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https://www.readbyqxmd.com/read/29185339/ultra-bright-fluorescent-silica-nanoparticle-embedded-with-conjugated-oligomers-and-their-application-for-latent-fingerprint-detection
#1
Shijie Zhang, Ronghua Liu, Qianling Cui, Yu Yang, Qian Cao, Wenqiang Xu, Lidong Li
Fluorescent micro- and nano-sized particles have a broad range of applications in biology, medicine, and engineering. For these uses the materials should have high emission efficiency and good photostability. However, many organic fluorophores suffer from aggregation-induced quenching effects and photobleaching. Here, we used a simple method based on covalently blending a fluorescent conjugated oligomer with silica nanoparticles to achieve emission quantum yields as high as 97%. The resulting system also showed excellent stability under continuous light illumination, a range of pH values and temperatures, and in common solvents...
November 29, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29179091/facile-approach-to-synthesize-highly-fluorescent-multicolor-emissive-carbon-dots-via-surface-functionalization-for-cellular-imaging
#2
Aniruddha Kundu, Jungpyo Lee, Byeongho Park, Chaiti Ray, K Vijaya Sankar, Wook Sung Kim, Soo Hyun Lee, Il-Joo Cho, Seong Chan Jun
Luminescent nanomaterials are encouraging scaffolds for diverse applications such as chemical sensors and biosensors, imaging, drug delivery, diagnostics, catalysis, energy, photonics, medicine, and so on. Carbon dots (CDs) are a new class of luminescent carbonaceous nanomaterial that have appeared recently and reaped tremendous scientific interest. Herein, we have exploited a simple approach to prepare tuneable and highly fluorescent CDs via surface functionalization. The successful synthesis of CDs is manifested from several investigations like high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS)...
November 24, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29178081/stimuli-responsive-nanocarriers-for-intracellular-delivery
#3
REVIEW
Lemmuel L Tayo
The emergence of different nanoparticles (NPs) has made a significant revolution in the field of medicine. Different NPs in the form of metallic NPs, dendrimers, polymeric NPs, carbon quantum dots and liposomes have been functionalized and used as platforms for intracellular delivery of biomolecules, drugs, imaging agents and nucleic acids. These NPs are designed to improve the pharmacokinetic properties of the drug, improve their bioavailability and successfully surpass physiological or pathological obstacles in the biological system so that therapeutic efficacy is achieved...
November 25, 2017: Biophysical Reviews
https://www.readbyqxmd.com/read/29177682/density-functional-theory-study-of-structural-and-electronic-properties-of-trans-and-cis-structures-of-thiothixene-as-a-nano-drug
#4
Akram Noori Tahneh, Samaneh Bagheri Novir, Ebrahim Balali
The geometrical structure, electronic and optical properties, electronic absorption spectra, vibrational frequencies, natural charge distribution, MEP analysis and thermodynamic properties of the trans and cis structures of the drug thiothixene were investigated using density functional theory (DFT) and time-dependent DFT (TDDFT) methods with the B3LYP hybrid functional and 6-311 + G(d,p) basis set. The results of the calculations demonstrate that the cis structure of thiothixene has appropriate quantum properties that can act as an active medicine...
November 25, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/29171718/revealing-the-fate-of-transplanted-stem-cells-in-vivo-with-a-novel-optical-imaging-strategy
#5
Guangcun Chen, Suying Lin, Dehua Huang, Yejun Zhang, Chunyan Li, Mao Wang, Qiangbin Wang
Stem-cell-based regenerative medicine holds great promise in clinical practices. However, the fate of stem cells after transplantation, including the distribution, viability, and the cell clearance, is not fully understood, which is critical to understand the process and the underlying mechanism of regeneration for better therapeutic effects. Herein, we develop a dual-labeling strategy to in situ visualize the fate of transplanted stem cells in vivo by combining the exogenous near-infrared fluorescence imaging in the second window (NIR-II) and endogenous red bioluminescence imaging (BLI)...
November 24, 2017: Small
https://www.readbyqxmd.com/read/29167458/assembly-of-crispr-ribonucleoproteins-with-biotinylated-oligonucleotides-via-an-rna-aptamer-for-precise-gene-editing
#6
Jared Carlson-Stevermer, Amr A Abdeen, Lucille Kohlenberg, Madelyn Goedland, Kaivalya Molugu, Meng Lou, Krishanu Saha
Writing specific DNA sequences into the human genome is challenging with non-viral gene-editing reagents, since most of the edited sequences contain various imprecise insertions or deletions. We developed a modular RNA aptamer-streptavidin strategy, termed S1mplex, to complex CRISPR-Cas9 ribonucleoproteins with a nucleic acid donor template, as well as other biotinylated molecules such as quantum dots. In human cells, tailored S1mplexes increase the ratio of precisely edited to imprecisely edited alleles up to 18-fold higher than standard gene-editing methods, and enrich cell populations containing multiplexed precise edits up to 42-fold...
November 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/29157472/nuclear-magnetic-resonance-characterization-of-traditional-homeopathically-manufactured-copper-cuprum-metallicum-and-plant-gelsemium-sempervirens-medicines-and-controls
#7
Michel Van Wassenhoven, Martine Goyens, Marc Henry, Etienne Capieaux, Philippe Devos
BACKGROUND: NMR proton relaxation is sensitive to the dynamics of the water molecule H2O, through the interaction of the spin of the proton ((1)H) with external magnetic and electromagnetic fields. METHODS: We measured dilution and potentization processes through measurements of (1)H spin-lattice T1 and spin-spin T2 relaxation times. In order to interpret the recorded fluctuations in T1- or T2-values, experimental data were linearized by investigating how the area under a fluctuating time = f(dilution) curve (dilution integral or DI) changes with dilution...
November 2017: Homeopathy: the Journal of the Faculty of Homeopathy
https://www.readbyqxmd.com/read/29136875/a-turn-on-competitive-immunochromatographic-strips-integrated-with-quantum-dots-and-gold-nano-stars-for-cadmium-ion-detection
#8
Meng Xiao, Qiangqiang Fu, Haicong Shen, Yuan Chen, Wei Xiao, Daoguang Yan, Xiaojiang Tang, Zhiyong Zhong, Yong Tang
Immunochromatographic strips (ICSs) are inexpensive, simple, portable, and robust, and therefore have many uses in the medicinal, agricultural, and environmental industries. For detection of small molecules, current ICSs are competitive format (competitive ICSs, CICSs), which only offer a turn-off readout mode, and therefore lead to low sensitivity when evaluating results by the naked eye. To overcome this problem, we report a turn-on CICSs that relies on the ability of gold nano-stars (AuNSs) quenching the signal of quantum dots (QDs)...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29127376/genuine-multipartite-entanglement-in-the-3-photon-decay-of-positronium
#9
Beatrix C Hiesmayr, Pawel Moskal
The electron-positron annihilation into two photons is a standard technology in medicine to observe e.g. metabolic processes in human bodies. A new tomograph will provide the possibility to observe not only direct e (+) e (-) annihilations but also the 3 photons from the decay of ortho-positronium atoms formed in the body. We show in this contribution that the three-photon state with respect to polarisation degrees of freedom depends on the angles between the photons and exhibits various specific entanglement features...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29127318/minimally-invasive-hemostatic-materials-tackling-a-dilemma-of-fluidity-and-adhesion-by-photopolymerization-in-situ
#10
Yun Zhang, Dandan Song, Hong Huang, Zhiling Liang, Houhe Liu, Yugang Huang, Cheng Zhong, Guodong Ye
Hemostasis in vivo is a key to success in minimally invasive surgery (MIS). However, solid hemostatic materials cannot pass through the sheath tube of the MIS apparatus, while liquid ones are restricted by their low adhesion, which leads to them peeling off of tissue. To tackle the dilemma of fluidity and adhesion, a formulation containing a multifunctional sucrose allyl ether (SAE) monomer and an alpha-hydroxyketone liquid photoinitiator (HMPP) was applied as a lead hemostatic material for MIS. Real-time infrared results showed that SAE initiated by HMPP can rapidly polymerize into a transparent crosslinking membrane...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29093641/spatiotemporal-analysis-of-tropical-disease-research-combining-europe-pmc-and-affiliation-mapping-web-services
#11
Magnus Palmblad, Vetle I Torvik
Background: Tropical medicine appeared as a distinct sub-discipline in the late nineteenth century, during a period of rapid European colonial expansion in Africa and Asia. After a dramatic drop after World War II, research on tropical diseases have received more attention and research funding in the twenty-first century. Methods: We used Apache Taverna to integrate Europe PMC and MapAffil web services, containing the spatiotemporal analysis workflow from a list of PubMed queries to a list of publication years and author affiliations geoparsed to latitudes and longitudes...
2017: Tropical Medicine and Health
https://www.readbyqxmd.com/read/29072594/advances-in-fluorescent-single-chain-nanoparticles
#12
REVIEW
Julen De-La-Cuesta, Edurne González, José A Pomposo
Fluorophore molecules can be monitored by fluorescence spectroscopy and microscopy, which are highly useful and widely used techniques in cell biology, biochemistry, and medicine (e.g., biomarker analysis, immunoassays, cancer diagnosis). Several fluorescent micro- and nanoparticle systems based on block copolymer micelles and cross-linked polymer networks, quantum dots, π-conjugated polymers, and dendrimers have been evaluated as optical imaging systems. In this review, we highlight recent advances in the construction of fluorescent single-chain nanoparticles (SCNPs), which are valuable artificial soft nano-objects with a small tunable size (as small as 3 nm)...
October 26, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29058321/synthesis-and-structure-analysis-of-ferrocene-containing-pseudopeptides
#13
Gaetano Angelici, Marcin Górecki, Gennaro Pescitelli, Nicola Zanna, Magda Monari, Claudia Tomasini
Ferrocene with its aromaticity and facile redox properties is an attractive moiety to be incorporated into functional moieties. Medicinal applications of ferrocene are well known and ferrocene itself shows cytotoxic and antianemic properties. In this article, we will describe the synthesis and the structure analysis of two pseudopeptides containing a ferrocene moiety as N-terminal group. After purification, Fc-l-Phe-d-Oxd-OBn [l-Phel-phenylalanine; d-Oxd(4R,5S)-4-Methyl-5-carboxy-oxazolidin-2-one] appears as bright brown solid that spontaneously forms brown needles...
October 23, 2017: Biopolymers
https://www.readbyqxmd.com/read/29051461/exposure-to-inorganic-nanoparticles-routes-of-entry-immune-response-biodistribution-and-in-vitro-in-vivo-toxicity-evaluation
#14
REVIEW
Valeria De Matteis
The development of different kinds of nanoparticles, showing different physico-chemical properties, has fostered their large use in many fields, including medicine. As a consequence, inorganic nanoparticles (e.g., metals or semiconductors), have raised issues about their potential toxicity. The scientific community is investigating the toxicity mechanisms of these materials, in vitro and in vivo, in order to provide accurate references concerning their use. This review will give the readers a thorough exploration on the entry mechanisms of inorganic nanoparticles in the human body, such as titanium dioxide nanoparticles (TiO₂NPs), silicon dioxide nanoparticles (SiO₂NPs), zinc oxide nanoparticles (ZnONPs), silver nanoparticles (AgNPs), gold nanoparticles (AuNPs) and quantum dots (QDsNPs)...
October 17, 2017: Toxics
https://www.readbyqxmd.com/read/29040931/a-combined-experimental-ir-raman-and-uv-vis-and-quantum-chemical-study-of-canadine
#15
Bhawani Datt Joshi, Anubha Srivastava, Poonam Tandon, Sudha Jain, A P Ayala
Plant based natural products cover a major sector of the medicinal field, as such focus on plant research has been increased all over the world. As an attempt to aid that research, we have performed structural and spectroscopic analysis of a natural product, an alkaloid: canadine. Both ab initio Hartree-Fock (HF) and density functional theory (DFT) employing B3LYP using 6-311++G(d,p) basis set were used for the calculations. The calculated vibrational frequencies were scaled and compared with the experimental infrared and Raman spectra...
October 4, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28961225/graphene-quantum-dots-electrochemistry-and-sensitive-electrocatalytic-glucose-sensor-development
#16
Sanju Gupta, Tyler Smith, Alexander Banaszak, John Boeckl
Graphene quantum dots (GQDs), derived from functionalized graphene precursors are graphene sheets a few nanometers in the lateral dimension having a several-layer thickness. They are zero-dimensional materials with quantum confinement and edge site effects. Intense research interest in GQDs is attributed to their unique physicochemical phenomena arising from the sp²-bonded carbon nanocore surrounded with edged plane functional moieties. In this work, GQDs are synthesized by both solvothermal and hydrothermal techniques, with the optimal size of 5 nm determined using high-resolution transmission electron microscopy, with additional UV-Vis absorption and fluorescence spectroscopy, revealing electronic band signatures in the blue-violet region...
September 29, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28957627/automated-transition-state-search-and-its-application-to-diverse-types-of-organic-reactions
#17
Leif D Jacobson, Art D Bochevarov, Mark A Watson, Thomas F Hughes, David Rinaldo, Stephan Ehrlich, Thomas B Steinbrecher, S Vaitheeswaran, Dean M Philipp, Mathew D Halls, Richard A Friesner
Transition state search is at the center of multiple types of computational chemical predictions related to mechanistic investigations, reactivity and regioselectivity predictions, and catalyst design. The process of finding transition states in practice is, however, a laborious multistep operation that requires significant user involvement. Here, we report a highly automated workflow designed to locate transition states for a given elementary reaction with minimal setup overhead. The only essential inputs required from the user are the structures of the separated reactants and products...
October 17, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28955356/phosphorous-application-improves-drought-tolerance-of-phoebe-zhennan
#18
Akash Tariq, Kaiwen Pan, Olusanya A Olatunji, Corina Graciano, Zilong Li, Feng Sun, Xiaoming Sun, Dagang Song, Wenkai Chen, Aiping Zhang, Xiaogang Wu, Lin Zhang, Deng Mingrui, Qinli Xiong, Chenggang Liu
Phoebe zhennan (Gold Phoebe) is a threatened tree species in China and a valuable and important source of wood and bioactive compounds used in medicine. Apart from anthropogenic disturbances, several biotic constraints currently restrict its growth and development. However, little attention has been given to building adaptive strategies for its conservation by examining its morphological and physio-biochemical responses to drought stress, and the role of fertilizers on these responses. A randomized experimental design was used to investigate the effects of two levels of irrigation (well-watered and drought-stressed) and phosphorous (P) fertilization treatment (with and without P) to assess the morphological and physio-biochemical responses of P...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28925715/novel-carbon-dots-derived-from-schizonepetae-herba-carbonisata-and-investigation-of-their-haemostatic-efficacy
#19
Meiling Zhang, Yan Zhao, Jinjun Cheng, Xiaoman Liu, Yongzhi Wang, Xin Yan, Yue Zhang, Fang Lu, Qingguo Wang, Huihua Qu
Schizonepetae Herba Carbonisata (SHC) has been used in traditional Chinese medicine (TCM) to treat haemorrhagic diseases for more than 1000 years. However, little information is available on its haemostatic components and mechanism. In this study, we developed novel water-soluble carbon dots (CDs) in aqueous extracts of SHC for the first time and a modified pyrolysis method was used to prepare the SHC using Schizonepetae Herba (SH) as the sole precursor. The SHC-CDs were characterized using transmission electron microscopy (TEM), high-resolution TEM (HRTEM), Fourier transform infrared (FT-IR), ultraviolet-visible (UV-Vis) and fluorescence spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and high-performance liquid chromatography (HPLC)...
September 19, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28919707/quantum-mechanics-implementation-in-drug-design-workflows-does-it-really-help
#20
REVIEW
Olayide A Arodola, Mahmoud Es Soliman
The pharmaceutical industry is progressively operating in an era where development costs are constantly under pressure, higher percentages of drugs are demanded, and the drug-discovery process is a trial-and-error run. The profit that flows in with the discovery of new drugs has always been the motivation for the industry to keep up the pace and keep abreast with the endless demand for medicines. The process of finding a molecule that binds to the target protein using in silico tools has made computational chemistry a valuable tool in drug discovery in both academic research and pharmaceutical industry...
2017: Drug Design, Development and Therapy
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