Approach to determine nodal surfaces of some s-electron systems.

The paper is devoted to the study of the nodal surfaces of the wave functions for fermion systems. Using the quantum Monte Carlo method, implicit equations of nodal surfaces for some s-electron systems containing two-five electrons are numerically obtained. The obtained results are in agreement with the provisions of other researchers.

Occurrence of ochratoxin A producing fungi in wine and table grapes in Israel.

A 3-year survey was conducted to assay the number of Aspergillus Section Nigri isolates and in vitro ochratoxin A (OTA) production capacity in 10 vineyards in Israel. The survey included field sampling of two wine cultivars, 'Sauvignon Blanc' and 'Cabernet Sauvignon' as well as the table grape cultivar 'Superior'. A total of 2114 isolates were analyzed and of those 161 isolates were shown to produce OTA.