keyword
MENU ▼
Read by QxMD icon Read
search

Swarm

keyword
https://www.readbyqxmd.com/read/28928721/onion-peel-ethylacetate-fraction-and-its-derived-constituent-quercetin-4-o-%C3%AE-d-glucopyranoside-attenuates-quorum-sensing-regulated-virulence-and-biofilm-formation
#1
Hanan M Al-Yousef, Atallah F Ahmed, Nasser A Al-Shabib, Sameen Laeeq, Rais A Khan, Md T Rehman, Ali Alsalme, Mohamed F Al-Ajmi, Mohammad S Khan, Fohad M Husain
The resistance and pathogenesis of bacteria could be related to their ability to sense and respond to population density, termed quorum sensing (QS). Inhibition of the QS system is considered as a novel strategy for the development of antipathogenic agents, especially for combating drug-resistant bacterial infections. In the present study, the anti-QS activity of Onion peel ethylacetate fraction (ONE) was tested against Chromobacterium violaceum CV12472 and Pseudomonas aeruginosa PAO1. ONE inhibit the QS-mediated virulence factors production such as violacein in C...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28928365/multiple-genome-constellations-of-similar-and-distinct-influenza-a-viruses-co-circulate-in-pigs-during-epidemic-events
#2
Andres Diaz, Douglas Marthaler, Cesar Corzo, Claudia Muñoz-Zanzi, Srinand Sreevatsan, Marie Culhane, Montserrat Torremorell
Swine play a key role in the ecology and transmission of influenza A viruses (IAVs) between species. However, the epidemiology and diversity of swine IAVs is not completely understood. In this cohort study, we sampled on a weekly basis 132 3-week old pigs for 15 weeks. We found two overlapping epidemic events of infection in which most pigs (98.4%) tested PCR positive for IAVs. The prevalence rate of infection ranged between 0 and 86% per week and the incidence density ranged between 0 and 71 cases per 100 pigs-week...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28928146/ant-inspired-density-estimation-via-random-walks
#3
Cameron Musco, Hsin-Hao Su, Nancy A Lynch
Many ant species use distributed population density estimation in applications ranging from quorum sensing, to task allocation, to appraisal of enemy colony strength. It has been shown that ants estimate local population density by tracking encounter rates: The higher the density, the more often the ants bump into each other. We study distributed density estimation from a theoretical perspective. We prove that a group of anonymous agents randomly walking on a grid are able to estimate their density within a small multiplicative error in few steps by measuring their rates of encounter with other agents...
September 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28926949/influence-of-freeze-drying-and-oven-drying-post-blanching-on-the-nutrient-composition-of-the-edible-insect-ruspolia-differens
#4
Forkwa Tengweh Fombong, Mik Van Der Borght, Jozef Vanden Broeck
The longhorn grasshopper, Ruspolia differens (Serville), plays an important role as a food source across Sub-Saharan Africa, where it is consumed as a delicacy in both rural and urban areas. The effect of two drying methods (freeze-drying and oven-drying), employed after blanching, on the proximate, fatty acid and mineral composition of the two most common morphs was determined. Ruspolia differens grasshoppers were harvested in Uganda and Kenya from wild swarms during the rainy periods of November-December 2016...
September 16, 2017: Insects
https://www.readbyqxmd.com/read/28926759/instructed-subsets-or-agile-swarms-how-t-helper-cells-may-adaptively-counter-uncertainty-with-variability-and-plasticity
#5
REVIEW
Edward C Schrom, Andrea L Graham
Over recent years, extensive phenotypic variability and plasticity have been revealed among the T-helper cells of the mammalian adaptive immune system, even within clonal lineages of identical antigen specificity. This challenges the conventional view that T-helper cells assort into functionally distinct subsets following differential instruction by the innate immune system. We argue that the adaptive value of coping with uncertainty can reconcile the 'instructed subset' framework with T-helper variability and plasticity...
September 16, 2017: Current Opinion in Genetics & Development
https://www.readbyqxmd.com/read/28919968/a-new-species-of-melitaea-from-israel-with-notes-on-taxonomy-cytogenetics-phylogeography-and-interspecific-hybridization-in-the-melitaea-persea-complex-lepidoptera-nymphalidae
#6
Vladimir A Lukhtanov
Specimens with intermediate morphology are often considered to be the result of ongoing interspecific hybridization; however, this conclusion is difficult to prove without analysis of chromosomal and/or molecular markers. In the butterfly genus Melitaea, such an intermediacy can be detected in male genitalia, and is more or less regularly observed in localities where two closely related, presumably parental species are found in sympatry. Here I analyze a high altitude Melitaea population from Mt. Hermon in north Israel and show that its male genitalia are clearly differentiated from those found in phenotypically similar M...
2017: Comparative Cytogenetics
https://www.readbyqxmd.com/read/28919787/computational-tool-for-optimizing-the-essential-oils-utilization-in-inhibiting-the-bacterial-growth
#7
Noha E El-Attar, Wael A Awad
Day after day, the importance of relying on nature in many fields such as food, medical, pharmaceutical industries, and others is increasing. Essential oils (EOs) are considered as one of the most significant natural products for use as antimicrobials, antioxidants, antitumorals, and anti-inflammatories. Optimizing the usage of EOs is a big challenge faced by the scientific researchers because of the complexity of chemical composition of every EO, in addition to the difficulties to determine the best in inhibiting the bacterial activity...
2017: Advances and Applications in Bioinformatics and Chemistry: AABC
https://www.readbyqxmd.com/read/28919286/a-novel-optimized-hybrid-fuzzy-logic-intelligent-pid-controller-for-an-interconnected-multi-area-power-system-with-physical-constraints-and-boiler-dynamics
#8
A H Gomaa Haroun, Yin-Ya Li
In the fast developing world nowadays, load frequency control (LFC) is considered to be a most significant role for providing the power supply with good quality in the power system. To deliver a reliable power, LFC system requires highly competent and intelligent control technique. Hence, in this article, a novel hybrid fuzzy logic intelligent proportional-integral-derivative (FLiPID) controller has been proposed for LFC of interconnected multi-area power systems. A four-area interconnected thermal power system incorporated with physical constraints and boiler dynamics is considered and the adjustable parameters of the FLiPID controller are optimized using particle swarm optimization (PSO) scheme employing an integral square error (ISE) criterion...
September 14, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28916778/hydrogeochemical-changes-before-and-during-the-2016-amatrice-norcia-seismic-sequence-central-italy
#9
Marino Domenico Barberio, Maurizio Barbieri, Andrea Billi, Carlo Doglioni, Marco Petitta
Seismic precursors are an as yet unattained frontier in earthquake studies. With the aim of making a step towards this frontier, we present a hydrogeochemical dataset associated with the 2016 Amatrice-Norcia seismic sequence (central Apennines, Italy), developed from August 24(th), with an Mw 6.0 event, and culminating on October 30(th), with an Mw 6.5 mainshock. The seismic sequence occurred during a seasonal depletion of hydrostructures, and the four strongest earthquakes (Mw ≥ 5.5) generated an abrupt uplift of the water level, recorded up to 100 km away from the mainshock area...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28915248/invasion-strategy-and-abiotic-activity-triggers-for-non-native-gobiids-of-the-river-rhine
#10
Jan Baer, Frank Hartmann, Alexander Brinker
The 24 hour activity patterns of three non-native gobiids (round goby Neogobius melanostomus, Western tubenose goby Proterorhinus semilunaris and bighead goby Ponticola kessleri) were assessed over 46 consecutive months between 2011 and 2014 from their occurrence in the cooling water intake of a nuclear power plant on the River Rhine, Germany. In total, 117717 gobiids were identified and classified. The occurrence of all three species varied strongly between sampling years, and species-specific activity triggers were identified...
2017: PloS One
https://www.readbyqxmd.com/read/28915236/modeling-antibiotic-treatment-in-hospitals-a-systematic-approach-shows-benefits-of-combination-therapy-over-cycling-mixing-and-mono-drug-therapies
#11
Burcu Tepekule, Hildegard Uecker, Isabel Derungs, Antoine Frenoy, Sebastian Bonhoeffer
Multiple treatment strategies are available for empiric antibiotic therapy in hospitals, but neither clinical studies nor theoretical investigations have yielded a clear picture when which strategy is optimal and why. Extending earlier work of others and us, we present a mathematical model capturing treatment strategies using two drugs, i.e the multi-drug therapies referred to as cycling, mixing, and combination therapy, as well as monotherapy with either drug. We randomly sample a large parameter space to determine the conditions determining success or failure of these strategies...
September 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28910632/drivers-of-dengue-intrahost-evolution
#12
Etienne Simon-Lorière, Marco Vignuzzi
RNA viruses circulate as rapidly evolving swarms of related variants, and their evolutionary dynamics within hosts may be key to understanding virus emergence. In this issue of Cell Host & Microbe, Parameswaran et al. (2017) combine next-generation sequencing and functional studies to characterize viral populations in acute dengue infections.
September 13, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28904418/leaf-extracts-of-selected-gardening-trees-can-attenuate-quorum-sensing-and-pathogenicity-of-pseudomonas-aeruginosa-pao1
#13
Kaimin Niu, Min Kuk, Haein Jung, Kokgan Chan, Sooki Kim
An increasing concern on resistance to multiple-antibiotics has led to the discovery of novel agents and the establishment of new precaution strategy. Numerous plant sources have been widely studied to reduce virulence of pathogenic bacteria by interfering cell-to-cell based communication called quorum sensing (QS). Leaf extracts of 17 gardening trees were collected and investigated for their anti-QS effects using a sensor strain Chromobacterium violaceum CV026. Methanolic extracts of K4 (Acer palmatum), K9 (Acer pseudosieboldianum) and K13 (Cercis chinensis) leaves were selected for further experiments based on their antagonism effect on QS without inhibiting C...
September 2017: Indian Journal of Microbiology
https://www.readbyqxmd.com/read/28900202/pixelated-checkerboard-metasurface-for-ultra-wideband-radar-cross-section-reduction
#14
Mohammad-Javad Haji-Ahmadi, Vahid Nayyeri, Mohammad Soleimani, Omar M Ramahi
In this paper we designed and fabricated a metasurface working as a radar cross section (RCS) reducer over an ultra wide band of frequency from 3.8 to 10.7 GHz. The designed metasurface is a chessboard-like surface made of alternating tiles, with each tile composed of identical unit cells. We develop a novel, simple, highly robust and fully automated approach for designing the unit cells. First, a topology optimization algorithm is used to engineer the shape of the two unit cells. The area of each unit cell is pixelated...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28898056/pressure-stabilized-semiconducting-electrides-in-alkaline-earth-metal-subnitrides
#15
Yunwei Zhang, Weikang Wu, Yanchao Wang, Shengyuan A Yang, Yanming Ma
High pressure is able to modify profoundly the chemical bonding and generate new phase structures of materials with chemical and physical properties not accessible at ambient conditions. We here report an unprecedented phenomenon on the pressure-induced formation of semiconducting electrides via compression of layered alkaline-earth subnitrides Ca2N, Sr2N and Ba2N that are conducting electrides with loosely confined electrons in the interlayer voids at ambient pressure. Our extensive first-principles swarm structure searches identified the high-pressure semiconducting electride phases of a tetragonal I-42d structure for Ca2N and a monoclinic Cc structure shared by Sr2N and Ba2N, both of which contain atomic-size cavities with paring electrons distributed in...
September 12, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28898046/linking-catalyst-coated-isotropic-colloids-into-active-flexible-chains-enhances-their-diffusivity
#16
Bipul Biswas, Raj Kumar Manna, Abhrajit Laskar, Sunil Kumar P B, Ronojoy Adhikari, Guruswamy Kumaraswamy
Active colloids are not constrained by equilibrium: ballistic propulsion, superdiffusive behaviour or enhanced diffusivities have been reported for active Janus particles. Faster-than-equilibrium dynamics of active systems have implications for their use in drug delivery and micromixing. Further, at high concentrations, interactions between active colloids give rise to complex emergent behaviour. Their collective dynamics result in the formation of several hundred particle-strong flocks or swarms. Here, we demonstrate significant enhancements in diffusivity, comparable to those for active Janus particles, for chemo-mechanically isotropic colloids at very low concentrations...
September 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28894462/a-novel-strategy-for-minimum-attribute-reduction-based-on-rough-set-theory-and-fish-swarm-algorithm
#17
Yuebin Su, Jin Guo
For data mining, reducing the unnecessary redundant attributes which was known as attribute reduction (AR), in particular, reducts with minimal cardinality, is an important preprocessing step. In the paper, by a coding method of combination subset of attributes set, a novel search strategy for minimal attribute reduction based on rough set theory (RST) and fish swarm algorithm (FSA) is proposed. The method identifies the core attributes by discernibility matrix firstly and all the subsets of noncore attribute sets with the same cardinality were encoded into integers as the individuals of FSA...
2017: Computational Intelligence and Neuroscience
https://www.readbyqxmd.com/read/28889205/coupled-monte-carlo-simulation-and-copula-theory-for-uncertainty-analysis-of-multiphase-flow-simulation-models
#18
Xue Jiang, Jin Na, Wenxi Lu, Yu Zhang
Simulation-optimization techniques are effective in identifying an optimal remediation strategy. Simulation models with uncertainty, primarily in the form of parameter uncertainty with different degrees of correlation, influence the reliability of the optimal remediation strategy. In this study, a coupled Monte Carlo simulation and Copula theory is proposed for uncertainty analysis of a simulation model when parameters are correlated. Using the self-adaptive weight particle swarm optimization Kriging method, a surrogate model was constructed to replace the simulation model and reduce the computational burden and time consumption resulting from repeated and multiple Monte Carlo simulations...
September 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28874683/inter-patient-ecg-heartbeat-classification-with-temporal-vcg-optimized-by-pso
#19
Gabriel Garcia, Gladston Moreira, David Menotti, Eduardo Luz
Classifying arrhythmias can be a tough task for a human being and automating this task is highly desirable. Nevertheless fully automatic arrhythmia classification through Electrocardiogram (ECG) signals is a challenging task when the inter-patient paradigm is considered. For the inter-patient paradigm, classifiers are evaluated on signals of unknown subjects, resembling the real world scenario. In this work, we explore a novel ECG representation based on vectorcardiogram (VCG), called temporal vectorcardiogram (TVCG), along with a complex network for feature extraction...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28872119/intravital-microscopy-of-monocyte-homing-and-tumor-related-angiogenesis-in-a-murine-model-of-peripheral-arterial-disease
#20
Martin Wagner, Claudia Baer, Werner Zuschratter, Monika Riek-Burchardt, Christian Deffge, Soenke Weinert, Jerry C Lee, Ruediger C Braun-Dullaeus, Joerg Herold
The therapeutic goal for peripheral arterial disease and ischemic heart disease is to increase blood flow to ischemic areas caused by hemodynamic stenosis. Vascular surgery is a viable option in selected cases, but for patients without indications for surgery such as progression to rest pain, critical limb ischemia, or major disruptions to life or work, there are few possibilities for mitigating their disease. Cell therapy via monocyte-enhanced perfusion through the stimulation of collateral formation is one of a few non-invasive options...
August 26, 2017: Journal of Visualized Experiments: JoVE
keyword
keyword
52032
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"