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https://www.readbyqxmd.com/read/29886519/fixation-of-carbon-dioxide-by-a-hydrogen-oxidizing-bacterium-for-value-added-products
#1
REVIEW
Jian Yu
With rapid technology progress and cost reduction, clean hydrogen from water electrolysis driven by renewable powers becomes a potential feedstock for CO2 fixation by hydrogen-oxidizing bacteria. Cupriavidus necator (formally Ralstonia eutropha), a representative member of the lithoautotrophic prokaryotes, is a promising producer of polyhydroxyalkanoates and single cell proteins. This paper reviews the fundamental properties of the hydrogen-oxidizing bacterium, the metabolic activities under limitation of individual gases and nutrients, and the value-added products from CO2 , including the products with large potential markets...
June 9, 2018: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/29860285/investigating-the-effectiveness-of-current-and-modified-world-health-organization-guidelines-for-the-control-of-soil-transmitted-helminth-infections
#2
Sam H Farrell, Luc E Coffeng, James E Truscott, Marleen Werkman, Jaspreet Toor, Sake J de Vlas, Roy M Anderson
Background: Considerable efforts have been made to better understand the effectiveness of large-scale preventive chemotherapy therapy for the control of morbidity caused by infection with soil-transmitted helminths (STHs): Ascaris lumbricoides, Trichuris trichiura, and the 2 hookworm species, Necator americanus and Ancylostoma duodenale. Current World Health Organization (WHO) guidelines for STH control include mass drug administration (MDA) programs based on prevalence measurements, aiming at reducing morbidity in pre-school-aged children (pre-SAC) and school-aged children (SAC) by lowering the prevalence of moderate- to heavy-intensity infections to <1%...
June 1, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29809320/nickel-nanoparticles-embedded-n-doped-carbon-nanotubes-as-a-biocompatible-electrocatalyst-in-a-water-splitting-biosynthetic-hybrid-system-for-co2-conversion
#3
Zhongjian Li, Gang Li, Xinlu Chen, Zheng Xia, Jiani Yao, Bin Yang, Lecheng Lei, Yang Hou
CO2 reduction has drawn increasing attention due to the concern of global warming. Water splitting-biosynthetic hybrid systems are novel and efficient approaches for CO2 conversion. Intimate coupling of electrocatalysts and biosynthesis requires the catalysts possess both high catalytic performance and excellent biocompatibility, which is a bottleneck of developing such catalysts. Here, a novel Ni nanoparticles-embedded N-doped carbon nanotubes (Ni@N-C) complex was synthesized as a hydrogen evolution reaction electrocatalyst and was coupled with a hydrogen-oxidizing autotroph, Cupriavidus necator H16, to convert CO2 to poly-β-hydroxybutyrate...
May 29, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29799066/genome-characteristics-dictate-poly-r-3-hydroxyalkanoate-production-in-cupriavidus-necator-h16
#4
REVIEW
Gurusamy Kutralam-Muniasamy, Fermín Peréz-Guevara
Cupriavidus necator H16 is a well-recognized enterprise with efficient manufacturing machineries to produce diverse polymers belonging to polyhydroxyalkanoates (PHAs) family. The genome fingerprints, including PHA machinery proteins and fatty acid metabolism, had educated engineering strategies to enhance PHAs production. This outstanding progress has enlightened us to present an exhaustive examination of the ongoing research, addressing the great potential design of genome features towards PHA production and furthermore, we show how those acquired knowledge have been explored in other biotechnological applications...
May 24, 2018: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/29787243/benchmark-analysis-of-native-and-artificial-nad-dependent-enzymes-generated-by-a-sequence-based-design-method-with-or-without-phylogenetic-data
#5
Shogo Nakano, Tomoharu Motoyama, Yurina Miyashita, Yuki Ishizuka, Naoya Matsuo, Hiroaki Tokiwa, Suguru Shinoda, Yasuhisa Asano, Sohei Ito
The expansion of protein sequence databases has enabled us to design artificial proteins by sequence-based design methods, such as full consensus design (FCD) and ancestral sequence reconstruction (ASR). Artificial proteins with enhanced activity levels compared with native ones can potentially be generated by such methods, but successful design is rare because preparing a sequence library by curating the database and selecting a method is difficult. Utilizing a curated library prepared by reducing conservation energies, we successfully designed two artificial L-threonine 3-dehydrogenase (SDR-TDH) with higher activity levels than native SDR-TDH, FcTDH-N1 and AncTDH, using FCD and ASR, respectively...
May 22, 2018: Biochemistry
https://www.readbyqxmd.com/read/29780848/controlled-human-hookworm-infection-accelerating-human-hookworm-vaccine-development
#6
David Diemert, Doreen Campbell, Jill Brelsford, Caitlyn Leasure, Guangzhao Li, Jin Peng, Maria Zumer, Naji Younes, Maria Elena Bottazzi, Rojelio Mejia, David I Pritchard, John M Hawdon, Jeffrey M Bethony
Background: Controlled human hookworm infection (CHHI) is a central component of a proposed hookworm vaccination-challenge model (HVCM) to test the efficacy of candidate vaccines. Critical to CHHI is the manufacture of Necator americanus infective larvae ( Na L3) according to current Good Manufacturing Practice (cGMP) and the determination of an inoculum of Na L3 that is safe and reliably induces patent infection. Methods: cGMP-grade Na L3 were produced for a phase 1 trial in 20 healthy, hookworm-naïve adults in the United States, who received either 25 or 50 Na L3...
May 2018: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/29772478/bacillus-thuringiensis-cry5b-protein-as-a-new-pan-hookworm-cure
#7
Yan Hu, Thanh-Thanh Nguyen, Alice C Y Lee, Joseph F Urban, Melanie M Miller, Bin Zhan, David J Koch, Jason B Noon, Ambily Abraham, Ricardo Toshio Fujiwara, Dwight D Bowman, Gary R Ostroff, Raffi V Aroian
Hookworms are intestinal nematode parasites that infect nearly half a billion people and are globally one of the most important contributors to iron-deficiency anemia. These parasites have significant impacts in developing children, pregnant women and working adults. Of all the soil-transmitted helminths or nematodes (STNs), hookworms are by far the most important, with disease burdens conservatively estimated at four million DALYs (Disability-Adjusted Life Years) and with productivity losses of up to US$139 billion annually...
May 4, 2018: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/29698424/poly-3-hydroxybutyrate-production-in-an-integrated-electromicrobial-setup-investigation-under-stress-inducing-conditions
#8
Israa Salem Al Rowaihi, Alexis Paillier, Shahid Rasul, Ram Karan, Stefan Wolfgang Grötzinger, Kazuhiro Takanabe, Jörg Eppinger
Poly(3-hydroxybutyrate) (PHB), a biodegradable polymer, can be produced by different microorganisms. The PHB belongs to the family of polyhydroxyalkanoate (PHA) that mostly accumulates as a granule in the cytoplasm of microorganisms to store carbon and energy. In this study, we established an integrated one-pot electromicrobial setup in which carbon dioxide is reduced to formate electrochemically, followed by sequential microbial conversion into PHB, using the two model strains, Methylobacterium extorquens AM1 and Cupriavidus necator H16...
2018: PloS One
https://www.readbyqxmd.com/read/29692952/development-of-a-quantitative-loop-mediated-isothermal-amplification-assay-for-the-field-detection-of-erysiphe-necator
#9
Lindsey D Thiessen, Tara M Neill, Walter F Mahaffee
Plant pathogen detection systems have been useful tools to monitor inoculum presence and initiate management schedules. More recently, a loop-mediated isothermal amplification (LAMP) assay was successfully designed for field use in the grape powdery mildew pathosystem; however, false negatives or false positives were prevalent in grower-conducted assays due to the difficulty in perceiving the magnesium pyrophosphate precipitate at low DNA concentrations. A quantitative LAMP (qLAMP) assay using a fluorescence resonance energy transfer-based probe was assessed by grape growers in the Willamette Valley of Oregon...
2018: PeerJ
https://www.readbyqxmd.com/read/29678915/-ralstonia-eutropha-s-poly-3-hydroxybutyrate-phb-polymerase-phac1-and-phb-depolymerase-phaza1-are-phosphorylated-in-vivo
#10
Janina R Jüngert, Cameron Patterson, Dieter Jendrossek
In this study, we screened PHB synthase PhaC1 and PHB depolymerase PhaZa1 of Ralstonia eutropha for the presence of phosphorylated residues during the PHB accumulation and PHB degradation phase. Thr373 of PHB synthase PhaC1 was phosphorylated in the stationary growth phase but was not modified in the exponential and PHB accumulation phases. Ser35 of PHB depolymerase PhaZa1 was identified in phosphorylated form both in the exponential and in the stationary growth phase. Additional phosphosites were identified for both proteins in sample-dependent forms...
April 20, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29670877/identification-of-inhibitors-in-lignocellulosic-slurries-and-determination-of-their-effect-on-hydrocarbon-producing-microorganisms
#11
Shihui Yang, Mary Ann Franden, Qing Yang, Yat-Chen Chou, Min Zhang, Philip T Pienkos
The aim of this work was to identify inhibitors in pretreated lignocellulosic slurries, evaluate high-throughput screening strategies, and investigate the impact of inhibitors on potential hydrocarbon-producing microorganisms. Compounds present in slurries that could inhibit microbial growth were identified through a detailed analysis of saccharified slurries by applying a combination of approaches of high-performance liquid chromatography, GC-MS, LC-DAD-MS, and ICP-MS. Several high-throughput assays were then evaluated to generate toxicity profiles...
2018: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/29667925/massive-over-representation-of-solute-binding-proteins-sbps-from-the-tripartite-tricarboxylate-transporter-ttt-family-in-the-genome-of-the-%C3%AE-proteobacterium-rhodoplanes-sp-z2-yc6860
#12
Leonardo T Rosa, Vicki Springthorpe, Matheus E Bianconi, Gavin H Thomas, David J Kelly
Lineage-specific expansion (LSE) of protein families is a widespread phenomenon in many eukaryotic genomes, but is generally more limited in bacterial genomes. Here, we report the presence of 434 genes encoding solute-binding proteins (SBPs) from the tripartite tricarboxylate transporter (TTT) family, within the 8.2 Mb genome of the α-proteobacterium Rhodoplanes sp. Z2-YC6860, a gene family over-representation of unprecedented abundance in prokaryotes. Representing over 6 % of the total number of coding sequences, the SBP genes are distributed across the whole genome but are found rarely in low-GC islands, where the gene density for this family is much lower...
April 18, 2018: Microbial Genomics
https://www.readbyqxmd.com/read/29666725/elevated-serum-igg4-levels-in-a-young-patient-with-polyserositis-and-necator-americanus-infection
#13
Giuseppe D Sanna, Roberto Manetti, Valentina de Filippo, Sergio Babudieri
IgG4-related disease is a fibroinflammatory systemic condition characterized by tumefactive lesions, lymphoplasmacytic infiltrate rich in IgG4-positive plasma cells, storiform fibrosis, and elevated serum IgG4 concentrations. It has been described in virtually every organ system. Autoimmunity and infectious agents are potential immunologic triggers in IgG4-related disease. Herein, we describe a peculiar case of effusive-constrictive pericarditis in an 18-year-old boy with polyserositis and concomitant Necator americanus infection...
2018: Case Reports in Immunology
https://www.readbyqxmd.com/read/29662713/are-the-skin-scar-characteristics-and-closure-of-the-parietal-peritoneum-associated-with-pelvic-adhesions
#14
Numan Çim, Erkan Elçi, Gülhan Güneş Elçi, Necat Almalı, Recep Yıldızhan
Objective: To assess whether the abdominal scar characteristics and closure of the peritoneum were associated with pelvic adhesions. Materials and Methods: Patients who had undergone cesarean section between December 2015 and February 2016 were assessed prospectively in terms of age, gravida, body mass index, number of living children, number of cesarean sections, time passed since the last cesarean section, closure status of the peritoneum in the last cesarean section, presence of other diseases, smoking status, location of incision in the abdomen (medial, pfannenstiel) scar dimensions (length, width), scar status with respect to skin (hypertrophic, flat, depressive), scar color [color change/no color change (hyperpigmented/hypopigmented)], adhesion of bowel-omentum-uterus, omentum-anterior abdominal wall, uterus-anterior abdominal wall, uterus-bladder, bladder-anterior abdominal wall, fixed uterus, and uterus-omentum-anterior abdominal wall in abdominal exploration...
March 2018: Turkish Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29660658/nuclease-expression-in-efficient-polyhydroxyalkanoates-producing-bacteria-could-yield-cost-reduction-during-downstream-processing
#15
Jesús E Rodríguez Gamero, Lorenzo Favaro, Valentino Pizzocchero, Giovanna Lomolino, Marina Basaglia, Sergio Casella
Industrial manufacturing of polyhydroxyalkanoates (PHAs) requires purification of PHAs granules from high-cell-density cultures. Cells are broken by homogenization and PHAs granules are cleansed and treated to obtain PHAs latexes. However, cell lysis releases large amounts of DNA which results in an increasing viscosity of the medium, hampering the following downstream steps. Drop in viscosity is generally achieved by costly procedures such as heat treatment or the supplementation of hypochlorite and commercially available nucleases...
August 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29588070/parasite-allergens
#16
Luis Caraballo, Sandra Coronado
Human IgE against helminths is a normal component of the whole protective response elicitesd during infection, when specific IgE to a great number of antigens is produced; however, few of those IgE binding components are actually allergens. In general, considering the strong Th2/IgE responses during helminth infections is intriguing that they are not usually associated with allergic symptoms, which probably (but not exclusively) depends on parasite-induced immunomodulation. However, allergic manifestations have been described during some helminth infections such as ascariasis, strongyloidiasis, anisakiasis and hydatidosis...
March 24, 2018: Molecular Immunology
https://www.readbyqxmd.com/read/29566094/a-novel-blood-feeding-detoxification-pathway-in-nippostrongylus-brasiliensis-l3-reveals-a-potential-checkpoint-for-arresting-hookworm-development
#17
Tiffany Bouchery, Kara Filbey, Amy Shepherd, Jodie Chandler, Deepa Patel, Alfonso Schmidt, Mali Camberis, Adeline Peignier, Adam A T Smith, Karen Johnston, Gavin Painter, Mark Pearson, Paul Giacomin, Alex Loukas, Maria-Elena Bottazzi, Peter Hotez, Graham LeGros
As part of on-going efforts to control hookworm infection, the "human hookworm vaccine initiative" has recognised blood feeding as a feasible therapeutic target for inducing immunity against hookworm infection. To this end, molecular approaches have been used to identify candidate targets, such as Necator americanus (Na) haemoglobinase aspartic protease-1 (APR-1), with immunogenicity profiled in canine and hamster models. We sought to accelerate the immune analysis of these identified therapeutic targets by developing an appropriate mouse model...
March 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29563849/-ancylostoma-ceylanicum-novel-etiological-agent-for-traveler-s-diarrhea-report-of-four-japanese-patients-who-returned-from-southeast-asia-and-papua-new-guinea
#18
Masahide Yoshikawa, Yukiteru Ouji, Nobuyasu Hirai, Fukumi Nakamura-Uchiyama, Minoru Yamada, Naoki Arizono, Naoaki Akamatsu, Takaharu Yoh, Daisuke Kaya, Toshiya Nakatani, Eiryo Kikuchi, Yuichi Katanami, Kimitoshi Satoh, Ryosuke Maki, Yusuke Miyazato, Yuichiro Oba, Kei Kasahara, Keiichi Mikasa
Background: Countries in the Southeast Asia region have a high prevalence of soil-transmitted helminth, such as roundworm, whipworm, and hookworms [ Ancylostoma duodenale , Necator americanus , Ancylostoma ceylanicum ]. Recent molecular-based surveys have revealed that A . ceylanicum , a zoonotic hookworm, is likely the second most prevalent hookworm species infecting humans in that part of the world, while others have noted that this infection is an emerging public health risk not only for indigenous people but also for visitors from other countries...
2018: Tropical Medicine and Health
https://www.readbyqxmd.com/read/29549002/development-of-a-plasmid-based-tunable-tolc-derived-expression-system-for-application-in-cupriavidus-necator-h16
#19
Elhussiny A Aboulnaga, Huibin Zou, Thorsten Selmer, Mo Xian
Cupriavidus necator H16 gains increasing attention in microbial research and biotechnological application due to its diverse metabolic features. Here we present a tightly controlled gene expression system for C. necator including the pBBR1-vector that contains hybrid promoters originating from C. necator native tolC-promoter in combination with a synthetic tetO-operator. The expression of the reporter gene from these plasmids relies on the addition of the exogenous inducer doxycycline (dc). The novel expression system offers a combination of advantageous features as; (i) high and dose-dependent recombinant protein production, (ii) tight control with a high dynamic range (On/Off ratio), which makes it applicable for harmful pathways or for toxic protein production, (iii) comparable cheap inducer (doxycycline, dc), (iv) effective at low inducer concentration, that makes it useful for large scale application, (v) rapid, diffusion controlled induction, and (vi) the inducer does not interfere within the cell metabolism...
May 20, 2018: Journal of Biotechnology
https://www.readbyqxmd.com/read/29536770/toxic-effect-of-acetamiprid-on-rana-ridibunda-sciatic-nerve-electrophysiological-and-histopathological-potential
#20
Yusuf Çamlıca, Salih Cüfer Bediz, Ülkü Çömelekoğlu, Şakir Necat Yilmaz
In this study, the effects of a neonicotinoid insecticide acetamiprid on the sciatic nerve of Rana ridibunda were investigated by using electrophysiological and histological methods. A total of 35 preparations of sciatic nerve isolated from 35 frogs (Nervus ischiadicus) were used in the experiments. Experiments were designed as four different dose groups (n = 8 per group). Acetamiprid solutions of 1 (group 1), 10 (group 2), 100 (group 3), and 1000 µM (group 4) were applied to the nerves in dose groups...
March 14, 2018: Drug and Chemical Toxicology
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