keyword
MENU ▼
Read by QxMD icon Read
search

Parallel processing

keyword
https://www.readbyqxmd.com/read/28634438/computational-models-of-anterior-cingulate-cortex-at-the-crossroads-between-prediction-and-effort
#1
Eliana Vassena, Clay B Holroyd, William H Alexander
In the last two decades the anterior cingulate cortex (ACC) has become one of the most investigated areas of the brain. Extensive neuroimaging evidence suggests countless functions for this region, ranging from conflict and error coding, to social cognition, pain and effortful control. In response to this burgeoning amount of data, a proliferation of computational models has tried to characterize the neurocognitive architecture of ACC. Early seminal models provided a computational explanation for a relatively circumscribed set of empirical findings, mainly accounting for EEG and fMRI evidence...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28634437/latent-growth-curve-models-for-biomarkers-of-the-stress-response
#2
REVIEW
John M Felt, Sarah Depaoli, Jitske Tiemensma
Objective: The stress response is a dynamic process that can be characterized by predictable biochemical and psychological changes. Biomarkers of the stress response are typically measured over time and require statistical methods that can model change over time. One flexible method of evaluating change over time is the latent growth curve model (LGCM). However, stress researchers seldom use the LGCM when studying biomarkers, despite their benefits. Stress researchers may be unaware of how these methods can be useful...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28633097/results-of-the-first-international-hiv-1-coreceptor-proficiency-panel-test
#3
Eva Heger, Rolf Kaiser, Elena Knops, Maria Neumann-Fraune, Eugen Schuelter, Alejandro Pironti, Thomas Lengauer, Hauke Walter, Saleta Sierra
BACKGROUND: Quality Assurance (QA) programs are essential to evaluate performance in diagnostics laboratories. OBJECTIVES: We present the results from the first QA for HIV-1 genotypic tropism testing, organized and coordinated by the Institute of Virology at the University of Cologne. STUDY DESIGN: 12 cell culture-derived viral strains of different HIV-1 clades from the NIH AIDS Reagent Program were sent to the participants to be processed with their standard diagnostic methods Fasta files containing the V3 region sequence were centrally analyzed at the Institute of Virology, Cologne...
June 10, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28632962/a-novel-minimally-invasive-wireless-technology-for-neuromodulation-via-percutaneous-intercostal-nerve-stimulation-pns-for-post-herpetic-neuralgia-a-case-report-with-short-term-follow-up
#4
Bart Billet, Roel Wynendaele, Niek E Vanquathem
BACKGROUND: Peripheral nerve stimulation (PNS) of primary afferent neurons provides control of localized chronic pain. This technique applies permanent electrical stimulation at the target area via a minimally invasive, subcutaneous placement of an electrode. OBJECTIVE: To assess analgesic effects of a minimally invasive wireless neuromodulation in the treatment of chronic intractable pain secondary to post-herpetic neuralgia. CASE SUMMARY: A 78-year-old man presented with severe intractable post herpetic neuralgic pain...
June 20, 2017: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/28632757/molecular-mechanism-of-drp1-assembly-studied-in-vitro-by-cryo-electron-microscopy
#5
Kaustuv Basu, Driss Lajoie, Tristan Aumentado-Armstrong, Jin Chen, Roman I Koning, Blaise Bossy, Mihnea Bostina, Attila Sik, Ella Bossy-Wetzel, Isabelle Rouiller
Mitochondria are dynamic organelles that continually adapt their morphology by fusion and fission events. An imbalance between fusion and fission has been linked to major neurodegenerative diseases, including Huntington's, Alzheimer's, and Parkinson's diseases. A member of the Dynamin superfamily, dynamin-related protein 1 (DRP1), a dynamin-related GTPase, is required for mitochondrial membrane fission. Self-assembly of DRP1 into oligomers in a GTP-dependent manner likely drives the division process. We show here that DRP1 self-assembles in two ways: i) in the presence of the non-hydrolysable GTP analog GMP-PNP into spiral-like structures of ~36 nm diameter; and ii) in the presence of GTP into rings composed of 13-18 monomers...
2017: PloS One
https://www.readbyqxmd.com/read/28632332/microscale-disruption-of-microorganisms-for-parallelized-process-development
#6
REVIEW
Cornelia Walther, Astrid Dürauer
Escherichia coli, Saccharomyces cerevisiae, and Pichia pastoris are the standard platforms for biopharmaceutical production with 40% of all between 2010 to 2014 approved protein drugs produced in those microbial hosts. Typically, products overexpressed E. coli and S. cerevisiae remain in the cytosol or are secreted into the periplasm. Consequently, efficient cell disruption is essential for high product recovery during microbial production. Process development platforms at microscale are essential to shorten time to market...
June 20, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28632200/the-beginning-and-development-of-the-theranostic-approach-in-nuclear-medicine-as-exemplified-by-the-radionuclide-pair-86-y-and-90-y
#7
Frank Rösch, Hans Herzog, Syed M Qaim
In the context of radiopharmacy and molecular imaging, the concept of theranostics entails a therapy-accompanying diagnosis with the aim of a patient-specific treatment. Using the adequate diagnostic radiopharmaceutical, the disease and the state of the disease are verified for an individual patient. The other way around, it verifies that the radiopharmaceutical in hand represents a target-specific and selective molecule: the "best one" for that individual patient. Transforming diagnostic imaging into quantitative dosimetric information, the optimum radioactivity (expressed in maximum radiation dose to the target tissue and tolerable dose to healthy organs) of the adequate radiotherapeutical is applied to that individual patient...
June 20, 2017: Pharmaceuticals
https://www.readbyqxmd.com/read/28631441/genetic-landscape-and-deregulated-pathways-in-b-cell-lymphoid-malignancies
#8
R Rosenquist, S Beà, M-Q Du, B Nadel, Q Pan-Hammarström
With the introduction of next-generation sequencing, the genetic landscape of the complex group of B-cell lymphoid malignancies has rapidly been unravelled in recent years. This has provided important information about recurrent genetic events and identified key pathways deregulated in each lymphoma subtype. In parallel, there has been intense search and development of novel types of targeted therapy that 'hit' central mechanisms in lymphoma pathobiology, such as BTK, PI3K or BCL2 inhibitors. In this review, we will outline the current view of the genetic landscape of selected entities: follicular lymphoma, diffuse large B-cell lymphoma, mantle cell lymphoma, chronic lymphocytic leukaemia and marginal zone lymphoma...
June 20, 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28631149/vigor-of-survival-determinism-subtle-evolutionary-gradualism-interspersed-with-robust-phylogenetic-leaping
#9
Pavle Krsmanovic
Discussions of the survival determinism concept have previously focused on its primary role in the evolution of early unicellular organisms in the light of findings which have been reported on a number of diseases. The rationale for such parallel was in the view according to which multicellular organisms could be regarded as sophisticated colonies of semi-autonomous, single-celled entities, whereby various diseases were described as conditions arising upon the activation of the respective survival mechanisms in a milieu unsuitable for such robust stress response...
June 19, 2017: Theory in Biosciences, Theorie in Den Biowissenschaften
https://www.readbyqxmd.com/read/28629355/biologically-constrained-optimization-based-cell-membrane-segmentation-in-c-elegans-embryos
#10
Yusuke Azuma, Shuichi Onami
BACKGROUND: Recent advances in bioimaging and automated analysis methods have enabled the large-scale systematic analysis of cellular dynamics during the embryonic development of Caenorhabditis elegans. Most of these analyses have focused on cell lineage tracing rather than cell shape dynamics. Cell shape analysis requires cell membrane segmentation, which is challenging because of insufficient resolution and image quality. This problem is currently solved by complicated segmentation methods requiring laborious and time consuming parameter adjustments...
June 19, 2017: BMC Bioinformatics
https://www.readbyqxmd.com/read/28629254/the-yin-and-yang-of-the-adrenal-and-gonadal-systems-in-elite-military-men
#11
Marcus K Taylor, Lisa M Hernández, Shiloah A Kviatkovsky, Matthew R Schoenherr, Michael S Stone, Paul Sargent
We recently established daily, free-living profiles of the adrenal hormone cortisol, the (primarily adrenal) anabolic precursor dehydroepiandrosterone (DHEA) and the (primarily gonadal) anabolic hormone testosterone in elite military men. A prevailing view is that adrenal and gonadal systems reciprocally modulate each other; however, recent paradigm shifts prompted the characterization of these systems as parallel, cooperative processes (i.e. the "positive coupling" hypothesis). In this study, we tested the positive coupling hypothesis in 57 elite military men by evaluating associations between adrenal and gonadal biomarkers across the day...
June 19, 2017: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/28628742/acceleration-of-semiempirical-qm-mm-methods-through-mpi-hybrid-mpi-openmp-and-scf-accelerator-implementations
#12
Pedro Ojeda-May, Kwangho Nam
The present manuscript describes the strategy and implementation of scalable and efficient semiempirical (SE) QM/MM methods in CHARMM. The serial version of the code was first profiled to identify routines that require parallelization. Afterwards, the code was parallelized and accelerated with three approaches. The first approach was the parallelization of the entire QM/MM routines, including the Fock matrix diagonalization routines, using the CHARMM MPI machinery. In the second approach, two different self-consistent field (SCF) energy convergence accelerators were implemented using density and Fock matrices as targets for their extrapolations in the SCF procedure...
June 19, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28628004/visual-field-map-clusters-in-human-frontoparietal-cortex
#13
Wayne E Mackey, Jonathan Winawer, Clayton E Curtis
The visual neurosciences have made enormous progress in recent decades, in part because of the ability to drive visual areas by their sensory inputs, allowing researchers to reliably define visual areas across individuals and across species. Similar strategies for parcellating higher-order cortex have proven elusive. Here, using a novel experimental task and nonlinear population receptive field modeling we map and characterize the topographic organization of several regions in human frontoparietal cortex. We discover representations of both polar angle and eccentricity that are organized into clusters, similar to visual cortex, where multiple gradients of polar angle of the contralateral visual field share a confluent fovea...
June 19, 2017: ELife
https://www.readbyqxmd.com/read/28627786/the-north-african-middle-stone-age-and-its-place-in-recent-human-evolution
#14
Eleanor M L Scerri
The North African Middle Stone Age (NAMSA, ∼300-24 thousand years ago, or ka) features what may be the oldest fossils of our species as well as extremely early examples of technological regionalization and 'symbolic' material culture (d'Errico, Vanhaeren, Barton, Bouzouggar, Mienis, Richter, Hublin, McPherron, Louzouet, & Klein, ; Scerri, ; Richter, Grün, Joannes-Boyau, Steele, Amani, Rué, Fernandes, Raynal, Geraads, Ben-Ncer Hublin, McPherron, ). The geographic situation of North Africa and an increased understanding of the wet-dry climatic pulses of the Sahara Desert also show that North Africa played a strategic role in continental-scale evolutionary processes by modulating human dispersal and demographic structure (Drake, Blench, Armitage, Bristow, & White, ; Blome, Cohen, Tryon, Brooks, & Russell, )...
May 2017: Evolutionary Anthropology
https://www.readbyqxmd.com/read/28627356/aquatic-therapy-for-children-with-duchenne-muscular-dystrophy-a-pilot-feasibility-randomised-controlled-trial-and-mixed-methods-process-evaluation
#15
Daniel Hind, James Parkin, Victoria Whitworth, Saleema Rex, Tracey Young, Lisa Hampson, Jennie Sheehan, Chin Maguire, Hannah Cantrill, Elaine Scott, Heather Epps, Marion Main, Michelle Geary, Heather McMurchie, Lindsey Pallant, Daniel Woods, Jennifer Freeman, Ellen Lee, Michelle Eagle, Tracey Willis, Francesco Muntoni, Peter Baxter
BACKGROUND: Duchenne muscular dystrophy (DMD) is a rare disease that causes the progressive loss of motor abilities such as walking. Standard treatment includes physiotherapy. No trial has evaluated whether or not adding aquatic therapy (AT) to land-based therapy (LBT) exercises helps to keep muscles strong and children independent. OBJECTIVES: To assess the feasibility of recruiting boys with DMD to a randomised trial evaluating AT (primary objective) and to collect data from them; to assess how, and how well, the intervention and trial procedures work...
May 2017: Health Technology Assessment: HTA
https://www.readbyqxmd.com/read/28627331/dynamic-transmit-receive-beamforming-by-spatial-matched-filtering-for-ultrasound-imaging-with-plane-wave-transmission
#16
Yuling Chen, Yang Lou, Jesse Yen
During conventional ultrasound imaging, the need for multiple transmissions for one image and the time of flight for a desired imaging depth limit the frame rate of the system. Using a single plane wave pulse during each transmission followed by parallel receive processing allows for high frame rate imaging. However, image quality is degraded because of the lack of transmit focusing. Beamforming by spatial matched filtering (SMF) is a promising method which focuses ultrasonic energy using spatial filters constructed from the transmit-receive impulse response of the system...
July 2017: Ultrasonic Imaging
https://www.readbyqxmd.com/read/28626017/amyloid-beta-peptide-is-needed-for-cgmp-induced-long-term-potentiation-and-memory
#17
Agostino Palmeri, Roberta Ricciarelli, Walter Gulisano, Daniela Rivera, Claudia Rebosio, Elisa Calcagno, Maria Rosaria Tropea, Silvia Conti, Utpal Das, Subhojit Roy, Maria A Pronzato, Ottavio Arancio, Ernesto Fedele, Daniela Puzzo
High levels of amyloid-beta peptide (Aβ) have been related to Alzheimer's disease pathogenesis. However, in the healthy brain, low physiologically relevant concentrations of Aβ are necessary for long-term potentiation (LTP) and memory. Because cGMP plays a key role in these processes, here we investigated whether the cyclic nucleotide cGMP influences Aβ levels and function during LTP and memory. We demonstrate that the increase of cGMP levels by the phosphodiesterase-5 inhibitors (PDE5-Is) sildenafil and vardenafil induces a parallel release of Aβ due to a change in the approximation of amyloid precursor protein (APP) and the β-site APP cleaving enzyme 1 (BACE1)...
June 16, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28625982/the-novel-stress-survival-islet-2-ssi-2-predominantly-present-in-listeria-monocytogenes-strains-of-st121-is-involved-in-alkaline-and-oxidative-stress-response
#18
Eva Harter, Eva Maria Wagner, Andreas Zaiser, Sabrina Halecker, Martin Wagner, Kathrin Rychli
The food-borne pathogen Listeria (L) monocytogenes is able to survive a variety of stress conditions leading to the colonization of different niches like the food processing environment. This study focuses on the hypervariable genetic hotspot lmo0443-lmo0449 haboring three inserts: the stress survival islet 1 (SSI-1), the single-gene insert LMOf2365_0481 and two homologous genes of the non-pathogenic species L. innocua: lin0464, a putative transcriptional regulator and lin0465, an intracellular PfpI protease...
June 16, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28625159/dna-extraction-for-streamlined-metagenomics-of-diverse-environmental-samples
#19
Clarisse Marotz, Amnon Amir, Greg Humphrey, James Gaffney, Grant Gogul, Rob Knight
A major bottleneck for metagenomic sequencing is rapid and efficient DNA extraction. Here, we compare the extraction efficiencies of three magnetic bead-based platforms (KingFisher, epMotion, and Tecan) to a standardized column-based extraction platform across a variety of sample types, including feces, oral, skin, soil, and water. Replicate sample plates were extracted and prepared for 16S rRNA gene amplicon sequencing in parallel to assess extraction bias and DNA quality. The data demonstrate that any effect of extraction method on sequencing results was small compared with the variability across samples; however, the KingFisher platform produced the largest number of high-quality reads in the shortest amount of time...
June 1, 2017: BioTechniques
https://www.readbyqxmd.com/read/28625108/memory-dynamics-under-stress
#20
Conny W E M Quaedflieg, Lars Schwabe
Stressful events have a major impact on memory. They modulate memory formation in a time-dependent manner, closely linked to the temporal profile of action of major stress mediators, in particular catecholamines and glucocorticoids. Shortly after stressor onset, rapidly acting catecholamines and fast, non-genomic glucocorticoid actions direct cognitive resources to the processing and consolidation of the ongoing threat. In parallel, control of memory is biased towards rather rigid systems, promoting habitual forms of memory allowing efficient processing under stress, at the expense of "cognitive" systems supporting memory flexibility and specificity...
June 19, 2017: Memory
keyword
keyword
94192
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"