103 research outputs found
On the presence of Mittenothamnium reduncum (Hypnaceae) in Argentina
Mittenothamnium reduncum, un nuevo registro para la flora briológica de Argentina, se describe, ilustra y comenta brevemente. Se presentan las diferencias morfológicas entre este taxón y M. reptans, la especie más frecuente en el áreaMittenothamnium reduncum is recorded for the first time for the bryological flora of Argentina. A brief description, illustration, and discussion of the species are provided. Morphological differences between this taxon and M. reptans, the most frequent species in the area, are presented.Fil: Colotti, Maria T.. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo; ArgentinaFil: Suarez, Guillermo Martin. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; ArgentinaFil: Schäfer verwimp, Alfons. Mittlere Letten 11, 88634 Herdwangen-schãnach, German; Alemani
New features of flat (4+1)-dimensional cosmological model with a perfect fluid in Gauss-Bonnet gravity
We investigated a flat multidimensional cosmological model in Gauss-Bonnet
gravity in presence of a matter in form of perfect fluid. We found analytically
new stationary regimes (these results are valid for arbitrary number of spatial
dimensions) and studied their stability by means of numerical recipes in
4+1-dimensional case. In the vicinity of the stationary regime we discovered
numerically another non-singular regime which appears to be periodical.
Finally, we demonstrated that the presence of matter in form of a perfect fluid
lifts some constraints on the dynamics of the 4+1-dimensional model which have
been found earlier.Comment: 14 pages, 5 figures, 1 table; v2 minor corrections, conclusions
unchange
New national and regional bryophyte records, 49
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