Highly sensitive and cost-effective metal-semiconductor-metal asymmetric type Schottky metallization based ultraviolet photodetecting sensors fabricated on n-type GaN

2022 ◽  
Vol 138 ◽  
pp. 106297
Author(s):  
Nanda Kumar Reddy Nallabala ◽  
S.V. Prabhakar Vattikuti ◽  
V.K. Verma ◽  
V.R. Singh ◽  
Salh Alhammadi ◽  
...  
Keyword(s):  
Cost Effective ◽  
Metal Semiconductor Metal ◽  
Highly Sensitive

scholarly journals Electrochemical Biosensors in Food Safety: Challenges and Perspectives

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2940
Author(s):  
Antonella Curulli
Keyword(s):  
Food Industry ◽  
Electrochemical Sensors ◽  
Cost Effective ◽  
Electrochemical Biosensors ◽  
Food Chains ◽  
Sensing Systems ◽  
Highly Sensitive ◽  
Skilled Personnel ◽  
Recent Developments ◽  
Key Issues

Safety and quality are key issues for the food industry. Consequently, there is growing demand to preserve the food chain and products against substances toxic, harmful to human health, such as contaminants, allergens, toxins, or pathogens. For this reason, it is mandatory to develop highly sensitive, reliable, rapid, and cost-effective sensing systems/devices, such as electrochemical sensors/biosensors. Generally, conventional techniques are limited by long analyses, expensive and complex procedures, and skilled personnel. Therefore, developing performant electrochemical biosensors can significantly support the screening of food chains and products. Here, we report some of the recent developments in this area and analyze the contributions produced by electrochemical biosensors in food screening and their challenges.

Computerized color perimetry in multiple sclerosis

1998 ◽  
Vol 4 (2) ◽  
pp. 79-84 ◽  
Author(s):  
N Accornero ◽  
S Rinalduzzi ◽  
M Capozza ◽  
E Millefiorini ◽  
G C Filligoi ◽  
...  
Keyword(s):  
Visual Field ◽  
Statistical Difference ◽  
Cost Effective ◽  
Quantitative Information ◽  
Field Analysis ◽  
Visual Field Defects ◽  
Highly Sensitive ◽  
The Subject ◽  
Color Perimetry ◽  
Field Defects

Color visual field analysis has proven highly sensitive for early visual impairments diagnosis in MS, yet it has never attained widespread popularity usually because the procedure is difficult to standardize, the devices are costly, and the test is fatiguing. We propose a computerized procedure running on standard PC, cost effective, clonable, and easy handled. Two hundred and sixty-four colored patches subtending 18 angle of vision, with selected hues and low saturation levels are sequentially and randomly displayed on gray equiluminous background of the PC screen subtending 2486408 angle of vision. The subject is requested to press a switch at the perception of the stimulus. The output provides colored maps with quantitative information. Comparison between normals and a selected population of MS patients with no actual luminance visual field defects, showed high statistical difference.

scholarly journals Improved Refractive Index Sensitivity Utilizing Long-Period Gratings with Periodic Corrugations on Cladding

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Anthony Lim ◽  
Wen Bin Ji ◽  
Swee Chuan Tjin
Keyword(s):  
Refractive Index ◽  
Cost Effective ◽  
Experimental Results ◽  
Refractive Index Sensitivity ◽  
Long Period ◽  
Specimen Collection ◽  
Long Period Gratings ◽  
Highly Sensitive ◽  
Index Sensitivity

A new structure of Long-Period Gratings (LPGs) sensor is introduced as a sensitive ambient RI sensor. This structure consists of creating periodic corrugations on the cladding of the LPG. The experimental results show that this LPG structure has good performances in terms of linearity and sensitivity and serves as a highly sensitive and cost-effective sensor. It also has the advantage of portability as the corrugation can also serve as the reservoir for the specimen collection to be tested.

Development of a highly sensitive and selective spectrophotometric method for the determination of carvedilol in pharmaceutical and urine samples

RSC Advances ◽  
2014 ◽  
Vol 4 (77) ◽  
pp. 40816-40823
Author(s):  
Masoud Shariati-Rad ◽  
Mohsen Irandoust ◽  
Sara Sheikhi
Keyword(s):  
Spectrophotometric Method ◽  
Cost Effective ◽  
Urine Samples ◽  
Highly Sensitive

A simple, sensitive, selective, accurate and cost-effective spectrophotometric method for the determination of CAR in pharmaceutical and urine samples was developed.

scholarly journals Saline collection media and an extraction free workflow enables massively scalable, highly sensitive, and cost-effective SARS-CoV-2 testing

2020 ◽  
Author(s):  
Yan Wei Lim ◽  
Nicole Leonetti ◽  
Aakash Amin ◽  
Henrique Machado ◽  
Natasha Bonilla ◽  
...  
Keyword(s):  
Supply Chain ◽  
Sensitivity And Specificity ◽  
Limit Of Detection ◽  
Rna Extraction ◽  
Cost Effective ◽  
Scaling Up ◽  
Consumption Patterns ◽  
Highly Sensitive ◽  
Processing Steps

Abstract The challenges in scaling up SARS-CoV-2 testing capacity include shortages in the supply chain for consumables and reagents. Improvements in consumption patterns can be obtained through removal of key processing steps, including RNA extraction. Here, we present a scalable and validated extraction-free method for the detection of SARS-CoV-2 from swab specimens in saline, with a limit of detection at 1,000 GCE/mL and a sensitivity and specificity of 100%.

The Modified Telephone-Administered Minnesota Cognitive Acuity Screen for Mild Cognitive Impairment

2018 ◽  
Vol 31 (3) ◽  
pp. 123-128 ◽  
Author(s):  
Sarah Pillemer ◽  
George D. Papandonatos ◽  
Cara Crook ◽  
Brian R. Ott ◽  
Geoffrey Tremont
Keyword(s):  
Cognitive Impairment ◽  
Mild Cognitive Impairment ◽  
Characteristic Curve ◽  
Neuropsychological Testing ◽  
Cost Effective ◽  
Original Version ◽  
Modest Improvement ◽  
Highly Sensitive ◽  
Risk Of Progression ◽  
Administration Time

Objective: This study aimed to compare the sensitivity and specificity of a modified version of the Minnesota Cognitive Acuity Screen (MCAS-m), by adding learning and recognition memory components, to the original version MCAS to distinguish amnestic mild cognitive impairment (aMCI) from healthy controls (HCs). Methods/Design: A total of 30 individuals with aMCI and 30 HCs underwent neuropsychological testing, neurologic examination, laboratory, and brain imaging tests. Once diagnosis was confirmed, participants completed the MCAS and MCAS-m in counterbalanced order. Results: The average administration time was 12.6 minutes for the MCAS and 13.5 minutes for the MCAS-m. Receiver operating characteristic curve analyses showed that the MCAS-m demonstrated 97% sensitivity and 97% specificity for distinguishing between aMCI and HC versus 97% and 87%, respectively, for the original MCAS in this sample. Conclusions: Both the MCAS and the MCAS-m were highly sensitive when distinguishing between normal cognition and aMCI; however, the MCAS-m demonstrated a 10% increase in specificity compared to the original version. Improved specificity is particularly relevant to screening in larger community samples with lower base rates of MCI than clinic populations. This modified screening measure presents a brief and cost-effective tool for identifying MCI. Given the risk of progression from aMCI to Alzheimer disease dementia (AD), the MCAS-m represents a modest improvement in telephone-administered methods for the early detection of AD.

Ultrasensitive surface-enhanced Raman scattering detection of urea by highly ordered Au/Cu hybrid nanostructure arrays

2017 ◽  
Vol 53 (56) ◽  
pp. 7949-7952 ◽  
Author(s):  
Kun Chen ◽  
Xinyi Zhang ◽  
Douglas R. MacFarlane
Keyword(s):  
Raman Scattering ◽  
Cost Effective ◽  
Surface Enhanced Raman Scattering ◽  
Simple Approach ◽  
Hybrid Nanostructure ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Nanostructure Arrays ◽  
Enhanced Raman Scattering

We report a simple approach to fabricate cost-effective and highly sensitive surface-enhanced Raman scattering substrates based on Au/Cu hybrid nanostructure arrays for the detection of urea, an important molecule in biological and medical fields.

A Squaraine Derivative for Cost-Effective, Quick, and Highly Sensitive Determination of Mercury and Thiols and pH Sensing

ChemPlusChem ◽  
2016 ◽  
Vol 81 (9) ◽  
pp. 913-916 ◽  
Author(s):  
Alexandros A. Sklavounos ◽  
Eleftherios K. Pefkianakis ◽  
Dimitra K. Toubanaki ◽  
Georgios C. Vougioukalakis ◽  
Antony C. Calokerinos
Keyword(s):  
Cost Effective ◽  
Ph Sensing ◽  
Highly Sensitive ◽  
Sensitive Determination

scholarly journals Spectrophotometric determination of sotalol in tablets

2018 ◽  
pp. 49-55
Author(s):  
Y. M. Zhuk ◽  
S. O. Vasyuk
Keyword(s):  
Quantitative Determination ◽  
Room Temperature ◽  
Cost Effective ◽  
Pharmaceutical Formulations ◽  
Molar Absorptivity ◽  
Pharmaceutical Drugs ◽  
Analysis Method ◽  
Highly Sensitive ◽  
Colored Product

In this investigation a visible spectrophotometric method for the determination of sotalol based on the absorbance of colored product of the reaction between sotalol hydrochloride and bromcresol purple in acetone medium at 399 nm measurement was developed. The optimal conditions for the quantitative determination of sotalol hydrochloride in the content of pharmaceutical drugs were established. The stoichiometric relationship coefficients between sotalol hydrochloride and bromcresol purple were determined. The validation of the worked out procedure on such validated characteristics as linearity, precision, accuracy and robustness was carried out. The aim. To develop a highly sensitive, easy to use, cost-effective and valid method for quantitative determination of sotalol hydrochloride in dosage forms. The analysis method. Visible spectrophotometry. The analytical parameters such as molar absorptivity, Beer’s law limits and Sandell’s sensitivity values were calculated. The developed methods give the result with repeatability sufficient for dependable determination the investigated substance in pharmaceutical formulations. Accuracy established by analyte addition technique. Determined factors that influence on the absorbance value: reagent quantity and timing stability. Sample solutions stable during 30 min. Addition to sample solution ± 10% bromcresol purple solution is not change the absorbance value. Established that reaction between sotalol hydrochloride and bromcresol purple proceeds in acetone medium at room temperature. Molar absorption coefficient is 2,62∙103.

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