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相关概念视频

Parental Care00:55

Parental Care

Many animals exhibit parental care behavior, including feeding, grooming, and protecting young offspring. Parental care is universal in mammals and birds, which often have young that are born relatively helpless. Several species of insects and fish, as well as some amphibians, also care for their young.
The Mammary Glands01:12

The Mammary Glands

The female breast is a hemispheric projection of variable size positioned anterior to the pectoralis major and serratus anterior muscles. A fascia layer composed of dense, irregular connective tissue connects it to these muscles.
Each breast features a pigmented projection known as the nipple, through which milk emerges via closely spaced openings of ducts, referred to as lactiferous ducts. Surrounding the nipple is a circular pigmented area of skin named the areola, which appears rough due to...

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相关实验视频

Updated: Jun 25, 2026

Cereal Crop Ear Counting in Field Conditions Using Zenithal RGB Images
11:49

Cereal Crop Ear Counting in Field Conditions Using Zenithal RGB Images

Published on: February 2, 2019

描述一个哺乳动物周年节拍器的特征.

Gerald A Lincoln1, Iain J Clarke, Roelof A Hut

  • 1Centre for Reproductive Biology, University of Edinburgh, Queen's Medical Research Institute, Edinburgh, Scotland. g.lincoln@hrsu.mrc.ac.uk

Science (New York, N.Y.)
|December 23, 2006
PubMed
概括

季节性生物节奏是由垂体腺控制的. 这项研究揭示了脑下垂体内的"节拍器-奴隶"系统,涉及调节黑激素的细胞和分泌益生素的细胞,以产生这些关键的年度定时机制.

科学领域:

  • 内分泌学 在内分泌学.
  • 时间生物学 时间生物学
  • 动物生理学 动物生理学

背景情况:

  • 许多物种表现出内生年周期,以适应季节性变化.
  • 这些环年节律的潜在解剖学和细胞机制在很大程度上仍未被定义.

研究的目的:

  • 调查周年节律调节的解剖学和细胞基础.
  • 在体内确定控制季节性益生素分泌的时间机制.

主要方法:

  • 使用了一种体内生殖的豆羊模型.
  • 研究了垂体腺在调节环年节律中的作用.

主要成果:

  • 提供了强有力的证据,证明基于垂体的计时机制可以控制环年节律.
  • 鉴定了一种内"起器-奴隶"计时系统,涉及黑激素调节细胞和分泌前素的细胞.

结论:

  • pituitary 腺体是周周节律的关键时间机制.
  • 由黑色素调节的定时细胞与分泌前素的细胞相互作用,形成一个内起器-奴隶系统.
  • 这些发现为对长期生物定时的分子研究铺平了道路.

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