본 연구는 국내 자생하는 진달래속(Rhododendron) 종들의 종자 휴면유형 분류 및 발아특성 구명을 목표로 하였다. 진달래속 종들의 배는 형태적휴면(MD)이 없는 완전히 발달된 직선(linear) 형태였으며, 만병초 및 꼬리진달래 종자는 탈리 시점에 이미 휴면이 없는 것으로 밝혀졌다. 반면에 털진달래 종자는 population 수준에서 부분적으로 생리적휴면(PD)을 가지고 있는 것으로 나타났다. 털진달래의 이러한 생리적휴면 (PD)은 외생 지베렐린(GA3) 1,000mg･L-1 처리를 통해 타파될 수 있었다. 그러나 4℃에서의 저온층적처리는 털진달래 종자 휴면 타파에 효과가 없는 것으로 나타났다. 종합적으로 판단 했을 때, 진달래속(Rhododendron) 종들의 적정 발아 환경조 건은 광조건･25/15℃(만병초), 암조건･20/10℃(꼬리진달래), 광 조건･25/15℃(털진달래)로 확인된다. 진달래속(Rhododendron) 에서의 종간 차이(interspecific variation)로 인해 모든 종이 종자 휴면유형 또는 발아특성에서 구별이 되었다. 본 연구는 국내 자생하는 진달래속(Rhododendron) 종들의 생리･생태 특성을 이해하는 데 이용될 수 있을 것이다.

We aimed to predict the Italian ryegrass (IRG) productivity change of introduced and domestic varieties based on climate factors and identify suitable areas for IRG cultivation using the RCP 8.5 scenario. The minimum mean air temperature in January showed the highest correlation with productivity. The ratio of possible and low productivity areas was high in Gangwondo, and the ratio of suitable and best suitable areas was relatively high in the central and southern regions in the past 30 years. The change in the IRG cultivation area was found to be 26.9% in the best suitable area between 1981–2010 but increased significantly to 88.9% between 2090s. In the IRG suitability comparison classes between domestic and introduced cultivars, the ratio of suitable and best suitable areas was relatively high in the domestic varieties during the past 30 years. However, there is almost no difference between the IRG domestic and introduced varieties in the IRG suitability classes after the 2050s. These results can predict changes in the IRG suitability classes between domestic and introduced cultivars according to the climate change scenario, but there are limitations in accurately predicting the productivity of IRG because the results may vary depending on other environmental factors.

농촌진흥청 국립원예특작과학원에서는 2018년 분홍색계 소 형 호접란 ‘Tiny Bell’을 육성하였다. 2010년 진분홍색 다화 성 소형 품종 Phalaenopsis ‘D07PN16’와 연분홍색 소형종 P. ‘D03PN22’를 모본과 부본으로 교배하였다. 2014년 생육이 우 수하고 화색, 화형, 꽃대수 등 개화 특성이 우수한 ‘10531-53’ 개체를 선발하여 기내 화경배양을 통해 증식하였다. 2014년부 터 2018년까지 1차, 2차특성검정을 통해 품종의 안정성과 균 일성을 확인한 후 ‘Tiny Bell’로 명명하였다. 이 품종은 밝은 보라빛 분홍색(RHS, PVGN80A)을 띄며, 가장자리에 백색무늬 를 가지는 것이 특징이다. 평피기 형태의 꽃은 길이와 폭이 각각 3.89, 4.01cm이며, 총상화서로 분지가 발생한다. 1개의 꽃대에 19.7개의 소화가 착생하여 꽃 수가 많이 달리는 다화 성이며, 꽃대 길이는 28.48cm정도이다. ‘Tiny Bell’은 생육시 잎이 수평으로 자라며 길이와 폭은 각각 13.1cm, 5.3cm였다. 신품종인 ‘Tiny Bell’은 소형 분화용으로 이용 가능할 것이다.

Colon cancer is known as the third most widespread cancer in the world. The interaction of heme-iron and ascorbic acid (AA) in colon carcinogenesis is not evident. Hemin (ferric chloride heme) is an iron-containing porphyrin with chlorine that can be formed from a heme group. The purpose of this study was to investigate the protective effect of AA on the formation of pre-neoplastic lesions induced by azoxymethane (AOM)/dextran sodium sulfate (DSS) plus hemin in mice. Forty-five ICR male mice were divided into three experimental groups; AOM/ DSS treatment (control group), hemin (2 g hemin/kg of b.w.), hemin + AA (1.0% in drinking water). The mice had three s.c. injections (0–2nd weeks of the experiment) of AOM (10 mg/kg b.w.) weekly and 2% DSS as drinking water for the next one week and the animals fed on AIN-76A purified rodent diet for 6 weeks. The numbers of aberrant crypt foci (ACF) and aberrant crypts (ACs) in colonic mucosa were counted after methylene blue staining. Lipid peroxidation in feces was measured by the thiobarbituric acid-reactive substances (TBARS) assay. The numbers of ACF and ACs per colon significantly increased in Hemin group compared to the control group. However, the numbers of ACF and ACs per colon notably decreased in hemin + AA group compared to the control group or hemin group (p<0.05). In feces, the TBARS value of hemin group was higher than the control group (p<0.01). The TBARS value of hemin + AA group was slightly decreased compared to Hemin group. These results indicate that hemin can promote the experimental colon carcinogenesis in ICR mice. On the other hand, additional supplement of AA via drinking water has a protective effect against the colon carcinogenesis. The related mechanisms need to be illustrated by further studies in future.

Globally, colon cancer is increased gradually and known as one of the major causes of cancer death. Stevia, a substitute of sugar, is known to have many components including alpha-tocopherol and anthocyanin etc, as antioxidants. This study's purpose is to investigate whether stevia plant extract can have a protective effect against colon carcinogenesis induced by azoxymethane (AOM) and dextran sodium sulfate (DSS) in mice. Total 30 male ICR mice were divided into 2 groups; AOM/DSS treatment (control group), AOM/DSS + stevia extract (0.5%, in drinking water). After acclimation for 1 week, five weeks old mice received three intraperitoneal AOM (10 mg/kg b.w.) injections weekly for 3 weeks (0–2nd weeks of the experiment) and 2% DSS as drinking water for the next one week. AIN-76A purified rodent diet and 0.5% stevia extract water were supplied to the animals for 6 weeks. The colons of mice were collected and the number of aberrant crypt foci (ACF) and aberrant crypts (ACs) in colonic mucosa were counted after staining with methylene blue. Malondialdehyde (MDA) concentration in feces were determined. The numbers of ACF and ACs were significantly (p<0.01) decreased in stevia-treated group compared with the control group. The MDA concentration in feces was also significantly (p<0.01) decreased in stevia-treated group compared with the control group. In histopathology of colonic epithelium, hyperplasia of colonic epithelium was less observed in steviatreated group. These results indicate that stevia has a protective effect against colon carcinogenesis induced by AOM/DSS in mice and further study needs to illustrate the protective mechanisms.

In this study, antibody responses after vaccination against equine influenza were investigated among 1,591 horses in the Republic of Korea using the hemagglutination inhibition (HI) test. Equine influenza has not occurred since 2011 and a commercial vaccine against H3N8 has been used. The equine influenza virus, A/equine/South Africa/4/03 (H3N8), was used as the antigen in the HI assay. The mean seropositive rate was 90.5% in 2019. Except for stallion whose seropositive rate was 78.5%, all seropositive rates of other horse types were over 90%. Regionally, except for Gangwon-do and Jeju-do whose seropositive rates were 89.0% and 87.1%, all seropositive rates in other provinces were over 90%. In the future, more through vaccination against equine influenza needs to be done based on this investigation result.

감성공학이라는 개념이 대두된 이래로 게임 산업에서도 감성적 성향에 기반한 게임을 개발하려는 움직임이 나타났다. 기존의 경쟁과 승리를 갈구하는 게임 방식에서 인간의 감성을 자극해 몰입을 유도하는 방식으로 전환된 것이다. 따라서 게임을 출시하기 전 개발단계에서 감성평가라는 시스템이 적용되었다. 감성 평가 시스템은 게임 인터페이스, 시스템 등의 사용성과 플레이어의 감성 욕구를 검증할 수 있는 평가 방법이다. 하지만 문항 선택 방식의 평가 방식으로는 평가자의 주관에 의존해야 한다는 단점이 있으며, 게임에 충분히 몰입을 했는지의 여부에 의해 평가자의 답변이 바뀔 수 있다는 문제가 있다. 특히 게임은 다른 미디어 콘텐츠에 비해 몰입성에 대한 영향을 크게 받는 편이며 몰입성은 수치를 통한 계량화가 힘들기 때문에 평가 대상으로 삼기 힘든 면이 있다. 이에 본 연구에서는 시선 추적 기술을 이용해 플레이어의 몰입도를 측정한 뒤 감성 평가를 실시하여 감성 평가의 신뢰성을 높이는 방법을 제안하고자 한다.