Jacob Eyal
W. R. Grace and Company
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Featured researches published by Jacob Eyal.
Applied Biochemistry and Biotechnology | 1994
Jacob Eyal; A. Mabud; K. L. Fischbein; James Frederic Walter; Lance S. Osborne; Zdenek Landa
A new strain of the fungusBeauveria bassiana Nov. EO-1 (ATCC 74037), which produces a red pigment in solid and liquid culture, has been isolated from an infected whitefly. The red pigment was extracted and has been identified by mass spectrometry as oosporein, a potent dibenzoquinone mycotoxin.In order to assess the potential of this entomogenous fungi for microbial control purposes, a mycelium bead formulation was developed as a source for pathogenic conidial spores and oosporein production. The mycelium bead preparation was found to be a stable fungal carrier. Conidiation and germination studies have revealed the mycelium bead viability is 100% over a 1-yr period when stored at 4°C. Conidial spore production from the mycelium beads has been falling substantially per time from an initial value of 1.5 × 108 spores per bead to 3 × 105 spores per bead after a year storage at 4°C. However, the mycelium bead formulation continues to produce oosporein on agar media, at the same intensity throughout the 1 yr period.In in vitro and in vivo small scale greenhouse experimentsBeauveria bassiana Nov. EO-1 were compared with known entomogenous fungi,Beauveria sp. andPaceilomyces sp. Beauveria bassiana Nov. EO-1 was found to have a high pathogenicity against foliage insect pests (e.g., whiteflies and mealy bugs), and against soil insects (e.g., citrus root weevils). The utilization of a mycelium bead based on this strain,Beauveria bassiana Nov. EO-1, as a source of conidial spores and oosporein may have broad applications for the control of various insect pests.
Phytochemistry | 1994
Alexandr Jegorov; Petr Sedmera; Vladimír Maťha; Petr Šimek; Helena Zahradníčková; Zdeněk Landa; Jacob Eyal
New beauverolides L and La were isolated and identified from the entomopathogenic fungi, Beauveria tenella and Paecilomyces fumosoroseus. Their structures, cyclo-[3-hydroxy-4-methyldecanoyl-L-phenylalanyl-L-alanyl-D-leucyl ], and cyclo-[3-hydroxy-4-methyldecanoyl-L-phenylalanyl-L-alanyl-D-allo-i soleucyl] were deduced from HPLC and GC-mass spectrometric analyses of their hydrolysates and NMR and mass spectral data.
Biochemical Systematics and Ecology | 1994
Zbyněk Kadlec; Petr Šimek; Anna Heydová; Alexandr Jegorov; Vladimír Maťha; Zdeněk Landa; Jacob Eyal
Fungi of the genera Beauveria and Paecilomyces were found to produce cyclotetradepsipeptides, beauverolides. Production of beauverolides was not detected at the genus Tolypocladium. Analysis of beauverolides therefore provides a very simple chemotaxonomic test which seems to be suitable for fast discrimination between the genera Beauveria vs Tolypocladium and complementing morphological examination. A GC-MS study of β-hydroxy acid distribution in the beauverolide hydrolyzates revealed that all strains prdouce γ-methyl-β-hydroxy acids only. Their occurrence thus cannot be used as a taxonomic marker of different species within the genera Beauveria and Paecilomyces.
Archive | 1992
Jacob Eyal; James Frederic Walter; Lance Osborne; Zdenek Landa
Archive | 1990
Jacob Eyal; Bruce King Hamilton; George P. Tuszynski
Archive | 1991
Jacob Eyal; Bruce King Hamilton; George P. Tuszynski
Archive | 1990
Jacob Eyal; Michael G. Spencer
Archive | 1993
Jacob Eyal; Karen Louise Fischbein; James Frederic Walter
Archive | 1993
George P. Tuszynski; Jacob Eyal; Bruce King Hamilton
Archive | 1990
Jacob Eyal; Reuben T. Land; James Frederic Walter