Garnik Khachatryan

Garnik Khachatryan
Yerevan Physics Institute · Applied R & D Division

PhD

About

18
Publications
1,481
Reads
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83
Citations
Citations since 2017
4 Research Items
15 Citations
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201720182019202020212022202301234
201720182019202020212022202301234
Additional affiliations
January 1981 - March 2020
Yerevan Physics Institute
Position
  • Head of Department
Description
  • (i) Applied Microbiology and Biochemistry, Radioecology, Radiobiology, Environmental Protection
Education
September 1971 - August 1976
Yervan State University
Field of study
  • Biological Faculty, Dept. of Biophysics

Publications

Publications (18)
Article
Full-text available
Purpose: To investigate sources, accumulation, and vertical migration of radionuclides in Armenia, and their impact on biota. Conclusion: This review describes the radiation status in the landscape of Armenia and features of the impact of natural and human-generated radiation on human and non-human biotas, according to studies of Armenian scient...
Article
Full-text available
The paper represents the study of ultrashort electron beams impact on some Escherichia coliK-12strains with different radiosensitivity. The charged particle beams generated by ultrashort bunch accelerators differ by short duration of particle direct exposure, relatively long intervals between bunches and by high values of instantaneous dose rates....
Article
Full-text available
Chitosan, a derivative of chitin, one of the most widespread natural polysaccharides, is of great interest in terms of practical application. The importance of this polymer and its derivatives cannot be overestimated since it is currently used in such spheres of human activity as medicine, agriculture, food and textile industries, nuclear medicine,...
Article
Full-text available
Use of antimicrobials in both human and animal populations over the past several decades has led to the emergence of multidrug‐resistant bacteria populations that are resistant to many commercially available drugs. For example, acquired resistance to first‐line antimicrobial agents increasingly complicates the management of extra‐intestinal infecti...
Chapter
The distribution of 137Cs in the soils adjoining to Armenian Nuclear Power Plant along the predominant direction of winds is investigated. It is shown that the maximum on the curve of distribution of 137Cs corresponds to the leeward of ANPP, indicating a specific content of 137Cs that exceeds the background level due to the global fallout by about...
Conference Paper
Full-text available
The consequences of interaction of the bacterium-pesticide by the way of example of the growth of some soil aerobic bacteria on different media containing preparation actara (insecticide) or only its active component thiamethoxam are presented. It's shown that the presence of actara in the nutrient meat-peptone agar leads to restriction or complete...
Article
From the samples of soils taken from the sites adjoining to the Armenian Nuclear Power Plant along the predominant direction of winds representatives of rather radiosensitive closely-related species of bacteria Pseudomonas putida and P. fluorescens and rather radioresistant bacilli B. me-sentericus and B. subtilis were isolated. Their quantitative...
Article
By the use of detectors with NaI and pure germanium, supplied with corresponding programs, the distribution of 137Cs in soil in the region of Armenian Nuclear Power Plant (NPP) location along a primary direction of winds movement has been investigated. It is shown, that on the curve of 137Cs distribution there is a maximum alee, specifying the cont...
Thesis
Full-text available
One of the major issues of modern ecology is the consequence of large-scale application of pesticides on soil microbial community. This problem has not been actively discussed in the scientific literature, because of complexity of both estimation of occurring processes, and the remote consequences of the influence of pesticides in view of multifact...
Article
Full-text available
Ability of some cultures of the microorganisms isolated from the soil on the territory of the burial ground of agricultural pesticides (“the Nubarashen burial ground of toxic compounds”) to destroy the chlorine-containing insecticides thiamethoxam (“ACTARA”) and imidacloprid (“CONFIDOR”) was investigated. A number of cultures, tolerant to the prese...
Article
Full-text available
The results of the investigation of the biological efficiency of accelerated electrons with the energy of 7.5 MeV on their letal action on the cells of Escherichia Coli K-12 bacteria with the different reparation genotype are presented. The received results are discussed from the position of existing representations regarding the role of the balanc...
Article
Several strains of aerobic bacteria tolerant to some chemical toxins were isolated from the water of man-made Yerevan Lake and from the soil and air of different regions of the city of Yerevan. Some of these bacteria were capable of degrading 2,4,6-trinitrotoluene (TNT) during shake-flask fermentation in liquid medium. Two bacterial strains with go...
Article
Twelve strains of Pseudomonas fluorescens and P. putida were grown in a synthetic medium that contained L-lysine as the only source of carbon and nitrogen, and screened for L-lysine-2-monooxygenase production. Best production was by P. putida BKM B-1458 at 30 IU/g wet wt biomass when grown in a shake-flask but 25 IU/g in a 250-l fermenter.
Article
A biosensor to quantify L-proline within 10(-5)-10(-3) mole/L concentration is described. Immobilized Pseudomonas sp. cells grown in a medium containing L-proline as the only source of carbon and nitrogen were used to create the biosensor. The cells oxidized L-proline specifically consuming O2 and did not react with other amino acids and sugars. Th...
Article
A flow-through analyzer is described for L-lysine concentration determination based on an oxygen electrode and L-lysine-2-monooxygenase immobilized on silica gel. The range of the L-lysine concentration determination is from 5·5 to 55 mm (1–10 g/litre), pH 8·2. The analyzer is characterized by high specificity of the L-lysine determination. The res...
Article
Isolation and purification of L-lysine-2- monooxygenase from the bacterium Pseudomonas species was carried out. The purification procedure included ammonium sulfate fractionation, acid treatment, gel filtration through Sephadex G-200 and ion-exchange chromatography on DEAE-Sephadex A-50. Such treatment resulted in more than 220-fold purification an...

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