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Rachaneeporn Tiyawisutsri Matthew TG Holden Sarinna Tumapa Sirirat Rengpipat Simon R Clarke Simon J Foster William C Nierman Nicholas PJ Day Sharon J Peacock 《BMC microbiology》2007,7(1):19
Background
The bacterial biothreat agents Burkholderia mallei and Burkholderia pseudomallei are the cause of glanders and melioidosis, respectively. Genomic and epidemiological studies have shown that B. mallei is a recently emerged, host restricted clone of B. pseudomallei. 相似文献2.
Stefan TG Bruijnen Mignon AC van der Weijden Joannes P Klein Otto S Hoekstra Ronald Boellaard J Christiaan van Denderen Ben AC Dijkmans Alexandre E Voskuyl Irene E van der Horst-Bruinsma Conny J van der Laken 《Arthritis research & therapy》2012,14(2):R71
Introduction
Positron Emission Tomography - Computer Tomography (PET-CT) is an interesting imaging technique to visualize Ankylosing Spondylitis (AS) activity using specific PET tracers. Previous studies have shown that the PET tracers [18F]FDG and [11C](R)PK11195 can target inflammation (synovitis) in rheumatoid arthritis (RA) and may therefore be useful in AS. Another interesting tracer for AS is [18F]Fluoride, which targets bone formation. In a pilot setting, the potential of PET-CT in imaging AS activity was tested using different tracers, with Magnetic Resonance Imaging (MRI) and conventional radiographs as reference.Methods
In a stepwise approach different PET tracers were investigated. First, whole body [18F]FDG and [11C](R)PK11195 PET-CT scans were obtained of ten AS patients fulfilling the modified New York criteria. According to the BASDAI five of these patients had low and five had high disease activity. Secondly, an extra PET-CT scan using [18F]Fluoride was made of two additional AS patients with high disease activity. MRI scans of the total spine and sacroiliac joints were performed, and conventional radiographs of the total spine and sacroiliac joints were available for all patients. Scans and radiographs were visually scored by two observers blinded for clinical data.Results
No increased [18F]FDG and [11C](R)PK11195 uptake was noticed on PET-CT scans of the first 10 patients. In contrast, MRI demonstrated a total of five bone edema lesions in three out of 10 patients. In the two additional AS patients scanned with [18F]Fluoride PET-CT, [18F]Fluoride depicted 17 regions with increased uptake in both vertebral column and sacroiliac joints. In contrast, [18F]FDG depicted only three lesions, with an uptake of five times lower compared to [18F]Fluoride, and again no [11C](R)PK11195 positive lesions were found. In these two patients, MRI detected nine lesions and six out of nine matched with the anatomical position of [18F]Fluoride uptake. Conventional radiographs showed structural bony changes in 11 out of 17 [18F]Fluoride PET positive lesions.Conclusions
Our PET-CT data suggest that AS activity is reflected by bone activity (formation) rather than inflammation. The results also show the potential value of PET-CT for imaging AS activity using the bone tracer [18F]Fluoride. In contrast to active RA, inflammation tracers [18F]FDG and [11C](R)PK11195 appeared to be less useful for AS imaging. 相似文献3.
The spider tree of life: phylogeny of Araneae based on target‐gene analyses from an extensive taxon sampling 下载免费PDF全文
Ward C. Wheeler Jonathan A. Coddington Louise M. Crowley Dimitar Dimitrov Pablo A. Goloboff Charles E. Griswold Gustavo Hormiga Lorenzo Prendini Martín J. Ramírez Petra Sierwald Lina Almeida‐Silva Fernando Alvarez‐Padilla Miquel A. Arnedo Ligia R. Benavides Silva Suresh P. Benjamin Jason E. Bond Cristian J. Grismado Emile Hasan Marshal Hedin Matías A. Izquierdo Facundo M. Labarque Joel Ledford Lara Lopardo Wayne P. Maddison Jeremy A. Miller Luis N. Piacentini Norman I. Platnick Daniele Polotow Diana Silva‐Dávila Nikolaj Scharff Tamás Szűts Darrell Ubick Cor J. Vink Hannah M. Wood Junxia Zhang 《Cladistics : the international journal of the Willi Hennig Society》2017,33(6):574-616
4.
Rosemari Otton Douglas Popp Marin Anaysa Paola Bolin Rita de Cássia Macedo dos Santos Tatiana Geraldo Polotow Sandra Coccuzzo Sampaio Marcelo Paes de Barros 《Chemico-biological interactions》2010,186(3):306-315
Diabetes mellitus is a syndrome of impaired insulin secretion/sensitivity and frequently diagnosed by hyperglycemia, lipid abnormalities, and vascular complications. The diabetic ‘glucolipotoxicity’ also induces immunodepression in patients by redox impairment of immune cells. Astaxanthin (ASTA) is a pinkish-orange carotenoid found in many marine foods (e.g. shrimp, crabs, salmon), which has powerful antioxidant, photoprotective, antitumor, and cardioprotective properties. Aiming for an antioxidant therapy against diabetic immunodepression, we here tested the ability of prophylactic ASTA supplementation (30 days, 20 mg ASTA/kg BW) to oppose the redox impairment observed in isolated lymphocytes from alloxan-induced diabetic Wistar rats. The redox status of lymphocytes were thoroughly screened by measuring: (i) production of superoxide (O2?), nitric oxide (NO), and hydrogen peroxide (H2O2); (ii) cytosolic Ca2+; (iii) indexes of oxidative injury; and (iv) activities of major antioxidant enzymes. Hypolipidemic and antioxidant effects of ASTA in plasma of ASTA-fed/diabetic rats were apparently reflected in the circulating lymphocytes, since lower activities of catalase, restored ratio between glutathione peroxidase and glutathione reductase activities and lower scores of lipid oxidation were concomitantly measured in those immune cells. Noteworthy, lower production of NO and O2? (precursors of peroxynitrite), and lower cytosolic Ca2+ indicate a hypothetical antiapoptotic effect of ASTA in diabetic lymphocytes. However, questions are still open regarding the proper ASTA supplementation dose needed to balance efficient antioxidant protection and essential NO/H2O2-mediated proliferative capacities of diabetic lymphocytes. 相似文献
5.
Li-Yang Hsu Simon R Harris Monika A Chlebowicz Jodi A Lindsay Tse-Hsien Koh Prabha Krishnan Thean-Yen Tan Pei-Yun Hon Warren B Grubb Stephen D Bentley Julian Parkhill Sharon J Peacock Matthew TG Holden 《Genome biology》2015,16(1)
BackgroundIn the past decade, several countries have seen gradual replacement of endemic multi-resistant healthcare-associated methicillin-resistant Staphylococcus aureus (MRSA) with clones that are more susceptible to antibiotic treatment. One example is Singapore, where MRSA ST239, the dominant clone since molecular profiling of MRSA began in the mid-1980s, has been replaced by ST22 isolates belonging to EMRSA-15, a recently emerged pandemic lineage originating from Europe.ResultsWe investigated the population structure of MRSA in Singaporean hospitals spanning three decades, using whole genome sequencing. Applying Bayesian phylogenetic methods we report that prior to the introduction of ST22, the ST239 MRSA population in Singapore originated from multiple introductions from the surrounding region; it was frequently transferred within the healthcare system resulting in a heterogeneous hospital population. Following the introduction of ST22 around the beginning of the millennium, this clone spread rapidly through Singaporean hospitals, supplanting the endemic ST239 population. Coalescent analysis revealed that although the genetic diversity of ST239 initially decreased as ST22 became more dominant, from 2007 onwards the genetic diversity of ST239 began to increase once more, which was not associated with the emergence of a sub-clone of ST239. Comparative genomic analysis of the accessory genome of the extant ST239 population identified that the Arginine Catabolic Mobile Element arose multiple times, thereby introducing genes associated with enhanced skin colonization into this population.ConclusionsOur results clearly demonstrate that, alongside clinical practice and antibiotic usage, competition between clones also has an important role in driving the evolution of nosocomial pathogen populations.
Electronic supplementary material
The online version of this article (doi:10.1186/s13059-015-0643-z) contains supplementary material, which is available to authorized users. 相似文献6.
Eike J Steinig Patiyan Andersson Simon R Harris Derek S Sarovich Anand Manoharan Paul Coupland Matthew TG Holden Julian Parkhill Stephen D Bentley D Ashley Robinson Steven YC Tong 《BMC genomics》2015,16(1)
Background
Methicillin-resistant Staphylococcus aureus (MRSA) is a major cause of hospital-associated infection, but there is growing awareness of the emergence of multidrug-resistant lineages in community settings around the world. One such lineage is ST772-MRSA-V, which has disseminated globally and is increasingly prevalent in India. Here, we present the complete genome sequence of DAR4145, a strain of the ST772-MRSA-V lineage from India, and investigate its genomic characteristics in regards to antibiotic resistance and virulence factors.Results
Sequencing using single-molecule real-time technology resulted in the assembly of a single continuous chromosomal sequence, which was error-corrected, annotated and compared to nine draft genome assemblies of ST772-MRSA-V from Australia, Malaysia and India. We discovered numerous and redundant resistance genes associated with mobile genetic elements (MGEs) and known core genome mutations that explain the highly antibiotic resistant phenotype of DAR4145. Staphylococcal toxins and superantigens, including the leukotoxin Panton-Valentinin Leukocidin, were predominantly associated with genomic islands and the phage φ-IND772PVL. Some of these mobile resistance and virulence factors were variably present in other strains of the ST772-MRSA-V lineage.Conclusions
The genomic characteristics presented here emphasize the contribution of MGEs to the emergence of multidrug-resistant and highly virulent strains of community-associated MRSA. Antibiotic resistance was further augmented by chromosomal mutations and redundancy of resistance genes. The complete genome of DAR4145 provides a valuable resource for future investigations into the global dissemination and phylogeography of ST772-MRSA-V.Electronic supplementary material
The online version of this article (doi:10.1186/s12864-015-1599-9) contains supplementary material, which is available to authorized users. 相似文献7.
Victoria Küttner Claudia Mack Kristoffer TG Rigbolt Johannes S Kern Oliver Schilling Hauke Busch Leena Bruckner‐Tuderman Jörn Dengjel 《Molecular systems biology》2013,9(1)
The mammalian cellular microenvironment is shaped by soluble factors and structural components, the extracellular matrix, providing physical support, regulating adhesion and signalling. A global, quantitative mass spectrometry strategy, combined with bioinformatics data processing, was developed to assess proteome differences in the microenvironment of primary human fibroblasts. We studied secreted proteins of fibroblasts from normal and pathologically altered skin and their post‐translational modifications. The influence of collagen VII, an important structural component, which is lost in genetic skin fragility, was used as model. Loss of collagen VII had a global impact on the cellular microenvironment and was associated with proteome alterations highly relevant for disease pathogenesis including decrease in basement membrane components, increase in dermal matrix proteins, TGF‐β and metalloproteases, but not higher protease activity. The definition of the proteome of fibroblast microenvironment and its plasticity in health and disease identified novel disease mechanisms and potential targets of intervention. 相似文献
8.
A cladistic analysis based on parsimony was performed to test the monophyly of Cteninae. The data matrix comprises 72 terminal taxa scored for 88 characters from external morphology, female internal genitalia, and two behavioural characters. Cteninae, as currently delimited, is polyphyletic. The monoplyly of Cteninae requires the transfer of two Ctenus species to Enoploctenus (Acantheinae) and two Ctenus species to Asthenoctenus (Viridasiinae). Ctenus, the genus type, comprises approximately half of the described species of the family, and is polyphyletic as currently delimited. From the 32 Ctenus species added to this analysis, only 13 are recognized as Ctenus s.s.: (C. rectipes (C. pauloterrai (C. manauara, C. nigritus ((C. dubius, C. crulsi) ((C. amphora, C. minor) (C. medius, C. paubrasil (C. fernandae (C. ornatus, C. vehemens)))))))). The results suggest that at least eight new genera should be described to accommodate species misplaced in Ctenus. The result also refutes the monophyly of Amauropelma Raven, Stumkat & Gray, 2001, Celaetycheus Simon, 1897, Leptoctenus L. Koch, 1878, and Thoriosa Simon, 1910. The following taxonomic changes are proposed: Ctenus inazensis Strand, 1909 and Ctenus miserabilis Strand, 1916 are transferred to Enoploctenus; Ctenus tarsalis F.O. Pickard‐Cambridge, 1902 and Ctenus bulimus Strand, 1909 are transferred to Asthenoctenus Simon, 1897; Celaetycheus modestus Bryant, 1942 is transferred to Ohvida Polotow & Brescovit, 2009. © 2014 The Linnean Society of London 相似文献
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