Barlow rule

BARLOW RULE. The volumes of space occupied by the various atoms in a given molecule are approximately proportional to the valences of the atoms whenever an element exhibits inure than one kind of valence the lowest value is generally selected. 

Barlow s rule (phys chem( The rule that the volume occupied by the atoms In a given molecule is proportional to the valences of the atoms, using the lowest valency values. bar,loz, rul ... 

Recent work (Lupinski et al., 1967 Hadek et al., 1971 Barlow et al., 1976) has shown that the maximum conductivity depends critically upon the precise composition of the complex salts and is essentially controlled by the neutral impurity molecules. Just as radical anion salts are based on strong electron acceptors such as TCNQ, radical cation salts based on strong electron donors such as TTF are also known. A listing of the more important radical ion salts is included in Table 3. As a rule these salts give rise to an intense esr signal with their spin concentrations reaching 1 to 1.5 spins per DA pair. 

Redundancy. In many behavioral contexts, signals sent simultaneously or consecutively in several sensory modalities achieve the same effect. As early as 1977, Barlow noted that multichannel redundancy is almost the rule . Priming cues in domestic sheep constitute an example of such multisensory signals. Chemicals from the ram, specifically hexadecanediol-1,2 and octa-decanediol-1,2 contained in the suint (wool fat), but also visual and tactile stimuli from the ram stimulate LH secretion and ovulation in ewes (Pearce and Oldham, 1988). 

D.A. Barlow, J.K. Baird and C.-H. Su, Theory of the von Weimam Rules Governing the Average Size of Crystals Precipitated from a Supersaturated Solution, Journal of Crystal Growth, 264 (2004), 417-423. 

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