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Ji-Young Yoon,Young-Eun Lee 한국식품영양과학회 1999 Preventive Nutrition and Food Science Vol.4 No.4
The Physical properties of corn starch were investigated by scanning electron microscopy, X-ray diffractometry and differential scanning calorimetry during the formation of enzyme-resistant starch (RS). Samples were studied in their native states and after annealing at 50, 55, 60 and 65℃ in excess water (starch : water=1 : 3) for 48 hr. Starch granules became smaller and more rounded after annealing than in their native state. Annealing did not change the X-ray profile of native corn starch. After autoclaving-cooling cycles, native starch lost most of its crystallinity but annealed ones showed some of their crystallinity left as diffuse or poor B-type, which didn’t relate to increasing RS yields. During formation of RS, however, both native and annealed starches changed their X-ray profile from A-type to poor B-type of retrograded amylose. Annealing caused an increase in gelatinization temperature and enthalpy, but a narrowing of gelatinization temperature range. Only starch annealed at 65℃, however, showed a decrease in enthalpy even though its gelatinization temperature increased, which appeared to be due to the partial gelatinization in the amorphous region during annealing. Peak height index (PHI), the ratio of Δ H to Tp-To, increased by annealing. PHI values, therefore, showed the possibility as an indicator to predict RS yield which cannot be differentiated by differential scanning calorimetry and X-ray diffraction data.
Influence of Amylose Content on Formation and Characteristics of Enzyme - resistant Starch
Ji-Young Yoon,Young-Eun Lee 한국식품영양과학회 1998 Preventive Nutrition and Food Science Vol.3 No.4
Influence of amylose content on formation and characteristics of enzyme-resistant starch (RS) was investigated by scanning electron microscopy, X-ray diffractometry and differential scanning calorimetry. RS yield increased up to 36.1% as the amylose content of com starch increased. Starch granules of Amylomaize Ⅴ and Ⅶ were more rounded and smaller than those of regular corn: some were elongated and had appendages. After autoclaving-cooling cycles, the granular structure disappeared and a continuous spongy-like porous network was visible in regular com starch; the granular structure was still evident in parts in Amylomaize Ⅴ and Ⅶ starches. In all isolated RS residues, the porous structures were no longer visible and more compact formations predominated. While regular com starch showed an A-type X-ray profile, Amylomaize Ⅴ and Ⅶ starches exhibited a combination of B- and V-types. Regular corn starch lost most of its crystallinity during autoclaving, but the crystallinity was still left in Amylomaize starches as diffuse or poor B-types. All RS residues showed the presence of poor B-type regardless of amylose contents. Transition temperatures and enthalpy of native starches were a little higher in Amylomaize Ⅴ and Ⅶ starches than those of regular com starch. Regardless of amylose contents, all RS residues exhibited an endothermic transition over a similar temperature range (135~169℃), with a mean peak temperature of ~154℃, which is generally found for retrograded amylose crystallites. Higher transition temperature, enthalpy, and RS yield of Amylomaize Ⅴ and Ⅶ starches were related to granular stability shown by the microscopic and crystallographic studies.
A study on preferred colors of four seasons depending on regions
Ji Young Yoon,Gyoung Sil Choi 한국색채학회 2011 한국색채학회 학술대회 Vol.2011 No.10
Psychology of color vision may vary depending on climatic conditions of an observer. Accordingly, the present study aims to comparatively analyze preferred colors by seasons focused on four regions including Seoul, Mokpo, Taebaek, and Daegu which are characteristic of microclimate to investigate associations in relation to what physical standards and properties are to identify color perceptions. As a result, there were significant differences in the preferred colors between the regions in the rest of the seasons except winter. There was no difference in colors and differences were observed only in color tone. As a result of investigating and comparing the above four regions that are characteristic of clear singularities in climate, the reason was found in climatic elements including the amount of sunshine, humidity, and the amount of clouds etc.
Ji-Young Yoon,Keun-Ok Jung,Jeung-Ha Kil,Kun-Young Park 한국식품영양과학회 2005 Preventive Nutrition and Food Science Vol.10 No.1
Commonly used spices in Korean cooking (red pepper powder, garlic, ginger) were evaluated for antiobesity properties and effects on triglyceride (TG) and cholesterol in blood and adipose tissues in rats fed a high fat (20%) diet. SD rats were raised for four weeks on either a normal diet (ND, based on the AIN-93M diet), high fat diet (HFD, supplemented with 16% lard oil in the ND), or diets containing 5% red pepper powder (RPP), garlic or ginger. These spices significantly decreased weight gain compared to HFD, but garlic and ginger showed a greater effect on reducing weight gain than RPP. The weights of liver and epididymal and perirenal fat pads in garlic and ginger diet groups were lower than those of the HFD groups (p<0.05). The garlic and ginger also decreased triglyceride and cholesterol contents in liver and epididymal and perirenal fat pad, reversing the higher levels seen in HFD. RPP, garlic and ginger supplemented diets were effective in lowering serum triglyceride and cholesterol levels (p<0.05). These results indicated that garlic and ginger more effectively suppressed the effects of HFD on body fat gain and lipid values of adipose tissues and serum than RPP.
Development of Commercial Waxy-Super Sweet Corn Hybrids in Korea
Ji-Young Yoon,Sin-Gu Kang,Gi-Sup Ahn,Soon-Kwon Kim 한국작물학회 2008 한국작물학회 학술발표대회 논문집 Vol.2008 No.10
Super-sweet corn controlled by shrunken2 (sh2) was first introduced into Korea three decade ago, but its cultivation and uses have not been popularized. Main reasons of the un-popularity are considered as lack of locally bred adapted cultivars, low germination, too sweet and less chewing of the green ears. Considering traditional and favorable eating habits of glutinous waxy corn by Koreans, we initiated to develop a double mutant wx/sh corn that has 3:1 segregation in an ear from 1996. First we formed several double cross hybrids using commercial single crosses of wx and sh2 hybrid considering seed production difficulties. The results showed that a double mutant corn hybrid showed high germination, and high palatability score with tolerance to major diseases and insects in Korea. In 2008, we conducted single and double cross trials in Gokseong, South Jeolla-do. The yield of waxy-super sweet was higher than both waxy and super sweet corn with good agronomic traits of ear height, ear weight, ear length and plant height. Among waxy-super sweet corn single cross was even better than double cross in all parameters. This double mutant approach shall be an outstanding option to change of traditional food habits into a new eating pattern. This attempt has potential success of commercial wx/sh hybrid corn development.
Atypical Manifestation of Primary Hepatocellular Carcinoma and Hepatic Malignancy Mimicking Lesions
Jiyoung Yoon,So Hyun Park,Su Joa Ahn,Young Sup Shim 대한영상의학회 2022 대한영상의학회지 Vol.83 No.4
Hepatocellular carcinoma (HCC) can be diagnosed noninvasively on multiphasic CT and MRI based on its distinctive imaging findings. These features include arterial phase hyperenhancement and washout on portal or delayed phase images. However, radiologists face significant diagnostic challenges because some HCCs exhibit atypical imaging characteristics. In addition to many HCC-mimicking lesions, such as arterioportal shunts, combined HCC-cholangiocarcinoma, intrahepatic cholangiocarcinoma, and hemangioma present a challenge for radiologists in actual clinical practice. The ability to distinguish HCCs from mimickers on initial imaging examinations is crucial for appropriate management and treatment decisions. Therefore, this pictorial review presents the imaging findings of atypical HCCs and HCCs mimicking malignant and benign lesions and discusses important clues that may help narrow down the differential diagnosis.