36,753 research outputs found
An Ontology-Based Method for Semantic Integration of Business Components
Building new business information systems from reusable components is today
an approach widely adopted and used. Using this approach in analysis and design
phases presents a great interest and requires the use of a particular class of
components called Business Components (BC). Business Components are today
developed by several manufacturers and are available in many repositories.
However, reusing and integrating them in a new Information System requires
detection and resolution of semantic conflicts. Moreover, most of integration
and semantic conflict resolution systems rely on ontology alignment methods
based on domain ontology. This work is positioned at the intersection of two
research areas: Integration of reusable Business Components and alignment of
ontologies for semantic conflict resolution. Our contribution concerns both the
proposal of a BC integration solution based on ontologies alignment and a
method for enriching the domain ontology used as a support for alignment.Comment: IEEE New Technologies of Distributed Systems (NOTERE), 2011 11th
Annual International Conference; ISSN: 2162-1896 Print ISBN:
978-1-4577-0729-2 INSPEC Accession Number: 12122775 201
Foodborne Staphylococcus Aureus: Identification and Enterotoxin Production in Milk and Cheese.
OnemocnÄnĂ z potravin (alimentĂĄrnĂ onemocnÄnĂ) vyvolanĂĄ bakteriemi jsou stĂĄle aktuĂĄlnĂm tĂ©matem v celosvÄtovĂ©m mÄĆĂtku. Abychom zajistili vĂœrobu zdravotnÄ nezĂĄvadnĂœch potravin, je potĆeba novĂœch poznatkĆŻ o virulenci patogenĆŻ, kterĂ© by doplnily jiĆŸ znĂĄmĂ© skuteÄnosti o jejich rĆŻstu a pĆeĆŸivĂĄnĂ v potravinĂĄch. TakĂ© potĆebujeme vyvĂjet rychlĂ© a citlivĂ© metody na detekci tÄchto patogenĆŻ. DizertaÄnĂ prĂĄce popisuje metodu na detekci S. aureus v potravinĂĄch, kterĂĄ je zaloĆŸenĂĄ na PCR v reĂĄlnĂ©m Äase ve spojenĂ s namnoĆŸenĂm v selektivnĂm mĂ©dium. DĂĄle pojednĂĄvĂĄ o vlivu environmentĂĄlnĂch faktorĆŻ na rĆŻst S. aureus a tvorbu enterotoxinĆŻ v mlĂ©ce a sĂœrech. Vyvinuli jsme rychlou a citlivou metodu na detekci S. aureus v potravinĂĄch s pouĆŸitĂm selektivnĂho namnoĆŸenĂ a PCR v reĂĄlnĂ©m Äase. NovÄ vyvinutĂĄ metoda umoĆŸnila detekci S. aureus na druhĂœ den od pĆijetĂ vzorku. Tato metoda mĆŻĆŸe bĂœt pouĆŸita jako rychlejĆĄĂ, citlivÄjsĂ a vysoce specifickĂĄ alternativnĂ metoda ke konvenÄnĂ mikrobiologickĂ© metodÄ. Zkoumali jsme vliv tĆĂ rĆŻznĂœch teplot, 8°C, 12°C a 20°C na rĆŻst S. aureus a tvorbu enterotoxinu D v pasterizovanĂ©m mlĂ©ce a na rĆŻst, expresi genu sed a tvorbu enterotoxinu D v tekutĂ©m mĂ©diu s extraktem z mozku a srdce (BHI). Experimenty byly provĂĄdÄny v malĂœch sklenÄnĂœch fermentorech po 6 dnĂ. GenovĂĄ exprese byla sledovĂĄna pomocĂ qRT-PCR a tvorba enterotoxinu D byla mÄĆena pomocĂ imunologickĂ© metody ELISA. RĆŻstovĂĄ kĆivka v BHI mÄla stejnĂœ prĆŻbÄh pĆi 20°C a 12°C, ale v pĆi 12°C zaÄal rĆŻst se spoĆŸdÄnĂm. PĆi 8°C nebyl pozorovĂĄn ĆŸĂĄdnĂœ rĆŻst. RĆŻst S. aureus v mlĂ©ce byl ve srovnĂĄnĂ s BHI menĆĄĂ. sed mRNA byla detekovĂĄna pĆi 20°C po 4 hodinĂĄch a pĆi 12°C po 7 hodinĂĄch a produkce enterotoxinu se objevila v exponenciĂĄlnĂ fĂĄzi rĆŻstu. V mlĂ©ce se produkce SED pĆi 20°C a pĆi 12°C objevila dĆĂve, ale celkovĂ© mnoĆŸstvĂ vyprodukovanĂ©ho SED bylo niĆŸĆĄĂ neĆŸ v BHI. PĆi 8°C nebyla pozorovĂĄna ĆŸĂĄdnĂĄ produkce SED stejnÄ jako v BHI. DĂĄle byl zkoumĂĄn spoleÄnĂœ vliv nĂzkĂ© teploty 12°C a pĆĂtomnosti kompetitivnĂ doprovodnĂ© mikroflĂłry pochĂĄzejĂcĂ ze surovĂ©ho mlĂ©ka na rĆŻst S. aureus a produkci enterotoxinu v pasterizovanĂ©m mlĂ©ce. Byl pozorovĂĄn inhibiÄnĂ ĂșÄinek na rĆŻst a produkci enterotoxinĆŻ a vliv kompetice byl vĂœraznÄjĆĄĂ neĆŸ vliv nĂzkĂ© teploty. Produkce enterotoxinu byla nĂzkĂĄ a odpovĂdala rĆŻstu. SnĂĆŸenĂm mnoĆŸstvĂ doprovodnĂ© mikroflĂłry a zvĂœĆĄenĂm inokula doĆĄlo pouze k nepatrnĂ©mu zvĂœĆĄenĂ produkce enterotoxinu. V dalĆĄĂ fĂĄzi byly dva rĆŻznĂ© typy sĂœrĆŻ zaoÄkovĂĄny S. aureus za ĂșÄelem simulace sekundĂĄrnĂ kontaminace pĆi vĂœrobÄ sĂœrĆŻ. Vzorky byly odebĂrĂĄny v prĆŻbÄhu 4 tĂœdnĆŻ. KritickĂ© faktory jako jsou kompetitivnĂ mikrofĂłra nebo pH, kterĂ© jsou zodpovÄdnĂ© za regulaci virulence S. aureus byly sledovĂĄny. SnaĆŸili jsem se rozliĆĄit situace pĆi kterĂœch: (i) nenĂ pozorovĂĄn rĆŻst, ale objevuje se produkce enterotoxinu a (ii) dochĂĄzĂ k rĆŻstu ale bez produkce enterotoxinu.Foodborne diseases caused by bacteria are an actual issue worldwide. To produce food, which is safe for human consumption, data about food-borne pathogen virulence is required to complement the already existing knowledge about the bacterial growth and survival in food. There is also a growing need for rapid and sensitive methods to detect these pathogens. In this dissertation, the real-time PCR-based method for the detection of S. aureus in food using selective enrichment and the impact of environmental factors on S. aureus growth and enterotoxin production in milk and cheese are described. We developed a rapid and sensitive method for the detection of S. aureus in food using selective enrichment and a new species-specific real-time PCR. The method facilitated the detection of S. aureus on the next day after the sample reception. This method can be used for S. aureus detection as a faster, highly specific, and more sensitive alternative to the microbiological method. We investigated the effect of three different temperatures, 8°C, 12°C and 20°C on S. aureus growth and SED production in pasteurized milk and on growth, sed gene expression and SED production in Brain heart infusion. The experiments were performed in small-scale fermentors for six days and gene expression was followed by qRT-PCR. SED production was measured using Enzyme-Linked ImmunoSorbent Assay (ELISA). In BHI the growth pattern was the same at 20°C and 12°C but delayed in the latter. At 8°C there was no growth. In milk, growth was lower compared to BHI. sed mRNA was detected at 20°C and 12°C after 4 and 7 hours respectively in BHI and the production occurred during the exponential phase of growth. In milk the SED production at 20°C and 12°C occurred earlier in growth but a lower total amount was produced compared to BHI. At 8°C, there was no SED production like in BHI. The combined effect of low temperature, 12°C, and the presence of competing background microflora derived from raw milk on the growth of S. aureus and SED production in pasteurized milk was further investigated. An inhibitory effect on S. aureus growth and enterotoxin production was observed and the impact of competition was greater than the impact of low temperature. The enterotoxin production was low and correlated with the growth. By lowering the amount of competing microflora and increasing the inoculation level of S. aureus, only a slight increase in enterotoxin production occurred. In the next stage, two different cheese matrices were inoculated with S. aureus to simulate a post-contamination scenario in cheese manufacture. Samples were collected over period of 4 weeks. Critical food factors, like competing microflora and pH, which are responsible for down- and up-regulation of the virulence of S. aureus, were monitored. We tried to indentify if there are situations in which: (i) no growth but enterotoxin formation is observed, and (ii) growth and no enterotoxin formation occurs.
Diagnostic applications of next generation sequencing: working towards quality standards
Over the past 6 years, next generation sequencing (NGS) has been established as a valuable high-throughput method for research in molecular genetics and has successfully been employed in the identification of rare and common genetic variations. All major NGS technology companies providing commercially available instruments (Roche 454, Illumina, Life Technologies) have recently marketed bench top sequencing instruments with lower throughput and shorter run times, thereby broadening the applications of NGS and opening the technology to the potential use for clinical diagnostics. Although the high expectations regarding the discovery of new diagnostic targets and an overall reduction of cost have been achieved, technological challenges in instrument handling, robustness of the chemistry and data analysis need to be overcome. To facilitate the implementation of NGS as a routine method in molecular diagnostics, consistent quality standards need to be developed. Here the authors give an overview of the current standards in protocols and workflows and discuss possible approaches to define quality criteria for NGS in molecular genetic diagnostics
Domain-mediated interactions for protein subfamily identification
Within a protein family, proteins with the same domain often exhibit different cellular functions, despite the shared evolutionary history and molecular function of the domain. We hypothesized that domain-mediated interactions (DMIs) may categorize a protein family into subfamilies because the diversified functions of a single domain often depend on interacting partners of domains. Here we systematically identified DMI subfamilies, in which proteins share domains with DMI partners, as well as with various functional and physical interaction networks in individual species. In humans, DMI subfamily members are associated with similar diseases, including cancers, and are frequently co-associated with the same diseases. DMI information relates to the functional and evolutionary subdivisions of human kinases. In yeast, DMI subfamilies contain proteins with similar phenotypic outcomes from specific chemical treatments. Therefore, the systematic investigation here provides insights into the diverse functions of subfamilies derived from a protein family with a link-centric approach and suggests a useful resource for annotating the functions and phenotypic outcomes of proteins.11Ysciescopu
Qualitative Effects of Knowledge Rules in Probabilistic Data Integration
One of the problems in data integration is data overlap: the fact that different data sources have data on the same real world entities. Much development time in data integration projects is devoted to entity resolution. Often advanced similarity measurement techniques are used to remove semantic duplicates from the integration result or solve other semantic conflicts, but it proofs impossible to get rid of all semantic problems in data integration. An often-used rule of thumb states that about 90% of the development effort is devoted to solving the remaining 10% hard cases. In an attempt to significantly decrease human effort at data integration time, we have proposed an approach that stores any remaining semantic uncertainty and conflicts in a probabilistic database enabling it to already be meaningfully used. The main development effort in our approach is devoted to defining and tuning knowledge rules and thresholds. Rules and thresholds directly impact the size and quality of the integration result. We measure integration quality indirectly by measuring the quality of answers to queries on the integrated data set in an information retrieval-like way. The main contribution of this report is an experimental investigation of the effects and sensitivity of rule definition and threshold tuning on the integration quality. This proves that our approach indeed reduces development effort â and not merely shifts the effort to rule definition and threshold tuning â by showing that setting rough safe thresholds and defining only a few rules suffices to produce a âgood enoughâ integration that can be meaningfully used
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Membrane glycomics reveal heterogeneity and quantitative distribution of cell surface sialylation.
Given that unnatural sugar expression is metabolically achieved, the kinetics and disposition of incorporation can lend insight into the temporal and localization preferences of sialylation across the cell surface. However, common detection schemes lack the ability to detail the molecular diversity and distribution of target moieties. Here we employed a mass spectrometric approach to trace the placement of azido sialic acids on membrane glycoconjugates, which revealed substantial variations in incorporation efficiencies between N-/O-glycans, glycosites, and glycosphingolipids. To further explore the propensity for sialylation, we subsequently mapped the native glycome of model epithelial cell surfaces and illustrate that while glycosylation sites span broadly across the extracellular region, a higher number of heterogeneous glycoforms occur on sialylated sites closest to the transmembrane domain. Beyond imaging techniques, this integrative approach provides unprecedented details about the frequency and structure-specific distribution of cell surface sialylation, a critical feature that regulates cellular interactions and homeostatic pathways
Populous: A tool for populating ontology templates
We present Populous, a tool for gathering content with which to populate an
ontology. Domain experts need to add content, that is often repetitive in its
form, but without having to tackle the underlying ontological representation.
Populous presents users with a table based form in which columns are
constrained to take values from particular ontologies; the user can select a
concept from an ontology via its meaningful label to give a value for a given
entity attribute. Populated tables are mapped to patterns that can then be used
to automatically generate the ontology's content. Populous's contribution is in
the knowledge gathering stage of ontology development. It separates knowledge
gathering from the conceptualisation and also separates the user from the
standard ontology authoring environments. As a result, Populous can allow
knowledge to be gathered in a straight-forward manner that can then be used to
do mass production of ontology content.Comment: in Adrian Paschke, Albert Burger begin_of_the_skype_highlighting
end_of_the_skype_highlighting, Andrea Splendiani, M. Scott Marshall, Paolo
Romano: Proceedings of the 3rd International Workshop on Semantic Web
Applications and Tools for the Life Sciences, Berlin,Germany, December 8-10,
201
Ontologies and Information Extraction
This report argues that, even in the simplest cases, IE is an ontology-driven
process. It is not a mere text filtering method based on simple pattern
matching and keywords, because the extracted pieces of texts are interpreted
with respect to a predefined partial domain model. This report shows that
depending on the nature and the depth of the interpretation to be done for
extracting the information, more or less knowledge must be involved. This
report is mainly illustrated in biology, a domain in which there are critical
needs for content-based exploration of the scientific literature and which
becomes a major application domain for IE
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