The hydrogen reacts with lactic acid to form propionic acid. Pyruvic acid has been isolated from the fermentation of glucose (1934) and of lactic acid (unpublished data) by Wood and Werkman. These investigators supported Van Niel's proposed dissimilation of pyruvic acid inasmuch as the occurrence of acetaldehyde could not be demonstrated. Little information is available concerning the aerobic d...

The chemical profiles of vaginal fluid collected from cows in oestrus and nonoestrus were analysed by gas chromatography-mass spectrometry (GC-MS) to establish any qualitative differences that might have potential value in bovine biocommunication. Eight different organic compounds were detected using the two chromatograms. The chemical profiles of oestrus vaginal fluid were distinguished signif...

ABSTRACT This study was designed to determine the effect of a combination propionic-acetic acid on body weight, relative weight some organs, lactic bacteria, and intestinal pH neonatal broilers. A total 60 1-day-old Ross 308® broiler chickens were randomly placed in metabolic cages two treatments, three replicates, ten birds per replicates. The treatments consisted control diet (CD) CD + 0.03% ...

In 1942 Smith (1) demonstrated that the silica gel partition chromatogram, first developed by Martin and Synge (2), would separate a mixture of formic, acetic, propionic, n-butyric, and n-valeric acids in chloroform-l per cent butanol into its component acids. In 1945 Ramsey and Patterson (3) confirmed this work and presented a partition chromatographic method for the qualitative separation and...

Oleaginous yeasts have attracted increasing scientific interest as single cell oil (SCO) producers. SCO can be used a fossil-free fuel substitute, but also source of rarely found odd-chain fatty acids (OCFAs), such C15, C17, and C25 which wide range nutritional biological applications. Volatile (VFAs) gained sustainable carbon for yeasts. This study aims to improve current knowledge on yeast sp...

An in vitro study was conducted using a 4 • 2 • 2 factorial design with RAC (readily available carbohydrate) levels of 30, 40, 50 and 60%, tallow levels of 0 and 3%, and urea levels of 0 and 2%. Acetic and propionic acid production and ammonia disappearance increased as the level of RAC increased from 30 to 50%. Tallow reduced acetic acid production and increased the amount of propionic acid pr...

Transcription of the Azospirillum brasilense ipdC gene, encoding an indole-3-pyruvate decarboxylase involved in the biosynthesis of indole-3-acetic acid (IAA), is induced by IAA as determined by ipdC-gusA expression studies and Northern analysis. Besides IAA, exogenously added synthetic auxins such as 1-naphthaleneacetic acid, 2,4-dichlorophenoxypropionic acid, and p-chlorophenoxyacetic acid we...

The influence of pH on the growth parameters of and the organic acids produced by Clostridium sporogenes 3121 cultured in test tubes and fermentors at 35 degrees C was examined. Specific growth rates in the fermentor maintained at a constant pH ranged from 0.20 h-1 at pH 5.00 to 0.86 h-1 at pH 6.50. Acetic acid was the primary organic acid in supernatants of 24-h cultures; total organic acid le...

This experiment investigated the effect of intraruminal infusion of propionic acid on ruminal VFA metabolism and the absorption of nutrients by the mesenteric- and portal-drained viscera of seven Friesian steers, average BW 127 kg, fed a dried grass-pellet diet. Each received by random allocation 0 (control), .5, or 1.0 mol of propionic acid/d for 7 d. Ruminal acetate and propionate irreversibl...