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from article Nanostructure

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Optical properties of cadmium sulfide (CdS) cluster assemblages. (a) Optical absorption spectra of CdS clusters in sodalite cages of zeolite Y for two different loadings compared to that for bulk CdS (micrometer size). (b) Cage structure of zeolite…

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from article Vacuole

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Vacuoles are important membrane-bound intracellular compartments. (Left) Protozoan vacuoles serve a variety of functions. For example, contractile vacuoles are involved in osmoregulation, controlling the excretion of water from the cell. The food…

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from article Vacuole

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A large lipid vacuole surrounded by a mantle of multinucleated giant cells. This type of vacuole occurs in exogenous lipid (lipoid) pneumonia, which is caused by inhalation or aspiration of a fatty substance. (Credit: Yale Rosen)

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from article Plant hormone

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Plant hormones, such as gibberellins, are chemical messengers synthesized within plants, where they help to regulate a variety of physiological processes, including growth, differentiation, and development. The stunted plant on the left lacks…

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from article Plant hormone

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Five of the most important plant hormones: auxin (indoleacetic acid; IAA), gibberellin (gibberellic acid; GA3), cytokinin (zeatin), abscisic acid, and ethylene. (Copyright © McGraw-Hill Education)

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from article Plant hormone

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A simplified view of the interaction of three branching hormones. (Left) Auxin promotes production of strigolactones (SL), while limiting that of cytokinins (CK) at bud nodes. This blocks bud outgrowth in intact plants. (Right) After decapitation,…

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from article Plant hormone

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The plant hormone ethylene initiates a signal transduction cascade that activates the transcription of a suite of genes needed for fully developed, ripe fruits and vegetables. The top illustration shows a normal path of ethylene synthesis leading to…

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from article Plant hormone

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Auxin transport within a plant takes place in a cell-to-cell fashion, mainly in the vascular cambium and the procambial strands, but probably also in epidermal cells. Transport to the root probably involves the phloem. The transport mechanism…

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from article Electron paramagnetic resonance (EPR) spectroscopy

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Powder and single-crystal EPR spectra due to Cu2+ ions in calcium cadmium acetate hexahydrate at room temperature. The single-crystal spectra, with the magnetic field making angles of 0°, 30°, 60°, and 90° with the symmetry axis (//), illustrate…

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from article Electron paramagnetic resonance (EPR) spectroscopy

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Room-temperature solution spectrum of the betaine free-radical cation in toluene at a microwave frequency of 9.28877 GHz. The spectrum would be more symmetric at higher microwave frequencies. (Courtesy of Dr. G. R. Hanson)

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