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https://www.readbyqxmd.com/read/29793194/simultaneous-determination-of-18-psychoactive-agents-and-6-metabolites-in-plasma-using-lc-ms-ms-and-application-to-actual-plasma-samples-from-conscription-candidates
#1
Dongeun Park, Hyeyoung Choi, Moonhee Jang, Hyejin Chang, Sanghee Woo, Wonkyung Yang
In Korea, an increasing number of people attempt to evade military conscription by posing as mental health patients. To verify the authenticity of mental illness, there is a need to detect wide range of psychoactive agents in biological specimens of conscription candidates. In this study, we developed and validated a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for simultaneous determination of 18 psychoactive agents and 6 metabolites in human plasma. The method was characterized by the use of a simple, fast and cheap protein precipitation as sample preparation, a rapid run time (11min) and a low volume of plasma sample (200μL)...
April 22, 2018: Forensic Science International
https://www.readbyqxmd.com/read/29793014/calf-muscle-oxygen-saturation-during-six-minute-walk-test-and-its-relationship-with-walking-impairment-in-symptomatic-peripheral-artery-disease
#2
Aluísio Andrade-Lima, Gabriel G Cucato, Wagner J R Domingues, Antônio H Germano-Soares, Bruno R Cavalcante, Marilia A Correia, Glauco F Saes, Nelson Wolosker, Andrew W Gardner, Antônio E Zerati, Raphael M Ritti-Dias
OBJECTIVE: Impaired microcirculation is associated with poor walking capacity in symptomatic peripheral artery disease (PAD) patients during treadmill test, however, this test does not simulate the efforts of daily walking of these patients. Thus, the aim of the study was to describe the microcirculation responses during six-minute walk test (6MWT) and to analyze the relationship between microcirculation indicators and walking impairment in symptomatic PAD patients. METHODS: Thirty-four patients were included (mean age = 67...
May 21, 2018: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29792200/wedge-shaped-microfluidic-chip-for-circulating-tumor-cells-isolation-and-its-clinical-significance-in-gastric-cancer
#3
Chaogang Yang, Nangang Zhang, Shuyi Wang, Dongdong Shi, Chunxiao Zhang, Kan Liu, Bin Xiong
BACKGROUND: Circulating tumor cells (CTCs) have great potential in both basic research and clinical application for the managements of cancer. However, the complicated fabrication processes and expensive materials of the existing CTCs isolation devices, to a large extent, limit their clinical translation and CTCs' clinical value. Therefore, it remains to be urgently needed to develop a new platform for achieving CTCs detection with low-cost, mass-producible but high performance. METHODS: In the present study, we introduced a novel wedge-shaped microfluidic chip (named CTC-ΔChip) fabricated by two pieces of glass through wet etching and thermal bonding technique for CTCs isolation, which achieved CTCs enrichment by different size without cell surface expression markers and CTCs identification with three-color immunocytochemistry method (CK+/CD45-/Nucleus+)...
May 23, 2018: Journal of Translational Medicine
https://www.readbyqxmd.com/read/29791413/measurement-of-optical-fiber-parameters-and-thermal-core-diffusion-characteristics-by-digital-image-processing
#4
F Chavez-Gutierrez, A Martinez-Rios, D Toral-Acosta, D Torres-Armenta, J A Guerrero-Viramontes
The simultaneous measurement of the numerical aperture (NA) and mode field diameter (MFD) of single-mode fibers was performed on several commercial fibers by means of digital image processing of the output light projected into a screen. In addition, the changes induced by core diffusion in an ultra-high (UH) NA fiber at several heat depositions from a CO2 laser source were measured. The measurement method was demonstrated to be useful to monitor the adiabaticity of this process, by taking the product of the NA and MFD to verify if it remains constant...
May 20, 2018: Applied Optics
https://www.readbyqxmd.com/read/29791329/polarization-insensitive-ultra-broadband-and-compact-metamaterial-inspired-optical-absorber-via-wide-angle-and-highly-efficient-performances
#5
Mohammad Mehrabi, Hamid Rajabalipanah, Ali Abdolali, Majid Tayarani
Because of exhibiting extraordinary features, metamaterial absorbers have captured considerable attention in recent years, especially at visible frequencies. In this paper, a new design of a metamaterial-inspired perfect visible absorber (MIPVA) is investigated, which exhibits ultra-broadband, polarization-independent, and wide-angle performances. The proposed MIPVA provides a flat and near unity absorbance (>99%) in an ultra-broad range of radiation wavelengths from λ=500 to 625 nm, while retaining its convincing absorptivity over the entire visible wavelengths...
May 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29791313/acute-and-subacute-toxicity-of-aqueous-extract-of-the-tuber-of-kedrostis-africana-l-cogn-in-wistar-rats
#6
Jeremiah Oshiomame Unuofin, Gloria Aderonke Otunola, Anthony Jide Afolayan
Kedrostis africana (L.) Cogn (Cucurbitaceae) is used in South African traditional medicine and pharmacopoeia as an emetic, purgative and diuretic, and it is used against dropsy in the management of obesity. Aim of the study In this study, acute and subacute toxicity of aqueous extract of K. africanatuber was evaluated in male and female Wistar rats in order to assess its safety profile. Materials and methods In acute toxicity, the effects of a single oral dose (2,000 and 5,000 mg/kg) of aqueous extract was determined in both sexes...
May 23, 2018: Journal of Complementary & Integrative Medicine
https://www.readbyqxmd.com/read/29791052/high-performance-liquid-chromatography-quantification-of-enantiomers-of-a-dihydroxylated-tetrahydrofuran-natural-product
#7
Ke Li, Skye D Fissette, Tyler J Buchinger, Zoe E Middleton, Alistair Boyer, Weiming Li
Both enantiomers of petromyroxol are putative pheromones in sea lamprey (Petromyzon marinus). Here, we describe the separation and quantification of the petromyroxol enantiomers using high-performance liquid chromatography tandem mass spectrometry. The separation was tested on a wide range of chiral columns with normal phases, and effects of the chromatographic parameters such as mobile phase and temperature on the separation were optimized. The AD-H column showed the best separation of enantiomers with n-hexane and ethanol as the mobile phase...
May 23, 2018: Chirality
https://www.readbyqxmd.com/read/29790222/monitoring-the-hydrothermal-growth-of-cobalt-spinel-water-oxidation-catalysts-from-preparative-history-to-catalytic-activity
#8
Lukas Reith, Karla Lienau, Daniel S Cook, René Moré, Richard I Walton, Greta Ricarda Patzke
The hydrothermal growth of cobalt oxide spinel (Co₃O₄) nanocrystals from cobalt acetate precursors was monitored with in situ powder X-ray diffraction (PXRD) in combination with ex situ electron microscopy and vibrational spectroscopy. Kinetic data from in situ PXRD monitoring were analyzed using Sharp-Hancock and Gualtieri approaches, which both clearly indicate a change of the growth mechanism for reaction temperatures above 185°C. This mechanistic transition goes hand in hand with morphology changes that notably influence the photocatalytic oxygen evolution activity...
May 23, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29790214/predictability-of-demographic-rates-based-on-phylogeny-and-biological-similarity
#9
Judy Che-Castaldo, Christian Che-Castaldo, Maile C Neel
Lack of demographic data for most of the world's threatened species is a widespread problem that precludes viability-based status assessments for species conservation. A commonly suggested solution is to use data from species that are closely related or biologically similar to the focal species. This approach assumes that similar species and populations of the same species would have similar demographic rates, an assumption that has yet to be thoroughly tested. In this study, we constructed a Bayesian hierarchical model to predict demographic rates (intrinsic rate of population growth, r; recruit survival; juvenile survival; adult survival; fecundity) based on biological traits and phylogenetic relatedness, using data for 425 plant species...
May 23, 2018: Conservation Biology: the Journal of the Society for Conservation Biology
https://www.readbyqxmd.com/read/29790116/prediction-of-shunt-dependency-after-intracerebral-hemorrhage-and-intraventricular-hemorrhage
#10
Lu-Ting Kuo, Hsueh-Yi Lu, Jui-Chang Tsai, Yong-Kwang Tu
BACKGROUND: Spontaneous intracerebral hemorrhage is a disease with high morbidity and mortality. Extension of the hemorrhage into the ventricles is associated with the development of acute hydrocephalus and a poor outcome. Although it can be managed by external ventricular drainage (EVD), a subset of these patients require placement of permanent ventricular shunts. This study aimed to examine the factors on admission that can predict shunt dependency after EVD management. METHODS: Seventy-two patients who underwent EVD were included in this study...
May 22, 2018: Neurocritical Care
https://www.readbyqxmd.com/read/29789083/low-baseline-sympathetic-tone-correlates-to-a-greater-blood-pressure-change-in-the-cold-pressor-test
#11
Marylen Youssef, Azadeh Ghassemi, Catalina Marysol Carvajal Gonczi, Thiffya Arabi Kugathasan, Robert D Kilgour, Peter J Darlington
BACKGROUND: The cold pressor test (CPT) involves acute hand or foot exposure to cold water. CPT hyper-responders have unique traits, including risk of hypertension and a greater vasoconstrictor reserve and g force tolerance compared to hypo-responders. The purpose of this study was to uncover differences in cardiovascular and sympathetic biomarkers between responder types. METHODS: Healthy volunteers (N = 30) submerged one hand into cold water (3.3 ± 0.8°C) for 5 min...
June 1, 2018: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29788919/prediction-of-fluid-responsiveness-in-mechanically-ventilated-cardiac-surgical-patients-the-performance-of-seven-different-functional-hemodynamic-parameters
#12
Michael T Ganter, Martin Geisen, Sonja Hartnack, Omer Dzemali, Christoph K Hofer
BACKGROUND: Functional hemodynamic parameters such as stroke volume and pulse pressure variation (SVV and PPV) have been shown to be reliable predictors of fluid responsiveness in mechanically ventilated patients. Today, different minimally- and non-invasive hemodynamic monitoring systems measure functional hemodynamic parameters. Although some of these parameters are described by the same name, they differ in their measurement technique and thus may provide different results. We aimed to test the performance of seven functional hemodynamic parameters simultaneously in the same clinical setting...
May 22, 2018: BMC Anesthesiology
https://www.readbyqxmd.com/read/29788845/brain-perfusion-evaluated-by-regional-tissue-oxygenation-as-a-possible-quality-indicator-of-ongoing-cardiopulmonary-resuscitation-an-experimental-porcine-cardiac-arrest-study
#13
Tomáš Bouček, Mikuláš Mlček, Petra Krupičková, Michal Huptych, Tomáš Belza, Otomar Kittnar, Aleš Linhart, Jan Bělohlávek
INTRODUCTION: Relationship between regional tissue oxygenation (rSO2 ) and microcirculatory changes during cardiac arrest (CA) are still unclear. Therefore, we designed an experimental study to correlate rSO2 , microcirculation and systemic hemodynamic parameters in a porcine model of CA. METHODS: Ventricular fibrillation was induced in 24 female pigs (50±3kg) and left for three minutes untreated followed by five minutes of mechanical CPR. Regional and peripheral saturations were assessed by near-infrared spectroscopy, sublingual microcirculation by Sidestream Dark Field technology and continuous hemodynamic parameters, including systemic blood pressure (MAP) and carotid blood flow (CF), during baseline, CA and CPR periods...
May 2018: Perfusion
https://www.readbyqxmd.com/read/29788839/phenobarbital-pharmacokinetics-in-neonates-and-infants-during-extracorporeal-membrane-oxygenation
#14
Pavla Pokorná, Martin Šíma, Václav Vobruba, Dick Tibboel, Ondřej Slanař
INTRODUCTION: The disposition of drugs is potentially changed due to extracorporeal membrane oxygenation (ECMO) in neonates and infants. METHODS: The aim of the study was to evaluate the individual pharmacokinetics (PK) of phenobarbital and the effect of PK covariates in neonates and infants undergoing ECMO. Sixteen patients (7 neonates, 9 infants) treated with phenobarbital during ECMO (centrifugal-flow pump circuits) were enrolled in the PK study. Phenobarbital serum concentrations were measured using a fluorescence polarization immunoassay...
May 2018: Perfusion
https://www.readbyqxmd.com/read/29788801/perioperative-noninvasive-cardiac-output-monitoring-in-parturients-with-singleton-and-twin-pregnancies-undergoing-caesarean-section-under-spinal-anesthesia-with-prophylactic-phenylephrine-drip-a-prospective-observational-cohort-study
#15
S Orbach-Zinger, E Razinsky, I Bizman, S Firman, R Gat, A Davis, E Ashwal, A Shmueli, M Vaturi, R Gabbay-Benziv, L A Eidelman
INTRODUCTION: Spinal anesthesia is considered the gold standard anesthetic technique for cesarean deliveries (CD) but is associated with a high rate of hypotension. The recent international consensus recommends continuous prophylactic phenylephrine infusion (PPI) administered throughout CD to prevent hypotension. However little information is available on the hemodynamic profiles of women with twin pregnancies as compared to singleton pregnancies perioperatively. Therefore, in this study we aim we compare maternal hemodynamic changes both intraoperatively and postoperatively with the use of the NICAS bio impendence monitor in healthy singleton versus twin parturients undergoing CD deliveries with spinal anesthesia with PPI...
May 22, 2018: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29788009/the-effect-of-feeding-behavior-on-hypothalamus-in-obese-type-2-diabetic-rats-with-glucagon-like-peptide-1-receptor-agonist-intervention
#16
Ke Lu, Xiaoyan Chen, Jianhua Yan, Xinchun Li, Chen Huang, Qi Wan, Xuelian Deng, Qiao Zou
OBJECTIVE: To investigate the utility of intravoxel incoherent motion-diffusion weighted imaging (IVIM-DWI) derived parameters in hypothalamus for monitoring the effect of Exendin-4 (Ex-4) intervention on the feeding behavior in obese diabetic rats within early feeding. METHODS: 21 obese and 19 non-obese rats which were treated with streptozotocin injections were initially divided into an obese diabetes group (OD, n = 10), a non-obese diabetes group (D, n = 8), an obese group (O, n = 9) and a non-obese group (N, n = 9)...
May 23, 2018: Obesity Facts
https://www.readbyqxmd.com/read/29787978/persistence-of-bacterial-pathogens-antibiotic-resistance-genes-and-enterococci-in-tidal-creek-tributaries
#17
Chance E Jones, Anthony Maddox, Dorset Hurley, Andrei L Barkovskii
Intertidal creeks form the primary hydrologic link between estuaries and land-based activities on barrier islands. Fecal indicators Enterococcus spp. (Entero1), pathogens Shigella spp. (ipaH), Salmonella spp. (invA), E. coli of EHEC/EPEC groups (eaeA), E. coli of EAEC, EIEC, and UPEC groups (set1B), E. coli of STEC group (stx1); and tetracycline resistance genes (tet(B), tet(C), tet(D), tet(E), tet(K), tet(Q), tet(W), and tet(X); TRG) were detected in the headwater of Oakdale Creek (Sapelo Island, GA) receiving runoffs from Hog Hammock village...
May 19, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29786896/diagnostic-accuracy-of-bioelectrical-impedance-analysis-parameters-for-the-evaluation-of-malnutrition-in-patients-receiving-hemodialysis
#18
Angela Teodósio da Silva, Daniela Barbieri Hauschild, Yara Maria Franco Moreno, João Luiz Dornelles Bastos, Elisabeth Wazlawik
BACKGROUND: In the absence of a gold standard technique for assessing nutrition status in patients receiving hemodialysis (HD), we aimed to determine the diagnostic accuracy of single-frequency (50 kHz) bioelectrical impedance analysis parameters, resistance/height (R/H), reactance/height (Xc/H), and impedance/height (Z/H), and their cutoff points for malnutrition. METHODS: The reference standards, Subjective Global Assessment (SGA), Malnutrition Inflammation Score, and Nutritional Risk Screening 2002, were performed at baseline and then once a year for 2 years...
May 22, 2018: Nutrition in Clinical Practice
https://www.readbyqxmd.com/read/29786704/peri-implant-tissue-score-pits-as-a-measure-of-success-applied-to-869-dental-implants-from-a-retrospective-clinical-study
#19
Zbyněk Mazur, Ladislav Korábek, Daniel Mazur
OBJECTIVE: This article presents a methodology of a comprehensive score for assessment and monitoring of dental implant success from the peri-implant tissue perspective. It involves only standard and minimally invasive techniques accessible to general dental practices, without the need for special equipment. METHODS AND MATERIALS: The proposed score methodology combines existing consensual global knowledge regarding aspects of dental implant success with the standard examination tools accepted for regular recall assessment...
May 17, 2018: Quintessence International
https://www.readbyqxmd.com/read/29786580/-iron-deficiency-reduces-systemic-inflammation-in-obese-women
#20
Vadim M Nedoborenko, Anna V Lavrenko, Tatyana V Mamontova, Lyudmyla E Vesnina, Igor P Kaidashev
OBJECTIVE: Introduction: Iron plays an important role in the functioning of immunological monitoring due to its stimulating and differentiating effect on the immune system. Obesity is accompanied by chronic low grade inflammation and may be accompanied by a change in the concentration of iron in the blood serum. The aim of the study was to determine the level of systemic inflammation in iron deficiency anemia in patients with obesity. PATIENTS AND METHODS: Materials and methods: 40 women with iron deficiency anemia (30 with obesity and 10 without obesity) and 10 with obesity of a similar age (control group) participated in the study...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
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