• Journal of Preventive Medicine and Public Health
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• v.23 no.3 s.31
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• pp.309-315
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• 1990

The purpose of this study was to evaluate the effect of zinc administration on the autistic children. The subject diagnosed as infantile autism were 24 male and 10 female children of a special school in Taegu city. Control group were selected from 1:2 ratio matched with cases on sex and age. The results were as followings. In female autistic group, the mean content of zinc in hair was significantly lower than control group, but in male the result was inverse at all age group. The content of zinc in hair showed significant correlation with age in male autistic group and control group. Zinc content of hair, age and sex accounted for 37.2% of the variance of autistic score and the most significant variable was zinc content. Autistic group were divided into two group. Group I which zinc content of hair below 150 ppm were administrated with multi-vitamin contained 10 mg of zinc, Group II which zinc content of hair above 150 ppm were administrated with placebo. Total administration period was eight weeks. In zinc administration group, there was a decreasing tendency of autistic score as the zinc content of hair was increased but the relationship was not statistically significant.

• Food Science of Animal Resources
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• v.27 no.3
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• pp.284-289
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• 2007

This study was conducted to investigate the effects of copper and zinc supplementation on growth performance, nutrient digestibility, and meat and carcass characteristics in finishing pigs. A total of 72 $(Landrace{\times}Yorkshire{\times}Duroc)$ pigs (58.47 kg initial BW) were assigned to 6 treatments in a $2{\times}3$ factorial design $(Zn\;levels{\times}Cu\;levels)$. The sources of zinc and copper were Zn-methionine chelate and Cu-methionine chelate, respectively. Zinc levels used were 80 and 120 ppm and copper levels used were 10, 30 and 60 ppm. Throughout the entire experimental period, the average daily gain (ADG) and average daily feed intake (ADFI) were not significantly affected by Cu or Zn levels, or their relative levels. The G:F ratio was significantly affected by the relative levels of Cu and Zn (p<0.05), specifically at 30 ppm Cu and 120 ppm Zn. Dry matter digestibility was significantly affected by the levels of Cu (p<0.02), Zn (p<0.01) and the relative levels of each (p<0.04), in particular at 30 ppm Cu and 120 ppm Zn. Nitrogen digestibility was significantly affected by Zn levels (p<0.01) and the combination of 30 ppm Cu and 120 ppm Zn (p<0.03). The $L^*-value$, shear force, cooking loss and pH were not significantly affected by Cu levels, Zn levels or their combination. The $a^*- (p<0.04)\;and\;b^*- values (p<0.01)$ were significantly affected by Zn levels at 80 ppm. The Water hoding capacity was significantly affected by Cu and Zn in combination (p<0.01) at 10 ppm Cu and 120ppm Zn. The carcass weight, backfat thickness and carcass grade were not significantly affected by Cu levels, Zn levels or their relative levels. The carcass percentage was significantly affected by the combination (p<0.04) of 30ppm Cu and 120ppm Zn. In conclusion, dietary supplementation of Cu and Zn at 30 and 120 ppm, respectively, is effective for feed efficiency, nutrient digestibility and carcass percentage, while at the levels of Cu at 10 ppm and Zn at 120 ppm have effects on WHC.

• Journal of the East Asian Society of Dietary Life
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• v.9 no.1
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• pp.17-26
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• 1999

This study was conducted to investigate the effect of Zn and Fe levels on lipid metabolism and micromineral contents in high fat diet-induced obese rats. Male sprague-dawley rats weighing approximately 100g were fed a normal or high fat diet. After 10 weeks high fat diet, rats were fed different levels of Zn and Fe. Serum triacyglycerol and HDL-cholesterol were affected to Zn and Fe levels in normal group. The micromineral (Zn, Fe, Cu, Mn) contents in liver were significantly different in high fat diet group by Zn intake levels and in normal diet group by Fe intake levels. However, micromineral contents in kidneys were not affected to different levels of Fe in both obese and normal rats. There were no differences in spleens of obese rats fed high fat diet according to Zn and Fe intake levels. But in normal group, Mn content of spleen were exclusively affected to Zn levels.

• Korean Journal of Environmental Agriculture
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• v.16 no.3
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• pp.245-248
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• 1997

The study was carried out to elucidate the changes of ${\alpha}-amylase$ activity and free proline content for zinc toxicity in two rice cultivars(Ilpumbyeo and Namchunbyeo) during germination and early growth stages. Plant height in all kinetin treatments was promoted but zinc 120ppm treatment was decreased. Soaking treatment of kinetin $10^{-3}M$ increased germination rate of both cultivars, Ilpumbyeo and Namchunbyeo by 95% and 96% as compared with zinc 120ppm. Chlorophyll content of Ilpumbyeo was higher than that of Namchunbyeo. Activity of ${\alpha}-amylase$ in kinetin $10^{-3}M$ of both rice cultivars was most highest in the 3days after treatment of zinc 120ppm. Free proline content in all rice cultivars of zinc 120ppm treatment was sharply increased at the 3days after treatment of zinc 120ppm. As a result, the effects of kinetin treatment were recognized to promote the plant height and germination rate under zinc toxicity(120ppm) during rice seed germination and early growth stages.

• Journal of the Korean Society of Food Science and Nutrition
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• v.38 no.8
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• pp.1037-1041
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• 2009

The effect of dietary zinc levels on macro mineral contents was investigated in rats. Rats were divided into three groups by zinc levels, such as low (50% of requirement, Zn/L), adequate (100%, Zn/A) and high (200%, Zn/H) levels of dietary zinc. The calcium, magnesium, sodium and potassium contents in serum and organs were measured. The food intake was significantly higher in Zn/L group compared to that of Zn/H group. The body weight gain in Zn/H group was significantly lower than that of other two groups. There were no significant differences in liver, kidney and spleen weights. Also, serum calcium, magnesium, sodium and potassium concentrations were not significantly changed by the zinc diet at any level. In the low zinc diet group, liver calcium content was significantly lower, but the magnesium and potassium contents in spleen were significantly higher than that in other groups. The calcium, magnesium, sodium and potassium contents of kidney were not significantly different for any level of zinc. In conclusion, the macro mineral contents of liver and spleen in the normal rats were changed by zinc levels. Based on this study, the interaction between micro and macro minerals remains to be further studied.

• Economic and Environmental Geology
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• v.52 no.2
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• pp.129-139
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• 2019

This study investigates the spectral response of red lettuce (Lactuca sativa var crispa L.) to Zn concentration. The control group and the experimental groups treated with 1 mM(ZnT1), 5 mM(ZnT2), 10 mM(ZnT3), 50 mM(ZnT4), and 100 mM(ZnT5) were prepared for a pot experiment. Then, Zn concentration and spectral reflectance were measured for the different levels of Zn concentration in red lettuce. The Zn concentration of the control group had the range of 134-181 mg/kg, which was within the normal range of Zn concentration in uncontaminated crops. However, Zn concentration in the experimental group gradually increased with an increase in concentration of Zn injection. The spectral reflectance of red lettuce showed high peak in the red band due to anthocyanin, high reflectance in the infrared band due to the scattering effect of the cell structure, and absorption features associated with water. As Zn concentration in red lettuce leaves increased, the reflectance increased in the green and red bands and the reflectance decreased in the infrared band. The correlation analysis between Zn concentration and spectral reflectance showed that the reflectance of 700-1300 nm had a significant negative correlation with Zn concentration. The spectral band is a wavelength region closely related to the cell structure in the leaf, indicating possible cell destruction of leaf structure due to increased Zn concentration. In particular, 700-800 nm reflectance of the infrared band showed the strongest correlation with the Zn concentration. This study could be used to investigate the heavy metal contamination in soil around mining and agriculture area by spectroscopically recognizing heavy metal pollution of plant.

• Korean Journal of Soil Science and Fertilizer
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• v.5 no.1
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• pp.41-47
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• 1972

An experiment was conducted to study the zinc deficiency of rice plant grown on Boeun soil of Korea and on Batangas soil of the philippines. The results obtained are summarized as follows: 1. Batangas soil was deficient in zinc because of the high pH, high organic matter and high calcium. Zinc content of the rice plant grown on Batangas soil was l6ppm. On the other hand, Boeun soil had low organic matter. Zinc content of the rice plant grown on Boeun soil was 33ppm. 2. The top leaf had higher zinc content than any other leaves. Zinc deficiency apparently occured when the zinc content of the rice plant was below 18ppm. 3. The physiologically acid fertilizer such as ammonium sulfate was more advantageous in improving zinc up take than the urea. 4. The zine deficiency was promoted when the Mn/Zn ratio is high, and zinc and manganess interact antagonistically in the growth of rice plant. 5. The zinc deficiency could be overcome by applying zinc chloride and fritted Trace elements to the Batangas soil, and the yield was significantly increased than conrtol.

• Journal of the Korean Society of Food Science and Nutrition
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• v.38 no.9
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• pp.1174-1178
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• 2009

The purpose of this study was to investigate the effect of dietary zinc levels on carbohydrate metabolism and serum zinc, magnesium and chromium contents in obese rats. Animals were divided into three groups by zinc levels, such as low (15 ppm), adequate (30 ppm) and high (60 ppm) levels of dietary zinc. The food intake, weight gain and feed efficiency ratio were not changed by zinc levels. There were no significant differences in liver, kidney and spleen weights. However, serum glucose concentration significantly decreased as the levels of dietary zinc increased, in particular, that of obese rats fed the high level of zinc was remarkably decreased. Insulin concentration of rats fed high level of zinc diet was significantly higher than that in the other groups. However, there were no significant differences in serum zinc and chromium contents, although serum magnesium fed zinc deficient diet was significantly higher than that of the other two groups. Glucose concentrations had negative correlation with insulin concentrations, and positive correlations with serum magnesium content. In conclusion, serum glucose concentrations were decreased and insulin concentrations were increased as the levels of dietary zinc increased in obese rats. These results suggested that zinc supplement at higher level than adequate one would increase insulin concentration and may improve hyperglycemia problem in obese groups.

• Analytical Science and Technology
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• v.37 no.3
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• pp.155-165
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• 2024

This study aimed to assess whether plant-based meat substitutes can effectively replace animal meat products in terms of amino acid composition and zinc bioavailability. The evaluation was conducted in response to the growing demand for meat substitutes, driven by the increasing vegan population and the expansion of vegan culture. For this purpose, a chicken product and two plant-based meat substitutes in tender form were selected. The amino acid content and composition were measured using HPLC, while the levels of trace elements like zinc and calcium were determined through ICP-AES. Additionally, the presence of phytic acid, which inhibits zinc bioavailability, was extracted and quantified using UV-Vis spectroscopy. The results were analyzed in the context of daily product consumption. The findings revealed that certain essential amino acids, such as valine and lysine, were found to be deficient in plant-based meat substitutes compared to animal meat products. It was challenging to meet the recommended daily intake of these amino acids solely through the use of meat substitutes. Regarding zinc bioavailability, the inhibitory effect of calcium on zinc bioavailability was expected to be minimal. The zinc bioavailability of the meat substitutes varied significantly depending on the zinc and phytic acid content of the ingredients. Therefore, ingredients of plant-based meat substitutes should be carefully modulated to reach appropriate zinc bioavailability by selecting and processing plant materials with high zinc and low phytic acid content.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.53-53
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• 2014

아연-마그네슘 합금은 뛰어난 내식성으로 최근 코팅소재로 가장 많이 사용되는 아연 도금을 대체할 수 있는 재료로서 주목받고 있다. 특히 PVD 방식을 통해 도금강판을 제조할 경우 도금층의 두께 제어가 용이하여 아연의 사용량을 저감할 수 있다. 그러나 이러한 PVD 방식을 통해 제조된 아연-마그네슘 도금강판을 사용하기 위해서는 내식성 이외에도 일정수준의 기계적 특성 확보가 중요하다. 본 연구에서는 마그네슘 함량을 달리하여 제조된 아연-마그네슘 도금강판을 대상으로 XRD 분석, 나노인덴테이션 시험을 실시하여, 아연-마그네슘 도금강판 도금층의 기계적 특성에 미치는 상(Phase)의 영향을 분석하였다.