scholarly journals A Picture of Modern Tc-99m Radiopharmaceuticals: Production, Chemistry, and Applications in Molecular Imaging

2019 ◽  
Vol 9 (12) ◽  
pp. 2526 ◽  
Author(s):  
Alessandra Boschi ◽  
Licia Uccelli ◽  
Petra Martini
Keyword(s):  
Molecular Imaging ◽  
Chemical Properties ◽  
Molecular Probes ◽  
Modern Concept ◽  
Reconstruction Algorithms ◽  
Technetium 99M ◽  
Non Invasive ◽  
Radio Imaging ◽  
99Mtc Radiopharmaceuticals ◽  
Physical And Chemical

Even today, techentium-99m represents the radionuclide of choice for diagnostic radio-imaging applications. Its peculiar physical and chemical properties make it particularly suitable for medical imaging. By the use of molecular probes and perfusion radiotracers, it provides rapid and non-invasive evaluation of the function, physiology, and/or pathology of organs. The versatile chemistry of technetium-99m, due to its multi-oxidation states, and, consequently, the ability to produce a variety of complexes with particular desired characteristics, are the major advantages of this medical radionuclide. The advances in technetium coordination chemistry over the last 20 years, in combination with recent advances in detector technologies and reconstruction algorithms, make SPECT’s spatial resolution comparable to that of PET, allowing 99mTc radiopharmaceuticals to have an important role in nuclear medicine and to be particularly suitable for molecular imaging. In this review the most efficient chemical methods, based on the modern concept of the 99mTc-metal fragment approach, applied to the development of technetium-99m radiopharmaceuticals for molecular imaging, are described. A specific paragraph is dedicated to the development of new 99mTc-based radiopharmaceuticals for prostate cancer.

POLYMER-MODIFIED GADOLINIUM NANOPARTICLES FOR TARGETED MAGNETIC RESONANCE IMAGING AND THERAPY

Nano LIFE ◽  
2010 ◽  
Vol 01 (03n04) ◽  
pp. 263-275 ◽  
Author(s):  
STEPHEN G. BOYES ◽  
MISTY D. ROWE ◽  
NATALIE J. SERKOVA ◽  
FERNANDO J. KIM ◽  
JAMES R. LAMBERT ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Molecular Imaging ◽  
Magnetic Resonance ◽  
Molecular Probes ◽  
Imaging Agents ◽  
Resonance Imaging ◽  
Non Invasive ◽  
Gene And Protein Expression ◽  
Wide Range

Functional imaging is a novel area in radiological sciences and allows for the non-invasive assessment and visualization of specific targets such as gene and protein expression, metabolic rates, and drug delivery in intact living subjects. As such, the field of molecular imaging has been defined as the non-invasive, quantitative, and repetitive imaging of biomolecules and biological processes in living organisms. For example, cancer cells may be genetically altered to attract molecules that alter the magnetic susceptibility, thereby permitting their identification by magnetic resonance imaging. These contrast agents and/or molecular reporters are seen as essential to the task of molecular medicine to increase both sensitivity and specificity of imaging. Therefore, there are five general principles which need to be fulfilled in order to conduct a successful in vivo molecular imaging study: (1) selection of appropriate cellular and subcellular targets; (2) development of suitable in vivo affinity ligands (molecular probes); (3) delivery of these probes to the target organ; (4) amplification strategies able to detect minimal target concentrations; and (5) development of imaging systems with high resolution. Although there has been a wide range of routes taken to incorporate both imaging agents and a disease-targeting moiety into diagnostic devices, arguably the most interesting of these routes employs the use of nanoparticles. Nanoscale diagnostic systems that incorporate molecular targeting agents and diagnostic imaging capabilities are emerging as the next-generation imaging agents and have the potential to dramatically improve the outcome of the imaging, diagnosis, and treatment of a wide range of diseases. The present review addresses chemical aspects in development of molecular probes based upon gadolinium nanoparticles and their potential role in translational clinical imaging and therapy.

scholarly journals Recent Endeavors on Molecular Imaging for Mapping Metals in Biology

2020 ◽  
Vol 6 (5) ◽  
pp. 159-178
Author(s):  
Jing Gao ◽  
Yuncong Chen ◽  
Zijian Guo ◽  
Weijiang He
Keyword(s):  
Molecular Imaging ◽  
Transition Metals ◽  
Photoacoustic Imaging ◽  
Molecular Probes ◽  
Future Research ◽  
Non Invasive ◽  
Dynamic Events ◽  
Metal Sensors ◽  
Health And Disease ◽  
Future Research Directions

Abstract Transition metals such as zinc, copper and iron play vital roles in maintaining physiological functions and homeostasis of living systems. Molecular imaging, including two-photon imaging (TPI), bioluminescence imaging (BLI) and photoacoustic imaging (PAI), could act as non-invasive toolkits for capturing dynamic events in living cells, tissues and whole animals. Herein, we review the recent progress in the development of molecular probes for essential transition metals and their biological applications. We emphasize the contributions of metallostasis to health and disease, and discuss the future research directions about how to harness the great potential of metal sensors. Graphic Abstract

scholarly journals Construction of Novel Nanohybrids(Fe3O4/HAp/Au) With Multifunctional Structure for Efficient Photocatalytic Application

2021 ◽  
Author(s):  
Rui Wu ◽  
Xiaohui Ji ◽  
Donghui Xia ◽  
Haitao Xiong ◽  
Jiufu Lu
Keyword(s):  
Drug Delivery ◽  
Molecular Imaging ◽  
Noble Metals ◽  
Organic Pollutant ◽  
Chemical Properties ◽  
High Photocatalytic Activity ◽  
Composite Nanoparticles ◽  
Magnetic Composite ◽  
Molecular Imaging Probe ◽  
Physical And Chemical

Abstract The controlled synthesis of nanohybrids with magnetic metal oxides (Fe3O4), noble metals Au, and hydroxyapatite (HAp, hydroxyapatite) have received considerable attention for applications in photocatalysis, molecular imaging, drug delivery. Green and multifunctional Fe3O4/HAp/Au composite nanoparticles (NPs) with biocompatibility and magnetism for photocatalyst was developed by a facile method. The overall architecture of nanocomposites is one of the most important factors dictating the physical and chemical properties of nanohybrids with significant advances and various functions. The improvement performance of the Fe3O4/HAp/Au in photocatalysis was evaluated by degradation of organic pollutant (methylene blue, MB) under visible light irradiation. The results showed that the hybrid Fe3O4/HAp/Au NP displayed high photocatalytic activity due to surface plasmon resonance (SPR) of Au, the combination of magnetic NPs and HAps with adsorption, also the mechanism was discussed in detail. The efficient magnetic composite nanoparticles can be separated with target and recover, as well as recycle processes. It proposed novel NPs and methodology to design and fabrication of multifunctional NPs with high quality for application of photocatalysis. Furthermore, it is expected that the safe, green and multifunctional composite NPs will provide an interesting platform not only for photocatalysis, but also for developing molecular imaging probe and drug delivery with target, as well as Raman detection.

Novel Biomaterials and Nano-Biotechnology Approaches in Tumor Diagnosis

2010 ◽  
Vol 76 ◽  
pp. 78-89 ◽  
Author(s):  
Amit Kumar Dinda ◽  
Chandravilas Keshvan Prashant
Keyword(s):  
Cancer Biology ◽  
Detection System ◽  
Chemical Properties ◽  
Molecular Probes ◽  
Common Disease ◽  
Early Diagnosis Of Cancer ◽  
Diagnosis Of Cancer ◽  
Detection Of Biomarkers ◽  
Physical And Chemical

Each year 10.9 million people worldwide are diagnosed with cancer and it is the third most common disease in world. Early diagnosis of cancer and cure are major challenges. Recent advances in development of novel biomaterials as well as rapid progress in the area of nano-biotechnology has potentials to change all the current modalities of cancer diagnosis and management. The unique physical and chemical properties of nanomaterials are extremely helpful for detection of biomarkers of the disease, molecular imaging as well as specific targeted therapy sparing the normal organs. Nanoparticle (NP) has large surface area which can be conjugated or coated with different molecular probes for diverse detection system (optical, electrical, magnetic etc.) as well as used as a vehicle to carry different biomolecules and anticancer drugs to tumor cells. Semiconductor quantum dot (QD) with novel optical and electronic properties helped to devise a new class of NP probes for molecular, cellular, and in vivo imaging. A large variety of materials ranging from metal, ceramic, polymer, lipid, protein and nucleic acid are used for developing novel nanoparticles with multiple functions which can detect different aspects of cancer biology and progression. The major issue of concern is biocompatibility and safety of these materials and their fate after in-vivo use. However with collaborative interdisciplinary research it will be possible to develop safer nanomaterials in future

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Biophysical Measurement of Molecular Weight of Foot-and-Mouth Disease RNA Fragments

1974 ◽  
Vol 32 ◽  
pp. 262-263
Author(s):  
Sydney S. Breese ◽  
Howard L. Bachrach
Keyword(s):  
Chemical Properties ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Distilled Water ◽  
Bovine Plasma ◽  
Mouth Disease Virus ◽  
Foot And Mouth ◽  
Carbon Coated ◽  
Rna Fragments ◽  
Physical And Chemical

Continuing studies on the physical and chemical properties of foot-and-mouth disease virus (FMDV) have included electron microscopy of RNA strands released when highly purified virus (1) was dialyzed against demlneralized distilled water. The RNA strands were dried on formvar-carbon coated electron microscope screens pretreated with 0.1% bovine plasma albumin in distilled water. At this low salt concentration the RNA strands were extended and were stained with 1% phosphotungstic acid. Random dispersions of strands were recorded on electron micrographs, enlarged to 30,000 or 40,000 X and the lengths measured with a map-measuring wheel. Figure 1 is a typical micrograph and Fig. 2 shows the distributions of strand lengths for the three major types of FMDV (A119 of 6/9/72; C3-Rezende of 1/5/73; and O1-Brugge of 8/24/73.

Tailoring microstructures of materials through biomimetics

1993 ◽  
Vol 51 ◽  
pp. 500-501
Author(s):  
Mehmet Sarikaya ◽  
Ilhan A. Aksay
Keyword(s):  
Chemical Properties ◽  
Design And Synthesis ◽  
Structure Sensitive ◽  
Macro Scale ◽  
Methods Of Synthesis ◽  
Successive Level ◽  
Engineering Materials ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Synthesis Of Materials

Biomimetics involves investigation of structure, function, and methods of synthesis of biological composite materials. The goal is to apply this information to the design and synthesis of materials for engineering applications.Properties of engineering materials are structure sensitive through the whole spectrum of dimensions from nanometer to macro scale. The goal in designing and processing of technological materials, therefore, is to control microstructural evolution at each of these dimensions so as to achieve predictable physical and chemical properties. Control at each successive level of dimension, however, is a major challenge as is the retention of integrity between successive levels. Engineering materials are rarely fabricated to achieve more than a few of the desired properties and the synthesis techniques usually involve high temperature or low pressure conditions that are energy inefficient and environmentally damaging.In contrast to human-made materials, organisms synthesize composites whose intricate structures are more controlled at each scale and hierarchical order.

Response of corn (Zea mays L.) to various organic-based fertilizers in marginal upland of Sta. Rita, Samar

2017 ◽  
pp. 31-43
Author(s):  
Berta Ratilla ◽  
Loreme Cagande ◽  
Othello Capuno
Keyword(s):  
Block Design ◽  
Management Strategies ◽  
Chemical Properties ◽  
Organic Fertilizers ◽  
Growth And Yield ◽  
Physical And Chemical Properties ◽  
Total N ◽  
Randomized Complete Block Design ◽  
Physical And Chemical ◽  
And Chemical Properties

Organic farming is one of the management strategies that improve productivity of marginal uplands. The study aimed to: (1) evaluate effects of various organic-based fertilizers on the growth and yield of corn; (2) determine the appropriate combination for optimum yield; and (3) assess changes on the soil physical and chemical properties. Experiment was laid out in Randomized Complete Block Design, with 3 replications and 7 treatments, namely; T0=(0-0-0); T1=1t ha-1 Evans + 45-30-30kg N, P2O5, K2O ha-1; T2=t ha-1 Wellgrow + 45-30-30kg N, P2O5, K2O ha-1; T3=15t ha-1 chicken dung; T4=10t ha-1 chicken dung + 45-30-30kg N, P2O5, K2O ha-1; T5=15t ha-1 Vermicast; and T6=10t ha-1 Vermicast + 45-30-30kg N, P2O5, K2O ha-1. Application of organic-based fertilizers with or without inorganic fertilizers promoted growth of corn than the control. But due to high infestation of corn silk beetle(Monolepta bifasciata Horns), its grain yield was greatly affected. In the second cropping, except for Evans, any of these fertilizers applied alone or combined with 45-30-30kg N, P2O5, K2O ha-1 appeared appropriate in increasing corn earyield. Soil physical and chemical properties changed with addition of organic fertilizers. While bulk density decreased irrespective of treatments, pH, total N, available P and exchangeable K generally increased more with chicken dung application.

Sign in / Sign up

Export Citation Format

Share Document