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Diversity of Protists III01:27

Diversity of Protists III

Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
The Fossil Record02:56

The Fossil Record

The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
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...
Tooth Anatomy01:21

Tooth Anatomy

The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.
Convergent Evolution01:54

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
Compact Bone01:27

Compact Bone

Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...

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関連する実験動画

Updated: Jul 12, 2026

Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm
15:39

Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm

Published on: February 28, 2017

コノドントの真珠?

B F Glenister, G Klapper, K M Chauff

    Science (New York, N.Y.)
    |August 13, 1976
    PubMed
    まとめ

    コンドントの化石で発見された穴のある球体は,コンドント動物が分泌した真珠である可能性が高い. これらの微生物化石は,これらの古代の海洋生物の生物学に関する新しい洞察を提供します.

    科学分野:

    • パレオントロジー・パレオントロジー
    • 微生物学 微生物学とは
    • 地質化学 地質化学

    背景:

    • コノドントは,海洋岩石 (カンブリア紀・トライア紀) の謎めいた,歯のような微生物化石です.
    • 偶発的な穴のある球体 (<1mm) はコノドントで発見されています.
    • これらの球体は,コンドントと化学的組成と微細構造が同一である.

    研究 の 目的:

    • コンドントの微生物化石の横で見つかった穴のある球の性質を調査するために.
    • これらの謎の球体の生物学的起源を決定するために.

    主な方法:

    • 鉱物学,形態学,そして穴のついた球体の発生の分析.
    • 球の特性を,既知の生体材料と比較する.

    主要な成果:

    • 穴のある球体は,コノドントの化学組成と微細構造とまったく同じです.
    • 物理的特徴 (鉱物学,形質学,発生) は真珠の形成と一致しています.

    結論:

    • 穴のある球体は,コノドントを持つ動物によって分泌される真珠として解釈されています.

    さらに関連する動画

    Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
    08:02

    Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

    Published on: May 7, 2016

    Characterization Of Multi-layered Fish Scales (Atractosteus spatula) Using Nanoindentation, X-ray CT, FTIR, and SEM
    10:06

    Characterization Of Multi-layered Fish Scales (Atractosteus spatula) Using Nanoindentation, X-ray CT, FTIR, and SEM

    Published on: July 10, 2014

    関連する実験動画

    Last Updated: Jul 12, 2026

    Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm
    15:39

    Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm

    Published on: February 28, 2017

    Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
    08:02

    Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

    Published on: May 7, 2016

    Characterization Of Multi-layered Fish Scales (Atractosteus spatula) Using Nanoindentation, X-ray CT, FTIR, and SEM
    10:06

    Characterization Of Multi-layered Fish Scales (Atractosteus spatula) Using Nanoindentation, X-ray CT, FTIR, and SEM

    Published on: July 10, 2014

  • この発見は,コンドントの生物学と行動に関する潜在的洞察を提供します.