Sieve Tube Elements
Sieve Tube Elements - Related Videos
14:16
A New Application of the Electrical Penetration Graph (EPG) for Acquiring and Measuring Electrical Signals in Phloem Sieve Elements
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Cited by 24 •
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Electrical Penetration Graph (EPG) is a well-established technique for studying the feeding behavior of stylet-bearing insects. Here we show a new application of EPG as a non-invasive tool for the acquisition of intracellular electrophysiology recordings of sieve elements (SEs), the cells that form the phloem vasculature in plants.
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Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes
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Cited by 3 •
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This protocol describes the study of the quasi-static compression performance of corrugated tapered tubes using finite element simulations. The influence of the thickness gradient on the compression performance was investigated. The results show that proper thickness gradient design can change the deformation mode and significantly improve the energy absorption performance of the tubes.
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Periodic Classification of the Elements
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The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
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Sieve Analysis and Grading Curves
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2024
Sieve analysis is a method used to determine the particle size distribution of aggregate materials. This process involves the following steps: The required quantity of dried sample of aggregate is weighed. The weighed aggregates are sieved through a set of sieves with square openings arranged in descending order of aperture size, with the largest mesh on top (Column 1 of Table 1). The stack of sieves is shaken or vibrated to facilitate the sorting of particles by size. After sieving for a...
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Classification of Elements and Compounds
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2020
Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units. Compounds are pure substances composed of two or more elements in fixed, definite proportions. Compounds are classified as ionic or molecular (covalent) based on the bonds...
FAQs
Companion cells provide the metabolic support that mature sieve tube elements can no longer supply independently. Because these conducting cells lose their nucleus and most organelles, their continued function depends on this neighboring cellular partnership. The arrangement allows the sieve tube to remain an effective pathway for long-distance movement while retaining a specialized structure for phloem transport.
Perforated sieve plates connect adjacent sieve tube elements end to end, creating a continuous pathway through the phloem. Their position between neighboring cells allows transported sugars and other organic solutes to move along the length of the plant rather than stopping at individual cell boundaries. This cellular arrangement is essential for long-distance translocation.
Pressure differences provide the driving force for mass flow through the sieve tube. Photosynthetic leaves act as source tissues, while roots, fruits, seeds, and growing regions function as sink tissues that receive transported organic solutes. The resulting source-to-sink movement distributes materials from tissues producing or releasing them to regions requiring them.
They form the long-distance route linking photosynthetic leaves with roots, fruits, seeds, and growing regions. Organic solutes can therefore move beyond the tissue where they are associated with photosynthesis and reach organs involved in growth or storage. This connection helps coordinate resource distribution throughout the vascular plant.
Transport through these cells supports several whole-plant functions, including growth, storage, signaling, and responses to phloem-feeding pests. Movement between source and sink tissues ensures that organic solutes reach developing or storing organs, while the same phloem network contributes to communication and interactions with organisms that feed from it.
Phloem-feeding pests interact with the transport network that distributes sugars and other organic solutes through the plant. Sieve tube elements are therefore relevant to understanding how feeding relates to vascular transport, plant signaling, and defensive responses. Their role connects the biology of the pest with processes occurring between leaves, storage organs, roots, and growing tissues.