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How can protoxylem be supportive if the vessel elements have only periodically-thickened secondary cell wall?
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What is plant plumbing?
Water pipes, formed by the walls of dead cells, ensure the efficient transport of water and solutes in the xylem of vascular plants. In elongating plant organs such as the hypocotyl, which lifts the growing tip of the germinating seedling out of the soil, the passive elongation of dead and empty protoxylem elements by surrounding live tissue maintains a functional water-conducting system. Now, Ulrich Ryser and co-workers use confocal laser scanning microscopy to investigate a new structural element in the cell wall of protoxylem cells in hypocotyls . This structural element, which contains glycine-rich proteins , is initially deposited in the corners of cells along the longitudinal axis of the protoxylem, where it is associated with the pectin polysaccharide rhamnogalacturonan I. The authors show that the polysaccharide-rich wall of living and elongating protoxylem is gradually replaced by GRP-containing cell wall material, which develops into a complicated 3D network that seems to stabilize the protoxylem. They also report that GPR-related sequences are found in many seed plants, leading them to suggest that GRP-rich walls originated early in seed plant evolution.
How can you obtain Al-k alpha radiation?
K alpha and L alpha are secondary radiation lines that are peculiar to a given element bombarded with radiation (Xray tube). When you radiate an element, it gives off secondary radiation measured as K alpha and L alpha lines. This secondary radiation is given off at an angle peculiar to the element being radiated. Hence one is able to analyse a mineral ore sample for wanted elements by setting up radiation detectors at the various angles peculiar to the elements being sort. This process is used in auto-assay equipment used by mining companies wanting to reduce the time it takes to analyse samples chemically.
What are six most important elements for organisms?
1. Sun 2. Producers 3. Abiotic substances 4. Primary consumers 5. Secondary consumers(predators) 6. decomposers ELLAINE ^_^
Does transmutation help in making a hydrogen bomb?
Transmutation occurs when a fusion bomb (H-bomb) detonates: The Primary (A-bomb/fission) converts a heavy element like plutonium or uranium into lighter elements, such as strontium, etc... The Secondary (H-bomb/fusion part) converts a light element into heavier elements, like Hydrogen into Helium.
Are there more elements or non-elements?
Non-elements. There are only around 118 known elements, there are millions of compounds made of those elements.
What are Secondary elements?
Plant, Ice, Lava, and Storm
What is plant plumbing?
Water pipes, formed by the walls of dead cells, ensure the efficient transport of water and solutes in the xylem of vascular plants. In elongating plant organs such as the hypocotyl, which lifts the growing tip of the germinating seedling out of the soil, the passive elongation of dead and empty protoxylem elements by surrounding live tissue maintains a functional water-conducting system. Now, Ulrich Ryser and co-workers use confocal laser scanning microscopy to investigate a new structural element in the cell wall of protoxylem cells in hypocotyls . This structural element, which contains glycine-rich proteins , is initially deposited in the corners of cells along the longitudinal axis of the protoxylem, where it is associated with the pectin polysaccharide rhamnogalacturonan I. The authors show that the polysaccharide-rich wall of living and elongating protoxylem is gradually replaced by GRP-containing cell wall material, which develops into a complicated 3D network that seems to stabilize the protoxylem. They also report that GPR-related sequences are found in many seed plants, leading them to suggest that GRP-rich walls originated early in seed plant evolution.
What are 3 major elements of education?
Madhyamik , higher secondary , graduate
The four elements of an ecosystem are?
Producers, Primary Consumers Secondary Consumers Tertiary Consumers
What are the 4 elements that make 95 percent of an organism?
i thinks it is primary secondary and terieary
What is the secondary steel making process?
It is a steel making stage in whice steel refined and different elements are added in it.
What are 3 elements in a storyboard?
Here are some:Introduction, Rising Action, Climax, Anti-Climax, Secondary Climax. Was this what you were looking for?
Which are the secondary sentences elements?
object direct object,indirect object,subject complement,bject complement,adverbial adjuncs
What has the author Adrian Augustus Holtz written?
Adrian Augustus Holtz has written: 'A study of the moral and religious elements in American secondary education up to 1800' -- subject(s): Religious education, Secondary Education
Why is hydogen unique?
Hydrogen is the only primordial element in the universe. All the other elements formed inside stars from hydrogen or from other secondary elements, by nuclear fusion. Hydrogen has the least number of protons in its nucleus of all the elements, and hence has the lowest atomic number, one.
What are the elements of the Caribbean Charter on health promotion?
The elements are: 1,Formulating public policy 2. Re-orienting health services 3'Empowering communities to achieve well being 4. Create supportive environment 5.Develop/increase personal health skills 6. Build alliances with special emphasis on the media
What has the author H R Breitenbach written?
H. R. Breitenbach has written: 'The introduction of new elements of knowledge into upper secondary education in Switzerland, 1971-75'
