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https://www.readbyqxmd.com/read/28651326/heterogeneity-in-cultivation-based-monitoring-of-airborne-bacterial-biodiversity-in-animal-farms
#1
Udo Jäckel, Elena Martin, Jenny Schäfer
Diversity analyses of bioaerosol samples from highly loaded workplaces as found in agricultural production or waste management help to improve the knowledge of exposure levels of workers. However, different used methods resulting in the detection of different bacterial species at the same work places. The present study obviously supports the deviation of received results using cultivation and further isolation approaches. Within the present study, the bacterial community at workplaces was estimated using the powerful tool of 16S rRNA gene sequence analyses after cultivation procedure...
June 23, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28651016/enhanced-light-microscopy-visualization-of-virus-particles-from-zika-virus-to-filamentous-ebolaviruses
#2
George G Daaboul, David S Freedman, Steven M Scherr, Erik Carter, Alexandru Rosca, David Bernstein, Chad E Mire, Krystle N Agans, Thomas Hoenen, Thomas W Geisbert, M Selim Ünlü, John H Connor
Light microscopy is a powerful tool in the detection and analysis of parasites, fungi, and prokaryotes, but has been challenging to use for the detection of individual virus particles. Unlabeled virus particles are too small to be visualized using standard visible light microscopy. Characterization of virus particles is typically performed using higher resolution approaches such as electron microscopy or atomic force microscopy. These approaches require purification of virions away from their normal millieu, requiring significant levels of expertise, and can only enumerate small numbers of particles per field of view...
2017: PloS One
https://www.readbyqxmd.com/read/28650824/computing-manhattan-path-difference-mediantrees-a-practical-local-search-approach
#3
Alexey Markin, Oliver Eulenstein
Median tree problems are powerful tools for inferring large-scale phylogenetic trees that hold enormous promise for society at large. Such problems seek a median tree for a given collection of input trees under some problem-specific distance. Here, we introduce a median tree problem under the classic Manhattan path-difference distance. We show that this problem is NP-hard, devise an ILP formulation, and provide an effective local search heuristic that is based on solving a local search problem exactly. Our algorithm for the local search problem improves asymptotically by a factor of n on the best-known (naive) solution, where n is the overall number of taxa in the input trees...
June 22, 2017: IEEE/ACM Transactions on Computational Biology and Bioinformatics
https://www.readbyqxmd.com/read/28650713/occupational-chemical-exposures-a-collaboration-between-the-georgia-poison-center-and-the-occupational-safety-and-health-administration
#4
Aaron W Tustin, Alison Jones, Gaylord P Lopez, Glenn R Ketcham, Michael J Hodgson
CONTEXT: In the United States, regional poison centers frequently receive calls about toxic workplace exposures. Most poison centers do not share call details routinely with governmental regulatory agencies. Worker health and safety could be enhanced if regulators such as the Occupational Safety and Health Administration (OSHA) had the ability to investigate these events and prevent similar incidents. With this goal in mind, the Georgia Poison Center (GPC) began referring occupational exposures to OSHA in July 2014...
June 26, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28650616/cucurbit-6-uril-promoted-click-chemistry-for-protein-modification
#5
Joel A Finbloom, Kenneth Han, Clancy C Slack, Ariel L Furst, Matthew B Francis
Azide-alkyne cycloaddition is a powerful reaction for the formation of bioconjugates. When catalyzed by Cu(I) or strain promotion, this cycloaddition is considered to be a "click" reaction with many applications in chemical biology and materials science. We report a new type of azide-alkyne click chemistry for the synthesis of protein conjugates using cucurbit[6]uril (CB6) supramolecular chemistry. CB6-promoted azide-alkyne cycloaddition has been previously used for the synthesis of rotaxanes, but has not been applied to the development of complex bioconjugates...
June 26, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28650601/multiple-sclerosis-in-an-acupuncture-practice
#6
(no author information available yet)
Multiple sclerosis (MS) is a severe autoimmune demyelinating disease that affects nervous system, has high morbidity and mortality and no effective targeted therapies are available. We present a case of 66-year-old female patient who has been treated by both conventional and Chinese traditional medicine after diagnosis was confirmed in 2008 as MS and antiphospholipid syndrome associated with CNS vasculitis. After diagnosis with clinical image confirmed with CT and MRI scan, where demyelinating zones were present, she started pharmacological therapy without major improvement...
May 26, 2017: Neuro Endocrinology Letters
https://www.readbyqxmd.com/read/28650159/enantioselective-vinylogous-michael-michael-cascade-reactions-of-3-alkylidene-oxindoles-and-nitroolefin-enoates
#7
Junjun Feng, Xin Li
A novel bifunctional squaramide-catalyzed vinylogous Michael-Michael cascade reaction of 3-alkylidene oxindoles with nitroolefin enoates was developed. This convenient, one-pot cascade reaction serves as a powerful tool for the enantioselective construction of potential bioactive chiral chromans, which have three continuous tertiary stereocenters, in moderate to good yields (up to 85%) with excellent stereoselectivities (up to >19:1 dr and >99% ee).
June 26, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28649459/the-study-on-force-surface-integrity-tool-life-and-chip-on-laser-assisted-machining-of-inconel-718-using-nd-yag-laser-source
#8
K Venkatesan
Inconel 718, a high-temperature alloy, is a promising material for high-performance aerospace gas turbine engines components. However, the machining of the alloy is difficult owing to immense shear strength, rapid work hardening rate during turning, and less thermal conductivity. Hence, like ceramics and composites, the machining of this alloy is considered as difficult-to-turn materials. Laser assisted turning method has become a promising solution in recent years to lessen cutting stress when materials that are considered difficult-to-turn, such as Inconel 718 is employed...
July 2017: Journal of Advanced Research
https://www.readbyqxmd.com/read/28649433/on-the-performance-of-de-novo-pathway-enrichment
#9
Richa Batra, Nicolas Alcaraz, Kevin Gitzhofer, Josch Pauling, Henrik J Ditzel, Marc Hellmuth, Jan Baumbach, Markus List
De novo pathway enrichment is a powerful approach to discover previously uncharacterized molecular mechanisms in addition to already known pathways. To achieve this, condition-specific functional modules are extracted from large interaction networks. Here, we give an overview of the state of the art and present the first framework for assessing the performance of existing methods. We identified 19 tools and selected seven representative candidates for a comparative analysis with more than 12,000 runs, spanning different biological networks, molecular profiles, and parameters...
2017: NPJ Systems Biology and Applications
https://www.readbyqxmd.com/read/28649353/genetic-identification-of-source-and-likely-vector-of-a-widespread-marine-invader
#10
Stacy A Krueger-Hadfield, Nicole M Kollars, Allan E Strand, James E Byers, Sarah J Shainker, Ryuta Terada, Thomas W Greig, Mareike Hammann, David C Murray, Florian Weinberger, Erik E Sotka
The identification of native sources and vectors of introduced species informs their ecological and evolutionary history and may guide policies that seek to prevent future introductions. Population genetics provides a powerful set of tools to identify origins and vectors. However, these tools can mislead when the native range is poorly sampled or few molecular markers are used. Here, we traced the introduction of the Asian seaweed Gracilaria vermiculophylla (Rhodophyta) into estuaries in coastal western North America, the eastern United States, Europe, and northwestern Africa by genotyping more than 2,500 thalli from 37 native and 53 non-native sites at mitochondrial cox1 and 10 nuclear microsatellite loci...
June 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28649147/multiblock-high-order-large-eddy-simulation-of-powered-fontan-hemodynamics-towards-computational-surgery
#11
Yann T Delorme, Mark D Rodefeld, Steven H Frankel
Children born with only one functional ventricle must typically undergo a series of three surgeries to obtain the so-called Fontan circulation in which the blood coming from the body passively flows from the Vena Cavae (VCs) to the Pulmonary Arteries (PAs) through the Total Cavopulmonary Connection (TCPC). The circulation is inherently inefficient due to the lack of a subpulmonary ventricle. Survivors face the risk of circulatory sequelae and eventual failure for the duration of their lives. Current efforts are focused on improving the outcomes of Fontan palliation, either passively by optimizing the TCPC, or actively by using mechanical support...
January 17, 2017: Computers & Fluids
https://www.readbyqxmd.com/read/28648761/improved-jpeg-anti-forensics-with-better-image-visual-quality-and-forensic-undetectability
#12
Gurinder Singh, Kulbir Singh
There is an immediate need to validate the authenticity of digital images due to the availability of powerful image processing tools that can easily manipulate the digital image information without leaving any traces. The digital image forensics most often employs the tampering detectors based on JPEG compression. Therefore, to evaluate the competency of the JPEG forensic detectors, an anti-forensic technique is required. In this paper, two improved JPEG anti-forensic techniques are proposed to remove the blocking artifacts left by the JPEG compression in both spatial and DCT domain...
June 10, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28648723/a-protocol-for-the-simultaneous-identification-of-chitin-containing-particles-and-their-associated-bacteria
#13
Florencia Biancalana, Germán A Kopprio, Rubén J Lara, Cecilia Alonso
Chitin is the second most abundant polymer on Earth, playing a crucial role in the biogeochemical cycles. A core issue for studying its processing in aquatic systems is the identification and enumeration of chitin-containing particles and organisms, ideally in a manner that can be directly linked to bulk chitin quantification. The aim of this study was the development of such a technique. We successfully combined the methodology of bulk chitin determination using wheat germ agglutinin (FITC-WGA) for staining chitin-containing particles and organisms along with CARD-FISH staining of either chitin-containing eukaryotic cells or bacteria associated with them...
June 7, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28648677/cell-type-specific-transcriptome-profiling-in-c-elegans-using-the-translating-ribosome-affinity-purification-technique
#14
Xicotencatl Gracida, John A Calarco
Organs and specific cell types execute specialized functions in multicellular organisms, in large part through customized gene expression signatures. Thus, profiling the transcriptomes of specific cell and tissue types remains an important tool for understanding how cells become specialized. Methodological approaches to detect gene expression differences have utilized samples from whole animals, dissected tissues, and more recently single cells. Despite these advances, there is still a challenge and a need in most laboratories to implement less invasive yet powerful cell-type specific transcriptome profiling methods...
June 22, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28648044/dendrons-and-multiarm-polymers-with-thiol-exchangeable-cores-a-reversible-conjugation-platform-for-delivery
#15
Ozgul Gok, Pelin Erturk, Burcu Sumer Bolu, Tugce Nihal Gevrek, Rana Sanyal, Amitav Sanyal
Disulfide exchange reaction has emerged as a powerful tool for reversible conjugation of proteins, peptides and thiol containing molecules to polymeric supports. In particular, the pyridyl disulfide group provides an efficient handle for the site-specific conjugation of therapeutic peptides and proteins bearing cysteine moieties. In this study, novel biodegradable dendritic platforms containing a pyridyl disulfide unit at their focal point were designed. Presence of hydroxyl groups at the periphery of these dendrons allows their elaboration to multivalent initiators that yield poly(ethylene glycol) based multiarm star polymers via controlled radical polymerization...
June 24, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28647561/identification-of-a-novel-splicing-mutation-within-slc17a8-in-a-korean-family-with-hearing-loss-by-whole-exome-sequencing
#16
Nari Ryu, Seokwon Lee, Hong-Joon Park, Byeonghyeon Lee, Tae-Jun Kwon, Jinwoong Bok, Chan Ik Park, Kyu-Yup Lee, Jeong-In Baek, Un-Kyung Kim
Hereditary hearing loss (HHL) is a common genetically heterogeneous disorder, which follows Mendelian inheritance in humans. Because of this heterogeneity, the identification of the causative gene of HHL by linkage analysis or Sanger sequencing have shown economic and temporal limitations. With recent advances in next-generation sequencing (NGS) techniques, rapid identification of a causative gene via massively parallel sequencing is now possible. We recruited a Korean family with three generations exhibiting autosomal dominant inheritance of HL, and the clinical information about this family revealed that there are no other symptoms accompanied with HL...
June 21, 2017: Gene
https://www.readbyqxmd.com/read/28647514/aqueous-cigarette-tar-extracts-disrupt-corticogenesis-from-human-embryonic-stem-cells-in-vitro
#17
Aynun N Begum, Jose S Aguilar, Yiling Hong
BACKGROUND: Cigarette butts are the most common form of litter in the world, and approximately 4.5 trillion smoked cigarettes are discarded every year worldwide. Cigarette butts contain over 4000 chemicals, many of which are known to have neurotoxic effects. Stem cell neuronal differentiation provides an excellent cellular model with which to examine the impact of aqueous cigarette tar extracts (ACTEs) on neurodevelopment. METHODS: We have developed a neurosphere-based stem cell neuronal differentiation protocol that can recapitulate corticogenesis and produce cell types that are similar to upper and lower layer cortical projection neurons found in the germinal zone of the developing human cortex...
June 22, 2017: Environmental Research
https://www.readbyqxmd.com/read/28647433/targeted-release-of-transcription-factors-for-human-cell-reprogramming-by-zebra-cell-penetrating-peptide
#18
Benjamin Caulier, Lionel Berthoin, Helène Coradin, Frédéric Garban, Marie Claire Dagher, Benoît Polack, Bertrand Toussaint, Jean Luc Lenormand, David Laurin
Transcription factors (TFs) are key actors of the control of gene expression and consequently of every major process within cells, ranging from cell fate determination, cell cycle control and response to environment. Their ectopic expression has proven high potential in reprogramming cells for regenerative medicine; ontogenesis studies and cell based modelling. Direct delivery of proteins could represent an alternative to current reprogramming methods using gene transfer but still needs technological improvements...
June 21, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28647021/reprint-of-minimizing-noise-in-pediatric-task-based-functional-mri-adolescents-with-developmental-disabilities-and-typical-development
#19
Catherine Fassbender, Prerona Mukherjee, Julie B Schweitzer
Functional Magnetic Resonance Imaging (fMRI) represents a powerful tool with which to examine brain functioning and development in typically developing pediatric groups as well as children and adolescents with clinical disorders. However, fMRI data can be highly susceptible to misinterpretation due to the effects of excessive levels of noise, often related to head motion. Imaging children, especially with developmental disorders, requires extra considerations related to hyperactivity, anxiety and the ability to perform and maintain attention to the fMRI paradigm...
July 1, 2017: NeuroImage
https://www.readbyqxmd.com/read/28646939/hounsfield-units-for-nephrolithiasis-predictive-power-for-the-clinical-urologist
#20
Andrew Cohen, Blake Anderson, Glenn Gerber
INTRODUCTION: We aim to determine the optimal method for measuring Hounsfield Units (HU) of calculi for the clinical urologist. MATERIALS AND METHODS: We present a single institution prospective study from 2014-2015 for 125 consecutive patients. Demographics, baseline characteristics, imaging, and stone analysis were collected. CT scanners and settings were heterogeneous. Hounsfield units were measured by use of ellipsoid tool and free hand outline by two independent urology graders using Philips iSite PACs...
June 2017: Canadian Journal of Urology
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