Production of Gliotoxin in Unsterilized Soil
IT has long been recognized that microbial antagonisms exist in the soil, and the possibility that this might be due to production of antibiotics has been suggested although never actually proved.
Antagonistic interactions among seedborne microflora and dynamics of microbial incidence
Seed treatment of Phaseolus mungo Roxb. with non-volatile metabolites of dominant seed fungi such as Chaetomium indicum Corda and Curvularia lunata (Walker) Boedijn and the antibiotic substances: chetomin, curvularin and brefeldin reduced the percent incidence of microfungi and bacteria but induced the Streptomyces sp. The antagonistic behaviour of seed microflora was assessed in vitro.
Super-resolution of overlapped waves in time and frequency domain in a directional borehole radar measurement
The Multiple Signal Classification (MUSIC) algorithm is modified in order to resolve multiple waves and to estimate reflection points in 3-D space. This algorithm is suitable for directional borehole radar with a circular dipole array antenna. Making use of the spatial frequency difference of acquired array signals, the signals are decorrelated, and the 3-D MUSIC algorithm is applied. The time domain signals of the singlehole array-type borehole radar are used in order to form a measurement vector in the MUSIC algorithm. A computer simulation confirms that the proposed algorithm may estimate the directions of arrival (DOA) for three signals. Applying the proposed algorithm to field experiment data successfully estimates the DOA of a reflected wave from a fracture in rock.