scholarly journals Bioprospecting for Trichothecene 3-O-Acetyltransferases in the Fungal GenusFusariumYields Functional Enzymes with Different Abilities To Modify the Mycotoxin Deoxynivalenol

2010 ◽  
Vol 77 (4) ◽  
pp. 1162-1170 ◽  
Author(s):  
Piyum A. Khatibi ◽  
Sean A. Newmister ◽  
Ivan Rayment ◽  
Susan P. McCormick ◽  
Nancy J. Alexander ◽  
...  
Keyword(s):  
United States ◽  
Time Course ◽  
The United States ◽  
Trichothecene Mycotoxin ◽  
Steady State Kinetic ◽  
Extended Sequence ◽  
Small Grains ◽  
State Kinetic ◽  
New Strategies

ABSTRACTThe trichothecene mycotoxin deoxynivalenol (DON) is a common contaminant of small grains, such as wheat and barley, in the United States. New strategies to mitigate the threat of DON need to be developed and implemented. TRI101 and TRI201 are trichothecene 3-O-acetyltransferases that are able to modify DON and reduce its toxicity. Recent work has highlighted differences in the activities of TRI101 from two different species ofFusarium(F. graminearumandF. sporotrichioides), but little is known about the relative activities of TRI101/TRI201 enzymes produced by other species ofFusarium. We clonedTRI101orTRI201genes from seven different species ofFusariumand found genetic identity between sequences ranging from 66% to 98%.In vitrofeeding studies using transformed yeast showed that all of the TRI101/TRI201 enzymes tested were able to acetylate DON; conversion of DON to 3-acetyl-deoxynivalenol (3ADON) ranged from 50.5% to 100.0%, depending on theFusariumspecies from which the gene originated. A time course assay showed that the rate of acetylation varied from species to species, with the gene fromF. sporotrichioideshaving the lowest rate. Steady-state kinetic assays using seven purified enzymes produced catalytic efficiencies for DON acetylation ranging from 6.8 × 104M−1·s−1to 4.7 × 106M−1·s−1. Thermostability measurements for the seven orthologs ranged from 37.1°C to 43.2°C. Extended sequence analysis of portions ofTRI101/TRI201from 31 species ofFusarium(including known trichothecene producers and nonproducers) suggested that other members of the genus may contain functionalTRI101/TRI201genes, some with the potential to outperform those evaluated in the present study.

Correlative microscopy in distrubuted (client/server) computing environments: tools for catalyzing the rapid dissemination of information about the cell biology of the human prostate

1995 ◽  
Vol 53 ◽  
pp. 682-683
Author(s):  
A. Hakam ◽  
J.T. Gau ◽  
M.L. Grove ◽  
B.A. Evans ◽  
M. Shuman ◽  
...  
Keyword(s):  
United States ◽  
Cell Biology ◽  
Tissue Bank ◽  
The United States ◽  
Prostate Adenocarcinoma ◽  
Correlative Microscopy ◽  
Client Server ◽  
Critical Elements ◽  
Transplant Organ

Prostate adenocarcinoma is the most common malignant tumor of men in the United States and is the third leading cause of death in men. Despite attempts at early detection, there will be 244,000 new cases and 44,000 deaths from the disease in the United States in 1995. Therapeutic progress against this disease is hindered by an incomplete understanding of prostate epithelial cell biology, the availability of human tissues for in vitro experimentation, slow dissemination of information between prostate cancer research teams and the increasing pressure to “ stretch” research dollars at the same time staff reductions are occurring.To meet these challenges, we have used the correlative microscopy (CM) and client/server (C/S) computing to increase productivity while decreasing costs. Critical elements of our program are as follows:1) Establishing the Western Pennsylvania Genitourinary (GU) Tissue Bank which includes >100 prostates from patients with prostate adenocarcinoma as well as >20 normal prostates from transplant organ donors.

scholarly journals Assessing the Phytosanitary Risk Posed by an Intraspecific Invasion of Cryphonectria parasitica in Europe

2019 ◽  
Vol 109 (12) ◽  
pp. 2055-2063 ◽  
Author(s):  
Francesca Dennert ◽  
Joana Beatrice Meyer ◽  
Daniel Rigling ◽  
Simone Prospero
Keyword(s):  
United States ◽  
South Korea ◽  
Plant Pathogens ◽  
Castanea Sativa ◽  
The United States ◽  
Cryphonectria Parasitica ◽  
Seedling Mortality ◽  
New Host ◽  
Phytosanitary Measures

Intraspecific cryptic invasions may occur when new strains of an invasive species are introduced into an area where this species had already been introduced previously. In plant pathogens, such invasions are not well studied, even if, potentially, they can have severe consequences. Here, we investigated the effects of a potential intraspecific invasion in Europe of Cryphonectria parasitica, the causal agent of chestnut blight. Specifically, we tested the hypotheses that (i) non-European strains are more virulent on Castanea sativa than those already present in Europe because they have never encountered this new host, and (ii) the variation in virulence among strains is higher within native than within introduced populations. In a greenhouse, 2-year-old C. sativa seedlings were inoculated with Cryphonectria parasitica strains from South Korea, the United States, and Switzerland, and lesion development and seedling mortality were recorded weekly. Additionally, growth and sporulation of the strains were measured in vitro on agar medium at 15 and 24°C. Although lesion growth was similar for all strains, seedlings inoculated with strains from South Korea and Switzerland died faster than seedlings inoculated with strains from the United States. Moreover, in vitro strains from South Korea grew faster and produced more spores at both temperatures than the strains from the other two countries. In conclusion, our results did not support the two hypotheses. All strains, regardless of their origin, were found to be highly virulent on the inoculated chestnut seedlings. Nevertheless, current phytosanitary measures to avoid the introduction of new genotypes of C. parasitica into Europe should be further implemented.

scholarly journals H5N2 Avian Influenza Outbreak in Texas in 2004: the First Highly Pathogenic Strain in the United States in 20 Years?

2005 ◽  
Vol 79 (17) ◽  
pp. 11412-11421 ◽  
Author(s):  
Chang-Won Lee ◽  
David E. Swayne ◽  
Jose A. Linares ◽  
Dennis A. Senne ◽  
David L. Suarez
Keyword(s):  
United States ◽  
Amino Acid ◽  
Avian Influenza ◽  
Cleavage Site ◽  
Basic Amino Acid ◽  
The United States ◽  
Influenza Viruses ◽  
Single Point Mutation ◽  
Highly Pathogenic

ABSTRACT In early 2004, an H5N2 avian influenza virus (AIV) that met the molecular criteria for classification as a highly pathogenic AIV was isolated from chickens in the state of Texas in the United States. However, clinical manifestations in the affected flock were consistent with avian influenza caused by a low-pathogenicity AIV and the representative virus (A/chicken/Texas/298313/04 [TX/04]) was not virulent for experimentally inoculated chickens. The hemagglutinin (HA) gene of the TX/04 isolate was similar in sequence to A/chicken/Texas/167280-4/02 (TX/02), a low-pathogenicity AIV isolate recovered from chickens in Texas in 2002. However, the TX/04 isolate had one additional basic amino acid at the HA cleavage site, which could be attributed to a single point mutation. The TX/04 isolate was similar in sequence to TX/02 isolate in several internal genes (NP, M, and NS), but some genes (PA, PB1, and PB2) had sequence of a clearly different origin. The TX/04 isolate also had a stalk deletion in the NA gene, characteristic of a chicken-adapted AIV. By analyzing viruses constructed by in vitro mutagenesis followed by reverse genetics, we found that the pathogenicity of the TX/04 virus could be increased in vitro and in vivo by the insertion of an additional basic amino acid at the HA cleavage site and not by the loss of a glycosylation site near the cleavage site. Our study provides the genetic and biologic characteristics of the TX/04 isolate, which highlight the complexity of the polygenic nature of the virulence of influenza viruses.

Assessment of Laboratory Performance With Streptococcus pneumoniae Antimicrobial Susceptibility Testing in the United States

1999 ◽  
Vol 123 (4) ◽  
pp. 285-289 ◽  
Author(s):  
Gary V. Doern ◽  
Angela B. Brueggemann ◽  
Michael A. Pfaller ◽  
Ronald N. Jones
Keyword(s):  
United States ◽  
Streptococcus Pneumoniae ◽  
Antimicrobial Agents ◽  
Susceptibility Testing ◽  
Clinical Laboratory ◽  
The United States ◽  
National Committee ◽  
In Vitro Susceptibility ◽  
Susceptibility Tests

Abstract Objective.—To assess the performance of clinical microbiology laboratories in the United States when conducting in vitro susceptibility tests with Streptococcus pneumoniae. Methods.—The results of a nationwide College of American Pathologists Proficiency Survey test sample, in which susceptibility testing of an isolate of S pneumoniae was performed, were assessed with respect to precision and accuracy. Results.—Wide variability was noted among participating laboratories with both minimum inhibitory concentration procedures and disk diffusion susceptibility tests when both methods were applied to S pneumoniae. Despite this high degree of variation, categorical interpretive errors were uncommon. Numerous laboratories reported results for antimicrobial agents that are not recommended by the National Committee for Clinical Laboratory Standards for tests with S pneumoniae. Conclusions.—Current susceptibility testing practices with S pneumoniae in the United States indicate limited precision and a tendency for laboratories to test and report results obtained with antimicrobial agents of questionable therapeutic value against this organism. Continued efforts to standardize susceptibility testing of S pneumoniae in the United States are warranted. In addition, modifications of existing interpretive criteria may be necessary.

scholarly journals Nebulizer – In vitro Bioequivalence testing requirements: A review

1970 ◽  
Vol 8 (1) ◽  
pp. 78-81
Author(s):  
Shubham Prajapati ◽  
Sanjay Saha ◽  
B Shambulingappa ◽  
Dilip Kumar Ch. ◽  
Bikash Sahoo
Keyword(s):  
United States ◽  
Size Distribution ◽  
United States Of America ◽  
Droplet Size Distribution ◽  
The United States ◽  
Drug Substance ◽  
Regulatory Agencies ◽  
Metered Dose ◽  
Radiological Health

Generic Nebulized aerosol is often perceived as inferior to their branded counterparts; however, they are safe and effective if they can meet the regulatory requirements. International regulatory agencies have developed recommendations and guidance for bioequivalence approaches of orally inhaled drug products (OIDPs) for local action. The objective of this article is to discuss the approaches can be used for to show bioequivalence requirement for Food and Drug Administration (FDA) in the United States of America (USA) with reference product. This review endorsed that inhalation solutions and suspensions undertaken to determine the drug substance delivery rate, total drug substance delivered and Aerodynamic assessment of nebulized aerosols [aerodynamic particle size distribution (APSD)/droplet size distribution (DSD)].These are the most important parameters in characterization, evaluation and bioequivalence studies of nebulizers. These devices operate continuously; once loaded and require little or no co-ordination on the part of user they proved that these devices suitable for weak, pediatric or geriatric patients. The regulatory agencies declared that; there is no specific requirements testing in case of nebulizers like Metered dose inhalers (MDI) and Dry powder inhalers (DPIs). In United States of America (USA) regulation falls under the auspices of centre for devices and radiological health (CDRH), and new devices require 510(k) premarket notification. This review outlines all the bioequivalence test parameter.  

scholarly journals Fungicide Sensitivity of U.S. Genotypes of Phytophthora infestans to Six Oomycete-Targeted Compounds

Plant Disease ◽  
2015 ◽  
Vol 99 (5) ◽  
pp. 659-666 ◽  
Author(s):  
Amanda Saville ◽  
Kim Graham ◽  
Niklaus J. Grünwald ◽  
Kevin Myers ◽  
William E. Fry ◽  
...  
Keyword(s):  
United States ◽  
Phytophthora Infestans ◽  
The United States ◽  
Effective Concentration ◽  
Response Curves ◽  
Baseline Sensitivity ◽  
Fungicide Sensitivity ◽  
The Past ◽  
The Us

Phytophthora infestans causes potato late blight, an important and costly disease of potato and tomato crops. Seven clonal lineages of P. infestans identified recently in the United States were tested for baseline sensitivity to six oomycete-targeted fungicides. A subset of the dominant lineages (n = 45) collected between 2004 and 2012 was tested in vitro on media amended with a range of concentrations of either azoxystrobin, cyazofamid, cymoxanil, fluopicolide, mandipropamid, or mefenoxam. Dose-response curves and values for the effective concentration at which 50% of growth was suppressed were calculated for each isolate. The US-8 and US-11 clonal lineages were insensitive to mefenoxam while the US-20, US-21, US-22, US-23, and US-24 clonal lineages were sensitive to mefenoxam. Insensitivity to azoxystrobin, cyazofamid, cymoxanil, fluopicolide, or mandipropamid was not detected within any lineage. Thus, current U.S. populations of P. infestans remained sensitive to mefenoxam during the displacement of the US-22 lineage by US-23 over the past 5 years.

scholarly journals Extremities of body mass index and their association with pregnancy outcomes in women undergoing in vitro fertilization in the United States

2016 ◽  
Vol 106 (7) ◽  
pp. 1742-1750 ◽  
Author(s):  
Jennifer F. Kawwass ◽  
Aniket D. Kulkarni ◽  
Heather S. Hipp ◽  
Sara Crawford ◽  
Dmitry M. Kissin ◽  
...  
Keyword(s):  
United States ◽  
Body Mass Index ◽  
In Vitro Fertilization ◽  
Body Mass ◽  
Pregnancy Outcomes ◽  
The United States ◽  
Vitro Fertilization
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