• Parasites, Hosts and Diseases
• /
• v.30 no.3
• /
• pp.163-168
• /
• 1992

Hugot (1983), Hugot and Tourte-Schaefer (1985) reported that nematodes of the genus nnterobius causing human enterobiasis might be classified into two difEerent species on the basis of the size and shape of spicule in male worms. E. gregorii Hugot, 1983 has signif;cantly shorter spicules in males than those in E. vermicularis. A total of 194 male Enterobius were collected from 17 schoolchildren by anthelmintics at Wonju, Kangwon-do. The sizes of spicules and morphologies were comparatively observed. Two different types of spicules in male Enterobius were also observed in Korea. Out of 112 male worms observed, the percentages of E. gregorii (short-spicule type) and E. vermicularis (long-spicule type) were 23.2% and 76.8%, respectively.

• Parasites, Hosts and Diseases
• /
• v.32 no.1
• /
• pp.13-18
• /
• 1994

Chronic Clonorchis sinensis (CS) infection Is etiologically related to cholangiocarcinoma (CHCA) in human and animals. This study was carried out to clarify the role of CS Infection on dimethylnitrosamine (DMN)-induced cholanglocarcinogenesis. Fifteen hamsters were administered with 15 ppm DMN for 4 weeks and one week later, the hamsters were infected with 15 metacercariae of CS (DMN→CS group). The other 15 hamsters were infected with CS and after 5 weeks they were treated with the drug, praziquantel. Again one week later, the hamsters were administered with DMN (CS→DMN group). The other IS hamsters were adulnistered with DMN and CS simultaneously (CS + DMN group) . Histopathological examination of the livers showed CHCA with papillary or adenomatous hyperplasia of bile ductules in 3 of 15 hamsters of DMN→CS group and in 11 of 15 hamsters of DMN + CS group. These results suggest that CS infection to hamsters may have a promoting effect on the development of CHCA.

• Journal of Veterinary Clinics
• /
• v.26 no.4
• /
• pp.331-335
• /
• 2009

This paper was performed to investigate the propensity of the diameter of maximum distended urethra from urethra to os penis in mature male dogs of 25 male dogs of different breeds. The measured sites of urethras were divided into 7 regions, i.e. prostate, membrane, isthmus, perineum, scrotum, prescrotum and os penis. By using the inflated balloon catheter filled with contrast medium, the maximum diameter of the distended urethras of each region was recorded and compared among regions. The mean diameter of the lumen from the prostatic urethra to the os penis urethra was gradually narrowed except for the isthmus portion, with a sense of resistance for retraction being noted at the level of ischiatic arch in 22 dogs. Proposed results from this should be utilized as a predictor of a treatment plan for the removal of urethroliths using an urohydropropulsion.

• Korean journal of applied entomology
• /
• v.50 no.2
• /
• pp.115-123
• /
• 2011

Although Guleopdo is small island of only $1.71\;km^2$, the endangered butterfly species, Argynnis nerippe, is abundant there. This study was carried out to estimate the abundance of A. nerippe in Guleopdo, using quadrate, mark-recapture, and line-transect methods. Although the study was insufficient, the population size was estimated at 4,467 to 6,700 larvae and approx. 1,000 adults. A. nerippe was the most abundant among butterfly species in Guleopdo, and it comprised 32% of the total butterflies. A total of 28 butterfly species were observed in this study, and 3 species of these species were migrating species. When the abundance of A. nerippe throughout the country during the period from 1938 to 2010 was studied, we found that it decreased abruptly in the 2000s. Presently, A. nerippe inhabits a few locations in the mid-northern region and western islands. The relatively high numbers of A. nerippe in Guleopdo was due to conservation of natural grasslands and grazing of livestock, which provides adequate habitat for this species.

• Korean Journal of Environmental Biology
• /
• v.21 no.3
• /
• pp.257-261
• /
• 2003

Population of small mammals (Apodemus agrarius and Crocidura lasiura) was monitored to identify the bioaccumulation of heavy metals in Gumho river basin around Daegu city. The small mammals were captured during 28 of May~12 of June, 2002. The techniques of live-trapping and snap-trapping were applied to capture the animals. A total of 39 animals were captured among which 53.3% (16130) of population were reached to breeding. Heavy metals (Cu, Pb, Zn, Cd) were analyzed. According to the analysis of heavy metal elements, Zn was more accumulated in kidney (6.83 mg $kg^{-1}$) than in liver (3.66). However, the accumulation of Cu was higher in liver than in kidney. Even though this site was relatively away from major industrial zones, heavy metals were wide spread along the stream of Gumbo River. This is the first quantitative study of small mammal bioaccumulation of heavy metals in Korea so that further research should be followed in other industrial areas that heavy metals were widely dispersed.

• Journal of Mushroom
• /
• v.14 no.4
• /
• pp.197-201
• /
• 2016

During cultivation of Pluerotus ostreatus, there were happened several problems by mushroom flies. Many mushroom farms were faced with the problem that mushroom production periods became shorter by mushroom fly. In this study, we examined effect of Lycoriella ingenua on the production of P. ostreatus. When we used 10 adult flies at the time of inoculation, mushroom production decreased by 10.8% as compared to that of the control. And when L. ingenua used more than 20 adult flies, contamination occurred in all treatments. And when L. ingenua used at the time of P. ostreatus mycelium cultured during 14 days, it was confirmed that the yield of P. ostreatus decreased in proportion to the number of L. ingenua.

• The Korean Journal of Physiology
• /
• v.9 no.1
• /
• pp.57-61
• /
• 1975

A study was designed to clarify the influence of the hippocampus upon tolerance by electric shock. Forty-eight male rats were used, of which 14 rats had their hippocampal tissue on both sides removed through an opening in the parieto-occipital cortex (hippocampal group), 17 rats received damage to the parieto-occipital cortex only (cortical control group), and 17 rats served as normal control animals. After 24 hours' fasting with water ad libitum, each animal was restrained on a plate with added electric shock (4 mA A.C., 1.5 sec in a duration, and once per minute in average) to the tail for the last 24 hours without food and water. The mortality in each animal group and the mean survival time of the dead animal during the repitition of electric shock were calculated. Results obtained were as follows: 1. The mortality was lower significantly in the hippocampal group than in the two control groups. 2. The mean survival time of the dead animal was longer insignificantly in the hippocampal group than in the two control groups. The inference from the above results is that the hippocampus exerts a inhibitory influence upon tolerance by electric shock.

• The Korean Journal of Soil Zoology
• /
• v.8 no.1_2
• /
• pp.17-22
• /
• 2003

An endemic entomopathogenic nematode, Heterorhabditis megidis, was evaluated by its control efficacies against housefly, Musca domestica, and flower beetle, Gametis jucunda. In Petri-dish assay, the pathogenicity of H. megidis showed 456.4 infective juveniles/larva (IJs/larva) in median lethality (LC$_{50}$) against the second instar larvae of M. domestica and 238.9 IJs/larva against the second instar larvae of G. jucunda. This was contrasted with those of the other well-known entomopathogenic nematode, Steinernema carpocapsae, which showed 115.9 IJs/larva against M. domestica and 388.6 IJs/larva against G. jucunda. In field experiment, H. megidis were applied per square meter of pork farm with 1,000,000 IJs of H. megidis or apple orchard with 370,000 IJs, which were infested with M. domestica or G. jucunda, respectively. H. megidis showed 56.9% and 57.3% of control efficacies against M. domestica and G. jucunda, respectively. These results suggest a promising control technique in the field using H. megidis against M. domestica and G. jucunda.a.

• The korean journal of orthodontics
• /
• v.25 no.5 s.52
• /
• pp.587-592
• /
• 1995

The purpose of this study was to observe the pattern of bone remodellings in the periodontal ligament of dog, in which experimental tooth movement was performed A control and 5 experimental dogs, one and half year in age, were studied. Light force (50-75g) was applied by placing open-coil spring between left mandibular premolars ; heavy force (250-300g), between right mandibular premolars. Experimental dogs were sacrificed at 12 hours, 1, 3 ,7 and 14 days after force application, respectively. And soft X-ray films were obtained and read on the sectioned periodontal tissue around mandibular premolars. The results were as follows. 1. New bone formation began to be observed in tension side at 7-day and increased at 14-day , No difference was observed between light force group and heavy force group. 2. Bone resorption was observed as a shape of destruction of lamina dura at 3-day and increased gradually at 7-day, 14-day.

• Korean Journal of Ichthyology
• /
• v.17 no.2
• /
• pp.105-111
• /
• 2005

Most of the eggs and (or) pre-larvae of Acheilognathus signifer were observed from the gills of Unio douglasiae sinuolatus, 30~45 mm in the shell length, that is the host mussel of A. signifer. There was no selectivity in proportion to mussel size at the range observed. One to seven individual eggs and (or) pre-larvae were found in the mussels, with a mean of 2.5 individuals, and the rate of possessing one egg and (or) pre-larva was 50.0%. When the prelarva of A. signifer acquired swimming ability inside the mussel, it moved into the suprabranchial chamber. It was estimated that the growth period was 4~6 weeks. The minute tubercles of the pre-larvae were observed immediately after hatching. Absorption of the minute tubercles was observed starting the 7 th day, with most of tubercles absorbed 13 days after hatching and completed 20 days after the yolk was entirely absorbed.