Applications of Remote Sensing in Geoscience

Remote sensing is becoming an important and useful tool in mapping large, remote areas and has many applications in geosciences such as geologic and geo-structural mapping, mineral and water exploration, hydrocarbon exploration, natural hazards analysis, and geomorphology. The recent advances in remote-sensing imaging acquisition and availability of images can help geoscientists to explore and prepare maps quickly and evaluate the geo-potential of any specific area on the globe. Advances in remote-sensing data analysis techniques have improved the capacity to map the geological structures and regional characteristics and can serve in mineral exploration in complex and poorly understood regions. In this chapter, geophysical remotely sensed data (airborne geophysics) are integrated with other sources of remotely sensed data to analyze three separate areas, one each for geological structure, lineament presence and orientation, and geothermal potential. Three case studies are discussed in this chapter from three countries—Afghanistan, United Arab Emirates, and Algeria—to show the effectiveness of remote sensing in mapping and detecting geo-structural, geomorphological, and geothermal characteristics of ground surfaces

Hyper-proteolytic mutant of Beauveria bassiana, a new biological control agent against the tomato borer

The world tomato production is threatened by the invasive tomato borer Tuta absoluta. Difficulties in managing this pest were imposed mainly by the development of resistance in strains treated with conventional chemical insecticides. Resistance problems were even reported to insecticides of natural origin, leading to search for other control alternatives. P2 is a spontaneous mutant of the entomopathogenic fungus Beauveria bassiana. It was previously selected from a local strain (P1) and was characterized as hyper-producer of extracellular proteases. Here, the insecticidal potential of P1 and P2 strains was evaluated against T. absoluta larvae under laboratory conditions. Both strains were effective but P2 showed stronger effect than P1; median lethal concentration of P2 is tenfold lower than that of P1. Enzymatic assay analysis showed that extracellular enzymes are differently expressed by the two strains, especially proteases and chitinases which are known as cuticle degrading enzymes. The major expressed subtilisin-like protease (SBP) was upregulated at the transcriptional level in P2 strain. Proteomic analysis revealed four SBP isoforms which are highly overexpressed in this strain compared to P1. Post-translational regulation, most probably phosphorylation, was further suggested to control the SBP protease expression in B. bassiana P1 and P2 strains. The enzymatic profile in the two strains might explain their different insecticidal potential against the tomato borer. This is the first report showing such efficiency of Beauveria strains against this dangerous pest. Particularly, P2 strain showed high virulence reaching almost total larval mortality within 5 days post-application. It thus should be recommended as a new tool for the biocontrol of T. absoluta