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https://www.readbyqxmd.com/read/29145137/uncertainty-in-positive-matrix-factorization-solutions-for-pahs-in-surface-sediments-of-the-yangtze-river-estuary-in-different-seasons
#1
Ruimin Liu, Cong Men, Wenwen Yu, Fei Xu, Qingrui Wang, Zhenyao Shen
To examine the variabilities of source contributions in the Yangtze River Estuary (YRE), the uncertainty based on the positive matrix factorization (PMF) was applied to the source apportionment of the 16 priority PAHs in 120 surface sediment samples from four seasons. Based on the signal-to-noise ratios, the PAHs categorized as "Bad" might drop out of the estimation of bootstrap. Next, the spatial variability of residuals was applied to determine which species with non-normal curves should be excluded. The median values from the bootstrapped solutions were chosen as the best estimate of the true factor contributions, and the intervals from 5th to 95th percentile represent the variability in each sample factor contribution...
October 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/29144280/selective-ion-permeation-through-strained-and-charged-graphene-membranes
#2
Kun Li, Yi Tao, Zhongwu Li, Jingjie Sha, Yunfei Chen
By means of molecular dynamics (MD) simulations and density functional theory (DFT) calculations, we demonstrate that stretched and charged graphene can act as ion sieve membranes. It is observed that loading 30% strain on graphene can induce pores in the dense electron cloud to allow ions to pass through the aromatic rings. Meanwhile, charged surface is helpful to peel the hydration layers from the ions and decrease the energy barrier for ion translocation through nanopores. Our results suggest that with membrane charge density of 6...
November 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29134817/the-bcr-abl1-negative-myeloproliferative-neoplasms-a-review-of-jak-inhibitors-in-the-therapeutic-armamentarium
#3
Martin Griesshammer, Parvis Sadjadian
The classical BCR-ABL1-negative myeloproliferative neoplasms (MPN) include primary myelofibrosis (PMF), polycythaemia vera (PV) and essential thrombocythaemia (ET). They are characterized by stem cell-derived clonal proliferation, harbour Janus kinase 2 (JAK2), or calreticulin (CALR), or myeloproliferative leukaemia virus oncogene (MPL) driver mutations and exert an over activated JAK-signal transducer and activator of transcription (STAT) pathway. Therefore JAK inhibiting strategies have been successfully investigated in MPN clinical trials...
November 14, 2017: Expert Opinion on Pharmacotherapy
https://www.readbyqxmd.com/read/29131977/source-apportionment-of-heavy-metals-in-agricultural-soil-based-on-pmf-a-case-study-in-hexi-corridor-northwest-china
#4
Qingyu Guan, Feifei Wang, Chuanqi Xu, Ninghui Pan, Jinkuo Lin, Rui Zhao, Yanyan Yang, Haiping Luo
Hexi Corridor is the most important base of commodity grain and producing area for cash crops. However, the rapid development of agriculture and industry has inevitably led to heavy metal contamination in the soils. Multivariate statistical analysis, GIS-based geostatistical methods and Positive Matrix Factorization (PMF) receptor modeling techniques were used to understand the levels of heavy metals and their source apportionment for agricultural soil in Hexi Corridor. The results showed that the average concentrations of Cr, Cu, Ni, Pb and Zn were lower than the secondary standard of soil environmental quality; however, the concentrations of eight metals (Cr, Cu, Mn, Ni, Pb, Ti, V and Zn) were higher than background values, and their corresponding enrichment factor values were significantly greater than 1...
October 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/29128551/transplant-decisions-in-patients-with-myelofibrosis-should-mutations-be-the-judge
#5
REVIEW
Rachel B Salit, H Joachim Deeg
The prognosis of myeloproliferative neoplasms (MPN), including primary myelofibrosis (PMF), polycythemia vera (PV; post-PV MF) and essential thrombocythemia (ET; post-EMF) varies considerably, between these disorders as well as within each diagnosis. Molecular studies have identified "driver mutations", in JAK2, MPL1 and CALR, and additional somatic DNA mutations, including ASXL1, EZH2, IDH1/2 and SRSF2, that affect prognosis differentially. Patients with mutations in CALR (type1) have a better outlook than patients with mutations in JAK2 or MPL, while patients without any of the driver mutations (triple negative) have the shortest life expectancy...
November 8, 2017: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/29127835/spatial-variations-source-apportionment-and-potential-ecological-risks-of-polycyclic-aromatic-hydrocarbons-and-synthetic-musks-in-river-sediments-in-shanghai-china
#6
Xue-Tong Wang, Bao-Ping Hu, Hang-Xin Cheng, Hao-Hao Jia, Ying Zhou
The aims of this study were to investigate the levels, possible sources and potential ecological risks of 26 polycyclic aromatic hydrocarbons (PAHs) including highly carcinogenic dibenzopyrene (DBP) isomers and 4 synthetic musks (SMs) in river sediments from Shanghai. 74 sediment samples were collected from the Huangpu River and its main tributaries. The total concentrations ranged from 52.0 to 11400 ng g(-1) for Σ26PAHs, 25.1-9910 ng g(-1) for 16 USEPA priority PAHs (Σ16PAHs), 0.769-384 ng g(-1) for Σ4DBPs, and 0...
October 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/29126093/temporal-spatial-characteristics-and-source-apportionment-of-pm2-5-as-well-as-its-associated-chemical-species-in-the-beijing-tianjin-hebei-region-of-china
#7
Jiajia Gao, Kun Wang, Yong Wang, Shuhan Liu, Chuanyong Zhu, Jiming Hao, Huanjia Liu, Shenbing Hua, Hezhong Tian
PM2.5 and its major chemical compositions were sampled and analyzed in January, April, July and October of 2014 at Beijing (BJ), Tianjin (TJ), Langfang (LF) and Baoding (BD) in order to probe the temporal and spatial characteristics as well as source apportionment of PM2.5 in the Beijing-Tianjin-Hebei (BTH) region. The results showed that PM2.5 pollution was severe in the BTH region. The average annual concentrations of PM2.5 at four sampling sites were in the range of 126-180 μg/m(3), with more than 95% of sampling days exceeding 35 μg/m(3), the limit ceiling of average annual concentration of PM2...
November 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29121603/assessment-of-light-extinction-at-a-european-polluted-urban-area-during-wintertime-impact-of-pm1-composition-and-sources
#8
R Vecchi, V Bernardoni, S Valentini, A Piazzalunga, P Fermo, G Valli
In this paper, results from receptor modelling performed on a well-characterised PM1 dataset were combined to chemical light extinction data (bext) with the aim of assessing the impact of different PM1 components and sources on light extinction and visibility at a European polluted urban area. It is noteworthy that, at the state of the art, there are still very few papers estimating the impact of different emission sources on light extinction as we present here, although being among the major environmental challenges at many polluted areas...
November 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29115418/predicting-pathogenic-genes-for-primary-myelofibrosis-based-on-a-system%C3%A2-network-approach
#9
Shu-Cai Xu, Peng Ning
The aim of the present study was to predict pathogenic genes for primary myelofibrosis (PMF) using a system‑network approach by combining protein‑protein interaction (PPI) network and gene expression data with known pathogenic genes. PMF gene expression profiles, known pathogenic genes and protein‑protein interactions were obtained. Using these data, differentially expressed genes (DEGs) were identified between PMF and normal conditions using significance analysis of microarrays, and seed genes were determined based on the intersection of known pathogenic genes and the PMF gene expression profile...
October 20, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29109998/mutation-l1196m-induced-conformational-changes-and-the-drug-resistant-mechanism-of-anaplastic-lymphoma-kinase-studied-by-free-energy-perturbation-and-umbrella-sampling
#10
Jianzhong Chen, Jinan Wang, Weiliang Zhu
Anaplastic lymphoma kinase (ALK) has been regarded as a promising drug target in the treatment of tumors and the mutation L1196M induces different levels of drug resistance toward the existing inhibitors. Free energy perturbation (FEP) coupled with umbrella sampling simulation is used to investigate the conformational change of ALK induced by L1196M and drug-resistant mechanisms of L1196M on four inhibitors VGH, 3U9, 5P8 and IV7. Dynamics analysis shows that L119M produces significant influences on the flexibility of the loops L1 and L2 in ALK...
November 7, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29107666/jak2-mutated-langerhans-cell-histiocytosis-associated-with-primary-myelofibrosis-treated-with-ruxolitinib
#11
Arturo Bonometti, Filippo Bagnoli, Daniele Fanoni, Luigia Venegoni, Laura Corti, Paola Bianchi, Elena Maria Elli, Giuseppe Isimbaldi, Vincenzo L'Imperio, Gianluca Nazzaro, Emanuela Passoni, Emilio Berti
The pathogenesis and cellular origin of Langerhans cell histiocytosis (LCH) are debated. Recently, mutations on MAPK and PI3K pathways have been linked to disrupted cell proliferation in LCH. Janus Kinase 2 (JAK2) mutations play the same role in Philadelphia-negative chronic myeloproliferative neoplasms. We describe the case of a patient affected by JAK2-positive Primary Myelofibrosis (PMF) who developed a clonally related LCH while in treatment with Ruxolitinib. JAK-inhibitors are well known to affect function and differentiation of different hematological lineages, including mononuclear phagocytes precursors...
October 28, 2017: Human Pathology
https://www.readbyqxmd.com/read/29098533/follicle-activation-is-a-significant-and-immediate-cause-of-follicle-loss-after-ovarian-tissue-transplantation
#12
Zohar Gavish, Itay Spector, Gil Peer, Stefan Schlatt, Joachim Wistuba, Hadassa Roness, Dror Meirow
PURPOSE: Extensive follicle loss has been demonstrated in ovarian grafts post transplantation, reducing their productivity and lifespan. Several mechanisms for this loss have been proposed, and this study aims to clarify when and how the massive follicle loss associated with transplantation of ovarian tissue graft occurs. An understanding of the mechanisms of follicle loss will pinpoint potential new targets for optimization and improvement of this important fertility preservation technique...
November 3, 2017: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/29096299/wet-deposition-of-sulfur-and-nitrogen-in-jiuzhaigou-national-nature-reserve-sichuan-china-during-2015-2016-possible-effects-from-regional-emission-reduction-and-local-tourist-activities
#13
Xue Qiao, Jie Du, Sri Harsha Kota, Qi Ying, Weiyang Xiao, Ya Tang
In order to understand the impacts of regional emission changes and local tourism on sulfur and nitrogen wet deposition in Jiuzhaigou National Nature Reserve of southwestern China, wet deposition was monitored at a background site (Rize) and a tourist-affected site (PE: park entrance) in the reserve during 2015-2016. The observation data were compared between Rize and PE and between 2010-2011 and 2015-2016 monitoring campaigns. Also, the observation data were used in the Positive Matrix Factorization (PMF) model to identify the major sources of sulfur and nitrogen wet deposition...
October 26, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29095616/the-driving-force-for-the-association-of-gemini-surfactants
#14
Kyeong-Jun Jeong, Arun Yethiraj
The self-assembly of surfactants into lyotropic liquid crystalline phases is interesting from a fundamental and practical perspective. The propensity for self-assembly is particularly interesting in Gemini surfactants which have a very low critical micelle concentration. In this work we study the effect of head-group identity on the driving force for the self-assembly of Gemini surfactants, using computer simulations of the potential of mean force (PMF). We find that surfactants with sulfonate head-groups have a greater tendency to assemble than those with carboxylate head-groups...
November 2, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29094132/computer-simulation-of-water-desalination-through-boron-nitride-nanotubes
#15
Lijun Liang, Jia-Chen Li, Li Zhang, Zhisen Zhang, Jia-Wei Shen, Lihua Li, Jianyang Wu
Development of high-efficiency and low-cost seawater desalination technologies is critical to solving the global water crisis. Herein we report a fast water filtering method with high salt rejection by boron nitride nanotubes (BNNTs). The effect of the radius of BNNTs on water filtering and salt rejection was investigated by molecular dynamics (MD) simulation. Our simulation results demonstrate that fast water permeation and high salt rejection could be achieved by BNNT(7,7) under both high pressure and low pressure...
November 2, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29081358/spinal-activation-of-protein-kinase-c-elicits-phrenic-motor-facilitation
#16
Michael J Devinney, Gordon S Mitchell
The protein kinase C family regulates many cellular functions, including multiple forms of neuroplasticity. The novel PKCθ and atypical PKCζ isoforms have been implicated in distinct forms of spinal, respiratory motor plasticity, including phrenic motor facilitation (pMF) following acute intermittent hypoxia or inactivity, respectively. Although these PKC isoforms are critical in regulating spinal motor plasticity, other isoforms may be important for phrenic motor plasticity. We tested the impact of conventional/novel PKC activator, phorbol 12-myristate 13-acetate (PMA) on pMF...
November 2, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/29080907/m-type-thioredoxins-are-involved-in-the-xanthophyll-cycle-and-proton-motive-force-to-alter-npq-under-low-light-conditions-in-arabidopsis
#17
Qingen Da, Ting Sun, Menglong Wang, Honglei Jin, Mengshu Li, Dongru Feng, Jinfa Wang, Hong-Bin Wang, Bing Liu
M-type thioredoxins are required to regulate zeaxanthin epoxidase activity and to maintain the steady-state level of the proton motive force, thereby influencing NPQ properties under low-light conditions in Arabidopsis. Non-photochemical quenching (NPQ) helps protect photosynthetic organisms from photooxidative damage via the non-radiative dissipation of energy as heat. Energy-dependent quenching (qE) is a major constituent of NPQ. However, the mechanism underlying the regulation of qE is not well understood...
October 28, 2017: Plant Cell Reports
https://www.readbyqxmd.com/read/29078392/exploitation-of-an-iron-transporter-for-bacterial-protein-antibiotic-import
#18
Paul White, Amar Joshi, Patrice Rassam, Nicholas G Housden, Renata Kaminska, Jonathan D Goult, Christina Redfield, Laura C McCaughey, Daniel Walker, Shabaz Mohammed, Colin Kleanthous
Unlike their descendants, mitochondria and plastids, bacteria do not have dedicated protein import systems. However, paradoxically, import of protein bacteriocins, the mechanisms of which are poorly understood, underpins competition among pathogenic and commensal bacteria alike. Here, using X-ray crystallography, isothermal titration calorimetry, confocal fluorescence microscopy, and in vivo photoactivatable cross-linking of stalled translocation intermediates, we demonstrate how the iron transporter FpvAI in the opportunistic pathogen Pseudomonas aeruginosa is hijacked to translocate the bacteriocin pyocin S2 (pyoS2) across the outer membrane (OM)...
October 25, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29074886/potential-of-mean-force-between-oppositely-charged-nanoparticles-a-comprehensive-comparison-between-poisson-boltzmann-theory-and-monte-carlo-simulations
#19
Jin-Si Zhang, Xi Zhang, Zhong-Liang Zhang, Zhi-Jie Tan
Ion-mediated interactions between like-charged polyelectrolytes have been paid much attention, and the Poisson-Boltzmann (PB) theory has been shown to fail in qualitatively predicting multivalent ion-mediated like-charge attraction. However, inadequate attention has been paid to the ion-mediated interactions between oppositely charged polyelectrolytes. In this work, the potentials of mean force (PMF) between oppositely charged nanoparticles in 1:1 and 2:2 salt solutions were investigated by Monte Carlo simulations and the PB theory...
October 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29059629/chemical-composition-and-source-apportionment-of-pm10-at-an-urban-background-site-in-a-high-altitude-latin-american-megacity-bogota-colombia
#20
Omar Ramírez, A M Sánchez de la Campa, Fulvio Amato, Ruth A Catacolí, Néstor Y Rojas, Jesús de la Rosa
Bogota registers frequent episodes of poor air quality from high PM10 concentrations. It is one of the main Latin American megacities, located at 2600 m in the tropical Andes, but there is insufficient data on PM10 source contribution. A characterization of the chemical composition and the source apportionment of PM10 at an urban background site in Bogota was carried out in this study. Daily samples were collected from June 2015 to May 2016 (a total of 311 samples). Organic carbon (OC), elemental carbon (EC), water soluble compounds (SO4(2-), Cl(-), NO3(-), NH4(+)), major elements (Al, Fe, Mg, Ca, Na, K, P) and trace metals (V, Cd, Pb, Sr, Ba, among others) were analyzed...
October 20, 2017: Environmental Pollution
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