Results 201 to 210 of about 21,195 (259)

Method to Predict Salt Expansion Deformation in Cement-Stabilized Macadam Under Sulfate Attack Based on Pore Evolution. [PDF]

Materials (Basel)
Li X, Mao X, He P, Wu Q.
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Stationary sieve element proteins

Journal of Plant Physiology, 2021
Vascular plants use the phloem to move sugars and other molecules from source leaves to sink organs such as roots and fruits. Within the phloem, enucleate sieve elements provide the low-resistance pipe system that enable bulk flow of sap. In this review, we provide an overview of the highly specific protein machinery that localize to mature sieve ...
Niels Christian Sanden, Alexander Schulz
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Foliar sieve elements: Nexus of the leaf

Journal of Plant Physiology, 2022
In this review, a central position of foliar sieve elements in linking leaf structure and function is explored. Results from studies involving plants grown under, and acclimated to, different growth regimes are used to identify significant, linear relationships between features of minor vein sieve elements and those of 1) leaf photosynthetic capacity ...
William W. Adams III, Jared J. Stewart, Stephanie K. Polutchko, Barbara Demmig-Adams   +3 more
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Aphid activities during sieve element punctures

Entomologia Experimentalis et Applicata, 1994
AbstractAphid salivation in sieve elements and phloem sap ingestion were linked to waveforms in the Electrical Penetration Graph (EPG). Non‐viruliferous Rhopalosiphum padi (L.) (Hemiptera, Aphididae) on barley yellow dwarf virus (BYDV) infected wheat could acquire the virus, which was used as an indication for phloem sap ingestion, whereas virus ...
Prado, E., Tjallingii, W.F.
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Sieve elements caught in the act

Trends in Plant Science, 2002
Phloem is a puzzling plant tissue owing to the unique natural defence responses of the sieve elements to any kind of mechanical manipulation. Recent non-invasive studies have enabled real-time observation of events in intact sieve tubes, including mass transport, sieve-pore sealing and conformational changes of structural proteins.
Aart J E, van Bel, Katrin, Ehlers, Michael, Knoblauch   +2 more
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CALLOSE SUBSTANCE IN SIEVE ELEMENTS

American Journal of Botany, 1964
The secondary phloem of 6 species of woody dicotyledons was examined for the occurrence of callose on the sieve plates of active sieve elements. Fluorescence and bright‐field staining methods were used to detect callose. Tissue from the 6 species was killed and fixed in each of 5 solutions.
Ray F. Evert, William F. Derr
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PHLOEM UNLOADING: Sieve Element Unloading and Post-Sieve Element Transport

Annual Review of Plant Physiology and Plant Molecular Biology, 1997
▪ Abstract  The transport events from the sieve elements to the sites of utilization within the recipient sink cells contribute to phloem unloading. The phenomenon links sink metabolism and/or compartmentation with phloem transport to, and partitioning between, sinks.
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Sieve–element characters

Nordic Journal of Botany, 1981
Of all the ultrastructural features recognized within sieve elements their specific plastids provide the most successful characters in seed plant systematics. Sieve–element plastids are classified into subtypes and forms according to their protein and starch contents. Presently 26 different forms grouped into six subtypes within the two basic types (S–
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Sieve element pores in Nicotiana pith culture

Journal of Ultrastructure Research, 1970
Sieve elements were induced to form in cultured pith cylinders of Nicotiana tabacum L. (var. Wisconsin 38). Both xylem and phloem differentiate in isolated nodules at the periphery of the cylinders. The mature sieve elements closely resemble sieve elements in intact plants but are more irregular in shape and usually not highly elongated.
R, Anderson, J, Cronshaw
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