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  • Korea  (7)
  • permeability  (7)
  • Arabidopsis thaliana  (5)
  • Springer  (19)
  • American Geophysical Union (AGU)
  • 11
    Electronic Resource
    Electronic Resource
    Bdelloid rotifers from Korea (2000)
    Springer
    Hydrobiologia 439 (2000), S. 91-101 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; Bdelloidea ; Korea ; taxonomy ; biogeography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Twenty-five samples from 18 terrestrial and/or freshwater habitats in the eastern part of Korea yielded 38 new records of bdelloid rotifers, 22 of which are new to the Asian fauna. Among these Korean new records, Dissotrocha aculeata reversa Berzins and Habrotrocha plana Milne were recorded outside their type localities for the first time, and Macrotrachela bullata (Murray) was reported only from two countries after its description. Bradyscela granulosa de Koning, Habrotrocha gracilis gracilis Montet, Macrotrachela latior Donner, Philodina duplicalcar (de Koning) and P. rugosa coriacea Bryce are recorded outside Europe for the first time. The taxonomy and distribution of these rare species are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004181414535
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  • 12
    Electronic Resource
    Electronic Resource
    An Arabidopsis thaliana protein homologous to cyanobacterial high-light-inducible proteins (2000)
    Springer
    Plant molecular biology 42 (2000), S. 345-351 
    Details
    ISSN: 1573-5028
    Keywords: Arabidopsis thaliana ; ELIP ; EST ; high light ; HLIP ; LHC protein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An Arabidopsis thaliana cDNA clone encoding a novel 110 amino acid thylakoid protein has been sequenced. The in vitro synthesized protein is taken up by intact chloroplasts, inserted into the thylakoid membrane and the transit peptide is cleaved off during this process. The mature protein is predicted to contain 69 amino acids, to form one membrane-spanning α-helix and to have its N-terminus at the stromal side of the thylakoid membrane. The protein showed similarity to the LHC, ELIP and PsbS proteins of higher plants, but more pronounced to the high-light-inducible proteins (HLIPs) of cyanobacteria and red algae, to which no homologue previously has been detected in higher plants. As for HLIP and ELIP, high light increases the mRNA levels of the corresponding gene. Sequence comparisons indicate that the protein may bind chlorophyll and form dimers in the thylakoid membrane. The level of expression of the protein seems to be far lower than that of normal PSI and PSII subunits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006365213954
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  • 13
    Electronic Resource
    Electronic Resource
    Studies on the mechanisms of active ion fluxes across alveolar epithelial cell monolayers (1992)
    Springer
    Methods in cell science 14 (1992), S. 187-193 
    Details
    ISSN: 1573-0603
    Keywords: transport ; epithelium ; edema ; beta-agonist ; barrier ; permeability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary To investigate the cell physiologic and biological properties of the alveolar epithelium, we studied rat alveolar epithelial cell monolayers grown on permeable supports in primary culture. Type II alveolar epithelial cells were disaggregated using elastase, and partially purified on a discontinuous metrizamide gradient. These isolated cells were plated onto tissue culture-treated Nuclepore membrane filters at 1.5×106 cells/cm2 and maintained in a humidified incubator (5% CO2 in air, 37° C). After 2 days in culture, the bathing media on both sides of the cell monolayers were changed to fresh culture medium, thus removing nonadherent cells (mostly leukocytes). These monolayers exhibit a high transmonolayer resistance (〉2000 Ω-cm2) and actively transport ions. Radionuclide flux studies indicate that Na+ is the predominant ionic species absorbed actively under baseline conditions, accounting for about 80% of the total active ion transport. Cl− seems to be passively transported across the epithelium. However, when the epithelium is exposed to a beta-agonist (terbutaline), active absorption of Na+ is increased and active absorption of Cl− occurs. Although it is clear that both active Na+ and Cl− transport are dependent on Na+/K+-ATPase activity, and that Na+ enters cells predominantly through channels, the specific mechanisms by which Cl− enters and exits the alveolar epithelial cells remain unclear. The stimulated reabsorption of Na+ and Cl− may be important in helping to remove excess fluid from alveolar air spaces in the lung.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01409010
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  • 14
    Electronic Resource
    Electronic Resource
    Effective Thermal Conductivity and Permeability of Aluminum Foam Materials1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 453-464 
    Details
    ISSN: 1572-9567
    Keywords: aluminum foam metal ; effective thermal conductivity ; friction factor ; permeability ; pressure loss
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An experimental measurement program was performed to determine thermophysical properties of aluminum-based foam metals. The effective thermal conductivity k e and permeability K were investigated in detail. Experimental facilities were fabricated, and the measurement procedures and methodologies were evaluated. One-dimensional heat conduction was considered to determine k e . The results indicate that k e increases as the porosity ε decreases. However, no noticeable changes in k e were detected from variations of the cell size of the foam metal at a fixed porosity ε. The permeability K is substantially affected by both ε and the cell size. An empirical correlation for the friction factor f is proposed based on the concepts of K and inertial effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006643815323
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  • 15
    Electronic Resource
    Electronic Resource
    Molecular cloning of a novel fimbrin-like cDNA from Arabidopsis thaliana (1998)
    Springer
    Plant molecular biology 36 (1998), S. 23-31 
    Details
    ISSN: 1573-5028
    Keywords: actin-binding protein ; Arabidopsis thaliana ; cytoskeleton ; fimbrin-like ; molecular cloning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fimbrin is a 68–70 kDa actin-bundling protein in animal cells and lower eukaryotes that participates in diverse morphogenetic processes by cross-linking actin filaments into bundles. Here we report the cloning by degenerate polymerase chain reaction (PCR) of ATFIM1, a 2.3 kb cDNA from Arabidopsis thaliana that codes for a novel 76 kDa fimbrin-like polypeptide (AtFim1). The predicted sequence of AtFim1 shares ca. 40% identity with non-plant fimbrins and contains two tandem repeats, each possessing a 27 amino acid region identified as a putative actin-binding domain in fimbrins and in a larger family of actin cross-linking proteins. Preceding the tandem repeats at the amino terminus of AtFim1 is a single-EF-hand-like domain with moderate homology to calmodulin-like calcium-binding proteins. AtFim1 differs from non-plant fimbrins, however, in that it contains an extended carboxy-terminal tail of ca. 65 amino acids. ATFIM1 is encoded by a single gene, although sequencing of two partial fimbrin-like expressed sequence tag (EST) clones indicates that Arabidopsis contains at least two fimbrin-like proteins. Northern blot analysis and reverse-transcription PCR (RT-PCR) demonstrated that ATFIM1 is expressed in all major organs examined (roots, leaves, stems, flowers and siliques). This is the first report of the cloning of a full length plant gene that encodes a putative actin filament-bundling protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005884112192
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  • 16
    Electronic Resource
    Electronic Resource
    The concentrations of lead in urban and nonurban atmospheres of Won Ju city, Korea (1997)
    Springer
    Water, air & soil pollution 98 (1997), S. 255-273 
    Details
    ISSN: 1573-2932
    Keywords: atmosphere ; Korea ; lead ; Pb/Fe ratio ; urban/nonurban
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The geographical and temporal distribution patterns of atmospheric lead (Pb) were investigated using the data acquired from four sampling locations in Won Ju City, Kang Won Do, Korea (February 1991 to August 1995). The monthly atmospheric Pb concentrations of four study sites were found in the range of 0.0005–0.250 (site #1: grassland, N=47), 0.013–0.405 (site #2: residential, N=53), 0.004–0.420 (site #3: commercial, N=50), and 0.004-1.881 µg m−3 (site #4: industrial, N=52). From all four sampling stations, maximum concentrations of Pb commonly occurred during winter, whilst minimum concentrations were typically observed during summer. Although seasonal differences in meteorological conditions are important to explain such temporal distribution trends, the increase in Pb levels during the spring season, especially during the month of April appears to reflect the influence of soil dust evasion from China. While Pb distributions were strongly affected by seasonality, examination of inter-annual variation trends revealed that the Pb levels had been gradually decreasing over the study periods and that such phenomenon was ubiquitous throughout all the study sites. The annual decrease rates of Pb, computed from the regression analysis, spanned from -0.014 (grassland) to -0.055 µg m−3 yr−1 (industrial). The existence of strong geographical variabilities was also confirmed by the development of a concentration gradient across the four sampling sites on the order: industrial (0.326±0.307, N=52) ≫ commercial (0.157±0.104, N=50) 〉 residential (0.149±0.102, N=53) 〉 grassland (0.088±0.060, N=47). A series of statistical analysis on the data sets in concert with computation of Pb/Fe elemental ratios indicate that the industrial sources may not directly be influencing the Pb levels of the other studied sites. Albeit changes in its long-term distribution trends, the data collected from this study confirm that atmospheric Pb may be classified as a group of constituents whose distribution is rather predictable spatiotemporally due both to: (1) strong repetitiveness of seasonal distribution trends and (2) relative spatial homogeneities that are associated with its unique physicochemical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02047038
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  • 17
    Electronic Resource
    Electronic Resource
    THE CONCENTRATIONS OF LEAD IN URBAN AND NONURBAN ATMOSPHERES OF WON JU CITY, KOREA (1997)
    Springer
    Water, air & soil pollution 98 (1997), S. 255-273 
    Details
    ISSN: 1573-2932
    Keywords: atmosphere ; Korea ; lead ; Pb/Fe ratio ; urban/nonurban
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The geographical and temporal distribution patterns of atmospheric lead (Pb) were investigated using the data acquired from four sampling locations in Won Ju City, Kang Won Do, Korea (February 1991 to August 1995). The monthly atmospheric Pb concentrations of four study sites were found in the range of 0.005-0.250 (site #1: grassland, N=47), 0.013–0.405 (site #2: residential, N=53), 0.004–0.420 (site #3: commercial, N=50), and 0.004-1.881 µg m-3 (site #4: industrial, N=52). From all four sampling stations, maximum concentrations of Pb commonly occurred during winter, whilst minimum concentrations were typically observed during summer. Although seasonal differences in meteorological conditions are important to explain such temporal distribution trends, the increase in Pb levels during the spring season, especially during the month of April appears to reflect the influence of soil dust evasion from China. While Pb distributions were strongly affected by seasonality, examination of inter-annual variation trends revealed that the Pb levels had been gradually decreasing over the study periods and that such phenomenon was ubiquitous throughout all the study sites. The annual decrease rates of Pb, computed from the regression analysis, spanned from –0.014 (grassland) to –0.055 µg m-3 yr-1 (industrial). The existence of strong geographical variabilities was also confirmed by the development of a concentration gradient across the four sampling sites on the order: industrial (0.326±0.307, N=52) ≫ commercial (0.157±0.104, N=50) 〉 residential (0.149±0.102, N=53) 〉 grassland (0.088±0.060, N=47). A series of statistical analysis on the data sets in concert with computation of Pb/Fe elemental ratios indicate that the industrial sources may not directly be influencing the Pb levels of the other studied sites. Albeit changes in its long-term distribution trends, the data collected from this study confirm that atmospheric Pb may be classified as a group of constituents whose distribution is rather predictable spatiotemporally due both to: (1) strong repetitiveness of seasonal distribution trends and (2) relative spatial homogeneities that are associated with its unique physicochemical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026459527714
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  • 18
    Electronic Resource
    Electronic Resource
    Prevalence of congenital malformations and genetic diseases in Korea (1999)
    Springer
    Journal of human genetics 44 (1999), S. 30-34 
    Details
    ISSN: 1435-232X
    Keywords: Key words Congenital malformations ; Genetic diseases ; Prevalence ; Infant ; Korea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A nationwide investigation of congenital malformations and genetic diseases in Korea was conducted by analyzing Medical Insurance data for infants aged under 1 year. Medical Insurance data were obtained for 1993 and 1994 and the ICD-9 (International Classification of Diseases, Ninth Revision) code was used to classify the diseases. The coverage rate of medical insurance was approximately 95% of the total population. Anomalies of the cardiovascular, musculoskeletal, and gastrointestinal systems, in descending order of frequency, were more frequent than anomalies in other systems. The average prevalence of cardiovascular anomalies for 1993 and 1994 was 15 per 1000 infants, and ventricular septal defect, with an average prevalence of about 3.50 per 1000 for 1993 and 1994, was the most frequent cardiovascular anomaly in infants. Polydactyly was the most frequent musculoskeletal anomaly, with an average prevalence, for 1993 and 1994, of about 1.20 per 1000 infants. Anencephaly had the highest frequency of nervous system anomalies. Congenital hypertrophic pyloric stenosis was the most common of the gastrointestinal anomalies. The prevalence of the congenital malformations and genetic diseases examined was similar to that reported in other countries. Total medical expenses for the care of patients with each disease entity were also estimated. The highest medical expenses were incurred for ventricular septal defect, congenital coagulation factor VIII disorders, atrial septal defect, tetralogy of Fallot, and spinal anomalies, in descending order of magnitude. This investigation could be helpful in planning social welfare systems, as well as for elucidating the current status of congenital malformations and genetic diseases in Korea, and in other Asian countries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100380050102
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  • 19
    Electronic Resource
    Electronic Resource
    Transport of Thyrotropin Releasing Hormone in Rabbit Buccal Mucosa in Vitro (1992)
    Springer
    Pharmaceutical research 9 (1992), S. 1113-1122 
    Details
    ISSN: 1573-904X
    Keywords: thyrotropin releasing hormone ; buccal mucosa ; metabolism ; permeability ; in vitro tissue integrity ; transport pathways ; rate-limiting barrier
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The transport of thyrotropin releasing hormone (TRH) in rabbit buccal mucosa in vitro has been investigated with respect to (a) rate and type of metabolism of TRH on mucosal and serosal sides of buccal mucosa, (b) mechanism of TRH transport including charge effect on its permeability, and (c) pathway and rate-limiting regions of TRH movement. In addition, the integrity of excised buccal mucosa has been evaluated for purposes of in vitro solute diffusion experiments using tissue ATP level data, transmission electron microscopy, and TRH transport kinetic data. The results indicate that excised rabbit buccal mucosa can be used for TRH diffusion studies for approximately 6 hr. In addition, TRH apparently traverses buccal mucosa by simple diffusion with a steady-state permeability of about 10−7 cm/sec, and this permeability is independent of pH. Moreover, the primary pathway appears to be via the intercellular space in the rate-limiting barrier, i.e., the upper 50 µm of the epithelium. Finally, TRH is degraded predominantly by deamidase activity, which is followed by, to a lesser degree, carboxypeptidase metabolism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1015883217858
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