• 한국축산식품학회지
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• 제36권1호
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• pp.29-36
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• 2016

This study was performed to investigate the role of pH and temperature postmortem, and to demonstrate the importance of these factors in determining meat quality. Postmortem pH_45min (pH at 45 min postmortem or initial pH) via analysis of Pearson’s correlation showed high positive correlation with pH change pH_c24 (pH change from pH_45min to pH_24h postmortem). However, postmortem pH after 24 h (pH_24h or ultimate pH) had a high negative correlation with pH change, pH_c24, CIE L*, and protein content. Initial temperature postmortem (T_1h ) was positively associated with a change in temperature from 45 min to 24 h postmortem (T_c24) and cooking loss, but negatively correlated with water holding capacity. Temperature at 24 h postmortem (T_24h) was negatively associated with T_c24. Collectively, these results indicate that higher initial pH was associated with higher pH_c24, T_1h, and T_c24. However, higher initial pH was associated with a reduction in carcass weight, backfat thickness, CIE a* and b*, water holding capacity, collagen and fat content, drip loss, and cooking loss as well as decreased shear force. In contrast, CIE a* and b*, drip loss, cooking loss, and shear force in higher ultimate pH was showed by a similar pattern to higher initial pH, whereas pH_c24, carcass weight, backfat thickness, water holding capacity, fat content, moisture content, protein content, T_1h, T_24h, and T_c24 were exhibited by completely differential patterns (p<0.05). Therefore, we suggest that initial pH, ultimate pH, and temperatures postmortem are important factors in determining the meat quality of pork.

• 한국축산식품학회지
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• 제18권4호
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• pp.292-300
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• 1998

This study was undertaken to determine the influence in the Z-disk domain of titin on the tenderization of meat by the structure change of myofibrillar Z-disks during post-mortem aging. After weakening the structure of Z-disks, the Z-disk region was splitted. As the results, myofibrils were fragmented by mechanical strength. Using indirect immunofluorescence microscopy, we show that the Z-disk domain of titin was disappeared from myofibrils in this period. There phenomenon were also shown by treating myofibrils with a solution containing 0.1mM $Ca^{2+}$. We conclude that change in Z-disk domain of titin is directly effected on the tenderization of meat during post-mortem aging and these change is due to manily calcium ions.

• 한국축산식품학회지
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• 제25권3호
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• pp.310-315
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• 2005

본 연구는 한우고기의 품질에 영향을 미치는 사후 대사변화를 구명하고자 사후 1, 3, 9, 24시간별에 따라 한우 거세우 배최장근의 pH, 도체온도, R-value 및 단백질분해효소 활성측정을 수행하였다. 도체 pH와 온도는 사후 시간이 경과함에 따라 유의적으로 감소하였고(p<0.05), 사후 3시간에 6.50($31.99^{\circ}C$)을 나타내었다. $R_{248}$과 $R_{250}$ 값은 사후 9시간부터 유의적으로 증가하였지만, $R_{258}$ 값은 사후 9시간부터 감소하였다(p<0.05). Calpain I 활성은 사후 3시간부터 유의적으로 감소하였고, calpastatin 활성은 사후 9시간부터 유의적으로 감소하였다(p<0.05). pH와 도체온도는 $R_{258}$, calpain I, calpastatin에서 0.95이상의 높은 정의 상관관계를 나타내었지만, $R_{248}$과 $R_{250}$에서는 -0.97 이상의 부의 상관관계를 보였다. 이상의 결과를 종합하면, 사후9시간 이후에 대사 변화가 급격히 발생하는 것으로 나타났고, pH와 도체온도의 상관도가 높아 잠재적인 연화능력의 예측이 가능할 것으로 사료되지만, 사후 3시간부터 9시간 사이의 대사변화에 대하여 좀 더 심도 깊은 연구할 필요가 있을 것으로 생각된다.

• 한국축산식품학회지
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• 제23권2호
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• pp.109-114
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• 2003

연도그룹에 따른 도체특성의 차이는 tender 그룹이 tough 그룹에 비해 무거운 도체중과 두꺼운 등지방 두께, 우수한 근내지방도, 밝은 육색, 흰 지방 및 좋은 조직감을 나타내었다(<0.05). 근절길이의 변화는 사후 시간이 경과함에 따라 지속적으로 감소하는 경향을 보였으며, 특히 사후 3시간 이후에 유의적으로 감소하였다(p<0.05). 연도에 따른 그룹간의 비교에서는 사후 3, 6 및 24시간에서 tender 그룹이 tough 그룹에 비해 유의적으로(p<0.05) 긴 근절길이를 나타내었다. 그리고 tender 그룹은 tough 그룹에 비해 낮은 IMCT 전단가를 나타내었고(p<0.05), 관능적으로 우수한 연도와 기호성을 나타내었다(p<0.05). 이상의 결과에서, 육의 연도는 다른 도체특성에 비해 등지방두께, 근내지방도 및 조직감과 밀접한 관련성을 보였으며, 사후초기인 3과 6시간에서의 근절길이를 측정함으로써 사후 24시간째 연도의 추정이 가능할 것으로 사료된다. 그리고 동일한 나이에서 연도와의 관련성은 총 콜라겐 및 가용성 콜라겐 함량보다는 근육내 결체조직의 강도와 더 높은 관련성 (p<0.05)이 있는 것으로 나타났다.

• 한국동물위생학회지
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• 제31권4호
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• pp.475-484
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• 2008

A year round study was carried out to investigate the etiology, clinical signs, postmortem lesions and occurrence of naturally occurring enterotoxaemia in Black Bengal goats. Sixteen goats of different age and sex died in different seasons with sigh associated with enterotoxaemia made the materials of this study. Accidental access to large amount of concentrate was noted as one of the predisposing factors although few cases were reported to occur without known diet change. Younger animals(50%) and males(62.50%) were found more prone to the disease and it was likely to be more prevalent during winter(50%) followed by at rainy season(31.25%) and summer(18.75%). Diarrhoea(81.25%), dullness(56.25%), drooping of the ears(50%), anorexia(43.75%) were recorded as major clinical signs whereas enterocolitis(100%), lung edema(87.50%), fluid filled intestines(87.50%), enlarged mesenteric lymph nodes(56.52%) etc. were most common post mortem lesions found. A few cases showed lesions on heart(31.25%), brain(25%) and/or liver/spleen(18.75%) but no lesion was found on kidney. Thus the so called 'pulpy kidney' lesion was absent. Intestinal contents were subjected to conventional bacteriological culture based methods to identify the causal agents. Based on the morphological, cultural and biochemical properties the causal agent was identified as Clostridium perfringens. Despite the study was carried out at certain area it showed a clear picture of goat enterotoxaemia in terms of etiology, clinical signs, postmortem lesions and occurrence of goat enterotoxaemia in Bangladesh.

• 한국수의병리학회:학술대회논문집
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• 한국수의병리학회 2003년도 추계학술대회초록집
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• pp.7-7
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• 2003

Histological examination of biopsy or postmortem lung tissue from patients with asthma usually reveals thickened airway walls. This change is called airway remodeling, which is characterized by airway eosinophilia, hyperplasia of goblet cells and smooth muscle, and subepithelial fibrosis [1,2]. In this study, we investigated the time-course functional, morphological, biochemical changes of remodeling in a ovalbumin (OVA)-induced murine chronic asthma model. (omitted)

• Asian-Australasian Journal of Animal Sciences
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• 제26권6호
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• pp.879-885
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• 2013

Fifty-four, mixed-sex, halothane-carrier crossbred (Yorkshire${\times}$Landrace) pigs with an average initial BW of $108.2{\pm}0.8$ kg were randomly allotted to one of three dietary treatments for 5 d before slaughter: i) a control corn-soybean meal finisher diet devoid of supplemental magnesium; ii) a diet supplemented with 1.5 g/kg of elemental Mg from magnesium acetate; and iii) a diet supplemented with 1.5 g/kg of elemental Mg from magnesium sulfate heptahydrate. Serum creatine kinase (CK), lactate and glucose were analyzed at slaughter. Muscles from longissimus (LM) were packaged and stored to simulate display storage for muscle lactate and glycogen determinations at 0, 1, 2, 3, and 4 d. Mg supplementation reduced (p<0.05) serum CK and lactate concentration, but had no effect (p>0.05) on serum glucose. Daily change of muscle lactate concentration linearly increased (p<0.01), while glucose concentration linearly decreased (p<0.05) as storage time increased in all treatments. However, dietary Mg acetate and Mg sulfate supplementation in pigs elevated (p<0.05) muscle glycogen and reduced (p<0.05) muscle lactate concentrations, especially during the first 2 d of display, compared with pigs fed the control diet. This study suggests that short-term feeding of magnesium acetate and magnesium sulfate to heterozygous carriers of the halothane gene has beneficial effects on stress response and pork quality by improving blood and muscle biochemical indexes.

• Fisheries and Aquatic Sciences
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• 제20권7호
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• pp.13.1-13.7
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• 2017

In order to evaluate the maximal storable period of the raw crab for a non-thermal muscle separation, the quality changes of the leg meat of red snow crab (Chionoecetes japonicus) during freeze storage were investigated. Fresh red snow crabs were stored at $-20^{\circ}C$ for 7 weeks, and the leg muscle was separated by a no heating separation (NHS) method every week. During the storage, considerable loss of the leg muscle did not occur and microbiological risk was very low. In contrast, discoloration appeared at 2-week storage on around carapace and the leg muscle turned yellow at storage 3-week. In physiochemical parameters, protein and free amino acids gradually decreased with storage time, expected that proteolytic enzymes still activated at $-20^{\circ}C$. At 4-week storage, the sensory acceptance dropped down below point 4 as low as inedible and notable inflection points in pH and acidity were observed. The volatile base nitrogen was low, though a little increase was recorded. These results suggested that the maximal storable period at $-20^{\circ}C$ of the raw material was within 2 weeks and it was depended on external factor such as the discoloration. The present study might be referred as basic data for approaches to solve quality loss occurred in non-thermal muscle separation.

• Animal cells and systems
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• 제6권1호
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• pp.81-84
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• 2002

SINE-R retroposons have been derived from human endogenous retrovirus HERV-K family and found to be hominoid specific. Both SINE-R retroposons and HERV_K family are potentially capable of affecting the expression of closely located genes. Using the genomic DNA from patients with schizophrenia, we identified 26 SINE-R retroposons and analyzed them with the sequences derived from the hominoid primates. The SINE-R retroposons from schizophrenia showed 89.7-96.6％ sequence similarities with the sequence of the schizo-cDNA clone that derived from postmortem tissue from the frontal cortex of an individual suffering from schizophrenial. Phylogenetic analysis using the neighbor-joining method revealed that the new SINE-R retroposons in schizophrenia have proliferated independently during hominid evolution. Such retroposons have great relevance to genomic change connected to human diseases. The data suggest that new SINE-R retroposons identified in schizophrenia deserve further investigation as potential leads on the understanding of neuropsychiatric diseases.

• 대한임상검사과학회지
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• 제49권2호
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• pp.108-113
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• 2017

급성심장사는 돌연 예기치 못한 심장질환에 의해 갑자기 사망하는 것으로, 법의부검 실시 전 초기 변사현장에서 외피 검시 과정 중 육안적으로 법의학적 사인 추정을 위한 명확한 소견 관찰이 어려운 점으로 인해 법의부검에서 심근 조직의 현미경적 변화 관찰을 통한 진단이 제안되고 있다. 그러나 검사시간, 비용, 편의성 등 변사사건 현장 외표 검시를 통한 사인추정 실무현장에 적용하는데 문제점을 드러내고 있다. 이에 본 연구에서는 임상 병원 진단검사의학에서 급성심근경색 환자의 진단 검사에 이용하는 심장표지물질 간이 검사 키트를 이용하여 사후 혈액에서 심장표지물질 myoglobin, CK-MB, cTn I를 측정하는 간이 검사가 내인성급사인 급성심장사를 사후 진단하는데 유용하게 이용될 수 있는지를 알아보고자 하였다. 외피 검시 및 간이검사 결과 비외상성 급성심장사로 추정되는 실험군 30예를 법의 부검 결과와 비교한 결과 23예(76.7%)에서 양성, 대조군 10예 중 뇌혈관질환 추정 4예 모두 음성, 알코올 및 약물 중독 1예, 산소결핍 질식사 1예에서 양성을 보였다. 심장표지물질 간이 검사의 민감도와 특이도는 각각 76.7%, 80.0%의 유의한 결과를 보여 변사사건 현장에서 변시체의 과거병력, 현장상황 및 사후시간 등을 종합적으로 고려하여 사후 급성심장사의 의심, 추정 진단에 보조적 방법의 하나로 유용하게 이용될 수 있을 것으로 사료된다. 향후 심장표지물질(myoglobin, CK-MB, cTn I)의 개별물질 특성에 의한 혈액 내 최초 발현 및 소멸시간, 시간 경과에 따른 농도 차이 등에 대한 선행연구 결과를 기초로 사망원인 규명 등 사건 해결에 필요한 사후경과시간 추정을 위한 사후 시간대 별 심장표지물질 농도에 대한 추가적인 연구가 계속 되어야 할 것이다.