Riding a Spiral Wave: Numerical Simulation of Spiral Waves in a Co-Moving Frame of Reference

We describe an approach to numerical simulation of spiral waves dynamics of large spatial extent, using small computational grids.Comment: 15 pages, 14 figures, as accepted by Phys Rev E 2010/03/2

Yield and Quality Parameters of an Interspecific Hybrid \u3cem\u3ePennisetum Purpureum\u3c/em\u3e Schum. (Elephant-Grass) \u3cem\u3eX Pennisetum Glaucum\u3c/em\u3e (L.) R. Br. Stuntz (Pearl Millet)

Elephant-grass is a tropical forage grass used either as a supplement fodder or for direct grazing. It usually shows regular nutritive value (6-13% crude protein, CP, and 55-60% forage digestibility) (Alcantara et al., 1981). Most of the available cultivars produce no viable seeds. On the other hand, pearl millet has high seed yielding potential along with high quality forage (\u3e15% CP and 70% forage digestibility). However, it shows poor forage production, low field persistence under grazing and low regrowth potential after cutting or grazing. During the 90\u27s, an interspecific hybrid between the two species was developed, trying to combine the elephant-grass adaaptability and forage yielding potential with the pearl millet forage quality and seed yielding potential (Schank et al., 1993; Schank, 1996). The new genetic material was able to produce viable seeds in variable amounts (Diz et al., 1995). The main aim of this research was to produce selected populations with high phenotypic uniformities, showing high average forage production and quality

Fracturas del primer metatarsiano. Valoración funcional a largo plazo

Hemos revisado la evolución y resultado final de 24 fracturas del primer metatarsiano tratadas y seguidas en nuestro Hospital «La Fe» de Valencia, durante el periodo comprendido entre 1982 y 1993. Los tratamientos fueron mediante osteosíntesis con agujas de Kirschner y enyesado en 10 casos y con enyesado solamente en 14 pacientes. Las causas más frecuentes fueron los accidentes de tráfico en un 66%. Las fracturas abiertas correspondieron al 37%. Los resultados tras un seguimiento medio de 7 años fueron malos en el 86% de los tratamiento conservadores y en el 70% de los tratamientos quirúrgicos. Las secuelas más frecuentes fueron las metatarsalgias en un 4 1 % de los pacientes.We reviewed the final results in 24 fractures of the first metatarsal bone treated in our hospital during a two-year period (1982-1983). The treatment consisted of Kirschner's wire fixation and plaster cast in 10 cases and only casting in 14 patients. The most frequent cause of fracture was traffic accident (66% of the cases). Open fractures were found in 37% of the cases. The results after a follow-up period of 7 years were poor in 86% of the conservative treatments and in 70% of the surgical treatments. The most frequent sequela was metatarsalgia in 41 % of the patients

New Pigeon Pea (\u3cem\u3eCajanus Cajan\u3c/em\u3e) Hybrids With Desirable Forage Traits

Pigeon pea is a tropical forage legume usually sown in mixed pastures with tropical forage grasses. Most of the available cultivars shows erect and tall plants with poor tillering potential, breakable thick stems, low leaf/stem ratios (fresh/dry matter) and low persistence under animal grazing. It shows a high dry matter production, due to low leaf/stem ratios (Barnes & Addo, 1997). Pigeon pea shows good crude protein levels/dry matter (ranging from 14-23%) and regular in vitro digestibility indexes (52-58%) (Karachi & Matata, 1996); animal consumption is affected by high tannin levels of young leaves. Being a self-pollinated species, the variability for forage traits occurs among cultivars available at germplasm banks. No significant variation is observed for any forage character within a given population. Effective selection and releasing of new genetic materials bearing desirable morpho-agronomic and forage traits is mostly dependent on increases of genetic variation, which may be accomplished through artificial crossings between selected parentals. This research work was aimed at the synthesis of new pigeon pea hybrids, hopefully bearing new desirable forage characters

Production and Mineral Composition of Tropical Grasses Sown under a Pine Plantation

A trial was conducted in Brazil to evaluate the performance of 6 tropical grasses: tanzania (Panicum maximum cv. Tanzania), green-panic (P. maximum var. Trichoglume), aruana (P. maximum cv. Aruana), brizanta (Brachiaria brizantha), humidicola (B. humidicola) and tifton-85 (Cynodon dactylon cv. Tifton 85), planted under two different densities of pines (Pinus elliottis): 200 and 400 stems/ha, as well as in the full sunlight. The results showed that the dry matter yield decreased as shading increased. The grasses tanzania and brizanta were the most tolerant to shading. Although N concentration increased with shading, the total N yield was still lower than that obtained with grasses in full sunlight, probably due to higher soil acidity and to lower nutrient content under the pines. The concentrations of P, K, Mg and S were higher and those of Ca lower under shading conditions. All elements were at adequate level, except for Tifton-85 that presented a low N content and a high content of S, probably due to the fact that this grass is more demanding in soil N. It is concluded that other factor besides light influenced DM and N yields; but even so, it was possible to obtain a satisfactory biomass production under shading conditions

Nutritive Quality of Tropical Grasses Sown under a Pine Plantation

A trial was conducted in Brazil to evaluate the nutritive quality of 6 tropical grasses: tanzania (Panicum maximum cv. Tanzania), green-panic (P. maximum var. Trichoglume), aruana (P. maximum cv. Aruana), brizanta (Brachiaria brizantha), humidicola (B. humidicola) and tifton-85 (Cynodon dactylon cv. Tifton 85), planted under two different densities of pines (Pinus elliottis): 200 and 400 stems/ha, as well as in full sunlight. The results showed a significant increase in protein content and a significant decrease in NDF and cellulose contents as tree density increased. Comparing the values obtained under shading conditions with those obtained in the open, it was observed an increase in the contents of CP (+2,47), ADF (+0,73), lignin (+1,38), ash (+0,87) and in the digestibility (+2,16), and a decrease in the contents of NDF (-3,46), hemicellulose (-4,19) and cellulose (-1,20) in percentage units. Tanzania presented the best nutritive quality under shade: 13 % CP, 32 % cellulose, 5 % lignin and a digestibility of 54%. This grass was also the best under full sunlight, showing that it was the less sensitive to shading. It was concluded that, although less productive, the nutritive quality of tropical grasses was enhanced by shading

Expected investment of Tocantins farmers, Brazil, to apply integrated crop-livestock system during Embrapa's technology transfer

In this presentation, we report the data of these farmers collected in the beginning of the project to analyze their current conditions and expectations regarding the implementation of the new integrated system