Department of Soil Sciences, UFZ Centre for Environmental Research Leipzig-Halle, Theodor-Lieser-Str. 4-9, D-06120 Halle, Germany. Fax: +49 (345) 5585449. E-mail: [email protected] * Author for correspondence and reprint requests Z. Naturforsch. 56c, 767-780 (2001); received April 20/May 23, 2001 Pinus sylvestris L., Sulfur Dioxide, Antioxidants Field investigations with Scots pine trees (Pinu...

The Eocene Huber Formation, exposed in the CFI Hall mine south of Irwinton, in Wilkinson County, Georgia, displays colored zones that are a consequence of an oxidative weathering front. These zones vary from very light gray (gray) to pinkish white (pink) to very pale yellow (cream) (Munsell N8, 5YR 8/2 and 2.5Y 8/2, respectively) with increasing degree of oxidation. A representative sample from...

We investigated the sulfuric acid resistance of low-calcium alkali-activated materials (i.e., geopolymers) supplemented with an iron mineral admixture hematite). Geopolymers without and 5% hematite were produced at two alkali contents (Na:Al = 0.86 1.39). Acid degradation reactions comprehensibly studied through three replenishes acid. Results demonstrate that is chemically active upon exposure...

abstract fruit cracking of pomegranate is a phenomenon that is shown at most growing zones of the world. pomegranate cracking is the main obstacle for production and export, and have a lot of annual economic damage, the present study has been done about pomegranate trees. the purpose of this research is surveying the decreasing of pomegranate cracking and increasing the fruit quantities and qua...

Traces of ferric oxide have a strong catalytic effect on both nucleation and growth phases of the transfornation of TiOz from anatase to rutile. This effect is greatly enhanced in atmospheres of low/6,. Using X-ray diffraction techniques, the kinetics of the phase transformation were studied at 1 atm. and 900 to 1000'Q for anatase mixed intimately with up to 0.2/s by weight hematite (Feroa) tn ...

Hematite (α-Fe(2)O(3)) constitutes one of the most promising semiconductor materials for the conversion of sunlight into chemical fuels by water splitting. Its inherent drawbacks related to the long penetration depth of light and poor charge carrier conductivity are being progressively overcome by employing nanostructuring strategies and improved catalysts. However, the physical-chemical mechan...

The most frequent crystallographic preferred orientations developed during the progressive phase transformation of magnetite-hematite-goethite are described and analyzed in two natural samples banded iron formations from Carajás Mineral Province. Microtextures martitized grains containing three phases microplaty matrix were a scanning electron microscope equipped with detector for backscatter d...

Three Latin-square trials were conducted to determine the effects of feeding the thyroid depressant propylthiouracil (PTU) on plasma concentrations of thyroxine (T4) and triiodothyronine (T3) in feedlot steers. In trial 1, four steers were fed 0, 1, 2 or 4 mg PTU/kg body weight daily during five 35-d experimental periods. In trial 2, eight steers were fed 0, .5, 1 or 2 mg PTU/kg body weight dai...