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https://www.readbyqxmd.com/read/28108864/is-raf1-protein-from-synechocystis-sp-pcc-6803-really-needed-in-the-cyanobacterial-rubisco-assembly-process
#1
Piotr Kolesinski, Malgorzata Rydzy, Andrzej Szczepaniak
Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) is responsible for carbon dioxide conversion during photosynthesis and, therefore, is the most important protein in biomass generation. Modifications of this biocatalyst toward improvements in its properties are hindered by the complicated and not yet fully understood assembly process required for the formation of active holoenzymes. An entire set of auxiliary factors, including chaperonin GroEL/GroES and assembly chaperones RbcX or Rubisco accumulation factor 1 (RAF1), is involved in the folding and subsequent assembly of Rubisco subunits...
January 20, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28108411/production-and-characterization-of-medium-chain-length-polyhydroxyalkanoates-copolymer-from-arctic-psychrotrophic-bacterium-pseudomonas-sp-pamc-28620
#2
Ganesan Sathiyanarayanan, Shashi Kant Bhatia, Hun-Suk Song, Jong-Min Jeon, Jun-Young Kim, Yoo Kyung Lee, Yun-Gon Kim, Yung-Hun Yang
Arctic psychrotrophic bacterium Pseudomonas sp. PAMC 28620 was found to produce a distinctive medium-chain-length polyhydroxyalkanoates (MCL-PHAs) copolymer when grown on structurally unrelated carbon sources including glycerol. The maximum MCL-PHAs copolymer yield was obtained about 52.18±4.12% from 7.95±0.66g/L of biomass at 144h of fermentation when 3% glycerol was used as sole carbon and energy source during the laboratory-scale bioreactor process. Characterization of the copolymer was carried out using fourier transform infrared spectroscopy (FTIR), gas chromatography-mass spectrometry (GC-MS), proton ((1)H) and carbon ((13)C) nuclear magnetic resonance spectroscopy (NMR), gel permeation chromatography (GPC), differential scanning calorimeter (DSC) and thermo-gravimetric analysis (TGA)...
January 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28107982/quantification-of-real-thermal-catalytic-and-hydrodeoxygenated-bio-oils-via-comprehensive-two-dimensional-gas-chromatography-with-mass-spectrometry
#3
Raquel V S Silva, Nathalia S Tessarolo, Vinícius B Pereira, Vitor L Ximenes, Fábio L Mendes, Marlon B B de Almeida, Débora A Azevedo
The elucidation of bio-oil composition is important to evaluate the processes of biomass conversion and its upgrading, and to suggest the proper use for each sample. Comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry (GC×GC-TOFMS) is a widely applied analytical approach for bio-oil investigation due to the higher separation and resolution capacity from this technique. This work addresses the issue of analytical performance to assess the comprehensive characterization of real bio-oil samples via GC×GC-TOFMS...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107741/building-related-symptoms-are-linked-to-the-in-vitro-toxicity-of-indoor-dust-and-airborne-microbial-propagules-in-schools-a-cross-sectional-study
#4
J T Salin, M Salkinoja-Salonen, P J Salin, K Nelo, T Holma, P Ohtonen, H Syrjälä
INTRODUCTION: Indoor microbial toxicity is suspected to cause some building-related symptoms, but supporting epidemiological data are lacking. OBJECTIVE: We examined whether the in vitro toxicity of indoor samples from school buildings was associated with work-related health symptoms (building-related symptoms, BRS). METHODS: Administrators of the Helsinki City Real Estate Department selected 15 schools for the study, and a questionnaire on symptoms connected to work was sent to the teachers in the selected schools for voluntary completion...
January 17, 2017: Environmental Research
https://www.readbyqxmd.com/read/28107733/glycine-increases-cold-tolerance-in-rice-via-the-regulation-of-n-uptake-physiological-characteristics-and-photosynthesis
#5
Cao Xiaochuang, Zhong Chu, Zhu Lianfeng, Zhang Junhua, Sajid Hussain, Wu Lianghuan, Jin Qianyu
To investigate the response of rice growth and photosynthesis to different nitrogen (N) sources under cold stress, hydroponic cultivation of rice was done in greenhouse, with glycine, ammonium, and nitrate as the sole N sources. The results demonstrate that exposure to low temperature reduced the rice biomass and leaf chlorophyll content, but their values in the glycine-treated plants were significantly higher than in the ammonium- and nitrate-treated plants. This might be attributed to the higher N uptake rate and root area and activity in the glycine-treated plants...
January 12, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28107732/comparative-analysis-of-polyamine-metabolism-in-wheat-and-maize-plants
#6
Gabriella Szalai, Katalin Janda, Éva Darkó, Tibor Janda, Violeta Peeva, Magda Pál
In the present work changes in polyamine contents were investigated after various hydroponic polyamine treatments (putrescine, spermidine and spermine at 0.1, 0.3 and 0.5 mM concentrations) in two different crop species, wheat and maize. In contrast to putrescine, higher polyamines (spermidine and spermine) induced concentration-dependent oxidative damage in both crops, resulting in decreased biomass. The unfavourable effects of polyamines were more pronounced in the roots, and maize was more sensitive than wheat...
January 12, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28107731/natural-amelioration-of-zinc-oxide-nanoparticle-toxicity-in-fenugreek%C3%A2-trigonella-foenum-gracum-by-arbuscular-mycorrhizal-glomus-intraradices-secretion-of-glomalin
#7
Narges Ghasemi Siani, Seyfollah Fallah, Lok Raj Pokhrel, Ali Rostamnejadi
Owing to rising production and use of engineered nanoparticles (ENPs) in the myriad of consumer applications, ENPs are being released into the environment where their potential fate and effects have remained unclear. With naturally occurring arbuscular mycorrhizal fungus (AMF; Glomus intraradices) in soils, their influence (positive or negative) on ENPs toxicity in plants is not well documented. Herein, we investigated potential influence of AMF on the growth and development in fenugreek (Trigonella foenum-graecum) under varied Zinc oxide nanoparticles (ZnONPs) treatments (0, 125, 250, 375 and 500 μg g(-1))...
January 3, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28107721/increased-biohydrogen-yields-volatile-fatty-acid-production-and-substrate-utilisation-rates-via-the-electrodialysis-of-a-continually-fed-sucrose-fermenter
#8
Rhys Jon Jones, Jaime Massanet-Nicolau, Martijn J J Mulder, Giuliano Premier, Richard Dinsdale, Alan Guwy
Electrodialysis (ED) removed volatile fatty acids (VFAs) from a continually-fed, hydrogen-producing fermenter. Simultaneously, electrochemical removal and adsorption removed gaseous H2 and CO2, respectively. Removing VFAs via ED in this novel process increased H2 yields by a factor of 3.75 from 0.24molH2mol(-1)hexose to 0.90molH2mol(-1)hexose. VFA production and substrate utilisation rates were consistent with the hypothesis that end product inhibition arrests H2 production. The methodology facilitated the recovery of 37g of VFAs, and 30L H2 that was more than 99% pure, both of which are valuable, energy dense chemicals...
January 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28107609/carbon-nanodot-solar-cells-from-renewable-precursors
#9
Maria-Magdalena Titirici, Adam Marinovic, Steve Dunn, Lim Swee Kiat, Joe Briscoe
It has recently been shown that waste biomass can be converted into a wide range of functional materials, including those with desirable optical and electronic properties, offering the opportunity to find new uses for these renewable resources. Photovoltaics is one area where finding the combination of abundant, low-cost and non-toxic materials with the necessary functionality can be challenging. In this paper we compare the performance of carbon nanodots derived from a wide range of biomaterials obtained from different biomass sources as sensitizers for TiO2-based nanostructured solar cells; polysaccharides (chitosan and chitin), monosaccharide (D-glucose), amino acids (L-arginine and L-cysteine) and raw lobster shells are all used to produce carbon nanodots via hydrothermal carbonisation...
January 20, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28107051/the-size-dependence-of-phytoplankton-growth-rates-a-trade-off-between-nutrient-uptake-and-metabolism
#10
Ben A Ward, Emilio Marañón, Boris Sauterey, Jonathan Rault, David Claessen
Rates of metabolism and population growth are often assumed to decrease universally with increasing organism size. Recent observations have shown, however, that maximum population growth rates among phytoplankton smaller than ∼6 μm in diameter tend to increase with organism size. Here we bring together observations and theory to demonstrate that the observed change in slope is attributable to a trade-off between nutrient uptake and the potential rate of internal metabolism. Specifically, we apply an established model of phytoplankton growth to explore a trade-off between the ability of cells to replenish their internal quota (which increases with size) and their ability to synthesize new biomass (which decreases with size)...
February 2017: American Naturalist
https://www.readbyqxmd.com/read/28106848/a-new-strategy-for-heavy-metal-polluted-environments-a-review-of-microbial-biosorbents
#11
REVIEW
Ayansina Segun Ayangbenro, Olubukola Oluranti Babalola
Persistent heavy metal pollution poses a major threat to all life forms in the environment due to its toxic effects. These metals are very reactive at low concentrations and can accumulate in the food web, causing severe public health concerns. Remediation using conventional physical and chemical methods is uneconomical and generates large volumes of chemical waste. Bioremediation of hazardous metals has received considerable and growing interest over the years. The use of microbial biosorbents is eco-friendly and cost effective; hence, it is an efficient alternative for the remediation of heavy metal contaminated environments...
January 19, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28106819/modeling-aboveground-biomass-in-hulunber-grassland-ecosystem-by-using-unmanned-aerial-vehicle-discrete-lidar
#12
Dongliang Wang, Xiaoping Xin, Quanqin Shao, Matthew Brolly, Zhiliang Zhu, Jin Chen
Accurate canopy structure datasets, including canopy height and fractional cover, are required to monitor aboveground biomass as well as to provide validation data for satellite remote sensing products. In this study, the ability of an unmanned aerial vehicle (UAV) discrete light detection and ranging (lidar) was investigated for modeling both the canopy height and fractional cover in Hulunber grassland ecosystem. The extracted mean canopy height, maximum canopy height, and fractional cover were used to estimate the aboveground biomass...
January 19, 2017: Sensors
https://www.readbyqxmd.com/read/28106795/bio-based-aromatic-epoxy-monomers-for-thermoset-materials
#13
REVIEW
Feifei Ng, Guillaume Couture, Coralie Philippe, Bernard Boutevin, Sylvain Caillol
The synthesis of polymers from renewable resources is a burning issue that is actively investigated. Polyepoxide networks constitute a major class of thermosetting polymers and are extensively used as coatings, electronic materials, adhesives. Owing to their outstanding mechanical and electrical properties, chemical resistance, adhesion, and minimal shrinkage after curing, they are used in structural applications as well. Most of these thermosets are industrially manufactured from bisphenol A (BPA), a substance that was initially synthesized as a chemical estrogen...
January 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28106742/mechanochemical-lignin-mediated-strecker-reaction
#14
Saumya Dabral, Mathias Turberg, Andrea Wanninger, Carsten Bolm, José G Hernández
A mechanochemical Strecker reaction involving a wide range of aldehydes (aromatic, heteroaromatic and aliphatic), amines, and KCN afforded a library of α-aminonitriles upon mechanical activation. This multicomponent process was efficiently activated by lignocellulosic biomass as additives. Particularly, commercially available Kraft lignin was found to be the best activator for the addition of cyanide to the in situ formed imines. A comparative study of the (31)P-NMR (Nuclear Magnetic Resonance) along with IR (Infrared) data analysis for the Kraft lignin and methylated Kraft lignin samples ascertained the importance of the free hydroxyl groups in the activation of the mechanochemical reaction...
January 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28106309/transposable-elements-tes-contribute-to-stress-related-long-intergenic-noncoding-rnas-in-plants
#15
Dong Wang, Zhipeng Qu, Lan Yang, Qingzhu Zhang, Zhi-Hong Liu, Trung Do, David L Adelson, Zhen-Yu Wang, Iain Searle, Jian-Kang Zhu
Noncoding RNAs have been extensively described in plant and animal transcriptomes by using high-throughput sequencing technology. Of these non-coding RNAs, a growing number of long intergenic noncoding RNAs (lincRNAs) have been described in multicellular organisms, however the origins and functions of many lincRNAs remain to be explored. In many eukaryotic genomes, transposable elements (TEs) are widely distributed and often account for large fractions of plant and animal genomes yet the contribution of TEs to lincRNAs is largely unknown...
January 20, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28106248/bacterial-impregnation-of-mineral-fertilizers-improves-yield-and-nutrient-use-efficiency-of-wheat
#16
Shakeel Ahmad, Muhammad Imran, Sabir Hussain, Sajid Mahmood, Azhar Hussain, Muhammad Hasnain
BACKGROUND: The fertilizer use efficiency (FUE) of agricultural crops is generally low which results in poor crop yields and low economic benefits to the farmers. Among the various approaches used to enhance FUE, impregnation of mineral fertilizers with plant growth promoting bacteria (PGPB) is attracting a worldwide attention. The present study was aimed to improve growth, yield and nutrient use efficiency of wheat by bacterially impregnated mineral fertilizers. RESULTS: Results of the pot study revealed that impregnation of diammonium phosphate (DAP) and urea with PGPB was helpful in enhancing the growth, yield, photosynthetic rate, nitrogen use efficiency (NUE) and phosphorus use efficiency (PUE) of wheat...
January 20, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28106043/humans-rather-than-climate-the-primary-cause-of-pleistocene-megafaunal-extinction-in-australia
#17
Sander van der Kaars, Gifford H Miller, Chris S M Turney, Ellyn J Cook, Dirk Nürnberg, Joachim Schönfeld, A Peter Kershaw, Scott J Lehman
Environmental histories that span the last full glacial cycle and are representative of regional change in Australia are scarce, hampering assessment of environmental change preceding and concurrent with human dispersal on the continent ca. 47,000 years ago. Here we present a continuous 150,000-year record offshore south-western Australia and identify the timing of two critical late Pleistocene events: wide-scale ecosystem change and regional megafaunal population collapse. We establish that substantial changes in vegetation and fire regime occurred ∼70,000 years ago under a climate much drier than today...
January 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28105522/response-of-aboveground-carbon-balance-to-long-term-experimental-enhancements-in-precipitation-seasonality-is-contingent-on-plant-community-type-in-cold-desert-rangelands
#18
Kathryn McAbee, Keith Reinhardt, Matthew J Germino, Andrew Bosworth
Semi-arid rangelands are important carbon (C) pools at global scales. However, the degree of net C storage or release in water-limited systems is a function of precipitation amount and timing, as well as plant community composition. In northern latitudes of western North America, C storage in cold-desert ecosystems could increase with boosts in wintertime precipitation, in which climate models predict, due to increases in wintertime soil water storage that enhance summertime productivity. However, there are few long-term, manipulative field-based studies investigating how rangelands will respond to altered precipitation amount or timing...
January 20, 2017: Oecologia
https://www.readbyqxmd.com/read/28105402/multishelled-ni-rich-li-ni-x-co-y-mn-z-o2-hollow-fibers-with-low-cation-mixing-as-high-performance-cathode-materials-for-li-ion-batteries
#19
Yihui Zou, Xianfeng Yang, Chunxiao Lv, Tongchao Liu, Yanzhi Xia, Lu Shang, Geoffrey I N Waterhouse, Dongjiang Yang, Tierui Zhang
A simple seaweed biomass conversion strategy is proposed to synthesize highly porous multishelled Ni-rich Li(Ni x Co y Mn z )O2 hollow fibers with very low cation mixing. The low cation mixing results from the cation confinement by the novel "egg-box" structure in the alginate template. These hollow fibers exhibit remarkable energy density, high-rate capacity, and long-term cycling stability when used as cathode material for Li-ion batteries.
January 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28104792/new-insight-into-chondroitin-and-heparosan-like-capsular-polysaccharide-synthesis-by-profiling-of-the-nucleotide-sugar-precursors
#20
Odile Francesca Restaino, Irene di Lauro, Rosaria Di Nuzzo, Mario De Rosa, Chiara Schiraldi
Escherichia coli K4 and K5 capsular polysaccharides have been used as starting material for the biotechnological production of chondroitin sulfate and heparin, respectively. The capsular polysaccharide covers the outer cell wall but in late exponential or stationary growth phase it is started to be released in the surrounding medium. The released capsular polysaccharide concentration was used, so far, as the only marker to connect the strain production ability to the different cultivation conditions employed...
January 19, 2017: Bioscience Reports
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