Preservation of fresh coconut gratings by hurdle technique

Hurdle technology employs the intelligent combination of different preservation factors to achieve mild but reliable preservation effects. Fresh coconut gratings treated with different combinations of hurdles such as acidulants, humectants, preservatives, antioxidants, a mild heat treatment and packaging were evaluated for changes in physicochemical and sensory properties. It is possible to preserve the grating for four weeks in laminated polythene packages at 5 degrees C in combination with 3% sodium chloride, 0.3% citric acid, 0.009% sodium citrate, 0.02% butylated hydroxyanisole.

Symmetrically tapered <30-micron-thick quasi-planar Ge waveguides as chemical sensors for microanalysis

Symmetrically tapered planar IR waveguides have been fabricated by starting with a ZnS coated concave piece of single-crystal Ge, embedding it in an epoxide resin as a supporting substrate, and then grinding and polishing a planar surface until the thickness at the taper minimum is <30 μm. Such tapering is expected to enhance a waveguide's sensitivity as an evanescent wave sensor by maximizing the amount of evanescent wave energy present at the thinnest part of the waveguide. As predicted by theory, the surface sensitivity, i.e., the absorbance signal per molecule in contact with the sensing region, increases with decreasing thickness of the tapered region even while the total energy throughput decreases. The signal-to-noise ratio obtained depends very strongly on the quality of the polished surfaces of the waveguides. The surface sensitivity is superior to that obtained with a commercial Ge attenuated total reflection (ATR) accessory for several types of sample, including thin films (<10 ng) and small volumes (<1 μL) of volatile solvents. By using the waveguides, light-induced structural changes in the protein bacteriorhodopsin were observable using samples as small as ∼50 pmol (∼1 μg). In addition, the waveguide sensors can reveal the surface compositions on a single human hair, pointing to their promise as a tool for forensic fiber analysis.

Variable incidence angle subwavelength grating SPR graphene biosensor

This paper investigates the sensitivity enhancement of a variable incidence angle subwavelength grating based multilayer surface plasmon resonance biosensor (SPRB). In the proposed design, a periodic array of subwavelength grating is integrated on top of a layer of graphene sheet in the multilayer SPR biosensor. The performance of the biosensor is investigated through monitoring the biomolecular interactions of cDNA-ssDNA interactions on its surface. The sensitivity improvement is indicated by the shift of the resonance peak angle.

Reflectance response of tapered optical fiber coated with graphene oxide nanostructured thin film for aqueous ethanol sensing

In this work, optical sensing performance of tapered multimode fiber tip coated with graphene oxide (GO) nanostructured thin film towards aqueous ethanol with different concentrations is investigated. The tapering process of the optical fiber is done by a glass processing machine. The multimode optical fiber tip is dip-coated with GO and annealed at 70 °C to enhance the binding of the nanomaterials to the silica fiber. FESEM, Raman microscopy and XRD analyses are performed to micro-characterize the GO thin films. The morphology of the GO is observed to be in sheets forms. The reflectance response of the GO coated fiber tip is compared with the uncoated tip. The measurements are taken using a spectrophotometer in the optical wavelength range of 550-720 nm. The reflectance response of the GO coated fiber tip reduced proportionally, upon exposure to ethanol with concentration range of 5-80%. The dynamic response of the developed sensor showed strong reversibility and repeatability when it is exposed to ethanol with concentrations of 5%, 20% and 40% in distilled water. At room temperature, the sensor shows fast response and recovery as low as 19 and 25 s, respectively. © 2014 Elsevier B.V.

Development NGOs, semiclientelism, and the state in the Philippines: from “crossover” to double-crossed

Civil-society participation continues to be a considerable focus of debate surrounding politics and public-policy making at international and national scales, especially in the developing world. Important examples of such processes have occurred in the Philippines. The Philippine polity is widely regarded as embodying a culture of clan-based politics entailing considerable relationships of clientelism and semiclientelism. Yet there is also considerable evidence of widespread civil-society activism. This paper examines how politically left-of-center development nongovernment organizations (NGOs) and people’s organizations (POs) have attempted to “cross over” to state positions in order to implement social and economic reforms. Select engagement by key personnel from the NGO sphere has often been premised on the notion that it was aimed at transforming these features of Philippine politics. Engagement with two recent and (claimed to be) reforming governments has not led to positive outcomes. The Philippine experience, for the most part, is an expression of the problematic assumptions that have tended to inform the debate over civil society and state interaction in many developing-country contexts. Such conceptions have been inserted into an all-encompassing notion of democratic transition, whereby political and economic liberalization are supposed to emerge in synergy, with civil society acting as a form of “stabilizer” compensating for and complementing the role of the state. Given the predominance of such weak states as the Philippines in the developing world, it is important to consider what the impacts of development NGOs participation may be. Most important, what may be the impacts of such forms of participation in a society and polity characterized by entrenched clientelist relationships? Contrasting a Gramscian analysis with Putnam-inspired conceptions of civil society that underpin the transition model, the paper argues that far from being a conditioning force on the state, civil society is itself a sphere where clientelism and semiclientelism predominate. So powerful are these forces, that arguably well-intentioned NGO personnel who previously adopted a critical stance toward neo-clientelism ultimately become absorbed by these relationships.