The origin of some of the streptococci found in milk / by L.A. Rogers and Arnold O. Dahlberg.

  • Lore Alford Rogers
Date:
1914
Catalogue details

Licence: Public Domain Mark

Credit: The origin of some of the streptococci found in milk / by L.A. Rogers and Arnold O. Dahlberg. Source: Wellcome Collection.

    16/28 page 504
    THE FERMENTATION OF TEST SUBSTANCES In Table V the cultures are arranged on the basis of fermentation or nonfermentation of eight test substances. In this table all reactions of I per cent or over are counted as positive and those falling below as negative. The results given in this table are arranged in a form more easily studied in figures 5 and 6. In these diagrams all positive results are plotted to the left of a vertical line and the negative results to the right. The udder organisms are characterized by the general lack of ability to ferment the test substances. They fail almost without excep- tion to ferment raffinose and the polysaccharids, but show some tend- ency to attack the two alcohols. On the other hand, the 114 cultures Wc. 6.—Graphic representation of the characters of cultures of streptococci from the mouths of cows and ; from infected udders. from bovine feces fail almost entirely to utilize the alcohols, but show exceptional activity in fermenting the more complex sugars and the polysaccharids. TABLE V.—Fermentation of test substances. Dex- | ‘Saccha- Lactose. | Raffinose.| Starch. | Inulin. | Mannite. | Glycerin. trose. rose. Origin of cul- 2 Sey (eened. Wed ie sh | (EE SP eer A De ee 8 gl ot ture. Fi ae | Voll il gs — pt | eae hus) en Mae mA ecole Sil beable aS ata << +l sLotalis ct 42|}0| 2r | ar 42 |0 2 | 40 Pes y 2 | 40 29 ¥3- 134 8 Percentage of total....} 100 | o 50 5° Ioo | 0 4-8] 95.2] 2-3] 97-7! 4-8] 95-2] 69.0] 31.0] 80.9] 19.5 “Lota yc. 5r|o]} 40 | x 48 |3 o | 51 2 | 49 2 | 49 14 37 6 | 45 Percentage of total....| 100 |} 0} 78.4} 21-6] 94.3| 5.7| © |100 4 | 96 4 | 96 27.4| 72-6) 11.6) 884 ‘eces: Totals sical ZEA (O32 2 |114 |o | 93 | 21 | 60 | 54 | 20 | 94 2I 93 2 |r12 Percentage of total....] 100 | 0 | 98.2] 1.8} 100 | 0 | 81.5] 185] 52.5] 47-5] 17-6) 82.4] 18.5] 81.5) 1.8] 982 Mouth: Totals. cs. can 4o}o| 35 4 39 |o | 17 | 22 3 | 36 | 10 | 29 34 5 r | 38 Percentage of total....| 100 | 0 | 8.47] rx-3| 100 | o | 43.6] 56.4] 7. 7| 92.3] 25-6] 74-4] 87.2} 12.8] 2.6] 97.4
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