The Sudanese citrus industry is mainly based on oldline cultivars of grapefruit, sweet orange and willow leaf mandarin, grafted almost exclusively on sour orange. Infection with graft-transmissible agents, viroids in particular, may have deleterious effects on the productivity of these citrus species and, more importantly, limits the choice of rootstocks should sour orange be replaced by altern...

hop stunt viroid (hsvd) isolates have been reported as the causal agent of citrus cachexia in mazandaran province and recently shown to be associated with yellow corky vein disease of sweet orange and split bark disorder of sweet lime in the fars province, iran. in the present work isolation and partial characterization of viroids from citrus trees affected by gummy stem blight is reported from...

Hop stunt viroid (HSVd), a significant pathogen of some hop cultivars, was detected for the first time in hops Australia. Plants were tested graft-transmissible pathogens prior to their use research trials. Upon observing symptoms indicative potential infection, RNA extracted and amplified using reverse transcription polymerase chain reaction (RT-PCR); HSVd identity confirmed by sequencing.

The famous Singular Value Decomposition (SVD) is very efficient in the processing of multidimensional images, when efficient compression, and reduction of the features, used for objects recognition, are needed. The basic obstacle for the wide use of SVD is its high computational complexity. To solve the problem, here is offered the new approach for hierarchical image decomposition through SVD (...

In this paper, a two-sided, parallel Kogbetliantz-type algorithm for the hyperbolic singular value decomposition (HSVD) of real and complex square matrices is developed, with single assumption that input matrix, order n, admits such into product unitary, non-negative diagonal, J-unitary where J given diagonal matrix positive negative signs. When = ±I, proposed computes ordinary SVD. The paper’s...

Abstract Background and Aims: Hop stunt viroid (HSVd, genus Hostuviroid, family Pospiviroidae) has a wide host range among trees and herbaceous plants. The objectives of this study were to compare biological and physical characteristics of three isolates of HSVd from mulberry, fig and citrus and search for other hosts of this viroid in Iran. Materials and Methods: Plant samples were col...

In this paper we focus on model tting techniques in both the time and frequency domain for analysis of biomedical magnetic resonance spectroscopy (MRS) signals. We examine the possibility to obtain accurate estimates of the parameters of selected peaks in the presence of unknown or uninteresting spectral features. We denote this by frequency-selective parameter estimation. A number of existing ...

abstract hop stunt viroid (hsvd) and citrus tristeza virus (ctv) are the causal agents of most important diseases of citrus. previously we reported a novel variant of hsvd that constantly associated with the yellow corky vein disease. here, 19 individual citrus leaves with yellow corky vein symptoms were sampled for ctv by elisa. in this study, most symptomatic samples were found to be infected...