Non Absorption of Finely Emulsified Paraffinum Liquidum in the Intestine of the Rat.

.On injection into rat duodenum of emulsions of paraffinum liquidum tenue, prepared a. m. FRAZEE, AND with an average globular diameter of 0.3–0.5 μ, no absorption was found over a period of 6 hours. It has thus been impossible to confirm this important support of the “Partition Hypothesis”.     

An Electrolytical Method for the Determination of Cations.

The method is based on the solubility in mercury of the amalgams of the cations formed by electrolysis. The amalgams are extracted by rocking movements (Widmark ) AND titrated. The extraction velocity for some cations is determined. Sodium (100 per cent) and potassium (98–99 per cent) are recovered after one hours rocking. After the same time 90 per cent of calcium are extracted, some of the calcium amalgam being precipitated on the glass wall. Ammonium and guanidine are also extracted, but only slowly, magnesium and ferric ion can not be extracted. Direct determinations can be made on serum and erythrocytes, it is important that the proteins are precipitated during the electrolysis. There is good agreement with the values found after ashing of serum; direct determination on the erythrocytes give a somewhat higher value than after ashing. The analyses are carried out with 0.05 ml. serum. The applicability of the method is discussed.     

Effect of cold conditions on manual performance while wearing petroleum industry protective clothing

The purpose of this study was to investigate manual performance and thermal responses during low work intensity in persons wearing standard protective clothing in the petroleum industry when they were exposed to a range of temperatures (5, -5, -15 and -25℃) that are relevant to environmental conditions for petroleum industry personnel in northern regions. Twelve men participated in the study. Protective clothing was adjusted for the given cold exposure according to current practices. The subjects performed manual tests five times under each environmental condition. The manual performance test battery consisted of four different tests: tactile sensation (Semmes-Weinstein monofilaments), finger dexterity (Purdue Pegboard), hand dexterity (Complete Minnesota dexterity test) and grip strength (grip dynamometer). We found that exposure to -5℃ or colder lowered skin and body temperatures and reduced manual performance during low work intensity. In conclusion the current protective clothing at a given cold exposure is not adequate to maintain manual performance and thermal balance for petroleum workers in the high north.