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Min Wei, Wenyang Zhang
In this work, a novel aptamer-based electrochemical biosensor was developed for the determination of Ochratoxin A (OTA) by using carbon aerogels (CAs) and methylene blue (MB) as signal amplification strategy. CAs was used as carrier to load the abundant of complementary DNA (cDNA), which could enhance the hybridization between CAs-cDNA and aptamer immobilized on the electrode surface, thus provide more double-stranded DNA for MB intercalation. The current of MB on the CAs-cDNA/apt/AuE sensor was twice that on the cDNA/apt/AuE sensor, which indicated that the CAs with high surface area enabled a higher loading of the cDNA and absorbed more MB, thus realized the signal amplification strategy...
April 25, 2018: Chemistry Central Journal
Sylvanus Mensah, Ben du Toit, Thomas Seifert
Forest stratification plays a crucial role in light interception and plant photosynthetic activities. However, despite the increased number of studies on biodiversity-ecosystem function, we still lack information on how stratification in tropical forests modulates biodiversity effects. Moreover, there is less investigation and argument on the role of species and functional traits in forest layers. Here, we analysed from a perspective of forest layer (sub-canopy, canopy and emergent species layers), the relationship between diversity and aboveground biomass (AGB), focusing on functional diversity and dominance, and underlying mechanisms such as niche complementarity and selection...
April 24, 2018: Oecologia
Jean Weigert, Nancy Cavanaugh, Talong Ju
PURPOSE: To evaluate mammographers' acceptance of the breast cancer risk assessment software tool MammoRisk (Statlife) in the clinical setting. METHODS: During a 6-month period, 1200 women undergoing routine mammography examinations at a regional, outpatient, comprehensive breast imaging center were assessed for breast cancer risk by mammographers who used the MammoRisk software. At the end of the 6-month period, the mammographers (N = 11) completed an 8-question survey on their willingness to the use of the software in the clinical setting...
March 2018: Radiologic Technology
Danyi Lu, Dong Dong, Qian Xie, Zhijie Li, Baojian Wu
UDP-glucuronosyltransferases (UGTs) play an important role in metabolism and detoxification of amine-containing chemicals. However, the disposition mechanisms for amines via UGT metabolism are not fully clear. Here we aim to investigate a potential role of UGT2B10 in N-glucosidation, and to determine the transporters for excretion of N-glucosides. We first established a HEK293 cell line stably overexpressing UGT2B10. Incubation of mianserin or cyclizine with the cells generated one N-glucuronide and one N-glucoside...
April 24, 2018: Drug Metabolism and Disposition: the Biological Fate of Chemicals
M A Cañizares Méndez, Manuel Amosa Delgado, Juan Antonio Álvarez Salgado, Jorge Javier Villaseñor Ledezma, Elena Capilla Cabezuelo, Francisco Díaz Crespo
Papillary tumor of the pineal region is a rare neuroepithelial tumor characterized by papillary architecture and epithelial cytology, immunopositivity for cytokeratin and ependymal differentiation. It is considered grade II-III by the World Health Organization and was first described by Jouvet in 2003. We present a 34-year-old male with headaches, blurred vision and normal examination. Radiological study showed a nodulocystic lesion in the pineal region compatible with pineocytoma. Surgery was performed using an infratentorial supracerebellar approach, finding a cystic tumor in the quadrigeminal cistern which was completely resected...
April 21, 2018: Neurocirugía
Victor Counted, Adam Possamai, Tanya Meade
BACKGROUND: Despite the increasing number of evidence-based research on relational spirituality (RS) and quality of life (QoL) in medical-health research, little is known about the links between RS and QoL outcomes and the mechanisms by which RS aspects are functionally tied to QoL. OBJECTIVE: To determine how RS is perceived/positioned in relation to QoL, we (a) examined recent available data that identify and appraise the links between RS and QoL; (b) identified themes emerging from the association between RS and QoL, and (c) discussed the implications of the effects of RS on QoL outcomes...
April 24, 2018: Health and Quality of Life Outcomes
Chun-Tang Chiou, Kaw-Chen Wang, Ying-Chen Yang, Chuen-Lin Huang, Sien-Hung Yang, Yao-Haur Kuo, Nai-Kuei Huang
Liu Jun Zi Tang (LJZT) has been used to treat functional dyspepsia and depression, suggesting its effects on gastrointestinal and neurological functions. LJZT is currently used as a complementary therapy to attenuate cisplatin-induced side effects, such as dyspepsia. However, its effect on chemotherapy-induced neuropathic pain or neurotoxicity has rarely been studied. Thus, we explored potential mechanisms underlying LJZT protection against cisplatin-induced neurotoxicity. We observed that LJZT attenuated cisplatin-induced thermal hyperalgesia in mice and apoptosis in human neuroblastoma SH-SY5Y cells...
April 23, 2018: International Journal of Molecular Sciences
Abdul Rahim Ferhan, Joshua A Jackman, Tun Naw Sut, Nam-Joon Cho
Nanoplasmonic sensors are a popular, surface-sensitive measurement tool to investigate biomacromolecular interactions at solid-liquid interfaces, opening the door to a wide range of applications. In addition to high surface sensitivity, nanoplasmonic sensors have versatile surface chemistry options as plasmonic metal nanoparticles can be coated with thin dielectric layers. Within this scope, nanoplasmonic sensors have demonstrated promise for tracking protein adsorption and substrate-induced conformational changes on oxide film-coated arrays, although existing studies have been limited to single substrates...
April 22, 2018: Sensors
Alexandre B Bonaldo, Arno A Lise, MartÍn J RamÍrez, Regiane Saturnino
Six new species of the genus Eutichurus Simon, 1897 are described: E. murgai new species (based on male and female) and E. paredesi new species (male) from Peru; E. cumbia new species (female) and E. tequendama new species (male) from Colombia; E. yungas new species (male and female) from Bolivia, and E. nancyae new species (male and female) from Brazil. The males of E. marquesae Bonaldo, 1994, E. madre Bonaldo, 1994 and E. zarate Bonaldo, 1994 are described for the first time. Eutichurus brescoviti Bonaldo, 1994, described on males, is synonymized with E...
February 21, 2018: Zootaxa
Jeannine Cavender-Bares, Shan Kothari, José Eduardo Meireles, Matthew A Kaproth, Paul S Manos, Andrew L Hipp
PREMISE OF THE STUDY: Evolutionary and biogeographic history, including past environmental change and diversification processes, are likely to have influenced the expansion, migration, and extinction of populations, creating evolutionary legacy effects that influence regional species pools and the composition of communities. We consider the consequences of the diversification process in shaping trait evolution and assembly of oak-dominated communities throughout the continental United States (U...
April 24, 2018: American Journal of Botany
Andre Krause, Yu Wu, Runtao Tian, Teris A van Beek
High-field NMR is an expensive and important quality control technique. In recent years, cheaper and simpler low-field NMR has become available as a new quality control technique. In this study, 60 MHz 1 H-NMR was compared with GC-MS and refractometry for the detection of adulteration of essential oils, taking patchouli essential oil as a test case. Patchouli essential oil is frequently adulterated, even today. In total, 75 genuine patchouli essential oils, 10 commercial patchouli essential oils, 10 other essential oils, 17 adulterants, and 1 patchouli essential oil, spiked at 20% with those adulterants, were measured...
April 24, 2018: Planta Medica
Elisa Cainelli, Daniele Trevisanuto, Francesco Cavallin, Renzo Manara, Agnese Suppiej
OBJECTIVES: To assess the prognostic role of evoked potentials (EP) in neonates with normal magnetic resonance imaging (MRI) after therapeutic hypothermia (TH) for hypoxic-ischemic encephalopathy (HIE). METHODS: Thirty-five neonates recruited for TH because of HIE, having normal neonatal MRI, performed neonatal somatosensory (SEP), visual (VEP) evoked potentials and electroencephalogram (EEG). The effect of SEP, VEP or EEG abnormalities on Griffith's developmental scales at 12 and 24 months was measured; positive (PPV) and negative (NPV) predictive value, sensitivity, specificity and accuracy were calculated...
April 16, 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
K Kumar, Bandi Siva, V U M Sarma, Satish Mohabe, A Madhusudana Reddy, Joel Boustie, Ashok K Tiwari, N Rama Rao, K Suresh Babu
Comparative phytochemical analysis of five lichen species [Parmotrema tinctorum (Delise ex Nyl.) Hale, P. andinum (Mull. Arg.) Hale, P. praesorediosum (Nyl.) Hale, P. grayanum (Hue) Hale, P. austrosinense (Zahlbr.) Hale] of Parmotrema genus were performed using two complementary UPLC-MS systems. The first system consists of high resolution UPLC-QToF-MS/MS spectrometer and the second system consisted of UPLC-MS/MS in Multiple Reaction Monitoring (MRM) mode for quantitative analysis of major constituents in the selected lichen species...
April 19, 2018: Journal of Pharmaceutical and Biomedical Analysis
Alfred Tuley, Walter Fast
Covalent enzyme inhibitors are widely applied as biochemical tools and therapeutic agents. As a complement to categorization of these inhibitors by reactive group or modification site, we present a categorization by mechanism, which highlights common advantages and disadvantages inherent to each approach. Established categories for reversible and irreversible covalent inhibition are reviewed with representative examples given for each class, including covalent reversible inhibitors, slow substrates, residue-specific reagents, affinity labels (classical, quiescent, and photoaffinity), and mechanism-based inactivators...
April 24, 2018: Biochemistry
Caroline D Bösch, Jovana Jevric, Nutcha Bürki, Markus Probst, Simon M Langenegger, Robert Häner
Vesicle-shaped supramolecular polymers are formed by self-assembly of a DNA duplex containing phenanthrene overhangs at both ends. In presence of spermine, the phenanthrene overhangs act as sticky ends linking the DNA duplexes together. In aqueous solution, the assembly leads to vesicles in the range of 50 - 200 nm, as shown by electron microscopy and dynamic light scattering. Fluorescence measurements show that the assembled phenanthrene units act as light-harvesting antennae and transfer absorbed energy to an acceptor, such as pyrene or Cy3, which can either be directly added to the polymer or attached via a complementary DNA strand...
April 24, 2018: Bioconjugate Chemistry
Anders Hauggaard, Maria Kjellin, Sven-Erik Olsson
Coranary investigation with CCTA can depict coronary stenosis of high and low grade with high degree of accuracy, while intermediary stenosis on CTTA often needs complementary investigation with invasive coronary angiography. Simulated FFRCT analysis is a non-invasive evaluation of degree of stenosis of coronary vessels with a potential to reduce the number of invasive coronary angiography of intermediate stenosis. Helsingborg Hospital, together with HeartFlow Inc, is the first clinic in Sweden to have implemented simulated FFRCT analysis in clinical practice...
April 19, 2018: Läkartidningen
Chiara Fabbri, Filippo Corponi, Daniel Souery, Siegfried Kasper, Stuart Montgomery, Joseph Zohar, Dan Rujescu, Julien Mendlewicz, Alessandro Serretti
Background: One-third of depressed patients develop treatment-resistant depression with the related sequelae in terms of poor functionality and worse prognosis. Solid evidence suggests that genetic variants are potentially valid predictors of antidepressant efficacy and could be used to provide personalized treatments. Methods: The present review summarizes genetic findings of treatment-resistant depression including results from candidate gene studies and genome-wide association studies...
April 21, 2018: International Journal of Neuropsychopharmacology
Carles Hernandez-Ferrer, Juan R Gonzalez
Summary: Biomedical studies currently include a large volume of genomic and environmental factors for studying the etiology of human diseases. R/Bioconductor projects provide several tools for performing enrichment analysis at gene-pathway level, allowing researchers to develop novel hypotheses. However, there is a need to perform similar analyses at the chemicals-genes or chemicals-diseases levels, to provide complementary knowledge of the causal path between chemicals and diseases. While the Comparative Toxicogenomics DatabaseTM (CTD) provides information about these relationships, there is no software for integrating it into R/Bioconductor analysis pipelines...
April 24, 2018: Bioinformatics
Soledad Ceccarelli, Agustín Balsalobre, Paula Medone, María Eugenia Cano, Rodrigo Gurgel Gonçalves, Dora Feliciangeli, Darío Vezzani, Cristina Wisnivesky-Colli, David E Gorla, Gerardo A Marti, Jorge E Rabinovich
Trypanosoma cruzi, the causative agent of Chagas disease, is transmitted to mammals - including humans - by insect vectors of the subfamily Triatominae. We present the results of a compilation of triatomine occurrence and complementary ecological data that represents the most complete, integrated and updated database (DataTri) available on triatomine species at a continental scale. This database was assembled by collecting the records of triatomine species published from 1904 to 2017, spanning all American countries with triatomine presence...
April 24, 2018: Scientific Data
K Kranthi Kumar, B Uma Devi, P Neeraja
In this study, cholesterol biotransformation gene-set of human steroidogenic acute regulatory protein-related lipid transfer (START) domains were evaluated from high-throughput gene screening approaches. It was shown that STARD1, STARD3 and STARD4 proteins are better effective transporters of cholesterol than STARD5 and STARD6 domains. Docking studies show a strong agreement with gene ontology enrichment data. According to both complementary strategies, it was found that only STARD1, STARD3 and STARD4 are potentially involved in cholesterol biotransformation in mitochondria through Ω1-loop of C-terminal α4-helical domain...
April 24, 2018: SAR and QSAR in Environmental Research
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