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排序方式: 共有101条查询结果,搜索用时 15 毫秒
51.
Gabrielle A. Leith Allison M. Rice Brandon J. Yarbrough Anna A. Berseneva Richard T. Ly Charles N. Buck Denis Chusov Amy J. Brandt Donna A. Chen Benjamin W. Lamm Morgan Stefik Kenneth S. Stephenson Mark D. Smith Aaron K. Vannucci Perry J. Pellechia Sophya Garashchuk Natalia B. Shustova 《Angewandte Chemie (International ed. in English)》2020,59(15):6000-6006
The effect of donor (D)–acceptor (A) alignment on the materials electronic structure was probed for the first time using novel purely organic porous crystalline materials with covalently bound two‐ and three‐dimensional acceptors. The first studies towards estimation of charge transfer rates as a function of acceptor stacking are in line with the experimentally observed drastic, eight‐fold conductivity enhancement. The first evaluation of redox behavior of buckyball‐ or tetracyanoquinodimethane‐integrated crystalline was conducted. In parallel with tailoring the D‐A alignment responsible for “static” changes in materials properties, an external stimulus was applied for “dynamic” control of the electronic profiles. Overall, the presented D–A strategic design, with stimuli‐controlled electronic behavior, redox activity, and modularity could be used as a blueprint for the development of electroactive and conductive multidimensional and multifunctional crystalline porous materials. 相似文献
52.
Lima Ade F de Moura GF de Lima MA de Souza PM da Silva CA Takaki GM do Nascimento AE 《Molecules (Basel, Switzerland)》2011,16(3):2486-2500
This study concerns the metabolism of polyphosphate in Trichoderma harzianum, a biocontrol agent with innate resistance against most chemicals used in agriculture, including metals, when grown in the presence of different concentrations of cadmium. The biomass production was affected by the concentration of metal used. Control cultures were able to accumulate polyphosphate under the conditions used. Moreover, the presence of cadmium induced a reduction in polyphosphate content related to the concentration used. The morphological/ultrastructural aspects were characterized by using optical and scanning electron microscopy, and were affected by the heavy metal presence and concentration. The efficiency of cadmium removal revealed the potential of the microorganism for use in remediation. The data indicate the potential for polyphosphate accumulation by the fungus, as well as its degradation related to tolerance/survival in the presence of cadmium ions. 相似文献
53.
da Silva Fernanda Gabrielle Soares Ferreira Andréia Rodrigues dos Santos Clenilton Costa de Menezes Alan Silva de Cássia Silva Luz Rita Damos Flávio Santos 《Journal of Solid State Electrochemistry》2021,25(8-9):2213-2224
Journal of Solid State Electrochemistry - Photoelectrochemical systems based on half-photoelectrochemical cells have been widely exploited in the development of analytical methods. However, the... 相似文献
54.
55.
Gabrielle M. Risica Dr. Veacheslav Vieru Branford O. Wilkins Trevor P. Latendresse Dr. Joseph H. Reibenspies Dr. Nattamai S. Bhuvanesh Dr. Gregory P. Wylie Prof. Dr. Liviu F. Chibotaru Prof. Dr. Michael Nippe 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(32):13437-13442
We report the first f-block-ruthenocenophane complexes 1 (Dy) and 2 (Tb) and provide a comparative discussion of their magnetic structure with respect to earlier reported ferrocenophane analogues. While axial elongation of the rare trigonal-prismatic geometry stabilizes the magnetic ground state in the case of Dy3+ and results in a larger barrier to magnetization reversal (U), a decrease in U is observed for the case of Tb3+. 相似文献
56.
Stephanie K. Polutchko Gabrielle N. E. Glime Barbara Demmig-Adams 《Molecules (Basel, Switzerland)》2021,26(17)
Prevention of neurodegeneration during aging, and support of optimal brain function throughout the lifespan, requires protection of membrane structure and function. We review the synergistic action of different classes of dietary micronutrients, as well as further synergistic contributions from exercise and stress reduction, in supporting membrane structure and function. We address membrane-associated inflammation involving reactive oxygen species (ROS) that produce immune regulators from polyunsaturated fatty acids (PUFAs) of membrane phospholipids. The potential of dietary micronutrients to maintain membrane fluidity and prevent chronic inflammation is examined with a focus on synergistically acting membrane-soluble components (zeaxanthin, lutein, vitamin E, and omega-3 PUFAs) and water-soluble components (vitamin C and various phenolics). These different classes of micronutrients apparently operate in a series of intertwined oxidation-reduction cycles to protect membrane function and prevent chronic inflammation. At this time, it appears that combinations of a balanced diet with regular moderate exercise and stress-reduction practices are particularly beneficial. Effective whole-food-based diets include the Mediterranean and the MIND diet (Mediterranean-DASH Intervention for Neurodegenerative Delay diet, where DASH stands for Dietary Approaches to Stop Hypertension). 相似文献
57.
We present what is to our knowledge a new method for measuring the relative piston between two independent beams separated by a physical gap, typical of petawatt facilities. The feasibility of this measurement, based on quadriwave lateral shearing interferometry, has been demonstrated experimentally: piston has been measured with accuracy and sensitivity better than 50 nm. 相似文献
58.
Fan Zhang Andrew J. Allen Lyle E. Levine Gabrielle G. Long Ivan Kuzmenko Jan Ilavsky 《Journal of synchrotron radiation》2018,25(5):1354-1361
This work reports a harmonic‐rejection scheme based on the combination of Si(111) monochromator and Si(220) harmonic‐rejection crystal optics. This approach is of importance to a wide range of X‐ray applications in all three major branches of modern X‐ray science (scattering, spectroscopy, imaging) based at major facilities, and especially relevant to the capabilities offered by the new diffraction‐limited storage rings. It was demonstrated both theoretically and experimentally that, when used with a synchrotron undulator source over a broad range of X‐ray energies of interest, the harmonic‐rejection crystals transmit the incident harmonic X‐rays on the order of 10?6. Considering the flux ratio of fundamental and harmonic X‐rays in the incident beam, this scheme achieves a total flux ratio of harmonic radiation to fundamental radiation on the order of 10?10. The spatial coherence of the undulator beam is preserved in the transmitted fundamental radiation while the harmonic radiation is suppressed, making this scheme suitable not only for current third‐generation synchrotron sources but also for the new diffraction‐limited storage rings where coherence preservation is an even higher priority. Compared with conventional harmonic‐rejection mirrors, where coherence is poorly preserved and harmonic rejection is less effective, this scheme has the added advantage of lower cost and footprint. This approach has been successfully utilized at the ultra‐small‐angle X‐ray scattering instrument at the Advanced Photon Source for scattering, imaging and coherent X‐ray photon correlation spectroscopy experiments. With minor modification, the harmonic rejection can be improved by a further five orders of magnitude, enabling even more performance capabilities. 相似文献
59.
60.
Dr. Sounderya Nagarajan Dr. Florent Poyer Dr. Laura Fourmois Delphine Naud-Martin Dr. Kadda Medjoubi Dr. Andrea Somogyi Gabrielle Schanne Dr. Lucas Henry Nicolas Delsuc Clotilde Policar Dr. Helene C. Bertrand Dr. Florence Mahuteau-Betzer 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(15):e202104424
Triphenylamine (TP) derivatives such as two-branch cationic vinylbenzimidazolium triphenylamine TP−2Bzim are promising turn-on fluorescent probes suitable for two-photon imaging, labelling mitochondria in live cells. Here, we designed two TP−2Bzim derivatives as bimodal probes suitable for X-ray fluorescence imaging. The conjugation of the TP core with a rhenium tricarbonyl moiety in the TP−RePyta probe altered the localisation in live cells from mitochondria to lysosomes. The introduction of bromine on the TP core generated the TP−Br probe retaining good photophysical properties and mitochondria labelling in live cells. The influence of calcium channels in the uptake of TP−Br was studied. Synchrotron Radiation X-ray Fluorescence (SXRF) imaging of bromine enabled the detection of TP−Br and suggested a negligible presence of the probe in an unbound state in the incubated cells, a crucial point in the development of these probes. This study paves the way towards the development of TP probes as specific organelle stainers suitable for SXRF imaging. 相似文献