• Title/Summary/Keyword: plant uptake

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A study on advanced treatment of domestic wastewater nutrient removal by using Biosorption (생흡착을 이용한 생활하수의 염양염류제거에 관한 고도처리 연구)

  • Park, Ju-Seok;Kim, Hyun-Kab;An, Chang-Hwan;Whang, Jung-Ki;Ahn, Sang-Jun
    • Journal of Korean Society of Water and Wastewater
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    • v.13 no.3
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    • pp.29-35
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    • 1999
  • The purpose of this study is to remove the organics, nitrogen and phosphorus using biosorption for the domestic sewage. The new process using biosorption is based on the methods of contact-stabilization, which remove the organics by absorbing them to the surface of the microorganism in the activated sludge. This process consists of biosorption reactor, biosorption clarifier, nitrifying reactor, nitrifying clarifier, denitrifying reactor, phosphorus uptake(polishing) reactor and final clarifier. The efficiency of removal could be reached 91% for organics, 76% for nitrogen, 90% for phosphorus in Eujungbu pilot plant. We operated the plant which irrigated $10m^3$ per day for sewage. During our operation the HRT(Hydraulic Retention time) was maintained for 10.5hr, but it could be reduced as 8.5hr according to our operation results.

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Effect of Alum Sludge Compost of Water Treatment Plant on the Growth of Korean Lawngrass (Zoysia japonica Steud.) (정수장 슬러지 퇴비가 한국잔디(zoysia japonica Steud)의 생육에 미치는 영향)

  • 함선규;이정재;장기운;박재선
    • Asian Journal of Turfgrass Science
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    • v.8 no.2
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    • pp.93-100
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    • 1994
  • This experiment was carried our in order to study effect of alum sludge compost of water treat-ment plant on the growth of Korean lawngrass (zoysia japonica Steud.) and on the change of soil chemical properties. Alum sludge compost was made out of chicken feces, sawdust and alum sludge. The results obtained are summarized as follows : 1. Alum sludge compost was appropriate for organic fertilizer of turfgrass management in golf course. 2.Application of alum sludge compost improved the chemical properties of soil such as pH, available phosphorous and exchangeable calcium. Also the growth of Korean lawngrass grown by the mixed application of alum and compost was more effective than that in single application of compost. 3.Chlorophyll content of Korean lawngrass had no differences in several treatments. 4. Alum promoted the uptake of potassium, calcium and the yield of dry weight hut the yield of dry weight was not affected by chemical fertilizer. 5.Alumimum toxicity was decreased by the mixed application of alum and compost but increased by single application of alum.

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A Comparative Study on the Nitrogen Metabolism of Symbiotic Chlorella from Paramecium bursaria with Chlorella ellipsoidea (Paramecium bursaria와 공생하는 Chlorella와 Chlorella ellipsoidea의 질소대사에 관한 비교연구)

  • 장남기
    • Journal of Plant Biology
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    • v.29 no.3
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    • pp.145-156
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    • 1986
  • The excretion of ammonia and glutamine synthetase activities were measured in aposymbiotic Paramecium and symbiotic Paramecium. The uptake of nitrate and ammonia, and specific enzyme activities of nitrate reductase, glutamate dehydrogenase and glutamine synthetase were investigated in symbiotic Chlorella from Paramecium bursaria and Chlorella ellipsoidea. The ammonia concentration in the culture media of aposymbiotic Paramecium was increased according to the growth of the Paramecium but it was not changed in symbiotic Paramecium. Nitrate, the major nitrogen source, was taken up at a rate of 0.635 nmol/ 106 Chlorella/hr in Chlorella ellipsoidea. Most of ammonia was assimilated to glutamine by glutamine synthetase, of which acitivty was 1,467 $\mu$mol/mg protein/min in Chlorella elliposidea. Contrary to Chlorella ellipsoidea, ammonia and glutamine transported from the Paramecium were the nitrogen source of symbiotic Chlorella and ammonia was taken up at a rate of 3.854 nmo./106 Chlorella/hr into synmbiotic Chlorella. Most of ammonia were assimilated to glutamate by glutamate dehydrogenase in symbiotic Chlorella. The glutamate dehydrogenase (GDH/NADH) activity was 0.851 $\mu$mol/mg protein/min.

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Impairment of Polar Auxin Trnaport by Protein Kinase Inhibitors in Etiolated Pea Seedlings

  • Nam, Myung Hee;Kang, Bin G.
    • Journal of Plant Biology
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    • v.38 no.4
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    • pp.343-348
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    • 1995
  • Treatment of Pisum sativum tissue with the protein kinase inhibitor staurosphorine resulted in impairment of 3H-indoleacetic acid transport in etiolated stem segments. The transport inhibitiion was accompanied by an increase in net uptake of labeled auxin in the tissue. The magnitude of auxin accumulation in tissue treated with the phytotropin N-1-naphthylphthalaic acid (NPA) which specifically blocks the efflux of auxin in the plasma membrane was reduced by the protein kinase inhibitor, suggesting that inhibition of protein phosphorylation could lead to hindrance of the auxin-exporting function of NPA receptors. The flavonoid genistein which is also known to inhibit protein kinase likewise reduced NPA-induced auxin accumulation. However, the flavonoid did not bring about auxin accumulation by itself, nor did it inhibit auxin transport. In view of the finding that the flavonoid also competes with NPA for a common binding site, a mechanism for the flavonoid effect on the NPA action will be proposed.

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Uptake and Translocation of Heavy Metals to Rice Plant on Paddy Soils in "Top-Rice" Cultivation Areas (탑라이스 생산지역 논 토양 중 잔류중금속의 벼 흡수이행)

  • Park, Sang-Won;Yang, Ju-Seok;Ryu, Seung-Won;Kim, Dae-Yeon;Shin, Joung-Du;Kim, Won-Il;Choi, Ju-Hyeon;Kim, Sun-Lim;Saint, Andrew Flynn
    • Korean Journal of Environmental Agriculture
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    • v.28 no.2
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    • pp.131-138
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    • 2009
  • Heavy metal residues in soil, rice straw, unhulled rice, rice hull, polished rice, and rice barn on the rice paddy in the "Top rice production complex which is non-contaminated area were evaluated. It was observed that the average concentrations of As, Cd, Cu, Pb, and Hg in the paddy soils were 1.235, 0.094, 4.412, 4.728 and 0.0279 mg/kg, respectively. There were no cultivation areas exceeded of the threshold for soil contamination designated by "The Soil Environment Conservation Law" in Korea. For the polished rice, there were no samples exceeded of a permissible level of heavy metal residues such as 0.051 mg/kg of As, 0.040 mg/kg of Cd, 0.345 mg/kg of Cu, 0.065 mg/kg of Pb and 0.0015 mg/kg of Hg. For the uptake and translocation of heavy metals to rice plant, a main part of heavy metal accumulation was rice straw, and then rice bran. Furthermore, it shown that accumulation of heavy metals in unhulled rice, rice hulls, brown rice, and polished rice was approximately similar as low. The slopes of translocation of heavy metals from soil to polished rice were following order as Cd, 0.4321 > Cu, 0.054 ${\fallingdotseq}$ Hg, 0.052 > As, 0.021 > Pb, 0.008. It was observed that potential ability of Cd uptake in rice plant and then its translocation into polished rice was very high. Concentrations of copper and mercury absorbed in the rice plant were moderate for translocating into the polished rice, while the arsenic and lead in the plant were scarcely translocated into the polished rice. The distribution of heavy metals absorbed and translocated into aboveground parts of rice plant was appeared that there were remained at 63.3-93.4% in rice straw, 6.6-36.9% in unhulled rice, 0.6-5.7% in rice hulls, 3.2-31.3% in brown rice, 0.8-4.6% in rice bran and 1.1-26.7% in polished rice. The accumulation ratio of Cd in the aboveground parts of rice plant was remained at 26.7-31.3% in brown and polished rice.

Effect of Potassium and Sulfur Powder on the Growth of Peanut Plant in Sandy Soil of Nak-dong Riverside (낙동강유역(洛東江流域) 사질(砂質)땅콩재배지(栽培地) 가리(加里) 및 유황분말(硫黃粉末) 시용효과(施用效果))

  • Kim, Chang-Bae;Park, Seon-Do;Park, No-Kwuan;Choi, Dae-Ung;Son, Sam-Gon
    • Korean Journal of Soil Science and Fertilizer
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    • v.20 no.2
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    • pp.161-168
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    • 1987
  • This study was conducted to evaluate the effects of potassium and sulfur power levels on the growth, nutrients' uptake at different growing stage and seed yield of peanut plant and changes of soil chamical properties in a sandy peanut cultivated soil of Nak-dong riverside in 1984. 1. The length of main stem, that of branch NO. and NO. of branches per plant were increased by the increased application of potassium and sulfur powdar. Especially sulfur powder treated plot were shown in positive effect with obtained in main root length, NO. of roots and Wt. of noudles formed per plant, roots' weight of peanut plant was much more than top's Wt. at harvesting stage, and so ratio of dry matter Wt. top/root was low. 2. The noudle's Wt. formed was positively significant recognized with dry matter Wt. of peanut plant at harvesting stage and the treatments of potassium were increased 7-20% compared with potassium non-treated plot and sulfur's treatments were increased 4-13% than that of potassium 15kg/10a treatment which was sulfur's non-treated plot in seed yield. 3. Relationship between all nutrients' uptake at flowering stage and seed yield were positively significant recognized, but $P_2O_5$ uptake and N/S ratio showed negative effect at harvesting stage of peanut plant. 4. By the increase of potassium and sulfur powder application, the soil pH at two different stages were almost not differential and the content of K, $P_2O$ and $SO_4$ in soil and $SO_4/P_2O_5$ ratio were increasing tendency.

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Water Treatment Using Constructed Wetlands and Research Perspectives in Korea (인공습지를 이용한 수처리 효율 및 향후 연구제언)

  • Gang, Ho-Jeong;Song, Geun-Ye
    • Journal of Wetlands Research
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    • v.6 no.2
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    • pp.57-63
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    • 2004
  • More than 1000 natural and constructed wetlands have been used to improve water quality. The general results showed that the highest removal efficiency was 84% for BOD and the lowest one was 48% for total nitrogen concentration. In addition, total phosphous removal efficiency was 67%, and the removal efficiencies are related to inflow loading. Researches donducted in Korea have focused on input-output mass balance and uptake by aquatic plant. As such little information if available about complex processes regulating water quality and role of microbes. Therefore, to determine the optimal design for construct, and methods to operate constructed wetland, researches about complex mechanisms of contaminant removal and interdisciplinary researches are necessary.

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Combined Effect of 2,4,6-trinitrotoluene(TNT) and Cadmium on Uptake and Phytotransformation of TNT by Abutilion avicennae (TNT(2,4,6-trinitrotoluene)와 카드뮴의 복합오염이 어저귀의 TNT흡수 및 생물학적 전환에 미치는 영향)

  • Kim, Sun-Young;Bae, Bum-Han;Chang, Yoon-Young;Lee, In-Sook
    • The Korean Journal of Ecology
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    • v.25 no.3 s.107
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    • pp.139-144
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    • 2002
  • Most of army depots contaminated with co-contaminants, 2,4,6-trinitrotoluene(TNT) and heavy metals. In phytoremediation for the TNT, heavy metals may inhibit mineralization, transformation and sequestration of TNT by the plant. We studied effect of cadmium on TNT degradation and transformation by Abutilion avicennae in hydroponic cultures. When cultured in 20 mgTNT/L and 1.3 mgCd/L, the plant displayed phytotoxicities; reduction of leaf fresh, leaf roil, chlorosis, leaf loss and fresh weight loss. Phytotoxicity was severer in the combined contaminants than in single contaminant. Because A. avicennae uptake just a little cadmium, 1.3 mgCd/L included in the TNT medium did not influece significantly TNT transformation, translocation and distribution by A. avicennae. Therefore, the soil solution containing cadmium would not affect TNT degradation by Abutilion avicennae in Army depots polluted with TNT.

Improvement of K+ and Na+ Ion homeostasis and salt tolerance by Co-inoculation of arbuscular mycorrhizal fungi (AMF) and spore associated bacteria (SAB)

  • Selvakumar, Gopal;Kim, Kiyoon;Roy, C. Aritra;Jeon, Sunyong;Sa, Tongmin
    • Proceedings of the Korean Society of Crop Science Conference
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    • 2017.06a
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    • pp.246-246
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    • 2017
  • Salinity inhibits plant growth and restricts the efficiency of arbuscular mycorrhizal fungi. The selective uptake of nutrients from the soil and their effective transport to host roots make it essential for plant growth and development under salt stress. AMF spore associated bacteria shown to improve mycorrhizal efficiency under stress. Thus, this study aimed to understand the co-inoculation efficiency of AMF and SAB on maize growth and ion homeostasis under salt stress. Two AMF strains and one SAB were inoculated with maize either alone or in combination with one another. The results of our study showed that AMF and SAB co-inoculation significantly improved dry weight and nutrient uptake of maize under salt stress. Co-inoculation significantly reduced proline accumulation in shoots and Na+ accumulation in roots. Co-inoculation treatment also exhibited the high K+/Na+ ratios in roots at 25 mM NaCl. Mycorrhizal colonization showed positive influence for regulation of ZmAKT2, ZmSOS1 and ZmSKOR gene expressions, contributing to K+ and Na+ ion homeostasis. CLSM view showed that SAB were able move and localize into inter and intra cellular spaces of maize roots. In addition, CLSM view of AMF spores showed that gfp-tagged SAB also associated on the spore outer hyaline layer.

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Detection of Antiinflammatory Agents from Natural Products as Inhibitors of Cyclooxygenase I and II

  • Lee, Dong-Hee;Kang, Sam-Sik;Chang, Il-Moo;Mar, Woong-Chon
    • Natural Product Sciences
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    • v.3 no.1
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    • pp.19-28
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    • 1997
  • Constitutive cyclooxygenase (COX-I) is present in cells under physiological conditions, whereas inducible cyclooxygenase (COX-II) is induced by some cytokines, mitogens, and endotoxin presumably in pathological conditions such as inflammation. We have evaluated the inhibitory effects of solvent fractionated extracts of natural products on the activities of COX-I and COX-II. Oxygen uptake COX assay was performed, as a primary screening from the tissue extracts of bovine seminal vesicles (BSV), by monitoring the initial rate of oxygen uptake using an oxygen electrode. Additionally, we evaluated plant extracts for the inhibitory effects of COX-I (in HEL cells) and COX-II (in lipopolysaccharide activated J774A.1 macrophages) using thin layer chromatography of prostanoids produced from $^{14}C-labelled$ arachidonic acid (AA). The use of such models of COX-I and COX-II assay will lead to the identification of specific inhibitors of cyclooxygenases with presumably less side effects than present therapies. Inhibitory effects of 50 kinds of plant extracts on the COX-I and COX-II activities were determined and the active fractions were found in the ethyl acetate fractions of Dryopteris crassirhizoma (roots), Amomum cardamomum (roots), Triticum aestivum (seeds), Perilla sikokiana (leaves), Anemarrhena asphodeloides (roots). Especially, the ethyl acetate fraction of Dryopteris crassirhizoma (roots), which exhibited the strong inhibition against BSV COX $(IC_{50},\;65.4\;{\mu}g/ml)$, COX-I $(IC_{50},\;8.5\;{\mu}g/ml)$, and COX-II $(IC_{50},\;17.2\;{\mu}g/ml)$, is under investigation to isolate active principles using activity-guided fractionation method.

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