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Article ; Online: Onggi's permeability to carbon dioxide accelerates kimchi fermentation.

Kim, Soohwan / Hu, David L

2023 Volume 20, Issue 201, Page(s) 20230034

Abstract: Since ancient times, Korean chefs have fermented foods in an onggi, a traditional earthenware vessel. The porous structure of the onggi mimics the loose soil where lactic acid bacteria is naturally found. This permeability has been purported to ... ...

Abstract	Since ancient times, Korean chefs have fermented foods in an onggi, a traditional earthenware vessel. The porous structure of the onggi mimics the loose soil where lactic acid bacteria is naturally found. This permeability has been purported to facilitate the growth of lactic acid bacteria, but the details of the process remain poorly understood. In this combined experimental and theoretical study, we ferment salted napa cabbage in onggi and hermetic glassware and measure the time course of carbon dioxide concentration, which is a signature of fermentation. We present a mathematical model for carbon dioxide generation rate during fermentation using the onggi's gas permeability as a free parameter. Our model provides a good fit for the data, and we conclude that porous walls help the onggi to 'exhale' carbon dioxide, lowering internal levels to those favoured by lactic acid bacteria. The positive pressure inside the onggi and the constant outflow through its walls act as a safety valve for bacteria growth by blocking the entry of external contaminants without mechanical components. We hope this study draws attention to the work of traditional artisans and inspires energy-efficient methods for fermenting and storing food products.
MeSH term(s)	Fermentation ; Carbon Dioxide ; Lactobacillales ; Permeability ; Fermented Foods/microbiology
Chemical Substances	Carbon Dioxide (142M471B3J)
Language	English
Publishing date	2023-04-05
Publishing country	England
Document type	Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	2156283-0
ISSN	1742-5662 ; 1742-5689
ISSN (online)	1742-5662
ISSN	1742-5689
DOI	10.1098/rsif.2023.0034
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Tailored Solvation and Interface Structures by Tetrahydrofuran-Derived Electrolyte Facilitates Ultralow Temperature Lithium Metal Battery Operations.

Kim, Soohwan / Pol, Vilas G

ChemSusChem

2023 Volume 16, Issue 5, Page(s) e202202143

Abstract: Ineffectiveness of Li-ion batteries (LIBs) in cold climates hinders electronics to work in various conditions including frigid environments, despite high demands. Given that intrinsic properties of LIB materials cause this problem, optimized cell ... ...

Abstract	Ineffectiveness of Li-ion batteries (LIBs) in cold climates hinders electronics to work in various conditions including frigid environments, despite high demands. Given that intrinsic properties of LIB materials cause this problem, optimized cell chemistries ultimately are required for low-temperature usage. In this study, Li-metal batteries (LMBs) composed of a Li-metal anode (LMA) stabilized by a localized high-concentration electrolyte (LHCE) are found to significantly enhance low-temperature performance. The LHCE allows the LMA to have compact and regular deposition and excellent plating/stripping efficiency at sub-zero temperatures. The LHCE produces an inorganic-rich solid-electrolyte interphase with larger amounts of Li
Language	English
Publishing date	2023-01-05
Publishing country	Germany
Document type	Journal Article
ISSN	1864-564X
ISSN (online)	1864-564X
DOI	10.1002/cssc.202202143
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Article ; Online: Serping1 associated with α-synuclein increase in colonic smooth muscles of MPTP-induced Parkinson's disease mice.

Seo, Min Hyung / Kim, Soo-Hwan / Yeo, Sujung

Scientific reports

2024 Volume 14, Issue 1, Page(s) 1140

Abstract: Patients with Parkinson's disease (PD) have gastrointestinal motility disorders, which are common non-motor symptoms. However, the reasons for these motility disorders remain unclear. Increased alpha-synuclein (α-syn) is considered an important factor in ...

Abstract	Patients with Parkinson's disease (PD) have gastrointestinal motility disorders, which are common non-motor symptoms. However, the reasons for these motility disorders remain unclear. Increased alpha-synuclein (α-syn) is considered an important factor in peristalsis dysfunction in colonic smooth muscles in patients with PD. In this study, the morphological changes and association between serping1 and α-syn were investigated in the colon of the 1-methyl 4-phenyl 1,2,3,6-tetrahydropyridine-induced chronic PD model. Increased serping1 and α-syn were noted in the colon of the PD model, and decreased serping1 also induced a decrease in α-syn in C2C12 cells. Serping1 is a major regulator of physiological processes in the kallikrein-kinin system, controlling processes including inflammation and vasodilation. The kinin system also comprises bradykinin and bradykinin receptor 1. The factors related to the kallikrein-kinin system, bradykinin, and bradykinin receptor 1 were regulated by serping1 in C2C12 cells. The expression levels of bradykinin and bradykinin receptor 1, modulated by serping1 also increased in the colon of the PD model. These results suggest that the regulation of increased serping1 could alleviate Lewy-type α-synucleinopathy, a characteristic of PD. Furthermore, this study could have a positive effect on the early stages of PD progression because of the perception that α-syn in colonic tissues is present prior to the development of PD motor symptoms.
MeSH term(s)	Animals ; Humans ; Mice ; 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine ; alpha-Synuclein/metabolism ; Bradykinin/pharmacology ; Complement C1 Inhibitor Protein ; Disease Models, Animal ; Gastrointestinal Diseases ; Mice, Inbred C57BL ; Parkinson Disease ; Receptors, Bradykinin
Chemical Substances	1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine (9P21XSP91P) ; alpha-Synuclein ; Bradykinin (S8TIM42R2W) ; Complement C1 Inhibitor Protein ; Receptors, Bradykinin ; Serping1 protein, mouse ; Snca protein, mouse
Language	English
Publishing date	2024-01-11
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-024-51770-9
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Article ; Online: Efficient Clustering for Continuous Occupancy Mapping Using a Mixture of Gaussian Processes.

Kim, Soohwan / Kim, Jonghyuk

Sensors (Basel, Switzerland)

2022 Volume 22, Issue 18

Abstract: This paper proposes a novel method for occupancy map building using a mixture of Gaussian processes. Gaussian processes have proven to be highly flexible and accurate for a robotic occupancy mapping problem, yet the high computational complexity has been ...

Abstract	This paper proposes a novel method for occupancy map building using a mixture of Gaussian processes. Gaussian processes have proven to be highly flexible and accurate for a robotic occupancy mapping problem, yet the high computational complexity has been a critical barrier for large-scale applications. We consider clustering the data into small, manageable subsets and applying a mixture of Gaussian processes. One of the problems in clustering is that the number of groups is not known a priori, thus requiring inputs from experts. We propose two efficient clustering methods utilizing (1) a Dirichlet process and (2) geometrical information in the context of occupancy mapping. We will show that the Dirichlet process-based clustering can significantly speed up the training step of the Gaussian process and if geometrical features, such as line features, are available, they can further improve the clustering accuracy. We will provide simulation results, analyze the performance and demonstrate the benefits of the proposed methods.
Language	English
Publishing date	2022-09-09
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2052857-7
ISSN	1424-8220 ; 1424-8220
ISSN (online)	1424-8220
ISSN	1424-8220
DOI	10.3390/s22186832
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Article ; Online: Dynamics of macroscopic diffusion across meta-populations with top-down and bottom-up approaches: A review.

Kim, Minkyoung / Kim, Soohwan

Mathematical biosciences and engineering : MBE

2022 Volume 19, Issue 5, Page(s) 4610–4626

Abstract: Human interaction patterns on the Web over online social networks vary with the context of communication items (e.g., politics, economics, disasters, celebrities, and etc.), which leads to form unlimited time-evolving curves of information adoption as ... ...

Abstract	Human interaction patterns on the Web over online social networks vary with the context of communication items (e.g., politics, economics, disasters, celebrities, and etc.), which leads to form unlimited time-evolving curves of information adoption as diffusion proceeds. Online communications often continue to navigate through heterogeneous social systems consisting of a wide range of online media such as social networking sites, blogs, and mainstream news. This makes it very challenging to uncover the underlying causal mechanisms of such macroscopic diffusion. In this respect, we review both top-down and bottom-up approaches to understand the underlying dynamics of an individual item's popularity growth across multiple meta-populations in a complementary way. For a case study, we use a dataset consisting of time-series adopters for over 60 news topics through different online communication channels on the Web. In order to find disparate patterns of macroscopic information propagation, we first generate and cluster the diffusion curves for each target meta-population and then estimate them with two different and complementary approaches in terms of the strength and directionality of influences across the meta-populations. In terms of the strength of influence, we find that synchronous global diffusion is not possible without very strong intra-influence on each population. In terms of the directionality of influence between populations, such concurrent propagation is likely brought by transitive relations among heterogeneous populations. When it comes to social context, controversial news topics in politics and human culture (e.g., political protests, multiculturalism failure) tend to trigger more synchronous than asynchronous diffusion patterns across different social media on the Web. We expect that this study can help to understand dynamics of macroscopic diffusion across complex systems in diverse application domains.
MeSH term(s)	Communication ; Diffusion ; Humans ; Politics ; Social Media ; Social Networking
Language	English
Publishing date	2022-04-16
Publishing country	United States
Document type	Journal Article ; Review ; Research Support, Non-U.S. Gov't
ZDB-ID	2265126-3
ISSN	1551-0018 ; 1551-0018
ISSN (online)	1551-0018
ISSN	1551-0018
DOI	10.3934/mbe.2022213
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Article ; Online: Inactivation of Foodborne Pathogen Biofilm Cells Using a Combination Treatment with Gaseous Chlorine Dioxide and Aerosolized Sanitizers.

Kim, Se-Yeon / Kim, Soo-Hwan / Park, Sang-Hyun

Journal of food protection

2023 Volume 86, Issue 7, Page(s) 100105

Abstract: A biofilm is a three-dimensional microbial community, which is difficult to completely control with a typical sanitizer owing to its complex structure. The aim of this study was to establish a system for the combined treatment of biofilms with 10 ppmv ... ...

Abstract	A biofilm is a three-dimensional microbial community, which is difficult to completely control with a typical sanitizer owing to its complex structure. The aim of this study was to establish a system for the combined treatment of biofilms with 10 ppmv gaseous chlorine dioxide (ClO
MeSH term(s)	Disinfectants/pharmacology ; Colony Count, Microbial ; Gases ; Food Microbiology ; Hydrogen Peroxide/pharmacology ; Peracetic Acid/pharmacology ; Anti-Infective Agents ; Biofilms ; Listeria monocytogenes
Chemical Substances	chlorine dioxide (8061YMS4RM) ; Disinfectants ; Gases ; Hydrogen Peroxide (BBX060AN9V) ; Peracetic Acid (I6KPI2E1HD) ; Anti-Infective Agents
Language	English
Publishing date	2023-05-15
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	243284-5
ISSN	1944-9097 ; 0362-028X
ISSN (online)	1944-9097
ISSN	0362-028X
DOI	10.1016/j.jfp.2023.100105
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Article ; Online: Inactivation of Bacillus cereus endospores on black pepper by pulsed superheated steam system.

Kim, Soo-Hwan / Park, Sang-Hyun / Kang, Dong-Hyun

Food research international (Ottawa, Ont.)

2023 Volume 167, Page(s) 112649

Abstract: In this study, a superheated steam (SHS) system was constructed to inactivate Bacillus cereus endospores on the surface of black pepper, and continuous and pulsed treatment was applied to compare sporicidal effects. Additionally, inactivation mechanisms ... ...

Abstract	In this study, a superheated steam (SHS) system was constructed to inactivate Bacillus cereus endospores on the surface of black pepper, and continuous and pulsed treatment was applied to compare sporicidal effects. Additionally, inactivation mechanisms were analyzed to investigate the differences between pulsed and continuous SHS treatments. SHS at 250 °C and 300 °C for 1 min achieved more than a 3 log reduction, whereas SHS at 200 °C for 1 min achieved less than 2 log reduction in the number of endospores. In addition, higher microbicidal effects were confirmed with pulsed SHS treatment with a shorter duty ratio. To elucidate the inactivation mechanisms, inner membrane damage (dipicolinic acid release), intracellular enzyme activities, and DNA integrity were measured after 300 °C SHS pulsed or continuous treatments. After pulsed SHS treatment for up to 20 s, intracellular enzymes were inactivated more rapidly than after continuous treatment, and more DPA was released after 40 s of treatment, indicating that enzyme inactivation occurred prior to inner membrane damage, and pulsed treatment accelerated this mode of action. DNA integrity was significantly lower after 60 s of pulsed or continuous treatment; however, there was no difference in between pulsed and continuous treatments. Our results provide fundamental insights for the sterilization of black pepper by SHS treatment in food industries.
MeSH term(s)	Bacillus cereus ; Steam ; Piper nigrum ; Spores, Bacterial ; Sterilization
Chemical Substances	Steam
Language	English
Publishing date	2023-03-02
Publishing country	Canada
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1111695-x
ISSN	1873-7145 ; 0963-9969
ISSN (online)	1873-7145
ISSN	0963-9969
DOI	10.1016/j.foodres.2023.112649
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Article ; Online: Effect of high hydrostatic pressure treatment on the inactivation and sublethal injury of foodborne pathogens and quality of apple puree at different pH.

Lee, Eun-Jung / Kim, Soo-Hwan / Park, Sang-Hyun

Food microbiology

2023 Volume 114, Page(s) 104302

Abstract: The objectives of this study were to evaluate the survival of high hydrostatic pressure (HHP)-treated Salmonella Typhimurium, Escherichia coli O157:H7, and Listeria monocytogenes in apple puree, as well as to determine the levels of HHP-induced cell ... ...

Abstract	The objectives of this study were to evaluate the survival of high hydrostatic pressure (HHP)-treated Salmonella Typhimurium, Escherichia coli O157:H7, and Listeria monocytogenes in apple puree, as well as to determine the levels of HHP-induced cell injury according to the pressure level, holding time, and pH of apple puree. Apple puree was inoculated with three foodborne pathogens and treated at pressures of 300-600 MPa for up to 7 min at 22 °C using HHP equipment. Increasing the pressure level and lowering the pH of apple puree led to larger microbial reductions, and E. coli O157:H7 showed higher resistance compared to S. Typhimurium and L. monocytogenes. Besides, approximately 5-log injured cells of E. coli O157:H7 were induced in apple puree at pH 3.5 and 3.8. HHP treatment at 500 MPa for 2 min effectively achieved complete inactivation of the three pathogens in apple puree at pH 3.5. For apple puree at pH 3.8, more than 2 min treatment of HHP at 600 MPa is seemingly needed to achieve complete inactivation of the three pathogens. Transmission electron microscopy analysis was conducted to identify ultrastructural changes in the injured or dead cells after HHP treatment. Plasmolysis and uneven cavities in the cytoplasm were observed in injured cells, and additional deformations, such as distorted and rough cell envelopes, and cell disruption occurred in dead cells. No changes in solid soluble content (SSC) and color of apple puree were observed after HHP treatment, and no differences were detected between control and HHP-treated samples during 10 d of storage at 5 °C. The results of this study could be useful in determining the acidity of apple purees or the treatment time at specific acidity levels when applying the HHP processing.
MeSH term(s)	Hydrostatic Pressure ; Malus ; Food Microbiology ; Escherichia coli O157 ; Listeria monocytogenes ; Hydrogen-Ion Concentration ; Colony Count, Microbial
Language	English
Publishing date	2023-04-29
Publishing country	England
Document type	Journal Article
ZDB-ID	50892-5
ISSN	1095-9998 ; 0740-0020
ISSN (online)	1095-9998
ISSN	0740-0020
DOI	10.1016/j.fm.2023.104302
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Article: Comparative study of Salmonella Typhimurium biofilms and their resistance depending on cellulose secretion and maturation temperatures

Kim, Soo-Hwan / Jyung, Sunna / Kang, Dong-Hyun

Lebensmittel-Wissenschaft + [i.e. und] Technologie. 2022 Jan. 15, v. 154

2022

Abstract: We investigated the aspects of S. Typhimurium biofilms and their resistance (thermal and chemical) depending on the different morphotypes at room temperature (rdar; strain 43971 and bdar; strain 19585) and maturation temperature. Strain 19585 biofilm had ...

Abstract	We investigated the aspects of S. Typhimurium biofilms and their resistance (thermal and chemical) depending on the different morphotypes at room temperature (rdar; strain 43971 and bdar; strain 19585) and maturation temperature. Strain 19585 biofilm had a relatively low cell mass and polysaccharide content compared to strain 43971 in all cases, and when matured for 9 days at 15 °C, both properties were significantly higher than at 25 and 37 °C maturation. The difference in secretion ability influenced the pattern in which the biofilm increased resistance. The thermal and chemical resistance levels of strain 19585 biofilms increased at 15 °C, and those of strain 43971 biofilms increased at 15 and 25 °C. When the two strains were mixed, the aspect of biofilm formation was similar to that of strain 43971 except that the heat and chemical resistance were higher at 37 °C maturation. Following 9 days of biofilm maturation, we concluded that 15 °C compared with 25 and 37 °C was the optimal condition for rdar and bdar strains in terms of quantity of total cell mass, EPS secretions and resistance against heat and chemical treatments.
Keywords	Salmonella Typhimurium ; ambient temperature ; biofilm ; cellulose ; comparative study ; heat ; morphs ; secretion
Language	English
Dates of publication	2022-0115
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	241369-3
ISSN	0460-1173 ; 0023-6438
ISSN	0460-1173 ; 0023-6438
DOI	10.1016/j.lwt.2021.112700
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Canine-inspired Unidirectional Flows for Improving Memory Effects in Machine Olfaction.

Kim, Soohwan / Mukherjee, Sandeepan / Fonollosa, Jordi / Hu, David L

Integrative and comparative biology

2023 Volume 63, Issue 2, Page(s) 332–342

Abstract: A dog's nose differs from a human's in that air does not change direction but flows in a unidirectional path from inlet to outlet. Previous simulations showed that unidirectional flow through a dog's complex nasal passageways creates stagnant zones of ... ...

Abstract	A dog's nose differs from a human's in that air does not change direction but flows in a unidirectional path from inlet to outlet. Previous simulations showed that unidirectional flow through a dog's complex nasal passageways creates stagnant zones of trapped air. We hypothesize that these zones give the dog a "physical memory," which it may use to compare recent odors to past ones. In this study, we conducted experiments with our previously built Gaseous Recognition Oscillatory Machine Integrating Technology (GROMIT) and performed corresponding simulations in two dimensions. We compared three settings: a control setting that mimics the bidirectional flow of the human nose; a short-circuit setting where odors exit before reaching the sensors; and a unidirectional configuration using a dedicated inlet and outlet that mimics the dog's nose. After exposure to odors, the sensors in the unidirectional setting showed the slowest return to their baseline level, indicative of memory effects. Simulations showed that both short-circuit and unidirectional flows created trapped recirculation zones, which slowed the release of odors from the chamber. In the future, memory effects such as the ones found here may improve the sensitivity and utility of electronic noses.
MeSH term(s)	Animals ; Dogs ; Odorants ; Smell ; Technology
Language	English
Publishing date	2023-04-25
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	2159110-6
ISSN	1557-7023 ; 1540-7063
ISSN (online)	1557-7023
ISSN	1540-7063
DOI	10.1093/icb/icad016
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