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Article ; Online: The emerging potential of natural and synthetic algae-based microbiomes for heavy metal removal and recovery from wastewaters.

Greeshma, Kozhumal / Kim, Hee-Sik / Ramanan, Rishiram

2022 Volume 215, Issue Pt 1, Page(s) 114238

Abstract: Heavy Metal (HM) bioremoval by microbes is a successful, environment-friendly technique, particularly at low concentrations of HMs. Studies using algae, bacteria, and fungi reveal promising capabilities in isolation and when used in consortia. Yet, few ... ...

Abstract	Heavy Metal (HM) bioremoval by microbes is a successful, environment-friendly technique, particularly at low concentrations of HMs. Studies using algae, bacteria, and fungi reveal promising capabilities in isolation and when used in consortia. Yet, few reviews have emphasized individual and collective HM removal rates and the associated mechanisms in natural or synthetic microbiomes. Besides discussing the limitations of conventional and synthetic biology approaches, this review underscores the utility of indigenous microbial taxon, i.e., algae, fungi, and bacteria, in HM removal with adsorption capacities and their synergistic role in microbiome-led studies. The detoxification mechanisms studied for certain HMs indicate distinctive removal pathways in each taxon which points to an enhanced effect when used as a microbiome. The role and higher efficacies of the designer microbiomes with complementing and mutualistic taxa are also considered, followed by recovery options for a circular bioeconomy. The citation network analysis further validates the multi-metal removal ability of microbiomes and the restricted capabilities of the individual counterparts. In precis, the study reemphasizes increased metal removal efficiencies of inter-taxon microbiomes and the mechanisms for synergistic and improved removal, eventually drawing attention to the benefits of ecological engineering approaches compared to other alternatives.
MeSH term(s)	Bacteria/metabolism ; Biodegradation, Environmental ; Fungi ; Metals, Heavy/analysis ; Microbiota ; Plants/metabolism ; Wastewater/analysis
Chemical Substances	Metals, Heavy ; Waste Water
Language	English
Publishing date	2022-09-13
Publishing country	Netherlands
Document type	Journal Article ; Review ; Research Support, Non-U.S. Gov't
ZDB-ID	205699-9
ISSN	1096-0953 ; 0013-9351
ISSN (online)	1096-0953
ISSN	0013-9351
DOI	10.1016/j.envres.2022.114238
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Article: The emerging potential of natural and synthetic algae-based microbiomes for heavy metal removal and recovery from wastewaters

Greeshma, Kozhumal / Kim, Hee-Sik / Ramanan, Rishiram

Environmental research. 2022 Dec., v. 215

2022

Abstract	Heavy Metal (HM) bioremoval by microbes is a successful, environment-friendly technique, particularly at low concentrations of HMs. Studies using algae, bacteria, and fungi reveal promising capabilities in isolation and when used in consortia. Yet, few reviews have emphasized individual and collective HM removal rates and the associated mechanisms in natural or synthetic microbiomes. Besides discussing the limitations of conventional and synthetic biology approaches, this review underscores the utility of indigenous microbial taxon, i.e., algae, fungi, and bacteria, in HM removal with adsorption capacities and their synergistic role in microbiome-led studies. The detoxification mechanisms studied for certain HMs indicate distinctive removal pathways in each taxon which points to an enhanced effect when used as a microbiome. The role and higher efficacies of the designer microbiomes with complementing and mutualistic taxa are also considered, followed by recovery options for a circular bioeconomy. The citation network analysis further validates the multi-metal removal ability of microbiomes and the restricted capabilities of the individual counterparts. In precis, the study reemphasizes increased metal removal efficiencies of inter-taxon microbiomes and the mechanisms for synergistic and improved removal, eventually drawing attention to the benefits of ecological engineering approaches compared to other alternatives.
Keywords	adsorption ; bioeconomics ; heavy metals ; microbiome ; research ; synthetic biology ; wastewater
Language	English
Dates of publication	2022-12
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	205699-9
ISSN	1096-0953 ; 0013-9351
ISSN (online)	1096-0953
ISSN	0013-9351
DOI	10.1016/j.envres.2022.114238
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Extra benefit of microalgae in raw piggery wastewater treatment: pathogen reduction.

Lee, Sang-Ah / Kim, Minsik / Kim, Hee-Sik / Ahn, Chi-Yong

Microbiome

2022 Volume 10, Issue 1, Page(s) 142

Abstract: Background: Monitoring microbial communities especially focused on pathogens in newly developed wastewater treatment systems is recommended for public health. Thus, we investigated the microbial community shift in a pilot-scale microalgal treatment ... ...

Abstract	Background: Monitoring microbial communities especially focused on pathogens in newly developed wastewater treatment systems is recommended for public health. Thus, we investigated the microbial community shift in a pilot-scale microalgal treatment system for piggery wastewater. Results: Microalgae showed reasonable removal efficiencies for COD and ammonia, resulting in higher transparency of the final effluent. Metagenome and microbial diversity analyses showed that heterotrophic microalgal cultivation barely changed the bacterial community; however, the mixotrophic microalgal cultivation induced a sudden change. In addition, an evaluation of risk groups (RGs) of bacteria showed that raw piggery wastewater included abundant pathogens, and the microalgal treatment of the raw piggery wastewater decreased the RG2 pathogens by 63%. However, co-cultivation of microalgae and the most dominant RG2 pathogen, Oligella, showed no direct effects between them. Conclusions: Thus, a microbial interaction network was constructed to elucidate algae-bacteria interrelationships, and the decrease in Oligella was indirectly connected with microalgal growth via Brevundimonas, Sphingopyxis, and Stenotrophomonas. In a validation test, 3 among 4 connecting bacterial strains exhibited inhibition zones against Oligella. Therefore, we showed that microalgal wastewater treatment causes a decrease in RG2 bacteria, which is an indirect impact of microalgae associated with bacteria. Video abstract.
MeSH term(s)	Biomass ; Microalgae ; Nitrogen ; Waste Water ; Water Purification
Chemical Substances	Waste Water ; Nitrogen (N762921K75)
Language	English
Publishing date	2022-08-31
Publishing country	England
Document type	Journal Article ; Video-Audio Media ; Research Support, Non-U.S. Gov't
ZDB-ID	2697425-3
ISSN	2049-2618 ; 2049-2618
ISSN (online)	2049-2618
ISSN	2049-2618
DOI	10.1186/s40168-022-01339-3
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Unlocking synergies: Harnessing the potential of biological methane sequestration through metabolic coupling between Methylomicrobium alcaliphilum 20Z and Chlorella sp. HS2.

Yun, Jin-Ho / Lee, Hyewon / Nam, Jang-Won / Ko, Minji / Park, Jaehyun / Lee, Dae-Hee / Lee, Seung-Goo / Kim, Hee-Sik

Bioresource technology

2024 Volume 399, Page(s) 130607

Abstract: A halotolerant consortium between microalgae and methanotrophic bacteria could effectively remediate in situ ... ...

Abstract	A halotolerant consortium between microalgae and methanotrophic bacteria could effectively remediate in situ CH
MeSH term(s)	Methane/metabolism ; Chlorella/metabolism ; Methylococcaceae/metabolism ; Bacteria/metabolism
Chemical Substances	Methane (OP0UW79H66)
Language	English
Publishing date	2024-03-17
Publishing country	England
Document type	Journal Article
ZDB-ID	1065195-0
ISSN	1873-2976 ; 0960-8524
ISSN (online)	1873-2976
ISSN	0960-8524
DOI	10.1016/j.biortech.2024.130607
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Article ; Online: 7S,15R-Dihydroxy-16S,17S-epoxy-docosapentaenoic Acid Overcomes Chemoresistance of 5-Fluorouracil by Suppressing the Infiltration of Tumor-Associated Macrophages and Inhibiting the Activation of Cancer Stem Cells in a Colorectal Cancer Xenograft Model

Su, Yan / Choi, Hack Sun / Choi, Jong Hyun / Kim, Hee Sik / Jang, Yong Suk / Seo, Jeong-Woo

Mar Drugs. 2023 Jan. 24, v. 21, no. 2

2023

Abstract: Although the tumor bulk is initially reduced by 5-fluorouracil (5-FU), chemoresistance developed due to prolonged chemotherapy in colorectal cancer (CRC). The enrichment of cancer stem cells (CSCs) and the infiltration of tumor-associated macrophages ( ... ...

Abstract	Although the tumor bulk is initially reduced by 5-fluorouracil (5-FU), chemoresistance developed due to prolonged chemotherapy in colorectal cancer (CRC). The enrichment of cancer stem cells (CSCs) and the infiltration of tumor-associated macrophages (TAMs) contribute to chemoresistance and poor outcomes. A docosahexaenoic acid derivative developed by our group, 7S,15R-dihydroxy-16S,17S-epoxy-docosapentaenoic acid (diHEP-DPA), exerts antitumor effects against TAMs infiltration and CSCs enrichment in our previous study. The current study aimed to investigate whether diHEP-DPA was able to overcome chemoresistance to 5-FU in CRCs, together with the potential synergistic mechanisms in a CT26-BALB/c mouse model. Our results suggested that although 5-FU inhibited tumor growth, 5-FU enriched CSCs via the WNT/β-catenin signaling pathway, resulting in chemoresistance in CRCs. However, we revealed that 5-FU promoted the infiltration of TAMs via the NF-kB signaling pathway and improved epithelial–mesenchymal transition (EMT) via the signal transducer and activator of the transcription 3 (STAT3) signaling pathway; these traits were believed to contribute to CSC activation. Furthermore, supplementation with diHEP-DPA could overcome drug resistance by decreasing the CSCs, suppressing the infiltration of TAMs, and inhibiting EMT progression. Additionally, the combinatorial treatment of diHEP-DPA and 5-FU effectively enhanced phagocytosis by blocking the CD47/signal regulatory protein alpha (SIRPα) axis. These findings present that diHEP-DPA is a potential therapeutic supplement to improve drug outcomes and suppress chemoresistance associated with the current 5-FU-based therapies for colorectal cancer.
Keywords	colorectal neoplasms ; docosahexaenoic acid ; drug resistance ; drug therapy ; fluorouracil ; macrophages ; mice ; models ; phagocytosis ; regulatory proteins ; signal transduction ; xenotransplantation
Language	English
Dates of publication	2023-0124
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article ; Online
ZDB-ID	2175190-0
ISSN	1660-3397
ISSN	1660-3397
DOI	10.3390/md21020080
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Identification of Loliolide with Anti-Aging Properties from

Cho, Dae-Hyun / Yun, Jin-Ho / Heo, Jina / Lee, In-Kyoung / Lee, Yong-Jae / Bae, Seunghee / Yun, Bong-Sik / Kim, Hee-Sik

Journal of microbiology and biotechnology

2023 Volume 33, Issue 9, Page(s) 1250–1256

Abstract: Herein, different extracts ... ...

Abstract	Herein, different extracts of
MeSH term(s)	Humans ; Scenedesmus ; Acetates ; Aging ; Microalgae/chemistry
Chemical Substances	ethyl acetate (76845O8NMZ) ; loliolide (U3BB4IM281) ; Acetates
Language	English
Publishing date	2023-06-02
Publishing country	Korea (South)
Document type	Journal Article
ZDB-ID	2412195-2
ISSN	1738-8872 ; 1738-8872
ISSN (online)	1738-8872
ISSN	1738-8872
DOI	10.4014/jmb.2304.04044
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Article ; Online: 7

Su, Yan / Choi, Hack Sun / Choi, Jong Hyun / Kim, Hee-Sik / Jang, Yong-Suk / Seo, Jeong-Woo

Marine drugs

2023 Volume 21, Issue 2

Abstract	Although the tumor bulk is initially reduced by 5-fluorouracil (5-FU), chemoresistance developed due to prolonged chemotherapy in colorectal cancer (CRC). The enrichment of cancer stem cells (CSCs) and the infiltration of tumor-associated macrophages (TAMs) contribute to chemoresistance and poor outcomes. A docosahexaenoic acid derivative developed by our group, 7
MeSH term(s)	Mice ; Animals ; Humans ; Fluorouracil/pharmacology ; Drug Resistance, Neoplasm ; Tumor-Associated Macrophages/metabolism ; Tumor-Associated Macrophages/pathology ; Heterografts ; Cell Line, Tumor ; Colorectal Neoplasms/drug therapy ; Wnt Signaling Pathway ; Neoplastic Stem Cells
Chemical Substances	Fluorouracil (U3P01618RT) ; diHEP-DPA
Language	English
Publishing date	2023-01-24
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2175190-0
ISSN	1660-3397 ; 1660-3397
ISSN (online)	1660-3397
ISSN	1660-3397
DOI	10.3390/md21020080
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Article: Sedimentation and Rheological Study of Microalgal Cell (Chlorella sp. HS2) Suspension

Hong, Joung Sook / Shin, Wonsik / Nam, Hyorin / Yun, Jin-Ho / Kim, Hee-Sik / Ahn, Kyung Hyun

Biotechnology and bioprocess engineering. 2022 June, v. 27, no. 3

2022

Abstract: Microalgae (Chlorella sp. HS2) have a high potential as a new biomass filler resource. Microalgae suspension is investigated depending on pH condition, focusing on microscopic sedimentation and a rheological behavior in order to understand in-depth the ... ...

Abstract	Microalgae (Chlorella sp. HS2) have a high potential as a new biomass filler resource. Microalgae suspension is investigated depending on pH condition, focusing on microscopic sedimentation and a rheological behavior in order to understand in-depth the behavior of Chlorella sp. HS2 for harvesting process design. In terms of sedimentation analysis, it is found that Chlorella sp. HS2 cells settle down due to high density of 1.56 gcm⁻³. Meanwhile due to its small size and dilute concentration, the settling velocity is too slow for harvesting by natural sedimentation. Chlorella sp. HS2 cells undergo weak aggregation in the medium depending on pH condition. When the Chlorella sp. HS2 suspension (pH 5.4) is adjusted at pH 2.5, the surfaces of the microalgal cells turn neutral and cells are aggregated by van der Waals force between cells, leading to relatively faster sedimentation compared to Chlorella sp. HS2 cells without pH adjustment. The aggregation of Chlorella sp. HS2 cells depending on pH condition is reflected in rheological properties of the suspension. At pH 2.5, shear viscosity of the Chlorella sp. HS2 suspension increases and the suspension shows shear thinning behavior, meaning that the neutralized surface of Chlorella sp. HS2 makes cells aggregation. However, the aggregation of microalgal HS2 cells is easily dissociated and aligned along shear flow. Therefore, for the successful harvesting of biomass Chlorella sp. HS2, the flow and colloidal condition must be considered along with coagulation for rapid harvesting of cells.
Keywords	Chlorella ; biomass ; bioprocessing ; biotechnology ; coagulation ; microalgae ; neutralization ; pH ; process design ; van der Waals forces ; viscosity
Language	English
Dates of publication	2022-06
Size	p. 451-460.
Publishing place	The Korean Society for Biotechnology and Bioengineering
Document type	Article
ZDB-ID	2125481-3
ISSN	1976-3816 ; 1226-8372
ISSN (online)	1976-3816
ISSN	1226-8372
DOI	10.1007/s12257-021-0275-y
Database	NAL-Catalogue (AGRICOLA)

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Article: Algal biopolymers as sustainable resources for a net-zero carbon bioeconomy

Aswathi Mohan, A. / Robert Antony, Aiswarya / Greeshma, Kozhumal / Yun, Jin-Ho / Ramanan, Rishiram / Kim, Hee-Sik

Bioresource technology. 2022 Jan., v. 344

2022

Abstract: The era for eco-friendly polymers was ushered by the marine plastic menace and with the discovery of emerging pollutants such as micro-, nano-plastics, and plastic leachates from fossil fuel-based polymers. This review investigates algae-derived natural, ...

Abstract	The era for eco-friendly polymers was ushered by the marine plastic menace and with the discovery of emerging pollutants such as micro-, nano-plastics, and plastic leachates from fossil fuel-based polymers. This review investigates algae-derived natural, carbon neutral polysaccharides and polyesters, their structure, biosynthetic mechanisms, biopolymers and biocomposites production process, followed by biodegradability of the polymers. The review proposes acceleration of research in this promising area to address the need for eco-friendly polymers and to increase the cost-effectiveness of algal biorefineries by coupling biofuel, high-value products, and biopolymer production using waste and wastewater-grown algal biomass. Such a strategy improves overall sustainability by lowering costs and carbon emissions in algal biorefineries, eventually contributing towards the much touted circular, net-zero carbon future economies. Finally, this review analyses the evolution of citation networks, which in turn highlight the emergence of a new frontier of sustainable polymers from algae.
Keywords	algae ; biocomposites ; biodegradability ; bioeconomics ; biofuels ; biomass ; biopolymers ; biorefining ; biosynthesis ; carbon ; cost effectiveness ; evolution ; fossil fuels ; polysaccharides ; wastes
Language	English
Dates of publication	2022-01
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	1065195-0
ISSN	1873-2976 ; 0960-8524
ISSN (online)	1873-2976
ISSN	0960-8524
DOI	10.1016/j.biortech.2021.126397
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: How do freshwater microalgae and cyanobacteria respond to antibiotics?

Le, Ve Van / Tran, Quynh-Giao / Ko, So-Ra / Lee, Sang-Ah / Oh, Hee-Mock / Kim, Hee Sik / Ahn, Chi-Yong

Critical Reviews in Biotechnology. 2023 Feb. 17, v. 43, no. 2 p.191-211

2023

Abstract: Antibiotic pollution is an emerging environmental challenge. Residual antibiotics from various sources, including municipal and industrial wastewater, sewage discharges, and agricultural runoff, are continuously released into freshwater environments, ... ...

Abstract	Antibiotic pollution is an emerging environmental challenge. Residual antibiotics from various sources, including municipal and industrial wastewater, sewage discharges, and agricultural runoff, are continuously released into freshwater environments, turning them into reservoirs that contribute to the development and spread of antibiotic resistance. Thus, it is essential to understand the impacts of antibiotic residues on aquatic organisms, especially microalgae and cyanobacteria, due to their crucial roles as primary producers in the ecosystem. This review summarizes the effects of antibiotics on major biological processes in freshwater microalgae and cyanobacteria, including photosynthesis, oxidative stress, and the metabolism of macromolecules. Their adaptive mechanisms to antibiotics exposure, such as biodegradation, bioadsorption, and bioaccumulation, are also discussed. Moreover, this review highlights the important factors affecting the antibiotic removal pathways by these organisms, which will promote the use of microalgae-based technology for the removal of antibiotics. Finally, we offer some perspectives on the opportunities for further studies and applications.
Keywords	Cyanobacteria ; agricultural runoff ; antibiotic resistance ; antibiotics ; bioaccumulation ; biodegradation ; biotechnology ; ecosystems ; freshwater ; industrial wastewater ; microalgae ; oxidative stress ; photosynthesis ; pollution ; sewage ; antibiotic ; freshwater ecosystem ; adaptation ; non-targeted microorganisms
Language	English
Dates of publication	2023-0217
Size	p. 191-211.
Publishing place	Taylor & Francis
Document type	Article ; Online
ZDB-ID	1042364-3
ISSN	1549-7801 ; 0738-8551
ISSN (online)	1549-7801
ISSN	0738-8551
DOI	10.1080/07388551.2022.2026870
Database	NAL-Catalogue (AGRICOLA)

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