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https://www.readbyqxmd.com/read/29145618/the-histone-variant-h2a-z-promotes-initiation-of-meiotic-recombination-in-fission-yeast
#1
Shintaro Yamada, Kazuto Kugou, Da-Qiao Ding, Yurika Fujita, Yasushi Hiraoka, Hiroshi Murakami, Kunihiro Ohta, Takatomi Yamada
Meiotic recombination is initiated by programmed formation of DNA double strand breaks (DSBs), which are mainly formed at recombination hotspots. Meiotic DSBs require multiple proteins including the conserved protein Spo11 and its cofactors, and are influenced by chromatin structure. For example, local chromatin around hotspots directly impacts DSB formation. Moreover, DSB is proposed to occur in a higher-order chromatin architecture termed 'axis-loop', in which many loops protrude from cohesin-enriched axis...
November 14, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29145453/the-antiviral-drug-tenofovir-an-inhibitor-of-pannexin-1-mediated-atp-release-prevents-liver-and-skin-fibrosis-by-downregulating-adenosine-levels-in-the-liver-and-skin
#2
Jessica L Feig, Aranzazu Mediero, Carmen Corciulo, Hailing Liu, Jin Zhang, Miguel Perez-Aso, Laura Picard, Tuere Wilder, Bruce Cronstein
BACKGROUND: Fibrosing diseases are a leading cause of morbidity and mortality worldwide and, therefore, there is a need for safe and effective antifibrotic therapies. Adenosine, generated extracellularly by the dephosphorylation of adenine nucleotides, ligates specific receptors which play a critical role in development of hepatic and dermal fibrosis. Results of recent clinical trials indicate that tenofovir, a widely used antiviral agent, reverses hepatic fibrosis/cirrhosis in patients with chronic hepatitis B infection...
2017: PloS One
https://www.readbyqxmd.com/read/29145395/positive-valence-music-restores-executive-control-over-sustained-attention
#3
Carryl L Baldwin, Bridget A Lewis
Music sometimes improves performance in sustained attention tasks. But the type of music employed in previous investigations has varied considerably, which can account for equivocal results. Progress has been hampered by lack of a systematic database of music varying in key characteristics like tempo and valence. The aims of this study were to establish a database of popular music varying along the dimensions of tempo and valence and to examine the impact of music varying along these dimensions on restoring attentional resources following performance of a sustained attention to response task (SART) vigil...
2017: PloS One
https://www.readbyqxmd.com/read/29145086/active-learning-for-classifying-data-streams-with-unknown-number-of-classes
#4
Saad Mohamad, Moamar Sayed-Mouchaweh, Abdelhamid Bouchachia
The classification of data streams is an interesting but also a challenging problem. A data stream may grow infinitely making it impractical for storage prior to processing and classification. Due to its dynamic nature, the underlying distribution of the data stream may change over time resulting in the so-called concept drift or the possible emergence and fading of classes, known as concept evolution. In addition, acquiring labels of data samples in a stream is admittedly expensive if not infeasible at all...
October 27, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/29145016/thermal-effect-on-the-degradation-of-hiapp20-29-fibrils
#5
H X Zhang, Lei Liu, Jie Wang, Christian Bortolini, Mingdong Dong
Uncontrolled misfolding of proteins resulting in the formation of amyloid deposits is associated with over 40 types of diseases, for instance, type-2 diabetes. The human Islet amyloid polypeptide (hIAPP) amyloid formation is thought to be the cause of type-2 diabetes occurrence. A possible strategy to the current challenge of reducing the toxicity of its aggregates to pancreatic β-cell is the discovery of an efficient way to degrading amyloid deposits. In this work, hIAPP20-29, a core fibrillating fragment of hIAPP, was selected as model system to explore the thermal effect at different temperature on the degradation of hIAPP20-29 mature fibrils...
October 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29144739/protac-induced-protein-degradation-in-drug-discovery-breaking-the-rules-or-just-making-new-ones
#6
Ian Churcher
Targeted protein degradation, using bifunctional small molecules (Protacs) to remove specific proteins from within cells, has emerged as a novel drug discovery strategy with the potential to offer therapeutic interventions not achievable with existing approaches. In this perspective, the brief history of the field is surveyed from a drug discovery perspective with a focus on the key advances in knowledge which have led to the definition and exemplification of protein degradation concepts, and their resulting applications to medicine discovery...
November 16, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29144733/a-mechanism-for-symmetry-breaking-and-shape-control-in-single-crystal-gold-nanorods
#7
Michael J Walsh, Wenming Tong, Hadas Katz-Boon, Paul Mulvaney, Joanne Etheridge, Alison M Funston
The phenomenon of symmetry breaking-in which the order of symmetry of a system is reduced despite manifest higher-order symmetry in the underlying fundamental laws-is pervasive throughout science and nature, playing a critical role in fields ranging from particle physics and quantum theory to cosmology and general relativity. For the growth of crystals, symmetry breaking is the crucial step required to generate a macroscopic shape that has fewer symmetry elements than the unit cell and/or seed crystal from which it grew...
November 16, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29144457/a-ubiquitin-dependent-signalling-axis-specific-for-alkbh-mediated-dna-dealkylation-repair
#8
Joshua R Brickner, Jennifer M Soll, Patrick M Lombardi, Cathrine B Vågbø, Miranda C Mudge, Clement Oyeniran, Renana Rabe, Jessica Jackson, Meagan E Sullender, Elyse Blazosky, Andrea K Byrum, Yu Zhao, Mark A Corbett, Jozef Gécz, Michael Field, Alessandro Vindigni, Geir Slupphaug, Cynthia Wolberger, Nima Mosammaparast
DNA repair is essential to prevent the cytotoxic or mutagenic effects of various types of DNA lesions, which are sensed by distinct pathways to recruit repair factors specific to the damage type. Although biochemical mechanisms for repairing several forms of genomic insults are well understood, the upstream signalling pathways that trigger repair are established for only certain types of damage, such as double-stranded breaks and interstrand crosslinks. Understanding the upstream signalling events that mediate recognition and repair of DNA alkylation damage is particularly important, since alkylation chemotherapy is one of the most widely used systemic modalities for cancer treatment and because environmental chemicals may trigger DNA alkylation...
November 16, 2017: Nature
https://www.readbyqxmd.com/read/29144297/effect-of-reagents-used-during-detection-and-quantification-of-ascaris-suum-in-environmental-samples-on-egg-viability
#9
Isaac Dennis Amoah, Poovendhree Reddy, Thor Axel Stenström
Soil-transmitted helminths (STHs) are a major health concern globally. Infection is mostly through contact with contaminated water, food or soil. Therefore to break the cycle of viable transmission STH eggs must be quantitatively detected in the environment. The effect of different reagents on the viability of Ascaris suum eggs during laboratory detection and quantification was assessed and different incubation solutions compared. Sulphuric acid gave a slightly higher recovery percentage of viable eggs (91...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144140/specific-monitoring-of-excited-state-symmetry-breaking-by-femtosecond-broadband-fluorescence-upconversion-spectroscopy
#10
Joseph S Beckwith, Arnulf Rosspeintner, Giuseppe Licari, Markus Lunzer, Brigitte Holzer, Johannes Fröhlich, Eric Vauthey
Most quadrupolar molecules designed for large two-photon absorption cross section have been shown to undergo symmetry-breaking upon excitation to the S1state. This was originally deduced from their strong fluorescence solvatochromism, and later visualised in real-time using transient infra-red spectroscopy. For molecules not containing clear IR marker modes however, a specific real-time observation of the symmetry-breaking process remains lacking. Here, we show that this process can be resolved using broadband fluorescence upconversion spectroscopy by monitoring the instantaneous emission transition dipole moment...
November 16, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29143960/predicting-frequent-emergency-department-use-among-children-with-epilepsy-a-retrospective-cohort-study-using-electronic-health-data-from-2-centers
#11
Zachary M Grinspan, Anup D Patel, Baria Hafeez, Erika L Abramson, Lisa M Kern
OBJECTIVE: Among children with epilepsy, to develop and evaluate a model to predict emergency department (ED) use, an indicator of poor disease control and/or poor access to care. METHODS: We used electronic health record data from 2013 to predict ED use in 2014 at 2 centers, benchmarking predictive performance against machine learning algorithms. We evaluated algorithms by calculating the expected yearly ED visits among the 5% highest risk individuals. We estimated the breakeven cost per patient per year for an intervention that reduced ED visits by 10%...
November 16, 2017: Epilepsia
https://www.readbyqxmd.com/read/29143840/nonaffine-deformation-and-tunable-yielding-of-colloidal-assemblies-at-the-air-water-interface
#12
Armando Maestro, Alessio Zaccone
Silica nanoparticles trapped at the air-water interface form a 2D solid state with amorphous order. We propose a theoretical model to describe how this solid-like state deforms under a shear strain ramp up to and beyond a yielding point which leads to plastic flow. The model accounts for all the particle-level and many-body physics of the system: nonaffine displacements, local connectivity and its evolution in terms of cage-breaking, and interparticle interactions mediated by the particle chemistry and colloidal forces...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29143726/recent-advances-in-vesicular-stomatitis-virus-based-oncolytic-virotherapy-a-5-year-update
#13
Sébastien A Felt, Valery Z Grdzelishvili
Oncolytic virus (OV) therapy is an anti-cancer approach that uses viruses that preferentially infect, replicate in and kill cancer cells. Vesicular stomatitis virus (VSV, a rhabdovirus) is an OV that is currently being tested in the USA in several phase I clinical trials against different malignancies. Several factors make VSV a promising OV: lack of pre-existing human immunity against VSV, a small and easy to manipulate genome, cytoplasmic replication without risk of host cell transformation, independence of cell cycle and rapid growth to high titres in a broad range of cell lines facilitating large-scale virus production...
November 16, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/29143703/dose-response-evaluation-of-the-standardized-ileal-digestible-tryptophan-lysine-ratio-to-maximize-growth-performance-of-growing-finishing-gilts-under-commercial-conditions
#14
M A D Gonçalves, M D Tokach, N M Bello, K J Touchette, R D Goodband, J M DeRouchey, J C Woodworth, S S Dritz
Environmental regulations as well as economic incentives have resulted in greater use of synthetic amino acids in swine diets. Tryptophan is typically the second limiting amino acid in corn-soybean meal-based diets. However, using corn-based co-products emphasizes the need to evaluate the pig's response to increasing Trp concentrations. Therefore, the objective of these studies was to evaluate the dose-response to increasing standardized ileal digestible (SID) Trp : Lys on growth performance of growing-finishing gilts housed under large-scale commercial conditions...
November 16, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/29143651/blocking-the-transmission-of-heartworm-dirofilaria-immitis-to-mosquitoes-aedes-aegypti-by-weekly-exposure-for-one-month-to-microfilaremic-dogs-treated-once-topically-with-dinotefuran-permethrin-pyriproxyfen
#15
John W McCall, Elizabeth Hodgkins, Marie Varloud, Abdelmoneim Mansour, Utami DiCosty
BACKGROUND: This study assessed the influence of a topical ectoparasiticide (dinotefuran-permethrin-pyriproxyfen, DPP, Vectra®3D, Ceva Animal Health) on the acquisition of heartworm microfilariae by mosquitoes exposed to microfilaremic dogs weekly for 1 month. METHODS: Six beagle dogs (9.2 ± 1.6 kg body weight) infected with Dirofilaria immitis were allocated to two groups of three dogs: an untreated control group and a DPP-treated group. Dogs were treated on Day 0 and exposed under sedation for 1 h to 80 ± 20 unfed Aedes aegypti...
November 9, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/29143586/break-out-session-highlights
#16
Kjell-Morten Myhr, Mathias Mäurer, Marisa Martínez Ginés, Federica Esposito, Ralf Linker
A popular feature of the Multiple Sclerosis Experts Summit is interactive break-out sessions to discuss various aspects of multiple sclerosis (MS), including MS spasticity and general management of MS patients. The format encourages participation and active discussion, thus providing attendees with the opportunity to exchange their experiences of the day-to-day management of MS in clinical practice. Following feedback provided by each session leader, key messages are summarized and presented in a plenary session by the Summit chair...
November 2017: Neurodegenerative Disease Management
https://www.readbyqxmd.com/read/29143536/time-for-a-new-zeitgeist-in-perinatal-mental-health
#17
Fiona Judd, Louise Kathryn Newman, Angela A Komiti
Perinatal depression, and to a lesser extent anxiety, has been the focus of interest for perinatal psychiatrists for several decades. Policy and substantial funding has supported this. We argue that it is now time to change this focus and to invest greater funding to support clinical and research effort in 'high-risk' caregivers and their infants. We define high-risk caregivers as those who are likely to have attachment and relationship difficulties with their infant as a result of their own developmental experiences, personality difficulties and/or trauma-related mental disorders, often complicated by substance abuse, depression and anxiety...
November 1, 2017: Australian and New Zealand Journal of Psychiatry
https://www.readbyqxmd.com/read/29143488/isolation-and-characterization-of-novel-goose-parvovirus-related-virus-reveal-the-evolution-of-waterfowl-parvovirus
#18
P Li, S Lin, R Zhang, J Chen, D Sun, J Lan, S Song, Z Xie, S Jiang
Short beak and dwarfism syndrome (SBDS) has been constantly breaking out in China since 2015. It is caused by a novel goose parvovirus-related virus (NGPV) and can severely restrict the growth of ducks. In this study, seven NGPV stains were isolated from different regions in China between 2015 and 2016. To better understand the correlation between NGPV and goose parvovirus (GPV), we conducted complete genome sequencing and a comprehensive analysis of the NGPV genome. The phylogenetic and alignment analysis showed that NGPV is a branch of GPV, sharing 92...
November 16, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/29143264/carbon-emissions-income-relationships-with-structural-breaks-the-case-of-the-middle-eastern-and-north-african-countries
#19
Ghassen El Montasser, Ahdi Noomen Ajmi, Duc Khuong Nguyen
This article revisits the carbon dioxide (CO2) emissions-GDP causal relationships in the Middle Eastern and North African (MENA) countries by employing the Rossi (Economet Theor 21:962-990, 2005) instability-robust causality test. We show evidence of significant causality relationships for all considered countries within the instability context, whereas the standard Granger causality test fails to detect causal links in any direction, except for Egypt, Iran, and Morocco. An important policy implication resulting from this robust analysis is that the income is not affected by the cuts in the CO2 emissions for only two MENA countries, the UAE and Syria...
November 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29142334/approaches-to-macroevolution-2-sorting-of-variation-some-overarching-issues-and-general-conclusions
#20
David Jablonski
Approaches to macroevolution require integration of its two fundamental components, within a hierarchical framework. Following a companion paper on the origin of variation, I here discuss sorting within an evolutionary hierarchy. Species sorting-sometimes termed species selection in the broad sense, meaning differential origination and extinction owing to intrinsic biological properties-can be split into strict-sense species selection, in which rate differentials are governed by emergent, species-level traits such as geographic range size, and effect macroevolution, in which rates are governed by organism-level traits such as body size; both processes can create hitchhiking effects, indirectly causing the proliferation or decline of other traits...
2017: Evolutionary Biology
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