• Title/Summary/Keyword: titration method

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Effect of Acid Treatments on Hydrogen Storage Behaviors of Ordered Mesoporous Carbons (화학적 산처리가 중기공 탄소체의 수소저장거동에 미치는 영향)

  • Lee, Seul-Yi;Park, Soo-Jin
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.229.1-229.1
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    • 2010
  • We investigated the effect of chemical acid treatments on hydrogen storage behaviors of the ordered mesoporous carbons (MCs). The surface functional groups and specific elements of the MCs were characterized with Fourier Transform Infrared (FT-IR) spectrometry and X-ray photoelectron spectroscopy (XPS). Also, the changes in the surface functional groups of the MCs were quantitatively detected by Boehm's titration method. The structural properties of the MCs were investigated using X-ray diffraction (XRD). The hydrogen adsorption capacity of the MCs was evaluated by means of adsorption isotherms at 77 K/1 bar. The formation of surface functional groups by the acidic treatments could influence on the hydrogen storage capacity of the MCs.

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Synthesis of Chiral Azophenolic Pyridino-18-Crown-6 Ether and Its Enantiomeric Recognition toward Chiral Primary Amines

  • Kim, Jae-kon;Song, Su-Hee;Kim, Jae-Hong;Kim, Tae-Hyun;Kim, Ha-suck;Suh, Hong-Suk
    • Bulletin of the Korean Chemical Society
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    • v.27 no.10
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    • pp.1577-1580
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    • 2006
  • The article reports the synthesis and enantiomeric recognition of a new chiral azophenolic pyridino-18-crown-6 ether, (S,S)-6, possessing diphenyl groups as chiral barriers. The association constants for the enantiomeric recognition of chiral primary amines (7-12) using chiral azophenolic pyridino-18-crown-6 ether, (S,S)-6, were determined by UV-visible titration method in acetonitrile at $25{^{\circ}C}$.

Immunological Identification ofFferrobacillus ferrooxidans and Thiobacillus thiooxidans (Ferrobaillus ferrooxidans와 Tthiobacillus thiooxdans의 면역학적 동정연구)

  • 이강순;장정순;이강석
    • Korean Journal of Microbiology
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    • v.13 no.3
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    • pp.91-100
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    • 1975
  • The chemolithoautotrophic bacteria, Freeobacillus ferroxidans and Thiobacillus thiooxidans were identified according to their immunological and serological properties. The antibody to these organisms was easily elicited in experimental animals, however, the overall serologicl reactivities were low according to different kinds of titration methods. By means of the quantitive and qualitative analysis such as hemagglutination or ouchterlony tests, F.ferroxidans and T. thiooxidans were different in their immunoreactivities, whereas the strains among the F.ferrooxidans were possessed, in some extent, the sharing antigenic determinants. In the results of the polyacrylamide gel electrophoresis/radioimmunometric method, the major antigenic determinants of the organisms illustrated the type specificitles in the fraction number of 20-30 in their gel electrophoretograms with some modifications of the antigenic moieties.

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Survival of Cryptosporidium muris (strain MCR) oocysts under cryopreservation (쥐와포자충(MCR주)의 냉동 보존)

  • 이재구;박배근
    • Parasites, Hosts and Diseases
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    • v.34 no.2
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    • pp.155-157
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    • 1996
  • We have successfully maintained Cyptospori, diam mons by cryopreservation. Oocysts were suspended in distilled water, stored at $-20^{\circ}C$ for 24 hrs, and then cryopreserved at $-70^{\circ}C$. Cryopreserved specimens were slowly thawed at $5^{\circ}C$. Oocysts, which had been cryopreserved for 1% months without cryoprotective agents. retained their infectivity by the mouse titration method. Oocysts stored at $5^{\circ}C$ in 2.5% potassium dichromate failed to retain their infectivity beyond 6.5 months.

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Honeycomb Monolith Coated with Mo(VI)/ZrO2 as a Versatile Catalyst System for Liquid Phase Transesterification

  • Thimmaraju, N.;Pratap, S.R.;Senthilkumar, M.;Mohamed Shamshuddin, S.Z.
    • Journal of the Korean Chemical Society
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    • v.56 no.5
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    • pp.563-570
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    • 2012
  • Solid acid Mo(VI)/$ZrO_2$ with 2-10% Mo(VI) was coated on honeycomb monoliths by impregnation method. These catalytic materials were characterized by BET, $NH_3$-TPD/n-butylamine back titration, PXRD and SEM techniques. Phenyl salicylate (Salol) was synthesized via transesterification of methyl salicylate and phenol over these catalytic materials. An excellent yield (91.0%) of salol was obtained under specific reaction conditions. The effect of poisoning of acid sites of the catalytic material by adsorbing different bases and its effect on total surface acidity, powder XRD phases and catalytic activity was studied. A triangular correlation between the surface acidity, powder XRD phases and catalytic activity of Mo(VI)/$ZrO_2$ was observed. The thermally regenerated catalytic material was reused repeatedly with a consistent high yield of salol.

Mercury Adsorption Behaviors of Copper/Activated Carbons by Electroless Plating

  • Bae, Kyong-Min;Kim, Byung-Joo;Park, Soo-Jin
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.304-304
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    • 2009
  • In this study, the adsorption behaviors of mercury ions on the electroless Cu-plated activated carbons have been investigated. The amount of copper on activated carbons have been confirmed by atomic absorption spectrophotometer (AAS). The surface properties of the ACs studied have been characterized by using Boehm's titration method and scanning electron microscopy (SEM).Experimental results showed the adsorption capacity of mercury ions was increased as the electroless Cu plating. This was probably due to the introduction of copper on ACs leaded to an increase in the surface basicity.

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Variation of Alternative and Cytochrome Respiration during Ripening in Rice Leaves

  • Lee, Kwang-hong
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.47 no.4
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    • pp.301-304
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    • 2002
  • The variation of alternative and cytochrome respiration during ripening in rice leaves (Oryza sativa L. cv. Takanari) was examined. The capacity of both respiration pathway was measured by inhibitor titration method using gas-phase oxygen electrodes. The alternative respiration rate decreased from 31.3% of the total respiration rate at around heading to 11.7% at 34 days after heading in the first fully expanded leaf from the top, and further to 6.4 % at 34 days after heading in the fourth leaf from the top. In contrast, the proportion of cytochrome respiration to total respiration increased with leaf senescence. The possible cause of alternative respiration as either an increase in inefficient respiration or a decrease in growth efficiency during ripening was discussed.

Development of NaOH Concentration Control System for a Liquor-Flow Polyester Hydrolysis Machine (액류감량기 가성소다 농도 제어 시스템의 개발)

  • 박정우;변희운;노근필;구자길;황백순;김덕리
    • Textile Coloration and Finishing
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    • v.12 no.4
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    • pp.233-238
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    • 2000
  • In this study, the control system of sodium hydroxide was demonstrated to systemize hydrolysis process in polyester dyeing. We mainly focused on the application method of acid-alkali titration for the polyester hydrolysis machine of liquor-flow type. Industrial pH meter with electrode type was used for identifying equivalence point. Three units which were analogue-to-digital card, microprocessor and digital output card were used to control NaOH concentration in the control part of the system. The yielded data are translated to the microprocessor through analogue-digital interfacing card. After calculating, NaOH concentration in NaOH storage tank was controlled through the digital output card and solenoid valves.

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2-Aminothiazolinium Based Tripodal Receptors:Synthesis and Recognition of Oxoanions

  • Nguyen, Quynh Pham Bao;Le, Thanh Nguyen;Kim, Taek-Hyeon
    • Bulletin of the Korean Chemical Society
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    • v.30 no.8
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    • pp.1743-1748
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    • 2009
  • Novel 2-aminothiazolinium based tripodal receptors were designed and synthesized. The binding property of these receptors toward various anions was investigated by the isothermal titration calorimetry (ITC) method. Receptor 4 recognized the acetate anion with 1:1 stoichiometry, whereas it bound the other oxoanions such as sulfate and phosphate in complex modes. By modifying the phenyl groups at the 4-position of the thiazoline rings of the tripodal receptor 4 to induce a mutual aromatic stacking interaction among the three ligands, receptor 10 showed totally different binding behavior, which gave rise to the 1:1 binding mode for the sulfate anion. This result was confirmed by ESI MS spectrometry.

Drug-biomacromolecule interaction 1

  • Kim, Chong-Kook;Ahn, Hae-Young
    • Archives of Pharmacal Research
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    • v.4 no.2
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    • pp.99-107
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    • 1981
  • To investigate the protein binding characteristics of ibuprofenlysine, the effects of drub conentration, pH, ionic strength and protein concentration on the binding of drug to protein concentration on the binding of drug to protein were studied by fluorescence probe method. The conformational change of protein was investigated by circular dichroism (CD) measurement. As the concentration of drug increases, the association constant decreases. These may be due to complex formation of the probe and drug, or the interaction of the protein-probe complex and drug. The association constant for ibuprofenlysine increased with increasing protein concentration. These finding suggest a sharing of one ibuprofenlysine molecule by more than one protein molecule in the binding. The binding between ibuprofenlysine and protein was dependent on pH and ionic strength. It seems that both hydrophobic binding and some electrostatic forces are involved in the binding of ibuprofenlysing to protein.

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