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Orla-Jensen's Classification of Lactic Acid Bacteria

Woodworth, Wisconsin

ABSTRACT

A valuable contribution to our knowledge of lactic acid bacteria has been recently published by S. Orla-Jensen in "Mémoires de 1' Académie Royale des Sciences et des Lettres de Danemark, Copenhague" (Section des Sciences, 8me. série, t.V, no. 2). This study has covered a period of ten years duration and the results of cultural and biochemical reactions have been so correlated as to form the basis for classification.

A brief summary of our knowledge of lactic acid bacteria is necessary here in order to lead logically to the system proposed by Orla-Jensen. The term "lactic acid bacteria" has not been used by all authors in the same sense. While Kruse and other authors recognize as true lactic acid bacteria only those bacteria which are intimately concerned with the so-called normal souring of milk, others, notably Löhnis, include all those bacteria which produce lactic acid in milk and which are of consequence in the dairy.