• Journal of Microbiology and Biotechnology
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• 제16권2호
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• pp.219-225
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• 2006

The rabbit pyrogen test and Limulus amoebocyte lysate (LAL) assay have been used to detect endotoxins present in vaccines. Currently, the rabbit pyrogen test is used to detect endotoxins in hepatitis B (HB) vaccines, even though the HB surface protein, which is the active ingredient, is overexpressed in and purified from eukaryotic cells that lack these endotoxins. Although the LAL clot assay is sensitive and reliable and can be used to replace the rabbit pyrogen test, its reaction is limited by the lack of responsiveness to the Gram-positive bacterial components. Furthermore, aluminum hydroxide in the HB vaccine can interfere with the LAL assay. In contrast, macrophages can detect the endotoxin as well as other pyrogens, and secrete $TNF-{\alpha}$. Therefore, this study was undertaken to examine the possibility of replacing the animal tests with a more efficient $TNF-{\alpha}$ secretion assay. With this in mind, we determined if aluminum hydroxide in the HB vaccines affects the $TNF-{\alpha}$ secretion assay. HB vaccines and the HB protein solutions spiked with lipopolysaccharide (LPS) produced the same level of dose-dependent $TNF{\alpha}$ secretion and temperature increase in rabbits, indicating that aluminum hydroxide in the HB vaccine does not interfere with the pyrogenic response in rabbits, nor does it interfere with $TNF-{\alpha}$ secretion. In addition, the $TNF-{\alpha}$ assay was found to be more sensitive than the LAL assay, and correlated well with the pyrogen test and the LAL assay. These results suggest that the $TNF-{\alpha}$ assay in RAW264.7 cells is a good substitute for the current pyrogen assays that are used for detecting LPS in HB vaccines as well as in other vaccines containing aluminum.

• Journal of Preventive Medicine and Public Health
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• 제24권4호
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• pp.507-515
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• 1991

백서 주령이 일산화탄소(CO) 폭로후 carboxyhemoglobin (HbCO) 형성 및 해리에 미치는 영향을 관찰하기 위하여 주령 1주, 2주, 6주 및 10주의 Sprague-Dawley계 백서에 일산화탄소를 폭로시킨 후 HbCO를 측정하여 다음과 같은 결론을 얻었다. 1. CO에 급성으로 폭로된 후 형성되는 HbCO의 농도는 백서 주령에 따라 유의한 차이를 보였으며, 이는 1주군에서 현저히 높았고, 폭로후 120분이 경과되어도 다른 주령군에 비하여 유의하게 높았다. 2. CO에 폭로되지 않은 백서에서의 HbCO농도는 각 주령군마다 유의한 차이를 보였으며, 비폭로군에서 얻어진 주령별 평균 HbCO농도를 CO폭로후 얻어진 개개의 관측치에서 뺀 후 이를 비교한 결과 1.에서와 같은 차이를 보이지 않았다. 3. CO폭로후 경과시간과 HbCO 농도와의 관계를 알아보는 회귀분석에서 폭로후 경과시간은 HbCO농도에 유의한 영향을 미치며, HbCO가 해리되는 속도는 주령 1주군에서 유의하게 높았다.

• 미생물학회지
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• 제39권3호
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• pp.192-196
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• 2003

다양한 유산균 자원을 확보하기 위한 일환으로, 동치미에서 유산균을 분리하였다. 동치미에서 분리된 균주는, 당이용성과 16S rRNA 유전자분석을 통하여,Lactobacillus plantarum HB1으로 밝혀졌다. 이 균주는 Gram 양성균이었으며, catalase를 갖고 있지 않았다. 16S rRNA유전자의 염기배열 120 bp을 분석해 본 결과,1～88 bp 영역에서는 기존의 것과 거의 100%의 상동성을 보여 주었고,나머지 32 bp의 영역에서는 상당한 변이를 보여 주었다. 따라서 본 균주는 기존의 L. plantarum과는 다른 균주임을 확인할 수 있었다. 동치미의 무에 포함되어 있는 질산염은 체내에서 아질산염으로 바뀐다. 아질산염은 아민과 반응을 일으켜 니트로사민이 되는데, 이 성분은 위암 발생을 일으키는 주요인자중의 하나이다. 동치미에서 분리된 본 균주의 배양액에 400 ${\mu}M$의 아질산염을 첨가한 경우 1시간30분 후에 거의 소거되었다. 아질산염 소거작용에 관여하는 본 균주 배양액 중의 특정성분의 분리, 소거작용 기작 등에 관한 보다 깊이 있는 연구가 앞으로 필요하다.

• 한국수산과학회지
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• 제16권2호
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• pp.68-74
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• 1983

부산 수영만의 조간대 저질에서 moderate halophile인 Listeria denitrificans HB-38을 분리하여 생육에 필요한 NaCl 요구도를 조사한바, 해양환경조건의 배지에서는 $4\%$ NaCl에서 육상환경조건의 배지에서는 $10\%$ NaCl에서 최적농도였으며, 균생육 최적 온도는 $40^{circ}C$였고, 생육최적 pH는 7.5이었다. 그리고 비호염성인 E.coli, KPM 105와 protoplast안정성을 비교해본 결과, 더 높은 stabilizer의 농도를 요구하지는 않았으며, stabilizer로서 NaCl이sorbitol이나 sucrose보다 protoplast에 더 안정성을 주는 것으로 나타났다. HB-38균주의 succinic dehydrogenase 활성에는 NaCl 농도가 증가함에 따라 그 활성 이 증가하다가 $9\%$에서 최대에 달하였다. 반면에 이 호염성효소의 $(NH_4)_2\;SO_4$와 NaCl에 의한 염석은 비호염성인 E.coli 및 bovine liver 세포의 경우보다 더 높은 농도의 염에 의하는 것은 아니였다. 그리고 ethidium bromide에 의한 curing과 agarose gel 전기영동의 결과 HB-38은 extrachromosomal DNA를 가지지 않는 것으로 나타났다.

• 한국결정학회지
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• 제7권1호
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• pp.73-80
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• 1996

단일 온도대역 수평 Bridgman(1-T HB)법에 의해 2인치 직경의 GaAs 단결정을 성장시키기 위하여 그 장치를 설계·제작하였고, undoped, Si-doped 및 Zn-doped 단결정을 성장하였다. 단결정성의 측면에서 성장횟수별 비로 0.73의 단결정성을 보였고, 격자결함 밀도(etch pit density)는 n-type의 경우 평균 5,000/cm2, p-type의 경우 10,000/cm2, 그리고 undoped의 경우 20,000/cm2 정도를 보였다. 한편 undoped GaAs 단결정의 경우, Hall 측정에 의한 carrier 농도가 ∼1×1016/cm3인 것으로 나타나 기존의 이중 온도대역(2-T : double temperature zone) 또는 삼중 온도대역(3-T : three temperature zone) 수평 Bridgman 방식에 비하여 Si 유입량이 절반 수준인 것으로 측정되었다. 따라서 1-T HB 방식에 의하여 2-T나 3-T HB 방법보다 나은 수율을 갖고 더 순도가 높은 GaAs 단결정을 성장시킬 수 있었다.

• Nutrition Research and Practice
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• 제2권4호
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• pp.283-288
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• 2008

This study was carried out to determine whether a short-tenn zinc supplementation contributes to beneficial changes in glycemic control among type 2 diabetic patients. Seventy-six diabetic subjects and 72 normal adults participated in this study. Subjects were divided into supplemented and control groups. Forty-four diabetic patients and 34 normal subjects were supplemented with 50 mg zinc daily as zinc gluconate for 4 weeks. Zinc status was assessed from fasting plasma levels and urinary excretion. The effects of zinc supplementation on fasting blood glucose, $HbA_{1c}$, insulin, and C-peptide were measured at the beginning of the study and after 4 weeks of supplementation. The changes in glycemic control indicators were compared between diabetic groups, classified by baseline $HbA_{1c}$ levels, and by diabetic duration. At baseline, the incidence of marginal zinc deficiency in the diabetic group, as determined by plasma zinc level, was approximately twice as high as in the normal adult group. The changes of $HbA_{1c}$ concentration, and fasting blood glucose following supplementation were not statistically significant in diabetic subjects. In normal subjects, a significant decrease of $HbA_{1c}$ occurred only in the zinc supplemented group. No significant changes were observed for serum insulin and C-peptide in diabetic as well as normal subjects. However, when the changes were compared by baseline $HbA_{1c}$ level, we found that diabetic subjects with $HbA_{1c}\;{\geq}\;7.5%$ showed significantly improved levels of $HbA_{1c}$ and fasting glucose after Zn supplementation. While such improvement in fasting blood glucose was significant among diabetics with shorter diabetic duration, significant levels of increase in serum insulin and C-peptide were observed in zinc supplemented subjects with longer diabetic duration. Fasting blood glucose was significantly decreased, whereas serum insulin and C-peptide were increased in diabetics with marginal zinc status. Therefore, we suggest that Zn supplementation for a short-term period may improve glycemic control in diabetic patients with higher $HbA_{1c}$ levels and marginal zinc status.

• Journal of Cardiovascular Imaging
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• 제31권2호
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• pp.71-82
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• 2023

BACKGROUND: Cardiac magnetic resonance fingerprinting (cMRF) enables simultaneous mapping of myocardial T1 and T2 with very short acquisition times. Breathing maneuvers have been utilized as a vasoactive stress test to dynamically characterize myocardial tissue in vivo. We tested the feasibility of sequential, rapid cMRF acquisitions during breathing maneuvers to quantify myocardial T1 and T2 changes. METHODS: We measured T1 and T2 values using conventional T1 and T2-mapping techniques (modified look locker inversion [MOLLI] and T2-prepared balanced-steady state free precession), and a 15 heartbeat (15-hb) and rapid 5-hb cMRF sequence in a phantom and in 9 healthy volunteers. The cMRF_5-hb sequence was also used to dynamically assess T1 and T2 changes over the course of a vasoactive combined breathing maneuver. RESULTS: In healthy volunteers, the mean myocardial T1 of the different mapping methodologies were: MOLLI 1,224 ± 81 ms, cMRF_15-hb 1,359 ± 97 ms, and cMRF_5-hb 1,357 ± 76 ms. The mean myocardial T2 measured with the conventional mapping technique was 41.7 ± 6.7 ms, while for cMRF_15-hb 29.6 ± 5.8 ms and cMRF_5-hb 30.5 ± 5.8 ms. T2 was reduced with vasoconstriction (post-hyperventilation compared to a baseline resting state) (30.15 ± 1.53 ms vs. 27.99 ± 2.07 ms, p = 0.02), while T1 did not change with hyperventilation. During the vasodilatory breath-hold, no significant change of myocardial T1 and T2 was observed. CONCLUSIONS: cMRF_5-hb enables simultaneous mapping of myocardial T1 and T2, and may be used to track dynamic changes of myocardial T1 and T2 during vasoactive combined breathing maneuvers.

• 한국동물학회지
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• 제19권2호
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• pp.95-98
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• 1976

집단 수용되고 있는 농아자들의 식생활이 이들의 체위 향상과 Hb형성에 미치는 영향 및 혈액형의 분포율에 일반 가정아와 차이가 있을 것으로 예상하고 이 양군을 비교 검토한 결과는 다음과 같다. Hb 양은 일반가정아에 비해 현저히 부족한 상태이어서 9.2gr/dl에 불과했고, 혈액형도 정상아의 분포와는 달리 A형 30.7%, B형 23.6%, AB형 15.0%, O형 30.7%로 나타났다.

• Journal of Korean Biological Nursing Science
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• 제12권2호
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• pp.106-113
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• 2010

Purpose: This study is conducted to examine the relationship among self management, HbA1c, and perceived health status of type II diabetes patients in community health department. Methods: Data were collected from 93 type II diabetes patients who are registered at five community health center using comprehensive survey, modified self care behavior, blood glucose and HbA1c were assessed by nurses. The data was analyzed by the SPSS (14.0) computer program, and it included descriptive statistics, t-test, ANOVA, and pearson's correlation coefficient. Results: There was significant relationship between perceived health status and HbA1c (r=-.252, p=.015). There was significant relationship between self management and HbA1c (r=-.279, p=.007). Conclusion: In order to control blood glucose in the type II diabetes patients, it is necessary to develop supportive self management programs by considering perceived health status.

• 조명전기설비학회논문지
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• 제18권4호
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• pp.15-21
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• 2004

광속구(integrating sphere photometer), 분광기(monochromator)등을 이용하여 노랑색(Y), 녹색(G), 백색(W)의 SMD(surface mounted device)형태의 HB LED(high brightness light emitting diode)에 대한 광속(luminous flux, LF), 상관 색온도(correlated color temperature, CCT), CIE 색도좌표(chromaticity coordinate CC)등 광특성을 실험하여 그 결과치를 비교 분석하였고, 백색 LED에 대해서는 연색지수를 고찰하였다.