journal
MENU ▼
Read by QxMD icon Read
search

Clinical Chemistry

journal
https://www.readbyqxmd.com/read/28821542/human-hepatocyte-metabolism-of-novel-synthetic-cannabinoids-mn-18-and-its-5-fluoro-analog-5f-mn-18
#1
Xingxing Diao, Jeremy Carlier, Mingshe Zhu, Marilyn A Huestis
BACKGROUND: In 2014, 2 novel synthetic cannabinoids, MN-18 and its 5-fluoro analog, 5F-MN-18, were first identified in an ongoing survey of novel psychoactive substances in Japan. In vitro pharmacological assays revealed that MN-18 and 5F-MN-18 displayed high binding affinities to human CB1 and CB2 receptors, with Ki being 1.65-3.86 nmol/L. MN-18 and 5F-MN-18 were scheduled in Japan and some other countries in 2014. Despite increasing prevalence, no human metabolism data are currently available, making it challenging for forensic laboratories to confirm intake of MN-18 or 5F-MN-18...
August 18, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28818830/high-speed-melting-analysis-the-effect-of-melting-rate-on-small-amplicon-microfluidic-genotyping
#2
Robert J Pryor, Joseph T Myrick, Robert A Palais, Scott O Sundberg, Jeanette Y Paek, Carl T Wittwer, Ivor T Knight
BACKGROUND: High-resolution DNA melting analysis of small amplicons is a simple and inexpensive technique for genotyping. Microfluidics allows precise and rapid control of temperature during melting. METHODS: Using a microfluidic platform for serial PCR and melting analysis, 4 targets containing single nucleotide variants were amplified and then melted at different rates over a 250-fold range from 0.13 to 32ü°C/s. Genotypes (n = 1728) were determined manually by visual inspection after background removal, normalization, and conversion to negative derivative plots...
August 17, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28814384/twenty-four-hour-biological-variation-profiles-of-cardiac-troponin-i-in-individuals-with-or-without-chronic-kidney-disease
#3
LETTER
Noreen van der Linden, Judith M Hilderink, Tom Cornelis, Dorien M Kimenai, Lieke J J Klinkenberg, William P van Doorn, Elisabeth J R Litjens, Jeroen D E van Suijlen, Luc J C van Loon, Otto Bekers, Jeroen P Kooman, Steven J R Meex
No abstract text is available yet for this article.
August 16, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28814383/high-resolution-accurate-mass-hram-mass-spectrometry-urine-steroid-profiling-in-the-diagnosis-of-adrenal-disorders
#4
Jolaine M Hines, Irina Bancos, Cristian Bancos, Raman D Singh, Aditya V Avula, William F Young, Stefan K Grebe, Ravinder J Singh
BACKGROUND: Steroid profiling is a promising diagnostic tool for those with adrenal tumors, Cushing syndrome (CS), and disorders of steroidogenesis. Our objective was to develop a multiple-steroid assay using liquid-chromatography, high-resolution, accurate-mass mass spectrometry (HRAM LC-MS) and to validate the assay in patients with various adrenal disorders. METHODS: We collected 24-h urine samples from 114 controls and 71 patients with adrenal diseases. An HRAM LC-MS method was validated for quantitative analysis of 26 steroid metabolites in hydrolyzed urine samples...
August 16, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28807979/single-stranded-dna-library-preparation-does-not-preferentially-enrich-circulating-tumor-dna
#5
Tina Moser, Peter Ulz, Qing Zhou, Samantha Perakis, Jochen B Geigl, Michael R Speicher, Ellen Heitzer
No abstract text is available yet for this article.
August 14, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28807978/high-sensitivity-troponin-star-player-but-no-lone-hero
#6
Richard Body
No abstract text is available yet for this article.
August 14, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28784692/surface-plasmon-resonance-is-an-analytically-sensitive-method-for-antigen-profiling-of-extracellular-vesicles
#7
Elmar L Gool, Ivan Stojanovic, Richard B M Schasfoort, Auguste Sturk, Ton G van Leeuwen, Rienk Nieuwland, Leon W M M Terstappen, Frank A W Coumans
BACKGROUND: Identification, enumeration, and characterization of extracellular vesicles (EVs) are hampered by the small size of EVs, a low refractive index, and low numbers of antigens on their surface. METHODS: We investigated the potential of a 48-multiplex surface plasmon resonance imaging (SPRi) system to perform EV phenotyping. Antigen surface density of 11 antigens was measured on the human breast cancer cell lines HS578T, MCF7, and SKBR3 and their EVs by use of both SPRi and the widely used flow cytometry (FCM)...
August 7, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28784691/dna-of-erythroid-origin-is-present-in-human-plasma-and-informs-the-types-of-anemia
#8
W K Jacky Lam, Wanxia Gai, Kun Sun, Raymond S M Wong, Rebecca W Y Chan, Peiyong Jiang, Natalie P H Chan, Winnie W I Hui, Anthony W H Chan, Cheuk-Chun Szeto, Siew C Ng, Man-Fai Law, K C Allen Chan, Rossa W K Chiu, Y M Dennis Lo
BACKGROUND: There is much interest in the tissue of origin of circulating DNA in plasma. Data generated using DNA methylation markers have suggested that hematopoietic cells of white cell lineages are important contributors to the circulating DNA pool. However, it is not known whether cells of the erythroid lineage would also release DNA into the plasma. METHODS: Using high-resolution methylation profiles of erythroblasts and other tissue types, 3 genomic loci were found to be hypomethylated in erythroblasts but hypermethylated in other cell types...
August 7, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28778937/gene-expression-signatures-in-circulating-tumor-cells-correlate-with-response-to-therapy-in-metastatic-breast-cancer
#9
Maren Bredemeier, Philippos Edimiris, Pawel Mach, Mikael Kubista, Robert Sjöback, Eva Rohlova, Katarina Kolostova, Siegfried Hauch, Bahriye Aktas, Mitra Tewes, Rainer Kimmig, Sabine Kasimir-Bauer
BACKGROUND: Circulating tumor cells (CTC) are thought to be an ideal surrogate marker to monitor disease progression in metastatic breast cancer (MBC). We investigated the prediction of treatment response in CTC of MBC patients on the basis of the expression of 46 genes. METHODS: From 45 MBC patients and 20 healthy donors (HD), 2 × 5 mL of blood was collected at the time of disease progression (TP0) and at 2 consecutive clinical staging time points (TP1 and TP2) to proceed with the AdnaTest EMT-2/StemCellSelect™ (QIAGEN)...
August 3, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28724625/amplification-of-misfolded-prion-proteins-in-blood-and-cerebrospinal-fluid-for-detection-of-creutzfeldt-jakob-disease
#10
Mari L DeMarco
No abstract text is available yet for this article.
July 19, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28720682/reducing-artifactual-egfr-t790m-mutations-in-dna-from-formalin-fixed-paraffin-embedded-tissue-by-use-of-thymine-dna-glycosylase
#11
Hongdo Do, Ramyar Molania, Paul L Mitchell, Rita Vaiskunaite, John D Murdoch, Alexander Dobrovic
BACKGROUND: False-positive EGFR T790M mutations have been reported in formalin-fixed lung tumors, but the cause of the false positives has not been identified. The T790M mutation results from a C>T change at the cytosine of a CpG dinucleotide. The presence or absence of methylation at this cytosine has different consequences following deamination, resulting in a thymine or uracil, respectively, both of which however result in an artifactual change. Uracil-DNA glycosylase (UDG) can be used to eliminate DNA templates with uracil residues but is not active against artifactual thymines...
July 18, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28720681/the-eubivas-project-within-and-between-subject-biological-variation-data-for-serum-creatinine-using-enzymatic-and-alkaline-picrate-methods-and-implications-for-monitoring
#12
Anna Carobene, Irene Marino, Abdurrahman Coŝkun, Mustafa Serteser, Ibrahim Unsal, Elena Guerra, William A Bartlett, Sverre Sandberg, Aasne Karine Aarsand, Marit Sverresdotter Sylte, Thomas Røraas, Una Ørvim Sølvik, Pilar Fernandez-Calle, Jorge Díaz-Garzón, Francesca Tosato, Mario Plebani, Niels Jonker, Gerhard Barla, Ferruccio Ceriotti
BACKGROUND: The European Federation of Clinical Chemistry and Laboratory Medicine (EFLM) European Biological Variation Study (EuBIVAS) has been established to deliver rigorously determined biological variation (BV) indices. EuBIVAS determined BV for serum creatinine using the enzymatic and alkaline picrate measurement methods. METHOD: In total, 91 healthy individuals (38 males, 53 females; age range, 21-69 years) were bled for 10 consecutive weeks at 6 European laboratories...
July 18, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28720680/quality-materials-for-quality-assurance-in-the-analysis-of-liquid-biopsy-samples
#13
EDITORIAL
Jason C H Tsang, K C Allen Chan
No abstract text is available yet for this article.
July 18, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28720679/potential-for-monitoring-gut-microbiota-for-diagnosing-infections-and-graft-versus-host-disease-in-cancer-and-stem-cell-transplant-patients
#14
Andrew Y Koh
BACKGROUND: Gut microbiota, the collective community of microorganisms inhabiting the intestine, have been shown to provide many beneficial functions for the host. Recent advances in next-generation sequencing and advanced molecular biology approaches have allowed researchers to identify gut microbiota signatures associated with disease processes and, in some cases, establish causality and elucidate underlying mechanisms. CONTENT: This report reviews 3 commonly used methods for studying the gut microbiota and microbiome (the collective genomes of the gut microorganisms): 16S rRNA gene sequencing, bacterial group or species-specific quantitative polymerase chain reaction (qPCR), and metagenomic shotgun sequencing (MSS)...
July 18, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28720678/standardization-of-free-thyroxine-measurements-allows-the-adoption-of-a-more-uniform-reference-interval
#15
Linde A C De Grande, Katleen Van Uytfanghe, Dries Reynders, Barnali Das, James D Faix, Finlay MacKenzie, Brigitte Decallonne, Akira Hishinuma, Bruno Lapauw, Paul Taelman, Paul Van Crombrugge, Annick Van den Bruel, Brigitte Velkeniers, Paul Williams, Linda M Thienpont
BACKGROUND: The IFCC Committee for Standardization of Thyroid Function Tests intended to standardize free thyroxine (FT4) immunoassays. We developed a Système International d'Unités traceable conventional reference measurement procedure (RMP) based on equilibrium dialysis and mass spectrometry. We describe here the latest studies intended to recalibrate against the RMP and supply a proof of concept, which should allow continued standardization efforts. METHODS: We used the RMP to target the standardization and reference interval (RI) panels, which were also measured by 13 manufacturers...
July 18, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28720677/synthetic-circulating-cell-free-dna-as-quality-control-materials-for-somatic-mutation-detection-in-liquid-biopsy-for-cancer
#16
Rui Zhang, Rongxue Peng, Ziyang Li, Peng Gao, Shiyu Jia, Xin Yang, Jiansheng Ding, Yanxi Han, Jiehong Xie, Jinming Li
BACKGROUND: Detection of somatic genomic alterations in tumor-derived cell-free DNA (cfDNA) in the plasma is challenging owing to the low concentrations of cfDNA, variable detection methods, and complex workflows. Moreover, no proper quality control materials are available currently. METHODS: We developed a set of synthetic cfDNA quality control materials (SCQCMs) containing spike-in cfDNA on the basis of micrococcal nuclease digestion carrying somatic mutations as simulated cfDNA and matched genomic DNA as genetic background to emulate paired tumor-normal samples in real clinical tests...
July 18, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28701316/diagnostic-performance-of-high-sensitivity-compared-with-contemporary-cardiac-troponin-i-for-the-diagnosis-of-acute-myocardial-infarction
#17
Yader Sandoval, Stephen W Smith, Sarah E Thordsen, Charles A Bruen, Michelle D Carlson, Kenneth W Dodd, Brian E Driver, Katherine Jacoby, Benjamin K Johnson, Sara A Love, Johanna C Moore, Anne Sexter, Karen Schulz, Nathaniel L Scott, Jennifer Nicholson, Fred S Apple
BACKGROUND: We examined the diagnostic performance of high-sensitivity cardiac troponin I (hs-cTnI) vs contemporary cTnI with use of the 99th percentile alone and with a normal electrocardiogram (ECG) to rule out acute myocardial infarction (MI) and serial changes (deltas) to rule in MI. METHODS: We included consecutive patients presenting to a US emergency department with serial cTnI on clinical indication (NCT02060760). Diagnostic performance for acute MI, including MI subtypes, and 30-day outcomes were examined...
July 12, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28687636/acute-graft-versus-host-disease-prognosis-are-biomarkers-ready-for-preemptive-clinical-trials
#18
Sophie Paczesny
No abstract text is available yet for this article.
July 7, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28687635/tracing-the-seeds-in-the-soil
#19
Stefan Werner, Klaus Pantel
No abstract text is available yet for this article.
July 7, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28687634/laboratory-developed-tests-a-legislative-and-regulatory-review
#20
REVIEW
Jonathan R Genzen, Jeffrey S Mohlman, Jerry L Lynch, Michael W Squires, Ronald L Weiss
BACKGROUND: Twenty-five years ago, the Food and Drug Administration (FDA) asserted in a draft document that "home brew" tests-now commonly referred to as laboratory-developed tests (LDTs)-are subject to the same regulatory oversight as other in vitro diagnostics (IVDs)(4). In 2010, the FDA began work on developing a proposed framework for future LDT oversight. Released in 2014, the draft guidance sparked an intense debate over potential LDT regulation. While the proposed guidance has not been implemented, many questions regarding LDT oversight remain unresolved...
July 7, 2017: Clinical Chemistry
journal
journal
31614
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"