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Nana Shi,Kaiyue Sun,Zedi Zhang,Juan Zhao,Lina Geng,Yuhua Lei 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-
Carbon dot (CDs) were prepared for carrying DOX (Doxorubicin) or FAC (Ferric ammonium citrate), andthe loading mechanism and release kinetics of CDs-drugs were studied. CDs were prepared using peonypollen and urea, and characterized by TEM, XRD, 13C NMR, XPS, UV, FT-IR, DLS and zeta potential. Theobtained CDs were rich of –NH2 group on the surface, amorphous phase, spherical morphology withthe diameter about 5 nm, and had a blue fluorescence with the quantum yield (QY) of 12%. Iron disorderscan cause cancer or anemia. DOX is used for treating cancer, but has severe side effects. FAC is an ironsupplement agent, but had low bioavailability. CDs carried DOX (or FAC) through –N=C– (or –CONH–)bond, had high loading efficiency for DOX (37.2%) and FAC (54.0%) by optimizing mass ratios of mCDsto mdrug and reacted overnight. Cellular experiments showed that CDs-drugs had lower cytotoxicity thanfree drugs and CDs co-located with the drug. In vitro release indicated that CDs-DOX had pH-targetedproperty and CDs-FAC could be absorbed easily. CDs-drug release belonged to Weibull model, and releasemechanism was determined by the bonding way between CDs and drug. CDs had potential applicationsin delivery drugs with –C=O or –COOH group.
신나나(Nana Shin),박보경(Bokyung Park),김민주(Minjoo Kim),윤기봉(Kibong Yun),윤선영(Sun-Young Yoon) 한국아동학회 2017 아동학회지 Vol.38 No.3
Objective: This study examined the relationships among sleep problems, executive function and social behavior during the preschool period. In addition, the mediating role of executive function between sleep problems and social behavior was investigated. Methods: A total of 304 preschool children participated in this study. The data were collected through maternal reports. Results: First, preschoolers’ sleep problems were found to be significantly related to overt aggression and prosocial behavior. Second, preschoolers with sleep problems displayed lower levels of executive function. Third, preschoolers’ executive function was significantly associated with social behavior. Lastly, preschoolers’ executive function fully mediated the relationship between sleep problems and overt aggression, and between sleep problems and prosocial behavior. That is, preschoolers’ sleep problems had effects on overt aggression and prosocial behavior, only through the effects on executive function. Conclusion: This study contributes to the sleep literature by examining the role of executive function and emphasizes the importance of forming a healthy sleep habit during the preschool period.
Upper Extremity Deep Vein Thrombosis After Botulinum Toxin Injection: A Case Report
Lim Nana,Lee Geun Su,Won Ki Hong,Kang Jin Sun,Lee Sung Hoon,Kang Eun Young,Lee Hyun Kyung,Cho Youn Kyung 대한재활의학회 2021 Annals of Rehabilitation Medicine Vol.45 No.2
Botulinum toxin (BoNT) injection is widely used to improve spasticity. However, after the treatment, the patient may experience pain, inflammation, swelling and redness at the injection site. In this case, we addressed deep vein thrombosis (DVT) after BoNT treatment of the upper limb. A male aged 37 years had spasticity and dystonia in his left upper extremity. BoNT-A 100 U was injected into the left biceps brachii and an equal amount into the brachialis to relieve spasticity. After three days, he developed redness and painful swelling in the left upper arm and the next day, through the upper extremity computed tomography venography, DVT was identified in the left cephalic vein. The thrombus resolved after the anticoagulation therapy with rivaroxaban (Xarelto). We hypothesized the role of mainly three mechanisms in the development of DVT in this case: repetitive strenuous activity, relative stasis due to reduced muscle tone, and possible direct mechanical damage to the vessel wall.
한국 유아의 마음이론 측정을 위한 사회적 이해 척도의 타당화 연구
윤선영(Sun-Young Yoon),신나나(Nana Shin) 한국아동학회 2020 아동학회지 Vol.41 No.2
Objectives: The main purpose of this study was to validate the Children’s Social Understanding Scale (CSUS), which was developed and validated by Tahiroglu et al. (2014). Methods: A total of 530 preschoolers and their mothers participated in a series of studies designed to validate the CSUS. The mothers responded to questions related to the preschoolers’ Theory of Mind (ToM), executive function, and their parenting behaviors. The preschoolers were given a series of ToM tasks and a verbal ability test. The psychometric properties of the CSUS were assessed in three studies. Results: Study 1 examined content validity of the CSUS through expert evaluation, construct validity through confirmatory factor analysis, and reliability through internal consistency and test-retest reliability coefficients. Study 2 tested convergent validity by examining the relationships between the CSUS and the ToM task scores. In Study 3, a confirmatory factor analysis was conducted to evaluate cross-validation using different samples of preschoolers. In addition, concurrent validity was confirmed by the association among the CSUS, executive function, and parenting behaviors. Conclusion: The findings of this study indicate that the CSUS is a reliable and valid measure of preschoolers’ theory of mind. The CSUS can be used as a tool for estimating individual differences in preschoolers’ ToM, as well as correlations with other aspects of development.
Hiu Liu,Nana Xin,Qingxi Cao,Long Sha,Dezhi Sun,Shaohua Wu 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.4
The Computational fluid dynamics (CFD) code PHOENICS is applied to simulate and evaluate the combustion process within the furnace of a 1,000MW dual circle tangential firing single furnace lignite-fired ultra supercritical (USC) boiler. The dependence on overfire air (OFA) positioning on the combustion process is studied. The results show that the highest temperature appears on the upside of the burner zone close to the front wall, and the high temperature zone rises with elevated OFA positions. However, the temperature field distributions are similar despite differing OFA positions. The char content near the rear wall is higher than that near the front wall, and below the furnace arch, coal particles concentrate towards the front wall. Also with elevated OFA positions, nitrogen oxide (NOx) concentrations at the outlet fall, but char content increases. In regard to NOx emission and char burnout, the suggested optimal distance from the OFA center to the center of the uppermost primary air nozzle should be 6 meters.
Practical Synthesis of 1,1-Difluoro- or 1-Fluoroalkenes from 2,2,2-Trifluoroacetophenone Derivatives
Minhyuk Kang,Sun-Ah Lee,Nana Kang,문봉진 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.8
Since the discovery of the fact that compounds bearing a vinylic fluoride moiety often exhibit remarkable biological activities such as enzyme inhibitors, many synthetic methods for fluorine-substituted vinylic compounds have been developed. The synthesis of selectively fluorinated building blocks, such as arylsubstituted fluoro-alkenes, also has become an area of interest in recent years. Herein we describe a novel and practical method for the synthesis of 1,1-difluoro- and 1-fluoroalkenes starting from easily accessible trifluoroacetophenone derivatives. Various 1,1-difluoro- and 1-fluoroalkenes were prepared by the reaction of the corresponding tosyl hydrazones that were derived from trifluoroacetophenone derivatives by treating with alkyl or aryllithium reagents via addition-elimination and single electron transfer (SET) mechanism.
어머니의 아동기 부모애착, 결혼만족도 및 심리적 안녕감 간의 관계
박보경(Bokyung Park),신나나(Nana Shin),윤기봉(Kibong Yun),김민주(Minjoo Kim),김수지(Soojee Kim),윤선영(Sun-Young Yoon) 한국아동학회 2017 아동학회지 Vol.38 No.5
Objective: This study examined the pathways from mothers’ childhood attachment to parents to psychological well-being. In addition, the mediating role of marital satisfaction on the relationship between childhood attachment to parents and psychological well-being was investigated. Methods: A total of 294 mothers with preschool-aged children responded to questionnaires regarding childhood attachment to parents, marital satisfaction, and psychological well-being. The data were analyzed using SEM. Results: Mothers’ childhood attachment to their mothers had a direct effect on psychological wellbeing and an indirect effect on psychological well-being through marital satisfaction. That is, mothers who had secure childhood attachment to their mothers showed a high level of psychological well-being. In addition, mothers with secure childhood attachment to their mothers tended to be more satisfied with their marriage, which led to higher levels of psychological wellbeing. However, mothers’ childhood attachment to their fathers did not have significant effects on either their marital satisfaction or psychological well-being. Conclusion: These findings emphasize the importance of mothers’ positive relationships with their mothers and husbands in promoting psychological well-being.
( Jaehyung Koo ),( Sen Wang ),( Nana Kang ),( Sun Jin Hur ),( Young Yil Bahk ) 생화학분자생물학회 2016 BMB Reports Vol.49 No.7
Ras oncoproteins are small molecular weight GTPases known for their involvement in oncogenesis, which operate in a complex signaling network with multiple effectors. Approximately 25% of human tumors possess mutations in a member of this family. The Raf1/MEK/Erk1/2 pathway is one of the most intensively studied signaling mechanisms. Different levels of regulation account for the inactivation of MAP kinases by MAPK phosphatases in a cell type- and stimuli-dependent manner. In the present study, using three inducible Ras-expressing NIH/3T3 cell lines, we demonstrated that MKP3 upregulation requires the activation of the Erk1/2 pathway, which correlates with the shutdown of this pathway. We also demonstrated, by applying pharmacological inhibitors and effector mutants of Ras, that induction of MKP3 at the protein level is positively regulated by the oncogenic Ras/Raf/MEK/Erk1/2 signaling pathway. [BMB Reports 2016; 49(7): 370-375]