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https://www.readbyqxmd.com/read/29216498/transcriptional-responses-to-phosphate-starvation-in-brachypodium-distachyon-roots
#1
Pengshan Zhao, Lirong Wang, Hengxia Yin
Brachypodium distachyon is a model plant that has recently emerged in grass research. Although the growth and photochemical efficiency of this species respond strongly to phosphate (Pi) availability, its Pi starvation response mechanism, which controls the Pi homeostasis, remains largely unknown. This study presents the transcriptomic response profiles of Pi-deficient roots at growth stages during which the plants were starved but obvious growth defects were absent. The results identify several phosphate transporters (i...
November 21, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29216370/the-role-of-arabidopsis-inositol-polyphosphate-kinase-atipk2%C3%AE-in-glucose-suppression-of-seed-germination-and-seedling-development
#2
Qiaofeng Yang, Sihong Sang, Yao Chen, Zhaoyun Wei, Peng Wang
Seed germination and subsequent seedling development are critical phases in plant. These processes are regulated by a complex molecular network in which sugar has been reported to play an essential role. However, factors affecting sugar responses remain to be fully elucidated. In this study, we demonstrate that AtIPK2β, known to participate in the synthesis of myo-inositol 1,2,3,4,5,6-hexakisphosphate (IP6, phytate), affects Arabidopsis responses to glucose during seed germination. Loss-of-function mutant atipk2β showed increased sensitivity to 6% glucose and paclobutrazol (PAC)...
December 4, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29215558/synthesis-of-benzyl-acetate-catalyzed-by-lipase-immobilized-in-nontoxic-chitosan-polyphosphate-beads
#3
Ana D Q Melo, Francisco F M Silva, José C S Dos Santos, Roberto Fernández-Lafuente, Telma L G Lemos, Francisco A Dias Filho
Enzymes serve as biocatalysts for innumerable important reactions, however, their application has limitations, which can in many cases be overcome by using appropriate immobilization strategies. Here, a new support for immobilizing enzymes is proposed. This hybrid organic-inorganic support is composed of chitosan-a natural, nontoxic, biodegradable, and edible biopolymer-and sodium polyphosphate as the inorganic component. Lipase B from Candida antarctica (CALB) was immobilized on microspheres by encapsulation using these polymers...
December 7, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29207303/the-fate-of-cyanuric-acid-in-biological-wastewater-treatment-system-and-its-impact-on-biological-nutrient-removal
#4
Hongxue An, Jian Liu, Xiaoming Li, Qi Yang, Dongbo Wang, Ting Xie, Jianwei Zhao, Qiuxiang Xu, Fei Chen, Yali Wang, Kaixin Yi, Jian Sun, Ziletao Tao, Guangming Zeng
Cyanuric acid (CA) is widely used in living and production. It is a kind of environmental priority pollutants which exists chronically in soil and water, but is difficult to be chemically hydrolyzed or oxidized. The behavior of CA at different levels of 0, 0.01, 0.10 and 1.00 mg L-1 in biological wastewater treatment process was investigated in this paper. Experimental results showed that CA (0.01 and 0.10 mg L-1) was removed in biological wastewater treatment process, which was mainly achieved by biodegradation of particular species (Acidovorax and Pseudomonas) in the anaerobic condition...
December 2, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29197958/immunohaemostasis-a-new-view-on-haemostasis-during-sepsis
#5
REVIEW
Xavier Delabranche, Julie Helms, Ferhat Meziani
Host infection by a micro-organism triggers systemic inflammation, innate immunity and complement pathways, but also haemostasis activation. The role of thrombin and fibrin generation in host defence is now recognised, and thrombin has become a partner for survival, while it was seen only as one of the "principal suspects" of multiple organ failure and death during septic shock. This review is first focused on pathophysiology. The role of contact activation system, polyphosphates and neutrophil extracellular traps has emerged, offering new potential therapeutic targets...
December 2, 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/29192218/magnesium-uptake-by-connecting-fluid-phase-endocytosis-to-an-intracellular-inorganic-cation-filter
#6
Sandra H Klompmaker, Kid Kohl, Nicolas Fasel, Andreas Mayer
Cells acquire free metals through plasma membrane transporters. But, in natural settings, sequestering agents often render metals inaccessible to transporters, limiting metal bioavailability. Here we identify a pathway for metal acquisition, allowing cells to cope with this situation. Under limited bioavailability of Mg2+, yeast cells upregulate fluid-phase endocytosis and transfer solutes from the environment into their vacuole, an acidocalcisome-like compartment loaded with highly concentrated polyphosphate...
December 1, 2017: Nature Communications
https://www.readbyqxmd.com/read/29190581/melamine-containing-polyphosphazene-wrapped-ammonium-polyphosphate-a-novel-multifunctional-organic-inorganic-hybrid-flame-retardant
#7
Shuilai Qiu, Chao Ma, Xin Wang, Xia Zhou, Xiaming Feng, Richard K K Yuen, Yuan Hu
To achieve superior fire safety epoxy resins (EP), a novel multifunctional organic-inorganic hybrid, melamine-containing polyphosphazene wrapped ammonium polyphosphate (PZMA@APP) with rich amino groups was prepared and used as an efficient flame retardant. Thanks to the cross-linked polyphosphazene part, PZMA@APP exhibited high flame retardant efficiency and smoke suppression to the EP composites. Thermogravimetric analysis indicated that PZMA@APP significantly enhanced the thermal stability of EP composites...
November 20, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29190088/highly-effective-polyphosphate-synthesis-phosphate-removal-and-concentration-using-engineered-environmental-bacteria-based-on-a-simple-solo-medium-copy-plasmid-strategy
#8
Xin Wang, Xiaomeng Wang, Kaimin Hui, Wei Wei, Wen Zhang, Ai-Jun Miao, Lin Xiao, Liuyan Yang
Microbial polyphosphate (polyP) production is vital to phosphate removal from wastewater. However, to date, the engineered polyP synthesis using genetically accessible environmental bacteria remains a challenge. This study develops a simple solo medium-copy plasmid based polyphosphate kinase (PPK1) overexpression strategy for achieving maximum intracellular polyphosphate accumulation by environmental bacteria. The polyP content of the subsequently engineered Citrobacter freundii (CPP) could reach as high as 12...
November 30, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29189724/effects-of-trimetaphosphate-on-abiotic-formation-and-hydrolysis-of-peptides
#9
Izabela K Sibilska, Bingming Chen, Lingjun Li, John Yin
The primordial Earth probably had most of the factors needed for the emergence and development of life. It is believed that it had not only water, but also simple inorganic and organic materials. While studies since the 1950s on the origins of organic matter have established key roles for amino acids, conditions that would have promoted their condensation to make polymers, such as peptides or proteins, have yet to be fully defined. The condensation of amino acids in a water-rich environment is not thermodynamically favored...
November 30, 2017: Life
https://www.readbyqxmd.com/read/29166994/biological-phosphorus-recovery-review-of-current-progress-and-future-needs
#10
Yu Yang, Xu Shi, Wendy Ballent, Brooke K Mayer
  This review summarizes the main species of polyphosphate accumulating organisms (PAOs) and algae, illustrates their pathways and key enzymes, discusses biological phosphorous (P) recovery from dilute waters, and identifies research avenues to encourage adoption and implementation. Phylogenic analysis indicates that the Proteobacteria phylum plays an important role in enhanced biological phosphorus removal (EBPR). The use of meta-transcriptome analysis and single cell-based techniques to help overcome the challenges associated with non-PAO competition was discussed...
December 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29164506/enzymatic-production-of-glutathione-coupling-with-an-atp-regeneration-system-based-on-polyphosphate-kinase
#11
Hao Cao, Chengcheng Li, Jing Zhao, Fang Wang, Tianwei Tan, Luo Liu
Glutathione (GSH) is an important reducing agent in the living cells. It is synthesized by a two-step reaction and requires two molecules of adenosine triphosphate (ATP) for one molecule GSH. The enzymatic cascade reaction in vitro is a promising approach to achieve a high titer and limit side reactions; although, a cost-effective phosphate donor for ATP regeneration is required. Triphosphate (PolyP(3)), tetraphosphate (PolyP(4)), and hexametaphosphate (PolyP(6)) were investigated in this study. Triphosphate inhibited the bifunctional GSH synthetase (GshF) from Streptococcus agalactiae, while no significant inhibition was observed by adding hexametaphosphate...
November 21, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/29161428/arabidopsis-inositol-polyphosphate-multikinase-delays-flowering-time-through-mediating-transcriptional-activation-of-flowering-locus-c
#12
Sihong Sang, Yao Chen, Qiaofeng Yang, Peng Wang
Timely flowering is critical for successful reproduction and seed yield in plants. A diverse range of regulators have been found to control flowering time in response to environmental and endogenous signals. Among these regulators, FLOWERING LOCUS C (FLC) acts as a central repressor of floral transition by blocking the expression of flowering integrator genes. Here, we report that Arabidopsis inositol polyphosphate multikinase (AtIPK2β) functions in flowering time control by mediating transcriptional regulation of FLC at the chromatin level...
November 17, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29159895/proliferation-and-differentiation-of-mesenchymal-stem-cells-on-scaffolds-containing-chitosan-calcium-polyphosphate-and-pigeonite-for-bone-tissue-engineering
#13
S Dhivya, A Keshav Narayan, R Logith Kumar, S Viji Chandran, M Vairamani, N Selvamurugan
OBJECTIVES: Treatment of critical-sized bone defects with cells and biomaterials offers an efficient alternative to traditional bone grafts. Chitosan (CS) is a natural biopolymer that acts as a scaffold in bone tissue engineering (BTE). Polyphosphate (PolyP), recently identified as an inorganic polymer, acts as a potential bone morphogenetic material, whereas pigeonite (Pg) is a novel iron-containing ceramic. In this study, we prepared and characterized scaffolds containing CS, calcium polyphosphate (CaPP) and Pg particles for bone formation in vitro and in vivo...
November 21, 2017: Cell Proliferation
https://www.readbyqxmd.com/read/29158361/prochemerin-cleavage-by-factor-xia-links-coagulation-and-inflammation
#14
Xiaomei Ge, Yasuto Yamaguchi, Lei Zhao, Loredana Bury, Paolo Gresele, Caroline Berube, Lawrence L Leung, John Morser
Chemerin is a chemoattractant and adipokine that circulates in blood as inactive prochemerin (chem163S). Chem163S is activated by a series of C-terminal proteolytic cleavages resulting in diverse chemerin forms with different levels of activity. We screened a panel of proteases in the coagulation, fibrinolytic and inflammatory cascades to identify those that process prochemerin in plasma. Factor XIa (FXIa) cleaved chem163S, generating a novel chemerin form, chem162R, as an intermediate product, and chem158K, as the final product...
November 20, 2017: Blood
https://www.readbyqxmd.com/read/29158241/polyphosphate-kinase-antagonizes-virulence-gene-expression-in-francisella-tularensis
#15
Amy E Rohlfing, Kathryn M Ramsey, Simon L Dove
The alarmone ppGpp is a critical regulator of virulence gene expression in Francisella tularensis In this intracellular pathogen ppGpp is thought to work in concert with the putative DNA-binding protein PigR and the SspA protein family members MglA and SspA to control a common set of genes. MglA and SspA form a complex that interacts with RNA polymerase (RNAP) and PigR functions by interacting with the RNAP-associated MglA-SspA complex. Prior work suggested that ppGpp exerts its regulatory effects in F. tularensis indirectly by promoting the accumulation of polyphosphate in the cell, which in turn was required for formation of the MglA-SspA complex...
November 20, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/29151887/an-accurate-description-of-aspergillus-niger-organic-acid-batch-fermentation-through-dynamic-metabolic-modelling
#16
Daniel J Upton, Simon J McQueen-Mason, A Jamie Wood
Background: Aspergillus niger fermentation has provided the chief source of industrial citric acid for over 50 years. Traditional strain development of this organism was achieved through random mutagenesis, but advances in genomics have enabled the development of genome-scale metabolic modelling that can be used to make predictive improvements in fermentation performance. The parent citric acid-producing strain of A. niger, ATCC 1015, has been described previously by a genome-scale metabolic model that encapsulates its response to ambient pH...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/29149674/the-impact-of-operational-strategies-on-the-performance-of-a-photo-ebpr-system
#17
V C F Carvalho, E B Freitas, P J Silva, J C Fradinho, M A M Reis, A Oehmen
A novel Phototrophic - Enhanced Biological Phosphorus Removal (Photo-EBPR) system, consisting of a consortium of photosynthetic organisms and polyphosphate accumulating organisms (PAOs), was studied in this work. A sequencing batch reactor was fed with a mixture of acetate and propionate (75%-25%) and subjected to dark/light cycles in order to select a photo-EBPR system containing PAOs and photosynthetic organisms, the latter likely providers of oxygen to the system. The results from the selection period (stage 1) showed that the photo-EBPR culture was capable of performing P release in the dark and P uptake in the presence of light, under limited oxygen concentrations...
November 4, 2017: Water Research
https://www.readbyqxmd.com/read/29143792/polyphosphates-as-inhibitors-for-poly-vinyl-chloride-photodegradation
#18
Dina S Ahmed, Gamal A El-Hiti, Emad Yousif, Ayad S Hameed
Three polyphosphates were used as inhibitors for poly(vinyl chloride) (PVC) photodegradation. The polyphosphates were added to PVC at a concentration of 0.5% by weight. The PVC films (40 µm thickness) were irradiated at room temperature with ultraviolet (UV) light for up to 300 h. The changes in PVC films after irradiation were monitored by Fourier transform infrared spectroscopy, weight loss, viscosity-average molecular weight determination, and atomic force microscopy. These changes were very noticeable in the blank PVC films compared to the ones obtained when additives were used...
October 28, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29140789/mechanism-and-dynamics-of-inpp5e-transport-into-and-inside-the-ciliary-compartment
#19
Stefanie Kristine Kösling, Eyad Kalawy Fansa, Stefano Maffini, Alfred Wittinghofer
The inositol polyphosphate 5´-phosphatase E (INPP5E) localizes to cilia. We showed that the carrier protein phosphodiesterase 6 delta subunit (PDE6δ) mediates the sorting of farnesylated INPP5E into cilia due to high affinity binding and release by Arl3 GTP. However, the dynamics of INPP5E transport into and inside the ciliary compartment are not fully understood. Here we first investigate the movement of INPP5E using live cell fluorescence microscopy and fluorescence recovery after photobleaching (FRAP) analysis...
August 28, 2017: Biological Chemistry
https://www.readbyqxmd.com/read/29130402/assessing-the-performance-and-microbial-community-of-hybrid-moving-bed-and-conventional-membrane-bioreactors-treating-municipal-wastewater
#20
R E Costa, A A Battistelli, J K B Bernardelli, J P Bassin, T J Belli, F R Lapolli
A conventional (SB-CMBR) and a hybrid moving bed (SB-HMBR) sequencing batch membrane bioreactor treating municipal wastewater were compared during their start-up in terms of organic matter and nutrient removal, membrane fouling characteristics and microbial community. Both systems exhibited similar COD, ammonium, total nitrogen (TN) and phosphorus removal efficiency, amounting up to 96%, 99%, 70% and 85%, respectively. Most of the COD removal was coupled to phosphate release and denitrification in the anaerobic/anoxic phase of the operating cycle, whereas the low COD/N environment established in the aerated phase allowed full nitrification...
November 11, 2017: Environmental Technology
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