scholarly journals Citizen-led sampling to monitor phosphate levels in freshwater environments using a simple paper microfluidic device

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0260102
Author(s):  
Samantha Richardson ◽  
Alexander Iles ◽  
Jeanette M. Rotchell ◽  
Tim Charlson ◽  
Annabel Hanson ◽  
...  
Keyword(s):  
Mobile Technology ◽  
High Frequency ◽  
Microfluidic Devices ◽  
Cost Effective ◽  
Smartphone App ◽  
Industrial Chemicals ◽  
Test Device ◽  
Paper Microfluidic ◽  
Freshwater Environments ◽  
Analytical Device

Contamination of waterways is of increasing concern, with recent studies demonstrating elevated levels of antibiotics, antidepressants, household, agricultural and industrial chemicals in freshwater systems. Thus, there is a growing demand for methods to rapidly and conveniently monitor contaminants in waterways. Here we demonstrate how a combination of paper microfluidic devices and handheld mobile technology can be used by citizen scientists to carry out a sustained water monitoring campaign. We have developed a paper-based analytical device and a 3 minute sampling workflow that requires no more than a container, a test device and a smartphone app. The contaminant measured in these pilots are phosphates, detectable down to 3 mg L-1. Together these allow volunteers to successfully carry out cost-effective, high frequency, phosphate monitoring over an extended geographies and periods.

scholarly journals Citizen-Led Sampling to Monitor Phosphate Levels in Freshwater Environments Using a Simple Paper Microfluidic Device

2021 ◽  
Author(s):  
Samantha Richardson ◽  
Alexander Iles ◽  
Jeanette M. Rotchell ◽  
Tim Charlson ◽  
Annabel Hanson ◽  
...  
Keyword(s):  
Microfluidic Device ◽  
Mobile Technology ◽  
High Frequency ◽  
Microfluidic Devices ◽  
Cost Effective ◽  
Smartphone App ◽  
Test Device ◽  
Monitoring Campaign ◽  
Paper Microfluidic ◽  
Freshwater Environments

We demonstrate how a combination of paper microfluidic devices and handheld mobile technology can be used by citizen scientists to carry out a sustained water monitoring campaign. We have developed a paper-based analysis device and a 3 minute sampling workflow that requires no more than a container, a test device and a smartphone app. The contaminant measured in these pilots are phosphates, detectable down to 3 mg L<sup>-1</sup>. Together these allow volunteers to successfully carry out cost-effective, high frequency, phosphate monitoring over an extended geographies and periods.

scholarly journals Citizen-Led Sampling to Monitor Phosphate Levels in Freshwater Environments Using a Simple Paper Microfluidic Device

2021 ◽  
Author(s):  
Samantha Richardson ◽  
Alexander Iles ◽  
Jeanette M. Rotchell ◽  
Tim Charlson ◽  
Annabel Hanson ◽  
...  
Keyword(s):  
Microfluidic Device ◽  
Mobile Technology ◽  
High Frequency ◽  
Microfluidic Devices ◽  
Cost Effective ◽  
Smartphone App ◽  
Test Device ◽  
Monitoring Campaign ◽  
Paper Microfluidic ◽  
Freshwater Environments

We demonstrate how a combination of paper microfluidic devices and handheld mobile technology can be used by citizen scientists to carry out a sustained water monitoring campaign. We have developed a paper-based analysis device and a 3 minute sampling workflow that requires no more than a container, a test device and a smartphone app. The contaminant measured in these pilots are phosphates, detectable down to 3 mg L<sup>-1</sup>. Together these allow volunteers to successfully carry out cost-effective, high frequency, phosphate monitoring over an extended geographies and periods.

scholarly journals Paper-based potentiometric sensing devices modified with chemically reduced graphene oxide (CRGO) for trace level determination of pholcodine (opiate derivative drug)

RSC Advances ◽  
2021 ◽  
Vol 11 (20) ◽  
pp. 12227-12234
Author(s):  
Hisham S. M. Abd-Rabboh ◽  
Abd El-Galil E. Amr ◽  
Elsayed A. Elsayed ◽  
Ahmed Y. A. Sayed ◽  
Ayman H. Kamel
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Cost Effective ◽  
Trace Level ◽  
Ion Sensing ◽  
Reduced Graphene ◽  
Chemically Reduced Graphene Oxide ◽  
Trace Level Determination ◽  
Analytical Device

Robust, reliable and cost-effective paper-based analytical device for potentiometric pholcodine (opiate derivative drug) ion sensing has been prepared and characterized.

THEORETICAL ANALYSES FOR LASER MACHINING MICROCHANNELS AND DEMONSTRATION OF THEIR USES IN MANUFACTURE OF A MICROFLUIDIC OPTICAL SWITCH

2006 ◽  
Vol 13 (06) ◽  
pp. 795-802 ◽  
Author(s):  
DANIEL LIM ◽  
ERNA GONDO SANTOSO ◽  
KIM MING TEH ◽  
STEPHEN WAN ◽  
H. Y. ZHENG
Keyword(s):  
Fluid Flow ◽  
Optical Switch ◽  
Low Cost ◽  
Microfluidic Devices ◽  
Cost Effective ◽  
Laser Machining ◽  
Machining Parameters ◽  
Flow Channels ◽  
Cost Effective Method ◽  
Theoretical Analyses

Silicon has been widely used to fabricate microfluidic devices due to the dominance of silicon microfabrication technologies available. In this paper, theoretical analyses are carried out to suggest suitable laser machining parameters to achieve required channel geometries. Based on the analyses, a low-power CO 2 laser was employed to create microchannels in Acrylic substrate for the use of manufacturing an optical bubble switch. The developed equations are found useful for selecting appropriate machining parameters. The ability to use a low-cost CO 2 laser to fabricate microchannels provides an alternative and cost-effective method for prototyping fluid flow channels, chambers and cavities in microfluidic lab chips.

scholarly journals Safe and cost-effective rapid-prototyping of multilayer PMMA microfluidic devices

2016 ◽  
Vol 20 (12) ◽  
Author(s):  
Antonio Liga ◽  
Jonathan A. S. Morton ◽  
Maïwenn Kersaudy-Kerhoas
Keyword(s):  
Rapid Prototyping ◽  
Microfluidic Devices ◽  
Cost Effective

scholarly journals Assessment of the Extent and Causes of Fuelwood Collection in the Surrounding Communities of Kasewe Reserved Forest, Sierra Leone

2021 ◽  
Vol 25 (7) ◽  
pp. 1271-1276
Author(s):  
A.H. Koroma ◽  
A. Mansaray ◽  
A. Sesay
Keyword(s):  
Sierra Leone ◽  
High Frequency ◽  
Cost Effective ◽  
Forest Degradation ◽  
Sustainable Utilization ◽  
Factors Affecting ◽  
Cooking Process ◽  
Domestic Use ◽  
Preferred Species ◽  
Significant Factors

Seven (7) communities living in and around the Kasewe forest reserved were sampled to assess the extent and causes of fuelwood collection from the reserved forest involving 50 individuals in stratified random technique with a view to evaluate the degree and reasons for fuelwood collection from the Kasewe reserved forest. Data obtained indicate a high frequency of fuelwood harvest in the forest throughout the year. The significant factors affecting such decisions were availability and accessibility, ensure fast cooking process, and cost-effective. In addition, fuelwood activities were intensive throughout the year but peaks late dry season. Hence 48 (96%) of respondents stated forest degradation as one of the significant threats posed by fuelwood collectors to the forest. The study indicates that 100% of the collector are unemployed this was mainly the reason why residents of those communities collect fuelwood from the reserved forest. However, this study concluded that fuelwood collectors were selective over the kind of species they harvest, but the preferred species were not replanted. Fuelwood in the study area is not restricted to domestic use as it is also sold to augment local income. The sale of fuelwood is probably the biggest threat to sustainable utilization of fuelwood and the forest. Therefore, this study recommends that alternatives sources of livelihood and energy be created, among other recommendations for resident communities that will reduce the frequency of harvest from the forest.

The Changing Face of Assistive Technology

2015 ◽  
pp. 2068-2076
Author(s):  
James R. Stachowiak
Keyword(s):  
Assistive Technology ◽  
Mobile Devices ◽  
Operating Systems ◽  
Mobile Technology ◽  
People With Disabilities ◽  
Cost Effective ◽  
Ease Of Use ◽  
The World ◽  
Computer Based ◽  
Access Information

Computer-based Assistive Technology (AT) has had a powerful effect on people with disabilities in the areas of reading, writing, communicating, and accessing information. One of the roadblocks for use has always been the expense of AT. Advancements in computing and mobile technology, however, are making some technology more readily available, accessible, and cost effective for people with disabilities. Computer operating systems, for example, now contain features to magnify screens for reading and in the entering of text. The mobile movement of smartphones, e-readers, and tablets has also been changing the way people with disabilities access information. The capabilities of these devices combined with the immediate availability, affordability, and ease of use, has been making the world more accessible for people with disabilities, and with mobile devices increasingly becoming a necessity for most, this trend is anticipated to only continue.

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