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Topic: Basal cleavage

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	Cleavage (crystal) - Wikipedia, the free encyclopedia
		Basal cleavage: cleavage parallel to the base of a crystal, or to the plane of the lateral axes.
		Octahedral, Dodecahedral, or Rhombohedral cleavage: cleavage parallel to the faces of an octahedron, dodecahedron, or rhombohedron (respectively).
		Prismatic cleavage, cleavage parallel to a vertical Prism.
	en.wikipedia.org /wiki/Cleavage_(crystal) (295 words)

	FanFiction.Net : Dictionary & Thesaurus (Site not responding. Last check: 2007-10-25)
		[1913 Webster] Basal cleavage, cleavage parallel to the base of a crystal, or to the plane of the lateral axes.
		Diagonal cleavage, cleavage parallel to ta diagonal plane.
		Octahedral cleavage, Dodecahedral cleavage, or Rhombohedral cleavage, cleavage parallel to the faces of an octahedron, dodecahedron, or rhombohedron.
	www.fanfiction.net /dictionary.php?word=cleavage (172 words)

	Mineral Gallery - the property of CLEAVAGE
		Cleavage is said to be basal when it occurs perpendicular to the major axis of the mineral and prismatic when it occurs parallel to the major axis.
		Multiple cleavages that produce geometric polygons are referred to using the name of the geometric polygon, such as octahedral cleavage in the mineral fluorite, cubic cleavage in the mineral halite or rhombohedral cleavage in calcite (pictured).
		To identify cleavage in a mineral remember that it is always parallel to a possible crystal face, it is reproducible over and over again and that it may be seen as internal reflection planes.
	mineral.galleries.com /minerals/property/cleavage.htm (682 words)

	Analysis of Escherichia coli RecA Interactions with LexA, lambda CI, and UmuD by Site-Directed Mutagenesis of recA -- ...
		Cleavage fragments are not shown; their levels are uninformative, since LexA cleavage fragments are unstable (27) (for an example, cf.
		The fact that the amount of basal cleavage did not correlate with the amount of RecA suggests that the extent of basal cleavage was limited by the amount of signal in the cell and/or by the ability of RecA protein to become activated by it.
		Basal cleavage complicates the interpretation of mutant phenotypes.
	jb.asm.org /cgi/content/full/182/6/1659 (7300 words)

	Highbeam Encyclopedia - Search Results for Basal
		The most common types of skin cancer are basal cell carcinoma, squamous cell carcinoma, and melanoma.
		The small, dandelionlike flower heads are borne in clusters at the top of a long, hairy stem; the basal leaves are also hairy.
		Diagnosis and treatment of basal cell and squamous cell carcinomas.
	www.encyclopedia.com /SearchResults.aspx?Q=Basal (649 words)

	Mica (Site not responding. Last check: 2007-10-25)
		The mica group of minerals includes several closely related materials having highly perfect basal cleavage.
		The highly perfect cleavage, which is the most prominent characteristic of mica, is explained by the hexagonal sheet-like arrangement of its atoms.
		The word "mica" is thought to be derived from the Latin word micare, meaning to shine, in reference to the brilliant appearance of this mineral (especially when in small scales).
	www.ebroadcast.com.au /lookup/encyclopedia/mi/Mica.html (82 words)

	Put_Your_Title_Here (Site not responding. Last check: 2007-10-25)
		Basal bodies are associated with a ribosome-free zone adjacent to the nuclear membrane.
		At the initiation of the second division, basal bodies are present at the incipient cleavage furrow.
		By metaphase II, the basal bodies migrate to the poles of the fenestrated spindle.
	www.botany.utexas.edu /facstaff/facpages/mbrown/papers/63.htm (209 words)

	Chapter Cleavable <i>to</i> Clever of C by Webster's Dictionary (1913 Edition)
		cleavage parallel to the base of a crystal, or to the plane of the lateral axes.
		cleavage parallel to the faces of a cube.
		cleavage parallel to the faces of an octahedron, dodecahedron, or rhombohedron.
	www.bibliomania.com /2/3/257/1194/22210/1.html (237 words)

	Cell Surface Ectodomain Cleavage of Human Amphiregulin Precursor Is Sensitive to a Metalloprotease Inhibitor. RELEASE ...
		Cleavage of the AR ectodomain is stimulated by PMA and inhibited by the metalloprotease inhibitor, batimastat.
		AR Ectodomain Cleavage Is Stimulated by PMA and Inhibited by Batimastat-- To characterize further the release of AR from the cell surface, we performed cold biotinylation chase experiments.
		The basal rate of cleavage of the pro-AR doublet appears to be slower than for the 50-kDa AR form, thereby increasing the cell surface half-life of the doublet.
	www.jbc.org /cgi/content/full/273/27/17258 (8225 words)

	Interactive Fly, Drosophila
		Proteolytic cleavage of Dl by Kul represents a general mechanism for refining and maintaining the asymmetric distribution of Dl, in cases where transcriptional repression of Dl expression does not suffice to eliminate Dl protein (Sapir, 2005).
		When Dl alone was expressed in the cells, basal cleavage by endogenous proteases was detected by an accumulation of the cleaved form of Dl in the medium.
		The constitutive cleavage of Dl by Kul is therefore a crucial safeguard, continuously removing low levels of Dl that have escaped transcriptional repression (Sapir, 2005).
	www.sdbonline.org /fly/neural/kuzban2.htm (7305 words)

	geodes alicatsrocks mineral terms
		cleavage - The tendency of certain minerals to break along distinct planes in their crystal structures where the bonds are weakest.
		Cleavage is tested by striking or hammering a mineral, and is classified by the number of surfaces it produces and the angles between adjacent surfaces.
		The micas are soft and have perfect basal cleavage, and can be seen when a mica is "peeled".
	alicatsrocks.com /Amineralterms.htm (5063 words)

	Minerals and Mining Statistics On-Line - Mica
		However, it is actually a term for a group of 29 phyllosilicate minerals with perfect basal cleavage.
		This perfect cleavage, due to weak bonding between mica layers, results in it breaking or “peeling” in sheets.
		The perfect cleavage for which this group is known may cause it to be damaged when handled.
	mmsd1.mms.nrcan.gc.ca /mmsd/producers/factsheets/mica_e.asp (581 words)

	[No title] (Site not responding. Last check: 2007-10-25)
		] Cleavage parallel to the base of the crystal structure or to the lattice plane which is normal to one of the lattice axes.
		] The expanded basal portion of the stalk of certain sessile organisms, used for attachment to the substrate.
		] The basal portion of the endometrium; it is not shed during menstruation.
	www.accessscience.com /Dictionary/B/B7/DictB7.html (2402 words)

	How To Identify Minerals: Cleavage (Site not responding. Last check: 2007-10-25)
		When a mineral sample is broken with a hammer, it breaks along planes of weakness that are part of its crystalline structure.
		Basal cleavages occur along a single plane parallel to the base of the mineral (example, topaz).
		As the quality of the break decreases, cleavage may be described as good, distinct, and poor or none.
	www.sdnhm.org /kids/minerals/howto-cleavage.html (115 words)

	Gems in Brief, K-N
		Cleavage is perfect, fracture uneven, with a hardness of 6-6.5 and density 2.65-2.75.
		The cleavage is one-directional and it occurs as sheets or tiny flakes.
		Cleavage of pyrite is very indistinct and a conchoidal fracture is common.
	www.emporia.edu /earthsci/amber/go340/gb2.htm (1586 words)

	About Mica - MICAMAFCO (Site not responding. Last check: 2007-10-25)
		, eminently perfect basal cleavage, affording thin tough laminae or scales, colorless to jet fl, transparent to translucent, of widely varying chemical composition, and crystallising in the monoclinic system".
		In brief, mica is a generic term applied to a group of a complex aluminosilicate minerals having a sheet or plate like structure with different chemcial compositions and physical properties.
		All micas from from flat six-sided monoclinical crystals with a remarkable cleavage in the direction of the large surfaces,which permits them to split easily into optically flat films, as thin as one micron in thickness.
	www.micamafco.com /mica.htm (403 words)

	Trastuzumab (Herceptin), a Humanized Anti-HER2 Receptor Monoclonal Antibody, Inhibits Basal and Activated HER2 ...
		Cultures were incubated with 2C4 or with trastuzumab for 2 h in 0.3 ml of serum-free medium, which was afterward concentrated to 50 µl and analyzed by Western blot.
		Serum-free medium containing APMA and/or trastuzumab was added to cultures; and after 15 min, cells were lysed and medium (50 µl) and lysates (100 µg in the case of SK-BR-3 and 20 µg for BT-474 cells) were subjected to Western blot analysis.
		Codony-Servat J., Albanell J., Lopez-Talavera J. C., Arribas J., Baselga J. Cleavage of the HER2 ectodomain is a pervanadate-activable process that is inhibited by the tissue inhibitor of metalloproteases TIMP-1 in breast cancer cells.
	cancerres.aacrjournals.org /cgi/content/full/61/12/4744 (5931 words)

	Regulated Expression of nullo Is Required for the Formation of Distinct Apical and Basal Adherens Junctions in the ...
		The basal junction is established as a distinct domain during early cellularization.
		a basal junction is the primary defect in nullo mutant embryos.
		At the onset of gastrulation, the basal junction
	www.jcb.org /cgi/content/full/150/2/391 (6121 words)

	Textures of Metamorphic Rocks
		As metamorphism proceeds, the sheet structure silicates (flat minerals with basal cleavage) such as mica (biotite and muscovite) and chlorite start to grow.
		In the link to slaty cleavage we can see how the cleavage does not run parallel to the bedding.
		However, the slaty cleavage produces a very distinct layering in the rock that often runs at an angle to the bedding.
	csmres.jmu.edu /geollab/Fichter/MetaRx/Metatexture.html (757 words)

	The Mineral Topaz
		But this feature is undermined by the fact that is has perfect basal cleavage in one direction.
		Topaz has perfect cleavage in the 001 plane (which is the plane that is pierced through by c but not by a or b - in other words, the plane perpendicular to c).
		The mineral is also distinguished by the fact that its cleavage trace is parallel to the fast ray.
	mason.gmu.edu /~aweese/bookbag/geol302/index.htm (1562 words)

	OGReNET: Mineral Identification
		Cleavage is often the most difficult of the physical properties to identify.
		Light tends to be dispersed from fractured surfaces, whereas light tends to be reflected in a planar fashion from a cleaved surface.
		One direction of cleavage (basal) results in flake-shaped pieces and often a pearly lustre.
	ontariogeoscience.net /lessonplans/mineral-properties.html (1892 words)

	GeoMan's Mineral and Rock Glossary
		The cleavage is important: Toss a deck of cards into the air and record how many land on the edges.
		Cleavage is further defined based upon its quality, with such modifiers as "perfect," "good," and "poor" used.
		A simple field method of distinguishing between shale (a sedimentary rock composed of Clay the Mineral) and slate (a metamorphic rock composed of interlocking grains of minerals with basal cleavage).
	jersey.uoregon.edu /~mstrick/MinRockID/MinRockGloss.html (1315 words)

	Cleavage
		If it breaks irregularly then it shows fracture, if it breaks along regular surfaces related to the crystal structure then it shows cleavage.
		This cleavage depends on weaknesses in the crystalline make-up of the mineral and is a diagnostic property which can reveal additional information about the mineral.
		Example: "cleavage-00" finds all minerals a basal* cleavage.
	webmineral.com /help/Cleavage.shtml (119 words)

	Roger 2
		It is soft (2.5 - 3.0) with prominent basal cleavage, a vitreous to greasy luster, and is silvery-fl in color.
		It is semi-hard (4 - 5), with rhombohedral cleavage, vitreous luster, and a white streak.
		It displays perfect basal cleavage with vitreous or pearly luster, and is a yellowish-brown color.
	www.webpages.uidaho.edu /~mgunter/geol249/latah/roger.html (18455 words)

	Topaz (Site not responding. Last check: 2007-10-25)
		It is orthorhombic[?] and its crystals are mostly prismatic terminated by pyramidal and other faces, the basal pinacoid often being present.
		It has an easy and perfect basal cleavage and so gemstones or other fine specimens should be handled with care to avoid developing cleavage flaws.
		Topaz has a hardness of 8, a specific gravity of 3.4-3.6, and a vitreous lustre.
	www.ebroadcast.com.au /lookup/encyclopedia/to/Topaz.html (222 words)

	Biotite
		It is a ferro-magnesian mineral that is fl and shiny with basal cleavage (one cleavage resulting in thin sheets).
		Sheets are stacked in alternating layers, resulting in the distinctive basal cleavage.
		In felsic and intermediate igneous rocks biotite may be confused with amphibole but biotite has flat, slick, shiny faces not broken by the numerous cleavages typical of amphibole.
	www.es.ucl.ac.uk /schools/Glossary/biotite.htm (147 words)

	EAS-100-51: Homework Crossword #1 - Minerals (Site not responding. Last check: 2007-10-25)
		Minerals which are common members of the layer silicates, characterized by basal cleavage.
		Type of luster which is never seen in transparent nor in translucent minerals.
		Basal (1-directional) cleavage, typically shown by ---- sheets of minerals.
	servercc.oakton.edu /~billtong/eas100/homewk01.htm (355 words)

	Delaware Geological Survey
		Cleavage is the tendency of some minerals to break along definite surfaces that are parallel to possible crystal faces, and provides a means of identifying these minerals.
		The pink feldspar has better cleavage than the white and often breaks into small perfect rhombohedrons.
		Beryllium is a rare element, and most granitic pegmatites do not contain beryl, however this occurrence is part of a group of beryl-bearing granitic rocks that have been identified in southern Chester and Delaware counties in Pennsylvania and northern New Castle county in Delaware.
	www.udel.edu /dgs/Education/woodlawn.html (930 words)

	Geoscience - Minerals - Chemical and physical properties of minerals - Properties of minerals used in identification
		Members of the mica group have one perfect basal cleavage, feldspars have two well-developed cleavages almost at right angles.
		Pyroxenes have two distinct cleavages at 90°, amphiboles have two distinct cleavages at 120°.
		This is usually expressed as the main body colour of the mineral, along with the intensity of this colour.
	www.amonline.net.au /geoscience/minerals/id.htm (828 words)

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