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Interaction Contrast Ratio

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https://www.readbyqxmd.com/read/28334103/neuronal-and-peripheral-pentraxins-modify-glutamate-release-and-may-interact-in-blood-brain-barrier-failure
#1
Damian M Cummings, Tiffanie A Benway, Hinze Ho, Angelo Tedoldi, Monica M Fernandes Freitas, Lion Shahab, Christina E Murray, Angela Richard-Loendt, Sebastian Brandner, Tammaryn Lashley, Dervis A Salih, Frances A Edwards
Neuronal pentraxin 1 (NPTX1) has been implicated in Alzheimer's disease, being present in and around dystrophic neurons in plaques, affecting glutamatergic transmission postsynaptically and mediating effects of amyloidβ. Here, we confirm the presence of NPTX1 around plaques in postmortem Alzheimer's disease brain and report that acutely applied human NPTX1 increases paired-pulse ratio at mouse CA3-CA1 hippocampal synapses, indicating a decrease in glutamate release. In contrast, chronic exposure to NPTX1, NPTX2, or NPTX receptor decreases paired-pulse ratio, mimicking some of the earliest changes in mice expressing familial Alzheimer's disease genes...
February 23, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28302318/regional-differences-of-tibial-and-femoral-cartilage-in-the-chondrocyte-gene-expression-immunhistochemistry-and-composite-in-different-stages-of-osteoarthritis
#2
A Lahm, D Dabravolski, H Spank, H Merk, J Esser, R Kasch
The function of articular cartilage as an avascular tissue is mainly served by collagen type II and proteoglycan molecules. Within this matrix homeostasis between production and breakdown of the matrix is exceptionally sensitive. The current study was conducted to identify regional differences in specific alterations in cartilage composition during the osteoarthritic process of the human knee joint. Therefor the changes in the expression of the key molecules of the extracellular matrix were measured in dependence of the anatomical side (femoral vs tibial) and associated with immunohistochemistry and quantitative measurement...
February 24, 2017: Tissue & Cell
https://www.readbyqxmd.com/read/28299892/the-relationship-between-j-waves-and-contact-of-lung-cancer-with-the-heart
#3
Hideki Hayashi, Qi Wu, Minoru Horie
BACKGROUND: J waves result mainly from an increased density of transient outward current (Ito ). Mechanical stretch to the heart activates multiple signal transduction pathways, in which Ito may be involved. The purpose of this study was to test the hypothesis that mechanical contact of lung cancer with the heart may manifest J waves. METHODS: We reviewed 12-lead electrocardiograms to examine whether J waves were associated with contact of lung cancer with the heart...
March 16, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28294110/proposal-for-dark-exciton-based-chemical-sensors
#4
Maja Feierabend, Gunnar Berghäuser, Andreas Knorr, Ermin Malic
The rapidly increasing use of sensors throughout different research disciplines and the demand for more efficient devices with less power consumption depends critically on the emergence of new sensor materials and novel sensor concepts. Atomically thin transition metal dichalcogenides have a huge potential for sensor development within a wide range of applications. Their optimal surface-to-volume ratio combined with strong light-matter interaction results in a high sensitivity to changes in their surroundings...
March 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28289990/dual-contrast-agent-photon-counting-computed-tomography-of-the-heart-initial-experience
#5
Rolf Symons, Tyler E Cork, Manu N Lakshmanan, Robert Evers, Cynthia Davies-Venn, Kelly A Rice, Marvin L Thomas, Chia-Ying Liu, Steffen Kappler, Stefan Ulzheimer, Veit Sandfort, David A Bluemke, Amir Pourmorteza
To determine the feasibility of dual-contrast agent imaging of the heart using photon-counting detector (PCD) computed tomography (CT) to simultaneously assess both first-pass and late enhancement of the myocardium. An occlusion-reperfusion canine model of myocardial infarction was used. Gadolinium-based contrast was injected 10 min prior to PCD CT. Iodinated contrast was infused immediately prior to PCD CT, thus capturing late gadolinium enhancement as well as first-pass iodine enhancement. Gadolinium and iodine maps were calculated using a linear material decomposition technique and compared to single-energy (conventional) images...
March 13, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28287708/lignin-films-from-spruce-eucalyptus-and-wheat-straw-studied-with-electroacoustic-and-optical-sensors-effect-of-composition-and-electrostatic-screening-on-enzyme-binding
#6
Antonio Pereira, Ingrid C Hoeger, Ana Ferrer, Jorge Rencoret, José C Del Rio, Kristiina Kruus, Jenni Rahikainen, Miriam Kellock, Ana Gutiérrez, Orlando J Rojas
Lignins were isolated from spruce, wheat straw, and eucalyptus by using the milled wood lignin (MWL) method. Functional groups and compositional analyses were assessed via 2D NMR and (31)P NMR to realize their effect on enzyme binding. Films of the lignins were fabricated and ellipsometry, atomic force microscopy, and water contact angle measurements were used for their characterization and to reveal the changes upon enzyme adsorption. Moreover, lignin thin films were deposited on quartz crystal microgravimetry (QCM) and surface plasmon (SPR) resonance sensors and used to gain further insights into the lignin-cellulase interactions...
March 23, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28273829/combined-effects-of-ozone-and-drought-on-the-physiology-and-membrane-lipids-of-two-cowpea-vigna-unguiculata-l-walp-cultivars
#7
Deborah Moura Rebouças, Yuri Maia De Sousa, Matthieu Bagard, Jose Helio Costa, Yves Jolivet, Dirce Fernandes De Melo, Anne Repellin
The interactive effects of drought and ozone on the physiology and leaf membrane lipid content, composition and metabolism of cowpea (Vigna unguiculata (L.) Walp.) were investigated in two cultivars (EPACE-1 and IT83-D) grown under controlled conditions. The drought treatment (three-week water deprivation) did not cause leaf injury but restricted growth through stomatal closure. In contrast, the short-term ozone treatment (130 ppb 12 h daily during 14 day) had a limited impact at the whole-plant level but caused leaf injury, hydrogen peroxide accumulation and galactolipid degradation...
March 3, 2017: Plants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28267332/complexation-between-dna-and-hydrophilic-cationic-diblock-copolymers
#8
Seyoung Jung, Timothy P Lodge, Theresa M Reineke
We examine connections among polycation composition, DNA-polycation binding thermodynamics, binding strength, and resulting complex properties, for circular and linear DNA and hydrophilic diblock copolymers possessing cationic blocks. Two poly(2-deoxy-2-methacrylamido glucopyranose)-block-poly(N-(2-aminoethyl) methacrylamide) (PMAG-b-PAEMA), with block degrees of polymerization of PMAG56-b-PAEMA30 and PMAG52-b-PAEMA63, are employed. DNA binding behavior of these diblocks is also compared with that of a PAEMA homopolymer, in order to evaluate the role of the hydrophilic, charge-neutral PMAG block...
March 7, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28262696/cooperation-in-carbon-source-degradation-shapes-spatial-self-organization-of-microbial-consortia-on-hydrated-surfaces
#9
Robin Tecon, Dani Or
Mounting evidence suggests that natural microbial communities exhibit a high level of spatial organization at the micrometric scale that facilitate ecological interactions and support biogeochemical cycles. Microbial patterns are difficult to study definitively in natural environments due to complex biodiversity, observability and variable physicochemical factors. Here, we examine how trophic dependencies give rise to self-organized spatial patterns of a well-defined bacterial consortium grown on hydrated surfaces...
March 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28259814/spatial-impacts-of-inorganic-ligand-availability-and-localized-microbial-community-structure-on-mitigation-of-zinc-laden-mine-water-in-sulfate-reducing-bioreactors
#10
Dina M Drennan, Robert Almstrand, Jeffrey Ladderud, Ilsu Lee, Lee Landkamer, Linda Figueroa, Jonathan O Sharp
Sulfate-reducing bioreactors (SRBRs) represent a passive, sustainable, and long-term option for mitigating mining influenced water (MIW) during release. Here we investigate spatial zinc precipitation profiles as influenced by substrate differentiation, inorganic ligand availability (inorganic carbon and sulfide), and microbial community structure in pilot-scale SRBR columns fed with sulfate and zinc-rich MIW. Through a combination of aqueous sampling, geochemical digests, electron microscopy and energy-dispersive x-ray spectroscopy, we were able to delineate zones of enhanced zinc removal, identify precipitates of varying stability, and discern the temporal and spatial evolution of zinc, sulfur, and calcium associations...
February 20, 2017: Water Research
https://www.readbyqxmd.com/read/28259077/assessment-of-the-efficacy-of-membrane-filtration-processes-to-remove-human-enteric-viruses-and-the-suitability-of-bacteriophages-and-a-plant-virus-as-surrogates-for-those-viruses
#11
N Shirasaki, T Matsushita, Y Matsui, K Murai
Here, we evaluated the efficacy of direct microfiltration (MF) and ultrafiltration (UF) to remove three representative human enteric viruses (i.e., adenovirus [AdV] type 40, coxsackievirus [CV] B5, and hepatitis A virus [HAV] IB), and one surrogate of human caliciviruses (i.e., murine norovirus [MNV] type 1). Eight different MF membranes and three different UF membranes were used. We also examined the ability of coagulation pretreatment with high-basicity polyaluminum chloride (PACl) to enhance virus removal by MF...
February 24, 2017: Water Research
https://www.readbyqxmd.com/read/28257659/comprehensive-assessment-of-cucurbitacin-e-related-hepatotoxicity-and-drug-drug-interactions-involving-cyp3a-and-p-glycoprotein
#12
Jian Lu, Yuanjin Zhang, Min Sun, Mingyao Liu, Xin Wang
BACKGROUND: Cucurbitacin E (CuE), a tetracyclic triterpenoid isolated from Cucurbitaceae, possesses many pharmacological activities especially anti-cancer. PURPOSE: The aim of this investigation was to comprehensively assess CuE related hepatotoxicity and potential drug-drug interactions involving CYP3A and P-glycoprotein (P-gp). STUDY DESIGN AND METHODS: Four common cytotoxicity assays (MTS, SRB, NRU and apoptosis assays) were used to evaluate the hepatotoxicity of CuE in human hepatocellular carcinoma HepG2 cells...
March 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28254404/measuring-differential-treatment-benefit-across-marker-specific-subgroups-the-choice-of-outcome-scale
#13
Jaya M Satagopan, Alexia Iasonos
Clinical and epidemiological studies of anticancer therapies increasingly seek to identify predictive biomarkers to obtain insights into variation in treatment benefit. For time to event endpoints, a predictive biomarker is typically assessed using the interaction between the biomarker and treatment in a proportional hazards model. Interactions are contrasts of summaries of outcomes and depend upon the choice of the outcome scale. In this paper we investigate interaction contrasts under three scales - the natural logarithm of hazard ratio, the natural logarithm of survival probability, and survival probability at a pre-specified time...
February 22, 2017: Contemporary Clinical Trials
https://www.readbyqxmd.com/read/28248981/interaction-between-body-mass-index-and-hormone-receptor-status-as-a-prognostic-factor-in-lymph-node-positive-breast-cancer
#14
Il Yong Chung, Jong Won Lee, Ji Sung Lee, Yu Rang Park, Yul Ha Min, Yura Lee, Tae In Yoon, Guiyun Sohn, Sae Byul Lee, Jisun Kim, Hee Jeong Kim, Beom Seok Ko, Byung Ho Son, Sei Hyun Ahn
The aim of this study was to determine the relationship between the body mass index (BMI) at a breast cancer diagnosis and various factors including the hormone-receptor, menopause, and lymph-node status, and identify if there is a specific patient subgroup for which the BMI has an effect on the breast cancer prognosis. We retrospectively analyzed the data of 8,742 patients with non-metastatic invasive breast cancer from the research database of Asan Medical Center. The overall survival (OS) and breast-cancer-specific survival (BCSS) outcomes were compared among BMI groups using the Kaplan-Meier method and Cox proportional-hazards regression models with an interaction term...
2017: PloS One
https://www.readbyqxmd.com/read/28247509/the-age-dependent-association-between-aortic-pulse-wave-velocity-and-telomere-length
#15
Barry J McDonnell, Yasmin, Lee Butcher, John R Cockcroft, Ian B Wilkinson, Jorge D Erusalimsky, Carmel M McEniery
KEY POINTS: Age significantly modifies the relationship between aortic pulse wave velocity and telomere length. The differential relationships observed between aortic pulse wave velocity and telomere length in younger and older individuals suggest that the links between cellular and vascular ageing reflect a complex interaction between genetic and environmental factors acting over the life-course. ABSTRACT: Ageing is associated with marked large artery stiffening...
March 1, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28241187/mismatch-repair-deficiency-microsatellite-instability-and-survival-an-exploratory-analysis-of-the-medical-research-council-adjuvant-gastric-infusional-chemotherapy-magic-trial
#16
Elizabeth C Smyth, Andrew Wotherspoon, Clare Peckitt, David Gonzalez, Sanna Hulkki-Wilson, Zakaria Eltahir, Matteo Fassan, Massimo Rugge, Nicola Valeri, Alicia Okines, Madeleine Hewish, William Allum, Sally Stenning, Matthew Nankivell, Ruth Langley, David Cunningham
Importance: Mismatch repair (MMR) deficiency (MMRD) and microsatellite instability (MSI) are prognostic for survival in many cancers and for resistance to fluoropyrimidines in early colon cancer. However, the effect of MMRD and MSI in curatively resected gastric cancer treated with perioperative chemotherapy is unknown. Objective: To examine the association among MMRD, MSI, and survival in patients with resectable gastroesophageal cancer randomized to surgery alone or perioperative epirubicin, cisplatin, and fluorouracil chemotherapy in the Medical Research Council Adjuvant Gastric Infusional Chemotherapy (MAGIC) trial...
February 23, 2017: JAMA Oncology
https://www.readbyqxmd.com/read/28221826/the-behavioral-type-of-a-top-predator-drives-the-short-term-dynamic-of-intraguild-predation
#17
Radek Michalko, Stano Pekár
Variation in behavior among individual top predators (i.e., the behavioral type) can strongly shape pest suppression in intraguild predation (IGP). However, the effect of a top predator's behavioral type-namely, foraging aggressiveness (number of killed divided by prey time) and prey choosiness (preference degree for certain prey type)-on the dynamic of IGP may interact with the relative abundances of top predator, mesopredator, and pest. We investigated the influence of the top predator's behavioral type on the dynamic of IGP in a three-species system with a top predator spider, a mesopredator spider, and a psyllid pest using a simulation model...
March 2017: American Naturalist
https://www.readbyqxmd.com/read/28220487/sex-differences-and-allee-effects-shape-the-dynamics-of-sex-structured-invasions
#18
Allison K Shaw, Hanna Kokko, Michael G Neubert
The rate at which a population grows and spreads can depend on individual behaviour and interactions with others. In many species with two sexes, males and females differ in key life history traits (e.g. growth, survival, dispersal), which can scale up to affect population rates of growth and spread. In sexually reproducing species, the mechanics of locating mates and reproducing successfully introduce further complications for predicting the invasion speed (spread rate), as both can change nonlinearly with density...
February 20, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28216312/bone-marrow-lesions-on-magnetic-resonance-imaging-in-hand-osteoarthritis-are-associated-with-pain-and-interact-with-synovitis
#19
R Liu, W Damman, M Reijnierse, J L Bloem, F R Rosendaal, M Kloppenburg
OBJECTIVE: To determine the association between bone marrow lesions (BMLs) and (teno)synovitis as assessed on magnetic resonance (MR) imaging in patients with pain in hand osteoarthritis (OA). METHODS: In 105 consecutive primary hand OA patients (83% women, mean age 59 years), who were diagnosed by rheumatologists and included in the HOSTAS (Hand OSTeoArthritis in Secondary care) cohort, contrast enhanced MR imaging of right distal and proximal interphalangeal (PIP) joints were obtained...
February 12, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28215085/peptide-functionalized-gold-nanoparticles-as-a-stimuli-responsive-contrast-medium-in-multiphoton-microscopy
#20
Johan Borglin, Robert Selegård, Daniel Aili, Marica B Ericson
There is a need for biochemical contrast mediators with high signal-to-noise ratios enabling noninvasive biomedical sensing, for example, for neural sensing and protein-protein interactions, in addition to cancer diagnostics. The translational challenge is to develop a biocompatible approach ensuring high biochemical contrast while avoiding a raise of the background signal. We here present a concept where gold nanoparticles (AuNPs) can be utilized as a stimuli responsive contrast medium by chemically triggering their ability to exhibit multiphoton-induced luminescence (MIL) when performing multiphoton laser scanning microscopy (MPM)...
March 8, 2017: Nano Letters
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