Publications by authors named "Jin-Ho Yun"

Pathogen-derived nuclear localization signals (NLSs) enable vigorous nuclear invasion in the host by the virulence proteins harboring them. Herein, inspired by the robust nuclear import mechanism, we show that NLSs originating from the plant infection-associated proteins VirD2 and VirE2 can be incorporated into the Cas9 system as efficient nuclear delivery enhancers, thereby improving the low gene-editing frequency in a model microalga, , caused by poor nuclear localization of the bulky nuclease. Prior to evaluation of the NLSs, IPA1 (Cre04.

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Endosymbionts are important for insect species as they provide essential substances to the host. Due to the technical advance of NGS technology and assemblers, many endosymbionts bacterial genomes are available now. Here, we analysed fourteen endosymbiont bacterial genomes of genius, one of notorious pest species.

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Background: Microalgae have emerged as sustainable alternatives to fossil fuels and high-value petrochemicals. Despite the commercial potential of microalgae, their low biomass productivity is a significant limiting factor for large-scale production. In the photoautotrophic cultivation of microalgae, achievable cell density levels depend on the light transmittance of the production system, which can significantly decrease the photosynthetic rate and biomass production.

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  • * Optimal cultivation conditions have been determined through high-throughput screening, finding that fructose as a carbon source significantly increases ARA production and microalgal growth.
  • * Under the best conditions (30 g/L fructose and 27°C), the amounts of biomass and ARA produced showed remarkable increases, demonstrating the effectiveness of these optimized methods in enhancing production efficiency.
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  • The study focuses on enhancing the productivity of Scenedesmus deserticola for commercial production of loliolide through long-term acclimation using glucose as an organic carbon source.
  • After a year of acclimation, a specific strain (S. deserticola HS4) showed at least a 2-fold increase in loliolide production and underwent further testing in larger cultivation setups.
  • The findings indicate that long-term acclimation can significantly improve the productivity and adaptability of microalgae, making them more viable for industrial applications.
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A halotolerant consortium between microalgae and methanotrophic bacteria could effectively remediate in situ CH and CO, particularly using saline wastewater sources. Herein, Methylomicrobium alcaliphilum 20Z was demonstrated to form a mutualistic association with Chlorella sp. HS2 at a salinity level above 3.

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Incorporation of wastewater from industrial sectors into the design of microalgal biorefineries has significant potential for advancing the practical application of this emerging industry. This study tested various food industrial wastewaters to assess their suitability for microalgal cultivation. Among these wastewaters, defective soy sauce (DSS) and soy sauce wastewater (SWW) were chosen but DSS exhibited the highest nutrient content with 13,500 ppm total nitrogen and 3051 ppm total phosphorus.

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Herein, different extracts of JD052, a green microalga, were evaluated in vitro as a potential anti-aging bioagent. Although post-treatment of microalgal culture with either UV irradiation or high light illumination did not lead to a substantial difference in the effectiveness of microalgal extracts as a potential anti-UV agent, the results indicated the presence of a highly potent compound in ethyl acetate extract with more than 20% increase in the cellular viability of normal human dermal fibroblasts (nHDFs) compared with the negative control amended with DMSO. The subsequent fractionation of the ethyl acetate extract led to two bioactive fractions with high anti-UV property; one of the fractions was further separated down to a single compound.

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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.

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Article Synopsis
  • Microalgae have been researched for 70 years, but biodiesel has struggled due to low competitiveness and global trends against internal combustion engines.
  • Interest in reducing CO emissions has increased as global warming disasters become more frequent.
  • New strategies include developing drop-in fuels for aviation and maritime, stable outdoor cultivation for CO sequestration, and integrated refining processes for multiple product outputs, positioning the microalgal industry as vital for a future bio-based economy.
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Fructophilic behavior in microalgae is a rare trait that could benefit biorefineries by enabling substitution of carbon source with fructose, and our previous study identified that Ettlia sp. prefers fructose relative to glucose. In this study, by analyzing the transcription levels of genes related to sugar transport and the glycolysis pathway, the fructose utilization of Ettlia sp.

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Background: Nannochloropsis is a marine microalga that has been extensively studied. The major carotenoid produced by this group of microalgae is violaxanthin, which exhibits anti-inflammatory, anti-photoaging, and antiproliferative activities. Therefore, it has a wide range of potential applications.

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Biodegradable films based on chitosan, glycerol, and defatted Chlorella biomass (DCB) were prepared and characterized in terms of thermal stability, mechanical, water barrier, and optical properties. Increasing DCB content from 5 to 25 wt% increased tensile strength of chitosan films by 235%. The incorporation of DCB decreased both moisture content and swelling degree of chitosan/defatted Chlorella biomass (Cs/DCB) films.

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Herein, a two-stage cultivation process was devised to overcome low pigment content of algal biomass grown in heterotrophy. Post-treatment conditions (i.e.

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Human decision-making that involves moral dilemmas is a complex process, as individuals try to adhere to their moral values while their actual decisions can be influenced by several situational constraints. When facing a moral conflict that can bring a gain or loss for a decision-maker but a corresponding loss or gain for others, the decision-maker's choice of resolution strategy lies in its relating to gain-loss asymmetry by placing greater utility weight on his or her immediate gains and delayed losses. Although many neuroimaging studies have unveiled the neural mechanisms that underlie moral decision-making, little attention has been paid to the temporal dynamics of how a decision-maker assesses utility weights differently for a moral (or adaptive) choice that will bring loss (or gain) to himself (and others) when the outcome will be realized in the near versus distant future.

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  • The study explored a new method to boost carotenoid production by manipulating the interaction between autophagy and carotenoid biosynthesis in Chlamydomonas reinhardtii.
  • Silencing the ATG1 and ATG8 genes using artificial microRNA significantly reduced their expression, resulting in a 2.34-fold increase in β-carotene content.
  • Additionally, the modified strains showed enhanced biodiesel properties due to higher levels of beneficial fatty acids, highlighting the potential economic benefits for algal biorefinery.
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Open algal cultivation platforms often suffer crop losses to herbivorous grazers that have potential to devastate biomass production within a few days. While a number of studies suggest synthetic chemicals as control agents for voracious algal grazers, environmental and safety concerns associated with the use of these chemicals encourage the exploration of alternative biological control agents. We hereby propose the application of a biosurfactant produced by Bacillus subtilis C9 (referred to as C9-biosurfactant) for controlling cladoceran grazers commonly found in algal cultivation systems.

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  • Researchers are exploring how environmental stress, like high salinity, can boost lipid accumulation in algal cells, potentially improving algal oil production for industrial use.
  • The study found that the microalga Chlorella sorokiniana HS1 showed significant lipid accumulation when subjected to high salinity and supplemented with bicarbonate, maintaining cell integrity.
  • A successful two-phase cultivation process was demonstrated, resulting in a 12% increase in lipid content while also indicating a carbon reallocation inside the cells, which enhances the understanding of algal growth under stress conditions.
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A flexible hybrid anode from graphite and thin film silicon is realized by the concept of a 3D sandwich current collector by the combination of micro-contact printing and RF magnetron sputtering. Flexible lithium-ion batteries with a new hybrid anode demonstrate not only enhanced specific capacity but also improved rate capability compared to that of a conventional graphite anode under bending deformation.

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The progressive deposition of amyloid-β (Aβ) in the brain is a pathologic feature of Alzheimer's disease (AD). This study was aimed to determine whether endogenous tissue plasminogen activator (tPA) modulates the pathogenic process of AD. tPA expression and activity developed around amyloid plaques in the brains of human amyloid precursor protein-overexpressing Tg2576 mice, which were weakened by the genetic ablation of tPA.

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A Polymeric mirror from 1D photonic crystal exhibiting full specular reflection is applied on the exterior of the counter electrode of a dye-sensitized solar cells (DSSCs). Reflection of exiting light from the cell allows for the reuse of the light and thereby significantly increases the efficiency of the DSSCs (from 8.07% to 8.

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