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Fluorescent Quantum Dots (fluorescent + quantum_dot)

Distribution by Scientific Domains

Polymers and Materials Science	50%

Selected Abstracts

Living Yeast Cells as a Controllable Biosynthesizer for Fluorescent Quantum Dots

ADVANCED FUNCTIONAL MATERIALS, Issue 15 2009
Ran Cui
Abstract There are currently some problems in the field of chemical synthesis, such as environmental impact, energy loss, and safety, that need to be tackled urgently. An interdisciplinary approach, based on different backgrounds, may succeed in solving these problems. Organisms can be chosen as potential platforms for materials fabrication, since biosystems are natural and highly efficient. Here, an example of how to solve some of these chemical problems through biology, namely, through a novel biological strategy of coupling intracellular irrelated biochemical reactions for controllable synthesis of multicolor CdSe quantum dots (QDs) using living yeast cells as a biosynthesizer, is demonstrated. The unique fluorescence properties of CdSe QDs can be utilized to directly and visually judge the biosynthesis phase to fully demonstrate this strategy. By such a method, CdSe QDs, emitting at a variety of single fluorescence wavelengths, can be intracellularly, controllably synthesized at just 30°C instead of at 300°C with combustible, explosive, and toxic organic reagents. This green biosynthetic route is a novel strategy of coupling, with biochemical reactions taking place irrelatedly, both in time and space. It involves a remarkable decrease in reaction temperature, from around 300 °C to 30 °C and excellent color controllability of CdSe photoluminescence. It is well known that to control the size of nanocrystals is a mojor challenge in the biosynthesis of high-quality nanomaterials. The present work demonstrates clearly that biological systems can be creatively utilized to realize controllable unnatural biosynthesis that normally does not exist, offering new insights for sustainable chemistry. [source]

GdIII -Functionalized Fluorescent Quantum Dots as Multimodal Imaging Probes,

ADVANCED MATERIALS, Issue 21 2006
H. Yang
Multimodal probes of GdIII -functionalized silica-coated CdS:Mn/ZnS quantum dots (see figure) that exhibit yellow fluorescence and strong paramagnetism are reported. High magnetic resonance imaging (MRI) contrast is exhibited by these quantum dots. These properties make for a probe that can operate in multiple modes, which is highly desirable for in,vivo bioimaging applications. [source]

Fluorescent Quantum Dots as Artificial Antennas for Enhanced Light Harvesting and Energy Transfer to Photosynthetic Reaction Centers,

ANGEWANDTE CHEMIE, Issue 40 2010
Prof. Igor Nabiev
Bio-Nano: Quantenpunkte (QDs) können mit photosynthetischen Reaktionszentren (RCs) so markiert werden (siehe Bild), dass der FRET vom QD zum RC eine annähernde Verdreifachung der Geschwindigkeit, in der Excitonen im RC erzeugt werden, zur Folge hat. Es werden sogar noch größere Verstärkungen vorhergesagt, was dafür spricht, dass solche Komplexe die Effizienz der Photosynthese erheblich steigern könnten. [source]

The biocompatibility microorganisms-carbon nanostructures for applications in microbial fuel cells

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 6 2007
A. Morozan
Abstract Bionanocomposites Staphylococcus aureus /carbon nanotubes were prepared and their biocompatibility with different species of carbon nanotubes (CNTs) evaluated in terms of their incorporation into a microbial fuel cell (MFC) anodic design. Multi wall carbon nanotubes (MWNTs) with various morphologies and structures, as received, and synthesized by the pyrolysis of novolac with ferrocene addition were used. MWNTs were characterized by TEM and FT-IR spectroscopy. Optical microscopy with fluorescent quantum dots (QDs) have been used for bio-labeling, microorganisms-CNTs biocompatibility and rapid identification of the colonies developed. Designed BNCs are good culture cells media and the electrodes based on synthesized CNTs could be used with good effects in MFCs, from the point of view of bacteria biocompatibility. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]