Exploiting the capacity of 1mm PMMA step-index polymer optical fibers

Three different techniques are discussed that are currently under investigation at Siemens Corporate Technology – Information and Communications in order to exploit the bandwidth capacity of 1 mm PMMA Step-Index Polymer Optical Fiber (SI-POF). By using Adaptive Multitone Modulation (AMTM) a record result of 540 Mb/s transmission over 100 m of SI-POF is achieved

Produção e beneficiamento da própolis

O aumento no conhecimento sobre os benefícios da própolis para a saúde  humana tornou o mercado desse produto crescente em todo o mundo. Entretanto, também fez crescer a exigência com relação a sua qualidade, que por falta de conhecimento poderá ser afetada no processo de produção,  beneficiamento e armazenagem. A diversidade da flora apícola brasileira proporciona uma produção de  própolis com componentes diferenciados de acordo com a região onde é produzida. Por sua excelente qualidade, a própolis catarinense já é reconhecida tanto no mercado interno quanto externo. Com um mercado  consolidado e crescente, a atividade torna-se uma boa alternativa de renda para as famílias rurais.Este trabalho busca divulgar as mais recentes técnicas de produção e beneficiamento da própolis a fim de aprimorar o desenvolvimento da atividade por parte dos produtores e enriquecer o conhecimento dos técnicos  da área.

40-Gb/s Transmission over 100m Graded-Index Plastic Optical Fiber based on Discrete Multitone Modulation

Spectral-efficient 40-Gb/s discrete multitone transmission over 100m of graded-index plastic optical fiber is experimentally demonstrated by intensity-modulation of a 10-GHz DFBlaser (1302nm) and direct-detection with a 25-μm large diameter photodetector

A surface acoustic wave-driven micropump for particle uptake investigation under physiological flow conditions in very small volumes

Static conditions represent an important shortcoming of many in vitro experiments on the cellular uptake of nanoparticles. Here, we present a versatile microfluidic device based on acoustic streaming induced by surface acoustic waves (SAWs). The device offers a convenient method for introducing fluid motion in standard cell culture chambers and for mimicking capillary blood flow. We show that shear rates over the whole physiological range in sample volumes as small as 200 mu L can be achieved. A precise characterization method for the induced flow profile is presented and the influence of flow on the uptake of Pt-decorated CeO2 particles by endothelial cells (HMEC-1) is demonstrated. Under physiological flow conditions the particle uptake rates for this system are significantly lower than at low shear conditions. This underlines the vital importance of the fluidic environment for cellular uptake mechanisms

Wind Erosion: Its Control in Minnesota

This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu

The effect of long‐term hormonal treatment on voiding patterns during filling cystometry and on urethral histology in a postpartum, ovariectomized female rat

ObjectiveTo study whether long-term treatment with oestrogen (E(2) ), selective E(2) receptor modulators (SERMs), or growth hormone (GH) can prevent the development of abnormal voiding patterns during filling cystometry (CMG) in a postpartum, ovariectomized (Ovx) female rat.Materials and methodsImmediately after spontaneous delivery, 60 primiparous Sprague-Dawley rats were randomly divided into six equal groups. One group served as uninjured sham controls and five groups underwent intravaginal balloon dilatation. On day seven, previously dilated rats underwent bilateral Ovx and implantation of a subcutaneous hormone-delivery pump. The five treatment groups received normal saline (control), E(2) , raloxifene, levormeloxifene, or GH for 7 weeks. Conscious CMG was performed 7 weeks after Ovx. Urethral sphincter tissue was harvested for elastin immunohistochemistry and real-time polymerase chain reaction of α(1A) -adrenoceptor mRNA.ResultsNo abnormal voiding patterns were detected in the group treated with GH. The E(2) , raloxifene and levormeloxifene groups had greater detrusor overactivity and urethral relaxation incontinence than control rats. The raloxifene group had a significantly lower baseline bladder pressure and opening pressure. GH-treated rats had higher elastin content in the urethra. Urethral α(1A) -adrenoceptor mRNA concentration was significantly lower in the SERM-treated rats compared with controls.ConclusionsGH prevents the development of abnormal voiding patterns during filling CMG in a rat model of parturition-induced incontinence; E(2) and SERMs may worsen voiding patterns