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북방전복 Haliotis discus hannai에 대한 유해 적조생물 Karenia mikimotoi의 위해성 평가
이상준,조규태,옥하나,최혜승,박영태,손문호 한국패류학회 2018 The Korean Journal of Malacology Vol.34 No.2
Karenia mikimotoi bloom is known to damage abalones via chemical toxicity, but the toxic mechanism remains unclear. In an attempt to gain an insight into its damage potential to abalone spats Haliotis discus hannai, the spats were exposed to 0, 10, 50, or 100% of 7,500 cells ml-1 K. mikimotoi in types of ICS (intact cell suspension), BCS (broken cell suspension) or CFE (cell-free elutriate) at 13 and 18℃, respectively. The spats were also exposed to corresponding type and dilution of 7,500 cells ml-1 Cochlodinium polykrikoides and 2,000 cells ml-1 Alexandrium affine which were equivalent to 7,500 cells ml-1 K. mikimotoi on the basis of TOC (total organic carbon). K. mikimotoi was proved to be damageable to the spats with damage potential not bigger than A. affine and C. polykrikoides. In algal type, ICS was most influential, particularly in lower dilutions (with an occasional significance of p < 0.01 or p < 0.05), suggesting that toxicity potential might be more associated with intact cell membrane. Overall, the spat damages of experimental trials were in concurrence with those of controls which were solely due to culture stress, suggesting that the culture stress might be an additional parameter influencing the spat damage and thus should be countered into consideration in future study.
남상익,최유덕,김광준,김재남,노경연,김유찬,손문옥 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.9
무심쌍태아는 주로 일란성쌍생아에서 발생하는 드문 기형으로 쌍태아간의 역류된 동맥관류에 기인한다. 저자들은 산전에 진단된 1예의 무심쌍태임신을 최근 경험하였기에 간단한 문헌 고찰과 함께 보고하는 바이다. The acardiac anormaly is a rare complication of monozygotic twin pregnancies. It is associated with twin reversed arterial perfusion (TRAP) sequence. We experienced a case of acardiac twin prenataly diagnosed by ultrasonography, so we present this case with a brief review of the literature.
Internal structure and materials of the Yangsan fault, Bogyeongsa area, Pohang, South Korea
김창민,한래희,정기영,정종옥,손문 한국지질과학협의회 2016 Geosciences Journal Vol.20 No.6
The internal structure and materials of a fault are crucial to understanding its mechanical and fluid flow behaviors because they are interrelated. The Yangsan fault is a major strikeslip fault in SE Korea, and its possible reactivation has been an issue of great interest and debate. However, the internal structure of the fault has not been extensively studied; one reason for this is the scarcity of the fault outcrop. Based on field observations and materials analysis, here we report the characteristics of the internal structure and the materials of the fault in the Bogyeongsa area, where a new outcrop showing the entire section of the fault is found. The fault is composed of a core zone (9−10 m in thickness) and surrounding damage zones (>200 m in thickness). The core zone has two subzones: one is an ~8–9-m thick alternating blue and purple gouge zone (BPZ) and the other is an ~0.5-m thick brown gouge zone (BZ). The former exhibits large fractured lenses and anastomosing gouges, and the latter has a strong network of foliation. Given the smaller content and size of clasts in the BZ than in the BPZ, it follows that larger fault displacement was accommodated in the BZ than in the BPZ. The damage zones around the core zone are characterized by dense fractures and veins and subsidiary faults of multiple generations. According to an analysis of the materials, the core zone gouges are clay-rich (>50 wt%). The BPZ is enriched in illite and chlorite, whereas the BZ is enriched in smectite, which has a notably low frictional strength when wet. Given the occurrence of the Quaternary slip faults in the damage zone of the Yangsan fault in other areas, further studies of the materials and mechanical properties on both the main core zone and the subsidiary faults in the damage zones are necessary to determine which is likely to be reactivated seismogenically under the current stress field.