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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: We build AI solutions that find and explain your important . . .
Theca helps you find what matters, understand it faster, and enable you to make better decisions
THECA Definition Meaning - Merriam-Webster
The meaning of THECA is an enveloping sheath or case of an animal or animal part
Where are the theca cells from: the mechanism of theca cells derivation . . .
Focusing on the question of where theca cells originate, this article discusses the origin of theca cells and the factors involved in their recruitment and differentiation, which will help us comprehensively understand the mystery of theca cells’ life cycle
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
Relics - Theca - Vatican
She was a reformer who authored hundreds of letters and The Dialogue of Divine Providence while serving the sick and poor, leaving a profound impact on church theology The sanctuary lamp may also be seen in Eastern Orthodox Churches
About us - Theca
At the core of Theca we believe that the way we navigate the Internet today is not how Internet was meant to be navigated when it first took shape We believe that freedom, democracy and the right to be seen have been offset over the years We are building solutions to address these issues
Thailand Electronics Circuit Asia 2026
Highlight the attractive investment opportunities in Thailand’s PCB and PCBA manufacturing sector, showcasing the country’s infrastructure Encourage local PCB manufacturers to source materials and components from domestic suppliers, fostering a resilient local supply chain
Theca - BYJUS
The cavity of the anther lobe is called theca The lobes having two thecae are termed dithecous Each theca has two pollen sacs or microsporangia These microsporangia produce microspores that aid in the development of pollen grains Moreover, an anther need not be dithecous and bilobed every time

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