• Title/Summary/Keyword: Salt-resistance

Search Result 595, Processing Time 0.168 seconds

Isolation of Agrobacterium sp. BE516 from the Root of Miscanthus sacchariflorus and Its Plant Growth Promoting Activity (물억새 뿌리로부터 Agrobacterium sp. BE516 균주의 분리 및 식물생육촉진활성)

  • Kang, Hye-Young;Park, Dong-Jin;Lee, Jae-Chan;Kwon, Mi-Kyung;Kim, Seung-Bum;Kim, Chang-Jin
    • Journal of Applied Biological Chemistry
    • /
    • v.55 no.2
    • /
    • pp.129-133
    • /
    • 2012
  • To exploit plant growth promoting bacteria in the roots of Miscanthus sacchariflorus, a biomass energy crop, total 64 bacteria were isolated. For the investigation of plant growth promoting effects from the isolated bacteria, production of indole acetic acid (IAA) and 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activities were tested and other cultural conditions were examined. As results, 8 isolates showed plant growth promoting effects on the M. sacchariflorus and an isolate designated Agrobacterium sp. BE516 has the highest activity by enhancing the shoot elongation over 2-fold than the control. Agrobacterium sp. BE516 produced 64 ${\mu}g$ IAA per mL and showed ACC deaminase activity which is involved in the resistance to environmental stress such as high salt and drought. It could grow at low temperature in the range from 4 to $15^{\circ}C$, at pH 4.0 and at 4% NaCl. These results indicate that the Agrobacterium sp. BE516 can be useful as a bio-fertilizer for M. sacchariflorus under the stressed conditions.

A Case of Autosomal Recessive Pseudohypoaldosteronism Type 1 with a Novel Mutation in the SCNN1A Gene (SCNN1A 유전자 변이로 발생한 상염색체 열성 가성 저 알도스테론증 1형 1례)

  • Kim, Su-Yon;Lee, Joo Hoon;Cheong, Hae Il;Park, Young Seo
    • Childhood Kidney Diseases
    • /
    • v.17 no.2
    • /
    • pp.137-142
    • /
    • 2013
  • Pseudohypoaldosteronism (PHA) is a condition characterized by renal salt wasting, hyperkalemia, and metabolic acidosis due to renal tubular resistance to aldosterone. Systemic PHA1 is a more severe condition caused by defective transepithelial sodium transport due to mutations in the genes encoding the ${\alpha}$ (SCNN1A), ${\beta}$ (SCNN1B), or ${\gamma}$ (SCNN1G) subunits of the epithelial sodium channel at the collecting duct, and involves the sweat glands, salivary glands, colon, and lung. Although systemic PHA1 is a rare disease, we believe that genetic studies should be performed in patients with normal renal function but with high plasma renin and aldosterone levels, without a history of potassium-sparing diuretic use or obstructive uropathy. In the present report, we describe a case of autosomal recessive PHA1 that was genetically diagnosed in a newborn after severe hyperkalemia was noted.

Durability Performance Evaluations on Resistance to Chloride Attack for Concrete Using LCD Waste Glass Powder (LCD 폐유리 미분말을 사용한 콘크리트의 염해내구성 평가)

  • Kim, Seong-Kyum;Lee, Kwang-Woon;Song, Jae-Ho;Jang, Il-Young
    • Journal of the Korean Recycled Construction Resources Institute
    • /
    • v.6 no.4
    • /
    • pp.289-296
    • /
    • 2018
  • In this study, we evaluated the feasibility and performance of LCD waste glass as a replacement for cement by using LCD waste glass powder which is generated from manufacturing process due to development of LCD industry. Experiments were carried out by replacing 10% and 20% cement of LCD waste glass with particle size of $12{\mu}m$ of LCD waste glass with OPC and particle size of $5{\mu}m$, respectively. Through experiments, basic properties, mechanical properties and durability of concrete were evaluated. Experimental results show that the compressive strength is high at 10% replacement ratio compared to 20%. The lower the particle size, the higher the strength. The durability test evaluated the chloride penetration performance through the chloride ion diffusion coefficient. The higher the substitution rate and the smaller the particle size, the lower the chloride ion diffusion coefficient and the better the OPC than the all substitution rate. As a result, LCD waste glass concrete with low granularity and proper replacement ratio is considered to be advantageous for durability under salt environment.

Material Characteristics and Application Efficiency of Treatments for Usuki Stone Buddha Statues in Japan (일본 우스키 석불군의 재질특성과 보존처리제 적용 효과)

  • Lee, Myeong Seong;Lee, Jae Man;Lee, Sun Myung;Kim, Sa Dug;Morii, Masayuki
    • Korean Journal of Heritage: History & Science
    • /
    • v.44 no.3
    • /
    • pp.78-91
    • /
    • 2011
  • The Usuki Stone Buddha Statues in Japan are carved on mainly dark gray welded lapilli tuff accompanied by lenticular fiamme. This rock is composed of matrix which contains feldspar and opaque minerals with some phenocrysts of quartz and feldspar. The matrix is slight to highly welded. The statues have been weathered and weakened by salt and freezing of water. To enhance the mechanical properties of the rock, consolidants and water repellents were applied. The absorption ratio of the rock was highly decreased after the treatment of the water repellents, the consolidant OH 100, as well. Ultrasonic velocity revealed similarly higher values in the treated rock by KSE 300 and OH 100, compared to non-treated rock. KSE 300, especially, highly increased the Equotip surface hardness. All studied consolidants and water repellents were found to change the original color of the stone. SNL, specifically, resulted the significant change in color. In addition, KSE 300 were observed to improve resistance to weathering such as microcrack and fracture through freezing-thawing test after treatment.

Study on the Discoloration Identified from the Column of Wooden house, Hyunchungsa(Shrine) - Focused on Influence of Microorganisms and Correlation with Strength - (현충사 옛집의 기둥 하부 변색에 관한 연구 - 미생물에 의한 영향 및 강도와의 상관관계를 중심으로 -)

  • Jeong, So-young;Seo, Min-seok;Hong, Jin-young;Kim, Soo-ji;Jeong, Ah-ruem;Kim, Ji-seo
    • Korean Journal of Heritage: History & Science
    • /
    • v.47 no.4
    • /
    • pp.58-73
    • /
    • 2014
  • In general, it is thought discoloration on wood is frequently found in decorative wood products. So this study was conducted focusing on white rot found lower parts of columns and baseboards of a wooden house, Hyunchungsa (shrine) to know whether microorganisms have any influence on discoloration or there is correlation with strength by investigating resistograph, occurrence of microorganisms and microscopy for analysis(SEM, tissue analysis etc.). The results obtained were as follows: (1) The result of measurement of resistograph showed there are little correlation between discoloration and strength though there was a spot indicating low resistance. (2) The moisture content of discolored part was relatively higher than that of normal parts, but occurrence of microorganisms was less in discolored parts while more kinds of microorganisms were identified in normal parts with high CFU(Colony Forming Unit). (3) The result of SEM (with a magnification of 500 times) on the surface of discolored parts, it was found out there are many kinds of particles in different sizes on the surface and those were composed of elements such as C, O, Si, Ca, and a small amount of Na and Cl (weight %) were detected in part. (4) The result of tissue analysis showed discoloration occurs limitedly to the outer surface of column. As these results, it is concluded that discoloration has nothing to do with strength, damage by microorganisms and salt.

Growth of Candida albicans Biofilm is Inhibited by Salvia miltiorrhiza (단삼에 의한 Candida albicans 바이오필름 발달의 억제)

  • Lee, Heung-Shick;Kim, Younhee
    • Microbiology and Biotechnology Letters
    • /
    • v.47 no.3
    • /
    • pp.465-472
    • /
    • 2019
  • Candida albicans is an opportunistic human pathogen that causes infections. Candidiasis is often related to antifungal resistance because the pathogen has the ability to form biofilms. In a previous study, we found that the Salvia miltiorriza ethanol extract demonstrated anticandidal activity by altering membrane permeability and inhibiting the cell wall synthesis in C. albicans. Our results here demonstrate that $78{\mu}g/ml$ of the S. miltiorriza extract significantly diminished the early stage biofilms formed by 10 clinical C. albicans isolates by 51.3%; this was analyzed by 2,3-Bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide salt (XTT) reduction assay. The effect of the S. miltiorrhiza extract on the adhesion of C. albicans cells to polystyrene plates and germ tube formation was examined via microscopic investigation. Although the density of the adhered cells was remarkably reduced up on incubation with $39{\mu}g/ml$ S. miltiorrhiza extract, germ tube formation by C. albicans was rarely affected. Quantitative real-time PCR analysis showed that the S. miltiorrhiza extract downregulated the expression of C. albicans hypha-specific genes, EAP1 by 34.7% (p < 0.001), ALS1 by 45.0% (p < 0.001), ALS3 by 48.1% (p < 0.001), and ECE1 by 21.3% (p = 0.006), respectively. Our data suggest that the S. miltiorrhiza ethanol extract significantly inhibited the early stage of biofilm formation by C. albicans by interfering with cell adhesion, by downregulating EAP1, ALS1 and ALS3, and presumably by modifying the cell wall and membrane structure.

Six Yeast Strains Isolated from Freshwaters for the First Record in Korea (국내 담수환경에서 분리된 국내 미기록 효모 6종 보고)

  • Yoosun Oh;Min Jeong Seo;Jaeduk Goh;Hye Yeon Mun
    • The Korean Journal of Mycology
    • /
    • v.50 no.3
    • /
    • pp.217-224
    • /
    • 2022
  • This study aimed to isolated wild yeasts from freshwater in Korea. The strains were identified by using the D1/D2 domains of the 26S rDNA regions. Consequently, six strains were named as Apiotrichum chiropterorum (NNIBRFG36995), A. domesticum (NNIBRFG32938), A. dulcitum (NNIBRFG33144), A. laibachii (NNIBRFG36991), Saprochaete quercus (NNIBRFG33183) and Tausonia pullulans (NNIBRFG33181). These yeasts have not previously been recorded in Korea, this paper is the first report. We were investigated to the morphological and cultural characteristics of these yeasts. All the strains grew well on Yeast extract peptone dextrose (YPD), Potato dextrose (PD), and Yeast mold (YM) media and in temperature range of 15-30℃. A. domesticum (NNIBRFG32938), A. laibachii (NNIBRFG36991) and T. pullulans (NNIBRFG33181) grew even in 20% glucose containing YPD medium, so they had glucose tolerance. A. domesticum (NNIBRFG32938) and A. laibachii (NNIBRFG36991) had salt resistance as growing even in 5% NaCl containing YPD medium.

A Status of Technology and Policy of Nuclear Spent Fuel Treatment in Advanced Nuclear Program Countries and Relevant Research Works in Korea (선진 원자력발전국의 사용후핵연료 처리기술 및 정책현황과 우리나라의 관련연구 현황)

  • You, Gil-Sung;Choung, Won-Myung;Ku, Jeong-Hoe;Cho, Il-Je;Kook, Dong-Hak;Kwon, Kie-Chan;Lee, Won-Kyung;Lee, Eun-Pyo;Hong, Dong-Hee;Yoon, Ji-Sup;Park, Seong-Won
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
    • /
    • v.5 no.4
    • /
    • pp.339-350
    • /
    • 2007
  • Status on the spent nuclear fuel management policy and R&D plan of the major countries is surveyed. Also the prospect of the future R&D plan is suggested. Recently so-called fuel cycle nations, which have the reprocess policy of the spent fuel, announced new spent fuel management policy based on the advanced fuel cycle technology. The policy is focused to transmute highly radioactive material and material having a very long half-life, and to recycle the Pu and U contained in the spent fuel. In this way the radio-foxily of the spent fuel as well as the amount of the high level waste to be eventually disposed can greatly be reduced. Most of countries selected the wet process as a primary option for the treatment of the spent fuel since the advanced wet process, which is based on the existing PUREX process, looks more feasible as compared with the dry process. The wet process, however, is much more sensitive in terms of proliferation-resistance compared with the dry process. The pure Pu can easily be obtained by simply modifying the process. On the other hand the pure Pu can not be extracted in the dry process based on the high temperature molten salt process such as a pyroprocess. Even though the pyroprocess technology is very premature, it has a great merit. Thus it is necessary for Korea to have a long term strategy for pursuing a spent fuel treatment technology with a proliferation resistance and a great merit for the GEN-IV fuel cycles. Pyroprocess is one of the best candidates to satisfy these purposes.

  • PDF

DETECTION OF METHICILLIN OR VANCOMYCIN-RESISTANT STAPHYLOCOCCUS AUREUS FROM DENTAL HOSPITAL (치과병원 진료실 내에서 메티실린 또는 반코마이신 저항성 Staphylococcus aureus의 검출)

  • Min, Jung-Hee;Park, Soon-Nang;Hwang, Ho-Keel;Min, Jung-Beum;Kim, Hwa-Sook;Kook, Joong-ki
    • Restorative Dentistry and Endodontics
    • /
    • v.32 no.2
    • /
    • pp.102-110
    • /
    • 2007
  • The purpose of this study was to obtain the basic information for the improvement of dental environment by investigating the presence of methicillin- or vancomycin-resistant Staphylococcus aureus (MRSA or VRSA) isolated from dental health care workers (DHCWs) and environment of the Chosun University Dental Hospital (CUDH) and a private dental clinic (control group). Staphylococcus aureus (S. aureus) was isolated from anterior nares of 42 DHCWS and 38 sites, unit chairss, x-ray devices, computers, etc., at 10 departments of the CUDH and 20 DHCWs and 11 sites at the private dental clinic. S. aureus was isolated on mannitol salt agar plate and confirmed by PCR with S. aureus species-specific primer. Antimicrobial susceptibility test of clinical isolates of S. aureus against several antibiotics including methicillin (oxacillin) was performed by investigating minimum inhibitory concentration (MIC) using broth microdilution assay. In addition, PCR was performed to detect the methicillin- or vancomycin-resistant gene. The data showed that one strain of S. aureus was isolated from DHCWs of the CUDH and three strains of S. aureus was isolated from 3 samples of the private dental clinic, respectively. All of the isolates from the CUDH and the private dental clinic had resistance to penicillin G, amoxicillin and vancomycin and susceptibility to oxacillin and ciprofloxacin. The S. aureus strains were already obtained the resistance to penicillin G and amoxicillin. These results suggest that two dental clinics were under relatively safe environment.

Studies on Change of Physico-chemical Properties due to Ripening degrees in the Reclaimed Tidle Deposits I. With reference to Munpo and Pori series (간척지토양(干拓地土壤)의 숙성화정도별(熟成化程度別) 이화학성(理化學性) 변화연구(變化硏究) I. 문포(文浦) 및 포이통(浦里統)에 관(關)하여)

  • Yoo, Chul-Hyun;Cho, Guk-Hyun;Choi, Jeong-Weon;Park, Keon-Ho;Kim, Yeong-Ho
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.22 no.3
    • /
    • pp.180-190
    • /
    • 1989
  • In order to obtain basic information on soil inprovement and management of two reclaimed paddy soils, Munpo and Pori series, this study was carried out by investigating the change of physico-chemical and soil mechanical properties. 1. In the Munpo series, the contents of salt in the soil and ground water before paddy rice transplanting at 6 years after reclamation were 0.60 and 1.84%, respectively, and the safty cultivation of paddy rice was possible after 20 years, while that of the Pori series was after 12 years. 2. In the Munpo series, the change of the soil particle size according to the ages after reclamation showed negative correlation with sandy contents, but clay contents had positive correlation both in the surface and subsurface soils. The pori series showed reverse tendency. 3. Between the N-value and Atterberg limits and the ages showed negative correlation in both Munpo and Pori series, but clay-activity showed positive. Arid the cole values showed positive correlation in the Munpo series, but negative in the Pori series. 4. Cone penetrating resistance in the surface of the Munpo series after 6 years of reclamation was 62.9, after 20 years 24.5 and $16.7kg/cm^2$ in 15cm of soil depth at depth of 22.5cm after 27 years. In the Pori series, it was $3kg/cm^2$ at 15-20cm of soil depth after 12 years and it used after being creation of hard pan layer after 23 years. 5. Change of the clay minerals by the different year after accomplishment of tidal reclamation did not show. The major clay minerals were illite and kaolinite, and accessory clay minerals were montmorillonite and vermiculite in both Munpo and Pori series.

  • PDF