36 research outputs found
Taxonomic notes on two powdery mildews: Phyllactinia chorisiae and Ovulariopsis wissadulae (Erysiphaceae: Phyllactinieae)
The powdery mildew Phyllactinia chorisiae has been considered conspecific with P. guttata. A re-examination of the type material of P. chorisiae and another specimen showed that this fungus, unlike P. guttata, has dimorphic conidia and its anamorph does not belong to the genus Ovulariopsis, which is the typical anamorph for Phyllactinia species. This suggests that P. chorisiae is morphologically distinct from P. guttata and should no longer be accepted as a synonym. Re-evaluation of type material of Oidiopsis wissadulae revealed that it has monomorphic conidia (mostly lemon-shaped) and hemiendophytic mycelium, a combination of characters that clearly places this fungus in the genus Ovulariopsis. Emended descriptions of P. chorisiae and Ovulariopsis wissadulae are presented
Understanding Hawking radiation from simple models of atomic Bose-Einstein condensates
This chapter is an introduction to the Bogoliubov theory of dilute Bose
condensates as applied to the study of the spontaneous emission of phonons in a
stationary condensate flowing at supersonic speeds. This emission process is a
condensed-matter analog of Hawking radiation from astrophysical black holes but
is derived here from a microscopic quantum theory of the condensate without any
use of the analogy with gravitational systems. To facilitate physical
understanding of the basic concepts, a simple one-dimensional geometry with a
stepwise homogenous flow is considered which allows for a fully analytical
treatment.Comment: 41 pages. to appear in the proceedings of the IX SIGRAV School on
'Analogue Gravity', Como (Italy), May 201
Estudo da associação entre caracterÃsticas de desempenho e de carcaça de suÃnos por meio de correlação canônica
Herança da resistência do mamoeiro a doenças fúngicas com base em análise dialélica de Hayman
Efeito da aplicação de silicato de cálcio em Brachiaria rizantha cv. Marandu sobre a população de ninfas do percevejo castanho das raÃzes Scaptocoris carvalhoi Becker, 1967, caracterÃsticas quÃmicas do solo, planta e produção de matéria seca
Powdery mildew on Passiflora in Australia
Oidiopsis sp., the anamorph of Leveillula taurica (Erysiphaceae), is reported for the first time in Australia on Passiflora edulis, and Oidium passiflorae on Passiflora foetida. A detailed description and illustration of the specimens are given