• Parasites, Hosts and Diseases
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• 제52권4호
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• pp.443-447
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• 2014

Babesiosis is an emerging tick-borne disease in humans worldwide; however, little is known about the frequency of infection or prevalence of this disease in other parts of the world, excluding North America. In this study, we aimed to investigate Babesia microti infection frequency in a human population in Mongolia. One hundred blood samples were collected from stock farmers living in Khutul city of Selenge province, Mongolia. The sera and DNA from blood samples were evaluated for the presence of B. microti infection by using indirect fluorescent antibody (IFA) tests and PCR. The positive detection rates obtained using the IFA tests and PCR assays were 7% and 3%, respectively. This study is the first to detect of B. microti infections based on antibody seroprevalence or PCR assays for the presence of B. microti DNA in a Mongolian population.

• 대한수의학회지
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• 제54권3호
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• pp.147-150
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• 2014

Q-fever is a vector-borne (Coxiella [C.] burnetii) zoonotic disease that is an increasing public health concern. To date, some research about Q-fever prevalence in dairy herds and human patients has been reported in Korea, but information about Korean native cattle is scarce. To measure the prevalence rates of C. burnetii in Korean native cattle, a total of 1,095 bovine serum samples collected during 2010~2013 were analyzed with an enzyme-linked immunosorbent assay. Sixty-eight heads of cattle were diagnosed as positive and while 19 heads were suspected (positive rate = 6.2%). Interestingly, Jeju province had a seropositivity rate six times greater than that of other provinces (18.9% vs. 3.2%). High seroprevalence might be caused by wide distribution of ticks in Jeju province compared to other regions. Based on these data, extensive monitoring of C. burnetii infection in cattle, tick distribution, and climate changes is required.

• Parasites, Hosts and Diseases
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• 제56권3호
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• pp.287-290
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• 2018

Anaplasmosis is a tick-borne, non-contagious, zoonotic disease caused by Anaplasma spp., which include Anaplasma marginale, A. centrale, A. phagocytophilum, A. platys, A. ovis, and A. bovis. Recently, in Korea, the prevalence of Anaplasma spp. has been investigated in some animals, such as dogs, horses, goats, cats, and Korean water deer. In cattle, A. marginale is the most virulent species and regarded as the typical type of species. However, data on the seroprevalence of Anaplasma spp. in cattle in Korea during the last decade is limited. This study was designed to investigate the seroprevalence of bovine anaplasmosis in Korea. From 2010 to 2013, blood samples were collected from 568 cattle. Forty animals (7.0%) tested seropositive for Anaplasma spp. by cELISA. Despite that current bovine anaplasmosis seropositivity rate in the Gyeongsangbuk-do is lower than those in tropical countries, anaplasmosis needs to be regarded as a concerning disease. The identification of the specific Anaplasma species infecting cattle in this province requires additional molecular studies. Moreover, further monitoring and control programs for bovine anaplasmosis is required, and the information from this study will be beneficial to develop these programs.

• 한국동물위생학회지
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• 제36권4호
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• pp.243-248
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• 2013

Q fever is a rickettsial infection caused by Coxiella burnetii that is transmitted from animals to humans. Modes of transmission to humans include inhalation, tick bites and ingestion of unpasteurized milk or dairy products. This survey was aimed at monitoring the seroprevalence of C. burnetii in bulk-tank milk (BTM) in Gyeongbuk province. In addition, the seroprevalence of C. burnetii was investigated at the herd level of dairy cattle in eastern Gyeongbuk province in which many dairy cattle are reared. Among 324 BTM samples collected from 20 country areas, 175 (54%) BTM samples from 15 (75%) country areas were positive for C. burnetii by ELISA. By regions, the seroprevalence of BTM samples in eastern, central, western and northern areas of Gyeongbuk province were 62.7%, 48.4%, 45.1%, and 41.4%, respectively. When analyzed in the dairy cattle reared in the eastern area where high seroprevalence occurred in BTM samples, 119 (24.2%) out of 492 dairy cattle were positive for C. burnetii. Seroprevalence of C. burnetii in dairy cattle was increased with daily milk yield of farm (P<0.05) and age (P<0.001). Since seroprevalence of C. burnetii is relatively high in both BTM samples and dairy cattle reared in Gyeongbuk province, further studies on the high risk farms and herds are needed to evaluate infection status and appropriate control programs in this region.

• 대한수의학회지
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• 제35권1호
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• pp.137-142
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• 1995

Anaplasmosis is a tick-borne disease of large and small ruminants, causing losses through mortality, abortion, weight loss and reduced milk production. In one dairy farm, for example, 250 of a total of 800 imported goats were diagnosed with a mysterious type of anemia during the summer and autumn of 1992. The etiologic agent was identified as Anaplasma spp by acridine orange and ultrastructure by electron microscopy. In order to monitor variations in blood biochemical and hematological parameters associated with the disease, blood samples were collected by jugular venipuncture from 50 goats at 3 month intervals between the period of February and October, 1993. The levels of RBCs, HB and HCT decreased from $18.48{\pm}1.96$ to $13.47{\pm}2.48X10^6/mm^3$, $12.25{\pm}1.41$ to $9.54{\pm}1.77g/dl$, and $43.09{\pm}4.75$ to $30.93{\pm}5.78%$, respectively. The values of MCH(Mean corpuscular hemoglobin), MCHC(Mean corpuscular hemoglobin concentration) and PLT(Platelet) were elevated from $6.58{\pm}0.30$ to $7.05{\pm}0.47pg$, $28.40{\pm}1.20$ to $30.82{\pm}1.85g/dl$ and $1688.34{\pm}750$ to $2046.82{\pm}783X10^3/mm^3$, respectively. Percent parasitized erythrocytes(PPE) increased from $0.61{\pm}0.5$ to $2.22{\pm}1.9%$, clinical biochemical parameters aspartate aminotransferase and alanine aminotransferase were $66.64{\pm}23.1K.U$ and $14.90{\pm}6.59K.U$, respectively and persisted at high levels throughout the observation period. The level of albumin(2.46)0.52 g/dl) was decreased corresponding to an elevated globulin and a reduced albumin/globulin ratio in October as compared with the values in February. It is concluded that caprine anaplasmosis may be an important cause of anemia and hepatic malfunction in goats.

• Parasites, Hosts and Diseases
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• 제23권2호
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• pp.313-323
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• 1985

우리나라 소와 양에 많이 기생 분포하고 있는 Boophilus microplus 진드기의 암놈 성충에 대한 표면 미세구조를 관찰해보고자 주사전자현미경(Model; SEM ISI-DS-130)을 사용하였으며, 영상관찰 및 사진분석 결과 얻어진 형태학적 특징을 요약하면 다음과 같다. 1. 촉수는 길이보다 폭이 넓으며, 전후방으로는 단축되고, 배측방으로는 융기되어 있는 모습을 나타낸다. 촉지에는 흔히 4쌍의 복내측 강모를 가지고 있다. 2. 치열에 있어서의 치식은 대부분 4/4로 표기 되지만 때때로 5/5를 보이는 경우도 있다. 3. 구하편은 배방으로 향한 육각형 모양을 나타내며 잘 발달된 다공역을 볼 수 있다. 4. 자충 성충의 생식기 주변에 생식공을 향하여 펼쳐져 있는 지문양의 수많은 주름을 볼 수 있다. 5. 항문에 있어서는 잘 발달된 강모 1개씩을 가지고 있는 1쌍의 항문내엽을 특징적으로 관찰할 수 있었다.

• 한국자기학회지
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• 제23권1호
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• pp.12-17
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• 2013

금속 분말 니켈(Ni)을 HCl용액에 용해시킨 후 $H_3BO_3$, KOH을 첨가하여 Chloride 도금용액을 제조 후 Ni plate 기판에 도금하였다. 도금두께는 $3{\mu}m$로 일정하게 유지하였다. 전류밀도를 $1{\sim}30mA/cm^2$ 변화를 준 결과 전류밀도를 증가시킬수록 Ni 후막표면이 거칠어졌다. $25mA/cm^2$와 $30mA/cm^2$에서는 균열된 표면형상을 관찰하였다. 또한 XRD patterns 변화를 관찰한 결과 전류밀도가 증가할수록 FCC(111)과 FCC(220) 및 FCC(311)상의 강도는 증가한 반면 FCC(200)상의 강도는 감소하는 것을 관찰하였다. 전기도금된 Ni의 수평 및 수직 자화 값을 측정하였는데 기판에 의한 수평자화 값이 크게 나왔고, 코팅층 두께가 증가할수록 수직자화 값이 커지는 것을 확인하였다.

• 천문학논총
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• 제30권2호
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• pp.447-449
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• 2015

Although the link between activity in the nuclei of galaxy and galactic mergers has been under scrutiny for several years, it is still unclear to what extent and for which populations of active galaxies merger-triggered activity is relevant. The environments of AGN allow an indirect probe of the past merger history and future merger probability of these systems, suffering less from sensitivity issues when extended to higher redshifts than traditional morphological studies of AGN host galaxies. Here we present results from our investigation of the environment of radio selected sources out to a redshift z=2. We employ the first data release J-band catalog of the new near-IR Infrared Medium-Deep Survey (IMS), 1.4 GHz radio data from the Faint Images of the Radio Sky at Twenty-cm (FIRST) survey and a deep dedicated VLA survey of the VIMOS field, covering a combined total of 20 sq. degrees. At a flux limit of the combined radio catalog of 0.1 mJy, we probe over 8 orders of magnitude of radio luminosity. Using the second closest neighbor density parameters, we test whether active galaxies inhabit denser environments. We find evidence for a sub-population of radio-selected AGN that reside in significantly overdense environments at small scales, although we do not find significant overdensities for the bulk of our sample. We show that radio-AGN in the most underdense environments have vigorous ongoing star formation. We interpret these results in terms of the triggering and fuelling mechanism of radio-AGN.

• 한국초지조사료학회지
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• 제17권3호
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• pp.213-222
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• 1997

This study was carried out to investigate the reproduction efficiency and disease of Holstein heifer grazed on mixed pasture desighed with association of tall fescue and white clover cultivar (3 treatments = TI : Tall fescue Fawn + White clover Regal + Orchardgrass + Perennial ryegrass, T2 : Tall fescue Roa + Ladino clover Regal + Orchardgrass + Perennial ryegrass, T3 : Tall fescue Roa + White clover Tahora + Orchardgrass + Perennial ryegrass) on reproduction efficiency and disease in Holstein heifers, ftom April 1994 to November 1996. The results are as follows: 1. Erythrocyte counts, hemoglobin and packed cell volume of hematological values were $8.12\times10^6/{\mu}\ell, 9.9g/m\ell and 30.6m\ell/100m\ell$ respectively. While those were decreased to $4.84~5.93 \times10^6/{\mu}\ell, 7.0~7.8g/100m\ell and 22.8~28.3m\ell/100m\ell$, on pastuage (May-August), WBC counts was increased from $14.4\times10^3/{\mu}\ell to 14.0~18.3 \times 10^{3/\mu\ell}$ on pasturage. No significant differences were detected among the treatments on pastures. 2. Parasitemia levels increased to $14.0\pm8.2$(parasite/1,000rbc) at 1 month after pasturage. 3. At the occurrence of tirst estrus and conception, the average age of the Holstein heifers was $14.3\pm1.9$ and $17.4\pm1.5$ months, respectively, and the average interval of estrus cycle was $20.6\pm1.0$ days. Howerer, there was no significant difference on reproductive efficiency among 3 treatments. 4. The outbreak of diseases were tick bane disease, pink eye, pneumonia, mastitis, gastroentitis, waterpoisoning ringworm papillon and atosis during pasturage period(may-october). These diseases were showed no significant difference among 3 treatments. 5. In conclusion, there are no significant difference on the reproductive effeciency and disease outbreak among three treatments.

• Parasites, Hosts and Diseases
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• 제58권2호
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• pp.161-171
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• 2020

The ticks feed large amount of blood from their hosts and transmit pathogens to the victims. The salivary gland plays an important role in the blood feeding. When the female ticks are near engorgement, the salivary gland gradually loses its functions and begins to rapidly degenerate. In this study, data-independent acquisition quantitative proteomics was used to study changes in the phosphorylation modification of proteins during salivary gland degeneration in Haemaphysalis longicornis. In this quantitative study, 400 phosphorylated proteins and 850 phosphorylation modification sites were identified. Trough RNA interference experiments, we found that among the proteins with changes in phosphorylation, apoptosis-promoting Hippo protein played a role in salivary gland degeneration.