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Quantum biology

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https://www.readbyqxmd.com/read/28526354/outline-of-a-unified-darwinian-evolutionary-theory-for-physical-and-biological-systems
#1
REVIEW
Carlos Baladrón, Andrei Khrennikov
The scheme of a unified Darwinian evolutionary theory for physical and biological systems is described. Every physical system is methodologically endowed with a classical information processor what turns every system into an agent being also susceptible to evolution. Biological systems retain this structure as natural extensions of physical systems from which they are built up. Optimization of information flows turns out to be the key element to study the possible emergence of quantum behavior and the unified Darwinian description of physical and biological systems...
May 16, 2017: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/28524362/a-novel-chemiluminescence-sensor-for-the-determination-of-indomethacin-based-on-sulfur-and-nitrogen-co-doped-carbon-quantum-dot-kmno4-reaction
#2
Tooba Hallaj, Mohammad Amjadi, Jamshid L Manzoori, Neda Azizi
We report on a simple and sensitive sulfur and nitrogen co-doped carbon quantum dot (S,N-CQD)-based chemiluminescence (CL) sensor for the determination of indomethacin. S,N-CQDs were prepared by a hydrothermal method and characterized by fluorescence spectra, Fourier transform infrared spectroscopy and transmission electron microscopy. To obtain the best CL system for determination of indomethacin, the reaction of S,N-CQDs with some common oxidants was studied. Among the tested systems, the S,N-CQD-KMnO4 reaction showed the highest sensitivity for the detection of indomethacin...
May 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28514712/nitrogen-doped-carbon-dots-derived-from-sargassum-fluitans-as-fluorophore-for-dna-detection
#3
S Godavarthi, K Mohan Kumar, E Vázquez Vélez, A Hernandez-Eligio, M Mahendhiran, N Hernandez-Como, M Aleman, L Martinez Gomez
This work focused on the use of waste seaweed Sargassum fluitans (S. fluitans) as carbon source precursor to prepare nitrogen doped carbon dots (NCDs) by hydrothermal method. High resolution transmission electron microscopic (HR-TEM) studies revealed that the synthesized water soluble NCDs are in the size range of 2-8nm and exhibits excellent fluorescent properties with a quantum yield of 18.2%. Elemental nitrogen in NCDs was evidenced by X-ray photoelectron spectroscopy (XPS) and Fourier transformed infrared spectrum (FT-IR)...
May 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28513884/oxidized-quasi-carbon-nitride-quantum-dots-inhibit-ice-growth
#4
Guoying Bai, Zhiping Song, Hongya Geng, Dong Gao, Kai Liu, Shuwang Wu, Wei Rao, Liangqia Guo, Jianjun Wang
Antifreeze proteins (AFPs), a type of high-efficiency but expensive and often unstable biological antifreeze, have stimulated substantial interest in the search for synthetic mimics. However, only a few reported AFP mimics display thermal hysteresis, and general criteria for the design of AFP mimics remain unknown. Herein, oxidized quasi-carbon nitride quantum dots (OQCNs) are synthesized through an up-scalable bottom-up approach. They exhibit thermal-hysteresis activity, an ice-crystal shaping effect, and activity on ice-recrystallization inhibition...
May 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28513713/one-step-hydrothermal-synthesis-of-photoluminescent-carbon-nanodots-with-selective-antibacterial-activity-against-porphyromonas-gingivalis
#5
Junjun Liu, Siyu Lu, Qiuling Tang, Kai Zhang, Weixian Yu, Hongchen Sun, Bai Yang
Carbon dots (CDs) with high quantum yield (QY), low toxicity and good biocompatibility are the major quests of biomedical research. In this paper, we develop a green, simple hydrothermal approach to synthesize water-soluble, nontoxic, highly photoluminescent carbon nanodots (CNDs) from Metronidazole, which possess selective antibacterial activity against obligate anaerobes for the first time. Metronidazole was used as a sole precursor to prepare CNDs at 250 °C (CNDs-250) for 8 h. After the CNDs-250 with an average size of 2...
May 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28511312/-size-exclusionchromatography-high-performance-liquid-chromatography-inductively-coupled-plasma-mass-spectrometry-for-measuring-the-stability-of-cadmium-telluridequantum-dots
#6
H L Li, Y Hu, P J Meng, X Y Zhang, Y Y Xie, P L Huang
Objective: To investigate the peak time and peak area of elements in cadmium telluride quantum dots (CdTe QDs) using size exclusion chromatography-high-performance liquid chromatography-inductively coupled plasma mass spectrometry, as well as the biological stability of CdTe QDs in vivo and in vitro. Methods: Transmission electron microscope and ultraviolet fluorescence were used for characterization and synthesis of water-soluble CdTe QDs, and CdTe QDs were added to double-distilled water, mobile phase, or bovine serum medium to observe the change in stability after different periods of time...
March 20, 2017: Chinese Journal of Industrial Hygiene and Occupational Diseases
https://www.readbyqxmd.com/read/28509528/synthesis-of-water-soluble-ag2s-quantum-dots-with-fluorescence-in-the-second-near-infrared-window-for-turn-on-detection-of-zn-ii-and-cd-ii
#7
Qian Wu, Ming Zhou, Jing Shi, Qijun Li, Mingyang Yang, Zhixun Zhang
The second near-infrared window emission (1.0-1.7 μm, NIR-II) has received extensive attention with the advantages of negligible tissue scattering, reduced auto-fluorescence and less background noise. Here a novel analysis platform based on quantum dots (QDs) for highly selective detection of Zn(2+) and Cd(2+) with an enhanced NIR-II fluorescence is reported for the first time. We have developed a facile two-step route to synthesize the water-soluble Ag2S QDs, constituting of a green hydrothermal process and followed surface ligands exchange...
May 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28508151/tunable-and-nontoxic-fluorescent-probes-based-on-carbon-dots-for-imaging-of-indole-propionic-acid-receptor-in-plant-tissues-in-situ
#8
Bixia Lin, Ying Yu, Fangfei Liu, Yujuan Cao, Manli Guo
Indole propionic acid (IPA) is one of the important plant growth hormones for promoting rooting and fruiting. Labeling IPA receptor in plant tissues is able to further track the signal transduction processes of IPA and uncover the function mechanism of IPA on crop productions. In this paper, a tunable and nontoxic fluorescent probe for IPA receptors was designed and synthetized base on carbon dots (C dots). Firstly carboxyl-modified carbon dots were prepared by high temperature cracking of citric acid. The fluorescence emission wavelengths of C dots varied with the excitation wavelengths change...
May 15, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28507710/semiconducting-polymer-dots-with-bright-narrow-band-emission-at-800-nm-for-biological-applications
#9
Dandan Chen, I-Che Wu, Zhihe Liu, Ying Tang, Haobin Chen, Jiangbo Yu, Changfeng Wu, Daniel T Chiu
The development of near-infrared (NIR) fluorescent probes is critical for in vivo exploration of the fundamental and complex processes in living systems by noninvasive fluorescence imaging techniques. Semiconducting polymer dots (Pdots) are emerging as important probes that exhibit several advantages, such as high brightness and biocompatibility. However, NIR-emitting Pdots are very rare, particularly at the center (∼800 nm) of the first optical window of biological tissues (between 650 nm and 950 nm). In this paper, we describe the synthesis of a semiconducting polymer with bright and narrow-band emission at 800 nm...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28504463/magnetocatalytic-graphene-quantum-dots-janus-micromotors-for-bacterial-endotoxin-detection
#10
Beatriz Jurado-Sánchez, Marta Pacheco, Jaime Rojo, Alberto Escarpa
Magnetocatalytic hybrid Janus micromotors encapsulating phenylboronic acid (PABA) modified graphene quantum dots (GQDs) are described herein as ultrafast sensors for the detection of deadly bacteria endotoxins. A bottom-up approach was adopted to synthesize an oil-in-water emulsion containing the GQDs along with a high loading of platinum and iron oxide nanoparticles on one side of the Janus micromotor body. The two different "active regions" enable highly efficient propulsion in the presence of hydrogen peroxide or magnetic actuation without the addition of a chemical fuel...
May 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28504415/highly-luminescent-folate-functionalized-au22-nanoclusters-for-bioimaging
#11
Kyunglim Pyo, Nguyen Hoang Ly, Sook Young Yoon, Yiming Shen, Seon Young Choi, So Yeong Lee, Sang-Woo Joo, Dongil Lee
Gold nanoclusters are emerging as new materials for biomedical applications because of promises offered by their ultrasmall size and excellent biocompatibility. Here, the synthesis and optical and biological characterizations of a highly luminescent folate-functionalized Au22 cluster (Au22 -FA) are reported. The Au22 -FA clusters are synthesized by functionalizing the surface of Au22 (SG)18 clusters, where SG is glutathione, with benzyl chloroformate and folate. The functionalized clusters are highly water-soluble and exhibit remarkably bright luminescence with a quantum yield of 42%, significantly higher than any other water-soluble gold clusters protected with thiolate ligands...
May 15, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28504271/probing-nanofriction-and-aubry-type-signatures-in-a-finite-self-organized-system
#12
J Kiethe, R Nigmatullin, D Kalincev, T Schmirander, T E Mehlstäubler
Friction in ordered atomistic layers plays a central role in various nanoscale systems ranging from nanomachines to biological systems. It governs transport properties, wear and dissipation. Defects and incommensurate lattice constants markedly change these properties. Recently, experimental systems have become accessible to probe the dynamics of nanofriction. Here, we present a model system consisting of laser-cooled ions in which nanofriction and transport processes in self-organized systems with back action can be studied with atomic resolution...
May 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28494396/a-comparative-study-of-the-spectral-fluorometric-properties-and-photostability-of-natural-curcumin-iron-and-boron-complexed-curcumin
#13
Fatima Mohammed, Fiza Rashid-Doubell, Seamas Cassidy, Fryad Henari
Curcumin is a yellow phenolic compound with a wide range of reported biological effects. However, two main obstacles hinder the use of curcumin therapeutically, namely its poor bioavailability and photostability. We have synthesized two curcumin complexes, the first a boron curcumin complex (B-Cur2) and the second an iron (Fe-Cur3) complex of curcumin. Both derivatives showed high fluorescence efficiency (quantum yield) and greater photostability in solution. The improved photostability could be attributed to the coordination structures and the removal of β-diketone group from curcumin...
April 21, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28492303/a-unique-integration-strategy-for-the-rational-design-of-optically-tunable-near-infrared-fluorophores
#14
Hua Chen, Baoli Dong, Yonghe Tang, Weiying Lin
Fluorescence imaging is a rapidly growing technique for noninvasive imaging of biological molecules and processes with high spatial and temporal resolution. For effective biological imaging, it is essential and important to develop robust fluorescent dyes, in particular, near-infrared (NIR) fluorescent dyes with favorable optical properties. Compared with the visible light emitting dyes, NIR dyes have relatively longer emission wavelengths (650-900 nm) with lower energy and are advantageous as imaging agents owing to the minimum photodamage of NIR light to biological samples, deep penetration into tissues, and low interference from autofluorescence of biomolecules...
May 11, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28490730/multi-pass-transmission-electron-microscopy
#15
Thomas Juffmann, Stewart A Koppell, Brannon B Klopfer, Colin Ophus, Robert M Glaeser, Mark A Kasevich
Feynman once asked physicists to build better electron microscopes to be able to watch biology at work. While electron microscopes can now provide atomic resolution, electron beam induced specimen damage precludes high resolution imaging of sensitive materials, such as single proteins or polymers. Here, we use simulations to show that an electron microscope based on a multi-pass measurement protocol enables imaging of single proteins, without averaging structures over multiple images. While we demonstrate the method for particular imaging targets, the approach is broadly applicable and is expected to improve resolution and sensitivity for a range of electron microscopy imaging modalities, including, for example, scanning and spectroscopic techniques...
May 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28489370/improved-polarizable-dipole-dipole-interaction-model-for-hydrogen-bonding-stacking-t-shaped-and-x-h%C3%A2-%C3%A2-%C3%A2-%C3%AF-interactions
#16
Xi-Chan Gao, Qiang Hao, Chang-Sheng Wang
The polarizable dipole-dipole interaction model was formulated in our laboratory to rapidly simulate hydrogen bonding in biosystems. In this paper, this model is improved and further parametrized for stacking, T-shaped, and X-H···π interactions by adding the orbital overlap term and fitting to 19 CCSD(T)/CBS interaction energy curves of training dimers. The performance of our model is assessed through its application to more than 100 complexes, including hydrogen-bonded, stacked, T-shaped, and X-H···π complexes...
May 19, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28488433/attosecond-electron-dynamics-in-molecules
#17
Mauro Nisoli, Piero Decleva, Francesca Calegari, Alicia Palacios, Fernando Martín
Advances in attosecond science have led to a wealth of important discoveries in atomic, molecular, and solid-state physics and are progressively directing their footsteps toward problems of chemical interest. Relevant technical achievements in the generation and application of extreme-ultraviolet subfemtosecond pulses, the introduction of experimental techniques able to follow in time the electron dynamics in quantum systems, and the development of sophisticated theoretical methods for the interpretation of the outcomes of such experiments have raised a continuous growing interest in attosecond phenomena, as demonstrated by the vast literature on the subject...
May 10, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28486906/safety-and-toxicological-considerations-of-nanomedicines-the-future-directions
#18
Parmi Patel, Jigna Shah
Nanomedicine, an emerging nanotechnology, imparts special biological features due to their quantum size and is a promising candidate for targeted drug delivery. At present, in spite of its novel applications in medical sciences, certain existing gaps still needs to be addressed such as fate of nanoparticles and its toxicity assessment on human health. Behaviour of the entities post human body exposure and its deposition up to certain extent are some of the crucial factors to be considered for a successful treatment approach...
May 9, 2017: Current Clinical Pharmacology
https://www.readbyqxmd.com/read/28483446/molecular-recognition-of-the-environment-and-mechanisms-of-the-origin-of-species-in-quantum-like-modeling-of-evolution
#19
REVIEW
Alexey V Melkikh, Andrei Khrennikov
A review of the mechanisms of speciation is performed. The mechanisms of the evolution of species, taking into account the feedback of the state of the environment and mechanisms of the emergence of complexity, are considered. It is shown that these mechanisms, at the molecular level, cannot work steadily in terms of classical mechanics. Quantum mechanisms of changes in the genome, based on the long-range interaction potential between biologically important molecules, are proposed as one of possible explanation...
May 5, 2017: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/28482600/facile-synthesis-of-fluorescence-carbon-dots-from-sweet-potato-for-fe-3-sensing-and-cell-imaging
#20
Jie Shen, Shaoming Shang, Xiuying Chen, Dan Wang, Yan Cai
In this study, a facile synthesis of fluorescence carbon dots (CDs) from sweet potato was performed through hydrothermal treatment. The obtained CDs with quantum yield of 8.64% have good dispersibility due to the soluble functional groups on their surfaces. The characterization of CDs was carried out and their possible formation mechanism was also discussed. In addition, the cytotoxicity results showed that the CDs exhibit non toxicity within 100μg/mL. At this concentration, the CDs were applied in cell imaging, indicating that they are promising fluorescent probes for biological imaging...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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