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Jeon, Bo-Young,Kim, Seung-Cheol,Je, Sungmo,Kwak, Jeongyeon,Cho, Jang-Eun,Woo, Jong-Tae,Seo, Sangkyo,Shim, Hang-Sub,Park, Byoung-Ok,Lee, Sung-Sik,Cho, Sang-Nae Elsevier 2010 Research in veterinary science Vol.88 No.3
<P><B>Abstract</B></P><P>An enzyme-linked immunosorbent assay (ELISA) using bulk tank milk samples was evaluated as a screening test for bovine tuberculosis (TB), a contagious chronic disease of cattle. An ELISA with MPB70, a major antigen of <I>Mycobacterium bovis</I> was performed using paired sets of milk and sera samples from 33 tuberculin-positive and 43 tuberculin-negative cattle. Anti-MPB70 antibodies were detected in milk samples and there was a significant correlation between seroreactivities of milk and sera samples (<I>R<SUP>2</SUP></I>=0.83). Using the tuberculin skin test as the reference test, the sensitivities of ELISA using milk and sera samples were 87.8% and 81.8%, respectively, and the specificities were 97.7% and 100%, respectively.</P><P>In the screening test using bulk tank milk samples from 931 dairy herds in Whasung, Gyeonggi-do, Korea, the positive rate for anti-MPB70 antibody was 4.5% (42/931) and the tuberculin-positive rate was 2.8% (26/931). Individual milk samples (<I>n</I>=253) were collected from randomly selected 8 problematic and 3 negative herds (positive and negative in the screening test by MPB70 ELISA using bulk tank milk samples, respectively) and tested by MPB70 milk ELISA. In the problematic herds, positive rates were 10.5% (20/190) for anti-MPB70 antibodies in milk ELISA and 2.1% (4/190) in the tuberculin skin test. More than one dairy cows were positive by milk ELISA among the problematic herds, and all tuberculin-positive dairy cows were positive in the milk ELISA. Further, no positive cows were detected in negative herds both by milk ELISA and tuberculin skin test. These results suggest that an ELISA, using bulk tank milk samples, might be a potential efficient screening test for bovine TB of dairy cows.</P>
Electrical spin injection and accumulation in CoFe/MgO/Ge contacts at room temperature
Jeon, Kun-Rok,Min, Byoung-Chul,Jo, Young-Hun,Lee, Hun-Sung,Shin, Il-Jae,Park, Chang-Yup,Park, Seung-Young,Shin, Sung-Chul American Physical Society 2011 Physical review. B, Condensed matter and materials Vol.84 No.16
Fabrication of Calcined Clay Granule Comprising Zeolite
Byoung-Gon Kim(김병곤),Gye-Seung Lee(이계승),Chong-Lyuck Park(박종력),Ho-Seok Jeon(전호석),Soo-Bok Jeong(정수복) 한국토양비료학회 2008 한국토양비료학회지 Vol.41 No.4
제올라이트는 높은 양이온교환능력(CEC)으로 인해 토양개량제의 사용이 고려되어 왔으나, 이에 관한 연구들의 대부분이 제올라이트를 합성하거나 천연제올라이트의 CEC를 증가시키는데 국한되어왔다. 실제로 제올라이트를 토양개량제로 사용하기 위해서는 유실되는 것을 방지하기 위한 과립화 (granulation or pelletizing)가 요구된다. 본 연구는 제올라이트를 토양개량제로 활용하기 위해 이를 포함하는 소성점토의 과립 (calcined clay granule)을 제조하고, 제올라이트의 특성을 최대로 활용할 수 있는 과립의 제조조건을 찾으려 하였다. 천연제올라이트, 고령토, 규석을 재료로 하여, pan granulator와 high shear mixer granulator의 두가지 과립기를 사용하여 과립을 제조하였다. 재료의 혼합비와 과립기의 회전속도 등을 조절하여 과립을 제조하였으며, 이를 400~700℃범위에서 100℃단위로 소성한 후 파쇄강도 (crushing strength), 기공분포 (pore distribution), CEC를 측정하였다. 토양개량제로 사용할 과립은 취급시에 요구되는 기본적인 강도뿐만 아니라 토양과 혼합된 후 답압(踏壓)에 견디기 위한 강도 또한 요구된다. 본 연구에서는 과립의 답압에 관한 저항성 평가방법을 마련하고, 마른 상태와 젖은 상태에서 과립의 저항성을 측정하였다. 과립기의 회전속도와 가열온도에 비례하여 답압에 대한 저항성은 증가하나 CEC는 감소하였다. Pan granulator는 700℃이하의 가열에서 적절한 강도를 갖는 과립을 제조할 수 없었으나, high shear mixer granulator는 500℃이상의 가열에 의해 답압에 저항성을 갖는 과립을 제조할 수 있었다. This research tried to find out the optimum fabrication method of calcined clay granules comprising zeolite. Kaolin clay and natural zeolite powder were used as raw materials of calcined clay, and silica stone powder was used for controlling the porosity of the granules. The granulation was performed with two kinds of granulators: a pan granulator and a high-shear mixer granulator. Various granules were fabricated by the mixing ratios and the rotation speeds of the granulators, and were heated from 400 to 700℃ at 100℃ interval. The crushing strength, pore size distribution, and CEC of the granules were measured. The evaluation method for the resistance of granules to human treading was created and the tests were conducted at dry and wet conditions. The resistance and crushing strength improved in proportion to the rotation speed of the granulator and the heating temperature, but the CEC decreased. The pellet made by the pan granulator did not have the strength against treading upon heating to below 700℃, but the pellet made by the high-shear mixer granulator endured the treading test upon heating to over 500℃
Jeon, Young Joo,Kim, Ok Joon,Kim, Su Yeoun,Oh, Seung Hun,Oh, Doyeun,Kim, Ok Jun,Shin, Byoung Soo,Kim, Nam Keun Ovid Technologies Wolters Kluwer -American Heart A 2013 Arteriosclerosis, thrombosis, and vascular biology Vol.33 No.2
<P>MicroRNAs play a role in atherosclerosis-related diseases, such as cerebrovascular or cardiovascular disease. However, the effect of miR-146a, miR-149, miR-196a2, and miR-499 polymorphisms on stroke and silent brain infarction (SBI) susceptibility has not been reported.</P>