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Myeong-Lyeol Lee,Yong Soo Choi,Won Tae Kim 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
Varroa destructor Anderson & Trueman is the most injurious parasitic pest of honeybee in the world. Varroa mites had been originally external parasites of Asian honeybee (Apis cerana Fab.) in south eastern Asia. They jumped to European honeybees (Apis mellifera L.) by 1963. Since then they have killed millions of European honeybee colony, which might be susceptible to them, in Asia, Europe, America, and Africa. Also in Korea since Varroa mites were first found in 1968, they have been destructive pests in most of A. mellifera apiaries. Varroa destructor commonly infesting the European honeybees was classified in 2000 as a different species from the Varroa jacobsoni originally identified on Asian honeybees. Varroa mites not only feed the haemolymph of bees, but also introduce virulent viral diseases, and interrupt the development of bee colony. The other external parasitic mite, Tropilaelaps clarea Delfinado & Baker, which was introduced in 1994 from China, has widely spread and also brought damages on honeybees.
Patterning of Periodic Ripples in Monolayer MoS2 by Using Laser Irradiation
Sung Won Kim,Jeong Hyeon Na,Won Lyeol Choi,Hyun-Jong Chung,Sung Ho Jhang,Soo Ho Choi,Woochul Yang,Sang Wook Lee 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.10
We have investigated the effect of laser irradiation on monolayer MoS2 and observed the swellingup of the monolayer from the SiO2 substrate upon laser illumination. The mismatch in the thermal expansion between the substrate and MoS2 can result in the structural deformation. Employing this method, one can induce structural deformation in a desired pattern, and one can demonstrate the patterning of periodic ripples in monolayer MoS2 by using laser irradiation. The controlled fabrication of the ripple structure may be instrumental in understanding the effect of ripples on the interesting physical properties of monolayer MoS2.
Sung Won Kim,Jeong Hyeon Na,Won Lyeol Choi,Hyun-Jong Chung,Sung Ho Jhang 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.9
We have investigated the current distribution between individual layers of multilayer MoS2 in a field-effect transistor structure with source and drain electrodes on the top layer. By employing a laser thinning technique, we partially etched down the multilayer in the middle of the device and monitored the electrical current after each etching step. The current was decreased by several orders of magnitude when the upper layers were partially etched away. Our observation suggests that the electrical current of multilayer MoS2 flows mainly through the upper layers close to the source/drain contacts due to relatively large interlayer resistance of MoS2.
김원호,박인서,송시영,최흥재,이홍렬,이상인 대한소화기내시경학회 1989 Clinical Endoscopy Vol.9 No.2
Gastric pseudolymphoma can be defined as a benign proliferation of lymphoid tissue and is also called the lymphoid hyperplasia or reactive lymphoreticular hyperplasia of the stomach. This lesion has been described in the orbital area, skin, salivary glands, mediastinum and other organs. The etiology of this disease is unknown but chronic inflammation and ulceration have been proposed as the etiologic mechanism in many cases. Most patients exhibit chronic, nonspecific, mild symptoms with the vast majority having symptoms for more than 1 year before undergoing diagnosis and treatment. Unfortunately, upper GI radiography rarely clarifies the diagnosis and gastroacopy is ineffective in establishing the diagnosis of pseudolpnphoma. Therefare, gastric resection is the only sure way to diagnose gastric pseudolympboma, as well as providing curitive therapy in most cases because of its possible malignant potential. There is no typical gross appearance of gastric pseudolymphoma and histologic diagoosis is essential. Smaller tumor size, infiltration with small, round mature lymphoeytos and various inflammatory cells, and formation of a true lymphoid germinal center favor a diagnosis of pseudolymphoma, We report 3 cases of histopathologically confirmed gastric pseudolymphoma after gastrectomy, which were initially suspected to be gastric lymphoma and early gastric cancer
사과나무의 잔류 살충제 아세페이트 접촉 후 꿀벌의 외부 증상
이명렬(Myeong-Lyeol Lee),최경희(Kyung-Hee Choi),이순원(Soon-Won Lee),김진배(Jin-Bae Kim) 한국양봉학회 2008 韓國養蜂學會誌 Vol.23 No.4
Toxic symptoms of honeybees from the insecticide acephate, which frequently used in apple orchards, were evaluated. We examined physical abnormalities from contact with residues on 1st, 3rd, and 5th day after acephate or mixture of acephate with spreader-sticker and microbicide were sprayed on apple trees. The extended tongue, unfolded wing hooks (detached fore and hind wings), and asymmetric three pair legs could be observed as physical symptoms by toxicity. From contact with residual acephates (203.8±13.8 ppm) on 1 day after spray, 28%~60% of total bees appeared to extend their tongues, which was significantly higher proportion than untreated bees. 28%~33% of worker bees detached their fore and hind wings which were higher than that of unsprayed bees, 10%. The bees showing asymmetric legs were so few on sprayed apple leaves that it seemed to not affected by residual acephates. When honeybees contacted with residual acephates (150.1±7.3 ppm) for 24 hours on three days after spray, the proportion of extended tongue was 42% in acephate sprayed tree, which was significantly higher than that of bees in unsprayed trees. The abnormalities of wings and legs from sprayed trees were not significantly different from unsprayed tree. The residual acephate on five days after spray was 109.1±55.1 ppm, from which the mortalities of bees were below 5% and proportions of abnormal tongue and wings were 1~6% and 3~11%, respectively. The proportion of extended tongues among honeybees was related with residual chemical amount and bee mortality, and was the most distinct physical symptom among three abnormal features observed.
Research of Sugar from Vegetables to Supply Carbohydrate Sources to Honeybee, Apis mellifera
Yong-Soo Choi,Myeong-Lyeol Lee,Man-Young Lee,Hye-Kyung Kim,Eun-Jin Kang,Dong-won Kim,Jung-Eun Kim 한국양봉학회 2017 韓國養蜂學會誌 Vol.32 No.4
Honeybees (Apis mellifera) are well-known for their elaborated division of worker with each bee performing a series of social mission. Colony organization is based on age-dependent division of worker. Honeybees performed several mission: nursing, cleaning or sealing brood cells, producing honey, collect pollen and nectar. The nectar is carbohydrate source for making energy. Korea has a very short blooming season for producing honey due to climate condition. So, almost Korean beekeepers have been supplied sugar syrup to honey bee for their carbonate source. Unfortunately, recently, the price of sugar has risen so much that the production cost of beekeeper has risen. We are extracted several sugars from plants for using carbohydrate source to bee. 3 sugar sources were extracted from plants (watermelon, cabbage, and mandarin). Almost sample showed high level of insecticidal rate and low level feed intake rate. We were selected 2 type of cabbage sugar syrup that low level insecticidal rate and high level feed intake rate (No. 6 cabbage (+fructose) was mixed with 10% fructose and No. 7 cabbage (+pollen) was made with 10% pollen). Cabbage sugar solution has much more impurities than purified sugar. So, No. 6 and No. 7 sample can do up-regulation of antimicrobial genes (apideacin, defencin, abacin, and hymenopteacin). Cabbage sugar solution has much more impurities than purified sugar. Our results suggest that up-regulation of antimicrobial genes might be involved in worker through carbohydrate impurities related immune pathways.
Comparison of naturally mated and artificially inseminated Apis cerana queen
Yong Soo Choi,Nguyen Ngoc Vung,Myeong Lyeol Lee,Hye Kyung Kim,Dong Won Kim 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04
Control mating is important aspect in bee breeding programs. The technique of artificial insemination is the possible one that can surely control mating of the selected drones with the virgin queen. This is the first time applied artificial insemination technique to control mating of A. cerana in Korea. Altogether 18 queens were artificially inseminated, and 2,000 drones of Korean A. cerana were used to evaluate amount of semen collection. Semen of A. cerana is much difficult to separate from mucus in comparing with A. mellifera. The average amount of semen can be collected from one A. cerana drone was 0.09 μl, whereas the A. mellifera was more than 6 times (0.58 μl semen per A mellifera drone). Obtaining 1 μl of semen have to collect from 11.94 drones that successful semen ejection and have to kill 17 A. cerana drones. Queens artificially inseminated with 4 μl of semen (once insemination) or 8 μl of semen (twice insemination, each with 4 μl of semen) started laying egg later than naturally mated queens 5.3 and 2.5 days, respectively. The onsets of oviposition of artificially inseminated queens were 12.5 to 15.3 days. Queens received twice inseminations started laying eggs 2.8 days earlier than those received only once insemination. Artificially inseminated queens produced exclusively brood and were similar as the naturally mated ones. The brood production of the queens received once insemination with 4 μl of semen was insignificantly different than those received twice inseminations or naturally mated ones, suggesting that one artificial insemination with 4 μl of semen is favorable.
Research of bio-Sugar from vegetables to supply carbohydrate sources to honeybee, Apis mellifera L.
Yong-Soo Choi,Myeong-Lyeol Lee,Man-Young Lee,Hye-Kyung Kim,Eun-Jin Kim,Dong-won Kim,Jung-Eun Kim,Soo-Eun Kang,Nguyen Ngoc Vung 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04
Honeybees (Apis mellifera) are defend on feeds for their larvae and adult bees` healthy life. The nectar is carbohydrate source for making energy. We are extract several sugars from plants for using carbohydrate source to bee. 3 sugar source was extracted from plants (watermelon, cabbage, and mandarin). Almost sample showed high level of insecticidal rate and low level feed intake rate. We were selected 2 type of cabbage sugar syrup that low level insecticidal rate and high level feed intake rate (No 6 cabbage(+fructose) was mixed with 10% fructose and No. 7 cabbage(+pollen) was made with 10 % pollen). Cabbage sugar solution has much more impurities than purified sugar. So, No.6 and No 7 sample can do up-regulation of antimicrobial genes (apideacin, defencin, abacin, and hymenopteacin). Cabbage sugar solution has much more impurities than purified sugar. Our results suggest that up-regulation of antimicrobial genes might be involved in worker through carbohydrate impurities related immune pathways.