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Circadian rhythms of feeding with microalgae of Ceriodaphnia quadrangula in laboratory culture / V. I. Kolmakov [и др.] // Biofizika. - 2002. - Vol. 47, Is. 4. - С. 673-676 . - ISSN 0006-3029
Кл.слова (ненормированные):
chlorophyll -- alga -- animal -- article -- chemistry -- circadian rhythm -- Crustacea -- fluorometry -- growth, development and aging -- photoperiodicity -- physiology -- Algae -- Animals -- Chlorophyll -- Circadian Rhythm -- Crustacea -- Fluorometry -- Photoperiod
Аннотация: The circadian rhythm of grazing of microalgae by a laboratory culture of Ceriodaphnia quadrangula under continuous illumination was studied by continuous registration of chlorophyll fluorescence at the outlet of a flow-through cultivator. A culture of green alga Chlorella vulgaris was used as a feed. The data obtained were treated by the statistical spectral analysis. It was found that animals preliminarily grown under a 12 h light: 12 h dark regime and transferred to constant light showed two maxima in the circadian rhythm of grazing with periods of 0.7 and 1.1 h. Animals preliminarily grown under constant light showed no circadian rhythm of grazing. It was concluded that the circadian rhythm of grazing of C. quadrangula has endogenous nature and can change according to light conditions.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036 Russia. : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Kolmakov, V.I.; Levin, L.A.; Dubovskaia, O.P.; Gladyshev, M.I.

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Determination of the bacterial concentration in freshwater reservoirs and streams by fluorometry [Text] / L. A. Shchur [et al.] // Microbiology. - 1997. - Vol. 66, Is. 6. - P. 726-728. - Cited References: 8 . - ISSN 0026-2617

РУБ Microbiology

Кл.слова (ненормированные):
concentration and biomass of bacterioplankton -- fluorescence -- regression equation
Аннотация: A simple fluorometric method is proposed for rapid determination of the concentration or biomass of bacterioplankton in various natural freshwater reservoirs and streams directly under field conditions. Fluorescamine, which specifically binds to proteins and amino acids in microbial cells, was used as the fluorescent marker. Regression equations were calculated on the basis of the results obtained. The coefficient of correlation between the fluorescence intensity and the bacterial biomass (cell number) was found to be 0.93 (0.89) for the total body of data obtained in the reservoirs studied.

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Держатели документа:
Russian Acad Sci, Inst Biophys, Siberian Div, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Shchur, L.A.; Aponasenko, A.D.; Lopatin, V.N.; Filimonov, V.S.; Shepelevich, N.V.

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Daily rhythm of grazing of Ceriodaphnia quadrangula on microalgae by data of continuous fluorometry in flowing cultivator [Текст] / M. I. Gladyshev [и др.] // Dokl. Akad. Nauk. - 1997. - Vol. 356, Is. 4. - P. 548-550. - Cited References: 7 . - ISSN 0869-5652

РУБ Multidisciplinary Sciences

WOS
Держатели документа:
Russian Acad Sci, Inst Biophys, Krasnoyarsk, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50
Доп.точки доступа:
Gladyshev, M.I.; Kolmakov, V.I.; Levin, L.A.; Dubovskaya, O.P.

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Effect of light intensity on chlorophyll fluorescence in wheat leaves: Application of PAM-fluorometry / V. N. Shikhov, T. V. Nesterenko, A. A. Tikhomirov // Russ. J. Plant Physiol. - 2016. - Vol. 63, Is. 3. - P417-422, DOI 10.1134/S1021443716030134 . - ISSN 1021-4437
Кл.слова (ненормированные):
actinic light intensity -- induction of chlorophyll fluorescence -- leaf ontogeny -- Triticum aestivum
Аннотация: Application of pulse-amplitude-modulation (PAM) fluorometers for measuring slow stages of chlorophyll fluorescence induction (CFI) is considered. With an example of Triticum aestuvum L. plants grown under continuous illumination at a photon flux density of 600 μmol/(m2 s) photosynthetically active radiation (PAR), the CFI curves were analyzed with leaves of various ages as a function of actinic light intensity. The fluorometer PAM-2100 was applied for measurements of CFI curves. The characteristic peaks of CFI curves in wheat leaves were most conspicuous and had the largest amplitudes at 600–800 μmol/(m2 s) PAR, which corresponds to the middle range of actinic light intensities employed in PAM-2100 fluorometers. In plants exposed to favorable and stressful conditions, the developmental stages may proceed at different rates; thus, the comparison of fluorescence parameters for leaves of equal calendar age but having different physiological states may provide ambiguous data. Therefore, the feasibility of recording CFI curves of different types is quite important for rapid diagnostics of the age and state of plant leaves, as well as for adequate physiological conclusions. © 2016, Pleiades Publishing, Ltd.

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Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50/50, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Shikhov, V. N.; Nesterenko, T. V.; Tikhomirov, A. A.

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