Interactions of accessible solitons with interfaces in anisotropic media: the case of uniaxial nematic liquid crystals

We investigate, both theoretically and experimentally, spatial soliton interaction with dielectric interfaces in a strongly anisotropic medium with non-locality, such as nematic liquid crystals. We throw light on the role of refractive index gradients as well as optic axis variations in both voltage- and self-driven angular steering of non-local solitons. We specifically address and then employ in experiments a suitably designed electrode geometry in a liquid crystalline cell in order to define and tune a graded dielectric interface by exploiting the electro-optic response of the material through the in-plane reorientation of the optic axis in two distinct regions. We study both refraction and total internal reflection as well as voltage controlled steering of spatial solitons

Synthesis and characterization of new dialkylacylphosphonylhydrazones.

Made available in DSpace on 2019-01-02T23:34:17Z (GMT). No. of bitstreams: 1 Synthesisandcharacterizationofnewdialkylacylphosphonylhydrazones.pdf: 2546236 bytes, checksum: 3827902dcae71a7626ffcbb140b73ae9 (MD5) Previous issue date: 2018-09-24bitstream/item/183428/1/Synthesis-and-characterization-of-new-dialkylacylphosphonylhydrazones.pd

Microcalorimeter as a Biologic Activity Monitor for the Study of \u3cem\u3eBrachiaria Brizantha\u3c/em\u3e Seed Germination Process

Calorimetry helps better understanding of biological processes (Calvet & Prat, 1963). Very sensitive thermal sensors and microcalorimeters allow real time investigation and monitoring heat production of seed germination but few experiments have been performed in this area (Sigstad & Prado, 1999). Moreover, experimental procedures correlating germination phenomena and chemical thermodynamics are exceptional (Barboza, 2002). One can detect calorimetrically the heat flow produced during seed germination and compare the results with data recorded using standard germination methodology (ISTA, 1985). Seed germination and the biomass increase respiration and determination of the energy involved aids understanding of the energetic cycle involved. This work analysed the germination of Brachiaria brizantha seeds, including the water uptake phase

Safety and effectiveness of Copaiba Oleoresin (C. reticulata Ducke) on inflammation and tissue repair of oral wounds in rats.

In traditional communities of the Brazilian Amazon, the copaiba oleoresin (C. reticulata Ducke) is widely known for its therapeutic activity, especially its wound healing and anti-inflammatory actions. Our study aimed to evaluate these effects in oral lesions and the safety of the dosage proposed. A punch biopsy wound was induced on the ventral surface of the tongue of forty-five male Wistar rats under anesthesia. Animals were randomly allocated to one of three groups based on the treatment: control, corticoid and copaiba. A daily dose of each treatment and vehicle was administrated by oral gavage for three consecutive days. Sample collections took place on the third, seventh and 15th days post-wounding for clinical and histopathological analyses. Blood was collected on the third and seventh days for kidneys and liver function tests. Semi-quantitative analyses were performed based on scores of inflammation and reepithelization. Tissue collagen deposition was detected by PicroSirius red staining. Copaiba-treated wounds revealed a smaller wound area, decreased of acute inflammatory reaction and enhanced reepithelization. The levels of kidney and liver function tests did not reveal presence of damage post-treatments. Our findings suggest that copaiba oleoresin is a safe and effective alternative therapy for inflammation and tissue repair of oral wounds in this animal model

Teste de inibição da enzima acetilcolinesterase de compostos organofosforados com potencial ação fungicida na cultura de mamão (Carica papaya L.).

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