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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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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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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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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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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 cell‐specific inhibition of the potato sucrose transporter SUT1
Plant, Cell & Environment, 1996ABSTRACTIn many plants, translocation of sucrose from mesnsophyll to phloem for long‐distance transport is carrier‐mediated. The sucrose H+‐symporter gene SUT1 from potato is expressed at high levels in the phloem of mature, exporting leaves and at lower levels in other organs.
Kühn, C. +5 more
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The rendez-vous of mobile sieve-element and abundant companion-cell proteins
Current Opinion in Plant Biology, 2018Thousands of sieve tube exudate proteins (STEP) have now been identified and predicted to fulfill a diversity of functions. However, most STEPs should be considered putative, since methods to collect sieve tube exudates have many technical drawbacks, and advanced functional characterization will be required to distinguish contaminant from bonafide ...
de Marco, Federica +2 more
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Immune Reconstitution With Activated T Cells In Companion Canines With Lymphoma
Blood, 2013Abstract Companion canine cancer provides a clinically-relevant immunotherapy model for human malignancies because of their large size, intra-species genetic diversity, genetic similarity of tumors to human oncology, and spontaneously occurring tumors that develop despite an intact immune system ...
Colleen M. O'Connor +9 more
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