• Title/Summary/Keyword: sucrose flux

Search Result 20, Processing Time 0.029 seconds

Separation Performance of Disc Plate and Frame Type Reverse Osmosis System (원판틀형 역삼투 시스템의 투과성능)

  • 노상호;이종일;김영채;배성렬;정건용
    • Membrane Journal
    • /
    • v.10 no.3
    • /
    • pp.155-162
    • /
    • 2000
  • The reverse osmosis membrane housing(HY) was developed for excellent distribution of a feed solution, and the separation performance was compared with the commercialized Rochem(RC) system. The permeation flux of HY system was a little lower than that of RC system. On the other hand, the NaCl rejection ra4io was generally higher. Also, the permeation flux and rejection ratio for type A, B and C modules(disc plate and frame type) were measured using NaCl, sucrose and butanol solutions. The separation performance of type C module for NaCL and sucrose solutions was the most effective, and then those of type A and B were followed, respectively. However, the separation performance for butanol solution was type B, C and A order. The flux improvement ratio of type B to A increased as butanol concentration decreased or operating pressure increased up to 28 bar.

  • PDF

The Separation Performance of Disc Plate and Frame Type Reverse Osmosis Modules (원판틀형 역삼투 모듈의 투과성능 비교)

  • 박민수;배성렬;정건용
    • Membrane Journal
    • /
    • v.7 no.2
    • /
    • pp.75-83
    • /
    • 1997
  • The disc plate and frame type modules for reverse osmosis were developed using three different types of baffles: linear (Type 1), curved (Type 2) and parallel shapes (Type 3). Separation performance tests were carried out for the modules using NaCl and sucrose solutions under the various concentrations and operating pressures. The permeation flux and solute rejection ratio for Type 3 module were the highest within operating pressure (35bar) and flow rate (6 l/min). The flux improvement ratio of Type 2 or 3 to Type 1 for NaCl solution decreased as operating pressure increased: flux improvement ratios of Type 3 for 1wt% of NaCl solution were about 100 and 10% at 10 and 35bar, respectively. However, the flux improvement ratio for sucrose solutions varied with the operating pressure and concentration. The permeation flux for Type 3 depended on the flow rate linearly, which is higher than that of turbulent flow region in the smooth channel.

  • PDF

The Role of Rice Vacuolar Invertase2 in Seed Size Control

  • Lee, Dae-Woo;Lee, Sang-Kyu;Rahman, Md Mizanor;Kim, Yu-Jin;Zhang, Dabing;Jeon, Jong-Seong
    • Molecules and Cells
    • /
    • v.42 no.10
    • /
    • pp.711-720
    • /
    • 2019
  • Sink strength optimizes sucrose import, which is fundamental to support developing seed grains and increase crop yields, including those of rice (Oryza sativa). In this regard, little is known about the function of vacuolar invertase (VIN) in controlling sink strength and thereby seed size. Here, in rice we analyzed mutants of two VINs, OsVIN1 and OsVIN2, to examine their role during seed development. In a phenotypic analysis of the T-DNA insertion mutants, only the OsVIN2 mutant osvin2-1 exhibited reduced seed size and grain weight. Scanning electron microscopy analysis revealed that the small seed grains of osvin2-1 can be attributed to a reduction in spikelet size. A significant decrease in VIN activity and hexose level in the osvin2-1 spikelets interfered with spikelet growth. In addition, significant reduction in starch and increase in sucrose, which are characteristic features of reduced turnover and flux of sucrose due to impaired sink strength, were evident in the pre-storage stage of osvin2-1 developing grains. In situ hybridization analysis found that expression of OsVIN2 was predominant in the endocarp of developing grains. A genetically complemented line with a native genomic clone of OsVIN2 rescued reduced VIN activity and seed size. Two additional mutants, osvin2-2 and osvin2-3 generated by the CRISPR/Cas9 method, exhibited phenotypes similar to those of osvin2-1 in spikelet and seed size, VIN activity, and sugar metabolites. These results clearly demonstrate an important role of OsVIN2 as sink strength modulator that is critical for the maintenance of sucrose flux into developing seed grains.

Analysis of the Separation Using Disc Plate and Frame Type Reverse Osmosis Module (원판틀형 역삼투 모듈을 이용한 분리 특성 해석)

  • Chung, Kun-Yong;Chung, Wook;Won, Jang-Mook;Bae, Seong-Youl;Ha, Baik-Hyon
    • Membrane Journal
    • /
    • v.5 no.2
    • /
    • pp.81-88
    • /
    • 1995
  • Separation performance was measured for the disc plate and frame type reverse osmosis module using NaCl and sucrose solutions. An analysis of membrane performance was done following the equations proposed by Kimura-Sourirajan[8]. The membrane permeability was $2.17 \times 10^{-6}$(gmol/$cm^2$-sec-bar) and independent of operating pressure. The effect of concentration polarization for sucrose solution was higher than that of NaCl. Permeation flux for sucrose solution above 40 bar was decreased as operating pressure was increased. Solute rejection for NaCl solution was decreased, but that of sucrose was increased as operating pressure was increased.

  • PDF

Effects of Membrane Filter and Sucrose Concentrations on the Growth of Balloon Flower (Platycodon grandiflorum A. DC.) Plantlets In Vitro (Membrane Filter와 Sucrose 농도가 도라지(Platycodon grandiflorum A. DC.) 기내 배양묘의 생장에 미치는 영향)

  • Choi, So-Ra;Kim, Myung-Jun;Eun, Jong-Seon;Ahn, Min-Sil;Lim, Hoi-Chun;Ryu, Jeong;You, Dong-Hyun
    • Journal of Plant Biotechnology
    • /
    • v.31 no.3
    • /
    • pp.209-217
    • /
    • 2004
  • The shoots of balloon flower (Platycodon grandiflorum A. DC.) in vitro germinated from seeds were cultured on MS basal medium containing 0.1 mg/L NAA under the various sucrose concentrations and with/without membrane filter (MF) on the lid of vessel. The growth responses were checked to obtain healthy plantlets. The $CO_2$ and $C_2$H$_4$ concentration in vessel without MF were higher than those with MF. The $CO_2$ concentration without MF was increased as days in culture went by whereas the $C_2$H$_4$ concentration was decreased. The plant growth with MF and high sucrose concentration was good. Fresh and dry weight of plantlets cultured in sucrose 4.5% with MF were higher than those in no sucrose without MF. Also the content of chlorophyll of plantlets cultured with MF was high and the content of sugar was shown a similar results and a remarkable difference between MF treatments, especially. Stomata cultured with MF was closer than that without MF and mesophyll of leaf were more developed with MF or in high sucrose concentration. When the plantlets were transplanted in the pot at 25$\pm$2$^{\circ}C$, 75% relative humidity and low PPFD (photosynthetic photon flux density), the percentage of survival after 13 days without MF was 0% but it was 100% with MF regardless of sucrose concentrations.

Characteristics of Flux Decline in Forward Osmosis Process for Asymmetric Cellulose Membrane (정삼투 공정에 있어 비대칭 셀룰로오즈 막의 투과유속 감소특성)

  • Lee, Keun-Woo;Han, Myeong-Jin;Nam, Suk-Tae
    • Korean Chemical Engineering Research
    • /
    • v.52 no.3
    • /
    • pp.328-334
    • /
    • 2014
  • This study examined the effect of concentration polarization on permeate flux in forward osmosis (FO) membrane process for saline and sucrose solution. The reduction in permeate flux during the FO membrane process is largely due to the formation of concentration polarization on membrane surfaces. The flux reduction due to internal concentration polarization formed on the porous support layer was larger than that due to the external concentration polarization on the active membrane surface. Water permeate flux through the FO membrane increased nonlinearly with the increase in osmotic pressure. The water permeability coefficient was $1.8081{\times}10^{-7}m/s{\cdot}atm$ for draw solution on active layer (DS-AL) mode and $1.0957{\times}10^{-7}m/s{\cdot}atm$ for draw solution on support layer (DS-SL) mode in NaCl solution system. The corresponding membrane resistance was $5.5306{\times}10^6$ and $9.1266{\times}10^6s{\cdot}atm/m$, respectively. With respect to the sucrose solution, the permeate flux for DS-AL mode was 1.33~1.90 times higher than that for DS-SL mode. The corresponding variation in the permeation flux (J) due to osmotic pressure (${\pi}$) would be expressed as $J=-0.0177+0.4506{\pi}-0.0032{\pi}^2$ for the forward and $J=0.0948+0.3292{\pi}-0.0037{\pi}^2$ for the latter.

Effect of MS Medium Strength, Sucrose Concentration, and Light Condition on Bulblet Formation and Growth of Muscari armenicum In Vitro (MS 배지내 무기물 농도, 당 농도 및 광 조건이 무스카리의 기내 자구 형성과 비대에 미치는 영향)

  • Chung, Mi-Young;Kim, Chang-Kil;Chung, Jae-Dong
    • FLOWER RESEARCH JOURNAL
    • /
    • v.19 no.1
    • /
    • pp.49-54
    • /
    • 2011
  • The influences of MS medium strength, sucrose concentration, and light condition on bulblet formation and growth were studied in leaf tissue culture of Muscari armenicum 'Early Giant'. Bulblet formation from leaf segments were the most effective on MS medium supplemented with $0.01mg{\cdot}L^{-1}$ NAA, $0.2m{\cdot}L^{-1}$ kinetin, $30g{\cdot}L^{-1}$ sucrose, and $8g{\cdot}L^{-1}$ gelrite under darkness for 2 weeks followed by 16 hr photoperiod with a photosynthetic photon flux density of $50mol{\cdot}m^{-2}{\cdot}s^{-1}$. However the compactness of bulblets formed in vitro was promoted in the MS medium with $60gL^{-1}$ sucrose. Acclimatized plants flowered during the second year of the growing period without any phenotypic variations and formed average 1.5 bulblets per mother bulb.

Separation of Heavy Metal Ions across Novel Mosaic Membrane (하전모자이크 막을 사용하여 중금속이온의 분리)

  • Song, Myung-Kwan;Lee, Jang-Oo;Yang, Wong-Kang
    • Proceedings of the Membrane Society of Korea Conference
    • /
    • 2005.11a
    • /
    • pp.96-101
    • /
    • 2005
  • A theory for the material transports through ion exchange membrane has been developed on the basis of nonequilibrium thermodynamics by removing the assumption of solvent flow in the previous paper and applied to a detailed study of the ionic transport properties of new charged mosaic membrane(CMM) system. The CMM having two different fixed charges in the polymer membrane indicated unique selective transport behavior then ion-exchange membrane. The separation behavior of ion transport across the CMM with a parallel array of positive and negative functional charges were investigated. It was well-known the analysis of the volume flux and solute flux based on nonequilibrium thermodynamics. Our suggests preferential salt transport across the charged mosaic membranes. Transport properties of heavy metal ions, $Mg^{2+}$, $Mn^{2+}$and sucrose system across the charged mosaic membrane were estimated. As a result, we were known metal salts transport depended largely on the CMM. The reflection coefficient indicated the negative value that suggested preferential material transport and was independent of charged mosaic membrane thickness.

  • PDF

Transport Coefficients Across A Charged Mosaic Membrane III

  • Lee, Jungwoon;Minho Kang;Song, Myung-Kwan;Wongkang Yang;Lee, Jang-Woo
    • Korean Membrane Journal
    • /
    • v.5 no.1
    • /
    • pp.61-67
    • /
    • 2003
  • Various characteristics of ion transport properties of a charged mosaic membrane with a parallel array of positive and negative functional charges were investigated, From the analysis of the volume flux, it was found that the salt flux based on nonequilibrium thermodynamics, preferential salt transport across the charged mosaic membrane. Transport properties of the magnesium sulfate(MgSO$_4$) and sucrose across the charged mosaic membrane were estimated. As a result, metal salts transport depended largely on the charged states and molecular weight otherwise nonelectrolyte solution was rejected under all experimental conditions. On the other hand, the reflection coefficient s indicated the negative value that suggested preferential material transport and was independent of charged mosaic thickness.

Conditions for Ideal Draw Solutes and Current Research Trends in the Draw Solutes for Forward Osmosis Process (정삼투 공정 적용에 적합한 유도 용질의 조건과 최근 동향)

  • Jun, Byung-Moon;Han, Sang-Woo;Kim, Yu-Kyung;Nguyen, Thi Phuong Nga;Park, Hyung-Gyu;Kwon, Young-Nam
    • Membrane Journal
    • /
    • v.25 no.2
    • /
    • pp.132-143
    • /
    • 2015
  • Water is an essential resource for humans, but fresh water becomes scarce due to population growth and contamination of limited resources. Membrane technology has been widely used for water treatment, and forward osmosis is a process which does not need high hydraulic pressure for the operation. However, there are needs for (1) development of novel draw solutes causing low internal concentration polarization and reverse salt flux for high water flux, and (2) development of economic recovery method of the draw solutes in the diluted draw solution. Previous researches on the draw solute include $NaHCO_3$ which can be regenerated by about $60^{\circ}C$ heating, sucrose which can make potable water without additional process, and magnetic nanoparticles which can be regenerated by external magnetic field. Using the principles of forward osmosis process, sea water desalination, wastewater treatment, refinement of proteins, energy generation using pressure retarded osmosis process, preparation of diluted fertilizer, and growing algae for biofuel can be conducted. This paper summarizes characteristics of ideal draw solutes, recovery method of the draw solutes, and various application examples.