Role of f Electrons in the Optical and Photoelectrochemical Behavior of Ca(LaCe )S (0 ≤ x ≤ 1).

This study focuses on a solid solution series, Ca(LaCe )S (0 ≤ x ≤ 1), where the f electron density is absent in CaLaS and is progressively increased until it is maximized in CaCeS. Correspondingly, these samples, synthesized by a sealed ampule method, showed progressive variations in color ranging from gray for CaLaS to orange-red for CaCeS. The crystal structural nuances of both the end members and three solid solutions with x = 0.

Resistance to Russian wheat aphid biotype 2 in CIMMYT synthetic hexaploid wheat lines.

The Russian wheat aphid, Diuraphis noxia (Kurdjumov) (Hemiptera: Aphididae), devastates wheat and barley production on all continents except Australia. Although D. noxia-resistant cultivars exist, virulent D.

Sublethal effects of antibiosis resistance on the reproductive biology of two spittlebug (Hemiptera: Cercopidae) species affecting Brachiaria spp.

Several greenhouse experiments were used to measure how high levels of antibiosis resistance to nymphs in two interspecific Brachiaria (brachiariagrass) hybrids affect life history parameters of the spittlebugs Aeneolamia varia (F.) and Zulia carbonaria (Lallemand), two of the most important spittlebug (Hemiptera: Cercopidae) species affecting Brachiaria production in Colombia. The A.