Molecular Identification and Real-time Quantitative PCR (qPCR) for Rapid Detection of Thelohanellus kitauei, a Myxozoan Parasite Causing Intestinal Giant Cystic Disease in the Israel Carp

Intestinal giant-cystic disease (IGCD) of the Israel carp (Cyprinus carpio nudus) has been recognized as one of the most serious diseases afflicting inland farmed fish in the Republic of Korea, and Thelohanellus kitauei has been identified as the causative agent of the disease. Until now, studies concerning IGCD caused by T. kitauei in the Israel carp have been limited to morphological and histopathological examinations. However, these types of diagnostic examinations are relatively time-consuming, and the infection frequently cannot be detected in its early stages. In this study, we cloned the full-length 18S rRNA gene of T. kitauei isolated from diseased Israel carps, and carried out molecular identification by comparing the sequence with those of other myxosporeans. Moreover, conventional PCR and real-time quantitative PCR (qPCR) using oligonucleotide primers for the amplification of 18S rRNA gene fragment were established for further use as methods for rapid diagnosis of IGCD. Our results demonstrated that both the conventional PCR and real-time quantitative PCR systems applied herein are effective for rapid detection of T. kitauei spores in fish tissues and environmental water.

Non-specific Defensive Factors of the Pacific Oyster Crassostrea gigas against Infection with Marteilioides chungmuensis: A Flow-Cytometric Study

In order to assess changes in the activity of immunecompetency present in Crassostrea gigas infected with Marteilioides chungmuensis (Protozoa), the total hemocyte counts (THC), hemocyte populations, hemocyte viability, and phagocytosis rate were measured in oysters using flow cytometry. THC were increased significantly in oysters infected with M. chungmuensis relative to the healthy appearing oysters (HAO) (P<0.05). Among the total hemocyte composition, granulocyte levels were significantly increased in infected oysters as compared with HAO (P<0.05). In addition, the hyalinocyte was reduced significantly (P<0.05). The hemocyte viability did not differ between infected oysters and HAO. However, the phagocytosis rate was significantly higher in infected oysters relative to HAO (P<0.05). The measurement of alterations in the activity of immunecompetency in oysters, which was conducted via flow cytometry in this study, might be a useful biomarker of the defense system for evaluating the effects of ovarian parasites of C. gigas.

The relationship between test anxiety and family adaptability, cohesion of high school students

BACKGROUND: As Koreans have had great enthusiasm for education traditionally, most students have excessive anxiety about tests and such anxiety may cause several physical and psychological problems. But there are few studies on the relationship between test anxiety and family function. Therefore, in this study, we tried to figure out the relationship between test anxiety and family function in order to treat and educate patients who have excessive test anxiety. METHODS: In a survey study, the Korean Version of Test Anxiety Inventory and Olson's FACES III was administered to the 220 second year high school students of a single high school who live in Pusan. Two groups of students with high and low test anxiety levels (52 in each group) were selected based on the test anxiety scale ratings and analysis of their family adaptability and cohesion. RESULTS: In FACES III adaptability of high test anxiety group, there were 15 cases (28.8%) for rigid, 23 cases (44.2%) for structured, 11 cases (21.2%) for flexible and 3 cases (5.8%) for chaotic familes. In that of low test anxiety group, 2 cases (3.8%) for rigid, 16 cases (30.8%) for structured, 24 cases (46.2%) for flexible and 10 cases (19.2%) for chaotic familes. In FACES III cohesion of high test anxiety group, there were 2 cases (3.8%) for disengaged, 14 cases (26.9%) for separated, 20 cases (38.5%) for connected and 16 cases (30.8%) for enmeshed familes. In that of low test anxiety group 18 cases (34.6%) for disengaged, 22 cases (42.3%) for separated, 8 cases (15.4%) for connected and 4 cases (7.7%) for enmeshed familes. In FACES III family type of high test anxiety group, there were 24 cases (46.2%) for balanced, 20 cases (38.4%) for mid range and 8 cases (15.4%) for extreme familes. In that of low test anxiety group 24 cases (46.2%) for balanced, and 22 cases (42.3%) for mid range and 6 cases (11.5%) for extreme familes. CONCLUSION: Cohesion scale of high test anxiety group was higher than that of low test anxiety group and adaptability scale of low test anxiety group was higher than that of high test anxiety group.