. Plant physiology. Plant physiology. 42 PHYSIOLOGY OF NUTRITION Beer-wort is the best nutrient medium for the culture of yeast. ^ Other liquids are used, however, among which may be mentioned Pasteur's solution as given above, grape juice, the juice of various other fruits and berries, and other materials containing sugar. Hansen has carried out very exhaustive studies upon yeasts and has established, among others, the following important species.^ Saccharomyces cerevisice I. Hansen. An EngUsh top-fermentation yeast, which produces, in beer-wort at room temperature, from 4 to 6 per cent, of a
. Plant physiology. Plant physiology. 42 PHYSIOLOGY OF NUTRITION Beer-wort is the best nutrient medium for the culture of yeast. ^ Other liquids are used, however, among which may be mentioned Pasteur's solution as given above, grape juice, the juice of various other fruits and berries, and other materials containing sugar. Hansen has carried out very exhaustive studies upon yeasts and has established, among others, the following important species.^ Saccharomyces cerevisice I. Hansen. An EngUsh top-fermentation yeast, which produces, in beer-wort at room temperature, from 4 to 6 per cent, of alcohol. In the resting condition the plant consists of single cells, which begin to multiply by budding when placed in beer-wort. The young generation con- sists of large spherical or oval cells (Fig. 21). After the termination of the primary fermentation a scum appears on the surface of the fermenting liquid and on this a continuous membrane of yeast-cells is formed. The general appearance of these cells is different from that of the sedimentary forms; much- elongated cells are found here (Fig. 22). In the surface membrane of old cul- tures occur very much elongated cells that are entirely unlike the young sedi- ment cells from which they have developed (Fig. 23). This film formation. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Palladin, Vladimir Ivanovich, 1859-1922; Livingston, Burton Edward, 1875-; Hopping, Aleita, 1890-. Philadelphia, P. Blakiston's Son & Co
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