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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: The materials of 2014–2016 are presented. They characterize the physiological state of the Pontic shad breeders that migrate for spawning from the Black and Azov Seas to the Don River. In 2014–2015, at the beginning of the spawning period, high values of condition factor, as well as of the fat and protein content in the muscles and liver were observed in shad breeders, which gives evidence of the good pre-spawning fish feeding. By the end of spawning, the values of these indicators have decreased because of significant expenditure of energy resources due to prolonged spawning. In 2016, for the first time over the entire period of our studies, certain deterioration in the physiological state of the breeders and their readiness for spawning was noted. Compared with the long-term average annual data, the content of protein and fat in muscles and liver significantly decreased. We associate the cause of the deterioration of the Pontic shad state with change in the conditions of its fattening in 2015–2016.
    Description: Представлены материалы 2014–2016 гг., характеризующие физиологическое состояние производителей черноморско-азовской проходной сельди, заходящей на нерест в р. Дон. В период 2014–2015 гг. в начале нерестового хода у производителей сельди отмечались высокие значения коэффициента упитанности, содержания жира и белка в мышцах и печени, свидетельствующие о хорошем преднерестовом нагуле рыб. К концу нереста значения этих показателей снизились, что связано со значительными тратами энергетических ресурсов на продолжительное икрометание. В 2016 г. впервые за весь период наших исследований отмечено ухудшение физиологического состояния производителей и их подготовленности к нересту. По сравнению со среднемноголетними данными значительно снизилось содержание белка и жира в мышцах и печени. Причину ухудшения состояния черноморско-азовской проходной сельди мы связываем с изменением условий ее нагула в 2015–2016 гг.
    Description: Published
    Keywords: Animal physiology ; Breeders ; Spawning migrations ; Long-term records ; Proteins ; Fattening ; Alosa immaculata ; Muscles
    Repository Name: AquaDocs
    Type: Conference Material , Non Refereed
    Format: pp.160-163
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