Levantamento de rizóbios isolados de nódulos de caupi cultivado em amostras de solos do cerrado do Estado do Piauí.

Cultivo de plantas iscas. Isolamento de nódulos, carcterização dos isolados. Resultados e discussão. Referências bibliográficas. Anexo 1. Anexo 2.bitstream/CNPAB-2010/27392/1/doc125.pd

Bactérias Diazotróficas Endofíticas em Cultivares de Milho em Áreas de Cerrado e Mata no Estado de Roraima.

bitstream/item/53429/1/DOC-43-2010-ID-82-1.pd

APPLICATION OF DUPLEX STAINLESS STEEL FOR WELDED BRIDGE CONSTRUCTION IN AGGRESSIVE ENVIRONMENT

Maintenance costs are a significant item in life cycle of steel bridges, becoming of paramount importance in aggressive environments. The use of duplex stainless steels for bridge decks would be a major step forward in providing durable, low maintenance structures, exploiting both their corrosion resistance and high mechanical properties, capable of meeting in full the required structural safety performances. A research project partially funded by the EU research programme RFCS (Research Fund for Coal and Steel, Bridgeplex contract RFS-CR-04040) is developing technical information on the use of duplex stainless steel in welded bridge construction via mechanical testing and numerical analyses, so as to provide indications suitable to form the basis for an upgrade of Eurocode 3 [1] and to allow a reliable Life Cycle Cost analysis for this kind of structures so as to address the best material choice for the future bridges. The project is still in progress but first results are available. This paper gives an overview of the project and summarizes results obtained, deeper detailed in other papers presented at the International Conference Duplex 2007 ([5] and [6]). In particular the paper is concerned with: · overview of critical details in a welded bridge deck and relevant data available in literature also on austenitic and austeno-ferritic steels; and · economical evaluations considering maintenance aspects and fabrication costs showing the advantages of the application of duplex stainless steel to defined bridge typologies

Cerebrovascular risk in restless legs syndrome: Intima-media thickness and cerebral vasomotor reactivity: A case\u2013control study

Purpose: Although some studies have suggested an association between cardiovascular disease and restless legs syndrome (RLS), the mechanisms underlying this relationship remain unclear. The intima-media thickness (IMT) and vasomotor reactivity are two simple, non-invasive tools to investigate preclinical atherosclerosis and microangiopathy, respectively. The aims of this study were to evaluate carotid IMT and to explore vasomotor reactivity in idiopathic RLS (iRLS) patients. Patients and Methods: We enrolled 44 iRLS after exclusion of patients with secondary causes of RLS, history of vascular events, known uncontrolled vascular risk factors and other neurological disorders. Forty-four age and sex matched controls were therefore recruited. No significant differences in demographic data and vascular risk factors were found between the two groups. Carotid IMT was measured with a high-resolution B-mode ultrasound on the far-wall of common carotid artery, 10 mm and 30 mm to the carotid bulb. Vasomotor reactivity to hypo-and hypercapnia was assessed, by right middle cerebral artery transcranial Doppler, accordingly to the changes in peak systolic velocity, peak diastolic velocity and mean blood flow velocity. Results: Mean IMT was significantly increased in patients with iRLS when measured immediately proximally to carotid bifurcation (0.73; sd=0.17), versus controls (0.65; sd=0.13); p=0.035. Patients showed higher cerebrovascular flow velocities (CBFVs) compared to controls. After multivariate analysis, age, hypertension and iRLS proved to be independent IMT predictors. Conclusion: Increased IMT and higher CBFVs in iRLS support the association of iRLS with vascular damage, possibly through enhanced atherogenesis and sympathetic hyperactivity. However, to clarify a causal relationship, further longitudinal assessment of these parameters is needed, trying to control all their physiological modifying factors