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Publication Metadata only In silico design of biomass-to-hydrogen Pathways: A review(PERGAMON-ELSEVIER SCIENCE LTD, 2025) Kakimova, Ardak B.; Sadvakasova, Assemgul K.; Kossalbayev, Bekzhan D.; V. Zadneprovskaya, Elena; Xu, Tao; Zaletova, Dilnaz; Allakhverdiev, Suleyman I.; Al-Farabi Kazakh National University; Satbayev University; Satbayev University; Akhmet Yassawi International Kazakh-Turkish University; Timiryazev Institute of Plant Physiology; Russian Academy of Sciences; Xi'an University of Science & Technology; Bahcesehir UniversityHydrogen production from biomass has emerged as a promising renewable energy solution. However, significant challenges such as thermodynamic inefficiencies, high raw material costs, low hydrogen molar yields, and difficulties in using lignocellulosic feedstocks hinder its large-scale implementation. Conventional methods have not been able to effectively address these issues, which makes modern approaches, such as in silico strategies, essential. This review explores the role of computational models like genome-scale metabolic modeling, synthetic biology, and metabolic pathway reconstruction in overcoming these barriers. By utilizing vast genomic databases and advanced computational tools, researchers can optimize microbial systems, improve hydrogen yields, and design more efficient biohydrogen production processes. These in silico methods provide a pathway to enhance the efficiency of biomass processing and enable the development of scalable and sustainable hydrogen production technologies. The review highlights recent advancements and discusses the potential of in silico approaches to address key technological and economic limitations, paving the way for the future of biohydrogen energy.Publication Metadata only Progress and innovation in key technologies for converting biomass to hydrogen(PERGAMON-ELSEVIER SCIENCE LTD, 2025) Kamshybayeva, Gulzhanay K.; Sadvakasova, Asemgul K.; Belkozhayev, Ayaz M.; Kossalbayev, Bekzhan D.; Bauenova, Meruyert O.; Zharmukhamedov, Sergey K.; Hou, Harvey J. M.; Allakhverdiev, Suleyman I.; Al-Farabi Kazakh National University; Satbayev University; Akhmet Yassawi International Kazakh-Turkish University; Chinese Academy of Sciences; Tianjin Institute of Industrial Biotechnology, CAS; Russian Academy of Sciences; Alabama State University; Timiryazev Institute of Plant Physiology; Russian Academy of Sciences; Bahcesehir UniversityThe growing demand for clean energy has spotlighted biomass as a promising resource for sustainable hydrogen production, providing a carbon-neutral alternative to traditional fossil fuels. This review examines the latest advancements in converting biomass to hydrogen, focusing on thermochemical methods like gasification and pyrolysis, catalyst development, and biotechnological approaches such as dark fermentation and biophotolysis. While these methods offer substantial environmental benefits, including waste reduction and renewable energy generation, challenges persist in optimizing feedstock diversity, enhancing catalyst stability, and achieving costeffective scalability. Innovations in plasma-assisted reforming, advanced nanocatalysts, and integrated reactor designs show promise in overcoming these barriers. By fostering collaboration across academia, industry, and government, these advancements can pave the way for a viable, sustainable hydrogen economy and contribute significantly to reducing global carbon emissions.Publication Metadata only Biotechnological production of hydrogen: Design features of photobioreactors and improvement of conditions for cultivating cyanobacteria(PERGAMON-ELSEVIER SCIENCE LTD, 2024) Kossalbayev, Bekzhan D.; Yilmaz, Girayhan; Sadvakasova, Asemgul K.; Zayadan, Bolatkhan K.; Belkozhayev, Ayaz M.; Kamshybayeva, Gulzhanay K.; Sainova, Gaukhar A.; Bozieva, Ayshat M.; Alharby, Hesham F.; Tomo, Tatsuya; Allakhverdiev, Suleyman I.; Satbayev University; Satbayev University; Al-Farabi Kazakh National University; Bahcesehir University; Aitkhozhin Institute of Molecular Biology & Biochemistry; Akhmet Yassawi International Kazakh-Turkish University; Timiryazev Institute of Plant Physiology; Russian Academy of Sciences; King Abdulaziz University; Tokyo University of ScienceOver the last five decades, solar-based hydrogen (H2) production has been intensively studied. Specifically, the study of biophotolysis by cyanobacteria has received great attention to produce H2, and promising research approaches have been established. To date, numerous photobioreactors (PBRs) have been built to collect cyanobacterial biomass and generate bioenergy. Additionally, different PBR parameters were adjusted to increase the product yield. PBR development holds great potential not only for cell biomass but also for biological H2 production. This review aimed to examine the mechanisms involved in H2 production by cyanobacteria, explore the factors influencing the process, and describe five distinct PBRs known for their high H2 production. This article examines the pros and cons of the most efficient PBRs for H2 production and offers insights into strategies for (c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Publication Metadata only Optimising microalgae-derived butanol yield(PERGAMON-ELSEVIER SCIENCE LTD, 2024) Bauenova, Meruyert O.; Sadvakasova, Assemgul K.; Kossalbayev, Bekzhan D.; Yilmaz, Girayhan; Huang, Zhiyong; Wang, Jingjing; Balouch, Huma; Zaletova, Dilnaz E.; Lyaguta, Mariya A.; Alharby, Hesham F.; Allakhverdiev, Suleyman I.; Al-Farabi Kazakh National University; Akhmet Yassawi International Kazakh-Turkish University; Bahcesehir University; Chinese Academy of Sciences; Tianjin Institute of Industrial Biotechnology, CAS; King Abdulaziz University; Timiryazev Institute of Plant Physiology; Russian Academy of SciencesRapid global urbanisation emphasises the necessity to explore sustainable energy resources to fulfill escalating energy demands. Biobutanol emerges as a promising biofuel due to heightened energy density and molecular similarity to petrol. Microalgae, rich in carbohydrates, offer a potential glucose source for biobutanol fermen-tation. The current study shows that varying CO2 concentrations affect carbohydrate content in the biomass of P. kessleri bh-2 and Scenedesmus sp.k-7. The introduction of 1% CO2 significantly improved carbohydrate pro-ductivity, reaching 74.5% for P. kessleri bh-2 and 71.0% for Scenedesmus sp.k-7. Enzymatic hydrolysis was found to be most effective for ABE fermentation, with optimal results obtained at enzyme loads of 8 mg g 1 cellulase and 2 mg g 1 amylase for both strains. When C. acetobutylicum cells were cultivated with pretreated P. kessleri bh-2 biomass, the biobutanol yield amounted to 4.8 gL-1 at a glucose concentration of 5.30 gL-1, demonstrating strain's superior performance compared to Scenedesmus sp.k-7.Publication Metadata only Genetic engineering contribution to developing cyanobacteria-based hydrogen energy to reduce carbon emissions and establish a hydrogen economy(PERGAMON-ELSEVIER SCIENCE LTD, 2024) Kamshybayeva, Gulzhanay K.; Kossalbayev, Bekzhan D.; Sadvakasova, Asemgul K.; Kakimova, Ardak B.; Bauenova, Meruyert O.; Zayadan, Bolatkhan K.; Lan, Chi-Wei; Alwasel, Saleh; Tomo, Tatsuya; Chang, Jo-Shu; Allakhverdiev, Suleyman I.; Al-Farabi Kazakh National University; Satbayev University; Satbayev University; Yuan Ze University; King Saud University; Tokyo University of Science; Tunghai University; Tunghai University; National Cheng Kung University; Russian Academy of Sciences; Timiryazev Institute of Plant Physiology; Russian Academy of Sciences; King Abdulaziz University; Bahcesehir UniversityGrowing concerns over greenhouse gas emissions and energy insecurity caused by the depletion of conventional fuels have led to a search for sustainable fuel alternatives. As an alternative energy carrier, hydrogen (H2) is particularly attractive as only water is released during combustion. The process of H2 production from genetically engineered phototrophic microorganisms through biophotolysis leads the way to solve energy shortages. Genetically engineered cyanobacteria species are potential candidates due to their superior properties for reducing greenhouse gases and using solar energy as an energy source. The review discusses the mechanisms and enzymes involved in H2 production by cyanobacteria and applications of genetic engineering. A critical analysis of the fundamental issues attributed to the technical advancement of photobiological cyanobacteria-based H2 production is provided, as well as the perspectives for future research to reduce carbon dioxide emissions through the creation of waste-free technology. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Publication Metadata only Strategies for genetic modification of microalgae to improve the production efficiency of liquid biofuel(PERGAMON-ELSEVIER SCIENCE LTD, 2025) Kossalbayev, Bekzhan D.; Kakimova, Ardak B.; Sadvakasova, Assemgul K.; Bauenova, Meruyert O.; Balouch, Huma; Zaletova, Maria; Ahmad, Fiaz; Kirbayeva, Dariga K.; Ozgul, Sevim; Allakhverdiev, Suleyman I.; Al-Farabi Kazakh National University; Satbayev University; Akhmet Yassawi International Kazakh-Turkish University; Northwestern Polytechnical University; Bahcesehir University; Russian Academy of Sciences; Timiryazev Institute of Plant PhysiologyThe application of genetic engineering in biofuel production has advanced significantly, driven by developments in genetic tools and omics technologies. These advancements have enhanced our understanding of lipid and carbohydrate metabolism, opening new avenues for metabolic engineering to optimize biofuel production. This review explores genetic strategies to improve the lipid content and fatty acid profiles for biodiesel production, as well as innovations in engineering for one-step biobutanol synthesis using cyanobacteria. Strategies for carbohydrate accumulation are also examined, highlighting their role in biofuel production. Additionally, the review evaluates the environmental risks associated with large-scale fourth-generation biofuel production. The findings emphasize the potential of genetic engineering to transform microalgae into highly efficient biofuel platforms capable of producing biodiesel, biobutanol, and other liquid biofuels. By addressing critical challenges and leveraging cutting-edge technologies, this research contributes to the development of sustainable and economically viable biofuel production systems.Publication Metadata only Effect of the photosynthesis inhibitors on hydrogen production by non-heterocyst cyanobacterial strains(PERGAMON-ELSEVIER SCIENCE LTD, 2024) Kamshybayeva, Gulzhanay K.; Kossalbayev, Bekzhan D.; Sadvakasova, Asemgul K.; Bauenova, Meruyert O.; Zayadan, Bolatkhan K.; Krapivina, Anastasia A.; Sainova, Gaukhar A.; Alharby, Hesham F.; Allakhverdiev, Suleyman I.; Al-Farabi Kazakh National University; Satbayev University; Satbayev University; Russian Academy of Sciences; Timiryazev Institute of Plant Physiology; Akhmet Yassawi International Kazakh-Turkish University; King Abdulaziz University; Russian Academy of Sciences; Bahcesehir UniversityThe energy of cyanobacterial hydrogen (H2) produced via bio-photolysis is being investigated as a potential solution to early-century environmental challenges. The main limiting factors of cyanobacterial H2 photoproduction are the availability of electrons for [NiFe]hydrogenase (H2ase) and the suppression of bidirectional H2ase activity induced by O2 acquired from water molecules splitting in photosystem II. The current study investigated how photosynthetic inhibitors (PIs) affected H2 production in non-N2-fixing cyanobacteria. Study findings revealed a rather high H2 yield in Synechocystis sp. PSU 1262, as well as a beneficial (14.2-fold) influence of 500 mmol KCN on the H2 production by the aforesaid strain. A 12/6-h light/dark cycle increased H2 production by 80.3% in cells supplemented with 500 mmol KCN. Under the optimised conditions, the photobiological H2 production of Synechocystis sp. PSU 1262 increased from 49.6 to 1552 nmol H2 mg-1 Chl a h-1. PIs suppressed chlorophyll a concentration under illumination, lowering the O2 levels, which enhanced bidirectional H2ase activity in Synechocystis sp. PSU 1262 cells. Applying varied light modes, preceded by the incorporation of PIs at optimal concentrations in H2 production by research cyanobacterial strains, improved the H2 yield and contributed signif (c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Publication Metadata only Hydrogen energy development in Turkey: Challenges and opportunities(PERGAMON-ELSEVIER SCIENCE LTD, 2024) Yilmaz, Girayhan; Sadvakasova, Asemgul K.; Kossalbayev, Bekzhan D.; Bauenova, Meruyert O.; Zharmukhamedov, Sergei K.; Ziyayeva, Gulnar K.; Zaletova, Dilnaz E.; Alharby, Hesham F.; Allakhverdiev, Suleyman I.; Bahcesehir University; Al-Farabi Kazakh National University; Akhmet Yassawi International Kazakh-Turkish University; Russian Academy of Sciences; King Abdulaziz University; Russian Academy of Sciences; Timiryazev Institute of Plant PhysiologyIn 2023, the Turkish government set ambitious targets for hydrogen production, aiming to reach a price of $2.40 per kilogram by 2035 and halve it by 2050. This article explores the development potential of hydrogen energy in Turkey based on current data. The analysis encompasses critical elements, such as research and development, governmental hydrogen strategy, economic & energy advantages, production & application technologies. There is also a SWOT analysis of the current hydrogen energy landscape in Turkey. Overcoming various challenges and increasing investments in scientific research and infrastructure development are crucial for the successful expansion of the hydrogen economy. In summary, the development of hydrogen green energy is pivotal for enhancing energy security, reducing environmental impact, and meeting international climate commitments, thus strengthening Turkey's economic position in the global energy arena.Publication Metadata only Prospecting the biofuel potential of new microalgae isolates(PERGAMON-ELSEVIER SCIENCE LTD, 2023) Balouch, Huma; Zayadan, Bolatkhan K.; Sadvakasova, Asemgul K.; Kossalbayev, Bekzhan D.; Bolatkhan, Kenzhegul; Gencer, Donus; Civelek, Dilek; Demirbag, Zihni; Alharby, Hesham F.; Allakhverdiev, Suleyman I.; Al-Farabi Kazakh National University; Satbayev University; Satbayev University; Trabzon University; Karadeniz Technical University; King Abdulaziz University; Russian Academy of Sciences; Timiryazev Institute of Plant Physiology; Bahcesehir UniversityThe continued search and urgent need for renewable fuel sources have necessitated the exploration of microalgae to identify relevant species for making biofuels. The aim of the study was bioprospecting and screening native microalgae strains from freshwater habitats of the Almaty region, Kazakhstan, to assess the potential for producing biofuel. The studied strains demonstrated simultaneous biomass productivity, lipid productivity, suitable fatty acid composition, and biodiesel properties. The sequence analysis of the ribosomal DNA internal transcribed spacer partial region and ribulose-bisphosphate carboxylase gene (rbcL) led to the identification of five microalgae: Monoraphidium griffithii ZBD-01, Nephrochlamys subsolitaria ZBD-02, Ankistrodesmus falcatus ZBD-03, Parachlorella kessleri ZBD-04, and Desmodesmus pannonicus ZBD-05. P. kessleri had the highest biomass production (1.42 +/- 0.08 g L-1 day(-1)), lipid productivity (29 +/- 1.2 g L(-1)day(-1)), and C-16-C-18 fatty acid contents (90%), followed by A. falcatus and M. griffithi. Gas chromatography/mass spectrometry analysis indicated that the dominant fatty acids in these strains were palmitic, stearic, and oleic acids. The calculated biodiesel properties of P. kessleri and A. fal-catus based on fatty acid methyl esters (FAME) profiles showed relatively good fuel properties (cetane numbers -48 and 50, iodine and saponification values -83.4 and 103.6 g I-2/100 g oil, 260.8 and 199.5 mg KOH g(-1)), which correlate well with. Our results suggest that P. kessleri and A. falcatus are promising strains for biodiesel production due to their high lipid productivity, fatty acid profile with relatively high content of oleic acid, and suitable biodiesel properties. The isolated native species of microalgae from natural freshwater bodies of the Almaty region present opportunities for further exploitation for the sustainable production of biomass and biodiesel. (C) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Publication Metadata only Screening and optimisation of hydrogen production by newly isolated nitrogen-fixing cyanobacterial strains(PERGAMON-ELSEVIER SCIENCE LTD, 2023) Kamshybayeva, Gulzhanay K.; Kossalbayev, Bekzhan D.; Sadvakasova, Asemgul K.; Bauenova, Meruyert O.; Zayadan, Bolatkhan K.; Bozieva, Ayshat M.; Alharby, Hesham F.; Tomo, Tatsuya; Allakhverdiev, Suleyman I.; Al-Farabi Kazakh National University; Satbayev University; Satbayev University; Timiryazev Institute of Plant Physiology; Russian Academy of Sciences; King Abdulaziz University; Tokyo University of Science; Bahcesehir UniversityRecently, there has been a propensity to postpone dealing with the world's climate concerns until later, resulting in a 1.5 degrees C rise in temperature over the last century. Therefore, interest in biologically derived, inexhaustible energy sources based on solar energy is growing. Cyanobacteria have the potential to produce clean, renewable fuels in the form of hydrogen (H2) gas, derived from solar energy and water. The current study reports the screening 11 cyanobacterial strains isolated from rice paddies and hotsprings for efficient H2 producers. According to our findings, H2 concentrations in the species ranged from 3.6 to 48.9 mmol mg-1 Chl a h-1. H2 production by isolated species was shown to have a 2% positive influence on oxygen (O2) and carbon dioxide (CO2) concentrations and a 2% negative effect on all nitrogen gas (N2) concentrations. It was discovered that at high CO2 concentrations, photosynthesis is enhanced but H2 production is suppressed. Anabaena variabilis BTA-1047 was found to be the most active H2-producing species, with an H2 production activity of 21.3 mmol mg-1 Chl a h-1. Moreover, a 1% O2: 2% CO2 gas mixture doubled the strain activity of H2 production. The findings of the study called into the question the notion that only an anaerobic environment is required for H2 production by N2-fixing cyanobacterial species and explored whether H2 productivity can be increased by stimulating the micro-anaerobic environment with a carbon source. (c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.