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  • Eh  (1)
  • Key words Chemoreception  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Boundary-layer effect on chemical signal movement near the antennae of the sphinx moth, Manduca sexta : temporal filters for olfaction (1998)
    Springer
    Journal of comparative physiology 182 (1998), S. 287-298 
    Details
    ISSN: 1432-1351
    Keywords: Key words Chemoreception ; Filters ; Fluid flow ; Manduca sexta ; Olfaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract For olfaction to occur, signal molecules must move through the environment from the source to the receptor cells. As molecules approach receptor structures they pass through a boundary layer surrounding those receptor structures. Within boundary layers the interaction between the forces causing chemical dispersion changes. To investigate how the boundary layer changes the dynamics of the chemical signals, we measured chemical dynamics within the boundary layer around the moth antennae using microelectrodes. The results showed that the boundary layer amplified three aspects of the chemical signal: peak height, peak onset, and decay time. Spectral analysis of turbulent signals showed that the temporal aspects of the chemical signal were altered. The boundary layers around the male and female antennae have different effects on the spectrum of chemical temporal fluctuations. Specifically, at a flow speed of 0.12 m s−1, the analysis showed distinct amplification patterns for each sex. Thus, the fluid flow around the antennae functions as a filter, altering the structure of the chemical signal that is arriving at the receptors. The results illustrated in this study show that male and female moths have different physical filters that can alter the information that can be extracted from odor plumes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050179
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of controlled redox conditions on metal solubility in acid sulfate soils (1991)
    Springer
    Plant and soil 133 (1991), S. 281-290 
    Details
    ISSN: 1573-5036
    Keywords: Eh ; flooded soils ; geochemistry ; iron reduction ; pyrite ; redox potential ; rice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Rice (Oryza sativa L.) yields are constrained by Fe and Al toxicity and P deficiency on acid sulfate soils. In order to delineate the effects of pH and redox potential on metal availability in these soils, one or both of these parameters must be held constant. The objective of this study was to investigate metal behavior in acid sulfate soils in redox controlled suspensions. Three acid sulfate soils, Rangsit Very Acid (Rsa), Rangsit (Rs), and Mahaphot (Ma); a potential acid sulfate soil, Bang Pakong (Bg); and a non-acid marine soil, Bangkok (Bk) from Thailand were utilized. After pre-incubating the soils under anaerobic conditions, the soils were oxidized in 100 mV increments in a stepwise fashion (oxidation cycle). Afterwards, the oxidized soils were reduced in the same manner (reduction cycle). The pH's of all the soils decreased during the oxidation cycle and increased upon re-reduction. Water-soluble Fe decreased in all the soils (except Bg) as the Eh was increased in the oxidation cycle, whereas Fe increased in the reduction cycle when the Eh was decreased until -50 mV, at which time Fe sulfide precipitation was believed to occur. In the Bg soil, pyrite oxidation (which evidently started at +50 mV) brought about large increases in soluble Fe under oxidizing conditions, and soil pH decreased to 2.0. The influence of the redox status on Mn varied. Soluble Al increased with increases in Eh (due to decreases in pH) and vice versa in most of the soils. Water-soluble P decreased under oxidizing conditions and increased under reducing conditions. Ammonium acetate-extractable Fe and P were highly correlated (r=0.88), indicating that Fe plays an important role in P availability in acid sulfate soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00009200
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    Paper (German National Licenses)
    Fulltext
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