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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Russian chemical bulletin 45 (1996), S. 1623-1627 
    ISSN: 1573-9171
    Keywords: polymers ; fluorination ; free radicals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The formation of free radicals in the process of direct fluorination of natural and synthetic polymers at temperatures close to 77 K was studied by ESR. The maximum concentrations of radicals, (1017–5·1018 spin g−1) and their complete oxidation were observed in the temperature interval from 77 to 250 K at a fluorine pressure of 30 Torr. The initiation of chain halogenation, which consists of homolytic breaking of chemical bonds to yield free-radical intermediates. was examined in the framework of the multi-center synchronous transitions model.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2021-05-19
    Description: Data on the features of the Black Sea horse mackerel annual cycle and gametogenesis are presented. A relatively long spawning period (up to 4 months) influences metabolism of the horse mackerel specimens. During the pre-spawning period, high fat and protein content in liver and muscles is maintained in their body, which is necessary for the gametogenesis process to take place. The long spawning period of the studied species results from the intermittent maturation of reproductive products and presence of oocytes from different generations in the horse mackerel's ovaries. In the spawning period, increase in protein and fat content in gonads and decrease in fat content in muscles and liver almost in 2 times is recorded. After prolonged spawning, rapid restoration of the horse mackerel physiological state occurs due to high metabolic rate. As its feeding period ends, horse mackerel moves to its wintering sites. High fat content in tissues (up to 45 % in muscle tissue and 51 % in liver) allows it to survive winter successfully, because under the decreased water temperature, it is almost inactive and feeds scarcely.
    Description: Представлены материалы, характеризующие особенности гаметогенеза и годового цикла черноморской ставриды. Достаточно продолжительный нерест (до 4 месяцев) сказывается на особенностях обмена веществ этих рыб. В течение преднерестового периода в организме рыб поддерживается высокое содержание белка и жира в печени и мышцах, необходимых для осуществления процессов гаметогенеза. Длительный нерест ставриды обеспечивается порционностью созревания половых продуктов, наличием в яичниках ставриды ооцитов разных поколений. В нерестовый период отмечается увеличение содержания белка и жира в гонадах и снижение количества жира в мышцах и печени почти в 2 раза. После продолжительного нереста происходит быстрое восстановление физиологического статуса благодаря интенсивному обмену веществ. По окончании нагула ставрида мигрирует к местам зимовки. Высокое содержание жира в тканях (до 45 % в мышцах и 51 % в печени) позволяет ей благополучно перенести зиму, так как при понижении температуры воды она малоподвижна и почти не питается.
    Description: Published
    Keywords: Horse mackerel ; Maturation ; Spawning period ; Oocytes ; Proteins ; Fat ; Tissues ; Liver ; Gonads ; Gametogenesis ; Overwintering ; Metabolism
    Repository Name: AquaDocs
    Type: Conference Material , Non Refereed
    Format: pp.88-91
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  • 3
    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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