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Muldoon M.T.,SDIX | Allen A.-C.O.,SDIX | Gonzalez V.,SDIX | Sutzko M.,SDIX | And 4 more authors.
Journal of AOAC International | Year: 2012

The SDIX RapidChekTM Listeria F.A.S.T. test system was validated against the U.S. Department of Agriculture-Food Safety and Inspection Service (USDA-FSIS) cultural reference method for the detection of Listeria species on stainless steel, plastic, rubber, and painted concrete. The SDIX method uses a proprietary RapidChek Listeria enrichment media for a one-step, 24-40 h enrichment at 30°C, and detects Listeria on an immunochromatographic lateral flow device in 10 min. Different Listeria species were used to spike each of the environmental surfaces. Environmental surfaces were spiked at levels ranging from 50 to 400 cfu /surface (1 in.2 swabs for painted concrete, 4 in.2 for sponge). A total of 120 spiked samples were tested by the SDIX method at 24 and 40 h and the cultural reference method. Total confirmed positives were 49, 54, and 48 for the SDIX 24 h method, the SDIX 40 h method, and the USDA-FSIS cultural reference method, respectively. Nonspiked samples from all environmental surfaces were reported as negative for Listeria spp. by all methods. The overall Chi square was 0.017 (P = 0.104) and 0.611 (P = 0.566) after a 24 and 40 h enrichment, respectively, indicating that the test method was equivalent in performance to the reference method at both enrichment times. The SDIX method was evaluated for the detection of 50 Listeria and 35 non-Listeria bacterial strains. All 50 Listeria strains were detected by the method (100% sensitivity). Five out of 35 non-Listeria species gave light test signals when grown in nonselective broth culture and tested undiluted. However, when grown in the RapidChek Listeria F.A.S.T. proprietary media, only one bacterial strain (Staphylococcus aureus) was detected, giving a very low test signal (97% specificity). The method was shown to be robust toward several alterations in testing and storage conditions. © 2012 Publishing Technology.


Clotilde L.M.,Magarray, Inc. | Salvador A.,California State University, East Bay | Salvador A.,U.S. Department of Agriculture | Bernard C.,U.S. Department of Agriculture | And 5 more authors.
Foodborne Pathogens and Disease | Year: 2015

Traditionally, serotyping of Escherichia coli has been performed via slide agglutination methods using antisera. More recently, multiplex immunoassays and "molecular serotyping" via polymerase chain reaction (PCR) have been validated for this purpose. In this study, the serogroups of 161 Shiga toxin-producing Escherichia coli (STEC) strains isolated from fecal samples of California cattle were typed by conventional methods using antisera as well as two newly developed multiplex PCR- and antibody-based microbead assays using the Luminex technology. Using the Luminex assays, we were capable of serotyping 11 STEC isolates that were previously determined untypeable for the O antigen by conventional methods using antisera. Except for 14 isolates, results from the 2 Luminex assays agreed. Copyright 2015, Mary Ann Liebert, Inc.


Fancy D.A.,Antigen Design Laboratory | Crowgey E.L.,Antigen Design Laboratory | He Y.,SDIX
PLoS ONE | Year: 2011

Antibodies are quintessential affinity reagents for the investigation and determination of a protein's expression patterns, localization, quantitation, modifications, purification, and functional understanding. Antibodies are typically used in techniques such as Western blot, immunohistochemistry (IHC), and enzyme-linked immunosorbent assays (ELISA), among others. The methods employed to generate antibodies can have a profound impact on their success in any of these applications. We raised antibodies against 10 serum proteins using 3 immunization methods: peptide antigens (3 per protein), DNA prime/protein fragment-boost ("DNA immunization"; 3 per protein), and full length protein. Antibodies thus generated were systematically evaluated using several different assay technologies (ELISA, IHC, and Western blot). Antibodies raised against peptides worked predominantly in applications where the target protein was denatured (57% success in Western blot, 66% success in immunohistochemistry), although 37% of the antibodies thus generated did not work in any of these applications. In contrast, antibodies produced by DNA immunization performed well against both denatured and native targets with a high level of success: 93% success in Western blots, 100% success in immunohistochemistry, and 79% success in ELISA. Importantly, success in one assay method was not predictive of success in another. Immunization with full length protein consistently yielded the best results; however, this method is not typically available for new targets, due to the difficulty of generating full length protein. We conclude that DNA immunization strategies which are not encumbered by the limitations of efficacy (peptides) or requirements for full length proteins can be quite successful, particularly when multiple constructs for each protein are used. © 2011 Brown et al.


Muldoon M.T.,SDIX | Gonzalez V.,SDIX | Sutzko M.I.,SDIX | Allen A.-C.O.,SDIX | And 6 more authors.
Journal of AOAC International | Year: 2011

The RapidChek SELECTTM Salmonella Enteritidis Test System was validated for the detection of Salmonella Enteritidis (SE) in poultry house drag swabs, shell egg pools, and chicken carcass rinsates. The method utilizes RapidChek SELECTTM Salmonella (AOAC PTM License No. 080601) proprietary primary and secondary enrichment media. Following enrichment, an immunochromatographic test strip is inserted into the tube containing the secondary enrichment broth, developed for 10 min, and interpreted. Salmonella Enteritidis-inoculated samples (1-5 CFU SE/analytical unit) were tested by the test method as well as the appropriate cultural reference method U.S. Food and Drug Administration-Bacteriological Analytical Manual (drag swabs and egg pools) or U.S. Department of Agriculture-Food Safety and Inspection Service (chicken carcass rinsates). A total of 80 samples were tested by both methods in the study. Fifty-two samples were positive by the RapidChek SELECT Salmonella Enteritidis method and 38 were found positive by the respective reference method. The sensitivity of the method was 100% and the specificity was 100%. The accuracy of the test method was 137%, indicating that the method was more sensitive than the reference method. The RapidChek SELECT Salmonella Enteritidis method was tested with 82 Salmonella Group D1 strains including 63 Salmonella Enteritidis strains as well as 32 non-Salmonella Group D1 strains representing 10 bacteria genera. The test method detected all 82 Group D1 strains (100% sensitivity). None of the non-Salmonella Group D1 or other genera of bacteria were detected, indicating a specificity of 100%. The method was shown to be highly robust and stable under control and accelerated stability conditions. © 2012 Publishing Technology.


News Article | November 3, 2016
Site: www.newsmaker.com.au

MarketStudyReport.com adds “Global Gonorrhea Diagnostics Market 2016-2020” new report to its research database. The report spread across 62 pages with table and figures in it. The Research analysts forecast the global gonorrhea diagnostics market to grow at a CAGR of 9.25% during the period 2016-2020. Gonorrhea is a sexually transmitted disease that can affect both males and females. It is caused by the bacterium Neisseria gonorrhoeae. The bacterium grows in warm and moist areas of uterus, reproductive tract, fallopian tubes, and urethra. It can also grow and infect the throat, mouth, and anus. Women are more likely to contract this disease than men. Based on the Sexually Transmitted Disease Surveillance 2009 report, the Centers for Disease Control and Prevention (CDC) estimated that gonorrhea is the second most common communicable disease in the US. Browse full table of contents and data tables at https://www.marketstudyreport.com/reports/global-gonorrhea-diagnostics-market-2016-2020/  Covered in this report The report covers the present scenario and the growth prospects of the global gonorrhea diagnostics market for 2016-2020. To calculate the market size, The Research uses revenue generated from the sales of gonorrhea diagnostics products. The market is divided into the following segments based on geography: - Americas - APAC - EMEA The Research report, Global Gonorrhea Diagnostics Market 2016-2020, has been prepared based on an in-depth market analysis with inputs from industry experts. The report covers the market landscape and its growth prospects over the coming years. The report also includes a discussion of the key vendors operating in this market. Key vendors - Abbott Laboratories - Beckman Coulter - Roche Diagnostics - Siemens Other prominent vendors - Agilent Technologies - Alere - Becton Dickinson and Company - Bio-Rad - Cepheid - Diamedix - Kyowa Medex - Lonza - Mackay Life Sciences - Nihon Kohden - Ortho-Clinical Diagnostics - Polymedco - Qiagen - SDIX - Sequenom - Sienco - Sysmex - Takara Bio - Thermo Fisher Market driver - Increase incidence of gonorrhea - For a full, detailed list, view our report Market challenge - Lack of technical expertise - For a full, detailed list, view our report Market trend - Growing use of molecular diagnostics - For a full, detailed list, view our report Key questions answered in this report - What will the market size be in 2020 and what will the growth rate be? - What are the key market trends? - What is driving this market? - What are the challenges to market growth? - Who are the key vendors in this market space? - What are the market opportunities and threats faced by the key vendors? - What are the strengths and weaknesses of the key vendors? To receive personalized assistance write to us @ [email protected] with the report title in the subject line along with your questions or call us at +1 866-764-2150


Hegde N.V.,Pennsylvania State University | Cote R.,Pennsylvania State University | Jayarao B.M.,Pennsylvania State University | Muldoon M.,SDIX | And 3 more authors.
Foodborne Pathogens and Disease | Year: 2012

There is a growing concern of a public health risk associated with non-O157 Shiga toxin-producing Escherichia coli (STEC) since E. coli serogroups O26, O45, O103, O111, O121, and O145 are frequently implicated in outbreaks of human illness worldwide. Recently, the Food Safety and Inspection Service of the U.S. Department of Agriculture declared these six STEC O groups to be adulterants in beef. We describe here a rapid, sensitive, and highly specific enzyme-linked immunosorbent assay (ELISA) for the detection of these top six non-O157 STEC O groups. The assays were tested against 174 reference E. coli O groups, with 60 clinical isolates belonging to the target O groups and 10 non-E coli strains belonging to the family Enterobacteriaceae. Assays for serogroups O103, O111, and O121 exhibited 100% specificity, while assays for serogroups O26 and O45 had 98.2% specificity, and O145 had 99.1% specificity. ELISA conducted using artificially inoculated ground beef samples displayed 100% accuracy. The sensitivity of the assay was 5×105 colony-forming unit (CFU)/mL, with limits of detection in the range of 1-10 CFU/25g of ground beef sample following enrichment. The findings of the study suggest that the assay described is simple and rapid, and can be employed to detect target STEC O groups in beef and other food samples. In addition, the assay provides a conceptual framework that can be adapted for the development of similar tests for the rapid detection of other serogroups of E. coli. © Copyright 2012, Mary Ann Liebert, Inc. 2012.


Tags are widely used to monitor a protein's expression level, interactions, protein trafficking, and localization. Membrane proteins are often tagged in their extracellular domains to allow discrimination between protein in the plasma membrane from that in internal pools. Multipass membrane proteins offer special challenges for inserting a tag since the extracellular regions are often composed of small loops and thus inserting an epitope tag risks perturbing the structure, function, or location of the membrane protein. We have developed a novel tagging system called snorkel where a transmembrane domain followed by a tag is appended to the cytoplasmic C-terminus of the membrane protein. In this way the tag is displayed extracellularly, but structurally separate from the membrane protein. We have tested the snorkel tag system on a diverse panel of membrane proteins including GPCRs and ion channels and demonstrated that it reliably allows for monitoring of the surface expression.


Pfleiderer G.,University of Basel | Battegay M.,University of Basel | Lindpaintner K.,SDIX
Knowing One's Medical Fate in Advance: Challenges for Diagnosis and Treatment, Philosophy, Ethics and Religion | Year: 2012

Modern medicine is now in a position to make advanced prognoses that chart the entire course of illness and recovery. Paradoxically, this is coupled with a new dimension of uncertainty for the patient, i.e. coming to terms with discovering they have an increased risk of a particular disease and deciding what appropriate steps to take. In this publication, renowned experts in their fields discuss these issues. The certainty and uncertainty of one's fate are discussed from both methodological and epidemiological perspectives, using examples of diseases for which treatment and prognosis have dramatically changed. Despite profound insights into the human genome, personalized genetically tailored medicine still lies in the future. Religious, spiritual and philosophical dimensions are discussed, as are the ways in which they may help people cope with these new insights into their future, e.g. the promise of an afterlife. This publication aims to bridge the different fields dealing with this area by addressing the challenges faced and encouraging dialogue. It will be of interest to all readers who deal with ethical problems of prognosis, particularly in medicine, as well as to theologians and sociologists. © 2012 by S. Karger AG, Basel. All rights reserved.


The RapidChek SELECT Salmonella Enteritidis Test System was validated for the detection of Salmonella Enteritidis (SE) in poultry house drag swabs, shell egg pools, and chicken carcass rinsates. The method utilizes RapidChek SELECT Salmonella (AOAC PTM License No. 080601) proprietary primary and secondary enrichment media. Following enrichment, an immunochromatographic test strip is inserted into the tube containing the secondary enrichment broth, developed for 10 min, and interpreted. Salmonella Enteritidis-inoculated samples (1-5 CFU SE/analytical unit) were tested by the test method as well as the appropriate cultural reference method U.S. Food and Drug Administration-Bacteriological Analytical Manual (drag swabs and egg pools) or U.S. Department of Agriculture-Food Safety and Inspection Service (chicken carcass rinsates). A total of 80 samples were tested by both methods in the study. Fifty-two samples were positive by the RapidChek SELECT Salmonella Enteritidis method and 38 were found positive by the respective reference method. The sensitivity of the method was 100% and the specificity was 100%. The accuracy of the test method was 137%, indicating that the method was more sensitive than the reference method. The RapidChek SELECT Salmonella Enteritidis method was tested with 82 Salmonella Group D1 strains including 63 Salmonella Enteritidis strains as well as 32 non-Salmonella Group D1 strains representing 10 bacteria genera. The test method detected all 82 Group D1 strains (100% sensitivity). None of the non-Salmonella Group D1 or other genera of bacteria were detected, indicating a specificity of 100%. The method was shown to be highly robust and stable under control and accelerated stability conditions.


PubMed | SDIX
Type: Journal Article | Journal: PloS one | Year: 2013

Tags are widely used to monitor a proteins expression level, interactions, protein trafficking, and localization. Membrane proteins are often tagged in their extracellular domains to allow discrimination between protein in the plasma membrane from that in internal pools. Multipass membrane proteins offer special challenges for inserting a tag since the extracellular regions are often composed of small loops and thus inserting an epitope tag risks perturbing the structure, function, or location of the membrane protein. We have developed a novel tagging system called snorkel where a transmembrane domain followed by a tag is appended to the cytoplasmic C-terminus of the membrane protein. In this way the tag is displayed extracellularly, but structurally separate from the membrane protein. We have tested the snorkel tag system on a diverse panel of membrane proteins including GPCRs and ion channels and demonstrated that it reliably allows for monitoring of the surface expression.

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