Produção de pólen por abelhas melíferas (Apis mellifera) em área de cultivo de manga (Mangifera indica L.) no projeto irrigado de Maniçoba, Juazeiro-BA.

Para incrementar a produção da manga em áreas irrigadas no Vale do Submédio São Francisco, os produtores utilizam colmeias de abelhas Apis mellifera, que realizam sua polinização. Entretanto, não se sabe se paralelamente os apicultores poderiam aproveitar as abelhas nas áreas de cultivo também para a produção de pólen apícola. Desta forma, este trabalho foi realizado com o objetivo de avaliar a produção de pólen por colmeias de A. mellifera em área de cultivo de manga no projeto irrigado de Maniçoba, Juazeiro-BA. O pólen foi coletado por meio de coletor de pólen frontal em duas colmeias previamente padronizadas quanto à quantidade de áreas de cria e alimento estocado. As coletas foram realizadas a cada 24 horas, por cinco dias consecutivos, em outubro de 2011. Os grãos de pólen retirados dos coletores foram armazenados em embalagens plásticas individuais, secados em estufa a 40-50ºC, durante 24 horas e, em seguida, pesados em balança de precisão. A coleta de pólen foi baixa em ambas as colônias durante todo o período experimental. No entanto, em cada dia, a colônia 1 coletou relativamente mais pólen que a colônia 2, embora estas diferenças não foram significativas. Seria necessário repetir o experimento em maior número de áreas de cultivo para confirmar que a produção é realmente muito baixa, e assim, não indicar esta atividade como alternativa para os apicultores da região

Dinâmica populacional de inimigos naturais em cultivos de helicônia spp. no nordeste paraense.

SICONBIOL. ID - 156

Production, breeding and potential of cowpea crop in Brazil.

About 50 years ago cowpea was reported as a relatively minor tropical legume. However, in the last years, it has been emerging as one of the most important food legume of the 21st century (SINGH, 2010). Brazil is not out of this panorama. Brazilian agriculture is undergoing major technological changes and, in addition, globalization in agribusiness has caused impacts on the production chain of several crops, particularly those heavily dependent on the use of a large volume of agricultural inputs, mainly fertilizers and pesticides. Such crops have had a higher production cost each year. On the other hand, this situation has brought new opportunities. Business farmers have sought new alternatives for their production arrangements. In this context cowpea constitutes one of the best options.bitstream/item/85620/1/Doc-216-Production.pd

Sr-Nd isotope signatures of surficial sediments from the Portuguese continental shelf

This study focus on the Sr-Nd isotope signatures of detrital and carbonate fractions of seven samples from surficial sediments deposited in the Portuguese continental shelf. 87Sr/86Sr and 143Nd/144Nd isotope compositions of the lithic component are used to constrain potential endmember contributions and determine sediment provenance. The 87Sr/86Sr ratios measured in the acid leachates of the seven sediment samples (carbonate fraction) lie within the range 0.7088 – 0.7092, close to the value for modern seawater (0.7091 – 0.7092), suggesting a dominant biogenic origin for this component. In contrast, the Sr isotope signatures for acid-leached silicate residues (lithic fraction) from the same samples are widely variable (87Sr/86Sr = 0.7179 to 0.7346) reflecting the input of terrigenous particles from three distinct sources (northern Iberian Variscan crust, southern Iberian Variscan crust and North African aerosols). The narrow range of ƐNd(0) values displayed by these samples (-8.5 to -10.6) does not allow effective discrimination between the different endmembers

Purinergic P2 receptors trigger adenosine release leading to adenosine A2A receptor activation and facilitation of long-term potentiation in rat hippocampal slices

Electrophysiological recordings were used to investigate the effects of ATP analogues on [theta]-burst-induced long-term potentiation (LTP) in rat hippocampal slices. [alpha],[beta]-Methylene ATP ([alpha],[beta]-MeATP; 20 [mu]M) decreased LTP from 36±9% to 17±5%, an effect prevented by adenosine A1 receptor blockade in accordance with the localised catabolism of ATP analogues into adenosine, leading to adenosine A1 receptor activation. Thus, to probe the role of extracellular ATP, all experiments were performed with the A1 receptor selective antagonist, 1,3-dipropyl-8-cyclopentylxanthine (50 nM). In these conditions, [alpha],[beta]-MeATP or 5'-adenylylimido-diphosphate ([beta],[gamma]-ImATP; 20 [mu]M) facilitated LTP by 120%, an effect prevented by the P2 receptor antagonists, pyridoxalphosphate-6-azophenyl-2'-4'-disulphonic acid (PPADS; 20 [mu]M) or suramin (75 [mu]M), as well as by the P2X1/3-selective antagonist 8-(benzamido)naphthalene-1,3,5-trisulfonate (10 [mu]M). The facilitations of LTP by either [alpha],[beta]-MeATP or [beta],[gamma]-ImATP (20 [mu]M) were also prevented by both 4-(2-[7-amino-2-(2-furyl(1,2,4)-triazolo(2,3a)-(1,3,5)triazin-5-yl-amino]ethyl)phenol (50 nM) or 7-2(-phenylethyl)-5-amino-2-(2-furyl)-pyrazolo-[4,3-e]-1,2,4-triazolo[1,5-c] pyrimidine (50 nM), antagonists of facilitatory adenosine A2A receptors, were occluded by the A2A receptor agonist, CGS 21680 (10 nM) and were prevented by the protein kinase C inhibitor, chelerythrine (6 [mu]M) and unaffected by the protein kinase A inhibitor, H89 (1 [mu]M). Furthermore, [beta],[gamma]-ImATP (20 [mu]M) enhanced [3H]adenosine outflow from rat hippocampal slices by nearly 150%, an effect prevented by PPADS (20 [mu]M) or suramin (75 [mu]M). The adenosine transport inhibitors, nitrobenzylthioinosine (5 [mu]M) and dipyridamole (10 [mu]M) also prevented [beta],[gamma]-ImATP (20 [mu]M)-induced [3H]adenosine outflow and facilitation of LTP. These results suggest that ATP analogues facilitate LTP through P2 receptor activation that mainly triggers adenosine release leading to the activation of adenosine A2A receptors.http://www.sciencedirect.com/science/article/B6T0F-49SFDNY-1/1/bd15c287ddd50f5af9c1be35dcb9227