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Plastids in sieve elements and companion cells of Tilia americana
Planta, 1971Contrary to an earlier report, the sieve elements and companion cells of Tilia americana contain plastids. In young sieve elements and companion cells the plastids contain a moderately electronopaque matrix and internal membranes; the latter are very numerous in the plastids of the sieve elements.
R F, Evert, B P, Deshpande
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Nanoparticles and cells: good companions and doomed partnerships
Organic & Biomolecular Chemistry, 2007Engineered nanoparticles are emerging as useful tools for different purposes in life sciences, medicine and agriculture. Nanomedicine, an emerging discipline, involves the application of nanotechnology (usually regarded within the size range of 1-1000 nm) in the design of systems and devices that can facilitate our understanding of disease ...
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Sclerified Companion Cells in Tilia americana
Botanical Gazette, 1963Preliminary examination of the secondary phloem of Tilia americana has revealed the infrequent occurrence of sclerified companion cells in the non-functional phloem.
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Plant Molecular Biology, 2008
In solanaceous plants such as tomato and tobacco, the sucrose transporter SUT1 is crucial for phloem loading. Using GUS as a reporter, the promoter and other regulatory cis elements required for the tomato LeSUT1 expression were analyzed by heterologous expression of translational chimeric constructs in tobacco.
Andreas, Weise +4 more
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In solanaceous plants such as tomato and tobacco, the sucrose transporter SUT1 is crucial for phloem loading. Using GUS as a reporter, the promoter and other regulatory cis elements required for the tomato LeSUT1 expression were analyzed by heterologous expression of translational chimeric constructs in tobacco.
Andreas, Weise +4 more
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Companion Cells and Transfer Cells
1975Phloem tissue as a whole, according to the introduction of this term by Nageli (1858), consists of sieve elements, sclerenchymatic elements and parenchymatic elements. Companion cells and transfer cells, the two cell types to be considered more in detail in the following, belong to the latter group.
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Intercommunication between mammalian oocytes and companion somatic cells
BioEssays, 1991AbstractCellular interactions in the mammalian ovarian follicle between its germ‐line and somatic cell components are crucial for its development and function. These interactions are mediated by both membrane gap junctions and paracrine factors. Somatic cell‐to‐oocyte communication is essential for oocyte growth and the regulation of meiotic maturation.
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