نتایج جستجو برای: host resistance to diseases
تعداد نتایج: 10866182 فیلتر نتایج به سال:
There is increasing evidence that chronic, subclinical exposure to certain environmental pollutants may upset immune responsiveness and alter susceptibility of animals to infectious agents. Environmental chemicals or drugs may affect diverse aspects of the immune system, leading to immunosuppression, immunopotentiation, hypersensitivity or perturbed innate host resistance. A variety of infectio...
The genetic polymorphism maintained by host-pathogen coevolution is analyzed in a multilocus model. The model assumes gene-for-gene interactions of the type commonly observed between host plants and their fungal pathogens. Unstable (epidemic) systems maintain more resistance genes, fewer virulence genes, and less overall genetic diversity than stable (endemic) diseases. The stability of the sys...
Introduction and purpose: Ticks as biological vectors and reservoirs of diseases, such as Crimean-Congo hemorrhagic fever (CCHF), have an important role in the transmission of pathogens to humans and animals. In this regard, this study aimed to determine the biodiversity indices, distribution, and fauna of the vectors of CCHF in Ahvaz, Iran. Methods: The tick samples were collected and identif...
The transcript levels of six defense genes including pathogenesis-related gene 1 (PR-1), pathogenesis-related gene 2 (PR-2), pathogenesis-related gene 5 (PR-5), lipoxygenase (LOX), phenylalanine ammonia-lyase (PAL) and catalase (CAT) were investigated in tomato plants inoculated with Xanthomonas axonopodis pv. phaseoli as a non-host pathogen and X. euvesicatoria as a host pathogen. Activation o...
Introduction: Epigenetic mechanisms regulate expression of the genome to generate various cell types during development or coordinate cellular responses to external stimulus. While epigenetics is of fundamental importance in eukaryotes, it plays a different role in bacteria. This article uncovers the most important recent data on how bacteria can alter epigenetic marks and can also contribute t...
The clinical features, diagnostic considerations and recommended management for selected viral diseases, aphthae and decreased host resistance diseases affecting the oral cavities of young persons are presented. Viral diseases frequently present as subclassic disease manifested as transient gingivitis with little or no evidence of infection. Such viral diseases should be treated with general su...
A recently published article describing the draft genome of Erwiniamallotivora BT-Mardi (1), the causal pathogen of papaya dieback infection in Peninsular Malaysia, hassignificant potential to overcome and reduce the effect of this vulnerable crop (2). The authors found that the draft genome sequenceis approximately 4824 kbp and the G+C content of the genomewas 52-54%, which is very similarto t...
Leishmaniasis is a major public health problem, but so far there are no effective commercially available vaccines for this disease. Its control strategy is only reliant on therapy, but currently the drugs available for the treatment of leishmaniasis are also limited and a great concern is the rapid rate of resistance to common drugs. The first step in discovery and development of new drugs is t...
Meningitis caused by L. monocytogenes is discussed from the standpoints of clinical presentation and course, underlying illness, and altered host resistance. The `opportunistic' nature of the infection is emphasized, and case histories of patients with diseases which may specifically alter host resistance in such a fashion as to render the patient susceptible to this organism, or who are receiv...
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