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https://www.readbyqxmd.com/read/28738624/multiplexed-analysis-combining-distinctly-sized-cdte-mpa-quantum-dots-and-chemometrics-for-multiple-mutually-interfering-analyte-determination
#1
Dayana B Bittar, David S M Ribeiro, Ricardo N M J Páscoa, José X Soares, S Sofia M Rodrigues, Rafael C Castro, Leonardo Pezza, Helena R Pezza, João L M Santos
Semiconductor quantum dots (QDs) have demonstrated a great potential as fluorescent probes for heavy metals monitoring. However, their great reactivity, whose tunability could be difficult to attain, could impair selectivity yielding analytical results with poor accuracy. In this work, the combination in the same analysis of multiple QDs, each with a particular ability to interact with the analyte, assured a multi-point detection that was not only exploited for a more precise analyte discrimination but also for the simultaneous discrimination of multiple mutually interfering species, in the same sample...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738563/urinary-volatile-fingerprint-based-on-mass-spectrometry-for-the-discrimination-of-patients-with-lung-cancer-and-controls
#2
Álvaro García Ramos, Ana Pérez Antón, Miguel Del Nogal Sánchez, José Luis Pérez Pavón, Bernardo Moreno Cordero
Profile signals of urine samples corresponding to patients with lung cancer and controls were obtained using a non-separative methodology. The method is based on the coupling of a headspace sampler, a programed temperature vaporizer and a mass spectrometer (HS-PTV-MS). With only a centrifugation step as prior sample treatment, the samples were subjected to the headspace generation process and the volatiles generated were introduced into the PTV where they were trapped in the Tenax® packed liner while the solvent was purged...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28737713/quality-assessment-of-gentiana-rigescens-from-different-geographical-origins-using-ft-ir-spectroscopy-combined-with-hplc
#3
Zhe Wu, Yanli Zhao, Ji Zhang, Yuanzhong Wang
Gentiana rigescens is a precious herbal medicine in China because of its liver-protective and choleretic effects. A method for the qualitative identification and quantitative evaluation of G. rigescens from Yunnan Province, China, has been developed employing Fourier transform infrared (FT-IR) spectroscopy and high performance liquid chromatography (HPLC) with the aid of chemometrics such as partial least squares discriminant analysis (PLS-DA) and support vector machines (SVM) regression. Our results indicated that PLS-DA model could efficiently discriminate G...
July 24, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28736977/use-of-microbial-indicators-combined-with-environmental-factors-coupled-to-metrology-tools-for-discrimination-and-classification-of-luzhou-flavored-pit-muds
#4
Q Y Zhang, Y J Yuan, Z M Liao, W X Zhang
AIMS: Pit mud is essential for the quality and yield of Chinese Luzhou-flavored liquor. A reliable and fast method based on the use of microbial indicators combined with environmental factors coupled to metrology tools is needed to discriminate and classify different maturity levels of Luzhou-flavored pit muds. METHODS AND RESULTS: Firmicutes, Bacteroidetes, Actinobacteria, Lactobacillus, Bacillus, Methanosarcina, Methanocorpusculum, Methanoculleus and Clostridium kluyveri were microbial indicators in Luzhou-flavored pit muds...
July 23, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28736247/interleukin-1%C3%A3-affects-the-phospholipid-biosynthesis-of-fibroblast-like-synoviocytes-from-human-osteoarthritic-knee-joints
#5
K D Sluzalska, G Liebisch, G Lochnit, B Ishaque, H Hackstein, G Schmitz, M Rickert, J Steinmeyer
OBJECTIVE: Phospholipids (PLs), together with hyaluronan and lubricin, are involved in boundary lubrication within human articular joints. Levels of lubricants in synovial fluid have been found to be associated with the health status of the joint. However, the biosynthesis and release of PLs within human joints remains poorly understood. This study contributes to our understanding of the effects of cytokines on the biosynthesis of PLs using cultured fibroblast-like synoviocytes (FLS) from human osteoarthritic knee joints...
July 20, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28734364/improved-variable-reduction-in-partial-least-squares-modelling-by-global-minimum-error-uninformative-variable-elimination
#6
Jan P M Andries, Yvan Vander Heyden, Lutgarde M C Buydens
The calibration performance of Partial Least Squares regression (PLS) can be improved by eliminating uninformative variables. For PLS, many variable elimination methods have been developed. One is the Uninformative-Variable Elimination for PLS (UVE-PLS). However, the number of variables retained by UVE-PLS is usually still large. In UVE-PLS, variable elimination is repeated as long as the root mean squared error of cross validation (RMSECV) is decreasing. The set of variables in this first local minimum is retained...
August 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28732338/toxic-organic-substances-and-marker-compounds-in-size-segregated-urban-particulate-matter-implications-for-involvement-in-the-in%C3%A2-vitro-bioactivity-of-the-extractable-organic-matter
#7
Athanasios Besis, Alexandra Tsolakidou, Dimitra Balla, Constantini Samara, Dimitra Voutsa, Anastasia Pantazaki, Theodora Choli-Papadopoulou, Theodore S Lialiaris
Toxic organic substances and polar organic marker compounds, i.e. polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs), polybrominated diphenyl ethers (PBDEs), polycyclic aromatic hydrocarbons (PAHs) and their nitro-derivatives (N-PAHs), as well as dicarboxylic acids (DCAs) and sugars/sugar anhydrites (S/SAs) were analyzed in size-segregated PM samples (<0.49, 0.49-0.97, 0.97-3 and >3 μm) collected at two urban sites (urban traffic and urban background) during the cold and the warm season...
July 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28730614/synchrotron-tomographic-images-from-human-lung-adenocarcinoma-three-dimensional-reconstruction-and-histologic-correlations
#8
Eunjue Yi, Sung-Mi Han, Ji-Eun Chang, Hong-Tae Kim, Jong-Ki Kim, Seung-Jun Seo, Jin-Haeng Chung, Sanghoon Jheon
High-resolution tomographic images using synchrotron X-rays are expected to provide detailed reflection of microstructures, thereby allowing for the examination of histologic structures without destruction of the specimen. This study aims to evaluate the synchrotron tomographic images of mixed ground-glass opacity excised on 5-mm sections in comparison to pathologic examination. The Institutional Review Board of our institute approved this retrospective study, and written informed consent was obtained from each patient whose lung tissue would be used...
July 21, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28729623/3d-qsar-studies-on-maslinic-acid-analogs-for-anticancer-activity-against-breast-cancer-cell-line-mcf-7
#9
Sarfaraz Alam, Feroz Khan
Global prevalence of breast cancer and its rising frequency makes it a key area of research in drug discovery programs. The research article describes the development of field based 3D-QSAR model based on human breast cancer cell line MCF7 in vitro anticancer activity, which defines the molecular level understanding and regions of structure-activity relationship for triterpene maslinic acid and its analogs. The key features such as average shape, hydrophobic regions and electrostatic patterns of active compounds were mined and mapped to virtually screen potential analogs...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729179/global-regression-model-for-moisture-content-determination-using-near-infrared-spectroscopy
#10
Matthieu Clavaud, Yves Roggo, Klara Degardin, Pierre-Yves Sacré, Philippe Hubert, Eric Ziemons
Near-infrared (NIR) global quantitative models were evaluated for the moisture content (MC) determination of three different freeze-dried drug products. The quantitative models were based on 3822 spectra measured on two identical spectrometers to include variability. The MC, measured with the reference Karl Fischer (KF) method, were ranged from 0.05% to 4.96%. Linear and non-linear regression models using Partial Least Square (PLS), Decision Tree (DT), Bayesian Ridge Regression (Bayes-RR), K-Nearest Neighbors (KNN), and Support Vector Regression (SVR) algorithms were created and evaluated...
July 17, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28728000/tailor-made-purified-human-platelet-lysate-concentrated-in-neurotrophins-for-treatment-of-parkinson-s-disease
#11
Ming-Li Chou, Joe-Wei Wu, Flore Gouel, Aurélie Jonneaux, Kelly Timmerman, Ting-Yi Renn, Charlotte Laloux, Hung-Ming Chang, Liang-Tzung Lin, Jean-Christophe Devedjian, David Devos, Thierry Burnouf
Human platelet lysates (PLs), which contain multiple neurotrophins, have been proposed for treating neurodegenerative disorders, including Parkinson's disease (PD). However, current PLs suspended in plasma have high protein content and contain fibrinogen/fibrin and, following activation, also proteolytic and thrombogenic enzymes. Upon brain administration, such PLs may saturate the cerebrospinal fluid and exert neurotoxicity. We assessed whether purified PLs, concentrated in neurotrophins, protected dopaminergic neurons in PD models...
July 12, 2017: Biomaterials
https://www.readbyqxmd.com/read/28726959/association-of-cultured-myotubes-and-fasting-plasma-metabolite-profiles-with-mitochondrial-dysfunction-in-type-2-diabetes-subjects
#12
Mohamad Hafizi Abu Bakar, Mohamad Roji Sarmidi
Accumulating evidence implicates mitochondrial dysfunction-induced insulin resistance in skeletal muscle as the root cause for the greatest hallmarks of type 2 diabetes (T2D). However, the identification of specific metabolite-based markers linked to mitochondrial dysfunction in T2D has not been adequately addressed. Therefore, we sought to identify the markers-based metabolomics for mitochondrial dysfunction associated with T2D. First, a cellular disease model was established using human myotubes treated with antimycin A, an oxidative phosphorylation inhibitor...
July 20, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28726126/characterization-of-a-cold-adapted-dna-photolyase-from-c-psychrerythraea-34h
#13
Sudipto Munshi, Ananthi Rajamoorthi, Robert J Stanley
The phrB gene encoding a putative cold-adapted DNA photolyase was cloned from the bacterial genomic DNA of Colwellia psychrerythraea 34H, a psychrophilic bacterium. Recombinant DNA photolyase, rCpPL, was overexpressed and purified from three different vectors. rCpPL binds its DNA substrate by flipping a cyclobutane pyrimidine dimer (CPD) into its active site and repairs CPD-containing DNA in vitro. rCpPL contains one catalytic flavin adenine dinucleotide (FAD) cofactor, but displays promiscuity in cofactor binding, in which either a flavin mononucleotide (FMN) or a methenyltetrahydrofolate (MTHF) molecule is bound as an antenna molecule and found in sub-stoichiometric amounts...
July 19, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/28723408/in-line-raman-spectroscopic-monitoring-and-feedback-control-of-a-continuous-twin-screw-pharmaceutical-powder-blending-and-tableting-process
#14
Brigitta Nagy, Attila Farkas, Martin Gyürkés, Szofia Komaromy-Hiller, Balázs Démuth, Bence Szabó, Dávid Nusser, Enikő Borbás, György Marosi, Zsombor Kristóf Nagy
The integration of Process Analytical Technology (PAT) initiative into the continuous production of pharmaceuticals is indispensable for reliable production. The present paper reports the implementation of in-line Raman spectroscopy in a continuous blending and tableting process of a three-component model pharmaceutical system, containing caffeine as model active pharmaceutical ingredient (API), glucose as model excipient and magnesium stearate as lubricant. The real-time analysis of API content, blend homogeneity, and tablet content uniformity was performed using a Partial Least Squares (PLS) quantitative method...
July 16, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28722757/discrimination-of-polygoni-multiflori-radix-and-cynanchi-auriculati-radix-using-ultra-high-performance-liquid-chromatography-fingerprints-and-chemical-pattern-recognition
#15
Lili Sun, Meng Wang, Yali Liu, Huijie Zhang, Yanan Liu, Xiaoliang Ren, Yanru Deng
In this work, a strategy was proposed to discriminate Polygoni Multiflori Radix (PMR) and its adulteration (Cynanchi Auriculati Radix, CAR). The ultra-high performance liquid chromatography (UHPLC) fingerprints were established to analyze samples containing PMR, CAR and mixtures simultaneously. Multivariate classification methods were applied to analyze the obtained UHPLC fingerprints, including principal component analysis (PCA), partial least square discriminant analysis (PLS-DA), soft independent modeling of class analogy (SIMCA), support vector machine discriminant analysis (SVMDA), and counter-propagation artificial neural network (CP-ANN)...
July 19, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28720279/metabolomic-analysis-identifies-altered-metabolic-pathways-in-multiple-sclerosis
#16
Simone Poddighe, Federica Murgia, Lorena Lorefice, Sonia Liggi, Eleonora Cocco, Maria Giovanna Marrosu, Luigi Atzori
Multiple sclerosis (MS) is a chronic, demyelinating disease that affects the central nervous system and is characterized by a complex pathogenesis and difficult management. The identification of new biomarkers would be clinically useful for more accurate diagnoses and disease monitoring. Metabolomics, the identification of small endogenous molecules in, offers an instantaneous molecular snapshot of the MS phenotype. Here the metabolomic profiles (utilizing plasma from patients with MS) were characterized with a Gas cromatography-mass spectrometry-based platform followed by a multivariate statistical analysis and comparison with a healthy control (HC) population...
July 15, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28720125/profiling-of-the-perturbed-metabolomic-state-of-mouse-spleen-during-acute-and-chronic-toxoplasmosis
#17
Xiao-Qing Chen, Chun-Xue Zhou, Hany M Elsheikha, Shuai He, Gui-Xue Hu, Xing-Quan Zhu
BACKGROUND: Toxoplasma gondii, a common opportunistic protozoan, is a leading cause of illness and mortality among immunosuppressed individuals and during congenital infections. Current therapeutic strategies for toxoplasmosis are not fully effective at curtailing disease progression in these cases. Given the parasite ability to influence host immunity and metabolism, understanding of the metabolic alterations in the host's immune organs during T. gondii infection may enhance the understanding of the molecular mechanisms that define the pathophysiology of T...
July 18, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28715717/reading-network-in-dyslexia-similar-yet-different
#18
Karen E Waldie, Anna J Wilson, Reece P Roberts, David Moreau
Dyslexia is a developmental disorder characterized by reading and phonological difficulties, yet important questions remain regarding its underlying neural correlates. In this study, we used partial least squares (PLS), a multivariate analytic technique, to investigate the neural networks used by dyslexics while performing a word-rhyming task. Although the overall reading network was largely similar in dyslexics and typical readers, it did not correlate with behavior in the same way in the two groups. In particular, there was a positive association between reading performance and both right superior temporal gyrus and bilateral insula activation in dyslexic readers but a negative correlation in typical readers...
July 15, 2017: Brain and Language
https://www.readbyqxmd.com/read/28715209/comparison-of-the-predictive-performance-and-interpretability-of-random-forest-and-linear-models-on-benchmark-datasets
#19
Richard Liam Marchese Robinson, Anna Palczewska, Jan Palczewski, Nathan Kidley
The ability to interpret the predictions made by quantitative structure activity relationships (QSARs) offers a number of advantages. Whilst QSARs built using non-linear modelling approaches, such as the popular Random Forest algorithm, might sometimes be more predictive than those built using linear modelling approaches, their predictions have been perceived as difficult to interpret. However, a growing number of approaches have been proposed for interpreting non-linear QSAR models in general and Random Forest in particular...
July 17, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28713039/efficacy-of-ankle-foot-orthoses-types-on-walking-in-children-with-cerebral-palsy-a-systematic-review
#20
REVIEW
Atefeh Aboutorabi, Mokhtar Arazpour, Monireh Ahmadi Bani, Hassan Saeedi, John S Head
BACKGROUND: Ankle foot orthoses (AFOs) are orthotic devices that can be used to normalize the walking pattern of children with cerebral palsy (CP). One of the aims of orthotic management is to produce a more normal gait pattern by positioning joints in the proper position to reduce pathological reflex or spasticity. OBJECTIVE: To conduct a systematic review of the literature and establish the effect of treatment with various types of AFOs on gait patterns of children with CP...
July 13, 2017: Annals of Physical and Rehabilitation Medicine
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