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Multiple Chemical Sensitivities

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https://www.readbyqxmd.com/read/28728787/prenatal-co-exposure-to-manganese-and-depression-and-24-months-neurodevelopment
#1
Teresa Verenice Muñoz Rocha, Marcela Tamayo Y Ortiz, Martín Romero, Ivan Pantic, Lourdes Schnaas, David Bellinger, Birgit Claus Henn, Rosalind Wright, Robert O Wright, Mara Téllez-Rojo
BACKGROUND: Normal prenatal neurodevelopment follows stages that are potentially influenced by both chemical and psychosocial environments. Exposure to elevated manganese during this critically vulnerable period has been found to be neurotoxic. Independently, maternal prenatal depression has been associated with subsequent neurodevelopmental decrements in children. The association between child neurodevelopment and prenatal co-exposure to manganese and maternal depression has not been sufficiently studied...
July 17, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28726292/-in-visibility-online-the-benefits-of-online-patient-forums-for-people-with-a-hidden-illness-the-case-of-multiple-chemical-sensitivities-mcs
#2
Tarryn Phillips, Tyson Rees
Sufferers of medically unexplained conditions that are not observable in the clinic can experience multiple layers of invisibility: a lack of biomedical diagnosis; legal skepticism; political disinterest; and a loss of their prior social identity. For those with environmental sensitivities, this is compounded by literal hiddenness due to often being housebound. Drawing on an online survey of people with multiple chemical sensitivity, this article examines how the everyday experience of invisibility is mitigated by engaging with other patients online...
July 20, 2017: Medical Anthropology Quarterly
https://www.readbyqxmd.com/read/28724415/identification-and-characterization-of-the-antiplasmodial-activity-of-hsp90-inhibitors
#3
Claribel Murillo-Solano, Chunmin Dong, Cecilia G Sanchez, Juan C Pizarro
BACKGROUND: The recent reduction in mortality due to malaria is being threatened by the appearance of Plasmodium falciparum parasites that are resistant to artemisinin in Southeast Asia. To limit the impact of resistant parasites and their spread across the world, there is a need to validate anti-malarial drug targets and identify new leads that will serve as foundations for future drug development programmes targeting malaria. Towards that end, the antiplasmodial potential of several Hsp90 inhibitors was characterized...
July 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28723170/highly-efficient-multiple-anchored-fluorescent-probe-for-the-detection-of-aniline-vapor-based-on-synergistic-effect-chemical-reaction-and-pet
#4
Zinuo Jiao, Yu Zhang, Wei Xu, Xiangtao Zhang, Haibo Jiang, Pengcheng Wu, Yanyan Fu, Qingguo He, Huimin Cao, Jiangong Cheng
A multiple-anchored fluorescent probe ((((hexane-1,6-diylbis(2,7-bis(4-formyl)-phenyl)-9H-fluorine-9,9-diyl))-bis(hexane-6,1-diyl))-bis(9H-carbazole-9,3,6-triyl))-tetrakis(benzene-4,1-diyl))-tetraformyl-(8FP-2F) with eight aldehyde groups was designed and synthesized. The molecule has four branches and highly twisted structure. Furthermore, it tends to self-assemble into nanospheres, which is beneficial for gaseous analyte penetration and high fluorescence quantum efficiency. Among gaseous analytes, detection of aniline vapor is extraordinarily important in the control of environmental issues and human diseases...
May 26, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722448/chemical-sensing-on-a-single-sers-particle
#5
Ying Ma, Kittithat Promthaveepong, Nan Li
We report a new chemical sensing platform on a single surface-enhanced Raman scattering (SERS) particle. A cabbage-like Au microparticle (CLMP) with high SERS enhancement was applied as an ultrasensitive SERS substrate. A new Raman reporter bis[4,4'-[dithiodiphenyl azo-phenol] (DTDPAP) was synthesized to display multiple fingerprints and high reactivity toward sodium dithionite. The reaction of DTDPAP with sodium dithionite was in situ monitored by SERS on a single CLMP. The DTDPAP fingerprint change is dependent on the sodium dithionite concentration, providing a simple and sensitive method for sodium dithionite profiling...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28719868/quantitative-meta-analytic-approaches-for-the-systematic-synthesis-of-data-and-hazard-identification-a-case-study-of-decreased-pain-sensitivity-due-to-trimethylbenzene-exposure
#6
J Allen Davis, Andrew Kraft
Traditionally, human health risk assessments have relied on qualitative approaches for hazard identification, which involves weight of evidence determinations that integrate evidence across multiple studies. Recently, the National Research Council has recommended the development of quantitative approaches for evidence integration, including the application of meta-analyses, to help summarize and evaluate the results of a systematic review. In the meta-analytic approach, a pooled effect size is calculated after consideration of multiple potential confounding factors in order to determine whether the entire database under consideration indicates a chemical is a hazard...
July 15, 2017: Environmental Research
https://www.readbyqxmd.com/read/28719139/identification-of-metabolites-in-human-and-rat-urine-after-oral-administration-of-xiao-qing-long-tang-granule-using-ultra-high-performance-liquid-chromatography-combined-with-quadrupole-time-of-flight-mass-spectrometry
#7
Lei Zhou, Qiang Zhang, Wen Qi, Shuai Yan, Jialin Qu, Toshiaki Makino, Dan Yuan
Xiao-Qing-Long-Tang is a traditional Chinese formula used for the treatment of cold syndrome, bronchitis, and nasal allergies for thousands of years. However, the in vivo integrated metabolism of its multiple components and the active chemical constituents of Xiao-Qing-Long-Tang remain unknown. In this study, a method using ultra high performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry was established for the detection and identification of the metabolites in human and rat urine after oral administration of Xiao-Qing-Long-Tang...
July 18, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28713203/solvatochromic-fluorescent-probes-for-recognition-of-human-serum-albumin-in-aqueous-solution-insights-into-structure-property-relationship
#8
Bin Liu, Xiaoman Bi, Lucas McDonald, Yi Pang, Danqing Liu, Chengjun Pan, Lei Wang
Human serum albumin (HSA) as the most abundant protein in human blood plasma, serves many physiological functions. The dysregulation of HSA in serum or in urine is associated with various diseases, such as cirrhosis of liver, multiple myeloma, and cardiovascular disease. Therefore, to quantify HSA in body fluids with high selectivity and sensitivity is of great significance for disease diagnosis and preventive medicine. We herein developed a series of amide-functionalized flavonoids probes, 1-3, for recognition of human serum albumin...
November 29, 2016: Sensors and Actuators. B, Chemical
https://www.readbyqxmd.com/read/28712429/the-association-between-multiple-chemical-sensitivity-and-mental-illness-evidence-from-a-nationally-representative-sample-of-canadians
#9
Dylan Johnson, Ian Colman
OBJECTIVE: The goal of the present study was to investigate the association between multiple chemical sensitivity (MCS) and major depressive disorder (MDD), generalized anxiety disorder (GAD), MDD and GAD comorbidity (MDD+GAD), severe distress, and positive mental wellbeing. METHODS: This cross-sectional investigation was carried out using the 2012 Canadian Community Health Survey - Mental Health Component. The study population consisted of 21,977 individuals aged 20 and older, from Canada's ten provinces...
August 2017: Journal of Psychosomatic Research
https://www.readbyqxmd.com/read/28711794/sampling-designs-for-contaminant-temporal-trend-analyses-using-sedentary-species-exemplified-by-the-snails-bellamya-aeruginosa-and-viviparus-viviparus
#10
Ge Yin, Sara Danielsson, Anna-Karin Dahlberg, Yihui Zhou, Yanling Qiu, Elisabeth Nyberg, Anders Bignert
Environmental monitoring typically assumes samples and sampling activities to be representative of the population being studied. Given a limited budget, an appropriate sampling strategy is essential to support detecting temporal trends of contaminants. In the present study, based on real chemical analysis data on polybrominated diphenyl ethers in snails collected from five subsites in Tianmu Lake, computer simulation is performed to evaluate three sampling strategies by the estimation of required sample size, to reach a detection of an annual change of 5% with a statistical power of 80% and 90% with a significant level of 5%...
July 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28699743/development-and-validation-of-quantitative-uplc-ms-ms-assay-for-anticoagulant-rodenticides-in-liver
#11
Lori L Smith, Boying Liang, Marcia C Booth, Michael Filigenzi, Andriy Tkachenko, Cynthia L Gaskill
Anticoagulant rodenticides (ARs) are used to control rodent populations, however exposure to non-target animals occurs. A sensitive and rugged quantitative method was developed, optimized and validated for eight ARs in liver. Target analytes comprised two chemical classes: hydroxycoumarins (warfarin, coumachlor, dicoumarol, bromadiolone, brodifacoum and difethialone) and indanediones (diphacinone and chlorophacinone). In this method, liver extracts were cleaned up using dispersive solid phase extraction (d-SPE) to remove matrix interferences and analyzed by reverse phase ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS)...
July 12, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28696834/simultaneous-detection-of-the-tetrachloroethylene-metabolites-s-1-2-2-trichlorovinyl-glutathione-s-1-2-2-trichlorovinyl-l-cysteine-and-n-acetyl-s-1-2-2-trichlorovinyl-l-cysteine-in-multiple-mouse-tissues-via-ultra-high-performance-liquid-chromatography-electrospray
#12
Yu-Syuan Luo, Joseph A Cichocki, Thomas J McDonald, Ivan Rusyn
Tetrachloroethylene (perchloroethylene; PERC) is a high-production volume chemical and ubiquitous environmental contaminant that is hazardous to human health. Toxicity attributed to PERC is mediated through oxidative and glutathione (GSH) conjugation metabolites. The conjugation of PERC by glutathione-s-transferase to generate S-(1,2,2-trichlorovinyl) glutathione (TCVG), which is subsequently metabolized to form S-(1,2,2-trichlorovinyl)-L-cysteine (TCVC) is of special importance to human health. Specifically, TCVC may be metabolized to N-acetyl-S-(1,2,2-trichlorovinyl)-L-cysteine (NAcTCVC) which is excreted through urine, or to electrophilic metabolites that are nephrotoxic and mutagenic...
July 11, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28693723/determination-of-formylated-dna-and-rna-by-chemical-labeling-combined-with-mass-spectrometry-analysis
#13
Han-Peng Jiang, Ting Liu, Ning Guo, Lei Yu, Bi-Feng Yuan, Yu-Qi Feng
Nucleic acids carry diverse chemical modifications that exert critical influences in a variety of cellular processes in living organisms. In addition to methylation, the emerging DNA and RNA formylation has been reported to play functional roles in various physiological processes. However, the amounts of formylated DNA and RNA are extremely low and detection of DNA and RNA formylation is therefore a challenging task. To address this issue, we developed a strategy by chemical labeling combined with in-tube solid-phase microextraction - ultra high performance liquid chromatography - electrospray ionization - tandem mass spectrometry (in-tube SPME-UPLC-ESI-MS/MS) analysis for the sensitive determination of DNA and RNA formylation...
August 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28687885/determination-of-as-se-and-hg-in-fuel-samples-by-in-chamber-chemical-vapor-generation-icp-oes-using-a-flow-blurring%C3%A2-multinebulizer
#14
Miriam García, Miguel Ángel Aguirre, Antonio Canals
In this work, a new and simple analytical methodology based on in-chamber chemical vapor generation has been developed for the spectrochemical analysis of commercial fuel samples. A multiple nebulizer with three nebulization units has been employed for this purpose: One unit was used for sample introduction, while the other two were used for the necessary reagent introduction. In this way, the aerosols were mixed inside the spray chamber. Through this method, analyte transport and, therefore, sensitivity are improved in inductively coupled plasma-optical emission spectrometry...
July 7, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28685933/comparative-analysis-of-15-chemical-constituents-in-scutellaria-baicalensis-stem-leaf-from-different-regions-in-china-by-ultra-high-performance-liquid-chromatography-with-triple-quadrupole-tandem-mass-spectrometry
#15
Baofei Yan, Weijie Xu, Shulan Su, Shaoqing Zhu, Zhenhua Zhu, Huiting Zeng, Ming Zhao, Dawei Qian, Jin-Ao Duan
Scutellaria baicalensis is a traditional Chinese herbal medicine containing multiple components, which has been extensively used in clinics to treat epidemic febrile disease and hyperactivity cough. To get a deeper understanding about Scutellaria baicalensis stem-leaf resources, we analyzed 15 chemical constituents in 35 batches of Scutellaria baicalensis stem-leaf from eight regions in China. A rapid, simple and sensitive method using ultra high performance liquid chromatography coupled with triple quadrupole electrospray tandem mass spectrometry has been developed for the first time to simultaneously determine 15 chemical constituents (including phenolic acids and flavonoids) in Scutellaria baicalensis stem-leaf...
July 7, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28683180/multiconstituent-identification-in-root-branch-and-leaf-extracts-of-juglans-mandshurica-using-ultra-high-performance-liquid-chromatography-with-quadrupole-time-of-flight-mass-spectrometry
#16
Tian-Min Wang, Jing Liu, Tao Yi, Yan-Jun Zhai, Hui Zhang, Hu-Biao Chen, Shao-Qing Cai, Ting-Guo Kang, Zhong-Zhen Zhao
As a folk medicinal plant, Juglans mandshurica has been used for the treatment of cancer. Different organs of this plant showed anti-tumor activity in clinic and laboratory. Comparative identification of constituents in different plant organs is essential for investigation of the relationship between chemical constituents and pharmacological activities. For this aim, the roots, branches, and leaves of J. mandshurica were extracted with 50% v/v methanol and then subjected to ultra high performance liquid chromatography with quadrupole time-of-flight mass spectrometry analysis conducted under low and high energy...
July 6, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28676442/a-biochip-based-combined-immunoassay-for-detection-of-serological-status-of-borrelia-burgdorferi-in-lyme-borreliosis
#17
Na-Li Huang, Lei Ye, Hui Lv, Yi-Xin Du, Marion Schneider, Li-Bin Fan, Wei-Dong Du
BACKGROUND: Dithiobis (succinimidyl undecanoate) modified gold surface biochip were used as a combined immunoassay platform for concurrently detecting immune responses to Borrelia burgdorferi (B. burgdorferi) sensu lato antigens, flagellin, outer surface protein C, variable major protein-like sequence proteins, and 3 VlsE protein IR6 peptides. The peptides represented intrinsic Borrelia genospecies: B. burgdorferi sensu stricto, B. garinii, and B. afzelii, respectively. METHODS: Fourier transform infrared spectroscopy was utilized to validate the surface chemical characteristics on the modified gold surface...
July 1, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/28674455/heterologous-expression-of-the-yeast-tpo1p-or-pdr5p-membrane-transporters-in-arabidopsis-confers-plant-xenobiotic-tolerance
#18
Estelle Remy, María Niño-González, Cláudia P Godinho, Tânia R Cabrito, Miguel C Teixeira, Isabel Sá-Correia, Paula Duque
Soil contamination is a major hindrance for plant growth and development. The lack of effective strategies to remove chemicals released into the environment has raised the need to increase plant resilience to soil pollutants. Here, we investigated the ability of two Saccharomyces cerevisiae plasma-membrane transporters, the Major Facilitator Superfamily (MFS) member Tpo1p and the ATP-Binding Cassette (ABC) protein Pdr5p, to confer Multiple Drug Resistance (MDR) in Arabidopsis thaliana. Transgenic plants expressing either of the yeast transporters were undistinguishable from the wild type under control conditions, but displayed tolerance when challenged with the herbicides 2,4-D and barban...
July 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28672236/developing-and-applying-metamodels-of-high-resolution-process-based-simulations-for-high-throughput-exposure-assessment-of-organic-chemicals-in-riverine-ecosystems
#19
M Craig Barber, Kristin K Isaacs, Caroline Tebes-Stevens
As defined by Wikipedia (https://en.wikipedia.org/wiki/Metamodeling), "(a) metamodel or surrogate model is a model of a model, and metamodeling is the process of generating such metamodels." The goals of metamodeling include, but are not limited to (1) developing functional or statistical relationships between a model's input and output variables for model analysis, interpretation, or information consumption by users' clients; (2) quantifying a model's sensitivity to alternative or uncertain forcing functions, initial conditions, or parameters; and (3) characterizing the model's response or state space...
June 30, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28662111/mechanism-of-resistance-to-mesotrione-in-an-amaranthus-tuberculatus-population-from-nebraska-usa
#20
Shiv S Kaundun, Sarah-Jane Hutchings, Richard P Dale, Anushka Howell, James A Morris, Vance C Kramer, Vinod K Shivrain, Eddie Mcindoe
Amaranthus tuberculatus is a troublesome weed in corn and soybean production systems in Midwestern USA, due in part to its ability to evolve multiple resistance to key herbicides including 4-hydroxyphenylpyruvate dioxygenase (HPPD). Here we have investigated the mechanism of resistance to mesotrione, an important chemical for managing broadleaf weeds in corn, in a multiple herbicide resistant population (NEB) from Nebraska. NEB showed a 2.4-fold and 45-fold resistance increase to mesotrione compared to a standard sensitive population (SEN) in pre-emergence and post-emergence dose-response pot tests, respectively...
2017: PloS One
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