Download or read book Experimental Investigation of Fluorescence Resonance Energy Transfer Using Quantum Dots written by Ee Zhuan Chong and published by . This book was released on 2007 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Terbium based Time gated F rster Resonance Energy Transfer Imaging for Evaluating Protein protein Interactions on Cell Membranes written by Stina Linden and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates the use of time-gated FRET microscopy for detection of colocalization of two membrane proteins, E- and N-cadherin. These proteins are important for cell-cell contacts and have an important role in the epithelial to mesenchymal transition (EMT), a key process in cancer metastasis. In EMT cells lose their epithelial markers (such as E-cadherin) and gain mesenchymal markers (such as N-cadherin), increasing their motility and invasiveness, enabling escape from the primary tumor into the bloodstream as so called circulating tumor cells (CTCs). This manuscript focuses on the detection of CTCs that have undergone partial EMT, displaying a hybrid phenotype (epithelial-mesenchymal) and co-express E- and N-cadherin, by FRET co-localization studies on a model cell line. FRET (Förster resonance energy transfer) is a non-radiative energy transfer between two molecules that are in resonance and in close proximity (ca. 1-20 nm). A co-localization of E- and N-cadherin in clusters would therefore be detectable by FRET. The staining of the cadherins was done by using specific antibodies labelled with a long lifetime donor, the terbium complex Lumi4-Tb (TbL4) from Lumiphore, Inc., and various acceptors. The long lifetime donor and long lifetime sensitized acceptor emission (FRET) could be imaged in a time-gated microscopy setup. Time -gated imaging has several advantages compared to steady state imaging in terms of efficient background suppression in biological samples. The setup described in this manuscript is based on the use of an intensified CCD camera, a pulsed UV-laser excitation source, and a defined (μs) delay between excitation and image acquisition. In addition to the E- and N-cadherin FRET experiments the time-gated FRET imaging microscopy was used to investigate different biological samples (intracellular and membrane located). Although both protein markers could be successfully imaged on the same cells, FRET between E- and N-cadherin or E- and E-cadherin could not be detected. Control experiments with antibodies against the same primary antibody revealed strong time-gated FRET signals due to binding of both donor and acceptor antibodies to the same primary antibodies. The successful time-gated imaging of two different antibodies separated by a few nanometers demonstrates the feasibility of probing protein-protein interaction and co-localization at membranes using TbL4 based time-gated FRET imaging. Microsecond time-gated imaging is especially interesting for the investigation of protein-protein interactions in highly autofluorescent biological samples such as cancer tissues.

Download or read book Quantum Dots for DNA Biosensing written by Jun-Jie Zhu and published by Springer Science & Business Media. This book was released on 2013-12-04 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a broad introduction to all major aspects of quantum dot properties including fluorescence, electrochemical, photochemical and electroluminescence. Such properties have been produced for applications in biosensing, cell tracking, in vivo animal imaging and so on. It focuses on their special applications in DNA biosensing and provides readers with detailed information on the preparation and functionalization of quantum dots and the fabrication of DNA biosensors, using examples to show how these properties can be used in DNA biosensor design and the advantages of quantum dots in DNA biosensing. Further new emerging quantum dots such as metal nanoclusters and graphene dots and their applications in DNA biosensing have also been included.

Download or read book Towards the Development of Techniques to Facilitate the Assembly and Characterization of Quantum Dot Gold Nanoparticle Complexes for Resonance Energy Transfer Based Assays written by Uvaraj Uddayasankar and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Resonance energy transfer between quantum dots and gold nanoparticles represents one of the most popular transduction schemes for biosensors using multi-nanoparticle complexes. This thesis investigates the influence of quantum dot positioning, relative to the gold nanoparticle, on the analytical performance of these assays. Stoichiometric assembly of the quantum dot-gold nanoparticle complexes required accurate knowledge of the quantum dot concentration. A technique was developed to quantify the molar concentration of nanoparticles in solution. This technique relied on the quantitative analysis of the statistical distribution of nanoparticle-ligand conjugates that form when nanoparticles are functionalized with small equivalents of ligand. The technique was successfully validated using gold nanoparticles, and was subsequently applied to determine the concentration of the alloy quantum dots. The precise positioning of the quantum dots relative to the gold nanoparticles required monovalent conjugates of the quantum dots. These were prepared using a magnetic bead based technique where positively charged magnetic beads were used to capture and selectively isolate the monovalent quantum dot-DNA conjugates. Successful isolation of monovalent conjugates was confirmed using single molecule fluorescence spectroscopy and the monovalent conjugates were found to retain their activity as determined using quantitative hybridization assays. Optimizing the quantum dot-gold nanoparticle assay required the investigation of two different configurations of nanoparticle arrangement. The first involved arranging quantum dots around a gold nanoparticle core, while the second involved arranging gold nanoparticles around a quantum dot core. The first configuration was found to have optimal analytical performance, as evaluated using quenching efficiencies and influence of inner filter effect. The ability to arrange multiple quantum dots around a single large gold nanoparticle minimized the negative influence of the inner filter effect, while the high quenching efficiency ensured high responses to target hybridization.

Download or read book Application of Quantum Dots in Biology and Medicine written by Puspendu Barik and published by Springer Nature. This book was released on 2022-10-03 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book illustrates various applications of quantum dots (QDs) in the biomedical field and future perspectives. It first introduces the synthesis procedures and fundamental properties of QDs. In addition, the optical detection techniques and toxicologic reviews of QDs are presented. A focus of the book is also on the applications of QDs in cancer therapy, drug delivery, bio-sensing, and targeted molecular therapy. This book is exciting and valuable to a wide variety of readership communities (students, early-stage researchers, and scientists) in the various fields of biology and medicine.

Download or read book Bright Compact and Biocompatible Quantum Dot rod Bioconjugates for F rster Resonance Energy Transfer Based Ratiometric Biosensing and Cellular Imaging written by Weili Wang and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Colloidal Quantum Dots for Biomedical Applications written by Kenji Yamamoto and published by SPIE-International Society for Optical Engineering. This book was released on 2006 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.

Download or read book Towards The Development Of A Quantum Dot Based Bioprobe For Intracellular Investigations of Nucleic Acid Hybridization Events Using Fluorescence Resonance Energy Transfer written by Lori Lok-Yin Chong and published by . This book was released on 2011 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: The unique spectroscopic properties of quantum dots (QDs) are of interest for application in intracellular studies of gene expression. QDs derivatized with single-stranded probe oligonucleotides were used to detect complementary target sequences via hybridization and fluorescence resonance energy transfer (FRET). As nucleic acid targets are not labeled within cells, a displacement assay for nucleic acid detection featuring QDs as FRET donors was developed. QDs conjugated with oligonucleotide probes and then pre-hybridized with labeled target yielded efficient FRET in vitro. Studies in vitro confirmed that displacement kinetics of pre-hybridized target was a function of the stability of the initial hybridized complex. Displacement was observed as reduction in FRET intensity coupled with regeneration of QD fluorescence. By engineering the sequence of the labeled target, faster displacement was possible. The QD-probe+target system was successfully delivered into cells via transfection. Although QDs with their cargo remained sequestered in endosomal vesicles, fluorescent properties were retained.

Download or read book Quantum Dots written by Ameenah Al-Ahmadi and published by IntechOpen. This book was released on 2012-04-04 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book “Quantum dots: A variety of a new applications” provides some collections of practical applications of quantum dots. This book is divided into four sections. In section 1 a review of the thermo-optical characterization of CdSe/ZnS core-shell nanocrystal solutions was performed. The Thermal Lens (TL) technique was used, and the thermal self-phase Modulation (TSPM) technique was adopted as the simplest alternative method. Section 2 includes five chapters where novel optical and lasing application are discussed. In section 3 four examples of quantum dot system for different applications in electronics are given. Section 4 provides three examples of using quantum dot system for biological applications. This is a collaborative book sharing and providing fundamental research such as the one conducted in Physics, Chemistry, Biology, Material Science, Medicine with a base text that could serve as a reference in research by presenting up-to-date research work on the field of quantum dot systems.

Download or read book Femtosecond Time resolved Studies of Quantum Dots based Energy Transfer written by Smita Dayal and published by . This book was released on 2008 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of the Separation Dependent Fluorescence Resonant Energy Transfer Between CdSe ZnS Quantum Dots by Near field Scanning Optical Microscopy written by and published by . This book was released on 2009 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Near-field Scanning Optical Microscope (NSOM) is used to study the resonant energy transfer between different size CdSe/ZnS quantum dots (QDs). The NSOM system is used to bring the small QDs which are 6 nm in diameter close to 8 nm diameter QDs which are embed with PMMA on a cover glass. The PMMA is used to prevent the 8 nm QDs from aggregation, which allows us to locate one dot on the cover slide and have the potential to get the interaction of two individual dots. A systematic methodology is used to localize a single QD on the cover glass and align the small and large QDs. Since the ground energy state of the small QDs match the excitation energy level of the large QDs. When the small dots get excited, part of the energy transfers to the large QDs. As the separation between small and large QDs is changed in near-field range (20-50nm), the transition probability is observed, indicating that the FRET level changes as a function of separation between small and large QDs. Possible future improvements are also discussed.

Download or read book Quantum Dots Applications in Biology written by Adriana Fontes and published by Humana. This book was released on 2016-09-17 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Quantum Dots: Applications in Biology, Second Edition, expert researchers in the field detail consolidated approaches as well as new trends in the field. Organized into five parts, the first part comprises an introduction on Quantum Dots (QDs) as fluorescent probes in Life Sciences. While the second section covers important features about QDs ́ preparative processes and characterizations for their successful application as fluorophores. The third part presents main aspects related to QDs methods applied to live cells and tissues. The fourth section focuses on QDs experiments in small animals and the fifth part demonstrates the versatility of QDs in a set of FRET applications. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols and key tips on troubleshooting and avoiding known pitfalls. Thorough and intuitive, In Quantum Dots: Applications in Biology, Second Edition aids scientists in continuing to study QDs by providing information about methods and protocols helping to expand their research.

Download or read book Advanced Fluorescence Microscopy written by Peter J. Verveer and published by Humana. This book was released on 2016-08-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides an overview of advanced fluorescence microscopy, covering a broad range of methods. Each chapter focuses on a different method and provides a practical guide for application in biological systems. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and cutting-edge, Advanced Fluorescence Microscopy: Methods and Protocols seeks to provide scientists with methods for biological systems that are of interest.

Download or read book The Handbook of Nanomedicine written by Kewal K. Jain and published by Humana Press. This book was released on 2017-03-20 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanomedicine is defined as the application of nanobiotechnology in clinical medicine, which is currently being used to research the pathomechanism of disease, refine molecular diagnostics, and aid in the discovery, development, and delivery of drugs. In The Handbook of Nanomedicine, Third Edition, Prof. Kewal K. Jain updates, reorganizes, and replaces information in the comprehensive second edition in order to capture the most recent advances in this dynamic field. Important components of nanomedicine such as drug delivery via nanobiotechnology and nanopharmaceuticals as well as nanooncology, where the greatest number of advances are occurring, are covered extensively. As this text is aimed at nonmedical scientists, pharmaceutical personnel, as well as physicians, descriptions of the technology involved and other medical terminology are kept as clear and simple as possible. In depth and cutting-edge, The Handbook of Nanomedicine, Third Edition informs its readers of the ever-growing field of nanomedicine, destined to play a significant role in the future of healthcare.

Download or read book FRET and FLIM Techniques written by Theodorus W. J. Gadella and published by Elsevier. This book was released on 2011-07-29 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reviews the techniques Förster Resonance Energy Transfer (FRET) and Fluorescence Lifetime Imaging Microscopy (FLIM) providing researchers with step by step protocols and handy hints and tips. Both have become staple techniques in many biological and biophysical fields.

Download or read book Modern Tools for Time Resolved Luminescence Biosensing and Imaging written by and published by Frontiers Media SA. This book was released on 2021-09-01 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Practical Flow Cytometry written by Howard M. Shapiro and published by John Wiley & Sons. This book was released on 2005-02-25 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the reviews of the 3rd Edition... "The standard reference for anyone interested in understandingflow cytometry technology." American Journal of Clinical Oncology "...one of the most valuable of its genre and...addressed to awide audience?written in such an attractive way, being bothinformative and stimulating." Trends in Cell Biology This reference explains the science and discusses the vastbiomedical applications of quantitative analytical cytology usinglaser-activated detection and cell sorting. Now in its fourthedition, this text has been expanded to provide full coverage ofthe broad spectrum of applications in molecular biology andbiotechnology today. New to this edition are chapters on automatedanalysis of array technologies, compensation, high-speed sorting,reporter molecules, and multiplex and apoptosis assays, along withfully updated and revised references and a list of suppliers.