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Flame study

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https://www.readbyqxmd.com/read/28938469/taming-the-flames-targeting-white-adipose-tissue-browning-in-hypermetabolic-conditions
#1
Abdikarim Abdullahi, Marc G Jeschke
In this era of increased obesity and diabetes prevalence, the browning of white adipose tissue (WAT) has emerged as a promising therapeutic target to induce weight loss and improve insulin sensitivity in this population. The browning process entails a shift in the WAT from primarily storing excess energy to the dissipation of energy as heat. However, this idealistic view of WAT browning being the saviour of the metabolic syndrome has been criticized by studies in burns and cancer patients that have shown browning to be detrimental rather than being beneficial...
August 30, 2017: Endocrine Reviews
https://www.readbyqxmd.com/read/28938199/determination-of-lead-at-trace-levels-in-mussel-and-sea-water-samples-using-vortex-assisted-dispersive-liquid-liquid-microextraction-slotted-quartz-tube-flame-atomic-absorption-spectrometry
#2
Sezin Erarpat, Gözde Özzeybek, Dotse Selali Chormey, Sezgin Bakırdere
In this study, dispersive liquid-liquid microextraction (DLLME) and slotted quartz tube (SQT) were coupled to flame atomic absorption spectrometry (FAAS) to increase the sensitivity of lead. Conditions such as the formation of the lead-dithizone complex, efficiency of the DLLME method and the output of the SQT were systematically optimized to improve the detection limit for the analyte. The conventional FAAS system was improved upon by about 3.0 times with SQT-FAAS, 32 times with DLLME-FAAS and 142 times with DLLME-SQT-FAAS...
September 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28934967/building-a-resistance-to-ignition-testing-device-for-sunglasses-and-analysing-data-a-continuing-study-for-sunglasses-standards
#3
Renan Magri, Mauro Masili, Fernanda Oliveira Duarte, Liliane Ventura
BACKGROUND: Sunglasses popularity skyrocketed since its advent. The ongoing trend led to the creation of standards to protect consumers from injuries and secondary hazards due to spectacles use. In Brazil, the corresponding standard is NBR ISO 12312-1:2015 and since there is no mandatory testing, evaluating sunglasses performance provides an insight into compliance with the standard. In a continuing revision of sunglasses standards requirements, resistance to ignition is one of the concerns, since sunglasses should be protected from burning into flames at a pre-determined temperature, which may protect user of getting their sunglasses into flames if some, cigarette sparks reaches the spectacles, as an example...
September 21, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28934090/adipogenic-effects-and-gene-expression-profiling-of-firemaster%C3%A2-550-components-in-human-primary-preadipocytes
#4
Emily W Y Tung, Vian Peshdary, Remi Gagné, Andrea Rowan-Carroll, Carole L Yauk, Adéle Boudreau, Ella Atlas
BACKGROUND: Exposure to flame retardants has been associated with negative health outcomes including metabolic effects. As polybrominated diphenyl ether flame retardants were pulled from commerce, human exposure to new flame retardants such as Firemaster® 550 (FM550) has increased. Although previous studies in murine systems have shown that FM550 and its main components increase adipogenesis, the effects of FM550 in human models have not been elucidated. OBJECTIVES: The objectives of this study were to determine if FM550 and its components are active in human preadipocytes, and to further investigate their mode of action...
September 14, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28932958/sensitive-determination-of-cadmium-using-solidified-floating-organic-drop-microextraction-slotted-quartz-tube-flame-atomic-absorption-spectroscopy
#5
Erhan Akkaya, Dotse Selali Chormey, Sezgin Bakırdere
In this study, solidified floating organic drop microextraction (SFODME) by 1-undecanol was combined with slotted quartz tube flame atomic absorption spectrometry (SQT-FAAS) for the determination of cadmium at trace levels. Formation of a complex with 4,4'-dimethyl-2,2'-bipyridine facilitated the extraction of cadmium from aqueous solutions. Several chemical variables were optimized in order to obtain high extraction outputs. Parameters such as concentration of the ligand, pH, and amount of buffer solution were optimized to enhance the formation of cadmium complex...
September 20, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28927605/enhanced-flame-retardant-properties-of-cellulose-fibers-by-incorporation-of-acid-resistant-magnesium-oxide-microcapsules
#6
Ximei Li, Keke Zhang, Ran Shi, Xiaomei Ma, Liwen Tan, Quan Ji, Yanzhi Xia
Magnesium oxide (MgO) microcapsules were synthesized via in-situ emulsion polymerization as confirmed by Fourier transform infrared spectroscopy and scanning electron microscopy. Pure MgO and the MgO microcapsules were separately incorporated into cellulose fibers by blend wet spinning. Inductively coupled plasma-emission spectroscopy results revealed that cellulose fibers modified with the MgO microcapsules contained more Mg(2+) than those modified by pure MgO, indicating more acid resistance. The flammability and thermal degradation of modified cellulose fibers (cellulose-Mg fibers) were studied by calorimeter (CONE), thermogravimetry (TGA), and the determination of the limiting oxygen index (LOI)...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927487/ultrasonically-dispersed-ionic-liquid-based-microextraction-of-lead-in-biological-samples-of-malnourished-children-prior-to-analysis-by-flame-atomic-absorption-spectrometry
#7
Sehrish Talpur, Tasneem Gul Kazi, Hassan Imran Afridi, Farah Naz Talpur, Sooraj Nizamani, Anjum Lashari, Asma Akhtar, Mustafa Khan
In the present study, a simple ultrasonically dispersed modified liquid-phase microextraction method was developed for the extraction of lead (Pb) from blood and scalp hair samples of malnourished children (MNC). The complexation of Pb was executed by means of the complexing agent, ammonium pyrrolidinedithiocarbamate (APDC), whereas extraction was carried out through the ionic liquid (IL), 1-butyl-3-methylimidazolium hexafluorophosphate. Ultrasound energy was used for the dispersion and extraction of the metal complex into an IL because it enhances the extraction of the metal complex into infinite IL drops at a temperature range of 40–80°C for 1–5 min...
September 19, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28923725/petroleum-degradation-by-endophytic-streptomyces-spp-isolated-from-plants-grown-in-contaminated-soil-of-southern-algeria
#8
Hafida Baoune, Aminata Ould El Hadj-Khelil, Graciela Pucci, Pedro Sineli, Lotfi Loucif, Marta Alejandra Polti
Petroleum hydrocarbons are well known by their high toxicity and recalcitrant properties. Their increasing utilization around worldwide led to environmental contamination. Phytoremediation using plant-associated microbe is an interesting approach for petroleum degradation and actinobacteria have a great potential for that. For this purpose, our study aimed to isolate, characterize, and assess the ability of endophytic actinobacteria to degrade crude petroleum, as well as to produce plant growth promoting traits...
September 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28919410/tetrabromobisphenol-a-disturbs-zinc-homeostasis-in-cultured-cerebellar-granule-cells-a-dual-role-in-neurotoxicity
#9
Elzbieta Zieminska, Anna Ruszczynska, Jerzy W Lazarewicz
The brominated flame retardant tetrabromobisphenol A (TBBPA) has recognized neurotoxic properties mediated by intracellular Ca(2+) imbalance and oxidative stress. Although these factors are known to trigger the release of Zn(2+) from intracellular stores, the effects of TBBPA on Zn(2+) homeostasis in neurons and the role of Zn(2+)in TBBPA neurotoxicity have not yet been studied. Therefore, we investigated zinc transients in primary cultures of rat cerebellar granule cells and assessed their involvement in TBBPA neurotoxicity...
September 14, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28917944/tetrabromoethylcyclohexane-affects-gonadal-differentiation-and-development-in-the-frog-pelophylax-nigromaculatus
#10
Peng-Yan Liu, Tan Meng, Yuan-Yuan Li, Man Cai, Xing-Hong Li, Juan Chen, Zhan-Fen Qin
Tetrabromoethylcyclohexane (TBECH), an additive brominated flame retardant, has been shown to have an androgenic activity in vitro. In the present study, we aimed to investigate the effects of TBECH on gonadal differentiation and development in the frog Pelophylax nigromaculatus, an amphibian species sensitive to androgenic chemicals, and to assess the androgenic activity of TBECH in vivo. P. nigromaculatus tadpoles were exposed to TBECH (1, 10, 100nM) from Gosner stage 24 to complete metamorphosis, and to 5α-dihydrotestosterone (DHT) as a positive control...
September 9, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28917262/determination-of-several-element-levels-in-hardaliye-beverages-using-flame-atomic-absorption-spectrometry-after-ultrasound-probe-extraction
#11
Dilek Bakircioglu, Nukte Topraksever, Yasemin Bakircioglu Kurtulus
In the present study, concentrations of calcium (Ca), copper (Cu), magnesium (Mg), manganese (Mn), sodium (Na), and zinc (Zn) in hardaliye samples produced in Turkey were determined by flame atomic absorption spectrometry after ultrasound probe extraction (UPE), microwave-assisted extraction (MAE), and wet extraction procedures. At present, there is limited work in the literature on UPE for the determination of trace elements in beverage samples. Our single-correlation analysis showed that the elements studied with the UPE method in hardaliye were strongly correlated with the MAE procedure...
September 1, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28916946/association-between-placental-polycyclic-aromatic-hydrocarbons-pahs-oxidative-stress-and-preterm-delivery-a-case-control-study
#12
Priyanka Agarwal, Laxmi Singh, Madhu Anand, Ajay Taneja
Polycyclic aromatic hydrocarbons are known to disturb the antioxidant defense system, which may indirectly contribute to induction of early pregnancy in women. Therefore, the present investigation was designed to offer preliminary information about exposure to PAHs by estimating their placental levels and its association with oxidative stress as well as with preterm birth. Placenta tissue samples were drawn after delivery from 84 healthy pregnant women, recruited at a local nursing home of Agra, India, and levels of PAHs were quantified by gas chromatograph equipped with flame ionization detector...
September 15, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28916455/essential-oil-composition-and-anti-acanthamoeba-studies-of-teucrium-ramosissimum
#13
Nessrine Ghazouani, Ines Sifaoui, Olfa Bachrouch, Manef Abderrabba, José E Pinero, Jacob Lorenzo-Morales
The aim of the present study was to evaluate the chemical composition of the essential oil obtained from the aerial parts of T. ramosissimum by hydrodistillation and to investigate their anti-Acanthamoeba activity. Identification and quantification were realized by gas chromatography-mass spectrometry (GC-MS) and gas chromatography with flame ionization detection by (GC-FID). Sixty-eight compounds representing 97.78% of the essential oil were identified, of which δ-cadinene (18.63%), δ-cadinol (18.70%), β-eudesmol (12...
September 12, 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/28916131/chemical-exposures-in-recently-renovated-low-income-housing-influence-of-building-materials-and-occupant-activities
#14
Robin E Dodson, Julia O Udesky, Meryl D Colton, Martha McCauley, David E Camann, Alice Y Yau, Gary Adamkiewicz, Ruthann A Rudel
Health disparities in low-income communities may be linked to residential exposures to chemicals infiltrating from the outdoors and characteristics of and sources in the home. Indoor sources comprise those introduced by the occupant as well as releases from building materials. To examine the impact of renovation on indoor pollutants levels and to classify chemicals by predominant indoor sources, we collected indoor air and surface wipes from newly renovated "green" low-income housing units in Boston before and after occupancy...
August 14, 2017: Environment International
https://www.readbyqxmd.com/read/28913969/spray-inlet-microwave-plasma-torch-ionization-tandem-mass-spectrometry-for-the-direct-detection-of-drug-samples-in-liquid-solutions
#15
Meng Miao, Gaosheng Zhao, Yaliang Wang, Li Xu, Junguo Dong, Ping Cheng
RATIONALE: Drug abuse or dependence results in a series of social problems, including crime and traffic accidents. Spray inlet microwave plasma torch tandem mass spectrometry (MPT-MS/MS) was developed and used for the direct detection of such drugs in liquid solutions. METHODS: Drug sample solutions were directly sprayed into the flame of MPT by a sampling pump and the ions produced by Penning ionization and ion-molecule reactions were guided into a QTOF tandem mass spectrometer for mass analysis...
September 14, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28911793/passive-air-sampling-of-polybrominated-diphenyl-ethers-in-new-delhi-kolkata-mumbai-and-chennai-levels-homologous-profiling-and-source-apportionment
#16
Paromita Chakraborty, Gan Zhang, Hairong Cheng, Prithiviraj Balasubramanian, Jun Li, Kevin C Jones
Several studies in the recent past reported new sources for industrial persistent organic pollutants (POPs) from metropolitan cities of India. To fill the data gap for atmospheric polybrominated diphenyl ethers (PBDEs), polyurethane foam disk passive air sampling (PUF-PAS) was conducted along urban-suburban-rural transects in four quadrilateral cities viz., New Delhi, Kolkata, Mumbai and Chennai from northern, eastern, western and southern India respectively. Average concentration of Σ8PBDEs in pg/m(3) for New Delhi, Kolkata, Mumbai and Chennai were 198, 135, 264 and 144 respectively...
September 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28910606/multivariate-analysis-as-a-key-tool-in-chemotaxonomy-of-brinjal-eggplant-african-eggplants-and-wild-related-species
#17
Łukasz P Haliński, John Samuels, Piotr Stepnowski
The brinjal eggplant (Solanum melongena L.) is an important vegetable species worldwide, while African eggplants (S. aethiopicum L., S. macrocarpon L.) are indigenous vegetable species of local significance. Taxonomy of eggplants and their wild relatives is complicated and still unclear. Hence, the objective of the study was to clarify taxonomic position of cultivars and landraces of brinjal, its wild relatives and African eggplant species and their wild ancestors using chemotaxonomic markers and multivariate analysis techniques for data processing, with special attention paid to the recognition of markers characteristic for each group of the plants...
September 11, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28902518/the-reaction-between-sodium-hydroxide-and-atomic-hydrogen-in-atmospheric-and-flame-chemistry
#18
Juan Carlos Gomez Martin, Claire Seaton, Marcelo Pessoa De Miranda, John Maurice Campbell Plane
We report the first direct kinetic study of the gas-phase reaction NaOH + H → Na + H2O, which is central to the chemistry of sodium in the upper atmosphere and in flames. The reaction was studied in a fast flow tube where NaOH was observed by multi-photon ionization and time-of-flight mass spectrometry, yielding k(NaOH + H, 230 - 298 K) = (3.8 ± 0.8)  10-11 cm3 molecule -1 s-1 (at 2σ confidence level), showing no significant temperature dependence over the indicated temperature range and essentially in agreement with previous estimates of the rate constant in hydrogen-rich flames...
September 13, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28902173/concept-for-recycling-waste-biomass-from-the-sugar-industry-for-chemical-and-biotechnological-purposes
#19
Magdalena Modelska, Joanna Berlowska, Dorota Kregiel, Weronika Cieciura, Hubert Antolak, Jolanta Tomaszewska, Michał Binczarski, Elzbieta Szubiakiewicz, Izabela A Witonska
The objective of this study was to develop a method for the thermally-assisted acidic hydrolysis of waste biomass from the sugar industry (sugar beet pulp and leaves) for chemical and biotechnological purposes. The distillates, containing furfural, can be catalytically reduced directly into furfurayl alcohol or tetrahydrofurfuryl alcohol. The sugars present in the hydrolysates can be converted by lactic bacteria into lactic acid, which, by catalytic reduction, leads to propylene glycol. The sugars may also be utilized by microorganisms in the process of cell proliferation, and the biomass obtained used as a protein supplement in animal feed...
September 13, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28900326/the-relationship-between-serum-selenium-and-zinc-with-gastroesophageal-cancers-in-the-southeast-of-iran
#20
Seyed Mehdi Hashemi, Mohamadali Mashhadi, Alireza Ansari Moghaddam, Javad Yousefi, Ahmad Dizangian Mofrad, Masoud Sadeghi, Abolghasem Allahyari
BACKGROUND: Selenium (Se) and zinc (Zn) have antioxidant and anticancer properties. OBJECTIVE: The aim of this study was to evaluate the serum levels of Se and Zn and the correlation between the levels of these two elements with risk of incidence of esophageal cancer (EC) and gastric cancer (GC). MATERIALS AND METHODS: In a case-control study, we selected sixty patients with GC or EC as the intervention group and 120 age-matched individuals as the control group...
April 2017: Indian Journal of Medical and Paediatric Oncology
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