Fluorescent method for evaluation of cholinesterase inhibitors.

The sensitivity of detection of anticholinesterase compounds (e.g. tacrine) by the biochemical method significantly increased when fluorogenic compound N-(4-(7-diethylamino-4-methylcoumarine-3-yl)phenyl)maleimide was used instead of Ellman's reagent.

Long-term variation in surface ozone and its precursors in Athens, Greece: a forecasting tool.

Intention, Goal, Scope, Background: Photochemical pollution is a very complex process involving meteorological, topographic, emission and chemical parameters. The most important chemical mechanisms involved in the atmospheric process have already been identified and studied. However, many unknown parameters still exist because of the large number of participating chemical reactions.

Global tropospheric ozone dynamics. Part I: Tropospheric ozone precursors.

An overview of the tropospheric ozone changes is presented focussing mainly on the tropospheric ozone precursors. The complexity of the problem is shown through the consideration of a great number of relevant substances, like nitrogen compounds, volatile organic compounds, peroxyacetyl nitrate, hydroxyl radical, carbon monoxide, alkyl nitrates. The up-to-date knowledge on the relevant numerical modelling is presented in Part II.

Global total ozone dynamics : Impact on surface solar ultraviolet radiation variability and ecosystems Part II: Dynamics of atmospheric chemical composition: The role of remote sensing Part I: Global ozone dynamics and environmental safety (ESPR 3/96, pp. 153-157).

A review has been made recently studying global total ozone changes (including stratospheric and troposphere components), as well as biologically active surface solar ultraviolet (UV-B) radiation variations on the basis of satellite and conventional surface observations (Kondratyev and Varotsos, Part I). In the aforementioned review, relevant impacts on terrestrial and aquatic ecosystems, as well as on biochemical cycles and man, have been discussed. Special attention has been paid to the analysis of observed and potential impacts of enhanced UV-B radiation on biogeochemical cycles and the chemical composition of the atmosphere.

Global total ozone dynamics : Impact on surface solar ultraviolet radiation variability and ecosystems Part I: Global ozone dynamics and environmental safety (ESPR 3/96) Part II: Dynamics of atmospheric chemical composition: The role of remote sensing (ESPR 4/96).

An overview of the ozone issues is given including the following aspects: 1. The impact of tropospheric ozone on climate as a greenhouse gas (GHG), 2. Solar activity effects on TO and ozone concentration vertical profiles in both the troposphere and stratosphere (in cases of solar radiation absorption by the stratosphere, an unexpected problem arises via a coupling between processes of increased absorption due to "bursts" of solar activity and an enhanced destruction of ozone molecules due to the same increase resulting in weakening UV radiation absorption) and 3.

Spectral Radiative Flux Divergence and Its Variability in the Troposphere in the 0.4-2.4-micro Region.

Within the program of the Complex Atmospheric Energetics Experiment (CAENEX-70) and with the help of an IL-18 aircraft flying laboratory, we have measured spectral (in the 0.4-2.4-microm interval) radiative fluxes, the energy balance, and flux divergence of energy in a free atmosphere (at 0.

Visual Observations and Spectral Investigations of the Earth's Atmosphere Twilight Aureole from the Soyuz-5 Spacecraft.

Results are given of the spectrophotometric measurements of the earth's atmosphere twilight aureole as first performed from the Soyuz-5 spacecraft. The analysis is made of the experimental findings depending on the wavelength, the perigee height of the sight ray above the earth's surface, the sunset angle, etc..