Vessel element
Saturday, July 19, 2008
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Jump to: navigation, search
SEM image (top) and Transmission Light Microscope image (bottom) of pores in Oak
A vessel element is one of the cell types found in xylem, the water conducting tissue of plants. Vessel elements are typically found in the angiosperms but absent from most gymnosperms such as the conifers.
Vessel elements are the building blocks of vessels, which constitute the major part of the water transporting system in the plants where they occur. Vessels form an efficient system for transporting water (including necessary minerals) from the root to the leaves and other parts of the plant.
In secondary xylem, a vessel element originates from a fusiform initial in the cambium, at maturity the protoplast dies and disappears, but the lignified cell walls persist. It may be seen as a dead cell, which still has a function, and is still being protected by surrounding living cells.
The cell wall is strongly lignified. At both ends there are openings that connect the individual vessel elements. These are called perforations or perforation plates. These perforations may have a variety of shapes: the most common are the simple perforation (a simple opening) and the scalariform perforation (several elongated openings on top of each other in a ladder-like design). Other types include the foraminate perforation plate (several round openings) and reticulate perforation plate (net-like pattern, with many openings). The side walls will have pits, and may have spiral thickenings.
posted by whistleblower at 9:40 PM 0 Comments
Thursday, July 10, 2008
Vessel
From Wikipedia, the free encyclopedia
Jump to: navigation, search
Look up vessel in Wiktionary, the free dictionary.Vessel may refer to:
a boat, ship or starship
liquid or food vessel, such as a pitcher, bowl, cup or bottle
other kinds of packaging containers
a tubular structure of vascular tissue in plants such as xylem and phloem
Vessel may also refer to:
Blood vessel, a part of the circulatory system and function to transport blood throughout the body
Lymph vessel, a thin walled, valved structure that carries lymph
Vessel element, a cell type found in xylem
Pressure vessel, a closed, rigid container designed to hold gases or liquids at a pressure different from the ambient pressure
Vacuum vessel, a pressure vessel where the pressure inside the vessel is lower than the ambient pressure
Vessel (song), a song by Nine inch nails.
Vessel (band), a Black Metal band from California.
posted by whistleblower at 1:48 AM 0 Comments
Sunday, June 22, 2008
Hackers Intercept Comcast Web Site
CRN - 5 hours ago
By Stefanie Hoffman, ChannelWeb Hackers hijacked the Comcast Website Thursday, rerouting site traffic, shutting down service and preventing millions of users from accessing e-mail or posting content for more than five hours.
Comcast lost control of its Web site domain for several hours. GameSHOUT
Comcast.com hackers just goofy stoners CrunchGear
PC World - Dark Reading - DailyTech - ZDNet Blogs
all 236 news articles ?
posted by whistleblower at 7:26 AM 0 Comments
Wednesday, June 11, 2008
How Ceramic vessel sink Are Made
Pottery is made by a blend of clays, fillers and fluxes being fused together during the firing process. A white or coloured glaze is applied and is fused chemically and physically to the clay body during the same firing process. The finished vessel sink (vitreous china) has a very hard surface and is resistant to fading, staining, burning, scratching and acid attack. Due to the firing process and natural clays used, it is normal for the product to vary in size and shape, and +/- 5mm is normal.
posted by whistleblower at 6:16 PM 0 Comments
From Wikipedia, the free encyclopedia
Jump to: navigation, search
SEM image (top) and Transmission Light Microscope image (bottom) of pores in Oak
A vessel element is one of the cell types found in xylem, the water conducting tissue of plants. Vessel elements are typically found in the angiosperms but absent from most gymnosperms such as the conifers.
Vessel elements are the building blocks of vessels, which constitute the major part of the water transporting system in the plants where they occur. Vessels form an efficient system for transporting water (including necessary minerals) from the root to the leaves and other parts of the plant.
In secondary xylem, a vessel element originates from a fusiform initial in the cambium, at maturity the protoplast dies and disappears, but the lignified cell walls persist. It may be seen as a dead cell, which still has a function, and is still being protected by surrounding living cells.
The cell wall is strongly lignified. At both ends there are openings that connect the individual vessel elements. These are called perforations or perforation plates. These perforations may have a variety of shapes: the most common are the simple perforation (a simple opening) and the scalariform perforation (several elongated openings on top of each other in a ladder-like design). Other types include the foraminate perforation plate (several round openings) and reticulate perforation plate (net-like pattern, with many openings). The side walls will have pits, and may have spiral thickenings.
posted by whistleblower at 9:40 PM 0 Comments
Thursday, July 10, 2008
Vessel
From Wikipedia, the free encyclopedia
Jump to: navigation, search
Look up vessel in Wiktionary, the free dictionary.Vessel may refer to:
a boat, ship or starship
liquid or food vessel, such as a pitcher, bowl, cup or bottle
other kinds of packaging containers
a tubular structure of vascular tissue in plants such as xylem and phloem
Vessel may also refer to:
Blood vessel, a part of the circulatory system and function to transport blood throughout the body
Lymph vessel, a thin walled, valved structure that carries lymph
Vessel element, a cell type found in xylem
Pressure vessel, a closed, rigid container designed to hold gases or liquids at a pressure different from the ambient pressure
Vacuum vessel, a pressure vessel where the pressure inside the vessel is lower than the ambient pressure
Vessel (song), a song by Nine inch nails.
Vessel (band), a Black Metal band from California.
posted by whistleblower at 1:48 AM 0 Comments
Sunday, June 22, 2008
Hackers Intercept Comcast Web Site
CRN - 5 hours ago
By Stefanie Hoffman, ChannelWeb Hackers hijacked the Comcast Website Thursday, rerouting site traffic, shutting down service and preventing millions of users from accessing e-mail or posting content for more than five hours.
Comcast lost control of its Web site domain for several hours. GameSHOUT
Comcast.com hackers just goofy stoners CrunchGear
PC World - Dark Reading - DailyTech - ZDNet Blogs
all 236 news articles ?
posted by whistleblower at 7:26 AM 0 Comments
Wednesday, June 11, 2008
How Ceramic vessel sink Are Made
Pottery is made by a blend of clays, fillers and fluxes being fused together during the firing process. A white or coloured glaze is applied and is fused chemically and physically to the clay body during the same firing process. The finished vessel sink (vitreous china) has a very hard surface and is resistant to fading, staining, burning, scratching and acid attack. Due to the firing process and natural clays used, it is normal for the product to vary in size and shape, and +/- 5mm is normal.
posted by whistleblower at 6:16 PM 0 Comments
posted by whistleblower at
2:17 AM 0 Comments 
