• 제목/요약/키워드: Damage status

검색결과 757건 처리시간 0.031초

Effect of the magnetized water supplementation on blood glucose, lymphocyte DNA damage, antioxidant status, and lipid profiles in STZ-induced rats

  • Lee, Hye-Jin;Kang, Myung-Hee
    • Nutrition Research and Practice
    • /
    • 제7권1호
    • /
    • pp.34-42
    • /
    • 2013
  • This study investigated the effects of magnetized water supplementation on blood glucose, DNA damage, antioxidant status, and lipid profiles in streptozotocin (STZ)-induced diabetic rats. There were three groups of 4-week-old male Sprague-Dawley rats used in the study: control group (normal control group without diabetes); diabetes group (STZ-induced diabetes control); and magnetized water group (magnetized water supplemented after the induction of diabetes using STZ). Before initiating the study, diabetes was confirmed by measuring fasting blood glucose (FBS > 200 dl), and the magnetized water group received magnetized water for 8 weeks instead of general water. After 8 weeks, rats were sacrificed to measure the fasting blood glucose, insulin concentration, glycated hemoglobin level, degree of DNA damage, antioxidant status, and lipid profiles. From the fourth week of magnetized water supplementation, blood glucose was decreased in the magnetized water group compared to the diabetes group, and such effect continued to the 8th week. The glycated hemoglobin content in the blood was increased in the diabetes group compared to the control group, but decreased significantly in the magnetized water group. However, decreased plasma insulin level due to induced diabetes was not increased by magnetized water supplementation. Increased blood and liver DNA damages in diabetes rats did significantly decrease after the administration of magnetized water. In addition, antioxidant enzyme activities and plasma lipid profiles were not different among the three groups. In conclusion, the supplementation of magnetized water not only decreased the blood glucose and glycated hemoglobin levels but also reduced blood and liver DNA damages in STZ-induced diabetic rats. From the above results, it is suggested that the long-term intake of the magnetized water over 8 weeks may be beneficial in both prevention and treatment of complications in diabetic patients.

Oxytocin Ameliorates Remote Liver Injury Induced by Renal Ischemia-Reperfusion in Rats

  • Hekimoglu, Askin Tas;Toprak, Gulten;Akkoc, Hasan;Evliyaoglu, Osman;Ozekinci, Selver;Kelle, Ilker
    • The Korean Journal of Physiology and Pharmacology
    • /
    • 제17권2호
    • /
    • pp.169-173
    • /
    • 2013
  • Renal ischemia-reperfusion (IR) causes remote liver damage. Oxytocin has anti-inflammatory and antioxidant effects. The main purpose of this study was to evaluate the protective function of oxytocin (OT) in remote liver damage triggered by renal IR in rats. Twenty four rats were randomly divided into four different groups, each containing 8 rats. The groups were as follows: (1) Sham operated group; (2) Sham operated+OT group (3) Renal IR group; (4) Renal IR+OT group. OT ($500{\mu}g/kg$) was administered subcutaneously 12 and 24 hours before and immediately after ischemia. At the end of experimental procedure, the rats were sacrificed, and liver specimens were taken for histological assessment or determination of malondialdehyde (MDA), total oxidant status (TOS), total antioxidant status (TAS), paraoxonase (PON-1) activity and nitric oxide (NO). The results showed that renal IR injury constituted a notable elevation in MDA, TOS, Oxidative stress index (OSI) and significantly decreased TAS, PON-1 actvity and NO in liver tissue (p<0.05). Additionally renal IR provoked significant augmentation in hepatic microscopic damage scores. However, alterations in these biochemical and histopathological indices due to IR injury were attenuated by OT treatment (p<0.05). These findings show that OT ameliorates remote liver damage triggered by renal ischemia-reperfusion and this preservation involves suppression of inflammation and regulation of oxidant-antioxidant status.

선박 엔진의 실린더 라이너의 손상 진단을 위한 신경회로망의 적용 (Application of Neural Network for Damage Diagnosis of Marine Engine Cylinder Liner)

  • 조연상;구현호;박준홍;박흥식
    • Tribology and Lubricants
    • /
    • 제30권6호
    • /
    • pp.356-363
    • /
    • 2014
  • Marine diesel engines operate in environments in which damage easily occurs from corrosion. Recently, damage to cylinder liners has increased from corrosion wear caused by increased engine power. This damage can cause serious problems in the economy. Thus, many researchers have treated and studied damaged cylinder liners. However, a method is necessary for real-time monitoring of damage to cylinder liners during operation of the engine, before serious damage can occur. This study carries out reciprocating friction and wear tests on a cast iron specimen under various corrosion atmospheres and verifies the variations of friction coefficient and friction surface. Additionally, the friction coefficient and friction status are predicted by using a neural network that learns the vibration and frequency spectrum data from an acceleration sensor. According to our conclusions, amplitude is distributed highly at high frequencies, and values of standard deviation and kurtosis are high when damage to the friction surface is serious. The accuracy rate of the friction coefficient predicted by the neural network is over 80% of the real measured value without NaCl, and application of the neural network is very effective for diagnosing the friction condition and damage to the cylinder liner.

식이 요인이 SCE 빈도수로 본 흡연노인 임파구 DNA손상에 미치는 영향 (Effects of Dietary Factors on Lymphocyte DNA Damage in Smoking Elderly People in Korea)

  • 강명희;이정희
    • 한국식품영양과학회지
    • /
    • 제33권3호
    • /
    • pp.523-532
    • /
    • 2004
  • 영양소의 섭취를 포함한 여러 식이성요인에 따라 일부 지역 남자 노인의 인체 임파구 SCE 빈도수가 어떤 영향을 받는지를 조사해 보고자하여 60세 이상의 노인 45명을 대상으로 설문조사를 실시한 후 채혈하여 임파구 SCE 시험을 실시하였다. 조사 대상자의 식이성 요인이 SCE 빈도수에 미치는 영향에 대해 분석한 결과는 다음과 같다. 1. 채혈 대상자를 흡연여부에 따라 흡연군(n=14), 담배를 피우다가 현재는 끊은 금연군(n=16), 비흡연군(n=15)으로 나눈 후 SCE 빈도수를 비교한 결과 흡연군의 SCE빈도수가 비흡연군에 비해 유의적으로 높았으며 노인의 나이가 많을수록 DNA 손상정도가 증가하였다. 대상 노인의 인구학적 요인 중 신장, 혹은 체중이 전 대상자군에서 SCE 빈도수와 각각 역의 상관관계를 보였으며 흡연군에서는 신장과 SCE빈도수가 역의 상관관계, 그리고 pack years로 본 흡연력과 SCE 빈도수가 정의 상관관계 를 보였다. 2. 전 대상자군에서는 24시간 회상법으로부터 구한 영양소의 섭취와 SCE빈도수 간에 상관관계가 없었으나 흡연군의 경우는 식이섬유질 섭취량, 금연군의 경우는 비타민 C 섭취량과 SCE 빈도수가 각각 정의 상관관계를 보였다. 그러나 비 흡연군에서는 지방, 인 혹은 비타민 A 섭취량과 SCE빈도수 간에 역의 상관관계를 보였다. 3. 흡연군에서 육어류 섭취빈도와 SCE빈도수 간에 정의 상관관계를 보였고, 비 흡연군에서 식 사균형도가 SCE 빈도수와 역의 상관관계를 보였다. 세 군을 모두 합한 전대상자군의 경우, 혈당수준과 SCE 빈도수 사이에 정의 상관관계가 나타났다. 금연군에서 감미료를 섭취하는 군의 SCE 빈도수가 섭취하지 않는 군보다 유의적으로 높았다. 나머지 식이성 요인들은 SCE 빈도수와 상관성을 보이지 않았다. 본 연구 결과는 앞으로 DNA손상도가 높은 노인 대상으로 이의 회복을 위하여 식이성 요인을 이용한 영양중재실험을 계획할 때, 혹은 노인 대상의 영양교육 시에 중요한 기초자료로 활용될 수 있을 것이다.

비타민 E 보충섭취가 폐경기 여성의 혈장 항산화 영양상태 및 DNA 손상 개선에 미치는 영향 (The Effect of Alpha-tocopherol Supplementation on the Improvement of Antioxidant Status and Lymphocyte DNA Damage in Postmenopausal Women)

  • 김창숙;강해진;이순희;박유경;강명희
    • Journal of Nutrition and Health
    • /
    • 제40권8호
    • /
    • pp.708-718
    • /
    • 2007
  • 본 연구는 비타민 E의 보충섭취가 폐경기 여성의 항산화 영양상태 및 임파구 DNA 손상을 개선할 수 있는지를 알아보고자 수행되었으며, 이중맹검법으로 실시되었고 플라시보를 위약군으로 하였다. 폐경기 여성 35명을 대상으로 6주 동안 비타민 E 보충섭취군에게는 비타민 E 캡슐($\alpha$-tocopherol 성분 400 IU/capsule)을, 위약군에게는 대두유로 만든 위약 캡슐(400 mg/capsule)을 하루 2회 섭취하도록 하였으며, 이 때 두 군의 분류는 무작위로 하였다. 항산화 영양상태를 알아보기 위해 혈장 vitamin C, $\alpha$-tocopherol, $\gamma$-tocopherol, $\alpha$-carotenoid, $\beta$-carotenoid, lycopene 농도를 측정하였고, 임파구 DNA 손상정도를 알아보기 위해서는 Comet assay를 이용하여 tail length, %DNA in tail, tail moment를 측정하였다. 비타민 E 보충섭취군에서는 혈장 vitamin C(p<0.05)와 $\alpha$-tocopherol(p<0.000)농도가 유의적으로 증가하였고, $\gamma$-tocopherol(p<0.000) 농도와 tail length(p<0.05)는 유의적으로 감소하였다. 반면, 위약군에서는 혈장 vitamin C(p<0.05)의 농도만이 유의적으로 증가하였다. 결론적으로, 본 연구는 비타민 E의 보충섭취가 혈장 항산화 상태 및 DNA 손상에 대해 부분적인 개선 효과가 있음을 보여주었다.

GENE-SPECIFIC OXIDATIVE DNA DAMAGE IN HELICOBACTER PYLORI INFECTED HUMAN GASTRIC MUCOSA

  • Jinhee Chol;Yoon, Sun-Hee;Kim, Ja-Eun;Rhee, Kwang-Ho;Youn, Hee-Sang;Chung, Myung-Hee
    • 한국독성학회:학술대회논문집
    • /
    • 한국독성학회 2002년도 Current Trends in Toxicological Sciences
    • /
    • pp.84-84
    • /
    • 2002
  • Abstract To study the status of oxidative DNA damage in Helicobacter pylori infection in more details, gene-specific oxidative DNA damage was investigated by examining oxidative DNA damage to individual genes. This was done by determining the loss of PCR product of a targeted gene before and after gastric mucosal DNA was treated with 8-hydroxyguanine glycosylase, which cleaves DNA at the 8-hydroxyguanine residues.(omitted)

  • PDF

정적 변형률 데이터를 사용한 CNN 딥러닝 기반 PSC 교량 손상위치 추정 (CNN deep learning based estimation of damage locations of a PSC bridge using static strain data)

  • 한만석;신수봉;안효준
    • 한국BIM학회 논문집
    • /
    • 제10권2호
    • /
    • pp.21-28
    • /
    • 2020
  • As the number of aging bridges increases, more studies are being conducted on developing effective and reliable methods for the assessment and maintenance of bridges. With the advancement in new sensing systems and data learning techniques through AI technology, there is growing interests in how to evaluate bridges using these advanced techniques. This paper presents a CNN(Convolution Neural Network) deep learning based technique for evaluating the damage existence and for estimating the damage location in PSC bridges using static strain data. Simulation studies were conducted to investigate the proposed method with error analysis. Damage was simulated as the reduction in the stiffness of a finite element. A data learning model was constructed by applying the CNN technique as a type of deep learning. The damage status and its location were estimated using data set built through simulation. It was assumed that the strain gauges were installed in a regular interval under the PSC bridge girders. In order to increase the accuracy in evaluating damage, the squared error between the intact and measured strains are computed and applied for training the data model. Considering the damage occurring near the supports, the results of error analysis were compared according to whether strain data near the supports were included.

사과 주산지 사과원에서 2종 심식나방류의 발생동향 (Recent Occurrence Status of Two Major Fruit Moths, Oriental Fruit Moth and Peach Fruit Moth in Apple Orchards)

  • 최경희;이순원;이동혁;김동아;김순경
    • 한국응용곤충학회지
    • /
    • 제47권1호
    • /
    • pp.17-22
    • /
    • 2008
  • 본 조사는 1992년부터 2005년까지 14년간 경남북 및 전북의 $4{\sim}8$개 시군의 사과주산지에서 $16{\sim}30$개 사과원을 대상으로 실시되었으며, 과실을 직접 가해하는 2종 해충인 복숭아심식나방(Carposina sasakii)과 복숭아순나빈 Grapholita molesta)의 발생 및 피해정도를 비교, 분석하였다. 수확기 복숭아순나방에 의한 평균 피해과율은 $0.02{\sim}1.64%$였으며, 1997년을 기점으로 그 이전 연도보다 그 후 연도의 피해가 많은 경향이었다. 반면 복숭아심식나방의 평균 피해과율은 $0.02{\sim}1.30%$였으며, 1998년을 제외하고 피해과율이 0.3% 이하로 극히 낮았다. 복숭아순나방과 복숭아심식나방의 발생과원율은 각각 $13{\sim}71%,\;12{\sim}57%$였으며, 1997년 이후로 복숭아순나방의 발생과원율이 복숭아심식나방 발생과원율에 비하여 지속적으로 높게 나타났다. 각 연도별로 최대 피해를 받은 사과원의 피해과율을 비교해 본 결과 역시 발생과원율의 발생경향과 동일하였으며, 최고 피해 사과원의 복숭아순나방 피해과율은 2005년 20%로 조사연도 중에서 가장 높았다. 복숭아순나방 1세대에 의한 사과나무 신초의 피해율은 $0.1{\sim}8.1%$였으며, 수확기 피해과율 간에는 정의 상관관계를 보였다. 이상의 결과를 종합해 볼 때 최근 관행적으로 관리가 이루어지는 사과원에서 복숭아순나방이 복숭아심식나방에 비하여 우점하는 것으로 판단된다.