Production of Bacterial Proteins from Cellulosic Materials

Abstract

An aerobic mesophilic Pseudomonas sp. isolated from activated sludge degraded different cellulosic materials to varying‐degrees. The degradability was mostly influenced by the lignin content and the crystalline nature of the substrate. Filter paper and cotton fibres, containing little lignin, were degraded maximally. Lignin‐rich Pinus and Larix needles were digested to a lesser extent. There was a difference between natural substrates and substrates that had undergone industrial treatment. At maximal protein production, the isolate converted 11–40% (w/w) of cellulosic substrates into proteins. Alkali treatment of the substrates had only little effect. Cellulose contained in pig‐waste was also degraded by the isolate. At first there was a period of protein production, but after long incubation, the efficiency of conversion of cellulose to protein decreased.

Fermentative conversion of swine and poultry wastes into nitrogen-enriched feedstuffs for ruminants

“…The results showed that -95% of the whey lactose w2s metabolized within 8 h in both mixed fermentations ( Fermentation times are considerably shorter than those previously described for animal waste fermentations (Ramasamy et al, 1979;Weiner and Rhodes, 1974;Weiner, 1977a). …”

External Microflora of a Marine Wood-Boring Isopod

“…Experiments are in progress to determine whether such a recycling via the external microflora occurs. Other bacteria that were common in the isopod and wood microfloras include Vibrio, Pseudomonas, and Acinetobacter species (Table 3), and these have been shown to hydrolyze cellulose (1,8,19,27,28,44,49). In addition to their cellulolytic capabilities, some Vibrio strains are known to hydrolyze chitin, the main component of isopod and other crustacean exoskeletons (11,49).…”

Production of single‐cell protein with cellulomonas sp. on hempstalk wastes

“…Bacteria have a faster growth and a higher rate of proteins than fungi. Most of the recent papers published concerned strains of the genera Cellulomonas [l-31, Pseudomow [4] or complex undefined mixed cultures [5] but the genus Cellulomonas is generally considered as the best cellulolwytic one [6]. Bacteria of this genus can degrade microcrystalline cellulose [7] as well as fungi, but also hemicelluloses [8] with high yields of protein, over than 55% [9] of the dry weight.…”