Tag: Theque
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Ootheca
Buckle up, bug lovers, because we’re about to embark on a wild ride through the wacky world of oothecae! šš„š¢ Picture this: You’re a lady mantis, feeling frisky after a hot date (and maybe a little post-coital cannibalism, because why not?). But instead of popping out eggs willy-nilly like some common housefly, you’ve got a…
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Ascus (Mythology)
Ascus (Ancient Greek: į¼ĻĪŗĪæĻ) was a giant from ancient Greek mythology, who in conjunction with Lycurgus of Thrace chained the god Dionysus and threw him into a river. The god Hermes (or, according to other tellings, Zeus) rescued Dionysus, conquered (į¼Ī“Ī±Ī¼Ī±ĻĪµĪ½) the giant, flayed him, and made a bag (į¼ĻĪŗĪæĻ) of his skin.[1][2] A folk etymology once said that the town of Damascus in Syria derived its name from this event,…
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Thecal Sac or Dural Sac
TheĀ thecal sacĀ orĀ dural sacĀ is theĀ membranousĀ sheathĀ (theca) or tube ofĀ dura materĀ that surrounds theĀ spinal cordĀ and theĀ cauda equina. The thecal sac contains theĀ cerebrospinal fluidĀ which provides nutrients and buoyancy to the spinal cord.[1]Ā From theĀ skullĀ the tube adheres to bone at theĀ foramen magnumĀ and extends down to the secondĀ sacral vertebraĀ where it tapers to cover over theĀ filum terminale. Along most of theĀ spinal canalĀ it is separated…
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Theca folliculi
The theca folliculi comprise a layer of the ovarian follicles. They appear as the follicles become secondary follicles. The theca are divided into two layers, the theca interna and the theca externa.[1] Theca cells are a group of endocrine cells in the ovary made up of connective tissue surrounding the follicle. They have many diverse functions, including promoting folliculogenesis and recruitment of a single…
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Theca
In biology, a theca (pl.: thecae) is a sheath or a covering. Botany The typical anther is bilocular, i.e. it consists of two thecae. Each theca contains two microsporangia, also known as pollen sacs. The microsporangia produce the microspores, which for seed plants are known as pollen grains. If the pollen sacs are not adjacent, or if they open separately, then no thecae are…
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Xylotheque
AĀ xylothequeĀ orĀ xylothekĀ (from the GreekĀ xylonĀ for “wood” andĀ thequeĀ meaning “repository”) is special form ofĀ herbariumĀ that consists of a collection of authenticated wood specimens.[1]Ā It is also known as aĀ xylariumĀ (from the GreekĀ xylonĀ for “wood” and LatinĀ ariumĀ meaning “separate place”). Traditionally, xylotheque specimens were in the form of book-shaped volumes, each made of a particular kind of wood and holding samples of the different parts…
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Steroidogenic factor 1Ā (SF-1)Ā protein and a few related things
The steroidogenic factor 1 (SF-1) protein is a transcription factor involved in sex determination by controlling the activity of genes related to the reproductive glands or gonads and adrenal glands. This protein is encoded by the NR5A1 gene, a member of the nuclear receptor subfamily, located on the long arm of chromosome 9 at position 33.3. It was originally identified as a regulator of genes encoding cytochrome P450 steroid hydroxylases, however, further roles…
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It Ain’t Easy Being Green
Is this why they have gone off the rails with the beta carotene and related things? Thoughts for another day. A search for “green plasma” at pubmed turns up 130 articles from 1965 to present. A search for green plasma (without the marks) or ‘green plasma’ at the same place turns up 1280 articles from…
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Polish Cochineal (Porphyrophora polonica)
Polish cochineal (Porphyrophora polonica), also known as Polish carmine scales, is a scale insect formerly used to produce a crimson dye of the same name, colloquially known as “Saint John’s blood”. The larvae of P. polonica are sessile parasites living on the roots of various herbsāespecially those of the perennial knawelāgrowing on the sandy soils of Central Europe and other parts of Eurasia. Before the development of aniline, alizarin, and other synthetic dyes, the insect was…
