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- 저자 : 송하나 (검색결과 253 건)
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송하나,장아라,이소율,이선영 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.7
The safety and quality of fresh-cut melons is reduced by a series of decay processes by enzymatic browning and microbial contamination. This study aimed to assess the impact of a 2% sodium alginate-based edible coating (ALC) combined with different concentrations of citric acid (CA; 0.5%, 1%, 2%, and 3%) on the microbial safety and physical quality of fresh-cut melons during a 7-day storage period at 10 °C. The findings revealed that the combination of ALC and 3% CA was successful in preventing the growth of pathogenic bacteria (Escherichia coli O157:H7, Salmonella spp., Listeria monocytogenes, and Staphylococcus aureus) and natural microflora on fresh-cut melons during storage. In addition, treating fresh-cut melons with ALC containing 3% CA improved their quality by reducing browning and softening during storage at 10 °C. Based on these findings, it can be concluded that using ALC with 3% CA is an effective method to improve the safety and quality of fresh-cut melons.
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Resistance of pathogenic biofilms on glass fiber filters formed under different conditions
송하나,이선영 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.9
This study investigated the survivals of twopathogens (Escherichia coli O157:H7 and Staphylococcusaureus) in different adhered forms on glass fiber filters(GFFs) at 43 and 68% relative humidity (RH). Efficacies ofchemical sanitizers at reducing pathogenic biofilms onGFFs were also evaluated. Inoculated GFFs were incubatedat 28 C in TSB (type I), on TSA (type II), or on TSAunder 100% RH (type III) to produce biofilms. When GFFswere incubated at 43 or 68% RH for 7 days, type III biofilmswere less than 2 log10 CFU/filter reduction whereastype I and type II biofilms were 4–6 log10 CFU/filterreduction. Additionally, type III biofilms were highlyresistant to sanitizing treatment compared than other biofilms(type I and II). Therefore, the method to producebiofilms used in this study could be used to produce highlyresistance pathogenic biofilms in the laboratory for relatedexperiments.
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송하나,박지현,조자원 대한예방치과학회 2017 International Journal of Clinical Preventive Denti Vol.13 No.4
Objective: The aim of this clinical study was to determine the desensitization effect of the calcium glycerophosphate-containing dentifrice at bed time. Methods: Patients with symptoms of mild to severe dentin hypersensitivity between 20 and 40 years of age were allocated into two groups; the experimental group and the control group. Each group had used the dentifrice containing or excluding calcium glycerophosphate for 3 weeks. Symptoms of all participants were measured at baseline, after 3 days, 5 days, 1 week, 2 weeks and 3 weeks by the air blow method and the electric pulp tester (EPT). Results: Symptoms of dentin hypersensitivity measured by the air blow method decreased in the experimental group (from 6.03 at baseline to 5.85 at 3 days, 5.36 at 5 days, 5.09 at 1 week, and 4.75 at 2 weeks) and there was a significant difference in the reduction effect after 5 days (p<0.05). With the EPT method, there was a statistically significant difference in the hypersensitivity reduction effect in the experimental group after 1 week (from 18.80 at baseline to 18.80 at 3 days, 19.17 at 5 days, 21.33 at 1 week, and 22.30 at 2 weeks, p<0.05). Conclusion: The use of a dentifrice containing calcium glycerophosphate at bedtime produced significant reductions in hypersensitivity and rapid effects in relieving hyperesthesia, compared with the control group.
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송하나,윤재현,최윤선,한아름,김지연,현정은,배영민,암다둘허크,최창순,박기환,이선영 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.4
In this study, a total of 195 samples includingfresh produce and farming environments was used to performthe microbial risk assessment. Levels of total aerobicbacteria ranged from 2.77 to 5.99, 6.28 to 7.81, and 1.31 to2.74 log10 CFU/g, whereas levels of coliforms wereB 2.48, B 3.35, and B 0.85 log10 CFU/g, levels ofEscherichia coli were B 1.04, B 0.12, and B 1.69 log10CFU/g in fresh produce, soil, and irrigation water,respectively. When the presence of pathogenic bacteria wasdetected, only Bacillus cereus and Staphylococcus aureuswere isolated from 14 (7.2%) and 7 (3.6%) samples out of195 samples, respectively. From the results, it was difficultto find a strong correlation between microbial contaminationof fresh produce and their farming environments. However, continuous monitoring of agricultural productsand related environments should be undertaken in order toensure the microbial safety of fresh produce.
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송하나,장수경,황옥경,이홍진,전향숙 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.6
The cytotoxicity of TiO2 nanoparticles are wellknown,but the particle size-dependent induction of ERstress and apoptosis by TiO2 in hepatocytes has not beenelucidated clearly. In the present study, we investigatedwhether a fine TiO2 particle and two types of TiO2nanoparticles induce ER stress and apoptosis differently inHepG2 cells. A particle size-dependent decrease in cellviability was observed after exposure to the TiO2 particles. The levels of ER stress-related proteins (BiP, CHOP,ATF6a, and p-PERK) were increased with decreasingparticle size. TiO2 particles induced ER stress-mediatedapoptosis in a particle size-dependent manner as seen by adecrease in the expression of Bcl-2, and increases in theexpression of Bax, caspase-12, and cleaved caspase-3. These results indicated that the cytotoxicity produced byTiO2 particles was related to particle size, with smallerTiO2 nanoparticles producing greater toxic effects involvingER stress and apoptosis in the HepG2 cells.
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유아의 우울과 정서이해와의 관계에 대한 연구 : 연령차와 성차를 중심으로
송하나 한국유아교육학회 2011 유아교육연구 Vol.31 No.4
본 연구는 유아의 우울이 정서 이해에 미치는 영향을 알아보고 또한 성과 연령이 이 두 변인간의 관계에 어떠한 영향을 주는지 알아보기 위해 수행되었다. 만 4-6세 유아 92명이 어머니와 함께 실험실을 방문하여 자유놀이 시간을 가진 후, 소아우울척도와 정서 이해능력을 측정하는 손 인형 인터뷰를 실시하였다. 연구 결과, 정적 정서에서 연령차가 유의하였으며 슬픔에 대한 이해에서는 여아의 집단에서만 연령차가 있는 것으로 나타났다. 또한 우울과 정서 이해와의 관계는 유아의 연령에 따라 차이가 있었다. 만 4세 에서는 우울이 정적 정서와 부적 상관이 있었으나, 5, 6세 집단에서는 우울이 부적 정서에 영향을 주는 것으로 나타났다. 또한 우울과 정서 이해와의 관계는 남아 집단에서 더 뚜렷이 나타났다. 이러한 결과들은 정서 이해의 발달적 특성과 정서적 사회화 과정을 바탕으로 논의되었다. 또한 정서적 특성을 토대로 유아의 우울을 발견하고 다룰 수 있는 시사점을 제시하였다. This study examines the relationship between depression and emotion understanding of preschool children. The influence of age and gender on this relationship was also examined. Ninety-two children 4, 5, and 6 years of age participated in this study. The children and their mothers were interviewed in a laboratory setting using a child depression inventory and a puppet task. Results reveal significant age and gender differences in emotion understanding. Older children showed higher levels of understanding of positive emotions than did younger children, and girls understood sadness better than did boys. In addition, depression negatively correlated with the understanding of positive emotions in younger children, but negatively correlated with the understanding of negative emotions in older children. Especially, the relationship between depression and the understanding of anger was significant only for boys, not for girls. These results are discussed on the basis of the development and the socialization of emotion. Suggestions for educators and future study are presented.
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