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Holdfast (biology), Holdfast
Holdfast most often refers to: *Holdfast (biology), a root-like structure that anchors aquatic sessile organisms to their substrate *Holdfast (tool), a tool used to secure a workpiece to a workbench or anvil Holdfast or hold fast may also refer to: Places * Holdfast, Worcestershire, a village in the Malvern Hills District in England * Holdfast, Saskatchewan, a village in Canada Arts and entertainment Music * Hold Fast (album), ''Hold Fast'' (album), a 2012 album, or the title song, by the Crookes * ''Hold Fast: Acoustic Sessions'', a 2018 album by Face to Face * ''Hold Fast'', a 2020 album by Stick in the Wheel * Hold Fast (song), "Hold Fast" (song), a 2006 song by MercyMe * "Hold Fast", a 2010 song by Honor Bright from ''Action! Drama! Suspense!'' Other media * ''Hold Fast'', a travel documentary film by Moxie Marlinspike * ''Holdfast: Nations at War'', a video game set during the Napoleonic Wars; see Napoleonic Wars in fiction Other uses * Hold Fast, the motto of the Clan Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holdfast (biology)
A holdfast is a root-like structure that anchors aquatic sessile organisms, such as seaweed, other sessile algae, stalked crinoids, benthic cnidarians, and sponges, to the substrate. Holdfasts vary in shape and form depending on both the species and the substrate type. The holdfasts of organisms that live in muddy substrates often have complex tangles of root-like growths. These projections are called haptera and similar structures of the same name are found on lichens. The holdfasts of organisms that live in sandy substrates are bulb-like and very flexible, such as those of sea pens, thus permitting the organism to pull the entire body into the substrate when the holdfast is contracted. The holdfasts of organisms that live on smooth surfaces (such as the surface of a boulder) have flattened bases which adhere to the surface. The organism derives no nutrition from this intimate contact with the substrate, as the process of liberating nutrients from the substrate requires ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holdfast (tool)
A holdfast or hold fast is a form of temporary clamp used to hold a workpiece firmly to the top or side of a wooden workbench or the top of an anvil. A form of bench dog, a traditional holdfast has either a curved or flat top. Its shank is slid loosely into a “dog” hole in the bench or anvil until the tip of its hook touches the work. It is set by hitting its top with a mallet or hammer, which causes the shaft to wedge tightly against the sides of the hole. A tap of its back side near the top releases it. Contemporary holdfasts are commonly designed to fit in holes, somewhat narrower than had been traditional. Scrap pieces of wood or leather are often used between the holdfast and the workpiece to prevent marring it. An adaptation of the holdfast is threaded, sometimes known as a “screwdown”, which is tightened rather than tapped in place. History Based on a fresco discovered in the ruins of Herculaneum, holdfasts are known to have been in use since at least the 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holdfast, Worcestershire
Holdfast is a civil parish in the Malvern Hills District of the county of Worcestershire, England. It is one of three administered by the Parish Council of Longdon, Queenhill and Holdfast. It lies on the west bank of the River Severn immediately to the south of Upton upon Severn Upton-upon-Severn (or Upton on Severn, etc. and locally simply Upton) is a town and civil parish in the Malvern Hills District of Worcestershire, England. Lying on the A4104 (formerly A440), the 2011 census recorded a population of 2,881 for the .... References Hamlets in Worcestershire Civil parishes in Worcestershire Malvern Hills District {{Worcestershire-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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