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The Photochemistry of a bis-Crown Ether Based on Benzobis(thiazole) and Its Alkaline Earth Metal Cation Complexes
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ABSTRACT
Irradiation of acetonitrile solutions of the bis-crown ether E,E-2,7-bis[2-(6,7,9,10,12,13,15,16-octahydro-5,8,11,14,17-pentaoxabenzocyclopentadecen-2-yl)vinyl]-benzo[1,2-d;3,4-d']bisthiazole (hereafter, 1) gives efficient E [arrow right] Z photoisomerization (initial φ^sub trans[arrow right]cis^ = 0.48), leading to λ^sub exc^-dependent quasi-photostationary states composed primarily of E,Z and E,E isomer mixtures. Further irradiation gives [2 + 2]-cycloadducts of 1....
Related newspaper, magazine, and journal articles from HighBeam Research
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Increased Calcium Levels and Prolonged Shelf Life in Tomatoes Expressing Arabidopsis H^sup +^/Ca^sup 2+^ Transporters1
Plant Physiology
; Here we demonstrate that fruit from tomato (Lycopersicon esculentum) plants expressing Arabidopsis (Arabidopsis thaliana) H+/ cation exchangers (CAX) have more calcium (Ca^sup 2 and prolonged shelf life when compared to controls. Previously, using the prototypical CAX1, it has been demonstrated
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Spatial Distribution of Ca^sup 2+^ Signals during Repetitive Depolarizing Stimuli in Adrenal Chromaffin Cells
Biophysical Journal
; ABSTRACT Exocytosis in adrenal chromaffin cells is strongly influenced by the pattern of stimulation. To understand the dynamic and spatial properties of the underlying Ca^sup 2+^ signal, we used pulsed laser Ca^sup 2+^ imaging to capture Ca^sup 2+^ gradients during stimulation by single and
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Peripheral Hot Spots for Local Ca^sup 2+^ Release after Single Action Potentials in Sympathetic Ganglion Neurons
Biophysical Journal
; ABSTRACT Ca^sup 2+^ release from the endoplasmic reticulum (ER) contributes to Ca^sup 2+^ transients in frog sympathetic ganglion neurons. Here we use video-rate confocal fluo-4 fluorescence imaging to show that single action potentials reproducibly trigger rapidly rising Ca^sup 2+^ transients at
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CML24, Regulated in Expression by Diverse Stimuli, Encodes a Potential Ca^sup 2+^ Sensor That Functions in Responses to Abscisic Acid, Daylength, and Ion Stress1
Plant Physiology
; Changes in intracellular calcium (Ca^sup 2 levels serve to signal responses to diverse stimuli. Ca^sup 2+^ signals are likely perceived through proteins that bind Ca^sup 2 undergo conformation changes following Ca^sup 2+^ binding, and interact with target proteins. The 50-member calmodulin-like
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Synthesis and In Vivo Evaluation of 2 High-Affinity ^sup 76^Br-Labeled [sigma]^sub 2^-Receptor Ligands
The Journal of Nuclear Medicine
; The σ^sub 2^-receptor has been shown to be upregulated in proliferating tumors cells. The purpose of this study was to compare 3'-deoxy-3sup 18^F-fluorothymidine (^sup 18^F-FLT) and 2 new ^sup 76^Br-radio-labeled compounds that have a high affinity and selectivity for the σ^sub
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The Cooperative Response of Synaptotagmin I C2A. A Hypothesis for a Ca^sup 2+^-Driven Molecular Hammer
Biophysical Journal
; ABSTRACT In the current understanding of exocytosis at the nerve terminal, the C2 domain of synaptotagmin (C2A) is presumed to bind Ca^sup 2+^ and the membrane in a stepwise fashion: cation then membrane as cation increases the affinity of protein for membrane. Fluorescence spectroscopy data were
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Effects of Intracellular and Extracellular Concentrations of Ca^sup 2+^, K+, and Cl- on the Na+-Dependent Mg^sup 2+^ Efflux in Rat Ventricular Myocytes
Biophysical Journal
; ABSTRACT Intracellular Mg^sup 2+^ concentration ([Mg^sup 2sub i^) was measured in rat ventricular myocytes with the fluorescent indicator furaptra (25C). After the myocytes were loaded with Mg^sup 2 the initial rate of decrease in [Mg^sup 2sub i^ (initial Δ[Mg^sup 2sub i916;t) was estimated
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Respiratory Carbon Metabolism following Illumination in Intact French Bean Leaves Using ^sup 13^C/^sup 12^C Isotope Labeling1
Plant Physiology
; The origin of the carbon atoms in the CO2 respired by French bean (Phaseolus vulgaris) leaves in the dark has been studied using ^sup 13^C/^sup 12^C isotopes as tracers. The stable isotope labeling was achieved through a technical device that uses an open gas-exchange system coupled online to an
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^sup 123^I-ITdU-Mediated Nanoirradiation of DNA Efficiently Induces Cell Kill in HL60 Leukemia Cells and in Doxorubicin-, [beta]-, or [gamma]-Radiation-Resistant Cell Lines
The Journal of Nuclear Medicine
; Resistance to radiotherapy or chemotherapy is a common cause of treatment failure in high-risk leukemias. We evaluated whether selective nanoirradiation of DNA with Auger electrons emitted by 5-^sup 123^I-iodo-4'-thio-2'-deoxyuridine (^sup 123^I-ITdU) can induce cell kill and break resistance to
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Extracellular Ca^sup 2+^ Ameliorates NaCl-Induced K+ Loss from Arabidopsis Root and Leaf Cells by Controlling Plasma Membrane K+-Permeable Channels1
Plant Physiology
; Calcium can ameliorate Na+ toxicity in plants by decreasing Na+ influx through nonselective cation channels. Here, we show that elevated external [Ca^sup 2 also inhibits Na+-induced K+ efflux through outwardly directed, K+-permeable channels. Noninvasive ion flux measuring and patch-clamp
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