General comments. This study presents a good overview of the CaCO3 polimorph precipitation in corals skeletal formation, investigating the ability of corals to switch from aragonite to calcite precipitation, especially in their early developmental stages in response to changing seawater chemistry. Mg/Ca ratio, temperature and pCO2 has been already recognized as the most important factor affecti...

Vacuum drying of Salicornia herbacea L. was performed at different drying temperatures (50, 60, 70, and 80°C) to evaluate the drying characteristics and the effect of drying temperatures on the quality of Salicornia. As the drying temperature increased, the drying time decreased significantly (P< 0.05). The drying rate decreased with decrease in moisture content and increase in drying time. On ...

Advances in characterization of the soil clay mineralogy using X-ray 1 diffraction: from decomposition to profile fitting 2 3 F. HUBERT, L. CANER, A. MEUNIER & B. LANSON 4 5 HydrASA, University of Poitiers, INSU-CNRS, 40 avenue du Recteur Pineau, F-86022 6 Poitiers cedex, France and Mineralogy & Environments Group, LGCA, Maison des 7 GéoSciences, Grenoble University, CNRS, F-38041 Grenoble Cede...

The use of spectroscopic techniques (especially phosphorus-31 nuclear magnetic resonance [(31)P-NMR] and X-ray absorption near edge structure spectroscopy) has recently advanced the analysis of the speciation of P in poultry litter (PL) and greatly enhanced our understanding of changes in P pools in PL that receive alum (aluminum sulfate) to reduce water-soluble P and control ammonia emissions ...

SUMMAaY. The Mineralogical Society celebrated its 5oth Anniversary in I926; this address attempts to summarize the substantial developments in the subject over the past 5o years and looks ahead to the future. Up to 1926, only the techniques of goniometry, optical investigation of non-opaques, and classical chemical analysis had been fully exploited. X-ray crystallography, though already I4 year...

Soluble salts are compounds found inside ornamental rocks and building stones exposed to atmospheric agents in environments rich alkaline metal ions, such as sodium potassium. The damage induced by their crystallization those materials, used build monuments architectural structures of great importance, is an unsolved problem. Sodium sulfate one the most common harmful salt these constructions. ...

Our paper (Arp et al. 2003) revises previous studies of Kaźmierczak and Kempe (1990, 1992), Kempe and Kaźmierczak (1990a, 1990b, 1993), and Kempe et al. (1996, 1997) on Lake Satonda reefs with regard to biofilm calcification and microbialite formation. We confirm that the transfer of bottom waters of increased alkalinity (due to sulfate reduction) to shallow water layers (mixolimnion) principal...

The nutritional composition of different acorn species (Q. pyrenaica, Q. robur, and ilex) harvested in Peneda-Gerês Park, Braga (north Portugal) was determined after being dehulled by methods (manually, thermally scalding with boiling water, drying at 30 °C). Ash protein contents remained unaltered, but the fat carbohydrate increased and/or decreased depending on dehulling method Quercus spp. t...

The purpose of this study is to understand mineral diagenesis authigenic mineral and the effect of climate on mineral of Pleistocene-Holocene sediment deposits in the Southern Kenya Rift. Lake Magadi unique geologic settings are characterized by extreme alkalinity and high silica activities. The mineralogical analysis was achieved by X-Ray diffraction (XRD) and Scanning Electron Microscopy (SEM...