910 research outputs found
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
Over‐Expression of Tricarboxylic Acid Metabolism Genes in Forage Crops \u3ci\u3eNeonotonia wightii\u3c/i\u3e and \u3ci\u3eBrachiaria brizantha\u3c/i\u3e Leads to Ectropic Root Development
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
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