• 한국식품영양과학회지
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• 제31권5호
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• pp.945-951
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• 2002

시판 식혜의 품질에 대한 식품영양전공자들의 시판식혜의 이용실태, 기호도 및 개선점 등에 관한 의견을 조사한 결과 자주 마시는 음료로는 커피 (23.2%)와 과일주스(20.6%)가 전통음료(2.9%)에 비해 매우 높았다. 전통음료를 마시는 경우로는 기호만족(39.0%)이 가장 높았고, 그 다음으로 갈증해소(20.0%)가 높았다 시판 전통음료 선택시 가장 많이 고려하는 사항으로 맛(78.8%)이 가장 높았으며, 그 다음이 제조회사나 상표명 (12.6%)이었고, 원료함량표시나 영양성분(3.1 및 3.7%)은 낮았다. 가장 좋아하는 음료로는 식혜 54.7%로 가장 많았고, 그 다음이 유자차 또는 모과차로 20.9%이었으며, 수정과는 15.7%, 오미자차는 4.2%이었고 생강차는 1.8%로 가장 적었다. 가장 많이 마시는 시판 전통음료로는 식혜가 79.8%로 가장 닦았고, 그 다음이 대추차(4.3%)와 유자차, 모과차(4.8%)이었고 수정과(1.9%)는 낮았다 시판식혜를 구입하는 경우로는 평상시가 가장 높았고, 선물용과 특별한 날이 2순위와 3순위로 나타났다. 그러나 대부분의 조사대상자들은 시판 식혜가 전통적으로 가정에서 제조하는 식혜와 동일하지 않다고 하였다. 시판식혜를 구입하지 않는 이유로는 기호에 맞지 않을 것 같다가 가장 많았고 그 다음으로 전통의 맛이 아닐 것 같아서이었다. 시판식혜의 개선점으로는 맛>밥알의 양과 뜨는 정도>향의 순이었다. 한편 관능적 특성치 중에서 전반적인 기호도는 식혜는 가정에서 만든 식혜는 5.7점, 시판식혜는 3.5점이었으며 전반적인 기호도와 관능적 특성 치 들과는 양의 상관관계를 나타내었다. 전반적인 기호도와 유의적으로 양의 상관관계를 나타낸 관능적 특성은 맛, 밥알의 질감, 엿기름 함량, 밥알의 양, 밥알의 색, 향, 부재료의 함유정도, 밥알의 뜨는 정도이었으며, 이 중에서 상관계수가 높은 특성은 맛(0.554)>밥알의 질감(0.476)>엿기름 함량(0.398)의 순이었다. 이상의 결과를 바탕으로 기업체에서는 시판식혜를 전통의 맛에 더욱 가깝게 제조하려는 노력이 있어야 할 것으로 생각된다. 특히, 식혜 제조시 엿기름과 밥의 함량을 높여 설탕에 의한 단맛보다는 밥의 당화에 의한 맛과 향기 그리고, 밥알에 관한 점들을 개선하여야 할 것으로 사료된다.

• 한국환경농학회:학술대회논문집
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• 한국환경농학회 2009년도 정기총회 및 국제심포지엄
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• pp.273-282
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• 2009

The transmissible spongiform encephalopathies (TSEs) disease group are fatal neurodegenerative disorders affecting a wide range of hosts. The group includes kuru and Creutzfeldt-Jakob disease (CJD) in humans, scrapie in sheep and goats and Bovine spongiform encephalopathy (BSE) in cattle. The exact nature of the infectious agent involved in the transmission of these diseases remains controversial. However, a central event in their pathogenesis is the accumulation in infected tissues of an abnormal form of a host-encoded protein, the prion protein (PrP). Whereas the normal cellular protein is fully sensitive to protease ($PrP^{sen}$), the disease-associated prion protein ($PrP^d$) is only partly degraded ($PrP^{res}$), its amino-terminal end being removed. BSE was first reported in the mid-80s in the UK. Ten years later, a new form of human prion disease, variant CJD (vCJD) developed in the wake of the BSE epidemic, and there is now strong scientific evidence that vCJD was initiated by the exposure of humans to BSE-infected tissues, thus indicating a zoonotic disease. However, the ban on the feeding of animal-derived proteins to ruminants, and the apparent lack of vertical transmission of BSE, have led to a decline in the incidence of the disease within cattle herd and therefore, an assumed decreased risk for human contacting vCJD. The origin of the original case(s) of BSE still remains an enigma even though three hypotheses have been raised. Hypotheses are i) sheep- or goat-derived scrapie-infected tissues included in meat and bone meal fed to cattle, ii) a previously undetected sporadic or genetic bovine TSE contaminating cattle feed or iii) originating from a human TSE through animal feed contaminated with human remains. A host cellular membrane protein ($PrP^C$), which is abundant in central nervous system tissue, appear to be conformationally altered in the diseased host into a prion protein ($PrP^{Sc}$). This $PrP^{Sc}$ is detergent insoluble and partially protease-resistant ($PrP^{res}$). The term $PrP^{res}$ is normally used to describe the protein detected after protease treatment, in techniques such as Western immunoblotting, and enzyme-linked immunosorbant assay using fresh/frozen tissue. Immunohistochemistry may performed with formalin-fixed tissues. Also, clinical signs of the BSE are one of the major diagnostic indicators. Recently, atypical forms (known as H- and L-type) of BSE have appeared in several European countries, Japan, Canada and the United States. An unusual case was also reported in a miniature zebu. The atypical BSE fall into two groups based on the relative molecular mass (Mm) of the unglycosylated $PrP^{res}$ band relative to that of classical BSE, one of the higher Mm (H-type) and the other lower (L-type). Both types have been detected worldwide as rare cases in older animals, at a low prevalence consistent with the possibility of sporadic forms of prion diseases in cattle. This raises the unwelcome possibility that vCJD could increase in the human population. Now, active surveillance program against BSE is going on in Korea. In regional veterinary service lab, ELISA is applied to screen the BSE in slaughter and confirmatory tests by Western immunoblotting and immunohistochemisty are carried out if there are positive or suspect in the screening test. Also, the ruminant feed ban is rigorously enforced. Removal of specified risk materials such as brain and spinal cord from cattle is mandatory process at slaughter to prevent the infected material from entering the human food chain.

• Nuclear Engineering and Technology
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• 제55권6호
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• pp.2335-2347
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• 2023

As medical facilities are usually built at urban areas, special concrete aggregates and evaluation methods are needed to optimize the design of concrete walls by balancing density, thickness, material composition, cost, and other factors. Carbon treatment rooms require a high radiation shielding requirement, as the neutron yield from carbon therapy is much higher than the neutron yield of protons. In this case study, the maximum carbon energy is 430 MeV/u and the maximum current is 0.27 nA from a hybrid particle therapy system. Hospital or facility construction should consider this requirement to design a special heavy concrete. In this work, magnetite is adopted as the major aggregate. Density is determined mainly by the major aggregate content of magnetite, and a heavy concrete test block was constructed for structural tests. The compressive strength is 35.7 MPa. The density ranges from 3.65 g/cm³ to 4.14 g/cm³, and the iron mass content ranges from 53.78% to 60.38% from the 12 cored sample measurements. It was found that there is a linear relationship between density and iron content, and mixing impurities should be the major reason leading to the nonuniform element and density distribution. The effect of this nonuniformity on radiation shielding properties for a carbon treatment room is investigated by three groups of Monte Carlo simulations. Higher density dominates to reduce shielding thickness. However, a higher content of high-Z elements will weaken the shielding strength, especially at a lower dose rate threshold and vice versa. The weakened side effect of a high iron content on the shielding property is obvious at 2.5 µSv=h. Therefore, we should not blindly pursue high Z content in engineering. If the thickness is constrained to 2 m, then the density can be reduced to 3.3 g/cm³, which will save cost by reducing the magnetite composition with 50.44% iron content. If a higher density of 3.9 g/cm³ with 57.65% iron content is selected for construction, then the thickness of the wall can be reduced to 174.2 cm, which will save space for equipment installation.