نتایج جستجو برای: avirulent pathogens

تعداد نتایج: 71282  

Journal: :Plant physiology 1993
M A Melan X Dong M E Endara K R Davis F M Ausubel T K Peterman

We isolated and characterized a 2.8-kb, full-length, Arabidopsis thaliana cDNA clone encoding a lipoxygenase. DNA sequence analysis showed that the deduced amino acid sequence of the Arabidopsis protein is 72 to 78% similar to that of legume seed lipoxygenases. DNA blot analysis indicated that Arabidopsis contains a single gene, LOX1, with appreciable homology to the cDNA clone. RNA blot analys...

Journal: :Infection and immunity 2003
S M Roche P Gracieux I Albert M Gouali C Jacquet P M V Martin P Velge

Several reports have described Listeria monocytogenes strains which were nonpathogenic or weakly pathogenic, but little is known about these low-virulence strains. We found that 9 field L. monocytogenes strains were hypovirulent and 17 were avirulent, based on the number of mice contaminated and the colonization of their spleens after subcutaneous inoculation. All these strains possessed the kn...

Journal: :The Journal of Experimental Medicine 2002
Yu-Jin Jung Ronald LaCourse Lynn Ryan Robert J. North

Control of infection with virulent Mycobacterium tuberculosis (Mtb) in mice is dependent on the generation of T helper (Th)1-mediated immunity that serves, via secretion of interferon (IFN)-gamma and other cytokines, to upregulate the antimycobacterial function of macrophages of which the synthesis of inducible nitric oxide synthase (NOS)2 is an essential event. As a means to understanding the ...

2014
Rajat Aggarwal Subhashree Subramanyam Chaoyang Zhao Ming-Shun Chen Marion O. Harris Jeff J. Stuart

Highly specialized obligate plant-parasites exist within several groups of arthropods (insects and mites). Many of these are important pests, but the molecular basis of their parasitism and its evolution are poorly understood. One hypothesis is that plant parasitic arthropods use effector proteins to defeat basal plant immunity and modulate plant growth. Because avirulence (Avr) gene discovery ...

Journal: :Journal of economic entomology 2010
Lieceng Zhu Xiang Liu Ming-Shun Chen

We analyzed the accumulation of six phytohormones and phytohormone-related compounds in a wheat, Triticum aestivium L., genotype, 'Molly', after attacks by avirulent and virulent Hessian fly, Mayetiola destructor (Say) (Diptera: Cecidomyiidae), larvae, respectively, and we examined the expression of genes in the jasmonic acid (JA) pathway by Northern blot analysis. Compared with uninfested plan...

Journal: :Journal of innate immunity 2015
James A Tsatsaronis Diane Ly Aleta Pupovac Oliver Goldmann Manfred Rohde Jude M Taylor Mark J Walker Eva Medina Martina L Sanderson-Smith

Polymorphonuclear leukocyte (PMN) cell death strongly influences the resolution of inflammatory episodes, and may exacerbate adverse pathologies in response to infection. We investigated PMN cell death mechanisms following infection by virulent group A Streptococcus (GAS). Human PMNs were infected in vitro with a clinical, virulent GAS isolate and an avirulent derivative strain, and compared fo...

Journal: :Journal of medical microbiology 1990
K Haider A K Azad F Qadri S Nahar I Ciznar

The association of plasmids with virulence characters and O-antigen expression was studied in two virulent and seven avirulent mutant strains of Shigella dysenteriae type 1. Deletion of a 12-Mda segment from a 140-Mda plasmid in two smooth avirulent mutants made the derivatives avirulent in the Sereny test and non-invasive in HeLa cells. The mutants were unable to bind Congo red, and did not ex...

Journal: :Journal of insect physiology 2001
Russo Brehélin Carton

Two strains of Drosophila melanogaster (resistant and susceptible) were parasitized by a virulent or avirulent strain of the parasitoid wasp Leptopilina boulardi. The success of encapsulation depends on both the genetic status of the host strain and the genetic status of the parasitoid strain: the immune cellular reaction (capsule) is observed only with the resistant strain-avirulent strain com...

Journal: :Food Control 2021

Extensive validation of diagnostic assays using widely collected surveillance samples is critical for developing pathogen detection assays. The potentially virulent E. coli strains to the red meat industry. We previously developed two high-resolution melting (HRM) detecting and avirulent O26 O111 strains. Assays were validated enriched beef (n = 36) pork as part a U.S. federal regulatory progra...

2009
J. J. Boomsma

Within-host competition is an important factor in host-parasite relationships, yet most studies consider interactions involving only single parasite species. We investigated the interaction between a virulent obligate entomopathogenic fungus, Metarhizium anisopliae var. anisopliae, and a normally avirulent, opportunistic fungal pathogen, Aspergillus flavus, in their leaf-cutting ant host, Acrom...

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