A chenier, about 860 m long, 30 to 60 m wide and 0.6∼1.6 m high, occurs on the upper muddy tidal flat in the Gomso bay, western coast of Korea, It consists of medium to fine sands and shells with small amounts of subangular gravels. Vertical sections across the chenier show gently landward dipping stratifications which include small-scale cross-bedded sets. the most probable source of the chenier is considered to be the intertidal sandy sediments. Vibracores taken along a line transversing the tidal flat reveal that the intertidal sand deposits are more than 5 m thick near the low-water line and become thinner toward the chenier. The most sand deposits are undertrain by tidal muds which occur behind the chenier as salt marsh deposits. C-14 age dating suggests that the sand deposits and the chenier are younger than about 1,800 years B.P. The chenier has originated from the intertidal sand shoals at the lower to mid sand flat, and has continuously moved landward. A series of aerial photographs (1967∼1989) reveal that intertidal sand shoals (predecessor of the western part of chenier) on the mid flat have continuously moved landward during the past two decades and ultimately attached to the eastern part of the chenier already anchored at the present position in the late 1960s. Repeated measurements (four times between 1991 and 1992) of morphological changes of the chenier indicate that the eastern two thirds of the chenier, mostly above the mean high water, has rarely moved whereas the western remainder below the mean high water, has moved continuously at a rate of 0.5 m/mo during the last two years (1991∼1992). This displacement rate has been considerably accelerated up to 1.0 m/mo in winter, and during a few days of typhoon in the summer of 1992 the displacement amounted to about 8∼11 m/mo for the entire chenier. these facts suggest that macro-tidal currents, coupled with winter-storm waves and infrequent strong typhoons, should play a major role for the formation and migration of chenier after 1,800 B.P., when the sea level already rose to the present position and thereafter remained constant.
In order to produce high concentration of sodium gluconate, optimization of the fermentation conditions, such as glucose concentration, inoculum size, dissolved oxygen concentration and glucose feeding method, was examined. When the glucose concentration was maintained in the range of 30∼50 g/L during the batch fermentation, glucose conversion yield and productivity were 92.2% and 6.0 g/L/hr, respectively. In the case of the low concentration below 30 g/L, the yield decreased by about 25%. As the inoculum size increased above 20%(w/v), lag phase was shortened but the productivity decreased. The dissolved oxygen level of 60∼70% was shown to be the threshold point for 75% of increase in the productivity of sodium gluconate. Finally, optimal glucose feeding rate was determined using various feeding methods such as exponential feeding, feeding based on the average glucose consumption rate and was determined using various feeding methods such as exponential feeding, feeding based on the average glucose consumption rate and on the oxygen uptake rate and etc. Our result shows that glucose feeding, based on the oxygen uptake rate is a very simple, efficient and robust method, especially when oxygen is consumed as a substrate for the bioconversion. Using the above glucose feeding strategy under the optimized condition, 255 g/L of sodium gluconate concentration, 12 g/L/hr of productivity and 95% of glucose conversion yield were achieved with A. niger ACM53.
Journal of the Korean Society of Food Science and Nutrition
/
v.43
no.3
/
pp.389-396
/
2014
The physiological properties of 70% ethanol extracts from Portulaca oleracea with different extraction methods (reflux extraction, RE; autoclave extraction, AE; low temperature high pressure extraction, LTPE) were investigated. The freeze-dried powder yields of RE, AE, and LTPE were 33.78%, 30.80%, and 11.05%, respectively. The color values of L and b were higher in LTPE, and the chroma values were higher in AE and LTPE compared to RE. The total polyphenolics and proanthocyanidin contents in LTPE were significantly higher than in other extracts. The amount of substances related to flavonoids contents was highest in RE (4.30 mg/g), followed by AE (4.06 mg/g), and LTPE (4.00 mg/g). DPPH radical scavenging ability with a concentration of 500 mg% (w/v) were in the following order; LTPE (88.87%)> RE (83.84%)> AE (80.67%). Further, the reducing power, ABTS radical scavenging ability, and nitrite scavenging activity was observed in the same tendency as seen with the DPPH radical scavenging ability. However, the ferrous ion chelating activity of RE (85.45%) and AE (83.88%) was significantly higher than that of LTPE (75.60%). ${\alpha}$-Glucosidase inhibitory activities of RE and LTPE with a concentration of 100 mg% were significantly higher than AE. Xanthine oxidase, and acetylcholinesterase inhibitory activities of LTPE were higher than the other extracts. These results suggest that the extracts from Portulaca oleracea have the potential to act as functional materials, and components of Portulaca oleracea could be effective in the prevention of Alzheimer's disease, and may be used to develop various functional food products.
Kim, Myung-Jae;Kim, Noe-Kyeong;Lee, Jung-Sang;Choi, Keun-Chul;Lee, Ryong-Woo;Kim, Kee-Won;Kang, Shin-Il
The Korean Journal of Nuclear Medicine
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v.3
no.1
/
pp.51-58
/
1969
To clarify the hematologic effects of the radioiodine ($^{131}I$) in therapeutic doses ($5{\sim}10$ mCi) on the various thyroid patients, authors studied the peripheral blood pictures of 396 goitrous patients before and after radioiodine ($^{131}I$) administrations in the Isotope Clinic of Seoul National University Hospital. Among these 396 cases of goiters, we gave 5 to 10 mCi of radioiodine ($^{131}I$) with single or fractionated administrations. The blood pictures of peripheral blood were repeated after 3 months in 40 cases of 65 cases who had been treated with $^{131}I$. The blood pictures of non-treated thyroid patients were compared with that of normal Korean values to clarify any difference between normal and goiter. The blood pictures of hyperthyroid patients treated with $^{131}I$ therapy were compared with the blood pictures of non-treated thyroid patients. The results were as following: 1) The incidence according to type: Toxic diffuse goiter: 35.4% Nontoxic nodular goiter: 29.7% Euthyroid: 13.8% Nontoxic diffuse goiter: 12.6% Hypothyroidism: 4.3% Thyroiditis($\bar{s}$ subacute form): 1.8% Toxic nodular goiter: 1.4% Malignancy: 1.0% 2) Age incidence: The range of distribution was 11 to 71 years. The peak incidence was found in the 4th decade of life. $80.6{\sim}82.6%$ of those 396 cases were found among the 3rd, 4th and the 5th decades of life. 3) Sex incidence: Sex ratio of male:female was 1:7.8. 4) The most outstanding findings in peripheral blood before treatment were decreased erythrocyte count and hemoglobin value in all types of thyroid diseases, especially in. the cases of hypothyroidism and thyroiditis. Hook worm-infested patients showed no significant difference in erythrocytes and hemoglobin values from those of other hook worm free patients. 5) Total leukocytes count was within normal range. Differential count of W.B.C. showed increased percentile of lymphocyte in diffuse toxic goiter and thyroiditis. 6) 39 cases of diffuse goiter treated with $^{131}I$ toxic showed amelioration in the anemia and restoration to normal range of lymphocyte count in association with increased percentile of neutrophiles 3 months after administration, except a case of toxic nodular goiter. One can observe anemia in slight degree, and increased lymphocytes count in hypothyroidism. Therapeutic dose of radioiodine ($^{131}I$) does not result any residual effect on the hematopoietic function. Radioiodine ($^{131}I$) therapy resulted in improvement of thyroid function in association of amelioration of pevious abnormal blood pictures. 7) Authors did not observe any myxedema resulted from radioiodine therapy during the 3 months period in this study.
Substance P is one of the neuropeptide which presents highly in tension site of periodontal ligament during the orthodontic tooth movement. It has bnn also hon as one of the neuropeptides which cause neurogenic inflammation in various tissues and organs. However, there is no report about the effect of substance P on major extracellular matrix protein, collagen production. The purpose of this study was to evaluate the collagen production by substance P in human periodontal ligament cell. The collagenase-digestion method was used to evaluate collagen production and also used Northern blot hybridization for the evaluation of collagen mRNA level. This study also Included in terms of prostanglandins and gelatinase production with respect to collagen production. For the collagen degradation, zymography was used to estimate denatured collagen degradation. Dose-dependent effect of substance P on noncollagen protein, collagen, and percent collagen was that substance P increased noncollagen protein synthesis, but decreased collagen sytnsis. So the percent collagen, which determined by relative collagen production against total protein production, w3s decreased from $7\%\;to\;3.6\%$. This inhibitory effect of substance P on collagen production was disappeared when cells were treated concomitantly with indomethacin. It means that substance P-induced inhibitory effect on collagen production was due at least in part to the production of prostaglandins. To evaluate whether substance P-induced inhibitory effect on collagen production is correspond to the steady-state levels of procollagen mRNA, Northern blot hybridization was performed and it showed that substance P has no effect on the steady-slate level of ${\alpha}1(I)$ procollagen mRNA. It means that the inhibitory effect of substance P on collagen production was due to the change of a certain mechanism after posttranscription. In this context, gelatinase production by substance P in periodontal ligament cells was evaluated by zymography. Zymogram showed that substance P has no effect on gelatinase production in periodontal ligament cells. To explore wheter substance P-induced inhibitory effect on collagen production is selevtive in periodontal ligament cells or not, MC3T3-E1 cells which originated from mouse calvaria was used. It showed that substance P has no effect on collagen production in MC3T3-E1 cells. Taken together, substance P inhibits collagen production in human periodontal ligament cells. This effect was not due to the change of the steady-state level of procollagen mRNA and gelatinase production, but due at least in part to the change of prostaglandins production.
A total of 22 Leptospiua inlermgans field isolates from the ~ a t s captured in 5 provinces of Korea in 1996, and 6 antigenically closely related relerence serovars of lai, yeonchon, birkini. gem, mwogolo. and canicola were analysed. When the antigenic characteristics were analysed by reactivity with 7 monoclonal antibodies prepared with sh.ains belongng to serogroup Icterohaemorrhagiae. all 22 isolates showed the same reaction pattern with that of serovar lai. Large restriction fragment patterns obtained after cleavage of geno~nic DNAs with infrequently cuttimg restriction enzymes were analyzed by pulsed-field pel electrophoresis(PFGE). Identification of leptospira strains by PFGE with Nor I, Asc I or Iise I digests correlated with their antigenically typed serovars, silh a few exceptions. PFGE of isolates, except for JR89, digested wjth Nor I showed identical pattern w~th serovar lai, showing 13 Cragments between 940 kb and 63 kb. When PFGE pallerns of JR89 were compared with those of serovar lai, Not I digest showed additional two hands of 1000 kb and 460 kb, while Asc I digest showed 650 kb fragment and Fse I digest did not show the fragment of 280 kb. Whereas serovar yeonchon. which was isolated in Korea and identified as a new serovar previously. could be differentiated from serovar lai in antigenic reactivities with monoclonal antibodres. it showed the similar PFGE pattern with serovar lai includin~ reference and field isolates. It was suggested that Korean leptospiral field isolates are closely related in DNA level.
This study was conducted to investigate the effects of dietary full-fat soybeans and linseed as fat sources on in vitro ruminal disappearances of dry matter and unsaturated fatty acids and fatty acids profile. The full-fat soybeans and linseed were high in linoleic acid (C18:2n-6) and $\alpha$-linolenic acid (C18:3n-3), respectively. The incubation times were 0, 3, 6, 12, 24, 48 and 72 h. After each time of incubation, medium digesta was lyophilized for analyzing its DM and fatty acids contents. DM disappearance was significantly higher in linseed treatment compared to full-fat soybeans treatment on 6 h (p<0.01), 12 h (p<0.05) and 24 h (p<0.01), but cumulative gas production was not significantly different between both treatments. Stearic acid (C18:0) content in medium digesta was increased in both soybeans and linseed as a result of complete biohydrogenation with increased incubation time and C18:0 and C18:1 contents of full-fat soybeans were significantly higher than those of linseed (p<0.05). The content of C18:2 and C18:3 in digesta of each treatment were decreased by biohydrogenation as incubation time was increased. The content of C18:2 in full-fat soybeans was significantly higher than that of linseed (p<0.05) while the content of C18:3 in linseed was significantly higher than that of full-fat soybeans (p<0.001). Net C18:0 production was significantly higher in full-fat soybeans (332.24%) than linseed (133.16%) on 72 h. Disappearance of C18:1 was significantly lower in full-fat soybeans than linseed (p<0.05), especially full-fat soybeans showed negative (-) values on 3, 6, 12 and 24 h. The disappearance of C18:3 was significantly higher in linseed than full-fat soybeans (p<0.05). The disappearance of C18-unsaturated fatty acid was significantly higher in linseed than full-fat soybeans. In conclusion, polyunsaturated fatty acid (PUFA) in both full-fat soybeans and linseed were extensively biohydrogenated. In addition, biohydrogenation of PUFA was more completed to C18:0 in full-fat soybeans than linseed, reflecting dietary PUFA composition.
This study was conducted to evaluate effects of dietary pine cone meal on growth performance, blood characteristics, carcass quality and fecal noxious gases compounds in finishing pigs. The total of sixty [(Landrace×Yorkshire)×Duroc] pigs(86.01±0.25kg in average initial body weight) were used in 35 days assay. Dietary treatments included 1) T1(2% cottonwood sawdust), 2) T2(1% cottonwood sawdust+1% pine cone meal) and 3) T3(2% pine cone meal). There were three dietary treatments with five replicate pens per treatment and four pigs per pen. During the overall periods, there were no significant differences in ADG(Average daily gain), ADFI(Average daily feed intake) and gain/feed ratio among treatments (P>0.05). Also, Nutrient digestibilities and blood characteristics were not affected by dietary treatments. At the end of this experiment, a*-value of logissimus dorsi muscle color and sensory evaluation color were higher in T3 treatment than T1 treatment(P<0.05). In fatty acid contents of lean, C18:1 and total MUFA were significantly lower in T1 treatment than other treatments(P<0.05). However, total ω6 and total PUFA were higher in T1 treatment than T2 treatment(P<0.05). In fatty acid contents of fats, total SFA was significantly higher in T2 treatment than T3 treatment(P<0.05). C18:1 was higher in T2 treatment than T1 treatment(P<0.05). There were no significant differences in fecal noxious gas compounds among the treatments. In conclusion, the results of the experiment was affected by dietary supplementation of pine cone meal on meat color and fatty acid composition of pork in finishing pigs.
Two experiments were carried out to investigate the effects of level and feeding period of dietary Monascus culture on the performance and cholesterol content of serum and meat in broilers and growing ducks.0.0(C), 0.5(T1), 1.0(T2) and $1.5\%(T3)$ of iwonascus culture which contained 0.5% monacolin-k was added to commercial broiler diets, respectively, and ffd during 2~6 weeks of age in Experiment 1. In Experilnent 2, commercial broiler diet added $1.0\%$ of Monascus culture was fed during $6\~6(C),\;4\~6(T1),\;2\~6(T2)\;and\;0\~6(T3)$ weeks of age, respectively. Three replicates of 16 day-old broilers and 10 day-old growing ducks each were randomly assigned to floor pen, respectively. In Experiment 1, as the level of dietary Monascus culture increased, body weight and feed intake of broilers significantly decreased (P<0.05), whereas those of growing ducks tended to increase without significant differences among treatments. Feed/gain ratio both in broilers and growing ducks showed a trend to increase. Cholesterol contents of serum both in broilers and growing ducks significantly decreased(P<0.05), and those of breast and thigh meat tended to decrease as the level of dietary Monascus culture increased. In Experiment 2, as the feeding period of dietary Monascus culture increased, body weight gain(P<0.05) and feed intake of broilers tended to decrease whereas those of growing ducks increased without significant differences anions treatments. Feed/gain ratio also increased without significant differences. Cholesterol contents of serum both in broilers and growing ducks significantly decreased(P<0.05), and those of breast and thigh meat tended to decrease as the feeding period of dietary Monascus culture increased without significant differences.
Kim, H.J.;Cho, J.H.;Chen, Y.J.;Kim, H.J.;Yoo, J.S.;Wang, W.;Sim, J.M.;Kim, I.H.
Korean Journal of Poultry Science
/
v.35
no.2
/
pp.123-129
/
2008
This study was conducted to investigate the effects of antibiotic and yeast supplemental high energy diet on growth performance, blood characteristics and carcass trait in broilers. Total of four hundred-eighty broilers were randomly allocated into three treatments with eight replications for five weeks. Dietary treatments included 1) CON (control; basal diet), 2) HED (high energy diet) and 3) YD (HED; yeast added to HED instead of virginiamycin, Sacchromyces cerevisiae, $15{\times}10^{10}$). During whole period, weight gain had high tendency in HED treatment. However, there were not significant among treatments (P>0.05). Feed intake was higher in YD treatment than others. However, there were not significant among each treatments (P>0.05). Feed/Gain ratio was significantly lower in HED treatment than others (P<0.05). In blood characteristics, RBC, WBC and lymphocyte were not significant (P>0.05) among treatments. Liver weigh, LW/BW ratio, leg meat weigh, LMW/BW ratio, breast meat weigh, BMW/BW ratio, abdominal fat weigh and AF/BW ratio were not significant (P>0.05). However, body weight was improved (P<0.05) in HED treatment. In conclusion, this experiment is shown that HED treatment affects Feed/Gain ratio and body weight at final period in broilers.
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