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https://www.readbyqxmd.com/read/29353433/recent-trends-and-analytical-challenges-in-plant-bioactive-peptide-separation-identification-and-validation
#1
REVIEW
Susy Piovesana, Anna Laura Capriotti, Chiara Cavaliere, Giorgia La Barbera, Carmela Maria Montone, Riccardo Zenezini Chiozzi, Aldo Laganà
Interest in research into bioactive peptides (BPs) is growing because of their health-promoting ability. Several bioactivities have been ascribed to peptides, including antioxidant, antihypertensive and antimicrobial properties. As they can be produced from precursor proteins, the investigation of BPs in foods is becoming increasingly popular. For the same reason, production of BPs from by-products has also emerged as a possible means of reducing waste and recovering value-added compounds suitable for functional food production and supplements...
January 20, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29353431/sensitive-electrochemical-detection-of-microrna-21-based-on-propylamine-functionalized-mesoporous-silica-with-glucometer-readout
#2
Kun Deng, Yong Zhang, Xuedong Tong
A new homogeneous electrochemical sensing system was developed for sensitive detection of microRNA-21 (miRNA-21) based on target-induced glucose release from propylamine-functionalized mesoporous silica nanoparticle (MSN) with glucometer readout. Glucose molecules (as the signal tracers) were initially gated into the pores through the interaction of the negatively charged anchor DNA with the aminated MSN. Upon addition of target miRNA, the analyte competitively hybridized with anchor DNA to form the RNA-DNA duplex, thus resulting in detachment of anchor DNA from the MSN accompanying the pore opening...
January 20, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29353429/a-sensitive-method-using-spme-pre-concentration-for-the-quantification-of-aromatic-amines-in-indoor-air
#3
Vincent Lucaire, Jean-Jacques Schwartz, Olivier Delhomme, Ruben Ocampo-Torres, Maurice Millet
Monitoring the levels of aliphatic and aromatic amines (AA) in indoor air is important to protect human health because of exposure to these compounds through diet and inhalation. A sampling and analytical method using XAD-2 cartridges and gas chromatography coupled to mass spectrometry used for assessing 25 AA in different smoking and non-smoking indoor environment was developed. After sampling and delivering 1 m3 of air (6-8 h sampling), an adsorbent was ultrasonically extracted with acetonitrile, concentrated to 1 mL and diluted in 25 mL of water (pH = 9; 5% NaCl), and then extracted for 40 min at 80 °C using a divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) fiber and injected in a GC/MS system...
January 20, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29353313/general-solution-of-the-chemical-master-equation-and-modality-of-marginal-distributions-for-hierarchic-first-order-reaction-networks
#4
Matthias Reis, Justus A Kromer, Edda Klipp
Multimodality is a phenomenon which complicates the analysis of statistical data based exclusively on mean and variance. Here, we present criteria for multimodality in hierarchic first-order reaction networks, consisting of catalytic and splitting reactions. Those networks are characterized by independent and dependent subnetworks. First, we prove the general solvability of the Chemical Master Equation (CME) for this type of reaction network and thereby extend the class of solvable CME's. Our general solution is analytical in the sense that it allows for a detailed analysis of its statistical properties...
January 20, 2018: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/29353216/an-efficient-swarm-intelligence-approach-to-feature-selection-based-on-invasive-weed-optimization-application-to-multivariate-calibration-and-classification-using-spectroscopic-data
#5
Saheleh Sheykhizadeh, Abdolhossein Naseri
Variable selection plays a key role in classification and multivariate calibration. Variable selection methods are aimed at choosing a set of variables, from a large pool of available predictors, relevant to the analyte concentrations estimation, or to achieve better classification results. Many variable selection techniques have now been introduced among which, those which are based on the methodologies of swarm intelligence optimization have been more respected during a few last decades since they are mainly inspired by nature...
January 12, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29353162/monolayers-of-a-tetrazine-containing-gemini-amphiphile-interplays-with-biomembrane-lipids
#6
Hiromichi Nakahara, Masayori Hagimori, Takahiro Mukai, Osamu Shibata
The property of a newly synthesized tetrazine derivative comprised of double C18-saturated hydrocarbon chain (C18-rTz-C18) has been studied in situ at the air-water interface. C18-rTz-C18 or a gemini amphiphile contributes to restriction of its tetrazine moiety on the interface, which is expected to be used for bioimaging and analytical reagents. Herein, to understand lateral interactions between Tz and biomembrane constituents, we investigated the interfacial behavior of Langmuir monolayers composed of C18-rTz-C18 and biomembrane lipids such as DPPC, DPPG, DPPE, PSM, and Cholesterol (Ch)...
January 17, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29353160/prediction-of-venous-thromboembolism-using-semantic-and-sentiment-analyses-of-clinical-narratives
#7
Susan Sabra, Khalid Mahmood Malik, Mazen Alobaidi
Venous thromboembolism (VTE) is the third most common cardiovascular disorder. It affects people of both genders at ages as young as 20 years. The increased number of VTE cases with a high fatality rate of 25% at first occurrence makes preventive measures essential. Clinical narratives are a rich source of knowledge and should be included in the diagnosis and treatment processes, as they may contain critical information on risk factors. It is very important to make such narrative blocks of information usable for searching, health analytics, and decision-making...
January 3, 2018: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29353072/development-of-subcortical-volumes-across-adolescence-in-males-and-females-a-multisample-study-of-longitudinal-changes
#8
Megan M Herting, Cory Johnson, Kathryn L Mills, Nandita Vijayakumar, Meg Dennison, Chang Liu, Anne-Lise Goddings, Ronald E Dahl, Elizabeth R Sowell, Sarah Whittle, Nicholas B Allen, Christian K Tamnes
The developmental patterns of subcortical brain volumes in males and females observed in previous studies have been inconsistent. To help resolve these discrepancies, we examined developmental trajectories using three independent longitudinal samples of participants in the age-span of 8-22 years (total 216 participants and 467 scans). These datasets, including Pittsburgh (PIT; University of Pittsburgh, USA), NeuroCognitive Development (NCD; University of Oslo, Norway), and Orygen Adolescent Development Study (OADS; The University of Melbourne, Australia), span three countries and were analyzed together and in parallel using mixed-effects modeling with both generalized additive models and general linear models...
January 15, 2018: NeuroImage
https://www.readbyqxmd.com/read/29353065/detection-of-protein-targets-with-a-single-binding-epitope-using-dna-templated-photo-crosslinking-and-strand-displacement
#9
Yiran Huang, Wenlu Zheng, Xiaoyu Li
DNA-based probes are powerful analytical tools for protein detection and analysis. Target-induced DNA assembly is a widely used strategy to transduce target-ligand binding to detectable signals. However, most of the existing methods based on DNA assembly require two or more binding sites on the target protein. Here we report a novel detection method suitable for protein targets with just a single binding site. This method is based on target-induced probe assembly, DNA-templated photo-crosslinking, and DNA-mediated toehold strand displacement to form a tri-probe complex that is specific for target protein...
January 15, 2018: Analytical Biochemistry
https://www.readbyqxmd.com/read/29352787/communication-exact-analytical-derivatives-for-the-domain-based-local-pair-natural-orbital-mp2-method-dlpno-mp2
#10
Peter Pinski, Frank Neese
Electron correlation methods based on pair natural orbitals (PNOs) have gained an increasing degree of interest in recent years, as they permit energy calculations to be performed on systems containing up to many hundred atoms, while maintaining chemical accuracy for reaction energies. We present an approach for taking exact analytical first derivatives of the energy contributions in the simplest method of the family of Domain-based Local Pair Natural Orbital (DLPNO) methods, closed-shell DLPNO-MP2. The Lagrangian function contains constraints to account for the relaxation of PNOs...
January 21, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29352548/prediction-of-psychosis-across-protocols-and-risk-cohorts-using-automated-language-analysis
#11
Cheryl M Corcoran, Facundo Carrillo, Diego Fernández-Slezak, Gillinder Bedi, Casimir Klim, Daniel C Javitt, Carrie E Bearden, Guillermo A Cecchi
Language and speech are the primary source of data for psychiatrists to diagnose and treat mental disorders. In psychosis, the very structure of language can be disturbed, including semantic coherence (e.g., derailment and tangentiality) and syntactic complexity (e.g., concreteness). Subtle disturbances in language are evident in schizophrenia even prior to first psychosis onset, during prodromal stages. Using computer-based natural language processing analyses, we previously showed that, among English-speaking clinical (e...
February 2018: World Psychiatry: Official Journal of the World Psychiatric Association (WPA)
https://www.readbyqxmd.com/read/29352472/the-bioequivalence-of-a-single-intravenous-administration-of-the-anesthetic-alfaxalone-in-cyclodextrin-versus-alfaxalone-in-cyclodextrin-plus-preservatives-in-cats
#12
K Pasloske, M G Ranasinghe, S Sauer, J Hare
To demonstrate the bioequivalence of alfaxalone in cyclodextrin (Reference Product) to a formulation of alfaxalone in cyclodextrin also containing the preservatives ethanol, chlorocresol, and benzethonium chloride (Test Product) when administered for the purpose of inducing anesthesia in the cat. Blinded, single-dose, randomized, two-period, two-sequence, cross-over bioequivalence study with a 7-day washout period between treatments. Twenty-four (12 neutered males and 12 intact females), healthy, adult cats weighing 4...
January 19, 2018: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29352440/the-limitations-of-standard-clinicopathologic-features-to-accurately-risk-stratify-prognosis-after-resection-of-intrahepatic-cholangiocarcinoma
#13
Fabio Bagante, Katiuscha Merath, Malcolm H Squires, Matthew Weiss, Sorin Alexandrescu, Hugo P Marques, Luca Aldrighetti, Shishir K Maithel, Carlo Pulitano, Todd W Bauer, Feng Shen, George A Poultsides, Olivier Soubrane, Guillaume Martel, B Groot Koerkamp, Alfredo Guglielmi, Endo Itaru, Timothy M Pawlik
BACKGROUND: The ability to provide accurate prognostic data after hepatectomy for intrahepatic cholangiocarcinoma (ICC) remains poor. We sought to develop and validate a nomogram to predict survival, as well as investigate the clinical implications of underestimating patients' risk of recurrence. METHODS: Patients undergoing curative-intent resection of ICC between 1990 and 2015 at 14 major hepatobiliary centers were included. Variables significant on multivariable analysis were used to construct a nomogram to predict disease-free survival (DFS)...
January 19, 2018: Journal of Gastrointestinal Surgery: Official Journal of the Society for Surgery of the Alimentary Tract
https://www.readbyqxmd.com/read/29352367/continuous-manufacturing-of-co-crystals-challenges-and-prospects
#14
REVIEW
Rahul B Chavan, Rajesh Thipparaboina, Balvant Yadav, Nalini R Shastri
The last decade has witnessed extensive growth in the field of co-crystallization for mitigating the solubility and dissolution-related issues of poorly soluble drugs. This is largely because co-crystals can modify the physicochemical properties of drugs without any covalent modification in the drug molecules. The US Food and Drug Administration (FDA) now considers drug products that are designed to contain a new co-crystal, analogous to new polymorph of the active pharmaceutical ingredient (API). This positive change in regulatory perspective coupled with successful commercialization of valsartan-sacubitril co-crystal (Entresto, Novartis) has now brought co-crystals into focus, in both industries as well as academia...
January 19, 2018: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/29352126/role-of-subcortical-structures-on-cognitive-and-social-function-in-schizophrenia
#15
Daisuke Koshiyama, Masaki Fukunaga, Naohiro Okada, Fumio Yamashita, Hidenaga Yamamori, Yuka Yasuda, Michiko Fujimoto, Kazutaka Ohi, Haruo Fujino, Yoshiyuki Watanabe, Kiyoto Kasai, Ryota Hashimoto
Subcortical regions have a pivotal role in cognitive, affective, and social functions in humans, and the structural and functional abnormalities of the regions have been associated with various psychiatric disorders. Although previous studies focused on the neurocognitive and socio-functional consequences of prefrontal and tempolo-limbic abnormalities in psychiatric disorders, those of subcortical structures remain largely unknown. Recently, MRI volume alterations in subcortical structures in patients with schizophrenia have been replicated in large-scale meta-analytic studies...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352116/the-chemical-fluctuation-theorem-governing-gene-expression
#16
Seong Jun Park, Sanggeun Song, Gil-Suk Yang, Philip M Kim, Sangwoon Yoon, Ji-Hyun Kim, Jaeyoung Sung
Gene expression is a complex stochastic process composed of numerous enzymatic reactions with rates coupled to hidden cell-state variables. Despite advances in single-cell technologies, the lack of a theory accurately describing the gene expression process has restricted a robust, quantitative understanding of gene expression variability among cells. Here we present the Chemical Fluctuation Theorem (CFT), providing an accurate relationship between the environment-coupled chemical dynamics of gene expression and gene expression variability...
January 19, 2018: Nature Communications
https://www.readbyqxmd.com/read/29352044/resolution-of-spurious-immunonephelometric-igg-subclass-measurement-discrepancies-by-lc-ms-ms
#17
Grace van der Gugten, Mari L DeMarco, Luke Y C Chen, Alex Chin, Mollie Caruthers, Daniel T Holmes, Andre Mattman
BACKGROUND: The Binding Site immunonephelometric (IN) IgG subclass reagents (IgG1, IgG2, IgG3, IgG4, BSIN) are used for assessment of both immunodeficiency and IgG4-related disease (IgG4-RD). In our laboratory, suspected analytic errors were noted in patients with increases in IgG4: The sum of the individual IgG subclasses was substantially greater than the measured total IgG concentrations (unlike samples with normal IgG4), and the IgG4 concentration was always less than the IgG2 concentration...
January 19, 2018: Clinical Chemistry
https://www.readbyqxmd.com/read/29352006/machine-learning-in-cardiovascular-medicine-are-we-there-yet
#18
REVIEW
Khader Shameer, Kipp W Johnson, Benjamin S Glicksberg, Joel T Dudley, Partho P Sengupta
Artificial intelligence (AI) broadly refers to analytical algorithms that iteratively learn from data, allowing computers to find hidden insights without being explicitly programmed where to look. These include a family of operations encompassing several terms like machine learning, cognitive learning, deep learning and reinforcement learning-based methods that can be used to integrate and interpret complex biomedical and healthcare data in scenarios where traditional statistical methods may not be able to perform...
January 19, 2018: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/29351866/bioanalysis-of-a-panel-of-neurotransmitters-and-their-metabolites-in-plasma-samples-obtained-from-pediatric-patients-with-neuroblastoma-and-wilms-tumor
#19
Lucyna Konieczna, Anna Roszkowska, Teresa Stachowicz-Stencel, Anna Synakiewicz, Tomasz Bączek
This paper details the quantitative analysis of neurotransmitters, including dopamine (DA), norepinephrine (NE), epinephrine (E), and serotonin (5-HT), along with their respective precursors and metabolites in children with solid tumors: Wilms' tumor (WT) and neuroblastoma (NB). A panel of neurotransmitters was determined with the use of dispersive liquid-liquid microextraction (DLLME) technique combined with liquid-chromatography mass spectrometry (LC-MS/MS) in plasma samples obtained from a group of pediatric subjects with solid tumors and a control group of healthy children...
December 28, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29351815/ready-to-use-protein-g-conjugated-gold-nanorods-for-biosensing-and-biomedical-applications
#20
S Centi, F Ratto, F Tatini, S Lai, R Pini
BACKGROUND: Gold nanorods (GNRs) display unique capacity to absorb and scatter near infrared light, which arises from their peculiar composition of surface plasmon resonances. For this reason, GNRs have become an innovative material of great hope in nanomedicine, in particular for imaging and therapy of cancer, as well as in photonic sensing of biological agents and toxic compounds for e.g. biomedical diagnostics, forensic analysis and environmental monitoring. As the use of GNRs is becoming more and more popular, in all these contexts, there is emerging a latent need for simple and versatile protocols for their modification with targeting units that may convey high specificity for any analyte of interest of an end-user...
January 19, 2018: Journal of Nanobiotechnology
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