Results 161 to 170 of about 3,289 (205)

Structure and Properties of Rigid Foams Derived From Quebracho Tannin

Materials & Design, 2014
International audienceThe first highly porous organic rigid foams based on condensed tannin extracted from quebracho tree (Schinopsis sp.) are reported. Samples having different densities have been prepared and characterised.
Vanessa Fierro, Antonio Pizzi, Alain Celzard   +2 more
exaly   +3 more sources

Quebracho Tannin Bio-Based Adhesives for Plywood

Polymers, 2022
Wood-based products are traditionally bonded with synthetic adhesives. Resources availability and ecological concerns have drawn attention to bio-based sources. The use of tannin-based adhesives for engineered wood products has been known for decades, however, these formulations were hardly used for the gluing of solid wood because their rigidity ...
Michela Zanetti, Marius-Catalin Barbu, Gianluca Tondi   +2 more
exaly   +3 more sources

Biosorption of Pb(II) Ions by Modified Quebracho Tannin Resin

Journal of Hazardous Materials, 2009
In this study, the effect of temperature, pH and initial metal concentration on Pb(II) biosorption on modified quebracho tannin resin (QTR) was investigated. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to investigate QTR structure and morphology.
Meral Yurtsever
exaly   +5 more sources

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Intake and performance of growing lambs supplemented with quebracho tannins

Tropical Animal Health and Production, 2022
Tannins can modulate rumen fermentation and increase the bypass protein; however, the use of different doses and sources of condensed tannins (CT) in animal diets has divergent results. The aim of this study was to evaluate the effect of different levels of dietary quebracho extract inclusion, as a CT source, in the performance and carcass ...
Sthefany Kamile, Dos Santos, Jesséa, de Fátima França Biz, Jordana Andrioli, Salgado, Renata Ernlund Freitas, de Macedo, Cristina Santos, Sotomaior   +4 more
openaire   +2 more sources

The Quebracho Region of Argentina

Geographical Review, 1924
The quebracho forests of northern Argentina and southern Paraguay have the distinction of being the only forests of their kind in existence. Here and here only, between the 20th and 3ist parallels, quebracho is found in sufficient quantities to permit commercial exploitation.
openaire   +1 more source

Purified tannins from quebracho colorado

Phytochemistry, 1994
Abstract The acetone-water solubles from quebracho tannin extract were separated into three fractions of different molecular weights. The purified tannins yielded sugars and gallic acid upon acid hydrolysis, and lignin derived degradation products upon KMnO 4 oxidation.
W. Streit, D. Fengel
openaire   +1 more source

Production of Industrial Quebracho

Economic Geography, 1945
of the last century. Quebracho first made its appearance in Europe at the Paris Exposition in 1867, where its value was recognized and received wide attention; within a few years its use spread to tanneries of France, Switzerland, and Germany, although it was not until the late eighties and early nineties that large importation into Europe began ...
openaire   +1 more source

Arqueología, piel y quebracho

2017
La reflexión que da origen a este escrito tiene la particularidad de haber nacido desde dos lugares no habituales para comenzar una indagación en arqueología: el silencio y la piel. El silencio apareció en términos de ausencia. La ausencia -o mejor la mínima presencia- de árboles llamados Quebrachos en contextos arqueológicos del valle de Ambato ...
Marconetto, María Bernarda, Gardenal, Guillermo Martin, Barría, Patricio   +2 more
openaire   +1 more source

Quebracho.

The Hospital
Saeed Chehreh Chelgani, Ali Asimi Neisiani, Darius Wonyen, Amir Hossein Mohammad Zadeh, Roozbeh Saneie   +4 more
  +6 more sources

Quebracho

1927
G. Frerichs, G. Arends, H. Zörnig
openaire   +1 more source