keyword
MENU ▼
Read by QxMD icon Read
search

Mass spectrometry

keyword
https://www.readbyqxmd.com/read/27933748/exploring-glucocorticoid-receptor-agonists-mechanism-of-action-through-mass-cytometry-and-radial-visualizations
#1
Yann Abraham, Bertran Gerrits, Marie-Gabrielle Ludwig, Michael Rebhan, Caroline Gubser Keller
Recent advances in combining flow cytometry and mass spectrometry have led to the development of mass cytometry, allowing for the interrogation of complex cell populations on an unprecedented scale. The volumes and high dimensionality of mass cytometry data pose significant challenges in terms of analysis and visualization. We implement a method called Radviz (1-3), where multidimensional single cell data can be visualized as a projection that maintains the original dimensions and data complexity whilst facilitating analysis and visualization...
December 9, 2016: Cytometry. Part B, Clinical Cytometry
https://www.readbyqxmd.com/read/27933719/depth-profiling-cross-linked-poly-methyl-methacrylate-films-a-tof-sims-approach
#2
Soheila Naderi-Gohar, Kevin M H Huang, Yiliang Wu, Woon Ming Lau, Heng-Yong Nie
RATIONALE: In order to determine the degree of cross-linking on the surface and its variations in a nanometer-scale depth of organic materials, we developed an approach based on time-of-flight secondary ion mass spectrometry (TOF-SIMS), which provides rich chemical information in the form of fragment ions. TOF-SIMS is extremely surface sensitive and capable of depth profiling with the use of a sputter ion beam to remove controllable amounts of substance. METHODS: Poly(methyl methacrylate) (PMMA) films spin-coated on a Si substrate were cross-linked using a recently developed, surface sensitive, hyperthermal hydrogen projectile bombardment technique...
December 9, 2016: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/27933670/gold-i-fluorohalides-theory-and-experiment
#3
Babil Menjón, Miguel Baya, Alberto Pérez-Bitrián, Sonia Martínez-Salvador, José María Casas, Jesús Orduna
The anionic trifluoromethyl-gold(I) derivatives [CF₃AuX]⁻, which have been prepared and isolated as their [PPh₄]⁺ salts in good yield, undergo thermally-induced difluorocarbene extrusion in the gas phase giving rise to the mixed gold(I) fluorohalide complexes [F-Au-X]⁻ (X = Cl, Br, I). These triatomic species have been detected by tandem mass spectrometry (MS2) experiments and their properties have been analyzed by DFT methods. The CF₂ extrusion mechanism from the Au-CF₃ moiety serves as a model for the CF₂ insertion into the Au-F bond, since both reactivity channels are connected by the microreversibility principle...
December 9, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27933669/characterization-of-nitrated-sugar-alcohols-by-atmospheric-pressure-chemical-ionization-mass-spectrometry
#4
Alla Ostrinskaya, Jude A Kelley, Roderick R Kunz
RATIONALE: The nitrated sugar alcohols mannitol hexanitrate (MHN), sorbitol hexanitrate (SHN) and xylitol pentanitrate (XPN) are in the same class of compounds as the powerful military grade explosive pentaerythritol tetranitrate (PETN) and the homemade explosive erythritol tetranitrate (ETN) but, unlike for PETN and ETN, ways to detect MHN, SHN and XPN by mass spectrometry (MS) have not been fully investigated. METHODS: Atmospheric-pressure chemical-ionization mass spectrometry (APCI-MS) was used to detect ions characteristic of nitrated sugar alcohols...
December 9, 2016: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/27933609/the-role-of-electrical-and-jasmonate-signalling-in-the-recognition-of-captured-prey-in-the-carnivorous-sundew-plant-drosera-capensis
#5
Miroslav Krausko, Zdeněk Perutka, Marek Šebela, Olga Šamajová, Jozef Šamaj, Ondřej Novák, Andrej Pavlovič
The carnivorous sundew plant (Drosera capensis) captures prey using sticky tentacles. We investigated the tentacle and trap reactions in response to the electrical and jasmonate signalling evoked by different stimuli to reveal how carnivorous sundews recognize digestible captured prey in their traps. We measured the electrical signals, phytohormone concentration, enzyme activities and Chla fluorescence in response to mechanical stimulation, wounding or insect feeding in local and systemic traps. Seven new proteins in the digestive fluid were identified using mass spectrometry...
December 9, 2016: New Phytologist
https://www.readbyqxmd.com/read/27933548/metabolic-characterization-of-acutely-isolated-hippocampal-and-cerebral-cortical-slices-using-u-13-c-glucose-and-1-2-13-c-acetate-as-substrates
#6
Laura F McNair, Rasmus Kornfelt, Anne B Walls, Jens V Andersen, Blanca I Aldana, Jakob D Nissen, Arne Schousboe, Helle S Waagepetersen
Brain slice preparations from rats, mice and guinea pigs have served as important tools for studies of neurotransmission and metabolism. While hippocampal slices routinely have been used for electrophysiology studies, metabolic processes have mostly been studied in cerebral cortical slices. Few comparative characterization studies exist for acute hippocampal and cerebral cortical slices, hence, the aim of the current study was to characterize and compare glucose and acetate metabolism in these slice preparations in a newly established incubation design...
December 8, 2016: Neurochemical Research
https://www.readbyqxmd.com/read/27933517/a-novel-mutation-in-the-fibrinogen-a%C3%AE-chain-gly13arg-fibrinogen-nanning-causes-congenital-dysfibrinogenemia-associated-with-defective-peptide-a-release
#7
Jie Yan, Meiling Luo, Peng Cheng, Lin Liao, Xuelian Deng, Donghong Deng, Faquan Lin
Dysfibrinogenemia is characterized by blood coagulation dysfunction induced by an abnormal molecular structure of fibrinogen. Here, we describe a new case. A 32-year-old female was suspected of having dysfibrinogenemia during routine laboratory screening, based on her decreased functional fibrinogen level, normal fibrinogen antigen level, and prolonged thrombin time. We extracted DNA and performed polymerase chain reaction and DNA sequencing to identify genetic mutation. Fibrin polymerization, the kinetics of the fibrinopeptide release, scanning electron microscopy, mass spectrometric analysis, fibrin cross-linking, sodium dodecyl sulfate polyacrylamide gel electrophoresis and western blot were conducted...
December 8, 2016: International Journal of Hematology
https://www.readbyqxmd.com/read/27933490/alterations-in-the-cerebral-microvascular-proteome-expression-profile-after-transient-global-cerebral-ischemia-in-rat
#8
Stine Spray, Sara E Johansson, Alistair V G Edwards, Martin R Larsen, Aneta Radziwon-Balicka, Gro K Povlsen, Lars Edvinsson
This study aimed at obtaining an in-depth mapping of expressional changes of the cerebral microvasculature after transient global cerebral ischemia (GCI) and the impact on these GCI-induced expressional changes of post-GCI treatment with a mitogen-activated protein kinase kinase (MEK1/2) inhibitor. GCI was induced in male Wistar rats followed by treatment with either vehicle or the MEK1/2 inhibitor U0126 every 12 h post-GCI. Seventy-two hours after GCI or sham surgery, the cerebral microvasculature was isolated and the protein content analysed with state-of-the-art mass spectrometry...
December 8, 2016: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/27933369/imaging-mass-spectrometry-in-drug-development-and-toxicology
#9
REVIEW
Oskar Karlsson, Jörg Hanrieder
During the last decades, imaging mass spectrometry has gained significant relevance in biomedical research. Recent advances in imaging mass spectrometry have paved the way for in situ studies on drug development, metabolism and toxicology. In contrast to whole-body autoradiography that images the localization of radiolabeled compounds, imaging mass spectrometry provides the possibility to simultaneously determine the discrete tissue distribution of the parent compound and its metabolites. In addition, imaging mass spectrometry features high molecular specificity and allows comprehensive, multiplexed detection and localization of hundreds of proteins, peptides and lipids directly in tissues...
December 8, 2016: Archives of Toxicology
https://www.readbyqxmd.com/read/27933363/spatially-resolved-metabolic-distribution-for-unraveling-the-physiological-change-and-responses-in-tomato-fruit-using-matrix-assisted-laser-desorption-ionization-mass-spectrometry-imaging-maldi-msi
#10
Junya Nakamura, Tomomi Morikawa-Ichinose, Yoshinori Fujimura, Eisuke Hayakawa, Katsutoshi Takahashi, Takanori Ishii, Daisuke Miura, Hiroyuki Wariishi
Information on spatiotemporal metabolic behavior is indispensable for a precise understanding of physiological changes and responses, including those of ripening processes and wounding stress, in fruit, but such information is still limited. Here, we visualized the spatial distribution of metabolites within tissue sections of tomato (Solanum lycopersicum L.) fruit using a matrix-assisted laser desorption/ionization-mass spectrometry imaging (MALDI-MSI) technique combined with a matrix sublimation/recrystallization method...
December 8, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27933361/biotransformation-and-detectability-of-the-new-psychoactive-substances-n-n-diallyltryptamine-dalt-derivatives-5-fluoro-dalt-7-methyl-dalt-and-5-6-methylenedioxy-dalt-in-urine-using-gc-ms-lc-ms-n-and-lc-hr-ms-ms
#11
Julian A Michely, Simon D Brandt, Markus R Meyer, Hans H Maurer
Derivatives of N,N-diallyltryptamine (DALT) can be classified as new psychoactive substances. Biotransformation and detectability of 5-fluoro-DALT (5-F-DALT), 7-methyl-DALT (7-Me-DALT), and 5,6-methylenedioxy-DALT (5,6-MD-DALT) are described here. Their metabolites detected in rat urine and pooled human liver microsomes were identified by liquid chromatography (LC)-high resolution (HR)-tandem mass spectrometry (MS/MS). In addition, the human cytochrome-P450 (CYP) isoenzymes involved in the main metabolic steps were identified and detectability tested in urine by the authors' urine screening approaches using GC-MS, LC-MS(n), or LC-HR-MS/MS...
December 8, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27933318/global-analysis-and-comparison-of-the-transcriptomes-and-proteomes-of-group-a-streptococcus-biofilms
#12
Jeffrey A Freiberg, Yoann Le Breton, Bao Q Tran, Alison J Scott, Janette M Harro, Robert K Ernst, Young Ah Goo, Emmanuel F Mongodin, David R Goodlett, Kevin S McIver, Mark E Shirtliff
To gain a better understanding of the genes and proteins involved in group A Streptococcus (GAS; Streptococcus pyogenes) biofilm growth, we analyzed the transcriptome, cellular proteome, and cell wall proteome from biofilms at different stages and compared them to those of plankton-stage GAS. Using high-throughput RNA sequencing (RNA-seq) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) shotgun proteomics, we found distinct expression profiles in the transcriptome and proteome. A total of 46 genes and 41 proteins showed expression across the majority of biofilm time points that was consistently higher or consistently lower than that seen across the majority of planktonic time points...
November 2016: MSystems
https://www.readbyqxmd.com/read/27933189/insulin-resistance-of-protein-anabolism-accompanies-that-of-glucose-metabolism-in-lean-glucose-tolerant-offspring-of-persons-with-type-2-diabetes
#13
Sergio A Burgos, Vikram Chandurkar, Michael A Tsoukas, Stéphanie Chevalier, José A Morais, Marie Lamarche, Errol B Marliss
OBJECTIVE: To test whether protein anabolic resistance is an early defect in type 2 diabetes (T2D). RESEARCH DESIGN AND METHODS: Seven lean, normoglycemic T2D offspring (T2D-O) and eight matched participants without family history (controls; C) underwent a 3-hour hyperinsulinemic (40 mU/m(2)/min), euglycemic (5.5 mmol/L) and isoaminoacidemic clamp. Whole-body glucose and protein kinetics were measured with d-[3-(3)H]glucose and l-[l-(13)C]leucine, respectively...
2016: BMJ Open Diabetes Research & Care
https://www.readbyqxmd.com/read/27932756/-inhibitory-effect-of-jianpi-jiedu-prescription-contained-serum-on-colorectal-cancer-sw48-cell-proliferation-by-mtor-p53-p21-signalling-pathway
#14
Fengxia Lin, Sanlin Lei, Jin'an Ma, Li Shi, Dan Mao, Shaofan Zhang, Jianhua Huang, Xinyi Liu, Dengfeng Ding, Yingjin Zhang, Sifang Zhang
To investigate the effect of jianpi-jiedu (JPJD) prescription-contained serum on colorectal cancer SW48 cell proliferation and the underlying mechanisms.
 Methods: Crude extract from JPJD was made by water extract method and the main components of crude extract from JPJD were analyzed by ultra-performance liquid phase high resolution time of flight mass spectrometry (UPLC-Q-TOF/MS). The low, medium, and high-concentration of JPJD-contained serum were prepared by the serum pharmacological method. The effect of serum containing JPJD on SW48 cell proliferation was determined by MTT assay...
November 28, 2016: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
https://www.readbyqxmd.com/read/27932699/a-systematic-investigation-of-the-best-buffers-for-use-in-screening-by-maldi-mass-spectrometry
#15
Jessica Chandler, Carl Haslam, Neil Hardy, Melanie Leveridge, Peter Marshall
Matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS) offers a label-free alternative for the screening of biochemical targets in both 1536- and 6144-assay formats, as well as potentially providing increased sensitivity, reproducibility, and the simultaneous detection of multiple assay components within a specified m/z range. Ion suppression effects are one of the principal limitations reported for MS analysis. Within MALDI-MS screening, it has been identified that certain biochemical components incorporated into the assay (e...
December 8, 2016: Journal of Biomolecular Screening
https://www.readbyqxmd.com/read/27932613/type-1-reaction-in-leprosy-patients-corresponds-with-a-decrease-in-pro-resolving-and-an-increase-in-pro-inflammatory-lipid-mediators
#16
Carlos A M Silva, Kristofor Webb, Barbara G Andre, Maria Angela de Mello Marques, Fernanda Marques de Carvalho, Cristiana Santos de Macedo, Roberta Olmo Pinheiro, Euzenir Nunes Sarno, Maria Cristina Vidal Pessolani, John T Belisle
BACKGROUND: Type 1 reaction (T1R) is an acute Th1 inflammatory episode in leprosy patients. While immunological responses associated with T1R have been investigated, the corresponding metabolic responses that could contribute to T1R pathology have received little attention. METHODS: Metabolomics-based analyses of sera from T1R (n=7) and T1R-free (n=9) patients were conducted via liquid chromatography-mass spectrometry (LC-MS). Serum metabolites that significantly differed (p<0...
December 8, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27932585/structural-and-functional-characterization-of-the-tyw3-taw3-class-of-sam-dependent-methyltransferases
#17
Mark A Currie, Greg Brown, Andrew Wong, Takayuki Ohira, Kei Sugiyama, Tsutomu Suzuki, Alexander F Yakunin, Zongchao Jia
S-adenosylmethionine (SAM)-dependent methyltransferases regulate a wide range of biological processes through the modification of proteins, nucleic acids, polysaccharides, as well as various metabolites. TYW3/Taw3 is a SAM-dependent methyltransferase responsible for the formation of a tRNA modification known as wybutosine and its derivatives that are required for accurate decoding in protein synthesis. Here, we report the crystal structure of Taw3, a homolog of TYW3 from Sulfolobus solfataricus, which revealed a novel α/β fold...
December 8, 2016: RNA
https://www.readbyqxmd.com/read/27932550/spermaurin-an-la1-like-peptide-from-the-venom-of-the-scorpion-scorpio-maurus-palmatus-improves-sperm-motility-and-fertilization-in-different-mammalian-species
#18
Guillaume Martinez, Jean-Pascal Hograindleur, Sébastien Voisin, Roland Abi Nahed, Tarek M Abd El Aziz, Jessica Escoffier, Julien Bessonnat, Claire-Maëlle Fovet, Michel De Waard, Sylviane Hennebicq, Vincent Aucagne, Pierre F Ray, Eric Schmitt, Philippe Bulet, Christophe Arnoult
STUDY QUESTION: Is it possible to identify original compounds that are able to enhance sperm motility from the venom of the scorpion Scorpio maurus palmatus? SUMMARY ANSWER: We identified a potent disulfide-rich peptide (DRP) of 73 amino acids that significantly improved the motility of fresh and frozen-thawed sperm in different mammalian species, including human, and improved fertilization outcome in mouse IVF experiments. WHAT IS KNOWN ALREADY: Any disturbance of sperm motility has a strong impact on fertilization and can lead to subfertility or infertility...
December 8, 2016: Molecular Human Reproduction
https://www.readbyqxmd.com/read/27932530/affective-alterations-in-patients-with-cushing-s-syndrome-in-remission-are-associated-with-decreased-bdnf-and-cortisone-levels
#19
E Valassi, I Crespo, B G Keevil, A Aulinas, E Urgell, A Santos, P J Trainer, S M Webb
OBJECTIVE: Affective alterations and poorer quality of life often persist in patients with Cushing's syndrome (CS) in remission. Brain-derived neurotrophic factor (BDNF) regulates the hypothalamic-pituitary-adrenal axis (HPA) and is highly expressed in brain areas controlling mood and response to stress. Our aims were to assess affective alterations after long-term remission of CS and evaluate whether they are associated with serum BDNF, salivary cortisol (SalF) and/or cortisone (SalE) concentrations...
February 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/27932527/mechanisms-of-in-vivo-ribosome-maintenance-change-in-response-to-nutrient-signals
#20
Andrew D Mathis, Bradley C Naylor, Richard H Carson, Eric Evans, Justin Harwell, Jared Knect, Eric Hexem, Fredrick Peelor, Benjamin F Miller, Karyn L Hamilton, Mark K Transtrum, Benjamin T Bikman, John C Price
Control of protein homeostasis is fundamental to the health and longevity of all organisms. Because the rate of protein synthesis by ribosomes is a central control point in this process, regulation and maintenance of ribosome function could have amplified importance in the overall regulatory circuit. Indeed, ribosomal defects are commonly associated with loss of protein homeostasis, aging and disease, whereas improved protein homeostasis, implying optimal ribosomal function, is associated with disease resistance and increased lifespan...
December 8, 2016: Molecular & Cellular Proteomics: MCP
keyword
keyword
10931
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"