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https://www.readbyqxmd.com/read/29332825/development-of-gd3-immobilized-glutathione-coated-magnetic-nanoparticles-for-highly-selective-enrichment-of-phosphopeptides
#1
Dandan Jiang, Xiqian Li, Jiutong Ma, Qiong Jia
In this study, we designed a gadolinium-based immobilized metal ion affinity chromatography material for the selective enrichment of phosphopeptides. Gadolinium ion was immobilized on the surface of glutathione-coated magnetic nanoparticles through a facile and effective synthetic route. The adsorbent integrated the advantages of superparamagnetism of Fe3O4 core, good biological compatibility of glutathione, and strong interaction between gadolinium ion and phosphopeptides. It was employed to enrich phosphopeptides from standard protein digests coupled with MALDI-TOF MS...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29331241/evaluation-of-maldi-tof-mass-spectrometry-for-the-identification-of-bacteria-growing-as-biofilms
#2
A M Gaudreau, J Labrie, C Goetz, S Dufour, M Jacques
We evaluated MALDI-TOF mass spectrometry to identify bacteria from biofilms. We compared three sample preparation procedures on biofilms grown in vitro. The extended direct transfer method was able to identify 13 isolates out of 18 (72%) at the species level and 15 out of 18 (83%) at the genus level.
January 10, 2018: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/29328953/the-binding-interaction-of-imazapyr-with-cucurbit-n-uril-n-6-8-combined-experimental-and-molecular-modeling-study
#3
Maali Saad Mokhtar, FakhrEldin O Suliman, Abdalla A Elbashir
The inclusion complexes of imazapyr (IMA) with cucurbit[n]uril, CB[n] (n=6-8), have been investigated. Fluorescence spectroscopy, MALDI-TOF, and 1HNMR were used to investigate and characterize the inclusion complexation of IMA and CB[n] in solutions. Whereas the solid state complexes have been characterized by Fourier transform infrared spectroscopy (FTIR), and powder X-ray diffraction (PXRD). IMA was found to form 1:1 complexes with CB[n] with association constants ranging from 5.80×102-2.65×103. The guest molecule IMA was found to encapsulate into the larger cavities of CB[7] and CB[8], whereas with CB[6] the molecule remains outside the cavity...
January 4, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29327919/differentiation-and-relative-quantitation-of-disaccharide-iso-mers-by-maldi-tof-tof-mass-spectrometry
#4
Lingpeng Zhan, Xiaobo Xie, Yafeng Li, Huihui Liu, Caiqiao Xiong, Zongxiu Nie
Saccharide isomer differentiation has been a challenge in glycomics, as the lack of technology to decipher fully the diverse structures of compositions, linkages and anomeric configurations. Several mass spectrometry-based methods have been applied to the discrimination of disaccharide isomers, but limited quantitative analyses have been reported. In the present study, MALDI-LIFT-TOF/TOF has been investigated to differentiate and relatively quantify underivatized glucose-containing disaccharide isomers that differ in composition, connectivity or configuration...
January 12, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29327112/simultaneous-pre-concentration-and-separation-on-simple-paper-based-analytical-device-for-protein-analysis
#5
Ji-Cheng Niu, Ting Zhou, Li-Li Niu, Zhen-Sheng Xie, Fang Fang, Fu-Quan Yang, Zhi-Yong Wu
In this work, fast isoelectric focusing (IEF) was successfully implemented on an open paper fluidic channel for simultaneous concentration and separation of proteins from complex matrix. With this simple device, IEF can be finished in 10 min with a resolution of 0.03 pH units and concentration factor of 10, as estimated by color model proteins by smartphone-based colorimetric detection. Fast detection of albumin from human serum and glycated hemoglobin (HBA1c) from blood cell was demonstrated. In addition, off-line identification of the model proteins from the IEF fractions with matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) was also shown...
January 11, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29326010/genomics-of-corynebacterium-striatum-an-emerging-multi-drug-resistant-pathogen-of-immunocompromised-patients
#6
Kathleen Nudel, Xiaomin Zhao, Sankha Basu, Xiaoxi Dong, Maria Hoffmann, Michael Feldgarden, Marc Allard, Michael Klompas, Lynn Bry
OBJECTIVES: Corynebacterium striatum is an emerging multi-drug resistant (MDR) pathogen of immunocompromised and chronically ill patients. The objective of these studies was to provide a detailed genomic analysis of disease causing C. striatum and determine the genomic drivers of resistance and resistance-gene transmission. METHODS: A multi-institutional and prospective pathogen genomics program flagged seven MDR C. striatum infections occurring close in time, and specifically in immunocompromised patients with underlying respiratory diseases...
January 8, 2018: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/29325987/transfer-of-pectobacterium-carotovorum-subsp-carotovorum-strains-isolated-from-potatoes-grown-at-high-altitudes-to-pectobacterium-peruviense-sp-nov
#7
Malgorzata Waleron, Agnieszka Misztak, Michal Waleron, Martyna Franczuk, Bartosz Wielgomas, Krzysztof Waleron
Seven Gram-negative, rod-shaped pectinolytic bacteria strains designated as IFB5227, IFB5228, IFB5229, IFB5230, IFB5231, IFB5232, IFB5636, isolated from potato tubers cultivated in Peru at high altitude (2400-3800m) were subjected to polyphasic analyses that revealed their distinctiveness from the other Pectobacterium species. Phylogenetic analyses based on five housekeeping genes (gyrA, recA, recN, rpoA and rpoS) clearly showed strains separateness, simultaneously indicating Pectobacterium atrosepticum, Pectobacterium wasabiae, Pectobacterium parmentieri and Pectobacterium betavasculorum as the closest relatives...
December 21, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/29325875/fatal-thoracic-empyema-involving-campylobacter-rectus-a-case-report
#8
A Noël, A Verroken, L Belkhir, H Rodriguez-Villalobos
We report the case of a 69-year-old man admitted for septic shock secondary to necrotic pneumoniae complicated by thoracic empyema of fatal issue. Microbiological examination of pleural liquid revealed a mixed anaerobic flora involving Campylobacter rectus and Actinomyces meyeri. Campylobacter rectus is an infrequent anaerobic pathogen of oral origin To our knowledge, this is the first case report of fatal C. rectus - associated thoracic empyema, and only the second reported case in which identification was successfully performed by MALDI-TOF MS...
January 8, 2018: Anaerobe
https://www.readbyqxmd.com/read/29325326/-investigation-of-colistin-resistance-gene-mcr-in-gut-bacteria-from-patients-with-acute-diarrheal
#9
Y Li, W J Yan, S Q Liu
Objective: To investigate the presence of colistin resistance gene mcr in gut bacteria from patients with acute diarrhea. Methods: Fresh stool samples were collected from 150 outpatients with acute diarrhea in the intestinal clinic of Henan Provincial People's Hospital, and were directly detected for the presence of mcr by PCR after enrichment in the broth.The mcr-producing bacteria were further isolated and identified by MALDI-TOF MS (Bruker Biotyper). Antimicrobial susceptibility of these isolates was conducted by micro-broth dilution method...
December 19, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29318461/ceftriaxone-promotes-the-emergence-of-ampc-overproducing-enterobacteriaceae-in-gut-microbiota-from-hospitalized-patients
#10
Victoire de Lastours, Tiphaine Goulenok, François Guérin, Hervé Jacquier, Cindy Eyma, Françoise Chau, Vincent Cattoir, Bruno Fantin
Epidemiological data suggest that ceftriaxone may promote the emergence of commensal AmpC-overproducing Enterobacteriaceae because of a high biliary excretion. We tested this hypothesis in hospitalized patients either treated by ceftriaxone alone or receiving no antibiotics. Hospitalized patients with no previous antibiotics or hospitalization in the last 3 months, treated only with ceftriaxone, were prospectively included. For each ceftriaxone-treated patient, a control patient receiving no antibiotics was included...
January 10, 2018: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/29318394/genetic-association-of-hcrtr2-adh4-and-clock-genes-with-cluster-headache-a-chinese-population-based-case-control-study
#11
Zhiliang Fan, Lei Hou, Dongjun Wan, Ran Ao, Dengfa Zhao, Shengyuan Yu
BACKGROUND: Cluster headache (CH), a rare primary headache disorder, is currently thought to be a genetic susceptibility which play a role in CH susceptibility. A large numbers of genetic association studies have confirmed that the HCRTR2 (Hypocretin Receptor 2) SNP rs2653349, and the ADH4 (Alcohol Dehydrogenase 4) SNP rs1126671 and rs1800759 polymorphisms are linked to CH. In addition, the CLOCK (Circadian Locomotor Output Cycles Kaput) gene is becoming a research hotspot for CH due to encoding a transcription factor that serves as a basic driving force for circadian rhythm in humans...
January 9, 2018: Journal of Headache and Pain
https://www.readbyqxmd.com/read/29317173/identification-of-a-proteomic-biomarker-associated-with-invasive-st1-serotype-vi-group-b-streptococcus-by-maldi-tof-ms
#12
Hsiao-Chuan Lin, Jang-Jih Lu, Lee-Chung Lin, Cheng-Mao Ho, Kao-Pin Hwang, Yu-Ching Liu, Chao-Jung Chen
BACKGROUND: Group B Streptococcus (GBS) is an important invasive pathogen in neonates, pregnant women and the elderly. Serotype VI GBS, which has been rarely reported globally, has emerged as a significant pathogen in Asia. However, traditional serologic latex agglutination (LA) methods may fail to type isolates that lack of or low expression of CPS. METHODS: A total of 104 GBS strains were analyzed by MALDI-TOF MS. Multiplex PCR and multilocus sequence typing (MLST) were also performed to confirm their strains...
December 30, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/29314857/efficient-one-pot-synthesis-and-ph-dependent-tuning-of-photoluminescence-and-stability-of-au18-sc2h4co2h-14-cluster
#13
Ramakrishna Itteboina, U Divya Madhuri, Partha Ghosal, Monica Kannan, Tapan Kumar Sau, Tatsuya Tsukuda, Shweta Bhardwaj
Developing efficient ways to control the nanocluster properties and synthesize atomically-precise metal nanoclusters are the foremost goals in the field of metal nanocluster research. In this article, we demonstrate that the direct synthesis of atomically-precise, hydrophilic metal nanoclusters as well as tuning of their properties can be achieved by an appropriate selection of reactants, binding ligand, and their proportions. Thus a facile, single-step method has been developed for the direct synthesis of Au18(SC2H4CO2H)14 nanocluster in an aqueous medium under ambient conditions...
January 9, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29314679/molecular-epidemiology-of-trichophyton-quinckeanum-a-zoophilic-dermatophyte-on-the-rise
#14
Silke Uhrlaß, Wieland Schroedl, Carolin Mehlhorn, Constanze Krüger, Vit Hubka, Thomas Maier, Yvonne Gräser, Uwe Paasch, Pietro Nenoff
BACKGROUND: Formerly only referred to as a subspecies (T. mentagrophytes var. quinckeanum), T. quinckeanum once again constitutes a distinct species according to the updated taxonomy of dermatophytes. PATIENTS AND METHODS: During routine diagnostic tests conducted at the Mycology Laboratory, Mölbis, Germany, between 11/2013 to 1/2017 (three years and three months), all specimens sent in were examined for T. quinckeanum. Molecular biology methods employed included: 1) DNA hybridization (PCR ELISA), 2) gene sequencing of the ITS region and TEF-1α, and 3) in some cases, MALDI-TOF mass spectrometry...
January 2018: Journal der Deutschen Dermatologischen Gesellschaft, Journal of the German Society of Dermatology: JDDG
https://www.readbyqxmd.com/read/29310582/identification-of-uncommon-oral-yeasts-from-cancer-patients-by-maldi-tof-mass-spectrometry
#15
Narges Aslani, Ghasem Janbabaei, Mahdi Abastabar, Jacques F Meis, Mahasti Babaeian, Sadegh Khodavaisy, Teun Boekhout, Hamid Badali
BACKGROUND: Opportunistic infections due to Candida species occur frequently in cancer patients because of their inherent immunosuppression. The aim of the present study was to investigate the epidemiology of yeast species from the oral cavity of patients during treatment for oncological and haematological malignancies. METHODS: MALDI-TOF was performed to identify yeasts isolated from the oral cavity of 350 cancer patients. Moreover, antifungal susceptibility testing was performed in according to CLSI guidelines (M27-A3)...
January 8, 2018: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29310278/fast-screening-of-short-chain-chlorinated-paraffins-in-indoor-dust-samples-by-graphene-assisted-laser-desorption-ionization-mass-spectrometry
#16
Xiu Huang, Qian Liu, Wei Gao, Yawei Wang, Zhou Nie, Shouzhuo Yao, Guibin Jiang
As an important class of emerging chemical contaminants, short-chain chlorinated paraffins (SCCPs) are considered as one of the most challenging groups of compounds to analyze. In this paper, we report a new method for fast screening of SCCPs based on matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) with graphene as a matrix and 2,5,6,9-tetrachlorodecane as an internal standard. We found that the use of graphene as MALDI matrix generated high peak intensities for SCCPs while producing few background noises...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29307737/detection-of-carbapenemase-activity-in-pseudomonas-aeruginosa-by-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-maldi-tof-ms
#17
G Miltgen, P Plésiat, A Mille, P Chatelain, D Fournier
A new MALDI-TOF MS imipenem hydrolysis assay was developed to optimize detection of carbapenemase-producing strains of Pseudomonas aeruginosa. The method correctly discriminated carbapenemase producers (n=74) from non-producers (n=95) in 99.4% of cases, and successfully detected 100% GES-5 strains (n=5).
January 4, 2018: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/29305797/anatomical-molecular-distribution-of-ephrina1-in-infarcted-mouse-heart-using-maldi-mass-spectrometry-imaging
#18
Stephan Lefcoski, Kimberly Kew, Shaun Reece, Maria J Torres, Justin Parks, Sky Reece, Lisandra E de Castro Brás, Jitka A I Virag
EphrinA1 is a tyrosine kinase receptor localized in the cellular membrane of healthy cardiomyocytes, the expression of which is lost upon myocardial infarction (MI). Intra-cardiac injection of the recombinant form of ephrinA1 (ephrinA1-Fc) at the time of ligation in mice has shown beneficial effects by reducing infarct size and myocardial necrosis post-MI. To date, immunohistochemistry and Western blotting comprise the only experimental approaches utilized to localize and quantify relative changes of ephrinA1 in sections and homogenates of whole left ventricle, respectively...
January 5, 2018: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/29304738/chemical-hybridizing-agent-sq-1-induced-male-sterility-in-triticum-aestivum-l-a-comparative-analysis-of-the-anther-proteome
#19
Hongzhan Liu, Gaisheng Zhang, Junsheng Wang, Jingjing Li, Yulong Song, Lin Qiao, Na Niu, Junwei Wang, Shoucai Ma, Lili Li
BACKGROUND: Heterosis is widely used to increase the yield of many crops. However, as wheat is a self-pollinating crop, hybrid breeding is not so successful in this organism. Even though male sterility induced by chemical hybridizing agents is an important aspect of crossbreeding, the mechanisms by which these agents induce male sterility in wheat is not well understood. RESULTS: We performed proteomic analyses using the wheat Triticum aestivum L.to identify those proteins involved in physiological male sterility (PHYMS) induced by the chemical hybridizing agent CHA SQ-1...
January 5, 2018: BMC Plant Biology
https://www.readbyqxmd.com/read/29302817/characterization-of-a-long-chain-%C3%AE-galactosidase-from-papiliotrema-flavescens
#20
Barbora Stratilová, Jaroslav Klaudiny, Pavel Řehulka, Eva Stratilová, Csilla Mészárosová, Soňa Garajová, Barbora Pavlatovská, Helena Řehulková, Stanislav Kozmon, Sergej Šesták, Zuzana Firáková, Renáta Vadkertiová
α-Galactosidases are assigned to the class of hydrolases and the subclass of glycoside hydrolases (GHs). They belong to six GH families and include the only characterized α-galactosidases from yeasts (GH 27, Saccharomyces cerevisiae). The present study focuses on an investigation of the lactose-inducible α-galactosidase produced by Papiliotrema flavescens. The enzyme was present on the surface of cells and in the cytosol. Its temperature optimum was about 60 °C and the pH optimum was 4.8; the pH stability ranged from 3...
January 4, 2018: World Journal of Microbiology & Biotechnology
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