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Maldi-tof identification

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https://www.readbyqxmd.com/read/28646681/proteomic-analysis-of-developing-wheat-grains-infected-by-powdery-mildew-blumeria-graminis-f-sp-tritici
#1
Jie Li, Xi-Wen Yang, Yong-Chun Li, Ji-Shan Niu, De-Xian He
Blumeria graminis f.sp. tritici (Bgt) infection greatly interferes with the normal source-sink relationships and always causes tremendous loss of yield and quality in wheat. To better understand the impact of this pathogen on grain development, proteome characterization during grain development in susceptible wheat cultivar Xinong 979 infected by powdery mildew was investigated by 2-DE and tandem MALDI-TOF/TOF-MS. Identification of 111 differentially expressed protein spots representing 85 unique proteins and six expression patterns showed a chronological description of wheat grain formation...
June 10, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28643898/identification-of-cross-reactive-b-cell-epitopes-between-bos-d-9-0101-bos-taurus-and-gly-m-5-0101-glycine-max-by-epitope-mapping-maldi-tof-ms
#2
Ángela María Candreva, Mario Ferrer-Navarro, Silvia Bronsoms, Alejandra Quiroga, Renata Curciarello, Ana Cauerhff, Silvana Petruccelli, Guillermo Horacio Docena, Sebastián Alejandro Trejo
Exposure to cow's milk constitutes one of the most common causes of food allergy. In addition, exposure to soy proteins has become relevant in a restricted proportion of milk allergic pediatric patients treated with soy formulae as a dairy substitute, because of the cross-allergenicity described between soy and milk proteins . We have previously identified several cross-reactive allergens between milk and soy that may explain this intolerance. The purpose of the present work was to identify epitopes in the purified αS1-casein and the recombinant soy allergen Gly m 5...
June 23, 2017: Proteomics
https://www.readbyqxmd.com/read/28643493/identification-of-viridans-streptococci-with-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-by-an-in-house-method-and-a-commercially-available-system
#3
Catalina Suzana Stingu, Klaus Eschrich, Juliane Thiel, Toralf Borgmann, Reiner Schaumann, Arne C Rodloff
Two matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS)-based methods were compared for their ability to identify viridans streptococci. One approach employed a reference database and software developed in-house. All inhouse measurements were performed using an Autoflex II Instrument (Bruker Daltonics GmbH, Germany). The other system, a VITEK-MS (BioMérieux, France) was operated on the commercially available V2.0 Knowledge Base for Clinical Use database. Clinical isolates of viridans streptococci (n=184) were examined...
September 2017: Annals of Laboratory Medicine
https://www.readbyqxmd.com/read/28637912/parallel-evaluation-of-the-maldi-sepsityper-and-verigene-bc-gn-assays-for-rapid-identification-of-gram-negative-bacilli-from-positive-blood-cultures
#4
Miguel A Arroyo, Gerald A Denys
Rapid identification of microorganisms from positive blood cultures has improved clinical management and antimicrobial stewardship. The advent of the matrix-assisted laser desorption time-of-flight Mass Spectrometry (MALDI-TOF MS) has reduced the time to identification of cultured isolates and is now often the definitive method used in the clinical microbiology laboratory. The commercial in vitro diagnostic MALDI Sepsityper (Sepsityper) kit has the potential for standardization and clinical routine use for the rapid identification of a broad range of bacteria from positive blood cultures...
June 21, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28637909/rapid-differentiation-of-haemophilus-influenzae-and-haemophilus-haemolyticus-using-maldi-tof-mass-spectrometry-with-clinprotools-mass-spectra-analysis
#5
Jonathan H K Chen, Vincent C C Cheng, Chun-Pong Wong, Sally C Y Wong, Wing-Cheong Yam, Kwok-Yung Yuen
Haemophilus influenzae is associated with severe invasive disease, while Haemophilus haemolyticus is considered part of the commensal flora in the human respiratory tract. Although the addition of a custom mass spectra library into the matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS) system could improve identification of these two species, the establishment of such a custom database is technically complicated and requires a large amount of resources, which most clinical laboratories cannot afford...
June 21, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28637907/online-identification-of-fungi-using-maldi-tof-mass-spectrometry-validation-of-a-new-web-application
#6
A C Normand, P Becker, F Gabriel, C Cassagne, I Accoceberry, M Gari-Toussaint, L Hasseine, D De Geyter, D Pierard, I Surmont, F Djenad, J L Donnadieu, M Piarroux, S Ranque, M Hendrickx, R Piarroux
MALDI-TOF mass spectrometry has emerged as a reliable technique to identify molds involved in human diseases, including dermatophytes, provided that exhaustive reference databases are available. This study assessed an online identification application based on original algorithms and an extensive in-house reference database comprising 11,851 spectra (938 fungal species and 246 fungal genera).Validation criteria were established using an initial panel of 422 molds, including dermatophytes, previously identified via DNA sequencing (126 species)...
June 21, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28634118/identification-of-chickpea-seed-proteins-resistant-to-simulated-in-vitro-human-digestion
#7
I C Ribeiro, C C Leclercq, N Simões, A Toureiro, I Duarte, J B Freire, M M Chaves, J Renaut, C Pinheiro
Proteins and peptides able to resist gastrointestinal digestion and reach the intestinal mucosa have the potential to influence human health. Chickpea (Cicer arietinum L.) seed proteins are able to resist cooking (86.9% total protein) and/or in vitro simulated human digestion (15.9% total protein resists soaking, cooking and digestion with pepsin and pancreatin). To identify and characterize proteins resisting digestion we made use of different MS methodologies. The efficiency of several proteases (trypsin, AspN, chymotrypsin and LysC) was tested, and two technologies were employed (MALDI-TOF-TOF and LC-nESI-MS/MS)...
June 17, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28630686/fecal-carriage-of-extended-spectrum-%C3%AE-lactamase-and-carbapenemase-producing-enterobacteriaceae-in-egyptian-patients-with-community-onset-gastrointestinal-complaints-a-hospital-based-cross-sectional-study
#8
H M Abdallah, N Alnaiemi, E A Reuland, B B Wintermans, A Koek, A M Abdelwahab, A Samy, K W Abdelsalam, C M J E Vandenbroucke-Grauls
OBJECTIVES: The aim of this study was to determine the prevalence of extended-spectrum β-lactamase (ESBL) and carbapenemase production among Enterobacteriaceae isolated from ambulatory patients with gastrointestinal complaints admitted to El-Ahrar General Hospital, Zagazig, Egypt in the period between January 2013 and May 2013. METHODS: One hundred and thirteen Enterobacteriaceae isolates were recovered from 100 consecutive Egyptian patients with community-onset gastrointestinal complaints...
2017: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28630187/cumulative-effect-of-an-antimicrobial-stewardship-and-rapid-diagnostic-testing-bundle-on-early-streamlining-of-antimicrobial-therapy-in-gram-negative-bloodstream-infections
#9
P B Bookstaver, E B Nimmich, T J Smith, J A Justo, J Kohn, K L Hammer, C Troficanto, H A Albrecht, M N Al-Hasan
OBJECTIVES: The use of rapid diagnostic tests (RDT) enhances antimicrobial stewardship programs (ASP) interventions in optimization of antimicrobial therapy. This quasi-experimental cohort study evaluates the combined impact of an ASP/RDT bundle on appropriateness of empirical antimicrobial therapy (EAT) and time to de-escalation of broad-spectrum agents (BSAA) in gram-negative bloodstream infections (GNBSI). METHODS: ASP/RDT bundle consisted of a system-wide GNBSI treatment guidelines, prospective stewardship monitoring, and sequential introduction of two RDTs, Matrix Assisted Laser Desorption Ionization Time-of-Flight (MALDI-TOF) and FilmArray® Blood Culture Identification (BCID) panel...
June 19, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28628752/high-prevalence-of-resistance-to-fluoroquinolones-and-tetracycline-campylobacter-spp-isolated-from-poultry-in-poland
#10
Anna Woźniak-Biel, Gabriela Bugla-Płoskońska, Alicja Kielsznia, Kamila Korzekwa, Anna Tobiasz, Agnieszka Korzeniowska-Kowal, Alina Wieliczko
Campylobacter spp. is a major cause of foodborne diseases in humans, particularly when transmitted by the handling or consumption of undercooked poultry meat. Most Campylobacter infections are self-limiting, but antimicrobial treatment (e.g., fluoroquinolones and macrolides) is necessary in severe or prolonged cases. The indiscriminate use of these drugs, both in clinical medicine and animal production, has a major impact on public health. The aim of the present study was to identify Campylobacter strains, isolated from turkey and broilers, using both PCR and the matrix-assisted laser desorption-ionization time-of-flight (MALDI-TOF) methods to reveal the accuracy of identification, as well to evaluate the antimicrobial and genetic resistance of the investigated strains...
June 19, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28626737/high-level-bacterial-contamination-of-secondary-school-students-mobile-phones
#11
Siiri Kõljalg, Rando Mändar, Tiina Sõber, Tiiu Rööp, Reet Mändar
INTRODUCTION: While contamination of mobile phones in the hospital has been found to be common in several studies, little information about bacterial abundance on phones used in the community is available. Our aim was to quantitatively determine the bacterial contamination of secondary school students' mobile phones. METHODS: Altogether 27 mobile phones were studied. The contact plate method and microbial identification using MALDI-TOF mass spectrometer were used for culture studies...
June 2017: Germs
https://www.readbyqxmd.com/read/28623484/identification-of-mycobacterium-species-by-maldi-tof-mass-spectrometry
#12
M Neuschlova, M Vladarova, J Kompanikova, V Sadlonova, E Novakova
Matrix-assisted laser desorption ionization - time-of-flight (MALDI-TOF) mass spectrometry enables to identify microorganisms by comparison of the protein content with reference spectra in the database. The aim of this study was to evaluate the efficacy of phenotypic identification of mycobacteria by MALDI-TOF mass spectrometry in laboratory practice. Seventy five isolates of mycobacteria were identified by molecular and phenotypic method, and the results were compared by MALDI-TOF. For MALDI-TOF, material was processed according to the Bruker Daltonics protocol and Mycobacterial Library database version 2...
June 17, 2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28619149/abortion-and-mortality-in-farm-mink-neovison-vison-associated-with-feed-born-clostridium-limosum
#13
Anne Sofie Hammer, Lars Andresen, Bent Aalbæk, Peter Damborg, Vilhelm Weiss, Mette Line Christiansen, Søren Selsing, Martin Iain Bahl
Disease in mink clinically characterized by abortion and increased mortality among pregnant female mink on 28 Danish farms was observed during April and May 2015. Most of these farms suffered extensive disease problems, including a significant increase in the number of mated females without litters. Pathological, microbiological and molecular biological methods were applied to investigate the cause of disease. Necropsies of animals found dead revealed fragile and partially dissolved (liquefying) uterine tissue, with the presence of Gram positive rod-shaped bacteria...
May 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28612431/phlorotannin-composition-of-laminaria-digitata
#14
Anne M Vissers, Augusta Caligiani, Stefano Sforza, Jean-Paul Vincken, Harry Gruppen
INTRODUCTION: Phlorotannins are complex mixtures of phloroglucinol oligomers connected via C-C (fucols) or C-O-C (phlorethols) linkages. Their uniformity in subunits and large molecular weight hamper their structural analysis. Despite its commercial relevance for alginate extraction, phlorotannins in Laminaria digitata have not been studied. OBJECTIVE: To obtain quantitative and structural information on phlorotannins in a methanolic extract from L. digitata. METHODOLOGY: The combined use of (13) C and (1) H NMR spectroscopy allowed characterisation of linkage types and extract purity...
June 13, 2017: Phytochemical Analysis: PCA
https://www.readbyqxmd.com/read/28609453/evaluation-of-a-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-assisted-selective-broth-method-to-screen-for-vancomycin-resistant-enterococci-in-patients-at-high-risk
#15
Tsi-Shu Huang, Susan Shin-Jung Lee, Chia-Chien Lee, Chiu-Yen Chen, Fang-Chen Chen, Bao-Chen Chen, Cheng Len Sy, Kuan-Sheng Wu
BACKGROUND: Bile esculin azide with vancomycin (BEAV) medium is a sensitive, but slightly less specific method for vancomycin-resistant enterococci (VRE) screening. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) is a rapid method for identification of clinical pathogens. This study aimed to assess the performance of a novel combination screening test for VRE, using BEAV broth combined with MALDI-TOF MS. MATERIALS AND METHODS: Clinical specimens were collected from patients at risk of VRE carriage, and tested by the novel combination method, using selective BEAV broth culture method followed by MALDI-TOF MS identification (SBEAVM)...
2017: PloS One
https://www.readbyqxmd.com/read/28608568/the-macrophage-activation-induced-by-bacillus-thuringiensis-cry1ac-protoxin-involves-erk1-2-and-p38-pathways-and-the-interaction-with-cell-surface-hsp70
#16
Néstor Rubio-Infante, Damaris Ilhuicatzi-Alvarado, Marilu Torres-Martínez, Juan Pablo Reyes-Grajeda, Raúl Nava-Acosta, Edith González-González, Leticia Moreno-Fierros
Here, we aimed to further characterize the mechanisms involved in protoxin (p) Cry1Ac-induced macrophage activation. We demonstrated that pCry1Ac induces MAPK ERK1/2, p38 and JNK phosphorylation in RAW264.7 macrophages. Because MAPK activation is mainly triggered via ligand-receptor interactions, we focused on the identification of potential pCry1Ac-receptor proteins. Flow cytometry and confocal analysis showed specific saturable pCry1Ac-binding to the macrophage surface and evidenced its internalization via the clathrin-pathway...
June 13, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28608323/comparison-of-two-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-systems-for-the-identification-of-clinical-filamentous-fungi
#17
Yanfei Huang, Mingxin Zhang, Min Zhu, Mei Wang, Yufeng Sun, Haitong Gu, Jingjing Cao, Xue Li, Shaoya Zhang, Jinglin Wang, Xinxin Lu
Infections caused by filamentous fungi have become a health concern, and require rapid and accurate identification in order for effective treatment of the pathogens. To compare the performance of two MALDI-TOF MS systems (Bruker Microflex LT and Xiamen Microtyper) in the identification of filamentous fungal species. A total of 374 clinical filamentous fungal isolates sequentially collected in the Clinical Laboratory at the Beijing Tongren Hospital between January 2014 and December 2015 were identified by traditional phenotypic methods, Bruker Microflex LT and Xiamen Microtyper MALDI-TOF MS, respectively...
July 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28605028/a-robust-protocol-for-the-isolation-of-cellular-proteins-from-xanthomonas-campestris-in-2d-gel-experiments
#18
Fabian Schulte, Markus Hardt, Karsten Niehaus
Two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) is a key technique for the separation of complex protein samples to survey the protein inventory of prokaryotic micro-organisms. Although the preparation of proteins is a critical step in 2D-gel experiments, its effect on the outcome of proteome data is often underestimated. In this work, we show that the choice of protein isolation method can have a profound impact on the quality of 2D-gels of protein extracts from prokaryotes. Based on Xanthomonas campestris, a commercially relevant producer of the thickening agent xanthan, we validated a phenol extraction protocol for the purification of bacterial proteins that provides excellent 2D-gel separation...
June 12, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28602552/intensity-fading-maldi-tof-mass-spectrometry-and-functional-proteomics-assignments-to-identify-protease-inhibitors-in-marine-invertebrates
#19
Giovanni Covaleda, Sebastian A Trejo, Emir Salas-Sarduy, Maday Alonso Del Rivero, Maria Angeles Chavez, Francesc X Aviles
Proteases and their inhibitors have become molecules of increasing fundamental and applicative value. Here we report an integrated strategy to identify and analyze such inhibitors from Caribbean marine invertebrates extracts by a fast and sensitive functional proteomics-like approach. The strategy works in three steps: i) multiplexed enzymatic inhibition kinetic assays, ii) Intensity Fading MALDI-TOF MS to establish a link between inhibitory molecules and the related MALDI signal(s) detected in the extract(s), and iii) ISD-CID-T(3) MS fragmentation on the parent MALDI signals selected in the previous step, enabling the partial or total top-down sequencing of the molecules...
June 6, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28600869/follow-up-on-the-characterization-of-peptidic-markers-in-hair-and-fur-for-the-identification-of-common-north-american-species
#20
Caroline Solazzo
RATIONALE: Species identification of hair is routinely done by microscopic analysis. Following previous studies that used protein analysis to characterize species markers in hair and wool, the present work aims at covering a larger number of species and to ultimately offer a method for rapid hair identification in forensics and archaeology. METHODS: Hair is mostly made of alpha-keratins; these proteins have only been sequenced in a handful of species and most animal families are under-represented...
June 10, 2017: Rapid Communications in Mass Spectrometry: RCM
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