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https://www.readbyqxmd.com/read/27933084/photosystem-ii-functionality-in-barley-responds-dynamically-to-changes-in-leaf-manganese-status
#1
Sidsel B Schmidt, Marta Powikrowska, Ken S Krogholm, Bianca Naumann-Busch, Jan K Schjoerring, Søren Husted, Poul E Jensen, Pai R Pedas
A catalytic manganese (Mn) cluster is required for the oxidation of water in the oxygen-evolving complex (OEC) of photosystem II (PSII) in plants. Despite this essential role of Mn in generating the electrons driving photosynthesis, limited information is available on how Mn deficiency affects PSII functionality. We have here used parameters derived from measurements of fluorescence induction kinetics (OJIP transients), non-photochemical quenching (NPQ) and PSII subunit composition to investigate how latent Mn deficiency changes the photochemistry in two barley genotypes differing in Mn efficiency...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27933041/production-characterization-and-application-of-bacillus-licheniformis-w16-biosurfactant-in-enhancing-oil-recovery
#2
Sanket J Joshi, Yahya M Al-Wahaibi, Saif N Al-Bahry, Abdulkadir E Elshafie, Ali S Al-Bemani, Asma Al-Bahri, Musallam S Al-Mandhari
The biosurfactant production by Bacillus licheniformis W16 and evaluation of biosurfactant based enhanced oil recovery (EOR) using core-flood under reservoir conditions were investigated. Previously reported nine different production media were screened for biosurfactant production, and two were further optimized with different carbon sources (glucose, sucrose, starch, cane molasses, or date molasses), as well as the strain was screened for biosurfactant production during the growth in different media. The biosurfactant reduced the surface tension and interfacial tension to 24...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27931767/blood-and-urinary-levels-of-metals-and-metalloids-in-the-general-adult-population-of-northern-france-the-imepoge-study-2008-2010
#3
Catherine Nisse, Romuald Tagne-Fotso, Mike Howsam, Camille Richeval, Laurence Labat, Ariane Leroyer
BACKGROUND: The assessment of human chemical risks related to occupational or environmental exposure to pollutants requires the use of both accurate exposure indicators and reference values. The objective of this study was to evaluate the blood and urinary levels of various metals and metalloids in a sample of adults aged 20-59 years of the general population of Northern France, a formerly heavily industrialised area that retains some industrial activity. METHODS: A cross-sectional study was conducted between 2008 and 2010, enrolling 2000 residents of Northern France...
October 3, 2016: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/27930968/transformation-and-bioaccessibility-of-lead-induced-by-steamed-bread-feed-in-the-gastrointestinal-tract
#4
Junhong Kan, Jingke Sima, Xinde Cao
Accidental ingestion of contaminated soil has been recognized as an important pathway of human exposure to lead (Pb), especially for children through hand-to-mouth activities. Intake of food following the soil ingestion may affect the bioaccessibility of Pb in the gastrointestinal tract. In this study, the effect of steamed bread on the transformation and subsequent bioaccessibility of Pb in two soils was determined by the physiologically based extraction test (PBET). Two compounds, Pb(NO3)2 and PbCO3, were included in the evaluation for comparison...
December 5, 2016: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/27930468/the-appropriative-retractors-for-genioplasty
#5
Mingcan Zhao, Guomin Wu
Mental nerve (MN) injury is the most common complications of genioplasty; to protect the MN and oral mucosa, the authors invent and validate the appropriative retractors for genioplasty, and which can avoid the skin and mucous membrane of the lower lip, chin, and the vestibular gingiva of the mandibular incisor from paresthesia or dysesthesia. The patent application for the appropriative retractors for genioplasty is already submitted (Patent No 201610164563.3, China). The retractors provide a better surgical visual field and improve the operation efficiency while reducing the risk of surgery...
December 7, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27930389/therapy-related-myeloid-neoplasms
#6
Arnold Ganser, Michael Heuser
PURPOSE OF REVIEW: Advances in the genetic characterization of patients with therapy-related myeloid neoplasms (t-MNs) have changed our understanding of the pathogenesis of these diseases. In addition, extensive sequencing studies have identified recurrent mutations with diagnostic and prognostic impact. Thus, the revised version of the WHO classification combines therapy-related myelodysplastic syndromes (t-MDS) and therapy-related acute myeloid leukemia (t-AML) in the one entity of t-MNs because of their similar pathogenesis, rapid progression from t-MDS to t-AML, and their equally poor prognosis...
December 7, 2016: Current Opinion in Hematology
https://www.readbyqxmd.com/read/27930312/metal-dependence-and-branched-rna-cocrystal-structures-of-the-rna-lariat-debranching-enzyme-dbr1
#7
Nathaniel E Clark, Adam Katolik, Kenneth M Roberts, Alexander B Taylor, Stephen P Holloway, Jonathan P Schuermann, Eric J Montemayor, Scott W Stevens, Paul F Fitzpatrick, Masad J Damha, P John Hart
Intron lariats are circular, branched RNAs (bRNAs) produced during pre-mRNA splicing. Their unusual chemical and topological properties arise from branch-point nucleotides harboring vicinal 2',5'- and 3',5'-phosphodiester linkages. The 2',5'-bonds must be hydrolyzed by the RNA debranching enzyme Dbr1 before spliced introns can be degraded or processed into small nucleolar RNA and microRNA derived from intronic RNA. Here, we measure the activity of Dbr1 from Entamoeba histolytica by using a synthetic, dark-quenched bRNA substrate that fluoresces upon hydrolysis...
December 6, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27930290/gamma-motor-neurons-survive-and-exacerbate-alpha-motor-neuron-degeneration-in-als
#8
Melanie Lalancette-Hebert, Aarti Sharma, Alexander K Lyashchenko, Neil A Shneider
The molecular and cellular basis of selective motor neuron (MN) vulnerability in amyotrophic lateral sclerosis (ALS) is not known. In genetically distinct mouse models of familial ALS expressing mutant superoxide dismutase-1 (SOD1), TAR DNA-binding protein 43 (TDP-43), and fused in sarcoma (FUS), we demonstrate selective degeneration of alpha MNs (α-MNs) and complete sparing of gamma MNs (γ-MNs), which selectively innervate muscle spindles. Resistant γ-MNs are distinct from vulnerable α-MNs in that they lack synaptic contacts from primary afferent (IA) fibers...
December 7, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27929104/microneedles-with-controlled-bubble-sizes-and-drug-distributions-for-efficient-transdermal-drug-delivery
#9
Qi Lei Wang, Dan Dan Zhu, Xu Bo Liu, Bo Zhi Chen, Xin Dong Guo
Drug loaded dissolving microneedles (DMNs) fabricated with water soluble polymers have received increasing attentions as a safe and efficient transdermal drug delivery system. Usually, to reach a high drug delivery efficiency, an ideal drug distribution is gathering more drugs in the tip or the top part of DMNs. In this work, we introduce an easy and new method to introduce a bubble with controlled size into the body of DMNs. The introduction of bubbles can prevent the drug diffusion into the whole body of the MNs...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27929083/applicability-of-drinking-water-treatment-residue-for-lake-restoration-in-relation-to-metal-metalloid-risk-assessment
#10
Nannan Yuan, Changhui Wang, Yuansheng Pei, Helong Jiang
Drinking water treatment residue (DWTR), a byproduct generated during potable water production, exhibits a high potential for recycling to control eutrophication. However, this beneficial recycling is hampered by unclear metal/metalloid pollution risks related to DWTR. In this study, the pollution risks of Al, As, Ba, Be, Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb, and Zn due to DWTR application were first evaluated for lake water based on human health risk assessment models and comparison of regulatory standards. The risks of DWTR were also evaluated for sediments on the basis of toxicity characteristics leaching procedure and fractionation in relation to risk assessment code...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27928992/superspin-glass-state-in-a-diluted-nanoparticle-system-stabilized-by-interparticle-interactions-mediated-by-an-antiferromagnetic-matrix
#11
G Margaris, M Vasilakaki, D Peddis, K N Trohidou, S Laureti, C Binns, E Agostinelli, D Rinaldi, R Mathieu, D Fiorani
In nanoparticle systems consisting of two magnetic materials (bi-magnetic nanoparticles or nanoparticles embedded in a magnetic matrix), there is a constantly growing interest in the investigation of the interplay between interparticle interactions and the nanoparticle-matrix interface exchange coupling, because of its enormous impact on a number of technological applications. The understanding of the mechanisms of such interplay is a great challenge, as it would allow controlling equilibrium and non-equilibrium magnetization dynamics of exchange coupled nanoparticles systems and finely tuning their anisotropy...
December 8, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27928781/mechanism-of-fluorescence-enhancement-of-biosynthesized-xfe2o4-bifeo3-x-cr-mn-co-or-ni-membranes
#12
Liang Bian, Hai-Long Li, Hai-Liang Dong, Fa-Qin Dong, Mian-Xin Song, Li-Sheng Wang, Wen-Ping Hou, Lei Gao, Xiao-Yan Zhang, Tian-Liang Zhou, Guang-Ai Sun, Xin-Xi Li, Lei Xie
Ferrites-bismuth ferrite is an intriguing option for medical diagnostic imaging device due to its magnetoelectric and enhanced near-infrared fluorescent properties. However, the embedded XFO nanoparticles are randomly located on the BFO membranes, making implementation in devices difficult. To overcome this, we present a facile bio-approach to produce XFe2O4-BiFeO3 (XFO-BFO) (X = Cr, Mn, Co, or Ni) membranes using Shewanella oneidensis MR-1. The perovskite BFO enhances the fluorescence intensity (at 660 and 832 nm) and surface potential difference (-469 ~ 385 meV and -80 ~ 525 meV) of the embedded spinel XFO...
December 2016: Nanoscale Research Letters
https://www.readbyqxmd.com/read/27926784/preoperative-characteristics-and-cytological-features-of-136-histologically-confirmed-pancreatic-mucinous-cystic-neoplasms
#13
Aristana Scourtas, Jonathan C Dudley, William R Brugge, Abdurrahman Kadayifci, Mari Mino-Kenudson, Martha B Pitman
BACKGROUND: Mucinous cystic neoplasms (MCNs) of the pancreas present a management conundrum. The majority are benign but all are resected due to their malignant potential. Recent studies have recommended nonsurgical management. In the current study, the authors analyzed the preoperative imaging, cytology, and cyst fluid characteristics of 136 histologically confirmed MCNs to assess predictors of a high-risk (HR) cyst for surgical triage. METHODS: MCNs resected at the Massachusetts General Hospital between 1990 and 2014 formed the study cohort...
December 7, 2016: Cancer
https://www.readbyqxmd.com/read/27925736/electron-cooling-in-a-magnetically-expanding-plasma
#14
J M Little, E Y Choueiri
Electron cooling in a magnetically expanding plasma, which is a fundamental process for plasma flow and detachment in magnetic nozzles, is experimentally investigated using a radio frequency plasma source and magnetic nozzle (MN). Probe measurements of the plasma density, potential, and electron temperature along the center line of the MN indicate that the expansion follows a polytropic law with exponent γ_{e}=1.15±0.03. This value contradicts isothermal electron expansion, γ_{e}=1, which is commonly assumed in MN models...
November 25, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27925413/mechanism-of-water-oxidation-catalysed-by-a-mononuclear-manganese-complex-py2n-tbu-2mn-h2o-2-2
#15
Yingying Li, Ke Ye, Per E M Siegbahn, Rong-Zhen Liao
The design and synthesis of biomimetic Mn complexes to catalyze oxygen evolution is a very appealing goal since water oxidation in nature employs manganese. A mononuclear Mn complex 1 [LMnII(H2O)2]2+ (L=Py2N(tBu)2) was recently reported to catalyze water oxidation electrochemically with an applied potential of 1.23 V at pH=12.2 in aqueous solution. Density functional calculations have here been performed to elucidate the mechanism of water oxidation promoted by this catalyst. The calculations showed that 1 can readily lose two protons and one electron with the production of 2 [LMnIII(OH)2]+, which then undergoes two sequential proton-coupled electron transfer processes to afford 4 [LMnVOO]+...
December 7, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27925277/identification-of-sources-of-metal-in-the-agricultural-soils-of-guanzhong-plain-northwest-china
#16
Wenbo Deng, Xuxiang Li, Zhisheng An, Liu Yang, Kang Hou, Yue Zhang
In this study, we conducted a comprehensive survey to assess the possible sources and distribution of metals in the agricultural soils of Guanzhong Plain, northwest China. A total of 227 samples of agricultural soil were collected to determine the content of Pb, Cr, Co, V, Ni, Zn, Cu, As and Mn by X-ray fluorescence spectrometry. The mean concentrations of metals were 26.2 ± 10.8 mg · kg(-1) , 71.5 ± 16.8 mg · kg(-1) , 12.7 ± 1.81 mg · kg(-1) , 85.1 ± 7.86 mg · kg(-1) , 30...
December 7, 2016: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/27924816/an-analysis-of-human-exposure-to-trace-elements-from-deliberate-soil-ingestion-and-associated-health-risks
#17
Veronica M Ngole-Jeme, Georges-Ive E Ekosse, Sandile P Songca
Fifty-seven samples of soils commonly ingested in South Africa, Swaziland, Democratic Republic of Congo (DRC), and Togo were analyzed for the concentrations of arsenic (As), cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), lead (Pb), manganese (Mn), nickel (Ni), and zinc (Zn) and their bioaccessibility in the human gastrointestinal tract. Bioaccessibility values were used to calculate daily intake, and hazard quotient of each trace element, and chronic hazard index (CHI) of each sample. Carcinogenic risk associated with As and Ni exposure were also calculated...
December 7, 2016: Journal of Exposure Science & Environmental Epidemiology
https://www.readbyqxmd.com/read/27924787/controllable-synthesis-of-mn-6-doped-nanoparticles-by-a-facile-anion-exchange-method
#18
Xiaowen Zhang, Yang Li, Chenxing Liao, Zhi Chen, Jianrong Qiu
Fluorescence imaging in the second near-infrared window (NIR-II, 1000-1400 nm) is attracting extensive attention. Mn(6+) doped BaSO4 with broadband emission from 900 nm to 1400 nm is emerging as a new class of NIR phosphor for fluorescence imaging. Manganese has diverse valence states, thus it is difficult to prevent valence change of Mn(6+) during traditional synthesis process. In this work, BaSO4:Mn(6+) nanoparticles with uniform size and morphology were first successfully prepared through a fast liquid-solid solution route at room temperature...
January 13, 2017: Nanotechnology
https://www.readbyqxmd.com/read/27924706/analysis-of-inflammatory-markers-and-metals-in-nasal-lavage-fluid-of-welders
#19
Monika Raulf, Tobias Weiss, Anne Lotz, Martin Lehnert, Frank Hoffmeyer, Verena Liebers, Rainer Van Gelder, Heiko Udo Käfferlein, Andrea Hartwig, Beate Pesch, Thomas Brüning
Welding fumes may produce adverse health effects in the respiratory tract. To assess the relationship between exposure to welding fumes and inflammation in the upper airways, 190 male welders were examined from the WELDOX study (median age 40 yr, 54.7% smokers, and 32.9% atopics). Inhalable welding fumes were collected in the breathing zone of welders during a single shift. Chromium (Cr), nickel (Ni), manganese (Mn), and iron (Fe) were measured in the welding-fume samples and in postshift nasal lavage fluid (NALF)...
2016: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/27923992/sinorhizobium-meliloti-ybey-is-an-endoribonuclease-with-unprecedented-catalytic-features-acting-as-silencing-enzyme-in-riboregulation
#20
Margarida Saramago, Alexandra Peregrina, Marta Robledo, Rute G Matos, Rolf Hilker, Javier Serrania, Anke Becker, Cecilia M Arraiano, José I Jiménez-Zurdo
Structural and biochemical features suggest that the almost ubiquitous bacterial YbeY protein may serve catalytic and/or Hfq-like protective functions central to small RNA (sRNA)-mediated regulation and RNA metabolism. We have biochemically and genetically characterized the YbeY ortholog of the legume symbiont Sinorhizobium meliloti (SmYbeY). Co-immunoprecipitation (CoIP) with a FLAG-tagged SmYbeY yielded a poor enrichment in RNA species, compared to Hfq CoIP-RNA uncovered previously by a similar experimental setup...
December 6, 2016: Nucleic Acids Research
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