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https://www.readbyqxmd.com/read/28801845/accurate-analytical-method-for-human-plasma-glucagon-levels-using-liquid-chromatography-high-resolution-mass-spectrometry-comparison-with-commercially-available-immunoassays
#1
Atsushi Miyachi, Masaki Kobayashi, Eri Mieno, Moritaka Goto, Kenichi Furusawa, Takashi Inagaki, Tadahiro Kitamura
Accurate quantification of plasma glucagon levels in humans is necessary for understanding the physiological and pathological importance of glucagon. Although several immunoassays for glucagon are available, they provide inconsistent glucagon values owing to cross-reactivity of the antibodies with peptides other than glucagon. To overcome this limitation, we developed a novel method to measure glucagon levels by a liquid chromatography (LC)-high-resolution mass spectrometry (HRMS) assay via parallel reaction monitoring (PRM) without immunoaffinity enrichment...
August 12, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28801691/a-new-data-processing-routine-facilitating-the-identification-of-surface-adhered-proteins-from-bacterial-conditioning-films-via-qcm-d-maldi-tof-ms
#2
Siegfried Hohmann, Anke Neidig, Boris Kühl, Frank Kirschhöfer, Jörg Overhage, Gerald Brenner-Weiß
Conditioning films are an important factor in the initiation and development of microbial biofilms, which are the leading cause of chronic infections associated with medical devices. Here, we analyzed the protein content of conditioning films formed after exposure to supernatants of cultures of the human pathogen Pseudomonas aeruginosa PAO1. Adhesion of substances from the supernatant was monitored using quartz crystal microbalance with dissipation monitoring (QCM-D) sensor chips modified with the commonly used implant material titanium dioxide (TiO2)...
August 11, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28767028/-the-dutch-college-of-general-practitioners-practice-guideline-suspicious-skin-lesions
#3
Z Damen-van Beek, W Opstelten
- The Dutch College of General Practitioners practice guideline 'Suspicious skin lesions' provides recommendations for diagnosis, treatment and referral for the most common premalignant and malignant skin disorders.- The practice guideline includes a flowchart which starts by looking at the colour and surface of the skin lesion to direct the general practitioner to the most likely diagnosis.- In case of strong suspicion of squamous cell carcinoma, keratoacanthoma or melanoma and in case of basal cell carcinoma or Bowen's disease with high-risk characteristics, the general practitioner will refer the patient to a dermatologist...
2017: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/28737421/matrix-effect-management-in-liquid-chromatography-mass-spectrometry-the-internal-standard-normalized-matrix-effect
#4
Amedeo De Nicolò, Marco Cantù, Antonio D'Avolio
LC-MS is becoming a standard for many applications, thanks to high sensitivity and selectivity; nevertheless, some issues are still present, particularly due to matrix effect (ME). Considering this, the use of optimal internal standards (ISs, usually stable-isotope labeled) is important, but not always possible because of cost or availability. Therefore, a deep investigation of the inter-lot variability of the ME and of the correcting power of the chosen IS (isotope-labeled or not) is mandatory. While the adoption of isotopically labeled ISs considered as a 'gold standard' to mitigate ME impact on analytical results, there is not consensus about the standard technique to evaluate it during method validation...
July 24, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28734287/on-the-thermophysical-and-transport-properties-of-3-he-and-4-he-a-bubble-interaction-potential-versus-state-of-the-art
#5
Michael Chrysos, Henri Piel
Three keynote thermophysical and transport properties of (3)He and (4)He, namely, the second virial coefficient, the shear viscosity, and the thermal conductivity, are reported for the "extended Dirac bubble potential" (EDbp), a novel model for He-He [M. Chrysos, J. Chem. Phys. 146, 024106 (2017)]. Comparisons with the experiment as well as with potentials with a proven track record and with the oversimplified Dbp are being made in the range 0.1-500 K to analyze the performance of the EDbp, which is shown here to emerge as a promising analytic model for He-He...
July 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28716204/a-protocol-to-identify-and-minimise-selection-and-information-bias-in-abattoir-surveys-estimating-prevalence-using-fasciola-hepatica-as-an-example
#6
Rebecca I Carroll, Andrew Forbes, David A Graham, Locksley L McV Messam
Abattoir surveys and findings from post-mortem meat inspection are commonly used to estimate infection or disease prevalence in farm animal populations. However, the function of an abattoir is to slaughter animals for human consumption, and the collection of information on animal health for research purposes is a secondary objective. This can result in methodological shortcomings leading to biased prevalence estimates. Selection bias can occur when the study population as obtained from the abattoir is not an accurate representation of the target population...
September 1, 2017: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/28704749/key-role-of-the-sorption-process-in-alteration-of-metal-and-metalloid-quantification-by-fouling-development-on-dgt-passive-samplers
#7
Delphine Devillers, Rémy Buzier, Malgorzata Grybos, Adeline Charriau, Gilles Guibaud
The DGT technique (diffusive gradients in thin films) is widely used for passive sampling of labile trace metals and metalloids in natural waters. Although development of fouling on the protective membranes is frequently observed, its effect on DGT sampling has been barely investigated. This study evaluates the influence of fouling on sampling of trace cationic metals Cd(II), Cu(II), Ni(II) and Pb(II) and oxyanions As(V), Cr(VI), Sb(V) and Se(VI). Fouling was developed in situ on polycarbonate membranes in four diverse natural freshwater environments and sampling alteration was assessed in controlled laboratory experiments...
July 10, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28699732/fundamental-and-practical-insights-on-the-packing-of-modern-high-efficiency-analytical-and-capillary-columns
#8
M Farooq Wahab, Darshan C Patel, Rasangi M Wimalasinghe, Daniel W Armstrong
New stationary phases are continuously developed for achieving higher efficiencies and unique selectivities. The performance of any new phase can only be assessed when the columns are effectively packed under high pressure to achieve a stable bed. The science of packing columns with stationary phases is one of the most crucial steps to achieve consistent and reproducible high-resolution separations. A poorly packed column can produce non-Gaussian peak shapes and lower detection sensitivities. Given the ever larger number of stationary phases, it is impossible to arrive at a single successful approach...
July 12, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28685969/the-cytochrome-p450-3a4-has-three-major-conformations-new-clues-to-drug-recognition-by-this-promiscuous-enzyme
#9
Lydia Benkaidali, François André, Gautier Moroy, Bahoueddine Tangour, François Maurel, Michel Petitjean
We computed the channels of the 3A4 isoform of the cytochrome P450 3A4 (CYP) on the basis of 24 crystal structures extracted from the Protein Data Bank (PDB). We identified three major conformations (denoted C, O1 and O2) using an enhanced version of the CCCPP software that we developed for the present work, while only two conformations (C and O(2) ) are considered in the literature. We established the flowchart of definition of these three conformations in function of the structural and physicochemical parameters of the ligand...
July 7, 2017: Molecular Informatics
https://www.readbyqxmd.com/read/28670801/australian-and-new-zealand-committee-on-resuscitation-neonatal-resuscitation-guidelines-2016
#10
Helen G Liley, Lindsay Mildenhall, Peter Morley
New Australian and New Zealand Neonatal Resuscitation guidelines reflect recent advances in neonatal resuscitation science, as critically appraised by the International Liaison Committee on Resuscitation. Substantial changes since the 2010 guidelines include: (i) updates to the Newborn Resuscitation Flowchart to include a greater emphasis on maintaining normal body temperature, and to emphasise the importance of beginning assisted ventilation by 1 min in infants who have absent or ineffective spontaneous breathing; (ii) updates to the physiology of the normal perinatal transition that resuscitation is trying to restore; (iii) recommendations for more frequent reinforcement of training, and for structured feedback for resuscitation training instructors; (iv) new guidance in relation to the timing of cord clamping for preterm newborn infants; (v) recommendation to monitor body temperature on admission to newborn units as a resuscitation quality indicator; (vi) suggestion to consider electrocardiographic (ECG) monitoring (as an adjunct to oximetry) to obtain more rapid and accurate estimation of heart rate during resuscitation; (vii) removal of previous suggestions to intubate meconium-exposed, non-vigorous term infants to suction the trachea; and (viii) suggestion to establish vascular access to enable administration of intravenous adrenaline (epinephrine) as soon as chest compressions are deemed to be needed...
July 2017: Journal of Paediatrics and Child Health
https://www.readbyqxmd.com/read/28651987/management-of-the-incidental-renal-mass%C3%A2-on-ct-a-white-paper-of-the-acr%C3%A2-incidental-findings-committee
#11
Brian R Herts, Stuart G Silverman, Nicole M Hindman, Robert G Uzzo, Robert P Hartman, Gary M Israel, Deborah A Baumgarten, Lincoln L Berland, Pari V Pandharipande
The ACR Incidental Findings Committee (IFC) presents recommendations for renal masses that are incidentally detected on CT. These recommendations represent an update from the renal component of the JACR 2010 white paper on managing incidental findings in the adrenal glands, kidneys, liver, and pancreas. The Renal Subcommittee, consisting of six abdominal radiologists and one urologist, developed this algorithm. The recommendations draw from published evidence and expert opinion and were finalized by informal iterative consensus...
June 22, 2017: Journal of the American College of Radiology: JACR
https://www.readbyqxmd.com/read/28641736/a-comprehensive-rehabilitation-program-for-posterior-instability-of-the-shoulder
#12
Lyn Watson, Simon Balster, Sarah Ann Warby, Jackie Sadi, Greg Hoy, Tania Pizzari
Posterior shoulder instability is recognised as being less prevalent than anterior instability, however the diagnosis of this pathology is easily overlooked or missed and this may contribute to an underestimation of prevalence. Recently, there has been increasing recognition of this condition and consequently a greater requirement for knowledge of diagnostic procedures and treatment directions. Currently there is limited research into the conservative management of posterior instability, although it is recommended as first-line treatment prior to surgical review, particularly in those with an atraumatic instability mechanism...
April 2017: Journal of Hand Therapy: Official Journal of the American Society of Hand Therapists
https://www.readbyqxmd.com/read/28617191/operator-models-for-delivering-municipal-solid-waste-management-services-in-developing-countries-part-b-decision-support
#13
Reka Soós, Andrew D Whiteman, David C Wilson, Cosmin Briciu, Sofia Nürnberger, Barbara Oelz, Ellen Gunsilius, Ekkehard Schwehn
This is the second of two papers reporting the results of a major study considering 'operator models' for municipal solid waste management (MSWM) in emerging and developing countries. Part A documents the evidence base, while Part B presents a four-step decision support system for selecting an appropriate operator model in a particular local situation. Step 1 focuses on understanding local problems and framework conditions; Step 2 on formulating and prioritising local objectives; and Step 3 on assessing capacities and conditions, and thus identifying strengths and weaknesses, which underpin selection of the operator model...
June 1, 2017: Waste Management & Research
https://www.readbyqxmd.com/read/28613918/new-sepsis-definition-sepsis-3-and-community-acquired-pneumonia-mortality-a-validation-and-clinical-decision-making-study
#14
Otavio T Ranzani, Elena Prina, Rosario Menéndez, Adrian Ceccato, Catia Cilloniz, Raul Méndez, Albert Gabarrus, Enric Barbeta, Gianluigi Li Bassi, Miquel Ferrer, Antoni Torres
RATIONALE: Sepsis-3 Task Force updated the clinical criteria for sepsis, excluding the need for systemic inflammatory response syndrome (SIRS) criteria. The clinical implications of the proposed flowchart including the quick Sequential (Sepsis-related) Organ Failure Assessment (qSOFA) and SOFA scores are unknown. OBJECTIVE: To perform a clinical decision-making analysis of Sepsis-3 in patients with community-acquired pneumonia (CAP). METHODS: Cohort study including adult patients with CAP from two Spanish university-hospitals...
June 14, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28600869/follow-up-on-the-characterization-of-peptidic-markers-in-hair-and-fur-for-the-identification-of-common-north-american-species
#15
Caroline Solazzo
RATIONALE: Species identification of hair is routinely done by microscopic analysis. Following previous studies that used protein analysis to characterize species markers in hair and wool, the present work aims at covering a larger number of species and to ultimately offer a method for rapid hair identification in forensics and archaeology. METHODS: Hair is mostly made of alpha-keratins; these proteins have only been sequenced in a handful of species and most animal families are under-represented...
September 15, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28599991/clinical-perspective-on-diagnostic-x-ray-examinations-of-pregnant-patients-what-to-take-into-account
#16
REVIEW
Peter Vock
Imaging during pregnancy has increased in frequency. Radiation protection is extremely important although tissue reactions of the conceptus, requiring a threshold dose of around 100mGy, are unlikely in the diagnostic use of X-rays and stochastic effects of cancerogenesis have a rather low risk (around 10(-4)/mGy for childhood cancer due to in utero exposure). This article will review the risk depending on dose and phase of pregnancy and the exposure by frequent examinations; it will then concentrate on the duties of an imaging department: screening for pregnancy, examination justification, planning and optimization, patient information, counseling, involving the patient in the decisions, and managing the situation of pregnant staff members...
June 6, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28595800/treatment-strategy-for-amyloid-hip-arthropathy-in-long-term-hemodialysis-patients
#17
Shigeo Fukunishi, Shoji Nishio, Yu Takeda, Tomokazu Fukui, Yuki Fujihara, Shohei Okahisa, Shinichi Yoshiya
BACKGROUND: The number of hemodialysis patients has been progressively increasing in our country. On the other hand, chronic hip arthropathy associated with long-term hemodialysis is a devastating problems affecting patients' quality of life. In our previous study, we proposed a classification system for radiological abnormalities seen in hemodialysis-related hip lesions. The purpose of the study was to propose the surgical strategy for hip disorders caused by long-term hemodialysis. METHODS: Patients with a history of hemodialysis for more than 10 years, 191 hip lesions in 165 consecutive patients who visited our institute due to hip symptoms...
June 5, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28590311/aspirin-challenge-and-desensitization-how-when-and-why
#18
Gabriele Cortellini, Cristiano Caruso, Antonino Romano
PURPOSE OF REVIEW: To investigate the current approach to aspirin challenge (drug provocation) and/or desensitization in patients with histories of hypersensitivity reactions to it, particularly in those with cardiovascular diseases. RECENT FINDINGS: The literature indicates that patients with coronary artery disease (CAD), including those with an acute coronary syndrome, may safely undergo low-dose aspirin challenge and/or desensitization. Recently, flowcharts regarding challenge/desensitization procedures with aspirin in patients with CAD and histories of aspirin hypersensitivity reactions have become available...
August 2017: Current Opinion in Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28579821/opioid-analgesics-related-pharmacokinetic-drug-interactions-from-the-perspectives-of-evidence-based-on-randomized-controlled-trials-and-clinical-risk-management
#19
REVIEW
Xiu-Qin Feng, Ling-Ling Zhu, Quan Zhou
BACKGROUND: Multimorbidity results in complex polypharmacy which may bear a risk of drug interactions. A better understanding of opioid analgesics combination therapy used for pain management could help warrant medication safety, efficacy, and economic relevance. Until now there has been no review summarizing the opioid analgesics-related pharmacokinetic drug interactions from the perspective of evidence based on randomized controlled trials (RCTs). METHOD: A literature search was performed using PubMed, MEDLINE, and the Cochrane Library, using a PRISMA flowchart...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28579143/energy-from-poultry-waste-an-aspen-plus-based-approach-to-the-thermo-chemical-processes
#20
Gianluca Cavalaglio, Valentina Coccia, Franco Cotana, Mattia Gelosia, Andrea Nicolini, Alessandro Petrozzi
A particular approach to the task of energy conversion of a residual waste material was properly experienced during the implementation of the national funded Enerpoll project. This project is a case study developed in the estate of a poultry farm that is located in a rural area of central Italy (Umbria Region); such a farm was chosen for the research project since it is almost representative of many similar small-sized breeding realties of the Italian regional context. The purpose of the case study was the disposal of a waste material (i...
May 31, 2017: Waste Management
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