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  • 1995-1999  (3)
  • Dithiocarbamate fungicides  (1)
  • Malpighian tubules  (1)
  • Manila Bay  (1)
  • 1
    ISSN: 1573-2932
    Keywords: Philippines ; Manila Bay ; coastal resources ; coastal zone management ; sea level rise ; AVVA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This study considers the Manila Bay coastal area of the Philippines for evaluation of possible consequences of accelerated sea level rise in the context of climate change, and suggests adaptive responses to such threats. The semi-enclosed Manila Bay is bounded by the provinces of Bataan, Pampanga, Bulacan, and Cavite, and some of the towns and cities of Metro Manila along the eastern side. This region is important to the commercial, industrial, agricultural, and aquacultural activities of the Philippines, with Manila as the seat of the national government and the rest among the political constituents of the National Capital Region. An increasing trend in the mean sea level has been observed since 1965 and continues today. The bay area is already subject to several hazards including floods and storm surges during tropical cyclones. The shoreline has changed greatly in the last 5 to 10 years due to reclamation for housing, ports, coastal roads, buildings, and other urbanized developments, adding to the threat of inundation. Selection of appropriate responses is looked at in terms of expected vulnerability, costs, land use, and other sociopolitical and legal considerations. Partial results show that parts of Cavite and Metro Manila Bay areas are especially vulnerable to accelerated sea level rise.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The journal of membrane biology 148 (1995), S. 233-242 
    ISSN: 1432-1424
    Keywords: Paracellular flow ; Malpighian tubules ; Secretion ; Epithelial transport ; Water transport ; Convective flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Lumen to bath J 12/C 1 and bath to lumen J 21/ C 2 fluxes per unit concentration of 19 probes with diameters (d m) ranging from 3.0–30.0 Å (water, urea, erythritol, mannitol, sucrose, raffinose and 13 dextrans with d m 9.1–30.0 Å) were measured during volume secretion (J v ) in the upper segment of the Malpighian Tubule of Rhodnius by perfusing lumen and bath with 14C or 3H-labeled probes. J net=(J 12/C 1 − J 21/C 2) was studied as a function of J v · J v was varied by using different concentrations of 5-hydroxy tryptamine. J net for 3H-water was not different from J v We found: (i) A strong correlation between J net and J v for 8 probes d m =3.0–11.8 Å (group a probes), indicating that the convective component of J net is more important than its diffusive component and than unstirred layers effects which are negligible. Therefore group a probes are solvent dragged as they cross the epithelium, (ii) There is no correlation between J net and J v for 11 probes with d m=11.8–30 Å (group b). Therefore these probes must cross the epithelium by diffusion and not by solvent drag, (iii) In a plot of J net/J v vs. d m group a probes show a steep linear relation with a slope = −0.111, while for group b probes the slope is −0.002. Thus there is a break between groups a and b in this plot. We tried to fit the data with models for restricted diffusion and convention through cylindrical or parallel slit pathways. We conclude that (i) group a probes are dragged by water through an 11.0 Å-wide slit, (ii) Most of J v must follow an extracellular noncytosolic pathway, (iii) Group b probes must diffuse through a 42 Å-wide slit, (iv) A cylindrical pathway does not fit the data.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Micellar vs. reversed phase separation ; Thiram in river water ; Dithiocarbamate fungicides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary After a comparative study of conventional reversed phase and micellar liquid chromatography a method is described for the determination of the fungicide thiram in river water based on the use of micelles of CTAB. The method involves the extraction/concentration of thiram with a C18 cartridge followed by separation on a C18 reversed-phase column with a mobile phase of 20% (v/v) acetonitrile/0.01 M CTAB in phosphate buffer (pH-6.3), and detection at 254 nm. The method allows the determination of thiram in the presence of other water-soluble dithiocarbamate fungicides (nabam, ziram and ferbam) with a limit of detection of 36 pg mL−1 for a typical 20-fold preconcentration.
    Type of Medium: Electronic Resource
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