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https://www.readbyqxmd.com/read/28811021/quantitative-analysis-of-major-and-trace-elements-in-nh4hf2-modified-silicate-rock-powders-by-laser-ablation-inductively-coupled-plasma-mass-spectrometry
#1
Wen Zhang, Zhaochu Hu, Yongsheng Liu, Wenwu Yang, Haihong Chen, Shenghong Hu, Hongyan Xiao
In this paper, we described a NH4HF2 digestion method as sample preparation for the rapid determination of major and trace elements in silicate rocks using laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS). Sample powders digested by NH4HF2 at 230 °C for 3 h form ultrafine powders with a typical grain size d80 < 8.5 μm, and various silicate rocks have a consistent grain morphology and size, allowing us to produce pressed powder pellets that have excellent cohesion and homogeneity suitable for laser ablation micro-analysis without the addition of binder...
August 29, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28717136/association-of-plasma-and-urinary-mutant-dna-with-clinical-outcomes-in-muscle-invasive-bladder-cancer
#2
K M Patel, K E van der Vos, C G Smith, F Mouliere, D Tsui, J Morris, D Chandrananda, F Marass, D van den Broek, D E Neal, V J Gnanapragasam, T Forshew, B W van Rhijn, C E Massie, N Rosenfeld, M S van der Heijden
Muscle Invasive Bladder Cancer (MIBC) has a poor prognosis. Whilst patients can achieve a 6% improvement in overall survival with Neo-Adjuvant Chemotherapy (NAC), many do not respond. Body fluid mutant DNA (mutDNA) may allow non-invasive identification of treatment failure. We collected 248 liquid biopsy samples including plasma, cell pellet (UCP) and supernatant (USN) from spun urine, from 17 patients undergoing NAC. We assessed single nucleotide variants and copy number alterations in mutDNA using Tagged-Amplicon- and shallow Whole Genome- Sequencing...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28636919/monitoring-quantitative-ultrasound-parameter-changes-in-a-cell-pellet-model-of-cell-starvation
#3
Lauren A Wirtzfeld, Elizabeth S L Berndl, Gregory J Czarnota, Michael C Kolios
Although it has previously been shown that the spectral analysis of ultrasound backscatter data is sensitive to the cellular changes caused by apoptosis, the sensitivity of spectral analysis to oncosis or ischemic cell death had not previously been studied. Whereas many anticancer treatments induce apoptosis, others induce cell starvation, or oncosis. HT-29 colon adenocarcinoma cells were formed into pellets and covered in phosphate-buffered saline at room temperature for 56 h. The pellets were imaged every 8 h with high-frequency (55 MHz) ultrasound and the raw radio-frequency data processed...
June 20, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28595972/17%C3%AE-ethynylestradiol-alters-the-peritoneal-immune-response-of-gilthead-seabream
#4
N E Gómez González, I Cabas, M C Rodenas, M Arizcun, V Mulero, A García Ayala
17α-Ethynylestradiol (EE2), a synthetic estrogen used in most oral contraceptives pills and hormone replacement therapies, is found in many water bodies, where it can modulate the fish immune response. EE2 acts as an endocrine disruptor in gilthead seabream, Sparus aurata L., a marine teleost fish of great economic value in Mediterranean aquaculture, as it induces hepatic vitellogenin gene (vtg) expression. Moreover, EE2 also alters the capacity of gilthead seabream to appropriately respond to infection although it does not behave as an immunosuppressor...
June 9, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28500602/a-new-mouse-model-for-introduction-of-aortic-aneurysm-by-implantation-of-deoxycorticosterone-acetate-pellets-or-aldosterone-infusion-in-the-presence-of-high-salt
#5
Shu Liu, Ming C Gong, Zhenheng Guo
Dysfunction of the renin-angiotensin-aldosterone system (RAAS) has been implicated in the etiologies of many cardiovascular diseases, including aortic aneurysm. In particular, the infusion of angiotensin II (Ang II) in the apolipoprotein E-deficient mice (apoE-/-) and low density lipoprotein receptor knockout mice (LDLR-/-) to induce aortic aneurysm has been extensively used in the field. In contrast, whether aldosterone (Aldo), an essential component of RAAS and a downstream effector of Ang II, is involved in aortic aneurysm is largely unknown...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28488006/ingestion-of-a-single-2-3%C3%A2-mm-lead-pellet-by-laying-roller-pigeon-hens-reduces-egg-size-and-adversely-affects-f1-generation-hatchlings
#6
Robert J Williams, Lawrence V Tannenbaum, Susan M Williams, Steven D Holladay, Richard C Tuckfield, Ajay Sharma, Danny Joe Humphrey, Robert M Gogal
Many aquatic and terrestrial avian species inadvertently ingest lead (Pb) in the form of spent or fragmented ammunition, mistaking it for food or grit. Previous studies in our laboratory have shown that ingestion of even a single 45-mg pellet can significantly increase blood-Pb levels and significantly inhibit the enzyme delta aminolevulinic-acid dehydratase (δ-ALAD) for a period of greater than 4 weeks. In the current study, proven breeder pairs of domestic Roller pigeons were housed in individual cages...
May 9, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28388309/a-comprehensive-assessment-of-exposures-to-respirable-dust-and-silica-in-the-taconite-mining-industry
#7
Jooyeon Hwang, Gurumurthy Ramachandran, Peter C Raynor, Bruce H Alexander, Jeffrey H Mandel
This study assessed the present-day levels (year 2010-2011) of exposure to respirable dust (RD) and respirable silica (RS) in taconite mines and evaluated how the mining process influences exposure concentrations. Personal samples (n = 679) were collected to assess exposure levels of workers to RD and RS at six mines in the Mesabi Iron Range of Minnesota. The RD and RS concentrations were measured using the National Institute for Occupational Safety and Health (NIOSH) 0600 and NIOSH 7500, respectively. Between-mine, between-SEG (similar exposure groups), within-SEG, and within-worker components of variability for RD and RS exposures were estimated using a two- or three-way nested random-effects ANOVA model...
May 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28333983/alterations-in-amino-acid-status-in-cats-with-feline-dysautonomia
#8
Bruce C McGorum, Herb W Symonds, Clare Knottenbelt, Tom A Cave, Susan J MacDonald, Joanna Stratton, Irene Leon, Judith A Turner, R Scott Pirie
Feline dysautonomia (FD) is a multiple system neuropathy of unknown aetiology. An apparently identical disease occurs in horses (equine grass sickness, EGS), dogs, rabbits, hares, sheep, alpacas and llamas. Horses with acute EGS have a marked reduction in plasma concentrations of the sulphur amino acids (SAA) cyst(e)ine and methionine, which may reflect exposure to a neurotoxic xenobiotic. The aim of this study was to determine whether FD cats have alterations in amino acid profiles similar to those of EGS horses...
2017: PloS One
https://www.readbyqxmd.com/read/28194448/divergent-relationships-between-fecal-microbiota-and-metabolome-following-distinct-antibiotic-induced-disruptions
#9
Jocelyn M Choo, Tokuwa Kanno, Nur Masirah Mohd Zain, Lex E X Leong, Guy C J Abell, Julie E Keeble, Kenneth D Bruce, A James Mason, Geraint B Rogers
The intestinal microbiome plays an essential role in regulating many aspects of host physiology, and its disruption through antibiotic exposure has been implicated in the development of a range of serious pathologies. The complex metabolic relationships that exist between members of the intestinal microbiota and the potential redundancy in functional pathways mean that an integrative analysis of changes in both structure and function are needed to understand the impact of antibiotic exposure. We used a combination of next-generation sequencing and nuclear magnetic resonance (NMR) metabolomics to characterize the effects of two clinically important antibiotic treatments, ciprofloxacin and vancomycin-imipenem, on the intestinal microbiomes of female C57BL/6 mice...
January 2017: MSphere
https://www.readbyqxmd.com/read/28027320/genomic-analysis-of-uterine-lavage-fluid-detects-early-endometrial-cancers-and-reveals-a-prevalent-landscape-of-driver-mutations-in-women-without-histopathologic-evidence-of-cancer-a-prospective-cross-sectional-study
#10
Navya Nair, Olga Camacho-Vanegas, Dmitry Rykunov, Matthew Dashkoff, Sandra Catalina Camacho, Cassie A Schumacher, Jonathan C Irish, Timothy T Harkins, Elijah Freeman, Isaac Garcia, Elena Pereira, Sviatoslav Kendall, Rachel Belfer, Tamara Kalir, Robert Sebra, Boris Reva, Peter Dottino, John A Martignetti
BACKGROUND: Endometrial cancer is the most common gynecologic malignancy, and its incidence and associated mortality are increasing. Despite the immediate need to detect these cancers at an earlier stage, there is no effective screening methodology or protocol for endometrial cancer. The comprehensive, genomics-based analysis of endometrial cancer by The Cancer Genome Atlas (TCGA) revealed many of the molecular defects that define this cancer. Based on these cancer genome results, and in a prospective study, we hypothesized that the use of ultra-deep, targeted gene sequencing could detect somatic mutations in uterine lavage fluid obtained from women undergoing hysteroscopy as a means of molecular screening and diagnosis...
December 2016: PLoS Medicine
https://www.readbyqxmd.com/read/27289195/effect-of-the-addition-of-phytosterols-and-tocopherols-on-streptococcus-thermophilus-robustness-during-industrial-manufacture-and-ripening-of-a-functional-cheese-as-evaluated-by-qpcr-and-rt-qpcr
#11
J Pega, S Rizzo, C D Pérez, L Rossetti, G Díaz, S M Ruzal, M Nanni, A M Descalzo
The quality of functional food products designed for the prevention of degenerative diseases can be affected by the incorporation of bioactive compounds. In many types of cheese, the performance of starter microorganisms is critical for optimal elaboration and for providing potential probiotic benefits. Phytosterols are plant lipophilic triterpenes that have been used for the design of functional dairy products because of their ability to lower serum cholesterol levels in humans. However, their effect on the starter culture behavior during cheesemaking has not yet been studied...
September 2, 2016: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/27232667/mesenchymal-stromal-cells-from-human-umbilical-cords-display-poor-chondrogenic-potential-in-scaffold-free-three-dimensional-cultures
#12
A Islam, A K Hansen, C Mennan, I Martinez-Zubiaurre
Many researchers world over are currently investigating the suitability of stromal cells harvested from foetal tissues for allogeneic cell transplantation therapies or for tissue engineering purposes. In this study, we have investigated the chondrogenic potential of mesenchymal stromal cells (MSCs) isolated from whole sections of human umbilical cord or mixed cord (UCSCs-MC), and compared them with cells isolated from synovial membrane (SMSCs), Hoffa's fat pad (HFPSCs) and cartilage. All MSCs were positive for surface markers including CD73, CD90, CD105, CD44, CD146 and CD166, but negative for CD11b, CD19, CD34, CD45 and HLA-DR in addition to CD106 and CD271...
2016: European Cells & Materials
https://www.readbyqxmd.com/read/27071311/cell-free-expression-of-the-app-transmembrane-fragments-with-alzheimer-s-disease-mutations-using-algal-amino-acid-mixture-for-structural-nmr-studies
#13
Olga V Bocharova, Anatoly S Urban, Kirill D Nadezhdin, Eduard V Bocharov, Alexander S Arseniev
Structural investigations need ready supply of the isotope labeled proteins with inserted mutations n the quantities sufficient for the heteronuclear NMR. Though cell-free expression system has been widely used in the past years, high startup cost and complex compound composition prevent many researches from the developing this technique, especially for membrane protein production. Here we demonstrate the utility of a robust, cost-optimized cell-free expression technique for production of the physiologically important transmembrane fragment of amyloid precursor protein, APP686-726, containing Alzheimer's disease mutations in the juxtamembrane (E693G, Arctic form) and the transmembrane parts (V717G, London form, or L723P, Australian form)...
July 2016: Protein Expression and Purification
https://www.readbyqxmd.com/read/27018876/large-scale-ion-current-based-proteomic-investigation-of-the-rat-striatal-proteome-in-a-model-of-short-and-long-term-cocaine-withdrawal
#14
Shichen Shen, Xiaosheng Jiang, Jun Li, Robert M Straubinger, Mauricio Suarez, Chengjian Tu, Xiaotao Duan, Alexis C Thompson, Jun Qu
Given the tremendous detriments of cocaine dependence, effective diagnosis and patient stratification are critical for successful intervention yet difficult to achieve due to the largely unknown molecular mechanisms involved. To obtain new insights into cocaine dependence and withdrawal, we employed a reproducible, reliable, and large-scale proteomics approach to investigate the striatal proteomes of rats (n = 40, 10 per group) subjected to chronic cocaine exposure, followed by either short- (WD1) or long- (WD22) term withdrawal...
May 6, 2016: Journal of Proteome Research
https://www.readbyqxmd.com/read/26976428/nanostructured-bi2te3-prepared-by-a-straightforward-arc-melting-method
#15
M Gharsallah, F Serrano-Sánchez, J Bermúdez, N M Nemes, J L Martínez, F Elhalouani, J A Alonso
Thermoelectric materials constitute an alternative source of sustainable energy, harvested from waste heat. Bi2Te3 is the most utilized thermoelectric alloy. We show that it can be readily prepared in nanostructured form by arc-melting synthesis, yielding mechanically robust pellets of highly oriented polycrystals. This material has been characterized by neutron powder diffraction (NPD), scanning electron microscopy (SEM), and electronic and thermal transport measurements. A microscopic analysis from NPD data demonstrates a near-perfect stoichiometry of Bi2Te3 and a fair amount of anharmonicity of the chemical bonds...
December 2016: Nanoscale Research Letters
https://www.readbyqxmd.com/read/26962471/comparison-of-two-methods-of-estradiol-replacement-their-physiological-and-behavioral-outcomes
#16
Laurivette Mosquera, Luz Shepherd, Aranza I Torrado, Yvonne M Torres-Diaz, Jorge D Miranda, Annabell C Segarra
Fluctuating sex steroids during the estrous or menstrual cycle of mammalian females make it difficult to determine their role on behaviors and physiology. To avoid this, many investigators ovariectomize their animals and administer progesterone, estradiol or a combination of both. Several different strategies are used to administer estradiol, which confounds interpretation of results. This study compared two methods of estradiol replacement implants: Silastic tubes filled with crystalline estradiol benzoate (E2) and commercially available estradiol benzoate pellets...
November 30, 2015: Journal of Veterinary Science & Technology
https://www.readbyqxmd.com/read/26410366/neuropilins-1-and-2-mediate-neointimal-hyperplasia-and-re-endothelialization-following-arterial-injury
#17
Caroline Pellet-Many, Vedanta Mehta, Laura Fields, Marwa Mahmoud, Vanessa Lowe, Ian Evans, Jorge Ruivo, Ian Zachary
AIMS: Neuropilins 1 and 2 (NRP1 and NRP2) play crucial roles in endothelial cell migration contributing to angiogenesis and vascular development. Both NRPs are also expressed by cultured vascular smooth muscle cells (VSMCs) and are implicated in VSMC migration stimulated by PDGF-BB, but it is unknown whether NRPs are relevant for VSMC function in vivo. We investigated the role of NRPs in the rat carotid balloon injury model, in which endothelial denudation and arterial stretch induce neointimal hyperplasia involving VSMC migration and proliferation...
November 1, 2015: Cardiovascular Research
https://www.readbyqxmd.com/read/26208869/haematologic-alterations-caused-by-ipomoea-carnea-in-experimental-poisoning-of-guinea-pig
#18
Enrique N García, María V Aguirre, Eduardo J Gimeno, Elvio E Rios, Ofelia C Acosta, Luciana A Cholich
Ipomoea carnea subsp. fistulosa (Convolvulaceae) causes poisoning of goats, sheep and cattle in many tropical and subtropical countries. The pathophysiology of this poisoning mainly involves an abnormal glycoprotein metabolism. The aim of this study was to describe the potential toxicity of I. carnea in a guinea pig model through its effect on hematopoiesis in a time course study of 40 days. Experimental poisoning was achieved by feeding animals with "small balls" prepared with milled leaves of I. carnea mixed with commercial crushed pellets for rodents...
October 2015: Experimental and Toxicologic Pathology: Official Journal of the Gesellschaft Für Toxikologische Pathologie
https://www.readbyqxmd.com/read/26078189/diet-induced-obesity-exacerbates-metabolic-and-behavioral-effects-of-polycystic-ovary-syndrome-in-a-rodent-model
#19
Ilana B Ressler, Bernadette E Grayson, Yvonne M Ulrich-Lai, Randy J Seeley
Polycystic ovary syndrome (PCOS) is the most common endocrinopathy affecting women of reproductive age. Although a comorbidity of PCOS is obesity, many are lean. We hypothesized that increased saturated fat consumption and obesity would exacerbate metabolic and stress indices in a rodent model of PCOS. Female rats were implanted with the nonaromatizable androgen dihydrotestosterone (DHT) or placebo pellets prior to puberty. Half of each group was maintained ad libitum on either a high-fat diet (HFD; 40% butter fat calories) or nutrient-matched low-fat diet (LFD)...
June 15, 2015: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/25907509/size-analysis-of-nanoparticles-extracted-from-w-o-emulsions
#20
C Nagelreiter, H Kotisch, T Heuser, C Valenta
Nanosized particles are frequently used in many different applications, especially TiO2 nanoparticles as physical filters in sunscreens to protect the skin from UV radiation. However, concerns have arisen about possible health issues caused by nanoparticles and therefore, the assessment of the occurrence of nanoparticles is important in pharmaceutical and cosmetic formulations. In a previous work of our group, a method was presented to extract nanoparticles from O/W emulsions. But to respond to the needs of dry and sensitive skin, sunscreens of the water-in-oil emulsion type are available...
July 5, 2015: International Journal of Pharmaceutics
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