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https://www.readbyqxmd.com/read/28637348/hydrogen-peroxide-sensing-based-on-inner-surfaces-modification-of-solid-state-nanopore
#1
Libo Zhu, Dejian Gu, Quanjun Liu
There are many techniques for the detection of molecules. But detection of molecules through solid-state nanopore in a solution is one of the promising, high-throughput, and low-cost technology used these days. In the present investigation, a solid-state nanopore platform was fabricated for the detection of hydrogen peroxide (H2O2), which is not only a label free product but also a significant participant in the redox reaction. We have successfully fabricated silicon nitride (Si3N4) nanopores with diameters of ~50 nm by using a focused Ga ion beam, the inner surface of the nanopore has been modified with horseradish peroxidase (HRP) by employing carbodiimide coupling chemistry...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28637164/biological-nutrient-removal-and-molecular-biological-characteristics-in-an-anaerobic-multistage-anaerobic-oxic-a-mao-process-to-treat-municipal-wastewater
#2
Xiao Huang, Wenyi Dong, Hongjie Wang, Shilong Jiang
This study aimed to present an anaerobic-multistage anaerobic/oxic (A-MAO) process to treat municipal wastewater. The average COD, NH4(+)-N, TN, and TP removal efficiency were 91.81%, 96.26%, 83.73% and 94.49%, respectively. Temperature plunge and C/N decrease have a certain impact on the modified process. Characteristics of microbial community, function microorganism, and correlation of microbial community with environmental variables in five compartments were carried out by Illumina Miseq high-throughput sequencing...
May 29, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28636980/a-multiplex-liquid-chip-assay-based-on-luminex-xmap-technology-for-simultaneous-detection-of-six-common-respiratory-viruses
#3
Yong Yan, Jian-Yong Luo, Yin Chen, Heng-Hui Wang, Guo-Ying Zhu, Pei-Yan He, Jin-Lei Guo, Yong-Liang Lei, Zhong-Wen Chen
We utilized one-step multiplex reverse transcription-PCR (RT-PCR) and Luminex xMAP technology to develop a respiratory multiplex liquid-chip assay (rMLA) for simultaneous detection of 6 common respiratory viruses, including influenza virus type A (FluA) and type B (FluB), para-influenza virus type 3 (PIV-3), respiratory syncytial virus (RSV), human metapneumovirus (MPV) and a threatening virus to China, Middle East Respiratory Syndrome coronavirus (MERS-CoV). Performance of rMLA was evaluated by comparing with real-time RT-PCR...
June 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/28636905/a-kepler-workflow-tool-for-reproducible-amber-gpu-molecular-dynamics
#4
Shweta Purawat, Pek U Ieong, Robert D Malmstrom, Garrett J Chan, Alan K Yeung, Ross C Walker, Ilkay Altintas, Rommie E Amaro
With the drive toward high throughput molecular dynamics (MD) simulations involving ever-greater numbers of simulation replicates run for longer, biologically relevant timescales (microseconds), the need for improved computational methods that facilitate fully automated MD workflows gains more importance. Here we report the development of an automated workflow tool to perform AMBER GPU MD simulations. Our workflow tool capitalizes on the capabilities of the Kepler platform to deliver a flexible, intuitive, and user-friendly environment and the AMBER GPU code for a robust and high-performance simulation engine...
June 20, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28636808/diversity-and-abundance-of-human-pathogenic-fungi-associated-with-pigeon-feces-in-urban-environments
#5
Won Dong Lee, Jonathan J Fong, John A Eimes, Young Woon Lim
Pathogenic fungi are a growing health concern worldwide, particularly in large, densely populated cities. The dramatic upsurge of pigeon populations in cities has been implicated in the increased incidence of invasive fungal infections. In the current study, we used a culture-independent, high-throughput sequencing approach to describe the diversity of clinically relevant fungi (CRF) associated with pigeon feces and map the relative abundance of CRF across Seoul, Korea. In addition, we tested whether certain geographical, sociological, and meteorological factors were significantly associated with the diversity and relative abundance of CRF...
June 21, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28636670/identification-of-novel-small-molecules-that-inhibit-stat3-dependent-transcription-and-function
#6
Iryna Kolosenko, Yasmin Yu, Sander Busker, Matheus Dyczynski, Jianping Liu, Martin Haraldsson, Caroline Palm Apergi, Thomas Helleday, Katja Pokrovskaja Tamm, Brent D G Page, Dan Grander
Activation of Signal Transducer and Activator of Transcription 3 (STAT3) has been linked to several processes that are critical for oncogenic transformation, cancer progression, cancer cell proliferation, survival, drug resistance and metastasis. Inhibition of STAT3 signaling has shown a striking ability to inhibit cancer cell growth and therefore, STAT3 has become a promising target for anti-cancer drug development. The aim of this study was to identify novel inhibitors of STAT-dependent gene transcription...
2017: PloS One
https://www.readbyqxmd.com/read/28636659/retraction-a-high-throughput-screening-compatible-strategy-for-the-identification-of-inositol-pyrophosphate-kinase-inhibitors
#7
Brandi M Baughman, Huanchen Wang, Yi An, Dmitri Kireev, Michael A Stashko, Henning J Jessen, Kenneth H Pearce, Stephen V Frye, Stephen B Shears
No abstract text is available yet for this article.
2017: PloS One
https://www.readbyqxmd.com/read/28636348/the-development-of-an-aryloxazole-class-of-hepatitis-c-virus-inhibitors-targeting-the-entry-stage-of-the-viral-replication-cycle
#8
Shanshan He, Kelin Li, Billy Lin, Zonyi Hu, Jingbo Xiao, Xin Hu, Amy Q Wang, Xin Xu, Marc Ferrer, Noel Southall, Wei Zheng, Jeffrey Aubé, Frank J Schoenen, Juan J Marugan, T Jake Liang, Kevin J Frankowski
Reliance on hepatitis C virus (HCV) replicon systems and protein-based screening assays has led to treatments that target HCV viral replication proteins. The model does not encompass other viral replication cycle steps, such as entry, processing, assembly and secretion, or viral host factors. We previously applied a phenotypic high-throughput screening platform based on an infectious HCV system and discovered an aryloxazole-based anti-HCV hit. Structure-activity relationship studies revealed several compounds exhibiting EC50 values below 100 nM...
June 21, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28636327/maldi-ms-guided-liquid-microjunction-extraction-for-ce-esi-ms-analysis-of-single-pancreatic-islet-cells
#9
Troy J Comi, Monika A Makurath, Marina C Philip, Stanislav S Rubakhin, Jonathan V Sweedler
The ability to characterize chemical heterogeneity in biological structures is essential to understanding cellular level function in both healthy and diseased states, but these variations remain difficult to assess using a single analytical technique. While mass spectrometry (MS) provides sufficient sensitivity to measure many analytes from volume-limited samples, each type of mass spectrometric analysis uncovers only a portion of the complete chemical profile of a single cell. Matrix-assisted laser desorp-tion/ionization (MALDI) MS and capillary electrophoresis electrospray ionization (CE-ESI)-MS are complementary analytical platforms frequently utilized for single cell analysis...
June 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28636311/insights-into-integrated-lead-generation-and-target-identification-in-malaria-and-tuberculosis-drug-discovery
#10
John Okombo, Kelly Chibale
New, safe and effective drugs are urgently needed to treat and control malaria and tuberculosis, which affect millions of people annually. However, financial return on investment in the poor settings where these diseases are mostly prevalent is very minimal to support market-driven drug discovery and development. Moreover, the imminent loss of therapeutic lifespan of existing therapies due to evolution and spread of drug resistance further compounds the urgency to identify novel effective drugs. However, the advent of new public-private partnerships focused on tropical diseases and the recent release of large data sets by pharmaceutical companies on antimalarial and antituberculosis compounds derived from phenotypic whole cell high throughput screening have spurred renewed interest and opened new frontiers in malaria and tuberculosis drug discovery...
June 21, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28636268/high-throughput-sequencing-reveals-drosophila-suzukii-responses-to-insecticides
#11
Ruchir Mishra, Joanna C Chiu, Gang Hua, Nilesh R Tawari, Michael J Adang, Ashfaq A Sial
Global climate change and acquired resistance to insecticides are threats to world food security. Drosophila suzukii, a devastating invasive pest in many parts of the world, causes substantial economic losses to fruit production industries, forcing farmers to apply broad-spectrum insecticides frequently. This could lead to the development of insecticide resistance. We determined the Lethal Concentration50 (median lethal concentration) values of zeta-cypermethrin, spinosad, and malathion insecticides against D...
June 21, 2017: Insect Science
https://www.readbyqxmd.com/read/28634847/carbon-nanotubes-embedded-in-embryoid-bodies-direct-cardiac-differentiation
#12
Samad Ahadian, Shukuyo Yamada, Mehdi Estili, Xiaobin Liang, Ramin Banan Sadeghian, Ken Nakajima, Hitoshi Shiku, Tomokazu Matsue, Ali Khademhosseini
We embedded carbon nanotubes (CNTs) in mouse embryoid bodies (EBs) for modulating mechanical and electrical cues of the stem cell niche. The CNTs increased the mechanical integrity and electrical conductivity of the EBs. Measured currents for the unmodified EBs (hereafter, EBs) and the EBs-0.25 mg/mL CNTs were 0.79 and 26.3 mA, respectively, at voltage of 5 V. The EBs had a Young's modulus of 20.9 ± 6.5 kPa, whereas the Young's modulus of the EB-0.1 mg/mL CNTs was 35.2 ± 5.6 kPa. The EB-CNTs also showed lower proliferation and greater differentiation rates compared with the EBs as determined by the expression of pluripotency genes and the analysis of EB sizes...
September 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28634762/rapid-preconcentration-of-viable-bacteria-using-magnetic-ionic-liquids-for-pcr-amplification-and-culture-based-diagnostics
#13
Kevin D Clark, Jeffrey A Purslow, Stephen A Pierson, Omprakash Nacham, Jared L Anderson
In this study, a series of magnetic ionic liquids (MILs) were investigated for the extraction and preconcentration of bacteria from aqueous samples. By dispersing small volumes (e.g., 15 μL) of MIL within an aqueous cell suspension, bacteria were rapidly extracted and isolated using a magnetic field. Of the seven hydrophobic MILs examined, the trihexyl(tetradecyl)phosphonium Ni(II) hexafluoroacetylacetonate ([P66614(+)][Ni(hfacac)3(-)]) MIL exhibited the greatest enrichment of viable Escherichia coli K12 when coupled with microbiological culture as the detection method...
June 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28634756/a-high-throughput-targeted-and-non-targeted-method-for-the-analysis-of-microcystins-and-anatoxin-a-using-on-line-solid-phase-extraction-coupled-to-liquid-chromatography-quadrupole-time-of-flight-high-resolution-mass-spectrometry
#14
Xavier Ortiz, Eva Korenkova, Karl J Jobst, Karen A MacPherson, Eric J Reiner
Microcystins are cyclic heptapeptide hepatotoxins produced by cyanobacteria in freshwater. Sample preparation for the analysis of these cyanotoxins in water from algal blooms can take up to several days due to the matrix complexity and the low detection limits required to comply with current legislation. Moreover, there is a large number of unknown microcystins that could potentially exist in the environment resulting from different amino acid substitutions into the microcystin skeletal structure. To tackle these problems, the present study involved the development of a high throughput method based on on-line solid phase extraction coupled to liquid chromatography that could provide quantitative results for 12 microcystin variants (LR, YR, RR, HtyR, HilR, WR, LW, LA, LF, LY, Dha(7)-LR, and Dha(7)-RR) and anatoxin-A in less than 3 h with detection limits between 0...
June 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28634607/a-high-throughput-microfluidic-platform-for-size-selective-enrichment-of-cell-populations-in-tissue-and-blood-samples
#15
Nivedita Nivedita, Neha Garg, Abraham P Lee, Ian Papautsky
Numerous applications in biology and medicine require the efficient and reliable separation of cells for disease diagnosis, genetic analysis, drug screening, and therapeutics. In this work, we demonstrate a novel technology that integrates a passive and an active device to separate, enrich and release cells on-demand from a complex blood sample, or cancer cells derived from a tissue biopsy. We exploit the high throughput (>1 mL min(-1)), size-based sorting capability of the passive spiral inertial microfluidic (iMF) device to focus particles/cells towards an active lateral cavity acoustic transducer (LCAT) device for size-selective enrichment...
June 21, 2017: Analyst
https://www.readbyqxmd.com/read/28634339/effective-synthesis-of-highly-oxidized-graphene-oxide-that-enables-wafer-scale-nanopatterning-preformed-acidic-oxidizing-medium-approach
#16
Chun-Hu Chen, Shin Hu, Jyun-Fu Shih, Chang-Ying Yang, Yun-Wen Luo, Ren-Huai Jhang, Chao-Ming Chiang, Yung-Jr Hung
Demand for rapid and massive-scale exfoliation of bulky graphite remains high in graphene commercialization and property manipulation. We report a procedure utilizing "preformed acidic oxidizing medium (PAOM)" as a modified version of the Hummers' method for fast and reliable synthesis of graphene oxide. Pre-mixing of KMnO4 and concentrated H2SO4 prior to the addition of graphite flakes enables the formation of effectively and efficiently oxidized graphene oxide (EEGO) featured by its high yields and suspension homogeneity...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28634292/monte-carlo-sampling-for-stochastic-weight-functions
#17
Daan Frenkel, K Julian Schrenk, Stefano Martiniani
Conventional Monte Carlo simulations are stochastic in the sense that the acceptance of a trial move is decided by comparing a computed acceptance probability with a random number, uniformly distributed between 0 and 1. Here, we consider the case that the weight determining the acceptance probability itself is fluctuating. This situation is common in many numerical studies. We show that it is possible to construct a rigorous Monte Carlo algorithm that visits points in state space with a probability proportional to their average weight...
June 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28634160/high-throughput-characterization-of-cascade-type-i-e-crispr-guide-efficacy-reveals-unexpected-pam-diversity-and-target-sequence-preferences
#18
Becky Xu Hua Fu, Michael Wainberg, Anshul Kundaje, Andrew Z Fire
Interactions between Clustered Regularly Interspaced Short Palindromic Repeat (CRISPR) RNAs and CRISPR-associated (Cas) proteins form an RNA-guided adaptive immune system in prokaryotes. The adaptive immune system utilizes segments of the genetic material of invasive foreign elements in the CRISPR locus. The loci are transcribed and processed to produce small CRISPR RNAs (crRNAs), with degradation of invading genetic material directed by a combination of complementarity between RNA and DNA and in some cases recognition of adjacent motifs called PAMs (Protospacer Adjacent Motifs)...
June 20, 2017: Genetics
https://www.readbyqxmd.com/read/28634068/investigation-of-changes-in-endocannabinoids-and-n-acylethanolamides-in-biofluids-and-their-correlations-with-female-infertility
#19
Jun Ding, Xiao-Tong Luo, Yan-Ru Yao, Hua-Ming Xiao, Ming-Quan Guo
Female infertility is a worldwide medical problem, and the scarcity of infertility biomarkers has hindered the ability to launch preventive and therapeutic measures in a timely manner. Intriguingly, alterations in endocannabinoids (eCBs) and N-acylethanolamides (NAEs) have been observed in the biofluids of infertile females. Therefore, a hypothesis of using eCB and NAEs in biofluids as infertility biomarkers was proposed by several researchers; however, little evidence exists to verify the hypothesis. To investigate their correlations with female infertility, we developed a magnetic liquid microextraction-chemical derivatization (MLME-CD) method coupled with liquid chromatography-tandem mass spectrometry for the quantification of eCBs and NAEs in biofluids...
June 12, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28633993/microfluidics-as-a-strategic-player-to-decipher-single-cell-omics
#20
REVIEW
Ouriel Caen, Heng Lu, Philippe Nizard, Valerie Taly
Most cell studies are performed at a population level, relying on the assumption of a normal distribution of the function and fate of a cell among a population. However, technologies allowing single-cell analysis (SCA) have recently arisen and have led to increasing evidence of cell population heterogeneity and its importance. Tremendous amounts of new data could now be uncovered to redefine our understanding of cell omics. Microfluidics has emerged as a major technological player in this new era and is gradually increasing in use among biology laboratories, mainly due to the single-cell high-throughput handling solutions it offers...
June 17, 2017: Trends in Biotechnology
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