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The efficiency of cationic-based hydrogels in heavy metal removal from wastewater

Bakıt BORKOYEV | Kalıypa SALİYEVA

Article | 2023 | Polymer Bulletin ( Published online: 21 November 2023 )

The present study draws attention to arsenic (V) (As(V)), chromium (III) (Cr(III)), and chromium (VI) (Cr(VI)) heavy metal pollutants, which have negative effects on aquatic ecosystems and indirectly pose a serious threat to the health of living things in the environment. Homopolymer and copolymer hydrogels were synthesized by the UV polymerization technique using 2-acrylamido-2-methyl-1-propansulfonic acid sodium salt (AMPS) and 3-acrlylamidopropil-trimethyl ammonium chloride monomers, and a crosslinker aimed to improve the swelling properties and metal sorption of the prepared hydrogels. The swelling balance values of hydrogels we . . .re determined by the gravimetric method in deionized water and different pH values, and their structural characterizations were carried out by Fourier transform infrared spectroscopy (FT-IR) and thermal gravimetric analysis (TGA) techniques. Sorption efficiencies and sorption capacities of the synthesized hydrogels were determined using aqueous solutions containing As(V), Cr(III), and Cr(VI) heavy metal ions at 25 °C. It was determined that there was a significant increase in p(AMPS) (AM1)-based hydrogel's balance swelling value in deionized water compared to p(AP1) and p(AMPS-co-APTMACl) (AMAP1)-based hydrogels. The lowest equilibrium swelling value was reached in the AMAP1 hydrogel, and the main reason for this result was thought to be due to the closure of the active functional groups of the increased cross-links between AMPS and APTMACl monomer. When sorption results were examined, it was observed that the highest heavy metal ion removal for AM1, AP1, and AMAP1 was in As(V) metal. The highest metal ion holding capacity of AM1, AP1, and AMAP1 was found to be 494 mg/g, 2336 mg/g, and 1439 mg/g for As(V), 323 mg/g, 111 mg/g, and 276 mg/g for Cr(III), and 303 mg/g, 723 mg/g, and 554 mg/g for Cr(VI), respectively. Considering the swelling and sorption results, it is thought that the synthesized hydrogels will provide a significant advantage in the removal of heavy metal ions, which have negative effects on environmental pollution and live health. Keyword: copolymeric hydrogel; heavy metal; homopolymeric; sorption kinetics; sorption mechanis More less

Physio-Chemical Interactions of Manganese Sulfate/Acetate with Amides in Water

Kalıypa SALİYEVA | Bakıt BORKOYEV | Külümkan SARTOVA

Article | 2022 | International Journal of Mechanical Engineering7 ( 2 )

This article is investigating physio-chemical characteristics in manganese sulfate/acetate and amide compounds including thioacetamide, thiocarbamide, thiosemicarbazide in water at 25 °C by isothermal solubility method. System equilibrium was established within 8-10 hours via continuous stirring. For the determination of manganese ion content and nitrogen ions in thiocarbamide, thioacetamide and thiosemicarbazide compounds, trilonometric, Kjeldahl and Duma methods were used.

DETERMINATION OF NUT PROPERTIES AND CHEMICAL COMPOSITIONS OF WALNUT (JUGLANS REGIA L.) GENOTYPES GROWN IN WALNUT-FRUIT FORESTS OF KYRGYZSTAN

Ali Osman SOLAK | Kalıypa SALİYEVA | İbrahim İlker ÖZYİĞİT | Bakıt BORKOYEV

Article | 2020 | Fresenius Environmental Bulletin29 ( 4A )

In this study, sixteen genotypes selected from walnut-fruit forests in the Osh and Jalal-Abad regions of Kyrgyzstan evaluated for nut properties and chemical composition. The nut traits such as nut dimension, nut and kernel weight, kernel ratio, and shell thickness were investigated. The ash, protein, oil, carbohydrate content and fatty acid composition of genotypes were also evaluated. The ranges of average nut characteristics determined for the selected genotypes were: 27.4-32.1 mm nut length; 23.8-28.6 mm nut width; 24.1-29.0 mm nut suture; 7.15-13.17 g nut weight; 3.26-5.65 g kernel weight; 35.02-46.15% kernel percentage and 1.1 . . .3-2.23 mm shell thickness. The oil content of the genotypes ranged from 55.47 to 65.26%, the protein content ranged from 16.59 to 19.97%, and the carbohydrate content was between 14.02% and 22.85%. The ash content ranged from 1.67 to 2.23%, and the moisture content of the kernels was between 2.06 and 2,58%. The oleic acid content of the oils ranged from 18.62 to 32.19%. The linoleic acid content ranged from 46.13 to 62.25%, while linolenic acid content ranged from 6.67 to 13.05%. The palmitic acid content was between 4.98 and 7.67%. Sary-Chelek 1, Arslanbap 3, Arslanbap 4 and Kara-Alma 3 genotypes were identified as the promising genotypes according to nut characteristics and chemical composition More less

Investigation of changes in chemical composition and rheological properties of Kyrgyz rice cultivars (Ozgon rice) depending on long-term stack-storage after harvesting

Camilya SMANALİYEVA | Kalıypa SALİYEVA | Bakıt BORKOYEV

Article | 2015 | LWT - Food Science and Technology63 ( 1 )

The present work investigated the effect of long-term stack-storage after harvesting on selected chemical and rheological properties of Kyrgyz rice cultivars, Ozgon. The performance indicators of in stack-stored Ozgon rice samples after 4, 6, and 12 days was grain size, grain weight, color, moisture, total starch, amylose, protein, fat and ash contents, and mineral composition as well as the rheological properties of rice flour dough. The change of stored rice is caused by the organic modification of the starch structure, decreasing of moisture as well as proteolysis of proteins in the endosperm. The increase of fat and ash contents . . ., mineral composition, and bio-functional components such as γ-oryzanol indicated the diffusion of micro- and macronutrients from rice bran into the rice endosperm and, thus improvement of the nutritional value of the rice flour. These changes in chemical composition directly influence the physical properties, such as pasting and viscoelastic properties of the rice flour dough as well as the browning of the rice grain. - Keywords: Ozgon rice; Stack-storage; Rice flour; Chemical composition; Rheological propertie More less

Heavy Metal Levels and Mineral Nutrient Status of Natural Walnut (Juglans regia L.) Populations in Kyrgyzstan: Nutritional Values of Kernels

Bakıt BORKOYEV | Kalıypa SALİYEVA | Ali Osman SOLAK | İbrahim İlker ÖZYİĞİT

Article | 2019 | Biological Trace Element Research189 ( 1 )

In this study, mineral nutrient and heavy metal (Al, Ca, Cd, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn) contents of the walnut kernels and their co-located soil samples collected from the four different zones of natural walnut forests (Sary-Chelek, Arslanbap, and Kara-Alma in Jalal-Abad Region and Kara-Shoro in Osh Region) in Kyrgyzstan were investigated. The highest concentrations for all elements determined in the soil samples were observed in the Sary-Chelek zone whereas the Arslanbap zone was found to be having the lowest concentrations except Fe and Zn. The highest concentrations in the kernels of walnut samples were found to be in . . . the Sary-Chelek zone for Ca, Fe, K, Mg, and Zn; in the Kara-Shoro zone for Cu; in the Arslanbap zone for Mn; and in the Kara-Alma zone for Na whereas the lowest concentrations were found to be in the Arslanbap zone for Ca, Fe, K, Mg, Na, and Zn and in the Sary-Chelek zone for Cu and Mn, respectively. Also, the levels of Al, Cd, Ni, and Pb in kernel samples could not be detected by ICP-OES because their levels were lower than the threshold detection point (10 μg.kg−1). Additionally, our data indicated that the walnut kernels from Kyrgyzstan have higher values for RDA (recommended daily allowances) in comparison with the walnut kernels from other countrie More less

Kyrgyz learners' and teachers' experiences and perceptions related to ICT use in high school courses

Bakıt BORKOYEV | Kalıypa SALİYEVA | Gülşat MUHAMETJANOVA

Article | 2020 | Education and Information Technologies25 ( 6 )

The increasing use of ICT in education results in advantages for teaching and learning processes. In countries, especially in developing ones, it is essential to examine stakeholders' experiences and perceptions about ICT use in the courses. In this regard, this study firstly aims to investigate ICT use of Kyrgyz learners and teachers. Secondly, the study aims to examine learners' and teachers' perceptions with regard to ICT use in Science, Technology, Engineering, and Mathematics (STEM) courses in high schools in the Kyrgyz Republic. In the context of the study, two different questionnaires were applied. The first questionnaire was . . . applied to high school learners, and the second questionnaire was applied to high school teachers. Participants of the study are 470 learners, and 162 STEM teachers. The results revealed frequencies of Internet and video use, the devices learners employ for Internet access, and online applications they prefer to use. Learners' perceptions of ICT use in STEM courses differ according to their grade levels, type of preparation for the course, and willingness to use online Kyrgyz language resources. The results also explored the difficulties that teachers experience in the courses, the course materials they use, and their expectations related to ICT use in the courses. The crucial problems of Kyrgyz teachers are lack of ICT based materials, lack of equipment, and lack of training More less

Исследование отходов хлопчатника (Gossypium) с целью получения активных углей

Külümkan SARTOVA | Bakıt BORKOYEV | Kalıypa SALİYEVA

Article | 2016 | Проблемы современной науки и образования54 ( 12 )

В статье рассматривается вопрос получения активных углей (АУ) из отходов хлопчатника (Gossypium) путем пиролиза биомассы хлопчатника при 500-800оС. Исследованы химико-технологические свойства продуктов, образующихся в процессе пиролиза. Изучены сорбционные свойства полученных карбонизатов.- Ключевые слова: отходы хлопчатника, карбонизация, адсорбционная способность, cotton wastes, carbonization, adsorptivity . . . More less

An ethnoveterinary study of wild medicinal plants used by the Kyrgyz farmers

Nurbek ALDAYAROV | Askarbek TÜLÖBAEV | Ruslan SALIKOV | Carkınay CUMABEKOVA | Bermet KIDIRALİYEVA | Nurcamal ÖMÜRZAKOVA | Gülbübü KURMANBEKOVA | Nazgül İMANBERDİYEVA | Bircan USUBALİYEV | Bakıt BORKOYEV | Kalıypa SALİYEVA | Kadırbay ÇEKİROV

Article | 2022 | Journal of Ethnopharmacology285

Ethnopharmacological relevance: In their centuries-old nomadic life, since their livestock was the backbone of their lives, the Kyrgyz people used a variety of wild medicinal plants for ethnoveterinary practices. However, the plants used for the treatment of livestock ailments never have been recorded, except rarely in local publications. In this study, we present the HSHR (homemade single species herbal remedy reports), their methods of preparation and application, and the livestock ailments for which these remedies were used.Aims: The collect data from the five different high-altitude valleys of the Kyrgyz Republic on common HSHR . . .used for the treatment of the livestock ailments and describe their preparation procedure, administration, and target animal species.Materials and methods: The plant species mentioned for ethnoveterinary use were collected from five different high-altitude valleys (pastures) in the Kyrgyz Republic during 2016 and 2018. Data were gathered with the help of dialog partners (experienced local shepherds, farmers and veterinarians) through semi-structured interviews. In total, 166 dialog partners were interviewed. The special characteristics of HSHR mentioned for ethnoveterinary use and practices were documented. Plant samples and voucher specimens were collected for taxonomic identification, and preserved for future reference.Results: A total of 2388 HSHR referred to 66 plant species mentioned for ethnoveterinary use belonging to 27 families and 49 genera. According to the data, species of the family Asteraceae were most frequently used HSHRs in the Kyrgyz ethnoveterinary practice (599 HSHR, 25), followed by Polygonaceae (166 HSHR, 7), Lamiaceae (141 HSHR, 6), Ranunculaceae (121 HSHR, 5), Nitrariaceae (119 HSHR, 4.9), Apiaceae (113 HSHR, 4.7), Cupressaceae (111 HSHR, 4.6), Urticaceae (100 HSHR, 4.2), Gentianaceae (92 HSHR, 3.8), Amaranthaceae (87 HSHR, 3.6). A total of 2785 UR (use reports) were collected for the 2388 HSHR. Infection diseases (572 UR, 20.5), parasitic diseases (531 UR, 19), gastrointestinal disorders (523 UR, 18.77) and wounds (522 UR, 18.74) were almost evenly reported indications. The largest number use reports (UR) were for cattle (967 UR, 34.7) and horses (919 UR, 33), followed by 607 UR (21.8) for sheep and 292 UR (10.48) for other domestic animals, including dogs (106 UR, 3.8), goats (103 UR, 3.69) and donkeys (83 UR, 2.98).Conclusion: In this study, we identified the folk ethnoveterinary knowledge of the HSHR used by the Kyrgyz farmers in their daily veterinary practice. All the characterized HSHR are of value to the local animal breeders. This knowledge has previously been limited to local shepherds, farmers and vets. Many of these need scientific confirmation using modern methods of phytochemistry and pharmacology More less

ПЕРСПЕКТИВНЫЕ МЕТОДЫ СОХРАНЕНИЯ КАЧЕСТВ ЯДЕР ОРЕХА (JUGLANS REGIA) ПРИ ХРАНЕНИИ

Kalıypa SALİYEVA | Bakıt BORKOYEV

Article | 2020 | Успехи современного естествознания ( 12 )

Масло грецкого ореха пользуется большим спросом из-за высокой пищевой ценности. Однако оно легко окисляется и часто теряет свой типичный аромат. Воздействие кислорода, света, влаги и высокой температуры приводит к окислению жирных кислот и, как было установлено, является основным источником привкуса и снижения качества грецких орехов. Целью данной работы было оценить эффективность различных методов для сохранения качества ядер грецких орехов при хранении. В этом обзоре были изучены самые последние исследования, опубликованные за последние десять лет. В обзорной статье проводится анализ исследований по сохранению качества ореха при х . . .ранении различными методами: ультразвуковая экстракция, охлаждение с использованием антиоксидантных консервантов и съедобных покрытий, упаковка в модифицированной атмосфере, комбинированные методы консервации, сублимационная сушка, термообработка, обжарка. Химический состав, жирные кислоты, ненасыщенные жирные кислоты (олеиновая, пальмитолеиновая, линолевая и линоленовая кислоты), антиоксидантные компоненты (токоферолы и фитостеролы), общее содержание флавоноидов (TFC), общее содержание полифенолов (TPC), белки и минералы грецких орехов были исследованы после сублимационной сушки и в процессе тепловой сушки. Были проанализированы химические параметры, связанные с повреждением при хранении: пероксидное число (PV), конъюгированные диены (CD, сопряженные триены (CT) и cодержание каротиноидов (CC). Также были проанализированы летучие соединения, связанные с окислением липидов, такие как нонаналь, гексаналь, бутаналь и (E) -2-гептеналь, которые увеличились во всех образцах во время хранения. В заключение рассматриваются перспективы и задачи исследований на будущее, а также даются рекомендации по сохранению качеств ореха во время хранения More less

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