Global warming caused by the emission of CO_(2) in industrial flue gas has attractedmore and more attention.Therefore,to fix CO_(2) with high efficiency and environmentally friendly had become the hot research field.C...Global warming caused by the emission of CO_(2) in industrial flue gas has attractedmore and more attention.Therefore,to fix CO_(2) with high efficiency and environmentally friendly had become the hot research field.Compared with the traditional coal-fired power plant flue gas emission reduction technology,carbon fixation and emission reduction by microalgae is considered as a promising technology due to the advantages of simple process equipment,convenient operation and environmental protection.When the flue gas is treated by microalgae carbon fixation and emission reduction technology,microalgae cells can fix CO_(2) in the flue gas through photosynthesis,and simultaneously absorb NO_(x) and SO_(x) as nitrogen and sulfur sources required for growth.Meanwhile,they can also absorb mercury,selenium,arsenic,cadmium,lead and other heavy metal ions in the flue gas to obtain microalgae biomass.The obtained microalgae biomass can be further transformed into high valueadded products,which has broad development prospects.This paper reviews the mechanisms and pathways of CO_(2) sequestration,the mechanism and impacts of microalgal emission reduction of flue gas pollutants,and the applications of carbon sequestration in industrial flue gas by microalgae.Finally,this paper provides some guidelines and prospects for the research and application of green emission reduction technology for industrial flue gas.展开更多
A comparison of culture biomass evolution for the microalgae Scenedesmus spinosus in a tubular pilot photobioreactor of 1.6 m^(3)and a raceway pilot photobioreactor of 1.2 m^(3)was carried out,using a nutritional Z-8 ...A comparison of culture biomass evolution for the microalgae Scenedesmus spinosus in a tubular pilot photobioreactor of 1.6 m^(3)and a raceway pilot photobioreactor of 1.2 m^(3)was carried out,using a nutritional Z-8 medium with the injection of carbon dioxide,and using an electronic system for monitoring and control of operational variables.For three weeks of testing,each culture was exposed to three pH levels of 6.5,7.0 or 7.5,where random samples from both bioreactors were taken three times a week,to analyze pH,turbidity,transmittance at 640 nm and temperature.At the beginning and the end of culture,total solids were analyzed,and photographs were taken with a microscope to study the cell conditions of culture.This study revealed that the highest biomass production of Scenedesmus spinosus was obtained at pH 6.5 in the raceway photobioreactor,with a productivity of 371 g m^(-3) day^(-1),0.78%total solids,a turbidity of 858 NTU and 5%transmittance at the end of the culture.展开更多
The use of microalgae to recover nitrogen and phosphorus from wastewater has garnered significant attention,positioning it as one of the most promising and sustainable strategies in modern wastewater treatment.While v...The use of microalgae to recover nitrogen and phosphorus from wastewater has garnered significant attention,positioning it as one of the most promising and sustainable strategies in modern wastewater treatment.While various photobioreactors(PBRs)configurations have been widely applied for microalgae cultivation,limited research has focused on optimizing PBR design specificallyto enhance nitrogen and phosphorus removal efficiency.The high operational costs of wastewater treatment,combined with the inherent variability of microalgal growth,have prompted the search for advanced solutions that improve nitrogen and phosphorus removal while minimizing resource consumption and enabling predictive process control.Recently,the integration of PBR systems with artificialintelligence and machine learning(AI/ML)modeling has emerged as a transformative approach to enhancing nutrient removal,particularly for nitrogen and phosphorus.This study firstsummarizes existing PBR designs tailored for diverse applications,then outlines strategies for system enhancement through the optimization of mixing methods,construction materials,light intensity,and light source configuration.Furthermore,computational fluiddynamics(CFD)and AI/ML modeling are presented as tools to guide the structural design and operational optimization of microalgae-based nitrogen and phosphorus removal processes.Finally,future research directions and key challenges are discussed.展开更多
Microalgae-bacteria system is an emerging alternative for sustainable wastewater treatment.Exploring the structure and diversity of microbial community in microalgae-bacteria system under sulfadiazine stress can contr...Microalgae-bacteria system is an emerging alternative for sustainable wastewater treatment.Exploring the structure and diversity of microbial community in microalgae-bacteria system under sulfadiazine stress can contribute to the understanding of the sulfadiazine behavior in environments.Furthermore,as important carriers of antibiotic resistance genes(ARGs),microalgae can influence the profiles of ARGs either directly or indirectly through the secretion of metabolites.However,the effects of sulfadiazine on ARGs dissemination of microalgae-bacteria systems remain underreported.Herein,the impacts of sulfadiazine(1 mg/L)on the structural diversity and metabolic activity of microorganisms were examined in microalgae-bacteria systems.Results showed thatmicroalgae-bacteria system could remove NH_(4)^(+)-N better(about 72.3%)than activated sludge system,and hydrolysis was the first step in sulfadiazine degradation.A high level of intI1(5.7×10^(4) copies/mL)was detected in the initial media of the microalgae-bacteria system.Microalgae could hamper the rate of horizontal gene transfer activation.Compared with activated sludge system,the abundance of sul genes(sul1,sul2,sul3,and sulA)was significantly lowered after treating with microalgae-bacteria system.Additionally,the number of proteins and the sum of polysaccharides in the extracellular polymeric substances of the activated sludge system were lower than those of themicroalgae-bacteria system.Microalgae can altermicrobial communities.The genus Rozellomycota predominated all samples.Fungi with relatively high abundance increased in the microalgae-bacteria system,including Dipodascaceae,Rhodotorula,and Geotrichum.These results offer valuable insights into the application processes involving microalgae-bacteria system.展开更多
Gastrointestinal tract toxicity represents a serious adverse effect of chemotherapy,leading to reduced quality of life and survival.For instance,irinotecan(CPT-11)usually causes severe gastrointestinal toxicity,with a...Gastrointestinal tract toxicity represents a serious adverse effect of chemotherapy,leading to reduced quality of life and survival.For instance,irinotecan(CPT-11)usually causes severe gastrointestinal toxicity,with a lack of effective therapeutic interventions,making treatment often unsustainable.Therefore,development of an effective and safe therapy is crucial for improving chemotherapy efficacy and the patients’quality of life.In this work,we developed a novel approach involving the helical-shaped cyanobacterium microalgae,Spirulina platensis(SP),to carry the bornyl acetate(BA)-loaded chitosan nanoparticles to enhance drug retention in the small intestine.We demonstrated the protection effect of BA against chemotherapy-induced intestinal injury using an epithelial cell model.In a mouse model,orally administered BA-ChNPs@SP accumulated in the small intestine and attenuated inflammation by reducing dsDNA release and oxidative stress.This was concomitant with the restoration of the intestinal barrier and modulation of the immune microenvironment.This work suggests the promise of the microalgae-carrying nanomedicine strategy for treatment of intestinal diseases,emphasizing its potential in addressing chemotherapy-induced gastrointestinal complications.展开更多
Polar microalgae are microscopic organisms adapted to survive in cold and extreme habitats such as sea-ice,glaciers,lakes and snow.These microorganisms provide an essential basis as primary food sources in polar ecosy...Polar microalgae are microscopic organisms adapted to survive in cold and extreme habitats such as sea-ice,glaciers,lakes and snow.These microorganisms provide an essential basis as primary food sources in polar ecosystems.Despite their ecological importance,polar microalgae remain relatively unexplored compared to their tropical and temperate counterparts,largely due to the practical challenges of obtaining and maintaining material from the harsh polar environments.However,interest has recently surged due to their specific adaptations and potential for utilization in various fields.This review explores the survival strategies of polar microalgae and their commercial applications in healthcare and other fields.We also consider the processes involved in processing polar microalgae,from cultivation to extraction of bioactive compounds.Our findings highlight a growing need for research in this rapidly evolving field to unlock the potential of polar microalgae in multiple fields.展开更多
Melanosomes are specialized membrane-bound organelles within which melanin is synthesized and stored.The levels of melanin can be effectively reduced by inhibiting melanin synthesis or promoting melanosome degradation...Melanosomes are specialized membrane-bound organelles within which melanin is synthesized and stored.The levels of melanin can be effectively reduced by inhibiting melanin synthesis or promoting melanosome degradation via autophagy.Ceramide,a central molecule in sphingolipid metabolism,has been widely implicated in the regulation of autophagy.Few researchers have addressed the potential effects of ceramide analogs on suppressing melanin synthesis.However,whether ceramide can induce melanosome autophagy and the potential autophagy-dependent mechanism underlying this phenomenon remain unknown.Here,an active compound from the marine microalgae Emiliania huxleyi extract was firstly isolated and identified as a long-chain C22-ceramide(C22-Cer).In vitro results of mouse B16 melanoma cell experiments showed that treatment with 2-5µmol/L C22-Cer significantly suppressed the increase ofα-MSH-induced melanin levels and tyrosinase activity without cytotoxicity.C22-Cer induced typical hallmarks of autophagy such as accumulation of autophagosomes,enhanced autophagic flux and microtubule-associated protein light chain 3,LC3-II expression,and p62 degradation through activating c-Jun N-terminal kinase(JNK)directly.Furthermore,C22-Cer activated JNK-Bcl-2 signaling,dissociated the Beclin1/Bcl-2 complex,and induced melanosome autophagy without affecting the expression of MITF.Besides,the Ca^(2+)influx induced by treatment with C22-Cer further increased the substantial accumulation of autophagosomes.Together,we found a novel marine-derived compound,C22-Cer,targeting JNK pathway and Ca^(2+)signaling to induce melanosome autophagy and suppress melanin accumulation in B16 cells.This study implicates that C22-Cer might be a potential therapeutic mediator against skin pigmentation in mammals.展开更多
In order to realize the detection and analysis of microalgae in sediment samples with complex scenes, the project takes advantage of the character of microalgae that they can auto-fluoresce when exposed to the illumin...In order to realize the detection and analysis of microalgae in sediment samples with complex scenes, the project takes advantage of the character of microalgae that they can auto-fluoresce when exposed to the illumination of certain exciation waves. The project takes grey-scale and fluorescent pictures of microalgae in the same field of view and uses the image processing technique to deal with the images, such as threshold segmentation, contour and texture analysis and pattern recognition. The results show that the fluorescent image can effectively elimate the yawp in the complex background and make the consequent image processing more effective and easy. Then the project comes to the conclusion that fluorescence-assisted image processing can realize the detection and analysis of microalgae in sediment samples containing complex scenes.展开更多
Hydrophilic and lipophilic extracts were prepared from 8 microalgal strains, and screened for antimicrobial and antitumor activities. Antimicrobial activity was determined by observing bacterial （ S. aureus, Bacillus...Hydrophilic and lipophilic extracts were prepared from 8 microalgal strains, and screened for antimicrobial and antitumor activities. Antimicrobial activity was determined by observing bacterial （ S. aureus, Bacillus subtilis and Escherichia coh~ and fungal（Aspergillus niger and Penicillium chrysogenum） growth inhibition. All the microalgae had different degrees of antimicrobial activity against one or more microbe - tested, and 56.47% of the extracts showing the anti-S.aureus activity exhibited the antibacterial activity against （MRSA）. Cytotoxic activities were measured in vitro against human cancer cell lines HeLa by the MTT assay. Most of these extracts showed potent activity against the growth of the tumor cells, especially the intracellular lipophilic extracts from Isochrysis galbana Parke 3011 and Isochrysis galbana Parke H29, which exhibited strong antitumor activity against HeLa cell lines. The overall results of this study indicate that the extracts from microalgae represent a potential sources of medicine for the treatment of infectious and cancer diseases.展开更多
基金supported by the National Key R&D Program of China(No.2023YFC3709500).
文摘Global warming caused by the emission of CO_(2) in industrial flue gas has attractedmore and more attention.Therefore,to fix CO_(2) with high efficiency and environmentally friendly had become the hot research field.Compared with the traditional coal-fired power plant flue gas emission reduction technology,carbon fixation and emission reduction by microalgae is considered as a promising technology due to the advantages of simple process equipment,convenient operation and environmental protection.When the flue gas is treated by microalgae carbon fixation and emission reduction technology,microalgae cells can fix CO_(2) in the flue gas through photosynthesis,and simultaneously absorb NO_(x) and SO_(x) as nitrogen and sulfur sources required for growth.Meanwhile,they can also absorb mercury,selenium,arsenic,cadmium,lead and other heavy metal ions in the flue gas to obtain microalgae biomass.The obtained microalgae biomass can be further transformed into high valueadded products,which has broad development prospects.This paper reviews the mechanisms and pathways of CO_(2) sequestration,the mechanism and impacts of microalgal emission reduction of flue gas pollutants,and the applications of carbon sequestration in industrial flue gas by microalgae.Finally,this paper provides some guidelines and prospects for the research and application of green emission reduction technology for industrial flue gas.
文摘A comparison of culture biomass evolution for the microalgae Scenedesmus spinosus in a tubular pilot photobioreactor of 1.6 m^(3)and a raceway pilot photobioreactor of 1.2 m^(3)was carried out,using a nutritional Z-8 medium with the injection of carbon dioxide,and using an electronic system for monitoring and control of operational variables.For three weeks of testing,each culture was exposed to three pH levels of 6.5,7.0 or 7.5,where random samples from both bioreactors were taken three times a week,to analyze pH,turbidity,transmittance at 640 nm and temperature.At the beginning and the end of culture,total solids were analyzed,and photographs were taken with a microscope to study the cell conditions of culture.This study revealed that the highest biomass production of Scenedesmus spinosus was obtained at pH 6.5 in the raceway photobioreactor,with a productivity of 371 g m^(-3) day^(-1),0.78%total solids,a turbidity of 858 NTU and 5%transmittance at the end of the culture.
基金supported by the National Natural Science Foundation of China(22038012,U24A20543)the Science and Technology Pro-gram of Fujian Province,China(2025Y4001).
文摘The use of microalgae to recover nitrogen and phosphorus from wastewater has garnered significant attention,positioning it as one of the most promising and sustainable strategies in modern wastewater treatment.While various photobioreactors(PBRs)configurations have been widely applied for microalgae cultivation,limited research has focused on optimizing PBR design specificallyto enhance nitrogen and phosphorus removal efficiency.The high operational costs of wastewater treatment,combined with the inherent variability of microalgal growth,have prompted the search for advanced solutions that improve nitrogen and phosphorus removal while minimizing resource consumption and enabling predictive process control.Recently,the integration of PBR systems with artificialintelligence and machine learning(AI/ML)modeling has emerged as a transformative approach to enhancing nutrient removal,particularly for nitrogen and phosphorus.This study firstsummarizes existing PBR designs tailored for diverse applications,then outlines strategies for system enhancement through the optimization of mixing methods,construction materials,light intensity,and light source configuration.Furthermore,computational fluiddynamics(CFD)and AI/ML modeling are presented as tools to guide the structural design and operational optimization of microalgae-based nitrogen and phosphorus removal processes.Finally,future research directions and key challenges are discussed.
基金supported by the Key Research Program of Wuhan(No.2022022202015015)the State Key Laboratory of Urban Water Resource and Environment(Harbin Institute of Technology)(No.2022TS13)+1 种基金the key projects of National Natural Science Foundation of China(No.2019YFC0408503)Shanghai Tongji Gao Tingyao Environmental Technology Development Foundation.
文摘Microalgae-bacteria system is an emerging alternative for sustainable wastewater treatment.Exploring the structure and diversity of microbial community in microalgae-bacteria system under sulfadiazine stress can contribute to the understanding of the sulfadiazine behavior in environments.Furthermore,as important carriers of antibiotic resistance genes(ARGs),microalgae can influence the profiles of ARGs either directly or indirectly through the secretion of metabolites.However,the effects of sulfadiazine on ARGs dissemination of microalgae-bacteria systems remain underreported.Herein,the impacts of sulfadiazine(1 mg/L)on the structural diversity and metabolic activity of microorganisms were examined in microalgae-bacteria systems.Results showed thatmicroalgae-bacteria system could remove NH_(4)^(+)-N better(about 72.3%)than activated sludge system,and hydrolysis was the first step in sulfadiazine degradation.A high level of intI1(5.7×10^(4) copies/mL)was detected in the initial media of the microalgae-bacteria system.Microalgae could hamper the rate of horizontal gene transfer activation.Compared with activated sludge system,the abundance of sul genes(sul1,sul2,sul3,and sulA)was significantly lowered after treating with microalgae-bacteria system.Additionally,the number of proteins and the sum of polysaccharides in the extracellular polymeric substances of the activated sludge system were lower than those of themicroalgae-bacteria system.Microalgae can altermicrobial communities.The genus Rozellomycota predominated all samples.Fungi with relatively high abundance increased in the microalgae-bacteria system,including Dipodascaceae,Rhodotorula,and Geotrichum.These results offer valuable insights into the application processes involving microalgae-bacteria system.
基金the National Key Research and Development Program of China(2022YFE0203600,China)NFSC(81925035,82341232)+2 种基金Program of Shanghai Committee of Science and Technology(21ZR1475200,China)Department of Science and Technology of Guangdong Province(High-Level R&D and Innovative Research Institute 2021B0909050003)SciTech Projects of Zhongshan(CXTD2022011,LJ2021001).
文摘Gastrointestinal tract toxicity represents a serious adverse effect of chemotherapy,leading to reduced quality of life and survival.For instance,irinotecan(CPT-11)usually causes severe gastrointestinal toxicity,with a lack of effective therapeutic interventions,making treatment often unsustainable.Therefore,development of an effective and safe therapy is crucial for improving chemotherapy efficacy and the patients’quality of life.In this work,we developed a novel approach involving the helical-shaped cyanobacterium microalgae,Spirulina platensis(SP),to carry the bornyl acetate(BA)-loaded chitosan nanoparticles to enhance drug retention in the small intestine.We demonstrated the protection effect of BA against chemotherapy-induced intestinal injury using an epithelial cell model.In a mouse model,orally administered BA-ChNPs@SP accumulated in the small intestine and attenuated inflammation by reducing dsDNA release and oxidative stress.This was concomitant with the restoration of the intestinal barrier and modulation of the immune microenvironment.This work suggests the promise of the microalgae-carrying nanomedicine strategy for treatment of intestinal diseases,emphasizing its potential in addressing chemotherapy-induced gastrointestinal complications.
基金supported by the Sultan Mizan Antarctic Research Foundation Smart Partnership(YPASM)Initiative“Photoprotective Potential of Mycosporine-Like Amino Acids(MAAs)and Bioactive Compounds from Antarctic Microalgae on Human Keratinocytes”(Grant number:IMU R 289/2023)。
文摘Polar microalgae are microscopic organisms adapted to survive in cold and extreme habitats such as sea-ice,glaciers,lakes and snow.These microorganisms provide an essential basis as primary food sources in polar ecosystems.Despite their ecological importance,polar microalgae remain relatively unexplored compared to their tropical and temperate counterparts,largely due to the practical challenges of obtaining and maintaining material from the harsh polar environments.However,interest has recently surged due to their specific adaptations and potential for utilization in various fields.This review explores the survival strategies of polar microalgae and their commercial applications in healthcare and other fields.We also consider the processes involved in processing polar microalgae,from cultivation to extraction of bioactive compounds.Our findings highlight a growing need for research in this rapidly evolving field to unlock the potential of polar microalgae in multiple fields.
基金supported by the National Natural Science Foundation of China(Nos.42076086 and 32202068)Fujian Province Natural Science Foundation of China(Nos.2019J01696 and 2022J01332)the Fujian Province Young and Middle-Aged Teacher Education Research Project(No.JAT200247).
文摘Melanosomes are specialized membrane-bound organelles within which melanin is synthesized and stored.The levels of melanin can be effectively reduced by inhibiting melanin synthesis or promoting melanosome degradation via autophagy.Ceramide,a central molecule in sphingolipid metabolism,has been widely implicated in the regulation of autophagy.Few researchers have addressed the potential effects of ceramide analogs on suppressing melanin synthesis.However,whether ceramide can induce melanosome autophagy and the potential autophagy-dependent mechanism underlying this phenomenon remain unknown.Here,an active compound from the marine microalgae Emiliania huxleyi extract was firstly isolated and identified as a long-chain C22-ceramide(C22-Cer).In vitro results of mouse B16 melanoma cell experiments showed that treatment with 2-5µmol/L C22-Cer significantly suppressed the increase ofα-MSH-induced melanin levels and tyrosinase activity without cytotoxicity.C22-Cer induced typical hallmarks of autophagy such as accumulation of autophagosomes,enhanced autophagic flux and microtubule-associated protein light chain 3,LC3-II expression,and p62 degradation through activating c-Jun N-terminal kinase(JNK)directly.Furthermore,C22-Cer activated JNK-Bcl-2 signaling,dissociated the Beclin1/Bcl-2 complex,and induced melanosome autophagy without affecting the expression of MITF.Besides,the Ca^(2+)influx induced by treatment with C22-Cer further increased the substantial accumulation of autophagosomes.Together,we found a novel marine-derived compound,C22-Cer,targeting JNK pathway and Ca^(2+)signaling to induce melanosome autophagy and suppress melanin accumulation in B16 cells.This study implicates that C22-Cer might be a potential therapeutic mediator against skin pigmentation in mammals.
文摘In order to realize the detection and analysis of microalgae in sediment samples with complex scenes, the project takes advantage of the character of microalgae that they can auto-fluoresce when exposed to the illumination of certain exciation waves. The project takes grey-scale and fluorescent pictures of microalgae in the same field of view and uses the image processing technique to deal with the images, such as threshold segmentation, contour and texture analysis and pattern recognition. The results show that the fluorescent image can effectively elimate the yawp in the complex background and make the consequent image processing more effective and easy. Then the project comes to the conclusion that fluorescence-assisted image processing can realize the detection and analysis of microalgae in sediment samples containing complex scenes.
基金supported by the Natural Science Foundation of Tianjin (Grant No. 08JCZDJC16600)We also would like to thank Key Development Programs of Tianjin in Science and Technology (Grant No. 06YFGZNC04200)
文摘Hydrophilic and lipophilic extracts were prepared from 8 microalgal strains, and screened for antimicrobial and antitumor activities. Antimicrobial activity was determined by observing bacterial （ S. aureus, Bacillus subtilis and Escherichia coh~ and fungal（Aspergillus niger and Penicillium chrysogenum） growth inhibition. All the microalgae had different degrees of antimicrobial activity against one or more microbe - tested, and 56.47% of the extracts showing the anti-S.aureus activity exhibited the antibacterial activity against （MRSA）. Cytotoxic activities were measured in vitro against human cancer cell lines HeLa by the MTT assay. Most of these extracts showed potent activity against the growth of the tumor cells, especially the intracellular lipophilic extracts from Isochrysis galbana Parke 3011 and Isochrysis galbana Parke H29, which exhibited strong antitumor activity against HeLa cell lines. The overall results of this study indicate that the extracts from microalgae represent a potential sources of medicine for the treatment of infectious and cancer diseases.
