In multiple indicator models, there are several indicators for one trait–method unit. In the less restrictive model, there is one factor for all indicators belonging to the same trait–method unit. The correlations between these factors constitute a latent MTMM matrix. The correlation coefficients of this latent MTMM matrix are not distorted by measurement error and allow a more appropriate appl...

Methylene blue is the most extensively used chemical indicator of anaerobiosis. Its use as such an indicator was reported early in the literature (Smith, Wilder Quarter Century Book, p. 187, 1893). Techniques such as hanging strips of methylene blue-impregnated gauze inside an anaerobic jar were described by van Reimsdijk (Ned. Tijdschr. Geneesk. 66:1423, 1922). Present-day microbiologists ofte...