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  • 1
    ISSN: 1573-9171
    Keywords: solid hydrogen cyanide ; photolysis ; radiolysis ; free radicals ; ions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The photolysis of solid hydrogen cyanide and the effects of UV light on60Co-γ-irradiated HCN at 77 K were studied using an ESR technique. As in the case of radiolysis, the HZ2C=N radical formed due to “sticking” of the H atom to the triple bond of the HCN molecule is the main radical product of low-temperature HCN photolysis. The C=N− radicals are accumulated at 77 K in insignificant amounts (≈3 %). It was established that radical and ionic products stabilized in y-irradiated HCN possess photochromism and under the action of UV light enter photochemical reactions leading to their decomposition. Upon photobleaching, the concentration of H2C=N− radicals first increases two- to threefold because of the decomposition of H2C=N− ions and then decreases. The presence of radicals and ions formed upon the low-temperature radiolysis of HCN broadens the optical absorption band of the system, and the boundary of the action spectrum shifts from 280 nm (for nonirradiated HCN) to the visible region at 400–440 nm.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2021-05-19
    Description: Some of the priority activities in the field of reproduction and aquaculture of the Azov Sea fish stocks are presented. We have proposed some areas of research on the development of biotechnologies in the management of spawning stocks of commercially valuable migratory and semi-migratory fish species under controlled environment with the aim to preserve the ecological and genetic status of these species. Recommendations are given on the sustainable development of aquaculture farming.
    Description: Представлены некоторые из приоритетных мероприятий в области воспроизводства рыбных запасов Азовского бассейна и аквакультуры. Предложены направления научных исследований, необходимые при создании биотехнологий формирования маточных стад особо ценных и ценных промысловых проходных и полупроходных рыб в контролируемых условиях среды с целью сохранения их эколого-генетического статуса. Даны рекомендации по стабильному развитию товарного рыбоводства.
    Description: Published
    Keywords: Aquatic living resources ; Biotechnologies ; Broodstocks ; Controlled conditions ; Commercial species ; Spawning farms ; Aquaculture development ; Sturgeon farms ; Recirculating systems ; Vimba ; Acipenser gueldenstaedtii ; Abramis brama ; Huso huso
    Repository Name: AquaDocs
    Type: Conference Material , Non Refereed
    Format: pp.39-43
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