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Leucyl-tRNA synthetase-dependent and -independent activation of a group I intron.
Boniecki, Michal T,Rho, Seung Bae,Tukalo, Mikhail,Hsu, Jennifer L,Romero, Eliana P,Martinis, Susan A American Society for Biochemistry and Molecular Bi 2009 The Journal of biological chemistry Vol.284 No.39
<P>Leucyl-tRNA synthetase (LeuRS) is an essential RNA splicing factor for yeast mitochondrial introns. Intracellular experiments have suggested that it works in collaboration with a maturase that is encoded within the bI4 intron. RNA deletion mutants of the large bI4 intron were constructed to identify a competently folded intron for biochemical analysis. The minimized bI4 intron was active in RNA splicing and contrasts with previous proposals that the canonical core of the bI4 intron is deficient for catalysis. The activity of the minimized bI4 intron was enhanced in vitro by the presence of the bI4 maturase or LeuRS.</P>
Diet of Water Striders (Gerris lacustris L. 1758) in a Rice Field Near Seoul, Korea
Olejniczak Izabella,Boniecki Pawel,Jabłoski Piotr,이상돈 한국응용곤충학회 2007 Journal of Asia-Pacific Entomology Vol.10 No.1
Diet composition of Gerris lacustris in a rice-field was compared with the composition of insect fauna from sweep nets conducted in the same habitat. Diptera was the most common prey among the insects potentially available to waterstriders. Water striders consumed Diptera, Homoptera and Hymenoptera in larger proportions than proportions of these orders in the sweep samples. There was no indication of prey size preferences in water striders as they appeared to capture prey of various size classes in frequencies corresponding to the frequencies in sweep samples. This is the first report of the diet of G. lacustris and the second report of the diet composition of any Gerris sp. water strider.
Feather holes and flight performance in the barn swallow Hirundo rustica
Piotr Matyjasiak,Paweł Boniecki,Maciej Fuszara,Mateusz Okołowski,Izabela Olejniczak 한국통합생물학회 2018 Animal cells and systems Vol.22 No.2
Feather holes are small (0.5–1 mm in diameter) deformities that appear on the vanes of flight feathers. Such deformities were found in many bird species, including galliforms and passerines. Holey flight feathers may be more permeable to air, which could have a negative effect on their ability to generate aerodynamic forces. However, to date the effects of feather holes on flight performance in birds remained unclear. In this study we investigated the relationship between the number of feather holes occurring in the wing or tail feathers and short term flight performance traits – aerial manoeuvrability, maximum velocity and maximum acceleration – in barns swallows, which are long distance migrating aerial foragers. We measured short-term flight performance of barn swallows in a standardized manner in flight tunnels. We found that acceleration and velocity were significantly negatively associated with the number of holes in the wing flight feathers, but not with those in the tail feathers. In the case of acceleration the negative relationship was sex specific – while acceleration significantly decreased with the number of feather holes in females, there was no such significant association in males. Manoeuvrability was not significantly associated with the number of feather holes. These results are consistent with the hypothesis that feather holes are costly in terms of impaired flight. We discuss alternative scenarios that could explain the observed relationships. We also suggest directions for future studies that could investigate the exact mechanism behind the negative association between the number of feather holes and flight characteristics.
Diet of Water Striders (Gerris lacustris L. 1758) in a Rice Field Near Seoul, Korea
Izabella, Olejniczak,Pawel, Boniecki,Piotr, Jablonski,Lee, Sang-Don Korean Society of Applied Entomology 2007 Journal of Asia-Pacific Entomology Vol.10 No.1
Diet composition of Gerris lacustris in a rice-field was compared with the composition of insect fauna from sweep nets conducted in the same habitat. Diptera was the most common prey among the insects potentially available to waterstriders. Water striders consumed Diptera, Homoptera and Hymenoptera in larger proportions than proportions of these orders in the sweep samples. There was no indication of prey size preferences in water striders as they appeared to capture prey of various size classes in frequencies corresponding to the frequencies in sweep samples. This is the first report of the diet of G. lacustris and the second report of the diet composition of any Gerris sp. water strider.