Various experiments led in laboratory on the concentrate of Angico dos Dias phosphate allowed us to define the following steps in the process of hydrochloric treatment: 1 – Acidification of the concentrate by HCl at 20% during two hours at ambient temperature (solid/liquid ratio of 40%, agitation speed of 200 rpm). In these conditions, the solubilisation rates of CaO and P2O5 are commonly super...

A general assumption about the geochemical behavior of phosphorus (P) is that it exists exclusively in +5 oxidation as phosphate. However, extremely reducing environments, other states such +3 may also be stable. Such environments—if prevalent globally—may determine planetary habitability, which part governed by nutrient availability, including availability element phosphorus. Here we show a ro...

This study aimed to analyze and quantify the effect of different ratios vermicompost, phosphate rock, sulfur on P solubilization release by Pseudomonas fluorescens Ur21, identify optimal levels those variables for an efficient biofertilizer. Twenty experiments were defined surface response methodology based a central composite design (CCD), effects various quantities (encoded −1, 0, or +1) was ...

This paper reviews the latest information and perspectives on global phosphorus scarcity. Phosphorus is essential for food production and modern agriculture currently sources phosphorus fertilizers from finite phosphate rock. The 2008 food and phosphate fertilizer price spikes triggered increased concerns regarding the depletion timeline of phosphate rock reserves. While estimates range from 30...

The pharmacokinetic models proposed for atracurium or cisatracurium are based on the assumption that spontaneous degradation via Hofmann elimination proceeds in vivo at the same rate as measured in vitro at pH 7.4 and 37 degrees C. As different degradation rates have been reported for all 10 stereoisomers of atracurium measured together, for each of its three isomeric groups, and for the single...

Aims: Soils in Ghana's coastal savanna are typically poor phosphorus (P), which has an impact on crop growth and productivity. The majority of West African phosphate rock formations not reactive; therefore, their direct applications do facilitate easy P availability to crops. Co-composting organic waste with using phosphorus-solubilizing microorganisms is the new paradigm adopted by scientists ...