Abstract In the present study, tannins from stem and root barks of Tessmannia burttii Harms ( Caesalpiniaceae ), a plant species abundantly growing in Tanzania other parts Africa, were investigated for their suitability hides tanning. Tannin powder was extracted at selected temperatures (30, 50 80 °C) influence each temperature on crosslinking capacity evaluated. The interaction mechanism betwe...

We examined the relationship between giraffes (Giraffa camelopardalis) and Acacia nigrescens in Kruger National Park, South Africa, to determine whether these tall ungulates may be providing a pollination service for the trees, or are simply flower predators. We quantified florivory and subsequent fruit set in the presence and absence of giraffes.Acacia nigrescens flowers are clearly a substant...

The objectives of this research were to assess the bioavailability of calcium using equilibrium dialysis after simulated gastric digestion method in 20 commonly consumed green leafy vegetables (GLVs) from the typical Indian diet, provide data on the content of calcium absorption inhibitors, like oxalate, phytate, tannin and dietary fibres, and evaluate the inhibitory effect of these compounds o...

Tannins are a heterogeneous group of phenolic polymers that can induce detrimental effects when consumed by herbivores. Polyethylene glycol (PEG) binds to tannins and thus attenuates their negative effects. Our objective was to determine whether sheep actively seek PEG when fed tannins and thus modify their foraging location as a function of the spatial distribution of PEG. Lambs were first tra...

Velvetbean is a relatively cheap source of supplemental protein for ruminants fed low quality forages. However, there is little published information on the maturity stages at which the nutritive value of velvetbean is optimized. This study evaluated the chemical composition, tannin concentration and digestibility of velvetbean harvested at 77, 90, 110, and 123 DAP at the BRU. Dry matter, NDF, ...

A kinetic model of a fixed bed tubular reactor incorporating catalyst deactivation was developed for the ISOMAX unit of Arak refinery. The kinetic parameters for the hydrocracking reactions over the commercial catalyst were determined using initial activity plant data i.e. when the catalyst is fresh. Catalyst deactivation was then taken into account by means of deactivation function based on pl...

Condensed tannin (CT) or proanthocyanidin (PA) is a unique group of phenolic metabolite with high molecular weight with specific structure. It is reported that, the presence of high-CT in the legumes adversely affect the nutrients in the plant and impairs the digestibility upon consumption by animals. Winged bean (Psophocarpus tetragonolobus (L.) DC.) is one of the promising underutilized legum...