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Abbreviation for phosphotungstic acid hematoxylin.


1. A discoloration.
2. A pigment or dye used in coloring microscopic objects and tissues.
3. To apply pigment or dye to a tissue or microscopic object or tissue.

acid stain

A chemical used to stain the cytoplasmic or basic components of cells.

acid-fast stain

A stain used in bacteriology, esp. for staining Mycobacterium tuberculosis, Nocardia, and other species. A special solution of carbolfuchsin is used, which the organism retains in spite of washing with the decolorizing agent acid alcohol.
See: Ziehl-Neelsen method

basic stain

A chemical used to add pigment to the nuclear or acidic components of cells.

calcofluor white stain

A fluorescent stain used in microbiology to highlight fungi, including species of Pneumocystis.

Commission-Certified stain

A stain that has been certified by the Biological Stain Commission.

contrast stain

A stain used to color one part of a tissue or cell, unaffected when another part is stained by another color.

counter stain

See: counterstain

dental stain

A discoloration accumulating on the surface of teeth, dentures, or denture base material, most often attributed to the use of tea, coffee, or tobacco. Many stains contain calcium, carbon, copper, iron, nitrogen, oxygen, and sulfur. Stains may be intrinsic or extrinsic. Extrinsic stains of teeth can be removed, e.g, , by brushing, rinsing, or sonication. Intrinsic stains cannot be removed by these methods.

differential stain

In bacteriology, a stain such as Gram stain that enables one to distinguish different types of bacteria.

double stain

A mixture of two contrasting dyes, usually an acid and a basic stain.

Feulgen stain

See: Feulgen stain

Giemsa stain

See: Giemsa stain

Gram stain

See: Gram stain

hematoxylin-eosin stain

A widely used method of staining tissues for microscopic examination. It stains nuclei blue-black and cytoplasm pink.

intravital stain

A nontoxic dye that, when introduced into an organism, selectively stains certain cells or tissues. Synonym: vital stain

inversion stain

A basic stain that, when under the influence of a mordant, acts as an acid stain.

Jenner stain

See: Jenner stain

Leishman stain

See: Leishman, William Boog

metachromatic stain

A stain which causes cells or tissues to take on a color different from the stain itself.

Movat pentachrome stain

See: Movat pentachrome stain

neutral stain

A combination of an acid and a basic stain.

nonspecific stain

A dye added to a tissue specimen that binds to tissue indiscriminately, making it more difficult to distinguish one part from the next.

nuclear stain

A basic stain that colors cell nuclei, but does not stain structures in the cytoplasm.

Perls stain

See: Perls stain

phosphotungstic acid-hematoxylin stain

Abbreviation: PTAH
A histological stain that binds to proteins, used primarily to stain skeletal muscles and mitochondria. It is also used to identify glial cells in the central nervous system and fibrin.

port-wine stain

Nevus flammeus. See: nevus flammeus for illus.

special stain

A stain that highlights features of a cell or organism that cannot be readily identified with routine histological or microbiological staining techniques.

substantive stain

A stain that is directly absorbed by the tissues when they are immersed in the staining solution.

supravital stain

Stain that will color living cells or tissues that have been removed from the body.

tumor stain

In arteriography, an abnormally dense area in a radiographical image caused by the collection of contrast medium in the vessels. This may be a sign of neoplastic growth.

vital stain

Intravital stain.

Wright stain

See: Wright stain

phosphotungstic acid-hematoxylin stain

Abbreviation: PTAH
A histological stain that binds to proteins, used primarily to stain skeletal muscles and mitochondria. It is also used to identify glial cells in the central nervous system and fibrin.
See also: stain
References in periodicals archive ?
The Berenice and Ptah fields are located in the Faghur Basin along the same fault trend in the Khalda Offset Concession.
Ptah Allah el, a former Black Studies major, coined the time "Black Studies went to college and never came home.
The statues, depicting King Ramesses II seated alongside the gods Amon-Ra, Ra-Horachty, and Ptah, sit in the Abu Simbel Temple Complex southwest of Aswan.
Johnson's chapter three suggests that Amenhotep III took on the creative role of Ptah, perhaps as part of the jubilee.
One crucial thing I must say, the ability for Ptah to tell this story and remain objective, authentic and loyal to the audience, without taking sides requires skill and diplomacy.
The fragment belongs to the naos honoring the 12th Dynasty King Amenemhat I, who ruled 4,000 years ago, which is now in the Ptah temple of Karnak in Luxor.
16 is a rare example of a Ptolemaic-period votive statuette of the god Nefertum, who is both the son of the divinities Ptah and Sekhmet and, as such, part of the Memphite triad, but is also a symbol of solar regeneration.
Keep (Ithaca, NY: Cornell University Press, 1973), 146-150, argues Akhenaton introduced a trinitarian conception that excluded recognition of all other divinities and which trinitarianism continued after Akhenaton's reign in the worship of other divinities, notably Amon, Ra, and Ptah.
Rather, they are to be interpreted as polemic directed at the Egyptian gods (including Hapy, Hekhet, the Apis bull, Ptah, Amon-Re, Isis, the deified vizier Imhotep, Nut, Shu, Tefnut, Senehem, Anubis, the deified Pharaoh himself), and the concept of Maat.
The Sebayet Tradition is the African theory and practice of wise instruction whereby the wise elder, in the way of Ptah Hotep, imparts knowledge and the ways of medew nefer (good speech) to the youth because "no one is born wise.
As Keel correctly points out, it is not true that anthropomorphic figures of Egyptian deities appear first in the New Kingdom; Hapi, Heh, and Ptah are found on seal-amulets before this time.
The precepts of Ptah-Hotep represents the beginning of the arrangement of the good sayings spoken by the noble Lord, the divine father, the beloved of Ptah, and the son of the King to the first-born of Ptah-Hotep to instruct the ignorant in the knowledge of the arguments of good sayings.