scholarly journals UV Blocking Glass: Low Cost Filters for Visible Light Photocatalytic Assessment

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Charles W. Dunnill
Keyword(s):  
Visible Light ◽  
Light Transmission ◽  
Uv Light ◽  
Low Cost ◽  
False Negative ◽  
Double Layers ◽  
Uv Blocking ◽  
Negative Results ◽  
Light Activity ◽  
Visible Light Photocatalytic

A number of commercially available art protection products have been compared and assessed for their suitability as UV blocking filters in the application of “visible light” photocatalytic research. Many groups claiming visible light photocatalytic success employ filters to block out stray UV radiation in order to justify that their photocatalysts are indeed visible light photocatalysts and not UV light photocatalysts. These filters come in varying degrees of ability and price and many authors fail to correctly characterise their filters in individual papers. The use of effective filters to prevent both false positive and false negative results is important to maintain scientific rigor and create accurate understanding of the subject. The optimum UV filter would have the highest UV blocking properties (<390 nm) and simultaneously the highest visible light transmission (390–750 nm). Single and double layers of each of the glass products were assessed as well as laminate products. The conclusions show an inexpensive and highly effective setup for the conduction of visible light photochemistry that should be incorporated as a standard part in any researcher’s work where the claim of visible light activity is made.

scholarly journals Visible light photocatalytic activity of TiO2 deposited on activated carbon

2013 ◽  
Vol 11 (3) ◽  
pp. 464-470 ◽  
Author(s):  
Alexander Eliyas ◽  
Ljutzkan Ljutzkanov ◽  
Irina Stambolova ◽  
Vladimir Blaskov ◽  
Sasho Vassilev ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Activated Carbon ◽  
Visible Light ◽  
Uv Light ◽  
Original Method ◽  
Light Illumination ◽  
Porous Texture ◽  
Visible Light Photocatalytic Activity ◽  
Light Activity ◽  
Visible Light Photocatalytic

AbstractAbstract Four photocatalyst samples, prepared from beech sawdust, were synthesized by an original method, combining pyrolysis and impregnation — two of them: TiO2 + activated carbon and other two — only activated carbon. The pyrolysis process has been carried out at two different temperatures — 680°C and 830°C. The prepared samples were characterized by a series of methods — XRD, BET, SEM and DTA/TG. The most important result was achieving visible light photocatalytic activity with an azo dye pollutant for both materials. The TiO2/AC-680°C sample demonstrated higher activity under visible light illumination than the TiO2/AC-830°C sample. The visible light activity was attributed to the active carbon component in the composite materials, which was evidenced by the photocatalytic tests with bare carbon (without any TiO2) manifesting visible light activity. The AC-680°C carbon was superior to the AC-830°C under visible illumination probably due to its higher specific surface area and porous texture. UV-light testing of the photocatalytic activity revealed that the TiO2/AC-680°C sample was higher than that of the TiO2/AC-830°C under polychromatic UV-A illumination (320–400 nm with a maximum at l = 365 nm). The TiO2/AC-680°C sample was also more efficient with the monochromatic UV-C illumination (l = 254 nm). Graphical abstract

scholarly journals Visible-Light Photocatalytic Degradation of Aniline Blue by Stainless-Steel Foam Coated with TiO2 Grafted with Anthocyanins from a Maqui-Blackberry System

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1245
Author(s):  
Dreidy Vásquez ◽  
Francisca Palominos ◽  
Sebastián Martínez
Keyword(s):  
Stainless Steel ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Uv Light ◽  
Low Cost ◽  
Aniline Blue ◽  
Anthocyanin Content ◽  
High Frequency Ultrasound ◽  
Total Anthocyanin ◽  
Visible Light Photocatalytic

Anthocyanins from maqui (Aristotelia chilensis) and blackberry (Rubus glaucus) were used as light harvesters to improve the photocatalytic activity of titanium dioxide in visible light. Anthocyanins from both species were obtained using high-frequency ultrasound-assisted liquid-liquid extraction with methanol. Mixtures of anthocyanins were developed to study their effectiveness in the visible light/TiO2 reaction for the oxidation of aniline blue. For this purpose, stainless-steel foams were covered with TiO2 and anthocyanin and characterized by SEM. Different samples were fabricated by varying the ratio of the two anthocyanins in the mixture (100, 75, 50, 25 and 0 vol% of maqui-anthocyanin (delphinidin)). The mixtures of 25 vol% anthocyanin from maqui and 75 vol% anthocyanin from blackberry had higher total anthocyanin content and better photocatalytic activity in visible light: degradation of aniline blue was 40% at pH 7, 56% at pH 3 and 95% at pH 3 with the injection of oxygen for 2 h in comparison with TiO2-foam/UV light, which yielded values of 13% at pH 7 and 73% at pH 3 with and without the addition of oxygen. Natural dyes that are low-cost and environmentally friendly substances are shown to be capable of improving the visible-light photocatalytic activity of TiO2.

Transparent thin films of Cu–TiO2 with visible light photocatalytic activity

2015 ◽  
Vol 14 (3) ◽  
pp. 591-596 ◽  
Author(s):  
Marcin Janczarek ◽  
Anna Zielińska-Jurek ◽  
Irmina Markowska ◽  
Jan Hupka
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Visible Light ◽  
Low Cost ◽  
Dip Coating ◽  
High Transparency ◽  
Light Activity ◽  
Coating Method ◽  
Dip Coating Method ◽  
Visible Light Photocatalytic

Thin films of Cu–TiO2 with high transparency were prepared using a low-cost dip-coating method. The visible light activity of Cu–TiO2 in the aqueous solution was confirmed in relation to model organic compounds.

scholarly journals Novel N-doped ZrO2 with enhanced visible-light photocatalytic activity for hydrogen production and degradation of organic dyes

RSC Advances ◽  
2018 ◽  
Vol 8 (13) ◽  
pp. 6752-6758 ◽  
Author(s):  
Yuanyang Wang ◽  
Yinghua Zhang ◽  
Haiqiang Lu ◽  
Yanxin Chen ◽  
Zhenmin Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Visible Light ◽  
Nitrogen Source ◽  
Organic Dyes ◽  
Low Cost ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Visible Light Photocatalytic

Two new types of N-doped ZrO2 photocatalysts ZON and AZON have been synthesized using ethylenediamine as the nitrogen source by a facile and low-cost sol–gel method.

Photocatalytic properties of Bi/BiOCl heterojunctions synthesized using an in situ reduction method

2014 ◽  
Vol 38 (10) ◽  
pp. 4913-4921 ◽  
Author(s):  
Jiajia Hu ◽  
Guangqing Xu ◽  
Jinwen Wang ◽  
Jun Lv ◽  
Xinyi Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Reduction Method ◽  
Uv Light ◽  
Photocatalytic Properties ◽  
In Situ Reduction ◽  
Light Activity ◽  
Bi Nanoparticles

Bi nanoparticles on BiOCl nanosheets, synthesized via in situ reduction, enhance the UV light photocatalytic activity and achieve visible light activity.

scholarly journals A Rapid and Low-Cost protocol for the detection of B.1.1.7 lineage of SARS-CoV-2 by using SYBR Green-Based RT-qPCR

2021 ◽  
Author(s):  
Fadi Abdel Sater ◽  
Mahmoud Younes ◽  
Hassan Nassar ◽  
Paul Nguewa ◽  
Kassem Hamze
Keyword(s):  
Low Cost ◽  
False Negative ◽  
Sybr Green ◽  
Reproductive Number ◽  
Rt Pcr ◽  
Negative Results ◽  
False Negative Results ◽  
New Variant ◽  
Primer Sets ◽  
The Uk

AbstractBackgroundThe new SARS-CoV-2 variant VUI (202012/01), identified recently in the United Kingdom (UK), exhibits a higher transmissibility rate compared to other variants, and a reproductive number 0.4 higher. In the UK, scientists were able to identify the increase of this new variant through the rise of false negative results for the spike (S) target using a three-target RT-PCR assay (TaqPath kit).MethodsTo control and study the current coronavirus pandemic, it is important to develop a rapid and low-cost molecular test to identify the aforementioned variant. In this work, we designed primer sets specific to SARS-CoV-2 variant VUI (202012/01) to be used by SYBR Green-based RT-PCR. These primers were specifically designed to confirm the deletion mutations Δ69/Δ70 in the spike and the Δ106/Δ107/Δ108 in the NSP6 gene. We studied 20 samples from positive patients, 16 samples displayed an S-negative profile (negative for S target and positive for N and ORF1ab targets) and four samples with S, N and ORF1ab positive profile.ResultsOur results emphasized that all S-negative samples harbored the mutations Δ69/Δ70 and Δ106/Δ107/Δ108. This protocol could be used as a second test to confirm the diagnosis in patients who were already positive to COVID-19 but showed false negative results for S-gene.ConclusionsThis technique may allow to identify patients carrying the VUI (202012/01) variant or a closely related variant, in case of shortage in sequencing.

Monochrome LightCycler PCR assay for detection and quantification of five common species of Candida and Aspergillus

2005 ◽  
Vol 54 (3) ◽  
pp. 243-248 ◽  
Author(s):  
Rong Bu ◽  
Rajeev K Sathiapalan ◽  
Muna M Ibrahim ◽  
Ibrahim Al-Mohsen ◽  
Edna Almodavar ◽  
...  
Keyword(s):  
Genomic Dna ◽  
Fungal Pathogens ◽  
Low Cost ◽  
False Negative ◽  
Common Species ◽  
Fungal Species ◽  
Clinical Samples ◽  
Pcr Assay ◽  
Negative Results ◽  
Identification And Quantification

Invasive fungal pathogens, especially in immunocompromised hosts, can result in life-threatening infections. Current laboratory/radiological methods for fungal identification are time-consuming and lack sensitivity and specificity. A monochrome, multiplex, real-time PCR assay for the identification and quantification of Candida albicans, Candida krusei, Candida tropicalis, Aspergillus flavus and Aspergillus fumigatus is described here. Detection of each of these fungi was specific and demonstrated 100 % concordance with biochemical/culture identification in all 60 isolates tested. Samples from 16 febrile neutropenic patients with haematological malignancies were also analysed and the utility of the assay in clinical samples was reconfirmed without false-negative results. The sensitivity of this assay was 0.1 pg fungal genomic DNA, corresponding to three cells, for C. albicans, C. krusei, C. tropicalis and A. flavus, and 0.01 pg fungal genomic DNA, i.e. less than one cell, for A. fumigatus. The analysis allows a low-cost, simple, rapid and sensitive alternative for clinical identification and quantification of these five common fungal species.

Utilization of Fluorogenic Assay for Rapid Detection of Escherichia coli in Acidic Fruit Juice

2002 ◽  
Vol 65 (12) ◽  
pp. 1943-1948 ◽  
Author(s):  
STEVEN PAO ◽  
CRAIG L. DAVIS ◽  
LORETTA M. FRIEDRICH ◽  
MICKEY E. PARISH
Keyword(s):  
Escherichia Coli ◽  
Fruit Juice ◽  
Uv Light ◽  
False Negative ◽  
Enzyme Reaction ◽  
Inhibitory Effect ◽  
Sample Sizes ◽  
Citrus Juice ◽  
Negative Results ◽  
False Negative Results

This study was undertaken to investigate interference by acids commonly found in fruit juice in Escherichia coli assays involving the use of 4-methylumbelliferyl-β-d-glucuronide (MUG) as a fluorogenic substrate for enzyme reaction. Fluorescence intensity was negatively correlated (P &lt; 0.001) with the volume of fresh citrus juice tested by the lauryl tryptose broth (LST)-MUG assay, and the permissible sample sizes were limited to 0.3 and 0.5 ml for fresh citrus juices with pHs of 3.3 and 3.9, respectively. In addition, false-negative results were visually observed under UV light when the E*Colite assay was used to test large volumes (5 to 10 ml per test) of fresh citrus juice or when the test broth used for the LST-MUG assay was supplemented with citric, malic, or tartaric acid at 2 to 4 g/liter. These results suggest that the size and pH of acidic samples should be controlled in MUG-based fluorogenic assays. The inhibitory effect on fluorescence was due to high acidity, which reduces fluorescence from 4-methylumbelliferone. Buffering improved the assays. When sodium bicarbonate was incorporated in the enrichment broth at 10 g/liter, the permissible sample sizes for fresh grapefruit juice (pH 3.1) increased from 0.3 to 1 ml for the LST-MUG (with 9.9 ml of broth) assay and from 3 to 10 ml for the E*Colite (with 99 ml of broth) assay.

Facile synthesis of NiS2 nanoparticles ingrained in a sulfur-doped carbon nitride framework with enhanced visible light photocatalytic activity: two functional roles of thiourea

2018 ◽  
Vol 6 (27) ◽  
pp. 13448-13466 ◽  
Author(s):  
Milad Jourshabani ◽  
Zahra Shariatinia ◽  
Gopal Achari ◽  
Cooper H. Langford ◽  
Alireza Badiei
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Carbon Nitride ◽  
Low Cost ◽  
Facile Synthesis ◽  
Functional Roles ◽  
Cost Strategy ◽  
One Step ◽  
Low Cost Strategy ◽  
Visible Light Photocatalytic

A one-step, simple and low-cost strategy was successfully used to produce novel NiS2/S-doped g-C3N4 photocatalysts.

Role and limits of testicular phleboscintigraphy in the diagnostic evaluation of varicocele

1994 ◽  
Vol 61 (2) ◽  
pp. 98-102
Author(s):  
A. Raimoldi ◽  
G.L. Berti ◽  
V. Giola ◽  
G.L. Leidi ◽  
A. Maccaroni ◽  
...  
Keyword(s):  
Doppler Ultrasonography ◽  
Low Cost ◽  
False Negative ◽  
High Sensitivity ◽  
Diagnostic Evaluation ◽  
Ultrasound Technique ◽  
Negative Results ◽  
False Negative Results ◽  
First Choice ◽  
Choice Method

The Authors wanted to check the reliability of testicular phleboscintigraphy in the diagnostic evaluation of varicocele, comparing it to Doppler ultrasonography. To this end, 98 patients affected by clinically evident left idiopathic varicocele were tested. The two methods gave equivalent results in all patients affected by 2nd and 3rd clinical degree varicocele, while testicular phleboscintigraphy gave false negative results in 7 patients with 1st degree varicocele, due to renospermatic retrograde flow. Therefore, in the Authors' opinion, the Doppler ultrasound technique can be considered as a first choice method in the study of varicocele, thanks to its high sensitivity associated with low cost, whereas testicular phleboscintigraphy can be used either when Doppler ultrasonography evaluation is not reliable or as a second examination to confirm the Doppler results, especially in patients with 2nd and 3rd clinical degree varicocele.

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