Aftereffect

Health and Safety Factors. Zinc oxide is considered nontoxic, but inhalation of freshly formed fume can cause zinc chills also known as brass-founder s ague. The symptoms are fever and cough followed by chills after ca 4—8 h (43). No aftereffects have been noted and workers who are... 

Historically, polychloriaated biphenyls (PCBs) and to a lesser extent polychlorinated terphenyls (PCTs) were the most important derivatives of the respective polyphenyls. When they came to be recognized as serious environmental contaminants, production ceased in the early 1970s. These products are now of significance primarily because of thek environmental aftereffects (62). Much environmental research and governmental regulations stem therefrom... 

However, MM A polymerization photoinitiated by Re2 (CO)io (A = 365 nm) shows a long-lived aftereffect, persisting for several hours at 25°C after irradiation has... 

Reaction lOe is relatively slow in the Re2(CO)io initiating system, and the thermal reaction between Re(CO)6 formed in 10a and CCI4 generated CCI3 radicals thermally in the dark and so is responsible for the aftereffect. However, Mn2(CO)io reacts rapidly according to lOe and no aftereffect is observed for the Mn2(CO)io/CCl4 photoinitiating system,... 

Bamford and coworkers [19] have shown that a prolonged aftereffect can be obtained with Mn-carbonyl in the presence of certain additives, notably cyclohexane and acetylacetone (S), It was suggested that the photochemical reaction between Mn2(CO)io and (S) produces the active species (Z), which generates free radicals by interaction with halide and Z probably formed from Mn (CO)6 species ... 

Zaleplon, a miscellaneous sedative, is the first prescription sleep preparation that the patient can take, later in the night, if you have at least 4 hours in bed before you become active again. With zaleplon the patient will fall asleep quickly and wake up with little or no aftereffects of the drug. 

Diarrhetic shellfish poisoning is an illness caused by polyether toxins produced by dinoflagellates and accumulated in shellfish (31). Patients suffer from diarrhea, nausea, and stomach pain but recover within three days without serious aftereffects. Despite the relatively mild symptoms, careful attention should be paid to the... 

After use, herbicides decompose slowly, and so affect cultivated plants for many years. In 1990, investigations in many regions of the USSR detected herbicides phytotoxic effects, especially among the si/m-triazine class, on different cultivars in many varied situations [13]. These sym-triazine herbicides, such as protrazin, simazin, atrazine, metazin, and prometrin, were used in different oblasts of the Ukraine, Kirgizia, Kazakhstan, Russia and Moldavia in previous years, especially on corn. Residual herbicide aftereffects led to the suppression and death of crops such as winter wheat, oats, barley, rye, potatoes, beets and sugar beets, linen, onions, watermelons and other melons, and sunflowers. 

If we will consider arbitrary random process, then for this process the conditional probability density W xn,tn x, t, ... x i,f i) depends on x1 X2,..., x . This leads to definite temporal connexity of the process, to existence of strong aftereffect, and, finally, to more precise reflection of peculiarities of real smooth processes. However, mathematical analysis of such processes becomes significantly sophisticated, up to complete impossibility of their deep and detailed analysis. Because of this reason, some tradeoff models of random processes are of interest, which are simple in analysis and at the same time correctly and satisfactory describe real processes. Such processes, having wide dissemination and recognition, are Markov processes. Markov process is a mathematical idealization. It utilizes the assumption that noise affecting the system is white (i.e., has constant spectrum for all frequencies). Real processes may be substituted by a Markov process when the spectrum of real noise is much wider than all characteristic frequencies of the system. 

Markov processes are processes without aftereffect. Thus, the -dimensional probability density of Markov process may be written as... 

Exposure to extremely high concentrations of toluene (5000-30,OOOppm) may cause mental confusion, loss of coordination, and unconsciouness within a few minutes. Controlled exposure of human subjects to 2 00 ppm for 8 hours produced mild fatigue, weakness, confusion, lacrimation, and paresthesias of the skin. At 600 ppm for 8 hours other effects included euphoria, headache, dizziness, dilated pupils, and nausea. At 800 ppm for 8 hours, symptoms were more pronounced and aftereffects included nervousness, muscular fatigue, and insomnia persisting for several days. " ... 

In indigenous plant communities, allelopathy may determine the distribution patterns of plants in relation to their neighbors, whereas in agriculture and forestry allelopathy may affect yields. For example, weeds with allelopathic potential or crops that produce autotoxic aftereffects may reduce yields Conversely, using crops with the allelopathic potential to decimate weeds may improve yields. 

Disturbance of the reaction mixture might result in the precipitation of a less crystalline material. The crystals should be separated out from the reaction mixture not later than 3 days, to avoid the coprecipitation of amorphous materials as aftereffect. 

Fatalities due to acute BZD overdose alone are extremely rare. Nevertheless, fatal overdoses with triazolam in the elderly have been reported ( 192, 193). Even with ingestion of massive doses, recovery appears to be rapid and without serious complications or aftereffects ( 194, 195, 196 and 197). Combined ingestion of BZDs with other CNS depressants (alcohol, barbiturates, narcotics, orTCAs), however, may result in severe CNS and respiratory depression or hypotension. Severity of symptoms appears to depend more on the type and quantity of the other drugs than on the BZD plasma level (194, 195, 196 and 197). 

It follows that irradiating any substance (including a polymer) will lead to the formation of ions and free radicals, and these are responsible for most of the observed chemical changes. If the irradiated substance is a solid, these reactive intermediates often remain trapped for a considerable time after irradiation and cause further chemical transformations, the so-called aftereffects. ... 

Flashbacks are an extremely disturbing aftereffect of use. LSD was first synthesized in 1943 by Albert Hoffman and was tested at one time by the Armed Forces as a possible incapacitating psychic agent. Its unpredictability and aftereffects made it of dubious worth. 

The above-mentioned agents, while unpleasant in even minute concn and extremely distressing in larger doses, generally leave no lasting aftereffects. Soon after removal from the contaminated atm, recovery from the effects of CS is prompt and complete. But as little as 1 mg of CS per cubic meter of air will irritate the eye. This is less than one-thousandth and perhaps as little as one ten-thousandth of the threshold value for chlorine or S dioxide (Ref 3)... 

Concentration, ppm Time of Exposure, hrs Probable Response Probable Aftereffects... 

The first phase, typically identified in the literature by the use of the adjective "psychotomimetic," was characterized by dominance of a priori, structured models. Seriously underestimating the effects that such preconceptions might have on the content and aftereffects of the subjective experience, researchers variously reported that psychedelics mimicked mental illness (when given in a setting that provoked it), illuminated Freudian theory (when administered by a com-... 

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