accelerated autocondensation of quebracho tannin wood adhesive by boric acid

Environmentally Friendly Wood Preservative System Based on Polymerized Tannin Resin-boric Acid for Outdoor Applications♣

Boron compounds are used as wood preservatives as they are both fungicide and insecticide, relatively inexpensive and environmentally acceptable. Nevertheless, in the field of wood protection, borates are only used for indoor non-exposed applications or in association with other biocides, due to their main disadvantage of being readily leachable from treated wood. To overcome this problem, bori...

Polyethylene glycol influences selection of foraging location by sheep consuming quebracho tannin.

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...

Ollgoglyceric Acid Synthesis by Autocondensation of Glyceroyl Tbloester

Research Note Sheep Ingestion of Water Containing Quebracho or Black Wattle Tannin

Ingestion of small amounts of condensed tannin (CT) by ruminants can produce valuable outcomes such as improved nitrogen use and reduced bloating, methane output, and gastrointestinal parasitism. However, many grasses and forbs contain little if any CT. The specific types of CT vary in plants and can have somewhat different effects on ruminants. Individual ruminants can respond differently to C...

Effect of Quebracho Tannin Drenching on Heligmosomoides Bakeri Infection in Mice

In order to combat the increasing problems of anthelmintic resistance, alternative methods of control of gastrointestinal (GI) nematode infections are being sought. Thirty 8-9 weeks old outbred albino mice were placed in 5 groups of six mice each. Mice in four groups were infected with 150 Heligmosomoides bakeri infective larvae (L3) per mouse while one was reserved as the uninfected control. T...

Adhesive Bonding of Wood Materials

Adhesion to Wood 9–1 Surface Properties of Wood Adherends 9–2 Extractives on Surfaces 9–3 Knifeand Abrasive-Planed Surfaces 9–3 Veneer Surfaces 9–4 Surfaces of Wood and Nonwood Composite Products 9–5 Physical Properties of Wood Adherends 9–6 Density and Porosity 9–6 Moisture Content and Dimensional Changes 9–7 Adhesives 9–9 Composition 9–9 Health and Safety 9–10 Strength and Durability 9–10 Adh...