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https://www.readbyqxmd.com/read/29031184/gene-environment-interactions-between-stress-and-5-httlpr-in-depression-a-meta-analytic-update
#1
REVIEW
Dries Bleys, Patrick Luyten, Bart Soenens, Stephan Claes
BACKGROUND: Meta-analyses have yielded contradictory findings concerning the role of 5-HTTLPR in interaction with stress (GxE) in depression. The current meta-analysis investigates if these contradictory findings are a result of differences between studies in methodological approaches towards the assessment of stress and depression. METHODS: After performing a systematic database search (February to December 2016), first, a meta-analysis was used to investigate the total effect size and publication bias...
October 3, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/29031179/carbosilane-metallodendrimers-based-on-copper-ii-complexes-synthesis-epr-characterization-and-anticancer-activity
#2
Natalia Sanz Del Olmo, Marta Maroto-Díaz, Rafael Gómez, Paula Ortega, Michela Cangiotti, M Francesca Ottaviani, F Javier de la Mata
A series of new organometallic carbosilane dendrimers functionalized with Copper(II) complex on the surface were synthesized and characterized as potential anticancer agents. These metallodendrimers were synthesized through the reaction of dendritic ligands containing N,N- and N,O- donor atoms able to act as chelating agents with CuCl2 as metallic ion precursor. The structural characterization of these complexes was addressed through the use of different analytical and spectroscopical techniques. Particularly, an electron paramagnetic resonance study was performed to corroborate the coordination properties of these dendritic ligands...
September 27, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29031087/characterization-of-the-radiosynthesis-and-purification-of-18-f-thk-5351-a-pet-ligand-for-neurofibrillary-tau
#3
Tobey J Betthauser, Paul A Ellison, Dhanabalan Murali, Patrick J Lao, Todd E Barnhart, Shozo Furumoto, Nobuyuki Okamura, Sterling C Johnson, Jonathan W Engle, Robert J Nickles, Bradley T Christian
This work characterizes the radiochemical synthesis, purification, and formulation of [(18)F]THK-5351, a tau PET radioligand, and develops an automated radiosynthesis routine (ELIXYS, Sofie Biosciences). Nucleophilic radiofluorination reaction was complete by 7min at 110°C with radiochemical yields proportional to precursor mass (0.1-0.5mg). Optimized HPLC purification produced radiotracer product with no chemical impurities observed on analytical HPLC in formulation. Automated radiosynthesis (ELIXYS), HPLC purification and formulation was completed in 86min producing formulated product suitable for human research use...
October 4, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/29031057/arsenic-speciation-in-fish-and-shellfish-from-the-north-sea-southern-bight-and-a%C3%A3-u-port-area-brazil-and-health-risks-related-to-seafood-consumption
#4
Yue Gao, Paulo Baisch, Nicolai Mirlean, Flavio Manoel Rodrigues da Silva Júnior, Nik Van Larebeke, Willy Baeyens, Martine Leermakers
In North Sea and Port Açu (Brazil) coastal areas, high arsenic (As) concentrations were observed in water, soil and sediments. Therefore, the impact of this contamination on fish and shellfish species bought from local fishermen was studied. Total As was assessed with ICP-OES (Brazil) and ICP-MS (North Sea) after microwave digestion. Toxic As was assessed with liquid chromatography-ICP-MS (Brazil) and hydride generation-atomic fluorescence spectrometry (North Sea). All analytical methods comply with Quality Assurance/Quality Control procedures...
October 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/29031019/reply-to-analytical-evaluation-of-the-performances-of-diazyme-and-brahms-procalcitonin-applied-to-roche-cobas-in-comparison-with-brahms-pct-sensitive-kryptor
#5
Chong Yuan
No abstract text is available yet for this article.
October 14, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/29031018/strategies-to-define-performance-specifications-in-laboratory-medicine-3-years-on-from-the-milan-strategic-conference
#6
Mauro Panteghini, Ferruccio Ceriotti, Graham Jones, Wytze Oosterhuis, Mario Plebani, Sverre Sandberg
Measurements in clinical laboratories produce results needed in the diagnosis and monitoring of patients. These results are always characterized by some uncertainty. What quality is needed and what measurement errors can be tolerated without jeopardizing patient safety should therefore be defined and specified for each analyte having clinical use. When these specifications are defined, the total examination process will be "fit for purpose" and the laboratory professionals should then set up rules to control the measuring systems to ensure they perform within specifications...
October 14, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/29031014/indirect-method-for-validating-transference-of-reference-intervals
#7
Simon Lykkeboe, Claus Gyrup Nielsen, Peter Astrup Christensen
BACKGROUND: Transference of reference intervals (RIs) from multicentre studies are often verified by use of a small number of samples from reference individuals or by the use of one serum sample (Serum X for NORIP RI). Despite recommended and appropriate methods, both have inconveniencies and drawbacks. Several attempts have been made to develop an indirect method, which uses historical data from the laboratory. These methods are retrospective relying on older test results. A near prospective method would be preferable for the laboratories introducing new methods or changing analytical platforms...
October 14, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/29029360/laser-desorption-ionization-mass-spectrometry-recent-progress-in-matrix-free-and-label-assisted-techniques
#8
REVIEW
Arundhoti Mandal, Monisha Singha, Partha Sarathi Addy, Amit Basak
The MALDI-based mass spectrometry, over the last three decades, has become an important analytical tool. It is a gentle ionization technique, usually applicable to detect and characterize analytes with high molecular weights like proteins and other macromolecules. The earlier difficulty of detection of analytes with low molecular weights like small organic molecules and metal ion complexes with this technique arose due to the cluster of peaks in the low molecular weight region generated from the matrix. To detect such molecules and metal ion complexes, a four-prong strategy has been developed...
October 13, 2017: Mass Spectrometry Reviews
https://www.readbyqxmd.com/read/29029268/development-and-validation-of-a-method-for-the-detection-of-%C3%AE-and-%C3%AE-endosulfan-organochlorine-insecticide-in-calliphora-vomitoria-diptera-calliphoridae
#9
Paola A Magni, Marco Pazzi, Marco Vincenti, Valerio Converso, Ian R Dadour
Entomotoxicology studies employ analytical methods and instrumentation to detect chemical substances in carrion insects feeding from the decomposing tissues. The identification of such chemicals may determine the cause of death and may be used for the estimation of the minimum time since death. To date, the main focus of entomotoxicological studies has been the detection of drugs, whereas little information concerns the effects of pesticides on blowflies. Pesticides are generally freely available and more affordable than drugs but they can also be a home hazard and an accessible candidate poison at a crime scene...
October 4, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29029257/beyond-the-bulk-disclosing-the-life-of-single-microbial-cells
#10
Katrin Rosenthal, Verena Oehling, Christian Dusny, Andreas Schmid
Microbial single cell analysis has led to discoveries that are beyond what can be resolved with population-based studies. It provides a pristine view of the mechanisms that organize cellular physiology, unbiased by population heterogeneity or uncontrollable environmental impacts. A holistic description of cellular functions at the single cell level requires analytical concepts beyond the miniaturization of existing technologies, defined but uncontrolled by the biological system itself. This review provides an overview of the latest advances in single cell technologies and demonstrates their potential...
September 29, 2017: FEMS Microbiology Reviews
https://www.readbyqxmd.com/read/29029174/statistical-package-for-growth-rates-made-easy
#11
Portia Mira, Miriam Barlow, Juan C Meza, Barry G Hall
Growth rates are an important tool in microbiology because they provide high throughput fitness measurements. The release of GrowthRates, a program that uses the output of plate reader files to automatically calculate growth rates, has facilitated experimental procedures in many areas. However, many sources of variation within replicate growth rate data exist and can decrease data reliability. We have developed a new statistical package, CompareGrowthRates (CGR), to enhance the program GrowthRates and accurately measure variation in growth rate datasets...
September 26, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/29029070/development-and-validation-of-an-lc-tandem-ms-assay-for-the-quantification-of-%C3%AE-lactam-antibiotics-in-the-sputum-of-cystic-fibrosis-patients
#12
Katrien Forier, Virginie Van Heck, Mieke Carlier, Eva Van Braeckel, Sabine Van Daele, Frans De Baets, Petra Schelstraete, Filomeen Haerynck, Veronique Stove, Leen Van Simaey, Mario Vaneechoutte, Alain G Verstraete
Objectives: Antibiotic therapy is of vital importance for the control of infectious exacerbations in cystic fibrosis (CF) patients. However, very little is known regarding the fraction of systemically administered antibiotics reaching the lower respiratory tract secretions. We developed and validated a method to measure the concentrations of piperacillin, ceftazidime, meropenem and aztreonam in CF sputum, and present the validation data. Methods: Ultra-performance LC coupled to tandem MS was used...
September 27, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29029029/a-manifesto-for-cardiovascular-imaging-addressing-the-human-factor
#13
Alan G Fraser
Our use of modern cardiovascular imaging tools has not kept pace with their technological development. Diagnostic errors are common but seldom investigated systematically. Rather than more impressive pictures, our main goal should be more precise tests of function which we select because their appropriate use has therapeutic implications which in turn have a beneficial impact on morbidity or mortality. We should practise analytical thinking, use checklists to avoid diagnostic pitfalls, and apply strategies that will reduce biases and avoid overdiagnosis...
September 28, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29028878/web-based-drug-repurposing-tools-a-survey
#14
Elizabeth Sam, Prashanth Athri
Drug repurposing (a.k.a. drug repositioning) is the search for new indications or molecular targets distinct from a drug's putative activity, pharmacological effect or binding specificities. With the ever-increasing rates of termination of drugs in clinical trials, drug repositioning has risen as one of the effective solutions against the risk of drug failures. Repositioning finds a way to reverse the grim but real trend that Eroom's law portends for the pharmaceutical and biotech industry, and drug discovery in general...
October 6, 2017: Briefings in Bioinformatics
https://www.readbyqxmd.com/read/29028771/mechanisms-of-thrombocytopenia-during-septic-shock-a-multiplex-cluster-analysis-of-endogenous-sepsis-mediators
#15
Alexandre Bedet, Keyvan Razazi, Florence Boissier, Mathieu Surenaud, Sophie Hue, Stéphane Giraudier, Christian Brun-Buisson, Armand Mekontso Dessap
BACKGROUND: Thrombocytopenia is a common feature of sepsis and may involve various mechanisms often related to the inflammatory response. This study aimed at evaluating factors associated with thrombocytopenia during human septic shock. In particular, we used a multiplex analysis to assess the role of endogenous sepsis mediators. METHODS: Prospective, observational study. Thrombocytopenia was defined as an absolute platelet count <100 G/L or a 50% relative decrease in platelet count during the first week of septic shock...
October 12, 2017: Shock
https://www.readbyqxmd.com/read/29028618/one-single-standard-substance-for-the-simultaneous-determination-of-17-triterpenes-in-ganoderma-lingzhi-and-its-related-species-using-high-performance-liquid-chromatography
#16
Wei Liu, Jingsong Zhang, Wei Han, Yanfang Liu, Jie Feng, Chuanhong Tang, Na Feng, Qingjiu Tang
Due to the difficulty and high cost for the preparation of triterpenes, one single standard for the simultaneous determination of multi-components (SSDMC) with high performance liquid chromatography (HPLC) is an advanced solution for multi-component analysis. Experiments were carried out to investigate the feasibility of SSDMC for the analysis of Ganoderma triterpenes, with external standard method (ESM) compared, and the samples of Ganoderma were classified by the content of Ganoderma triterpenes. The analysis was performed by using a Fortis Speed Core-C18 column (150mm×4...
October 6, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29028616/simultaneous-determination-of-a-novel-c-met-axl-dual-target-small-molecule-inhibitor-bpi-9016m-and-its-metabolites-in-human-plasma-by-liquid-chromatography-tandem-mass-spectrometry-application-in-a-pharmacokinetic-study-in-chinese-advanced-solid-tumor-patients
#17
Xinge Cui, Xin Zheng, Ji Jiang, Fenlai Tan, Lieming Ding, Pei Hu
BPI-9016M is a novel dual-target small-molecule inhibitor targeting c-Met and AXL, which was developed by Betta Pharmaceuticals Co., Ltd (Hangzhou, China). It has great potential in the treatment of advanced cancer. A high throughput quantitation method, based on liquid chromatography-tandem mass spectrometry, was developed and validated for the simultaneous determination of BPI-9016M and its main metabolite, M1 and M2-2, in human plasma with a sample preparation method of precipitation of protein. Liquid chromatographic separation was performed with a gradient elution of formic acid-10mM ammonium acetate aqueous solution (1:1000, v/v) and acetonitrile at a flow rate of 0...
October 8, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29028614/simultaneous-determination-of-five-alternaria-toxins-in-cereals-using-quechers-based-methodology
#18
Jian Zhou, Jiao-Jiao Xu, Zeng-Xuan Cai, Bai-Fen Huang, Mi-Cong Jin, Yi-Ping Ren
Two analytical approaches, including ultra-high performance liquid chromatograph linked with photo-diode array/fluorescence detector, and ultra-high performance liquid chromatography-tandem mass spectrometry, have been proposed for simultaneous determination of five Alternaria toxins in cereals, which both based on QuEChERS strategy. After QuEChERS extraction and salting out, the collected supernatant was subjected to an extra dispersive liquid-liquid microextraction step prior to quantitative analysis. Response surface methodology based on central composite design was employed to optimize the micro-extraction conditions...
October 4, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29028598/a-particle-swarm-based-algorithm-for-optimization-of-multi-layered-and-graded-dental-ceramics
#19
Ehsan Askari, Paulo Flores, Filipe Silva
The thermal residual stresses (TRSs) generated owing to the cooling down from the processing temperature in layered ceramic systems can lead to crack formation as well as influence the bending stress distribution and the strength of the structure. The purpose of this study is to minimize the thermal residual and bending stresses in dental ceramics to enhance their strength as well as to prevent the structure failure. Analytical parametric models are developed to evaluate thermal residual stresses in zirconia-porcelain multi-layered and graded discs and to simulate the piston-on-ring test...
October 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29028597/a-continuum-model-for-tension-compression-asymmetry-in-skeletal-muscle
#20
Marcos Latorre, Melika Mohammadkhah, Ciaran K Simms, Francisco J Montáns
Experiments on passive skeletal muscle on different species show a strong asymmetry in the observed tension-compression mechanical behavior. This asymmetry shows that the tension modulus is two orders of magnitude higher than the compression modulus. Until now, traditional analytical constitutive models have been unable to capture that strong asymmetry in anisotropic solids using the same material parameters. In this work we present a model which is able to accurately capture five experimental tests in chicken pectoralis muscle, including the observed tension-compression asymmetry...
September 11, 2017: Journal of the Mechanical Behavior of Biomedical Materials
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