Experimental biology

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ЭКОЛОГО-ФИТОЦЕНОТИЧЕСКАЯ ОЦЕНКА ПОПУЛЯЦИЙ ЭНДЕМИЧНОГО ВИДА TULIPA BRACHYSTEMON REGEL НА СЕВЕРНОМ МАКРОСКЛОНЕ ЖЕТЫСУСКОГО АЛАТАУ
(Al-Farabi Kazakh National University, 2026-09-20)
B. Sh. Kaliyev
;
Liliya A. Dimeyeva
;
Kapar Ussen
;
Ажар Иманалинова
;
Ж.Е. Сагидолдина
Tulipa brachystemon Regel is a narrowly distributed endemic whose occurrence within the Zhetysu Alatau mountains remains insufficiently studied, while information on its phytocoenotic affinity and habitat structure is still fragmentary. Therefore, the study of plant communities with the participation of T. brachystemon and the assessment of its role within the vegetation cover of the northern macroslope of the Zhetysu Alatau mountains are of considerable relevance. The aim of this study was to summarize available data on plant communities with the participation of Tulipa brachystemon on the northern macroslope of the Zhetysu Alatau mountains, to identify the floristic features of these communities and to assess the phytocoenotic affinity of the species. The scientific significance of the study lies in the synthesis of all available information on the composition and diversity of plant communities containing Tulipa brachystemon. The study was based on field investigations conducted between 2015 and 2022, herbarium collections, ...
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БИОХИМИЧЕСКАЯ И МИКРОБИОЛОГИЧЕСКАЯ ОЦЕНКА ARTEMIA PARTHENOGENETICA, ОБОГАЩЁННОЙ ARTHROSPIRA PLATENSIS ZTS-2024
(Al-Farabi Kazakh National University, 2026-09-20)
Damys Salauat
;
Dariga Batayeva
;
Gaukhar Jumakhanova
;
Sofiakhan Alimova
;
Zh. S. Omarova
Live feeds of the genus Artemia are widely used in aquaculture, but their nutritional value and microbiological quality depend on culture conditions and can be improved through biological enrichment. This study evaluated the effect of enriching Artemia parthenogenetica with the Arthrospira platensis ZTS-2024 strain on biochemical characteristics and microbiological quality. The strain, isolated from the southeastern saline area of Lake Balkhash (Jetisu Region, Kazakhstan), was used for 18- and 24-h enrichment. Amino acid and fatty acid compositions, total culturable bacterial counts, Vibrio spp. abundance, and hemolytic bacterial counts were determined. The experiment included three biological replicates, and the data were analyzed by two-way ANOVA followed by Tukey’s test. Enrichment increased several amino acids and polyunsaturated fatty acids, including eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), with the greatest changes after 24 h. At 24 h, total culturable bacteria in the enriched group were 670 ± 430 CFU·individual⁻¹, an 87.1% reduction relative to the corresponding control; hemolytic bacteria decreased by 93.6%, and Vibrio spp. by 90.8%. The study extends evidence on the combined nutritional and microbiological benefits of using a local Arthrospira platensis strain for Artemia enrichment. The practical value of the results lies in the potential use of Arthrospira platensis ZTS-2024 in live-feed preparation for aquaculture.

Experimental biology

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