Biochemical and behavioural responses of the marine polychaete Hediste diversicolor to cadmium sulfide quantum dots (CdS QDs): Waterborne and dietary exposure

Chemosphere ◽  
2014 ◽  
Vol 100 ◽  
pp. 63-70 ◽  
Author(s):  
Pierre-Emmanuel Buffet ◽  
Laurence Poirier ◽  
Aurore Zalouk-Vergnoux ◽  
Christelle Lopes ◽  
Jean-Claude Amiard ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Sulfide ◽  
Dietary Exposure ◽  
Hediste Diversicolor ◽  
Behavioural Responses ◽  
Marine Polychaete ◽  
Cds Qds

scholarly journals Fluorescence modulation of cadmium sulfide quantum dots by azobenzene photochromic switches

2016 ◽  
Vol 472 (2186) ◽  
pp. 20150692 ◽  
Author(s):  
Hina Javed ◽  
Kalsoom Fatima ◽  
Zareen Akhter ◽  
Muhammad Arif Nadeem ◽  
Muhammad Siddiq ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Sulfide ◽  
Mercaptoacetic Acid ◽  
X Ray Diffraction ◽  
Photochromic Compounds ◽  
Lowest Unoccupied Molecular Orbital ◽  
Modified Surface ◽  
Fluorescence Modulation ◽  
Cds Qds ◽  
Surface Modified

We have investigated the attachment of azobenzene photochromic switches on the modified surface of cadmium sulfide (CdS) quantum dots (QDs). The modification of CdS QDs is done by varying the concentration of the capping agent (mercaptoacetic acid) and NH 3 in order to control the size of the QDs. The X-ray diffraction studies revealed that the crystallite size of CdS QDs ranged from 6 to 10 nm. The azobenzene photochromic derivatives bis(4-hydroxybenzene-1-azo)4,4′(1,1′ diphenylmethane) (I) and 4,4′-diazenyldibenzoic acid (II) were synthesized and attached with surface-modified CdS QDs to make fluorophore–photochrome CdS-(I) and CdS-(II) dyad assemblies. Upon UV irradiation, the photochromic compounds (I) and (II) undergo a reversible trans – cis isomerization. The photo-induced trans – cis transformation helps to transfer photo-excited electrons from the conduction band of the CdS QDs to the lowest unoccupied molecular orbital of cis isomer of photochromic compounds (I) and (II). As a result, the fluorescence of CdS-(I) and CdS-(II) dyads is suppressed approximately five times compared to bare CdS QDs. The fluorescence modulation in such systems could help to design luminescent probes for bioimaging applications.

In situ functionalization of self-assembled dendrimer nanofibers with cadmium sulfide quantum dots through simple ionic-substitution

2016 ◽  
Vol 40 (7) ◽  
pp. 6325-6331 ◽  
Author(s):  
V. Astachov ◽  
M. Garzoni ◽  
A. Danani ◽  
K.-L. Choy ◽  
G. M. Pavan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Sulfide ◽  
Simple Approach ◽  
Ionic Substitution ◽  
Cds Qds ◽  
Self Assembled ◽  
Poly Propylene ◽  
In Situ Functionalization

Cadmium sulfide quantum dots (CdS-QDs) can be generated along poly(propylene imine) (PPI) dendrimer-based self-assembled nanofibers through a simple approach based on ionic substitution.

Aged Fingermarks Detection with CdS/PAMAM Nanocomposites

2011 ◽  
Vol 282-283 ◽  
pp. 466-469 ◽  
Author(s):  
Yu Juan Jin ◽  
Yun Jun Luo ◽  
Guo Zhi Xu ◽  
Biao Yang
Keyword(s):  
Quantum Dots ◽  
Cadmium Sulfide ◽  
Pamam Dendrimers ◽  
Adhesive Tape ◽  
Yellow Luminescence ◽  
Ultraviolet Excitation ◽  
Nano Scale ◽  
Powder Suspension ◽  
Cds Qds

CdS(Cadmium sulfide)/PAMAM(polyamidoamine) Nanocomposites were in-situ prepared taking PAMAM dendrimers as stabilization in water. The prepared solution containing photoluminescent semiconductor CdS QDs(Quantum dots) was utilized for detection of aged fingermarks on adhesive tape strips. The fingermarks were aged for 1 d, 7 d and 30 d in nature light respectively. The results show that the latent aged fingermarks treated with CdS/PAMAM nanocomposites emit yellow luminescence under ultraviolet excitation of 365 nm in the dark. Aged fingermarks were detected successfully with better resolving rate comparing with existing nano-scale commercial TiO2powder suspension.

scholarly journals Comparative Analysis of Proteins Regulated during Cadmium Sulfide Quantum Dots Response in Arabidopsis thaliana Wild Type and Tolerant Mutants

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 615
Author(s):  
Valentina Gallo ◽  
Andrea Zappettini ◽  
Marco Villani ◽  
Nelson Marmiroli ◽  
Marta Marmiroli
Keyword(s):  
Quantum Dots ◽  
Arabidopsis Thaliana ◽  
Comparative Analysis ◽  
Cadmium Sulfide ◽  
Chlorophyll Biosynthesis ◽  
Response To Treatment ◽  
Transcriptional Elongation ◽  
Wild Type ◽  
Abiotic Stress Response ◽  
Cds Qds

In previous work, two independent Arabidopsis thaliana Ac/Ds transposon insertional mutant lines, atnp01 and atnp02, were identified that showed a higher level of tolerance than the wild type (wt) line to cadmium sulfide quantum dots (CdS QDs). The tolerance response was characterized at physiological, genetic and transcriptomic levels. In this work, a comparative analysis was performed on protein extracts from plantlets of the two mutants and of wt, each treated with 80 mg L−1 CdS QDs. A comparative protein analysis was performed by 2D-PAGE, and proteins were characterized by MALDI-TOF/TOF mass spectrometry. Of 250 proteins identified from all three lines, 98 showed significant changes in relative abundance between control and CdS QD-treated plantlets. The wt, atnp01, and atnp02 control-treated pairs respectively showed 61, 31, and 31 proteins with differential expression. The two mutants had a different response to treatment in terms of type and quantity of up- and downregulated proteins. This difference became more striking when compared to wt. A network analysis of the proteins differentially expressed in atnp01 and atnp02 included several of those encoded by putative genes accommodating the transposons, which were responsible for regulation of some proteins identified in this study. These included nifu-like protein 3 (Nfu3), involved in chloroplast assembly, elongator complex 3 (Elo3), involved in transcriptional elongation, magnesium-chelate subunit-2 (Chli2), involved in chlorophyll biosynthesis, and protein phosphatase 2C (PP2C) which mediates abiotic stress response.

scholarly journals Surface Modified Chitosan with Cadmium Sulfide Quantum Dots as Luminescent Probe for Detection of Silver Ions

2021 ◽  
Vol 33 (5) ◽  
pp. 1025-1030
Author(s):  
Chella Santhosh ◽  
R.S. Ernest Ravindran
Keyword(s):  
Quantum Dots ◽  
Cadmium Sulfide ◽  
Silver Ions ◽  
Aqueous Solubility ◽  
X Ray Diffraction ◽  
Modified Chitosan ◽  
Transmission Electron ◽  
Cds Qds ◽  
Surface Modified ◽  
Chitosan Composite

In present work, the surface modified cadmium sulfide quantum dots (CdS QDs) was synthesized with chitosan for the detection of silver ions. Chitosan was employed as matrix medium to fabricate CdS QDs, resulting in the formation of novel QDs/chitosan composite. The CdS quantum dots surface coated with chitosan were analyzed using UV-vis spectrophotometer, X-ray diffraction and transmission electron microscope. The chitosan + CdS QDs exhibited high aqueous solubility with better steadiness. By using chitosan + CdS, the silver ions were not only detected but also reduced to nanosize due to the reducing property of chitosan. The mechanism of fluorescence quenching of chitosan + CdS by Ag+ was investigated using photoluminescence spectroscopy.

Cadmium sulfide quantum dots anchored on reduced graphene oxide for the electrochemical detection of metronidazole

2021 ◽  
Vol 45 (6) ◽  
pp. 3022-3033
Author(s):  
Praveen Kumar Gopi ◽  
Ganesh Kesavan ◽  
Shen-Ming Chen ◽  
Chandan Hunsur Ravikumar
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Cadmium Sulfide ◽  
Reduced Graphene Oxide ◽  
Electrochemical Detection ◽  
Reduced Graphene ◽  
Metal Organic ◽  
Cds Qds

In this research, the metal–organic-based synthesis of cadmium sulfide quantum dots (CdS QDs) was performed.

scholarly journals Production of cadmium sulfide quantum dots by the lithobiontic Antarctic strain Pedobacter sp. UYP1 and their application as photosensitizer in solar cells

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
V. Carrasco ◽  
V. Amarelle ◽  
S. Lagos-Moraga ◽  
C. P. Quezada ◽  
R. Espinoza-González ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Cadmium Sulfide ◽  
Uv Light ◽  
Short Circuit ◽  
Open Circuit ◽  
Spectroscopic Techniques ◽  
Bacterial Strains ◽  
Fildes Peninsula ◽  
Cds Qds

Abstract Background Microbes are present in almost every environment on Earth, even in those with extreme environmental conditions such as Antarctica, where rocks may represent the main refuge for life. Lithobiontic communities are composed of microorganisms capable of colonizing rocks and, as it is a not so well studied bacterial community, they may represent a very interesting source of diversity and functional traits with potential for biotechnological applications. In this work we analyzed the ability of Antarctic lithobiontic bacterium to synthesize cadmium sulfide quantum dots (CdS QDs) and their potential application in solar cells. Results A basaltic andesite rock sample was collected from Fildes Peninsula, King George Island, Antarctica, and processed in order to isolate lithobiontic bacterial strains. Out of the 11 selected isolates, strain UYP1, identified as Pedobacter, was chosen for further characterization and analysis due to its high cadmium tolerance. A protocol for the biosynthesis of CdS QDs was developed and optimized for this strain. After 20 and 80 min of synthesis, yellow-green and orange-red fluorescent emissions were observed under UV light, respectively. QDs were characterized through spectroscopic techniques, dynamic light scattering analysis, high-resolution transmission electron microscopy and energy dispersive x-ray spectroscopy. Nanostructures of 3.07 nm, composed of 51.1% cadmium and 48.9% sulfide were obtained and further used as photosensitizer material in solar cells. These solar cells were able to conduct electrons and displayed an open circuit voltage of 162 mV, a short circuit current density of 0.0110 mA cm−2, and had an efficiency of conversion up to 0.0016%, which is comparable with data previously reported for solar cells sensitized with biologically produced quantum dots. Conclusions We report a cheap, rapid and eco-friendly protocol for the production of CdS QDs by an Antarctic lithobiontic bacterium, Pedobacter, a genus that was not previously reported as a quantum dot producer. The application of the biosynthesized QDs as sensitizer material in solar cells was validated.

Cadmium sulfide quantum dots stabilized by aromatic amino acids for visible light-induced photocatalytic degradation of organic dyes

2015 ◽  
Vol 39 (9) ◽  
pp. 6951-6957 ◽  
Author(s):  
Jie Zhang ◽  
Yuming Guo ◽  
Hui Fang ◽  
Weili Jia ◽  
Han Li ◽  
...  
Keyword(s):  
Amino Acids ◽  
Quantum Dots ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Cadmium Sulfide ◽  
Hydroxyl Radicals ◽  
Visible Light Irradiation ◽  
Organic Dyes ◽  
Aromatic Amino Acids ◽  
Cds Qds

CdS QDs stabilized by aromatic amino acids photocatalytically degrade organic dyes under visible light irradiation through mediation of hydroxyl radicals.

Monitoring pyrophosphate anions via cobalt(ii)-modulated fluorescence of cadmium sulfide quantum dots

2016 ◽  
Vol 8 (10) ◽  
pp. 2170-2175 ◽  
Author(s):  
Jin-Xia Liu ◽  
Shou-Nian Ding
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Cadmium Sulfide ◽  
Fluorescent Sensor ◽  
Fluorescence Recovery ◽  
Turn On ◽  
Modulated Fluorescence ◽  
Cds Qds

An off–on fluorescent sensor for pyrophosphate (PPi) is established based on the fluorescence quenching of CdS QDs in the presence of Co2+(turn-off) and the fluorescence recovery (turn-on) by the continuous addition of PPi.

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