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https://www.readbyqxmd.com/read/28230209/direct-observation-of-the-dynamics-of-single-metal-ions-at-the-interface-with-solids-in-aqueous-solutions
#1
Maria Ricci, William Trewby, Clodomiro Cafolla, Kislon Voïtchovsky
The dynamics of ions adsorbed at the surface of immersed charged solids plays a central role in countless natural and industrial processes such as crystal growth, heterogeneous catalysis, electrochemistry, or biological function. Electrokinetic measurements typically distinguish between a so-called Stern layer of ions and water molecules directly adsorbed on to the solid's surface, and a diffuse layer of ions further away from the surface. Dynamics within the Stern layer remain poorly understood, largely owing to a lack of in-situ atomic-level insights...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28220766/immunological-biomarkers-and-long-term-graft-survival-prospective-follow-up-of-457-kidney-transplant-recipients
#2
Michał Ciszek, Krzysztof Mucha, Bartosz Foroncewicz, Dorota Żochowska, Maciej Kosieradzki, Tadeusz Grochowiecki, Magdalena Durlik, Andrzej Górski, Leszek Pączek
INTRODUCTION    Antibodies against donor`s human leukocyte antigens (HLA) play a significant role in the pathogenesis of antibody mediated rejection, although their role during the late post-transplant period is unknown. A non-HLA polymorphic antigenic system like major histocompatibility class I chain-related antigen A (MICA) might be another target for antibody responses involved in rejection. OBJECTIVES    We conducted a 7-year prospective study to determine the effect of positivity for anti-HLA and anti-MICA antibodies on kidney graft survival...
February 15, 2017: Polskie Archiwum Medycyny Wewnętrznej
https://www.readbyqxmd.com/read/28197392/p38-mapk-differentially-controls-nk-activating-ligands-at-transcriptional-and-post-transcriptional-level-on-multiple-myeloma-cells
#3
Alessandra Soriani, Cristiana Borrelli, Biancamaria Ricci, Rosa Molfetta, Alessandra Zingoni, Cinzia Fionda, Silvia Carnevale, Maria Pia Abruzzese, Maria Teresa Petrucci, Maria Rosaria Ricciardi, Giuseppe La Regina, Erica Di Cesare, Patrizia Lavia, Romano Silvestri, Rossella Paolini, Marco Cippitelli, Angela Santoni
The mechanisms that regulate the expression of the NKG2D and DNAM-1 activating ligands are only partially known, but it is now widely established that their expression is finely regulated at transcriptional, post-transcriptional and post-translational level, and involve numerous stress pathways depending on the type of ligand, stressor, and cell context. We show that treatment of Multiple Myeloma (MM) cells with sub-lethal doses of Vincristine (VCR), an anticancer drug that inhibits the assembly of microtubules, stimulates the expression of NKG2D and DNAM-1 activating ligands, rendering these cells more susceptible to NK cell-mediated killing...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28193441/double-layer-ensemble-monitoring-of-non-gaussian-processes-using-modified-independent-component-analysis
#4
Chudong Tong, Ting Lan, Xuhua Shi
The modified independent component analysis (MICA) was proposed mainly to obtain a consistent solution that cannot be ensured in the original ICA algorithm and has been widely investigated in multivariate statistical process monitoring (MSPM). Within the MICA-based non-Gaussian process monitoring circle, there are two main problems, i.e., the selection of a proper non-quadratic function for measuring non-Gaussianity and the determination of dominant ICs for constructing latent subspace, have not been well attempted so far...
February 10, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28191644/nk-cell-receptors-nkp46-and-ncr1-control-human-metapneumovirus-infection
#5
Mohammad Diab, Ariella Glasner, Batya Issacson, Yotam Bar-On, Yaron Drori, Rachel Yamin, Alexandra Duev-Cohen, Oded Danziger, Rachel Zamostiano, Michal Mandelboim, Stipan Jonjic, Eran Bacharach, Ofer Mandelboim
Natural killer (NK) cells are capable of killing various pathogens upon stimulation of activating receptors. Human metapneumovirus (HMPV) is a respiratory virus, which was discovered in 2001 and is responsible for acute respiratory tract infection in infants and children worldwide. HMPV infection is very common, infecting around 70% of all children under the age of five. Under immune suppressive conditions, HMPV infection can be fatal. Not much is known on how NK cells respond to HMPV. In this study, using reporter assays and NK-cell cytotoxicity assays performed with human and mouse NK cells, we demonstrated that the NKp46 activating receptor and its mouse orthologue Ncr1, both members of the NCR family, recognized an unknown ligand expressed by HMPV infected human cells...
February 13, 2017: European Journal of Immunology
https://www.readbyqxmd.com/read/28188823/hepatic-stellate-cell-interferes-with-nk-cell-regulation-of-fibrogenesis-via-curcumin-induced-senescence-of-hepatic-stellate-cell
#6
Huanhuan Jin, Yan Jia, Zhen Yao, Jingjing Huang, Meng Hao, Shunyu Yao, Naqi Lian, Feng Zhang, Chenxi Zhang, Xingran Chen, Mianli Bian, Jiangjuan Shao, Li Wu, Anping Chen, Shizhong Zheng
Hepatic fibrosis, a common scarring response to various forms of chronic liver injury, is a precursor to cirrhosis and liver cancer. During liver fibrosis, hepatic stellate cells (HSCs) initially activate and proliferate, which are responsible for the secretion of extracellular matrix components. However, these cells eventually senesce and are cleared by natural killer (NK) cells. Our previous researches have shown that the natural product curcumin could promote the senescence of activated HSC. In this study, we investigated how NK cells target senescent HSC and assessed the effect of this process on liver fibrosis...
February 8, 2017: Cellular Signalling
https://www.readbyqxmd.com/read/28181615/true-non-contact-atomic-force-microscopy-imaging-of-heterogeneous-biological-samples-in-liquids-topography-and-material-contrast
#7
Lisa Almonte, Jaime Colchero
The present work analyses how the tip-sample interaction signals critically determine the operation of an Atomic Force Microscope (AFM) set-up immersed in liquid. On heterogeneous samples, the conservative tip-sample interaction may vary significantly from point to point - in particular from attractive to repulsive - rendering correct feedback very challenging. Lipid membranes prepared on a mica substrate are analyzed as reference samples which are locally heterogeneous (material contrast). The AFM set-up is operated dynamically at low oscillation amplitude and all available experimental data signals - the normal force, as well as the amplitude and frequency - are recorded simultaneously...
February 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/28177768/ethanol-dependent-expression-of-the-nkg2d-ligands-mica-b-in-human-cell-lines-and-leukocytes
#8
Maria A Streltsova, Anna V Klinkova, Anastasia A Kuchukova, Andrey Y Kadin, Leonid M Kanevskiy, Elena I Kovalenko
Alcohol consumption affects human immune system, causing a variety of disorders. However, the mechanisms of development of these alterations are not fully understood. We hypothesized that ethanol may influence the expression of MICA and MICB, stress-induced molecules capable to regulate activity of cytotoxic lymphocytes through the interaction with receptor NKG2D, which substantially affects the functionality of cellular immunity. We analyzed effects of ethanol on MICA/B expression in tumor cell lines and human leukocytes...
November 2, 2016: Biochemistry and Cell Biology, Biochimie et Biologie Cellulaire
https://www.readbyqxmd.com/read/28169232/membrane-bound-versus-soluble-major-histocompatibility-complex-class-i-related-chain-a-and-major-histocompatibility-complex-class-i-related-chain-b-differential-expression-mechanisms-of-tumor-eradication-versus-evasion-and-current-drug-development-strategies
#9
REVIEW
P K Suresh
Major histocompatibility complex Class I-related chain A/chain B (MICA/MICB) is stress-inducible, highly polymorphic ligands whose expression at the transcript level has been detected in all tissues except the central nervous system. However, their restricted protein expression is due to their regulation at the posttranslational level. Its levels are elevated in virally infected and neoplastically transformed cells. Membrane expression of this NKG2DL marks the aberrant cells for elimination by those immune effector cells that express the cognate NKG2D receptor...
October 2016: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28167425/effect-of-cation-alkyl-chain-length-on-surface-forces-and-physical-properties-in-deep-eutectic-solvents
#10
Zhengfei Chen, Michael Ludwig, Gregory G Warr, Rob Atkin
Deep eutectic solvents (DESs) have been prepared from mixtures of alkyl ammonium bromide salts (ethylammonium bromide, propylammonium bromide and butylammonium bromide) and glycerol at a 1: 2 M ratio. These DESs reveal the effect of cation alkyl chain length on interfacial structure at mica (a model anionic) surface. As the cation chain length is increased it becomes more amphiphilic and solvophobic, leading to stronger association of alkyl chains, as revealed by atomic force microscope force curve measurements...
May 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28155659/grouping-mirnas-of-similar-functions-via-weighted-information-content-of-gene-ontology
#11
Chaowang Lan, Qingfeng Chen, Jinyan Li
BACKGROUND: Regulation mechanisms between miRNAs and genes are complicated. To accomplish a biological function, a miRNA may regulate multiple target genes, and similarly a target gene may be regulated by multiple miRNAs. Wet-lab knowledge of co-regulating miRNAs is limited. This work introduces a computational method to group miRNAs of similar functions to identify co-regulating miRNAsfrom a similarity matrix of miRNAs. RESULTS: We define a novel information content of gene ontology (GO) to measure similarity between two sets of GO graphs corresponding to the two sets of target genes of two miRNAs...
December 22, 2016: BMC Bioinformatics
https://www.readbyqxmd.com/read/28147691/a-simple-photoacoustic-detector-for-highly-corrosive-gases
#12
J Rakovský, O Votava
In this work, we present a new design of a cantilever-type photoacoustic (PA) detector with high chemical resistance to be used for a broad range of gaseous samples including highly corrosive gasses. A thin mica cantilever used to sense the PA pressure is the only part that comes into direct contact with the sample gas as its deflection is sensed by a probe laser from outside of the gas cell. The design of the detector is simple, compact, and affordable. It can be constructed without any special fabrication procedure in laboratories equipped with a standard mechanical and electronic workshop...
January 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28146676/from-here-to-autonomy
#13
Mica R Endsley
As autonomous and semiautonomous systems are developed for automotive, aviation, cyber, robotics and other applications, the ability of human operators to effectively oversee and interact with them when needed poses a significant challenge. An automation conundrum exists in which as more autonomy is added to a system, and its reliability and robustness increase, the lower the situation awareness of human operators and the less likely that they will be able to take over manual control when needed. The human-autonomy systems oversight model integrates several decades of relevant autonomy research on operator situation awareness, out-of-the-loop performance problems, monitoring, and trust, which are all major challenges underlying the automation conundrum...
February 2017: Human Factors
https://www.readbyqxmd.com/read/28139934/oriented-reconstitution-of-the-full-length-kcsa-potassium-channel-in-a-lipid-bilayer-for-afm-imaging
#14
Ayumi Sumino, Takayuki Uchihashi, Shigetoshi Oiki
Here, we have developed a method of oriented reconstitution of the KcsA potassium channel amenable to high-resolution AFM imaging. The solubilized full-length KcsA channels with histidine-tagged (His-tag) C-terminal ends were attached to a Ni(2+)-coated mica surface, and then detergent-destabilized liposomes were added to fill the interchannel space. AFM revealed that the membrane-embedded KcsA channels were oriented with their extracellular faces upward, seen as a tetrameric square shape. This orientation was corroborated by the visible binding of a peptide scorpion toxin, agitoxin-2...
February 1, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28135478/likelihood-of-breastfeeding-within-the-usda-s-food-and-nutrition-service-special-supplemental-nutrition-program-for-women-infants-and-children-population
#15
Bailey Houghtaling, Carmen Byker Shanks, Mica Jenkins
BACKGROUND: Breastfeeding is an important public health initiative. Low-income women benefiting from the U.S. Department of Agriculture's Food and Nutrition Service Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) are a prime population for breastfeeding promotion efforts. Research aim: This study aims to determine factors associated with increased likelihood of breastfeeding for WIC participants. METHODS: The Preferred Reporting Items for Systematic Reviews and Meta-Analysis statement guided the systematic review of literature...
February 2017: Journal of Human Lactation: Official Journal of International Lactation Consultant Association
https://www.readbyqxmd.com/read/28129201/an-attempt-to-apply-the-inelastic-thermal-spike-model-to-surface-modifications-of-caf2-induced-by-highly-charged-ions-comparison-to-swift-heavy-ions-effects-and-extension-to-some-others-material
#16
C Dufour, V Khomrenkov, Y Y Wang, Z G Wang, F Aumayr, M Toulemonde
Surface damage appears on materials irradiated by highly charged ions (HCI). Since a direct link has been found between surface damage created by HCI with the one created by swift heavy ions (SHI), the inelastic thermal spike model (i-TS model) developed to explain track creation resulting from the electron excitation induced by SHI can also be applied to describe the response of materials under HCI which transfers its potential energy to electrons of the target. An experimental description of the appearance of the hillock-like nanoscale protrusions induced by SHI at the surface of CaF2 is presented in comparison with track formation in bulk which shows that the only parameter on which we can be confident is the electronic energy loss threshold...
March 8, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28098874/mica-il-12-a-novel-bifunctional-protein-for-killer-cell-activation
#17
Ashlee Tietje, Xi Yang, Xianzhong Yu, Yanzhang Wei
Natural killer (NK) cells have the potential to be effective killers of tumor cells. They are governed by inhibitory and activating receptors such as NKG2D, whose ligands are normally upregulated in cells that are stressed, like cancer cells. Advanced cancer cells, however, have ways to reduce the expression of these ligands, leaving them less detectable by NK cells. Along with these receptors, NK cells also require activating cytokines, such as IL-12. A previous study in our laboratory showed that a fusion protein of the extracellular domain of mouse UL-16 binding protein-like transcript 1 (MULT1E) and mouse interleukin 12 (IL-12) can effectively activate mouse NK cells by in vitro assays and in vivo in animal tumor models...
January 16, 2017: Oncology Reports
https://www.readbyqxmd.com/read/28098185/hydrocarbons-in-phlogopite-from-kasenyi-kamafugitic-rocks-sw-uganda-cross-correlated-afm-confocal-microscopy-and-raman-imaging
#18
Daniele Moro, Giovanni Valdrè, Ernesto Mesto, Fernando Scordari, Maria Lacalamita, Giancarlo Della Ventura, Fabio Bellatreccia, Salvatore Scirè, Emanuela Schingaro
This study presents a cross-correlated surface and near surface investigation of two phlogopite polytypes from Kasenyi kamafugitic rocks (SW Uganda) by means of advanced Atomic Force Microscopy (AFM), confocal microscopy and Raman micro-spectroscopy. AFM revealed comparable nanomorphology and electrostatic surface potential for the two mica polytypes. A widespread presence of nano-protrusions located on the mica flake surface was also observed, with an aspect ratio (maximum height/maximum width) from 0.01 to 0...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28088726/fabrication-of-highly-hydrophilic-filter-using-natural-and-hydrothermally-treated-mica-nanoparticles-for-efficient-waste-oil-water-separation
#19
Udara Bimendra Gunatilake, Jayasundera Bandara
For the effective oil/water separation, a novel superhydrophilic (underwater superoleophobic) filter is fabricated with the naturally and hydrothermally treated mica particles. To fabricate a double layered filter, hydrothermally treated mica particles were initially electrodeposited on a stainless steel mesh and a natural mica particles were sprayed on the first hydrothermally deposited mica layer. The double layered mica coated membrane showed superamphiphilic and superhydrophilic/superoleophobic (contact angle >159°) characteristics in air and underwater respectively...
January 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28088489/does-mhc-class-i-chain-related-gene-a-matter
#20
Aleksander Chojecki
In this issue of Biology of Blood and Marrow Transplantation, Askar et al. evaluate the association of MHC class I chain-related gene A (MICA) polymorphisms with the development of graft-versus host-disease (GVHD) after unrelated donor hematopoietic stem cell transplantation (HCT) [1]. Prior reports have provided conflicting results, leaving the effect of MICA donor-recipient mismatch in HCT unanswered.
January 11, 2017: Biology of Blood and Marrow Transplantation
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