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Certains problemes fondamentaux de la syntaxe $reconsid{\acute{e}}r{\acute{e}}s$ du point de vue de la syntaxe positionnelle (위치통사론을 통해 살펴 본 몇 가지 통사론의 본질적 문제)

  • Leem, Jai-Ho
    • Lingua Humanitatis
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    • v.7
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    • pp.271-289
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    • 2005
  • Dans cet article, nous discutons de certains $probl{\grave{e}}mes$ syntaxiques en ayant recours $\grave{a}$ la $th{\acute{e}}orie$ linguistique de Milner. Nous remettons en question $l'ind{\acute{e}}pendance$ et $l'identit{\acute{e}}$ de la structure syntaxique, la relation entre le plan syntaxique et le plan lexical, le $caract{\grave{e}}re$ de la $g{\acute{e}}om{\acute{e}}trie$ de la syntaxe, etc.. La discussion est non seulement linguistique mais aussi interdisciplinaire et ${\acute{e}}pist{\acute{e}}mologique$, dans la mesure $o{\grave{u}}$ nous examinons la nature de $l'entit{\acute{e}}$ syntaxique et la $m{\acute{e}}thode$ "scientifique" de la syntaxe qui donne $acc{\grave{e}}s$ $\grave{a}$ $l'entit{\acute{e}}$ syntaxique. Selon Milner, il faut distinguer la place du terme lexical avec la position syntaxique qui est $l'entit{\acute{e}}$ syntaxique. La $premi{\grave{e}}re$ n'est pas syntaxique $\grave{a}$ strictement parler, mais elle, observable contrairement $\grave{a}$ la seconde, sert $\grave{a}$ conjecturer la dimension syntaxique, $c'est-\grave{a}-dire$ le $syst{\grave{e}}me$ positionnel. Le dispositif $th{\acute{e}}orique$ dans la $th{\acute{e}}orie$ linguistique de Milner n'est rien d'autre que l'ensemble des propositions qui permet, en absence d'observatoire, de conjecturer le $syst{\grave{e}}me$ positionnel sur la base du $syst{\grave{e}}me$ des places. Dire $l'ind{\acute{e}}pendance$ de la structure syntaxique revient $\grave{a}$ dire qu'il y a une coupure entre le $syst{\grave{e}}me$ positionnel et le $syst{\grave{e}}me$ des places. Autrement dit, sans cette coupure, on ne peut parler de $l'ind{\acute{e}}pendance$ de la structure syntaxique. Ainsi $distingu{\acute{e}}s$, les deux $syst{\grave{e}}mes$ en cause se mettent en relation soit naturels soit non naturels ou par distorsion $d'apr{\grave{e}}s$ Milner. La relation naturelle est une relation lexico-syntaxique $n{\acute{e}}e$ au moment $o{\grave{u}}$ un terme lexical occupe une position syntaxique dont la $cat{\acute{e}}gorie$ est identique $\grave{a}$ celle de son occupant. A la $diff{\acute{e}}rence$ de cette relation d'occupation naturelle $suppos{\acute{e}}e$ chez Milner comme une tendance du langage naturel, la relation d'occupation non naturelle est "paradoxale" dans le sens $o{\grave{u}}$ elle est produite dans la rencontre plus ou moins "anomale" entre l'occupant lexical et $l'occup{\acute{e}}$ syntaxique. Le $degr{\acute{e}}$ de l'anomalie qu'une langue autorise peut ${\hat{e}}tre$ $mesur{\acute{e}}$ empiriquement et doit ${\hat{e}}tre$ $vari{\acute{e}}$ en fonction de la langue $concern{\acute{e}}e$. Le $caract{\grave{e}re$ $g{\acute{e}}om{\acute{e}}trique$ de la syntaxe $am{\grave{e}}ne$ ${\grave{a}}$ remettre en cause, entre autres, $l'empiricit{\acute{e}}$ et la $mat{\acute{e}}rialit{\acute{e}}$ de la $g{\acute{e}}om{\acute{e}}trie$ syntaxique. En ce qui concerne ces sujets, nos $th{\grave{e}}ses$ sont les suivantes : la nature de la $g{\acute{e}}om{\acute{e}}trie$ syntaxique n'est pas a priori mais empirique ; la $g{\acute{e}}om{\acute{e}}trie$ de la syntaxe peut et doit ${\hat{e}}tre$ construite $\grave{a}$ l'aide de la logique "empirique".

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Correlation between Antioxidant Capacities and Color Values in Korean Red Grape Juices (국내 적포도주스의 항산화능과 색도의 상관성)

  • Kim, Joo-Young;Seong, Gi-Un;Hwang, In-Wook;Chung, Shin-Kyo
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.44 no.8
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    • pp.1206-1211
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    • 2015
  • Grape juice is consumed worldwide and studied due to the high antioxidant activities and contents. The color of grape juice is due to the presence of phenolic compounds such as anthocyanins. Therefore, color values can be an indicator of antioxidant capacities of grape juice. However, the correlation between color values and antioxidant activities in grape juice has not been well studied. In this study, the physicochemical characteristics and correlation between color values and antioxidant capacities of Korean red grape juices (five commercial juices from market and two juices prepared in the laboratory) were investigated to estimate antioxidant capacities. Antioxidant capacities were determined by 1,1-diphenlyl-2-picrylhydrazyl radical scavenging assay, ferric ion reducing antioxidant power assay, and oxygen radical absorbance capacity assay. Total phenolic contents, total flavonoid contents, and total anthocyanin contents, including five kinds of polyphenolic compounds, were examined by high performance liquid chromatography (HPLC). The results for physicochemical properties showed similar values, except titratable acidity. The color hue values of the prepared juices were higher than those of commercial juices, which was in contrast to the lower color intensity values (P<0.05). The Hunter L, a, and b values showed almost no difference between commercial and prepared juices. The antioxidant activities and total phenolic contents of commercial juices were higher than those of prepared ones. Gallic acid, catechin, and quercetin were confirmed by HPLC in all samples. The total phenolic and total flavonoid contents showed positive correlation with antioxidant activities. In addition, antioxidant activities and contents correlated with color values. Thus, estimation of antioxidant capacity could be feasible through the spectrophotometric measurement of color values.

Effects of Butanol Fraction of Pine Needle (Pinus Densiflora) on Serum Lipid Metabolism and Oxidative Stress in Rats (솔잎의 부탄올획분이 SD계 Rats의 지질대사와 산화적 스트레스에 미치는 영향)

  • 김현숙;이지혜;최진호;박수현;김대익;김창목
    • Journal of Nutrition and Health
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    • v.35 no.3
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    • pp.296-302
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    • 2002
  • This study was designed to investigate the effects of a butanol extract of pine needles (Pinus densiflora Sieb et Zucc) on lipid metabolism and oxidative stress in rats. Twenty-eight male Sprague-Dawley (SD) rats were divided into four groups over a 45 days study period: the control group on a basic diet, and three experimental groups on three different dietary levels of the butanol fraction, specifically 25 mg (BuOH-25), 50 mg (BuOH-50), and 100 mg (BuOH-100) butanol fraction/kg body weight/day, thereby 0.025%, 0.05%, 0.1% of butanol extract of pine needles was added to basic diet respectively. At the end of the experimental period, body weights and food intakes were food intakes were not different among the four groups. Total and LDL-cholesterol levels were markedly decreased in the BuOH-25, BuOH-50, and BuOH-100 groups, respectively, as follows: 12.8%, 19.1% and 21.6% reductions in total cholesterol; and 10.2%, 15.6% and 23.7% reductions in LDL-cholesterol. However, HDL-cholesterol levels were significantly increased (by approximately 20%) in the serum of the BuOH-100 group only, compared with the control and other experimental groups. Atherogenic indices were also markedly decreased in the three experimental groups, by 24.8%, 30.4% and 36.2%, for each of the BuOH-25, BuOH-50, and BuOH-100 groups, respectively, compared with the control group. The levels of the hydroxyl radical (·OH) and of lipid peroxide (LPO) in the serum of the three experimental groups were significantly reduced, by 9.8%, 19.7% and 21.2%; and by 13.3%, 13.3% and 16.7%, for the BuOH-25, BuOH-50, and BuOH-100 groups, respectively Significant increases in serum superoxide dismutase (SOD) were observed in the BuOH-50 and BuOH-100 groups; specifically, 12.1% in the BuOH-50 group and 23.3% in the BuOH-100 group, compared with the control group. Significant increases in catalase (CAT) avtivities, of 24.7% in the BuOH-50 group and 29.2% in the BuOH-100 group, were also observed, compared to the control group. These results suggest that a butanol extract of pine needles could inhibit chronic degenerative disease through improving lipid metabolism, and could also effectively modulate the aging process attenuating oxidative stress.

Experimental Studies on Cardiac Catecholamine Content (Catecholamines에 관(關)하여 -제삼편(第三編) 심장(心臟) Catecholamines에 관(關)한 실험적(實驗的) 연구(硏究)-)

  • Lee, Woo-Choo
    • The Korean Journal of Pharmacology
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    • v.9 no.1
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    • pp.1-21
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    • 1973
  • During the last decade extensive studios on catecholamines have evolved new knowledge in the physiology and biochemistry of adrenergic mechanism. Cardiac muscle, receiving adrenergic fibres from the stellate, cervical and thoracic ganglia, has been repeatedly shown to have a specific capacity to uptake and to store catecholamines. The catecholamine stores in cardiac muscle have also been shown to be important sites for the action of numerous drugs. Under normal condition, a certain level of catecholamines is maintained in the stores and serves as the basis for studying the changes in the catecholamine content of the heart. Because myocardial catecholamines play such important role in the patho-physiology of the heart, it would be interesting to compare the normal level of myocardial catecholamines among various species of animals. An occasional study has dealt with myocardial catecholamines of several species add ages of animals but these have been insufficiently comprehensive to afford a basis for an understanding of the importance of these amines as related to species and ages. The present investigation was undertaken to determine whether or not there is any significance of myocardial catecholamines in the course of the evolution and development of animals. Seasonal changes, sex difference and regional and subcellular distribution of myocardial catecholamines were also examined. The concentration of cardiac catecholamines was determined by the spectrophotofluorometric procedure described by Shore and Olin. The results obtained were summarized as follows: 1. As animals phylogenetically progressed larger amounts of catecholamines were resent in their hearts. A negligibly small amount of catecholamine was present in the hearts of the clam, a non-vertebrate. Among the vertebrates, cold-blooded animals (snake, turtle, frog, eel and fish) had less myocardial catecholamines than warm-blooded animals, of which aves (fowl and duck) had less than mammalia (cat, dog, rabbit, rat, cow and pig). The ratio of norepinephrine to epinephrine also was greater as the animals progress phylogenetically. 2. Examination of the regional distribution of cardiac catecholamines in warm-blooded animals showed that the content of the auricle was generally higher than that of the septum and considerably than that of the ventricle, but the differences of contents among these regions were not so marked. 3. In the embryonic chick, cardiac catecholamines were firstly detected on the 4th day of incubation, the time before the cardiac innervation of sympathetic nerves. The concentrations of these catecholamines increased but not markedly on the 6th day of incubation, soon after the innervation of sympathetic nerves to the heart. The level of the cardiac catecholamines fluctuated throughout the remainder of embryonic development. 4. In newborn rat hearts, a considerable amount of catecholamines was present. With the development of the rats, the concentrations of myocardial catecholamines increased. The ratio of epinephrine and norepinephrine fluctuated within the range of 40 to 60 pervent. However, as development progressed, the percentage of norepinephrine continued to rise, attaining the adult value of $80{\sim}90%$ after $45{\sim}60$ days. In contrast, the total amount of epinephrine remained fairly constant throughout the animal's development. 5. No significant sexual differences were observed in the concentration of myocardial catecholamines in the developing rat. 6. The catecholamines in the rabbit hearts increased during the summer season (from May to August) and maintained a fairly constant level in the other seasons of the year. 7. The subcellular distribution of cardiac catecholamines was examined by differential centrifugation of homogenates of cardiac muscles in rabbits, cats and rats. The catecholamines were found to be present approximately 20% in particles of mitochondrial fraction, 45% in particles of microsomal fraction and 35% in soluble supernatant fraction. The particle containing catecholamines in cardiac muscle appears to be two different sizes.

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Pressor Action of Physostigmine in the Rabbit (토끼에 있어서의 Physostigmine의 혈압상승작용)

  • Kim, Je-Bong
    • The Korean Journal of Pharmacology
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    • v.26 no.2
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    • pp.101-111
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    • 1990
  • The effect of physostigmine (PS), which has been shown to act on the muscarinic receptors in the brains of the rat, dog and cat, on the arterial blood pressure (BP) was investigated in urethane-anesthetized rabbits. Intravenous (iv) PS, $25{\sim}300\;{\mu}g/kg$, caused little change in BP. However, after treatment of rabbits with either of chlorisondamine (CS), hexamethonium, intracerebroventricular (icv) clonidine, icv xylazine and icy reserpine iv PS produced a pressor response. Spinalization of the rabbit also caused iv PS to increase BP. The pressor effect of iv PS in CS-treated rabbits was markedly reduced after prazosin or pirenzepine. Iv PS inhibited the pressor response to McN-A-343 in CS-treated and in spinal rabbits; alternately during the infusion of McN-A-343 iv PS failed to produce the pressor response. The pressor response to DMPP was not affected by iv PS. Icv PS, $12{\sim}200\;{\mu}g/kg$, produced a pressor response which was accentuated after CS-treatment. This pressor effect was inhibited, though not complete, by prazosin or by pirenzepine. A simultaneous treatment of rabbits with both $[Sar^{1},\;Ala^{8}]-angiotensin$ II, an angiotensin II antagonist, and prazosin or pirenzepine almost completely abolished the pressor effect of icv PS, whereas the angiotensin II antagonist did not enhance the inhibitory effect of pirenzepine and prazosin on the pressor response to iv PS . Icv pirenzepine blocked the pressor response to icv PS without affecting that to iv PS. The present results show that the pressor response to iv PS in CS-treated and in spinal rabbits arises from stimulation of the muscarinic receptors in the sympathetic ganglia, whereas the pressor response by icv PS via activation of the muscarinic receptors in the brain which causes an enhancement in the outflow of sympathetic discharge and angiotensin. The results also suggest that iv PS is unable to produce a pressor response in the rabbit unless the sensitivity of the gangionic muscarinic receptors is altered by ganglionic nicotinic blockade, by the decrease of central sympathetic outflow on the sympathetic ganglia or by spinalization.

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Retrospective Analysis of Chief Complaints and Causes of Dogs and Cats during Emergency Visits: 3,180 Cases (응급실에 내원하는 개와 고양이의 주증과 원인에 대한 후향분석: 3,180례)

  • Lee, Hyekyung;Son, Won-Gyun;Seo, Jimin;Kim, Hyunwook;Lee, Inhyung
    • Journal of Veterinary Clinics
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    • v.31 no.2
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    • pp.90-94
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    • 2014
  • This study was performed to investigate on the frequent chief complaints and the causes of dogs and cats visiting to an emergency department, and to suggest the minimum requirements for veterinary emergency clinics in South Korea. The medical records were reviewed for 2,368 dogs and 347 cats visiting the emergency department of Haemaru Referral Animal Hospital from March 2012 to August 2013. Among them, 255 dogs and 35 cats visited more than one time and each visit was considered as an individual case. Therefore, 2,784 cases of dogs and 396 cases of cats were reviewed. The medical records were analyzed according to the criteria such as signalment, chief complaints, diagnoses, hospital admission, and outcome. In dogs, vomiting, diarrhea, or both were the most common chief complaints, followed by dyspnea, trauma, seizure, and lethargy. The most common causes of emergency visits were gastrointestinal disorders, followed by neurologic, cardiovascular, respiratory, urologic, and hematologic disorders. In cats, dyspnea was the most common chief complaint, followed by vomiting, diarrhea, or both, trauma, dysuria, and lethargy. The most common causes of emergency visits were urologic disorders followed by gastrointestinal, respiratory, infectious, and cardiovascular disorders. According to the results, vomiting, diarrhea, dyspnea, and trauma were the most frequently encountered chief complaints, which accounted for approximately 48.6% of all cases in both dogs and cats. However common causes were differed between the dogs and the cats. In order to provide proper emergency service, it is required to prepare the clinicians and facilities to diagnose and stabilize these emergency patients.

Relationship of Fitness and Substance of Porphyrin Biosynthesis Pathway in Resistant Transgenic Rice to Protoporphyrinogen Oxidase (Protox) Inhibitor (Protoporphyrinogen oxidase (Protox) 저해제 저항성 형질전환 벼의 적응성과 Porphyrin 생합성 경로물질과 관련성)

  • Yun, Young-Beom;Kwon, Oh-Do;Back, Kyoung-Whan;Lee, Do-Jin;Jung, Ha-Il;Kuk, Yong-In
    • Korean Journal of Weed Science
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    • v.31 no.2
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    • pp.134-145
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    • 2011
  • The objectives of this study were to investigate fitness difference in growth and rice yield in herbicide-transgenic rice overexpressing Myxococcus xanthus and Arabidopsis thaliana protoporphyrinogen oxidase (Protox) genes and non-transgenic rice. We also aimed to determine whether these fitness differences are related to ALA synthesizing capacity, accumulation of terapyrroles, reactive oxygen species, lipid peroxidation, and antioxidative enzymes at different growth stages of rice. Plant height of the transgenic rice overexpressing M. xanthus (MX) and A. thaliana (AP37) Protox genes at 43, 50, and 65 days after transplanting (DAT) was significantly lower than that of WT. Number of tiller of PX as well as MX and AP37 at 50 and 65 DAT was significantly lower than that of WT. At harvest time, culm length and yield of MX, PX and AP37 and rice straw weight of MX and AP37 were significantly low compared with WT. The reduction of yield in MX, PX, and AP37 was caused by spikelets per panicle and 1000 grain weight, ripened grain, spikelets per panicle, 1000 grain weight, and ripened grain, respectively. On the other hand, 135 the reduction of yield in MX, PX, and AP37 was also observed in another yearly variation experiment. The reduction of rice growth in MX, PX, and AP37 was observed in seedling stage as well as growth duration in field. There were no differences in tetrapyrrole intermediate Proto IX, Mg-Proto IX and Mg-Proto IX monomethyl ester, reactive oxygen species ($H_2O_2$ and ${O_2}^-$), MDA, antioxidative enzymes (SOD, CAT, POX, APX, and GR) and chlorophyll between transgenic lines and wild type, indicating that accumulated tetrapyrrole intermediate and other parameters were not related to growth reduction in transgenic rice. However, ALA synthesizing capacity in MX, PX, and AP37 at one day after exposure to light and 52 DAT was significantly lower than that of WT. Further study is required to elucidate the mechanisms underlying the growth and yield difference between transgenic and WT lines.

Sequential 1H MR Spectroscopy(MRS) Studies of Kaolin-Induced Hydrocephalic Cat Brain (Kaolin 유발 고양이 수두증 모델에서 양자 자기공명 분광상의 경시적 변화)

  • Kim, Myung Jin;Hwang, Sung Kyoo;Hwang, Jeong Hyun;Chang, Yongmin;Kim, Yong Sun;Kim, Seung Lae
    • Journal of Korean Neurosurgical Society
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    • v.29 no.11
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    • pp.1421-1428
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    • 2000
  • Objectives : The aim of this study is to evaluate the sequential metabolic changes in experimental hydrocephalus and the clinical applicability to the diagnosis and prognosis of hydrocephalus using proton MR spectroscopy. Methods : Hydrocephalus was experimentally induced in 30 cats(2-3kg body weight) by injecting 1ml of sterile kaolin suspension(250mg/ml) into the cisterna magna. Proton MRS was performed with a 1.5 T MRI/MRS unit (Vision Plus, Siemens) at pre-treatment and at 1, 3, 7, 14, 21, and 28 days after the kaolin injection. PRESS(TR/TE=1500/270msec) technique was employed. The major metabolites which include N-acetyl aspartate (NAA), creatine(Cr), choline(Cho), and lactate(Lac) were quantitatively analyzed and the relative concentrations ratios were evaluated. Multislice $T_2$-weighted images were also obtained using fast spin echo sequence(TR/TE= 2500/96msec) to monitor the morphologic changes along with progression of hydrocephalus. Results : Hydrocephalus was successfully induced in all 30 cats. Twenty five cats died within 3 days and one at the end of the second week. In all animals, the NAA/Cr ratios initially decreased during the acute stage. In 4 surviving cats, the NAA/Cr ratios initially decreased during the acute stage(<14 days) and then gradually increased to the prekaolin level as follows : pre-kaolin($1.49{\pm}0.04$), day 1($1.11{\pm}0.07$), day 7($1.17{\pm}0.04$), day 14($1.40{\pm}0.03$), day 21 ($1.46{\pm}0.06$), day 28($1.43{\pm}0.03$). These levels were relatively well correlated with the symptomatologic improvement. Lactate peak, which reflects the evidence of ischemia, did not appear throughout the entire period except in one case which expired at the end of the second week. Conclusions : The NAA/Cr ratio of the sequential proton MRS in kaolin-induced hydrocephalic cats reflects a metabolic aspect of the hydrocephalus at each stage. A decreased NAA level at the early stage is from both neuronal and axonal damage which may provide diagnostic information in the acute stage of hydrocephalus. In addition, the initial fall of NAA/Cr ratio and recovery in the late stage, when no lactate peak emerges, may suggest that the main insult of the parenchyma is not to the neuron itself but to the axon, which may be related to a good prognosis. However, emergence of the lactate peak and unrecoverable NAA/Cr at the end of the acute phase may be a poor prognostic factor. In the chronic stage, recovery of NAA/Cr ratio may provide a diagnostic clue for the differentiation between hydrocephalus and cortical atrophy.

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A Study on the Identification of Animal Hair in Food (식품 중 동물 털 이물의 판별법 연구)

  • Lee, Jae-Hwang;Park, Young-Eun;Lim, Byung-Chul;Kim, Ju-Shin;Choi, Jong-Hyun;Kang, Tae Sun;Lee, Jin-Ha;Kwon, Kisung
    • Journal of Food Hygiene and Safety
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    • v.32 no.1
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    • pp.57-63
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    • 2017
  • Foreign materials with a variety of types and sizes are found in food; thus, extraordinary efforts and various analytical methods are required to identify the types of foreign materials and to find out accurate causes of how they unintentionally enter food. In this study, human, cow, pig, mouse, duck, goose, dog, and cat were chosen as various types of animal hairs because they can be frequently incorporated into food during its production or consumption step. We morphologically analyzed them using stereoscopic, optical, SUMP method, and scanning electron microscopes, showing differences in each type. In addition, X-ray fluorescence spectrometer (XRF) was used to analysis chemical compositions ($^{11}Na{\sim}^{92}U$, Mass%) of samples. As a result, we observed that mammalian hairs were mainly composed of sulfur. Organic compounds of samples were further analyzed by fourier transform infrared spectroscopy (FT-IR) that can compare spectra of given materials; however, this method did not show significant differences in each sample. In this study, we suggest a rapid method for the identification of the causes and types of foreign materials in food.

Effect of Saekso 2 Corn Kernels and Cobs Extracts on Antioxidant Activity in Rats Fed High Fat-cholesterol Diet (옥수수 색소 2호 품종의 알곡과 속대 추출물을 첨가한 고지방-고콜레스테롤 식이가 흰쥐의 항산화 활성에 미치는 영향)

  • Lee, Ki Yeon;Kim, Jai Eun;Hong, Soo Young;Kim, Tae hee;Noh, Hee Sun;Kim, Si Chang;Park, Jong yeol;Ahn, Mun Seob;Kim, Hee Yeon
    • Journal of Food Hygiene and Safety
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    • v.31 no.6
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    • pp.399-405
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    • 2016
  • The objective of this study was to determine the effect of sakso 2 corn kernels and cobs extracts on antioxidant activity in rats fed a high fat-cholesterol diet (HFC) for 2 weeks. 48 male Sprague-Dawley (4-weeks-old) were randomly divided into 6 groups: normal diet (N), HFC (C), HFC and 0.05% kernel extracts of Saekso 2 (T1), HFC and 0.25% kernel extracts of Saekso 2 (T2), HFC and 0.05% cob extracts of Saekso 2 (T3), HFC and 0.25% cob extracts of Saekso 2 (T4). The weight gain in all treatment groups were significantly lower and the food efficiency ratio (FER) in all treatment groups except T3 were lower than C group. Liver index (liver weight/100 g body weight) in N group and T2 were significantly lower than C group. The level of total cholesterol in plasma of N group and T2 were significantly lower than C group and HDL-cholesterol in plasma of N group and T2 were significantly lower than C group. Malondialdehyde (MDA) concentration of thiobarbituric acid reactive substances in N group, T3 and T4 were significantly lower than C group. Activity of catalase (CAT) in all treatment groups were lower than C group. These result suggest that saekso 2 corn kernels and cobs extracts may reduce oxidative damage through the activation of antioxidative defense systems in rats fed high fat-cholesterol diets.