Exposure trails

Our walk and the exposure to so much sun and stone sent us as if by instinct toward the unbroken green wall of the jungle across the pastures behind the mission. Broad sandy trails led to the system of Witoto, Bora, and Muinane villages that are the "indigenous... 

Apply a pulse of eludng buffer (2.0 mL) by means of the sample loop at a reduced flow rate of 0.2 mL/min to prevent trailing of the eluted conjugate peak. Collect fracdons into tubes containing neutralizing buffer to minimize the exposure of the conjugate to the low pH eludon condi-dons (ieeNote 14). 

All maze procedures have limitations that must be considered when interpreting data obtained with these methods. One related particularly to their use with rodents is that subjects leave an odor trail in the maze that can influence the behavior of rodents subsequently tested in the maze. While the experimenter can clean the maze between subjects, it must also be noted that the rodent s sense of smell is much more sensitive than humans, making it difficult to be certain that indeed no odors are still present. Another potential problem is that these procedures obviously require interactions between the experimenter and the subject during the course of testing because the rat must be constantly retrieved from the arms and replaced in the start box. This raises the distinct possibility of both subject and experimenter bias, unless the experiment can be carried out by an individual with no knowledge of any treatment (e.g., exposure to drug or chemical) of any subjects. 

Kurz MD, Trail TW, Colodner D, Denton G (1988) Exposure-age dating with eosmogenie He. Chem Geol 70 39-39... 

Torgersen T, Drenkard S, State M, Schlosser P, Shapiro AM (1995) Mantle helium in ground waters of eastern North America time and space constraints on sources. Geology 23 675-678 Trail TW, Kurz MD, Jenkins WJ (1991) Diffusion of cosmogenic He in olivine and quartz Implications for surface exposure dating. Earth Planet Sci Lett 103 241-256 Turcotte DL, Schubert G. (1982) Geodynamics Applications of continuum physics to geological problems. Wiley, New York... 

Hilts SR, Pan UW, Wh ite ER and Yates CL (1995) Trail Lead Program Exposure Pathways Investigations. Pinal Report, Trail, British Columbia, Canada Trail Community Lead Task Porce. 

EXPLOSION and FIRE CONCERNS flammable liquid NFPA rating Health 2, Flammability 4, Reactivity 0 vapor is heavier than air, mixes well with air, and easily forms explosive mixtures flashback along vapor trail may occur very dangerous fire risk when exposed to heat or flame reacts vigorously with oxidants forms an explosive product when it reacts with methanol and sodium methoxide exposures to high concentrations have resulted in industrial fatalities combustion may produce irritants and toxic gases use water spray, alcohol-resistant foam, dry chemical, or carbon dioxide for firefighting purposes. 

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