ABSTRACT
Monitoring of viruses of tomato plants (Lycopersicon esculentum Mill.) was carried out. Twenty-seven varieties of tomatoes from different regions of Ukraine were tested for the virus presence. New symptoms, which had not been described before, were revealed. It was found out that the diseases were caused by Potato virus M and Potato virus Y. This is the first report about the infection of tomato plants with such viruses in Ukraine. Some biological, physical and chemical properties of the pathogens are studied. Differences between PVM, PVY and the known isolates were found in morphology and molecular weight of structural protein.
Subject(s)
Plant Diseases/virology , Potyvirus/ultrastructure , Solanum lycopersicum/virology , Capsid/chemistry , Host Specificity , Solanum lycopersicum/ultrastructure , Microscopy, Electron , Molecular Typing , Molecular Weight , Polymerase Chain Reaction , Potyvirus/classification , Potyvirus/genetics , Potyvirus/isolation & purification , Species Specificity , Ukraine , Viral Structural Proteins/analysisABSTRACT
In 1986-1988, we examined 1105 children no older than 15 years with various forms of hypoacusis. It was found that measurement of acoustic impedance can help topical diagnosis at any age, especially in children younger than 3 years. In 1988, we examined 350 children with conductive hypoacusis. The specific features of tympanography and acoustic reflexes allow early and accurate diagnosis of middle ear abnormalities. It is stressed that measurement of acoustic impedance may play an important role in examinations of patients with middle ear pathologies.
Subject(s)
Acoustic Impedance Tests , Hearing Disorders/diagnosis , Adolescent , Age Factors , Child , Child, Preschool , Ear Diseases/complications , Ear Diseases/diagnosis , Hearing Disorders/etiology , Humans , InfantABSTRACT
Electroacoustic correction of hearing impairment is of crucial importance for children because it improves their rehabilitation and mental development. The principal objective of hearing corrective measures is to provide patients with hearing aids selected as early as possible on an individual basis. When selecting hearing aids, many clinical and audiological factors should be taken into consideration. The hearing function should be examined and the level of mental and verbal development should be assessed. There are some children who urgently need hearing aids and there are others for whom they are contraindicated. Electroacoustic correction of hearing loss in children can be effective if hearing problems are reliably diagnosed at an early stage and if hearing aids meet individual requirements of the affected child.
