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- W1501827738 abstract "A procedure for measuring total purine content of mixed ruminal bacteria was adapted for use in the determination of purines in pure cultures of ruminal bacteria. Recovery of adenine and guanine, alone or in mixture, was quite variable. The problem was traced to solubility of the silver salt of adenine in the acid wash solution. When the precipitating solution was used as the wash, recovery of the purines was over 97%. Recovery of a 1:1 mixture of adenine and guanine added to yeast RNA was 100.6+/-3.2%. Purine, protein, and bacterial concentrations were determined for 10 pure cultures of ruminal bacteria: Butyrivibrio fibrisolvens, D16f, H10b, and H17c; Fibrobacter succinogenes B21a; Lachnospira multiparus D25e; Lactobacillus lactis ARD26e; Prevotella ruminicola H15a; Ruminococcus albus 7; Ruminococcus flavefaciens B34b; and Streptococcus bovis ARD5d. The CV for the most-probable-number (MPN) assay (bacterial concentrations), purine analysis, and protein analysis were 55.86, 5.25 and 6.52%, respectively. Considerable variation was found among bacterial species and strains when purine and protein concentrations were compared as the amount per individual cell. More consistent values were obtained when these components were expressed on a dry matter basis. Purine:protein ratios for the 10 pure cultures ranged from .023 to .1299, with a mean value of .0883. For samples of mixed bacteria separated from ruminal fluid, this ratio was found to average .0306, which is approximately one-third of the value for the pure cultures. The value determined for the mixed bacterial sample is similar to previously reported values. Based on the ratio obtained with the pure cultures, the microbial protein flow out of the rumen has probably been overestimated in most previous reports. Limited studies suggest that the samples of mixed ruminal bacteria used as a standard are probably contaminated with feed particles containing protein, which results in lower purine:protein ratios." @default.
- W1501827738 created "2016-06-24" @default.
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- W1501827738 date "1999-01-01" @default.
- W1501827738 modified "2023-09-27" @default.
- W1501827738 title "Feasibility of using total purines as a marker for ruminal bacteria." @default.
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- W1501827738 doi "https://doi.org/10.2527/1999.77113084x" @default.
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