Holdfast

A holdfast is a root-like structure that anchors aquatic sessile organisms, such as seaweed, other sessile algae, stalked crinoids, benthic cnidarians, and sponges, to the substrate.

Holdfasts vary in shape and form depending on both the species and the substrate type. The holdfasts of organisms that live in muddy substrates often have complex tangles of root-like growths. Those of organisms that live in sandy substrates are bulb-like and very flexible, such as the holdfast of sea pens, thus permitting the organism to pull the entire body into the substrate when the holdfast is contracted. The holdfasts of organisms that live on smooth surfaces (such as the surface of a boulder) have the flattened base of the holdfast literally glued to the surface. The organism derives no nutrition from this intimate contact with the substrate, as the process of liberating nutrients from the substrate requires enzymatically eroding the substrate away, thereby increasing the risk of organism falling off of the substrate.

单词	hapteron
释义	hapteron /'hæptərɔn/ 英汉-汉英词典 n. 附著器词组 \| 习惯用语您要查找的是不是： chapter n. 章，回；人生或历史上的重要时期；（俱乐部、协会等的）分会 vt. 把…分成章节 chaperon vt. 陪伴；护送 n. 年长女伴（陪伴未婚少女上社交场所的）；监护人（青年社交聚会时在场的） paternal adj. 父亲的；得自父亲的；父亲般的 Chatterton 查特顿网络短语: hapteron 菌索茎; 附着器菌所; haptera hapteron 附着器英语例句库 Holdfast(hapteron) In algae, the cell or organ that attaches the plant to the substrate. 固着器：是藻类植物具有的一种起固着作用的细胞或器官。声明：以上例句、词性分类均由互联网资源自动生成，未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。英语百科 Holdfast A holdfast is a root-like structure that anchors aquatic sessile organisms, such as seaweed, other sessile algae, stalked crinoids, benthic cnidarians, and sponges, to the substrate. Holdfasts vary in shape and form depending on both the species and the substrate type. The holdfasts of organisms that live in muddy substrates often have complex tangles of root-like growths. Those of organisms that live in sandy substrates are bulb-like and very flexible, such as the holdfast of sea pens, thus permitting the organism to pull the entire body into the substrate when the holdfast is contracted. The holdfasts of organisms that live on smooth surfaces (such as the surface of a boulder) have the flattened base of the holdfast literally glued to the surface. The organism derives no nutrition from this intimate contact with the substrate, as the process of liberating nutrients from the substrate requires enzymatically eroding the substrate away, thereby increasing the risk of organism falling off of the substrate.
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hapteron /'hæptərɔn/

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网络短语:

Holdfast