The Hill reaction is one of the simplest chloroplast reactions in which one can measure in unambiguous terms both the reducing and the oxidizing equivalents produced in the process of photosyntnesis. In its simplest aspect, the oxidizing power is measured as oxygen production, while the reducing power is measured in terms of reduction of some electron acceptor (9). Two other photochemical react...

Partial pressures of carbon dioxide ( pCO2) were measured in river and coastal waters on two cruises in November 1999 and June 2000 on the Southwest Florida Shelf. Supersaturation with respect to the atmosphere was observed for most river and nearshore waters in November 1999. pCO2 ranged from 403 Aatm in the Gulf of Mexico to 1280 Aatm in the Shark River. The coastal waters of the Southwest Fl...

Products of photodecomposition of 2,4,6-trinitrotoluene (TNT) have been observed as a coating on TNT particles and as a fine powdered residue surrounding TNT particles on ranges receiving limited rainfall. The significance of photolysis of explosive formulations on training ranges is unknown. Therefore, photolysis of a common explosive formulation, Composition B, and its components in a soil ma...

The direct reaction kinetic method of low pressure fast discharge flow (DF) with resonance fluorescence monitoring of OH (RF) has been applied to determine rate coefficients for the overall reactions OH + C2H5F (EtF) (1) and OH + CH3C(O)F (AcF) (2). Acetyl fluoride reacts slowly with the hydroxyl radical, the rate coefficient at laboratory temperature is k2(300 K) = (0.74 ± 0.05) × 10(-14) cm(3...

Introduction Blue light is a part of the spectrum with the highest energy content, which can reach the retina. The damage that it can cause to the retina is called photochemical or blue-light retinal injury. For the retinal injury assessment of the photochemical and aphakic retinal hazards in the wavelength range of 300-700 nm, use of effective spectral radiance limits (W.m-2.sr-1) seems to be...