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theca

n. 囊,膜,鞘

囊,膜,鞘

WordNet (r) 3.0 (2006) (WordNet)

theca
n 1: a case or sheath especially a pollen sac or moss capsule
[synonym: {theca}, {sac}]
2: outer sheath of the pupa of certain insects

The Collaborative International Dictionary of English v.0.48 (gcide)

Theca \The"ca\, n.; pl. {Thecae}. [L., fr. Gr. ? a case to put
anything in. See {Tick} a cover.]
1. A sheath; a case; as, the theca, or cell, of an anther;
the theca, or spore case, of a fungus; the theca of the
spinal cord.
[1913 Webster]

2. (Zool.)
(a) The chitinous cup which protects the hydranths of
certain hydroids.
(b) The more or less cuplike calicle of a coral.
(c) The wall forming a calicle of a coral.
[1913 Webster]

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英文字典中文字典相关资料:

Theca - Wikipedia
In microbiology and planktology, a theca is a subcellular structural component out of which the frustules of diatoms and dinoflagellates are constructed
Theca — Your data. Clear insights.
We design and build AI solutions that turn hard-to-collate information into understanding—and understanding into action in your data When knowledge hides across platforms and PDFs, teams lose time and confidence
Custom Molded Fiber Packaging Manufacturer | THECA
Engineering-led molded fiber packaging manufacturer for European industry Custom molded fiber packaging, made on machines and molds we build ourselves THECA engineers the packaging, manufactures the tooling and runs all three IMFA production routes in a 6,000 m² plant in Denizli, Türkiye
THECA Definition Meaning - Merriam-Webster
The meaning of THECA is an enveloping sheath or case of an animal or animal part
Thailand Electronics Circuit Asia 2026
THECA (Thailand Electronics Circuit Asia) focuses on the global PCB and electronics circuit industry, covering the full value chain from materials and equipment to PCB manufacturing and advanced applications
Theca: Definition Meaning
Theca refers to one of the two pollen sacs in a typical anther, the pollen-bearing part of a flower’s stamen Each anther commonly has two thecae, and each theca usually contains two microsporangia, the chambers where pollen develops
Developmental and functional landscape of theca cells in ovarian . . .
Ovarian theca cells constitute essential components of the follicular microenvironment and play central roles in follicular development, steroidogenesis, and endocrine regulation
Theca | anatomy and physiology | Britannica
In the physiology of the female reproductive system, the term "theca" is used to describe layers within the ovarian follicle Specifically, the theca interna and theca externa are layers of stromal cells surrounding the developing egg
Theca Cell - an overview | ScienceDirect Topics
The inner-most layer that is closest to the granulosa cells is called the theca interna; the outer-most layer is called the theca externa The theca interna contains the endocrine cells that produce the steroid hormones

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