Without after-effect

Phosphine is a very toxic gas. Inhalation of phosphine causes restlessness, followed by tremors, fatigue, slight drowsiness, nausea, vomiting, and, frequently severe gastric pain and diarrhea. Although most cases recover without after-effects, in some cases, coma or convulsions may precede death. 

Some who have taken gammahydroxybutyrate without knowing what it was have subsequently awakened in hospital having been deeply comatose for a few hours, without after-effects (4). 

SAFETY PROFILE A poison by inhalation. A very toxic gas whose effects are not completely understood. The chief effects are central nervous system depression and lung irritation. There may be pulmonary edema, dilation of the heart, and hyperemia of the visceral organs. Inhalation can cause coma and convulsions leading to death within 48 hours. However, most cases recover without after-effects. Chronic poisoning, characterized by anemia, bronchitis, gastrointestinal disturbances, and visual, speech, and motor disturbances, may result from continued exposure to very low concentrations. 

A Markovian description can be naturally introduced by generalising deterministic systems modelled by ordinary differential equations. In other words, the stochastic version of a deterministic process without after-effect is a Markov process. 

A stochastic process is a collection of random variables teJ, Two important cases are the discrete parameter process, when J cz = 0, 1, 2,. .. and the continuous parameter process, when T ci IR We shall mostly consider the second case, and, in addition, restrict ourselves to Markov processes (processes without after-effect). 

Inhalation should be avoided. A group of six rats that were exposed to 64,000 ppm of methyl vinyl ether in air for 4 h were anesthetized. AH recovered and appeared normal after 72 h. One died after 96 h. The others survived the 2-week observation period without noticeable effect. 

Because pulp bleaching agents are, for the most part, reactive oxidising agents, appropriate precautions must be taken in their handling and use. For example, it is important to ensure that the threshold limit values (TLV) (20) in Table 2 are not exceeded in the workplace air. These are airborne concentrations in either parts per million by volume under standard ambient conditions or mg per cubic meter of air. They "represent conditions under which it is beUeved that nearly all workers may be repeatedly exposed, day after day, without adverse effect" (20). TWA refers to a time-weighted average for an 8-h workday STEL is a short-term exposure limit or maximum allowable concentration to which workers can be continuously exposed for 15 minutes. 

Incapacitants are most suitable for consideration in limited warfare situations, eg, when enemy troops are intermingled with a friendly population, or in a city that is a key military objective. The purpose is to capture the enemy without killing the civiUans. Incapacitating agents should produce no permanent after-effects and allow for complete recovery. 

TLV-TWA is the time-weighted average concentration hmit for a normal 8-h day and 40-h worlweek, to which nearly all workers may be repeatedly exposed, day after day, without adverse effect (developed by the ACGIH). 

The TLVs, as recommended and published by the ACGIH, refer to concentrations of airborne contaminants or levels of physical agents, and represent the conditions to which it is believed nearly all workers may be repeatedly exposed day after day without adverse effects. TLVs are based on the results of animal experiments, limited human experiments, some industrial experience and, when possible, a combination of all three. 

Time-weighted average (TWA) TLV - the time-weighted average concentration for a normal 8 hr work day and a 40 hr work week, to which it is believed that nearly all workers may be repeatedly exposed, day after day, without untoward effects. TWA TLVs permit excursions above the TLV provided that they are compensated for by equivalent excursions below the TLV during the work day. The excursion above the TLV is a rule of thumb, as explained in the source reference. 

These types of antidepressant were introduced around 10 years after the SSRIs. They include the serotonin noradrenaline reuptake inhibitor venlafaxine and the selective noradrenaline reuptake inhibitor reboxetine. Although there are fewer data about these drugs, clinical experience has shown they are well tolerated and, unlike the SSRIs, they are only weak inhibitors of drug metabolism (Kent, 2000). Depression is a common psychiatric disorder seen in the elderly and often remains untreated or inadequately treated (Forsell and Fastbom, 2000). Venlafaxine was shown to improve the mood in a group of 36 older patients without any effect on cognitive function, an important consideration where there is the possibility of the coexistence of mild or undiagnosed dementia (Tsolaki et al., 2000). 

Symptoms Symptoms appear about ten to twenty days after the Q fever rickettsia are inhaled. The symptoms resemble flu symptoms and include fever, chills, headache, fatigue and muscle aches. About one half of persons with symptoms will have pneumonia evident on chest X-ray and some of these will have a cough or chest pain. The complications of meningitis or and inflammation of the heart may arise, but these are uncommon. Normally, the duration of Q fever is two days to two weeks at which time the disease resolves without permanent effects on the individual. 

TLV Threshold Limit Value. An estimate of the average safe airborne concentration of a substance conditions under which it is believed that nearly all workers may be repeatedly exposed day after day without adverse effect. 

PGDN has effects on the cardiovascular and central nervous systems. Exposure of healthy, primarily male subjects to PGDN at a concentration of 0.03 ppm for 8 h was without adverse effects. A mild headache was present in one of three subjects after exposure at 0.1 ppm for 6 h. Adverse effects became more severe at higher concentrations and shorter exposure durations 0.2 ppm for 8 h produced severe headache in six of 12 exposures 0.35 ppm for 8 h produced severe headache in two of three subjects and disturbance of... 

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