Optical gratings fabricated using the capillary-assisted self-assembly of nanoparticles on a flexible substrate.

We demonstrate a cost-effective and high-throughput fabrication technique to deposit colloidal nanoparticles on a patterned polymer substrate using a capillary-assisted self-assembly method over a large area. In particular, we fabricate optical gratings using gold nanoparticles and a polymer substrate. We show the versatility of the technique over different nanoparticle diameters and grating periodicities.

Volunteer geographic information in the Global South: barriers to local implementation of mapping projects across Africa.

The world is awash in data-by 2020 it is expected that there will be approximately 40 trillion gigabytes of data in existence, with that number doubling every 2 to 3 years. However, data production is not equal in all places-the global data landscape remains heavily concentrated on English-speaking, urban, and relatively affluent locations within the Global North. This inequality can contribute to new forms of digital and data colonialism.

Low-dose ketamine infusion for labor analgesia: A double-blind, randomized, placebo controlled clinical trial.

Background: Most primary and secondary level hospitals in developing countries provide inadequate labor analgesia due to various medical, technical and economic reasons. This clinical trial was an effort to study the efficacy, safety and feasibility of intravenous (IV) ketamine to provide labor analgesia.

Materials And Methods: A total of 70 parturients were consented and randomly assigned to receive either IV ketamine or 0.