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相关概念视频

Seedless Vascular Plants03:24

Seedless Vascular Plants

Seedless Vascular Plants Were the First Tall Plants on Earth
Seed Structure and Early Development of the Sporophyte02:33

Seed Structure and Early Development of the Sporophyte

Seed structures are composed of a protective seed coat surrounding a plant embryo, and a food store for the developing embryo. The embryo contains the precursor tissues for leaves, stem, and roots. The endosperm and cotyledons—seed leaves—act as the food reserves for the growing embryo.
The Angiosperm Life Cycle02:39

The Angiosperm Life Cycle

Plants have a life cycle split between two multicellular stages: a haploid stage—with cells containing one set of chromosomes—and a diploid stage—with cells containing two sets of chromosomes. The haploid stage is the gamete-producing gametophyte, and the diploid stage is the spore-producing sporophyte.
Introduction to Plant Diversity02:22

Introduction to Plant Diversity

From Water to Land
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
Spermatogenesis01:41

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...

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相关实验视频

Updated: Jul 11, 2026

Dissection and Live-Imaging of the Late Embryonic Drosophila Gonad
09:08

Dissection and Live-Imaging of the Late Embryonic Drosophila Gonad

Published on: October 17, 2020

德纪的体球体与解剖学上保存的体球体.

W Remy, R Remy

    Science (New York, N.Y.)
    |April 18, 1980
    PubMed
    概括
    此摘要是机器生成的。

    最古老的化石类植物,可以追溯到底纪,揭示了早期的陆地植物繁殖. 这些保存完好的标本显示了男性和女性生殖器官的独特结构.

    更多相关视频

    Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes
    10:30

    Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes

    Published on: January 20, 2014

    Preparation of Drosophila Larval and Pupal Testes for Analysis of Cell Division in Live, Intact Tissue
    08:05

    Preparation of Drosophila Larval and Pupal Testes for Analysis of Cell Division in Live, Intact Tissue

    Published on: May 19, 2020

    相关实验视频

    Last Updated: Jul 11, 2026

    Dissection and Live-Imaging of the Late Embryonic Drosophila Gonad
    09:08

    Dissection and Live-Imaging of the Late Embryonic Drosophila Gonad

    Published on: October 17, 2020

    Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes
    10:30

    Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes

    Published on: January 20, 2014

    Preparation of Drosophila Larval and Pupal Testes for Analysis of Cell Division in Live, Intact Tissue
    08:05

    Preparation of Drosophila Larval and Pupal Testes for Analysis of Cell Division in Live, Intact Tissue

    Published on: May 19, 2020

    科学领域:

    • 古植物学是古植物学.
    • 陆地植物的进化 陆地植物的进化
    • 生殖生物学 生殖生物学

    背景情况:

    • 了解早期陆地植物的进化对于重建陆地生态系统至关重要.
    • 早期陆地植物生殖结构的化石证据很少,这限制了我们对它们生命周期的了解.

    研究的目的:

    • 描述和分析已知最古老的解剖学上保存和生理学上独立的细胞体.
    • 提供关于早期陆地植物在底纪时期的繁殖策略的见解.

    主要方法:

    • 对来自苏格兰的化石标本进行了详细的形态分析.
    • 游戏植物结构的比较解剖学研究,包括游戏-tangiophores,antheridia和archegonia.

    主要成果:

    • 描述低代纪的游戏植物,直立的,没有叶子的轴.
    • 标识终端产生的,碗形的游戏-tangiophores.
    • 观测有多细胞壁的茎状虫和在共同的基础上聚集的虫.

    结论:

    • 这些发现代表了解剖学上保存的最古老的证据和独立的游戏细胞.
    • 描述的结构为早期陆地植物的生殖形态和演变提供了重要的见解.