently as the carbon feedstock to determine the degree of response by the A...
May 1, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29704649/preparation-of-a-robust-immobilized-biocatalyst-of-%C3%AE-1-4-endoxylanase-by-surface-coating-with-polymers-for-production-of-xylooligosaccharides-from-different-xylan-sources
#12
Maria Romero-Fernández, Sonia Moreno-Perez, Sandro Martins de Oliveira, Ramón I Santamaría, Jose M Guisan, Javier Rocha-Martin
Xylooligosaccharides display interesting prebiotic effects on human health. The endoxylanase Xys1Δ, from Streptomyces halstedii JM8, was immobilized and stabilized on glyoxyl-agarose beads by multipoint covalent attachment using a novel strategy based on surface coating with a multilayer of polymers. The optimal modification consisted of surface coating with a bilayer formed by a layer of derived dextran polymers and a layer of polyethylenimine. The optimized biocatalyst was 550-fold more stable than one-point covalent immobilized Xys1Δ (at 70 °C, pH 7)...
April 25, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29702249/nanoreactors-strategies-to-encapsulate-enzyme-biocatalysts-in-virus-like-particles
#13
Joshua W Wilkerson, Seung-Ook Yang, Parker J Funk, Steven K Stanley, Bradley C Bundy
Enzyme-mediated biocatalysis is generally more selective and environmentally friendly and requires less energy than chemocatalysis. However, factors such as temperature, acidity and the presence of proteases can negate enzyme activity. Encapsulation in virus-like particles is one promising method to mitigate these difficulties. Encapsulation also can be used to create multi-reaction nanoreactors that increase process efficiency by isolating reaction intermediates. To successfully encapsulate enzymes, a variety of methods involving both non-covalent and covalent interactions have been developed...
April 24, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29684657/engineering-low-cadmium-rice-through-stress-inducible-expression-of-oxs3-family-member-genes
#14
Changhu Wang, Weili Guo, Xingzhe Cai, Ruyu Li, David W Ow
Cadmium (Cd) as a carcinogen poses a great threat to food security and public health through plant-derived foods such as rice, the staple for nearly half of the world's population. We have previously reported that overexpression of truncated gene fragments derived from the rice genes OsO3L2 and OsO3L3 could reduce Cd accumulation in transgenic rice. However, we did not test the full length genes due to prior work in Arabidopsis where overexpression of these genes caused seedling lethality. Here, we report on limiting the overexpression of OsO3L2 and OsO3L3 through the use of the stress- inducible promoter RD29B...
April 21, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29684658/caught-in-between-system-for-in-flow-inactivation-of-enzymes-as-an-intermediary-step-in-plug-and-play-microfluidic-platforms
#15
Ana C Fernandes, Benjamin Petersen, Lars Møller, Krist V Gernaey, Ulrich Krühne
The need for fast and comprehensive characterization of biocatalysts has pushed the development of new screening platforms based on microfluidics, capable of monitoring several parameters simultaneously, with new configurations of liquid handling, sample treatment and sensing. Modular microfluidics allows the integration of these newly developed approaches in a more flexible way towards increasing applicability of the microfluidic chips to different types of biocatalysts and reactions. A highly relevant operation in such a system is biocatalyst inactivation, which can enable the precise control of reaction time by avoiding the continuation of the reaction in another module or connecting tubes...
April 20, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29656128/agrobacterium-rhizogenes-mediated-transformation-of-a-dioecious-plant-model-silene-latifolia
#16
Vojtech Hudzieczek, Radim Cegan, Tomas Cermak, Nela Bacovska, Zuzana Machalkova, Karel Dolezal, Lucie Plihalova, Daniel Voytas, Roman Hobza, Boris Vyskot
Silene latifolia serves as a model species to study dioecy, the evolution of sex chromosomes, dosage compensation and sex-determination systems in plants. Currently, no protocol for genetic transformation is available for this species, mainly because S. latifolia is considered recalcitrant to in vitro regeneration and infection with Agrobacterium tumefaciens. Using cytokinins and their synthetic derivatives, we markedly improved the efficiency of regeneration. Several agrobacterial strains were tested for their ability to deliver DNA into S...
April 12, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29635104/generation-and-validation-of-murine-monoclonal-and-camelid-recombinant-single-domain-antibodies-specific-for-human-pancreatic-glycoprotein-2
#17
Anja Schlör, Pamela Holzlöhner, Martin Listek, Cindy Grieß, Monique Butze, Burkhard Micheel, Christian Hentschel, Mandy Sowa, Dirk Roggenbuck, Peter Schierack, Jonas Füner, Erik Schliebs, Alexander Goihl, Dirk Reinhold, Katja Hanack
Pancreatic secretory zymogen-granule membrane glycoprotein 2 (GP2) has been identified as a major autoantigenic target in Crohn's disease patients. It was reported recently that a long (GP2a) and a short (GP2b) isoform of GP2 exist and that in the outcome of inflammatory bowel diseases (IBD) GP2-specific autoantibodies probably appear as new serological markers for diagnosis and therapeutic monitoring. To investigate this further and in order to establish diagnostic tools for the discrimination of both GP2 isoforms, a set of different murine monoclonal and camelid recombinant single domain antibodies (camelid VHH) was generated and validated in various enzyme-linked immunosorbent assay (ELISA) formats, immunofluorescence on transgenic cell lines and immunohistochemistry on monkey pancreas tissue sections...
April 7, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29614323/optimization-of-aqueous-two-phase-systems-for-the-production-of-6-aminopenicillanic-acid-in-integrated-microfluidic-reactors-separators
#18
Lucie Vobecká, Alexandr Romanov, Zdeněk Slouka, Pavel Hasal, Michal Přibyl
Aqueous two-phase systems (ATPSs) were screened for the production of 6-aminopenicillanic acid (6-APA) catalyzed by penicillin acylase, followed by the extractive separation of 6-APA from the reaction mixture. The key point of this study was to find an ATPS exhibiting a large difference in the partition coefficients of the biocatalyst and reaction products. Several ATPSs based on polyethylene glycol (PEG)/phosphate, PEG/citrate, and PEG/dextran were tested. We found that an ATPS consisting of 15 wt% of PEG 4000, 10 wt% of phosphates, 75 wt% of water (pH value 8...
March 31, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29477600/improved-continuous-fumaric-acid-production-with-immobilised-rhizopus-oryzae-by-implementation-of-a-revised-nitrogen-control-strategy
#19
Andre Naude, Willie Nicol
A novel fermentation system was employed whereby the mycelial mat of Rhizopus oryzae was attached to a polypropylene tube. Batch operation was used for growth, while continuous operation was employed during the fumaric acid production phase. A clear decrease in respiration, fumaric acid (FA) and ethanol production was observed when zero nitrogen was fed in the production phase, with FA productivity decreasing from an initial 0.7 g L-1  h-1 to 0.3 g L-1  h-1 after 150 h. With the addition of 0...
March 23, 2018: New Biotechnology
https://www.readbyqxmd.com/read/29689306/core-element-characterization-of-rhodococcus-promoters-and-development-of-a-promoter-rbs-mini-pool-with-different-activity-levels-for-efficient-gene-expression
#20
Song Jiao, Huimin Yu, Zhongyao Shen
To satisfy the urgent demand for promoter engineering that can accurately regulate the metabolic circuits and expression of specific genes in the Rhodococcus microbial platform, a promoter-ribosome binding site (RBS) coupled mini-pool with fine-tuning of different activity levels was successfully established. Transcriptome analyses of R. ruber TH revealed several representative promoters with different activity levels, e.g., Pami, Pcs, Pnh, P50sl36, PcbiM, PgroE and Pniami. β-Galactosidase (LacZ) reporter measurement demonstrated that different gene expression levels could be obtained with these natural promoters combined with an optimal RBS of ami...
September 25, 2018: New Biotechnology
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