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김구환 ( Kgu Hwan Kim ),안승주 ( Seung Ju Ahn ),김수정 ( Su Jung Kim ),박희천 ( Hee Cheon Park ) 한국환경생물학회 2013 환경생물 : 환경생물학회지 Vol.31 No.4
대구의 동남부지역에 위치한 망월지에서 2007년부터 2009년 사이에 일어난 두꺼비 유생의 집단폐사에 관한 연구이다. 망월지두꺼비를 대상으로 미생물학적 조직학적 검사를 시행하여 Aeromaona hydrophila를 분리해낼수 있었다. A. hydrophila는 수계환경에 광범위하게 분포하는 기회감염균이다. 2007년~2009년 상승된 기온변화가 망월지내의 수온을 상승시킴으로서 어패류 및 양서류의 병원성 세균인 A. hydrophila의 급속한 증식이 유발되어 두꺼비유생을 감염시켜 집단폐사로 이어진 것으로 사료된다. We have confirmed the first case of mass mortality which occurred in the wild populations of larval toad, Bufo bufo gargarizans during 2007~2009 at Mangwel pond, which is a long time breeding site, and is located at the south eastern area in Daegu. We have investigated through microbiological tests the cause of mass decease of the larval toad, and detected numerous bacteria from the intestine by histological examines and cultures. The pathogen isolated from the infected larval toads has been identified as Aeromonas hydrophila, which is widely distributed in aquatic environment. However, this phenomenon of mass lethal pattern of the larval toad disappeared at the breeding pond after maintaining better water levels and low temperature in spring during breeding season in 2010. We propose that the high temperatures during the 2007~2009 breeding season resulted in lower water levels and drier conditions leading to explosive propagation of A. hydrophila in the pond which impacted the larval toad`s immune function.
한국산 넙치(Paralichthys olivaceus) 정자의 미세해부학적 구조
김구환 ( Kgu Hwan Kim ),이병찬 ( Byung Chan Lee ),남명모 ( Myung Mo Nam ) 한국어류학회 2011 韓國魚類學會誌 Vol.23 No.2
한국산 넙치(Paralichthys olivaceus) 정자의 미세해부학적구조를 관찰한 결과 첨체가 없고, 두부는 둥글고, 중부는 작으며 단편모로 이루어져 있었다. 넙치정자의 구조는 경골어류의 일반적인 특징이나 형태 및 세포소기관의 미세구조에서 종간에 차이가 나타난다. 본 종의 정자는 5개의 미토콘드리아가 한 층으로 중편에서 중심립을 둘러싸고 있고, 말단부중심립과 관련된 9개의 구조물이 나타났다. 편모는 기부가 핵에 삽입되어 있고, 양측면으로 막이 확장되어 있었다. 이러한 특징은 경골어류의 종 분류와 계통학적 연구에 중요한 요소가 된다. Fine structure of spermatozoa of the bastard halibut (Paralichthys olivaceus) is described. Its structure is characterized by acrosomeless, having a spherical head region and a small midpiece containing five mitochondria disposed one row. The flagellum inserts centrally on the nucleus and has lateral ribbons. The present study supports the suggestion that spermatozoal ultrastructure is of taxonomic importance and may be a phylogenetic criterion in teleostei.
한국산 모래무지아과 ( 잉어과 , 경골어강 ) 어류 정자의 미세구조와 계통학적 연구 2. 참몰개 Squalidus chankaensis tsuchigae 정자의 미세구조
김구환(Kgu Hwan Kim),권애숙(Ae Sook Kwon),이영환(Young Hwan Lee) 한국하천호수학회 1998 생태와 환경 Vol.31 No.3
The spermatozoon of Squalidus chankaensis tsuchigae was approximately 32㎛ in length and a relatively simple cell composed of a nucleus, a short midpiece and a tail. The acrosome was absent as in most teleost fishes. The nucleus was spherical and contained the region of an electron lucent chromatin distinguished from the electron dense chromatin occupying most of the nucleus. The electron lucent chromatin showed the common feature of Squalidus. The nuclear fossa was located at the lateral side of the nucleus and contained the proximal centriole. The proximal and distal centrioles were oriented at approximately 130˚to each other. The tail was positioned tangentially to the nucleus. The asymmetrical distribution of the mitochondria and the eccentrical position of the tail with regard to the nucleus are the common character of cyprinid species. However, there are differences between S. gracilis majimae in arrangement and number of the mitochondria. In S. chankaensis tsuchigae, the mitochondria had two aspects of the ring or C-shape and the separate structure. From the aspects of sperm evolution the fused mitochondria of S. chankaensis tsuchigae spermatozoa are considered as the apomorphic character in comparison with the separate mito-chondria in S. gracilis majimae spermatozoa.
분화성 갑상선암환자의 방사성 요오드 치료시 전리함과 Geiger-Muller계수관에서 방사선량률 측정값 비교
박광훈(Kwang-hun Park)김구환(Kgu-hwan Kim) 대한방사선과학회(구 대한방사선기술학회) 2016 방사선기술과학 Vol.39 No.4
방사성 요오드(131I) 치료는 분화성 갑상선암 환자에서 재발을 감소시키고 생존률을 증가시키나, 환자에서 방출 되는 방사능으로 인하여 피폭을 야기시킬 수 있으므로 환자로부터 발생되는 방사선량률을 측정하는 것이 방사선안 전관리 측면에서 중요하다. 방사성 요오드(131I) 치료시 널리 사용되는 측정기 중 전리함과 GM계수관으로 측정된 방사선량률의 감도와 측정효율을 구하였다. 방사성 요오드(131I)를 150mCi 경구투여 받은 분화성 갑상선암 환자의 상복부로부터 1 m거리에서 경과 시간에 따라 방사선량률을 측정하였다. 시간에 따른 변화를 직접적으로 비교한 결과, 고선량률에서의 감도와 측정효율은 GM계수관보다 전리함이 높게 나타났고, 통계적으로 유의하였다(p<0.05). 저선량률에서의 감도와 측정효율은 GM계수관보다 전리함이 낮게 나타났지만 통계적으로 유의한 차이를 나타내지 않았다(p>0.05). 방사성 요오드(131I) 치료시에 검・교정이 완료된 전리함과 GM계수관으로 정확하고 신속한 방사선 량률을 측정하여 환자에게 설명함으로써 방사성 요오드 치료 후 퇴원하는 환자에게 환자가족 또는 주변 사람들에 게 미칠 수 있는 방사선피폭을 예측하고, 불필요한 예단을 줄여줄 수 있을 것이다. Radioactive iodine(131I) treatment reduces recurrence and increases survival in patients with differentiated thyroid cancer. However, it is important in terms of radiation safety management to measure the radiation dose rate generated from the patient because the radiation emitted from the patient may cause the exposure. Research methods, it measured radiation dose-rate according to the elapsed time from 1 m from the upper abdomen of the patient by intake of radioactive iodine. Directly comparing the changes over time, high dose rate sensitivity and efficiency is statistically significant, and higher chamber than GM counter(p<0.05). Low dose rate sensitivity and efficiency in the chamber had lower levels than gm counter, but not statistically significant(p>0.05). In this study confirmed the characteristics of calibrated ionization chamber and GM counter according to the radiation intensity during high-dose radioactive iodine therapy by measuring the accurate and rapid radiation dose rate to the patient explains, discharged patients will be reduced to worry about radiation hazard of family and others person.
도롱뇽(Hynobius leechii) 정충의 미세구조(Amphibia, Urodela)
김구환,박원학,이영환,Kim, Kgu-Hwan,Park, Won-Hark,Lee, Young-Hwan 한국현미경학회 1995 Applied microscopy Vol.25 No.1
The ultrastructure of spermatozoa in Hynobius leechii was examined with transmission electron microscope and compared with those of other urodeles and anurans. The perforatorium and the tail show most of the common feature of urodeles. However, there were several ultrastructural characteristics in an acrosome, nucleus, neck, axial rod and mitochondria related to the nucleus. The acrosome was trifoliate in transverse sections and the perforatorium consisted of two different concentric parts with a fine sharp point in a subacrosomal lumen. The nucleus consisted of two different regions of chromatin area and nuclear ridge. The nuclear ridge was composed of several bundles of five to ten minute tubular subunits of 19 nm diameter in this species, while in higher urodeles it was well developed in multi layers. The protoplasmic bead was separated by a cytoplasmic canal except the connection with only the distal portion of the nucleus. The neck was a short cylinder and contained pericentriolar material with transverse striations. In Hynobius the ring was not elongated to the tail and the mitochondria were distributed only in the protoplasmic bead around the nucleus as in Cryptobranchus, while in higher groups of urodeles it elongates to the length of the middle piece and the mitochondria follow the ring. The ring elongation may be related to the distribution of mitochondria. Hynobiidae and Cryptobranchidae are closely related based on structure of neck, the axial rod and location of mitochondria, although they are different in the composition of the axial rod.