Arsenic Toxicity on Duck Spermatozoa and the Ameliorating Effect of L-Ascorbic Acid

Lin, Chai-Ching,Huang, Chia-Cherng,Chen, Ming-Cheng,Huang, Andrew Jeng-Fang,Chiou, Hung-Yi Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.1

The objectives of this study were to understand the possible mechanism of duck sperm toxicity induced by arsenic exposure in vivo, and to investigate the roles of the antioxidant L-ascorbic acid in ameliorating the arsenic-induced sperm impairment. To test the acute toxicity, the percentages of mortality of mature drakes treated with different concentrations of trivalent sodium arsenite, As (III), and pentavalent sodium arsenate, As (V) were measured. The LD50 value of As (III) for mature drakes was $4.89{\pm}1.49$ ppm. Although As (V) didn't cause any deaths even at a concentration of 40 ppm, the chronic toxicity of As (V) on sperm quality was shown by a decreased fertilization rate. When the concentrations of As (V) were above 0.4 ppm, fertilization rates were lower than those of 0.04 ppm and control. Drakes treated with 40 ppm of As (V) had the highest malondialdehyde (MDA) level in the testis tissue, $3.100{\pm}0.218{\mu}mole/g$ testis. This showed that 40 ppm of As (V) significantly induced lipid peroxidation in testis tissue. For the 1.2 ppm As (III) treatment, several significant effects were observed: (1) sperm motility was decreased most dramatically by $52.0{\pm}9.1$% after three days of incubation; (2) fertilization rate of artificially inseminated semen was the lowest, $26.4{\pm}15.4$; (3) the MDA concentration in testis tissue, $7.846{\pm}0.246{\mu}mole/g$ testis, was significantly higher than the others (p<0.05); (4) the sperm number, $1.17{\pm}0.40({\times}10^9)$, was significantly lower than with the 60 ppb and control treatments (p<0.05); (5) a black appearance and soft texture was observed in the testis tissue. The antioxidant L-ascorbic acid administered along with 1.2 ppm As (III) decreased the toxicity of arsenic. The ameliorating effects included: improved sperm motility, increased sperm number and fertilization rate, and decreased MDA concentration in the testis tissue. This study suggests that the toxicity of the trivalent arsenic on sperm quality is partly from free radicals generated by its metabolic pathway, and the antioxidant ascorbic acid ameliorates arsenic-caused sperm impairment.

중국 출신 이주청소년들이 경험한 초국적 불안정성 -학력 중단 이후 교육 및 진로탐색 경험을 중심으로-

채소린(Chai, So-Lin) 한국교육사회학회 2021 교육사회학연구 Vol.31 No.3

본 연구는 10대 청소년기에 부모가 있는 한국으로 이주하게 된 조선족 청소년들의 교육과 진로탐색 경험 분석을 통하여 이들이 한중 양국 모두에서 사회의 중심부로 통합되기 어려운 현실에 주목하였다. 즉, 이주 과정에서 학력 중단을 경험한 이주청소년들의 교육과 노동 경험 분석을 통하여 이들 삶의 초국적 불안정성을 줄이기 위한 대안적 사유를 하는 것이 연구의 목적이다. 연구 결과, 학교 밖 이주청소년들은 한국과 중국 모두에 연결되어 있지만 동시에 한국과 중국 그 어디에도 뿌리 깊이 정착하지 못한 채 사회의 주변부에 위치하게 되는 역설적인 상황에 처해있었다. 가족, 교육, 노동, 국가와 맺고 있는 관계가 총체적으로 불안정한 가운데 이주청소년들의 한국 사회 적응과 통합을 위한 각종 실천에도 불구하고 이들이 이주노동자의 위치에서 이동하는 것은 어려웠다. 따라서 이주청소년들이 한국과 중국 모두에서 청년 프레카리아트 집단으로 남지 않고 보다 안정적인 사회적 위치로 이동하기 위해서는 이주청소년에 관한 지원정책과 사회적 인식이 변화할 필요가 있다. 첫째, 이주청소년들의 교육권과 직업선택권이 더욱 다양한 차원에서 보장될 수 있는 방향으로 중도입국청소년 지원정책이 변화해야 한다. 연구참여자들이 한국 이주 후 직면했던 학력 중단 경험, 진로계획의 부재, 학교 밖 학력 취득의 어려움, 직업교육 이후의 안정적 일자리 확보의 어려움 등의 상황을 개선하기 위해서는 정책의 목표가 ‘중도입국청소년의 한국 주류사회 진입과 사회적 이동 가능성 확보’라는 측면으로 재조정될 필요가 있다. 둘째, 동시대 한국 사회를 살아가는 이주청소년들에 대한 새로운 이해를 바탕으로 청소년기에서 청년기로 이행하고 있는 이주청소년들에 대한 관점을 전환해야 한다. 이주청소년이 갖고 있는 한국 생활에 대한 기대와 청년으로서 열망하는 자신의 미래 모습은 이주노동자로서의 삶에 국한되어 있지 않았다. 이들은 한국 이주 후 경제적 성취뿐 아니라 문화적, 지적 성장을 지속하며 상향이동 하기를 원하고 있었다. 향후에는 이주청소년들이 한국 주류사회로 진입할 수 있는 방향으로 중도입국청소년 정책과 사회통합 논의가 진행되어야 할 것이다. This study focused on the reality that it is difficult for Korean-Chinese youths who migrated to South Korea in their teenage years to be integrated into the center of society in both South Korea and China. The purpose of this study is to give alternative thoughts to reduce the transnational precarity of life through the analysis of the education and work experience of migrant youths who experienced school dropout during the migration process. As a result of the study, the out-of-school migrant youths were connected to both South Korea and China, but at the same time, were in a paradoxical situation of being located on the social margins in both South Korea and China. It was difficult for them to move from the position of migrant workers as their relationships with family, education, labor, and the state were generally precarious. Therefore, in order for migrant youths to move to a more stable social position rather than remain as a youth precariat group in both South Korea and China, it is necessary to change policies and social perceptions regarding migrant youth. First, it is necessary to change the policy for migrant youth in such a way that the right to education and the right to choose a job can be guaranteed in more diverse ways. Therefore, the policy goal needs to be readjusted in terms of Securing the possibility of entry into South Korea s mainstream society and social mobility of immigrant youths . Second, it is necessary to change the perspective on migrant youths who spend their adolescence in South Korea and are transitioning to adult. The future they aspire to as a young people were not the lives as migrant workers. In the future, the social integration policy needs to be readjusted in such a way that migrant youth can enter South Korea’s mainstream society.

조소앙 저 『유방집』의 의식세계와 중국현대문화와의 관련에 대한 고찰

차이린 ( Chai Lin ),김병민 ( Jin Bing-min ) 반교어문학회 2020 泮橋語文硏究 Vol.0 No.55

20세기 동아시아문학에서 한국인 의열투쟁 제재 문학작품은 헤아릴 수가 없이 많을 뿐만 아니라 이미 동아시아 문학의 일개 특색이 되었다. 중국으로 망명한 한국문인 조소앙의 한문 전기 『유방집(遺芳集)』은 대표적인 의열서사 작품집으로서 의열인물 81명의 전기가 수록되었다. 작자는 전기 주인공의 형상을 통하여 역사진실을 환원하고 민족 각성과 애국투쟁정신을 호소하였다. 『유방집』의 간행은 중국지사들의 도움을 받았고 중국에서도 적극적인 영향을 미쳤다. 중국 지사 60여명은 서문, 후기, 시가, 제사 등의 형식으로 『유방집』의 간행을 높게 평가하였다. 『유방집』의 간행은 중국현대문학사에서 한국 제재 문학작품의 창작에 적극적인 일정한 영향을 일으켰었다. 『유방집』의 출판·발행을 통하여 한중 지사들이 공동으로 20세기 동아시아 정신을 구축한 역사의 일면을 살펴볼 수가 있다. 『유방집』에 대한 연구는 동아시아 역사기억을 되살리고 동아시아 정신가치를 재평가하며 동아시아 미래를 공유하는 데에 유익한 계시를 줄 수 있다고 생각된다. Among the East Asian literature in the 20th century, there are numerous literary works with the theme of Korean people's patriotic struggle, which has become a landscape of the East Asian spirit at that time. Yifangji, a Chinese biography written by exiled literati Cho So-ang including 81 biographies of heroic figures, is the most representative collection of heroic narrative. The author calls for national awakening and the anti-imperialist patriotic struggle spirit by reproducing the historical scene and activating the historical memory through the image of protagonist. The publication of “Yifangji” received great help from people with lofty ideals in China, and also generated positive reactions in China. More than 60 of them have highly praised the publication of the book by writing preface, postscript, poems and inscriptions. The publication of “Yifangji”has played a positive role in promoting the creation of Korean literary works in modern Chinese literature. From the publication of the book, it is fully evident that the modern ambitious people of China and Korea jointly build a glorious history of the East Asian spirit of the 20th century, which will provide useful enlightenment for us to revaluate the history and reconstruct the value.

THE AMERICAN ECONOMY IN THE 1970S : A BACKWARD LOOK

Cheng, Chai Lin 한국아메리카학회 1983 美國學論集 Vol.14,15 No.-

망명과 선전(宣傳): 중일전쟁시기 이두산의 문필활동과 의식변화

시림(CHAI Lin) 계명대학교 한국학연구원 2020 한국학논집 Vol.0 No.79

A Feature-based Tumor Detection for MRI Breast Imaging

Guo-Shiang Lin,Sin-Kuo Daniel Chai,Wei-Cheng Yeh,Lin-Jie Cheng 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7

In this paper, we propose a feature-based scheme composed of the intra-slice, texture and inter-slice analyses to achieve tumor region identification in MRI breast images. Our intra-slice analysis evaluates the intensity and size information of candidate regions. To find a precise region, a region growing algorithm is proposed based on ellipse fitness. In the texture analysis, some texture features are extracted and combined with a neural network to reduce the false alarms. The inter-slice analysis is based on the continuity characteristic to verify the static behavior of tumor regions. The experimental results show that our proposed scheme can correctly identify tumor regions.

혈장중 Acebutolol 및 그 Acetyl 대사체의HPLC 분석

Emil T Lin,백채선 한국약제학회 1993 Journal of Pharmaceutical Investigation Vol.23 No.3

㎍/㎖A high-performance liquid chromatographic assay using ion-pair reverse-phase system was developed for the separation of acebutolol and acebutolol acetyl metabolite in plasma. A ion-pair reverse-phase system consisting of an ODS-bonded silica column and a mixture of 20% CH₃CN, 0.1% H₃PO₄, 0.035 M heptanesulfonic acid and 0.005 M tetrabutylammonium hydrogen sulfate as the mobile phase were used. Triamterene was employed as an internal standard. Based on 0.2 ㎖ of plasma, the detection limits were 10.4 ng/㎖ for acebutolol and 10.3 ng/㎖ of acebutolol acetyl metabolite at the signal-to-noise ratio of 3:1.

Robust Stabilization of a Class of Uncertain Fractional-order Chaotic Systems via a Novel Sliding Mode Control Scheme

Xiaomin Tian,Shumin Fei,Lin Chai 보안공학연구지원센터 2014 International Journal of Hybrid Information Techno Vol.7 No.6

This paper proposes a novel sliding mode control (SMC) scheme to stabilize a class of fractional-order chaotic systems. Through constructing two sliding mode variables, the control problem of n-dimensional system can be transformed to the equivalent stabilizing problem of a reduced-order system. Subsequently, on the basis of second-order sliding mode (SOSM) technique, a robust control law is designed, which strongly attenuates the chattering phenomenon inherent in traditional sliding mode controller, and guarantees the existence of sliding motion in a finite time. The stability of two sliding mode variables to the origin is proved by conventional and fractional Lyapunov theories, respectively. Finally, two numerical examples are provided to illustrate the effectiveness of the proposed approach.

Effects of Alternating Temperatures and Light on Germination of Carica papaya L

Chai-Hsia Gan,Loong-Sheng Chang,Tzong-Shyan Lin 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

Genetic characteristics of the Korean isolate KI-1 of Toxoplasma gondii

Aifen LIN,Eun-Hee SHIN,Tae-Yun KIM,Jae-Hwan PARK,Sang-Mee GUK,Jong-Yil CHAI 대한기생충학열대의학회 2005 The Korean Journal of Parasitology Vol.43 No.1