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関連する概念動画

Multipotency and Niche of Bulge Stem Cell01:06

Multipotency and Niche of Bulge Stem Cell

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A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
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Cells of the Epidermis01:24

Cells of the Epidermis

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The epidermis is made of four or five layers of epithelial cells, depending on its location in the body. From deep to superficial, these layers are the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
The cells in all these layers except the stratum basale are called keratinocytes, a type of cell that manufactures and stores the protein keratin. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from...
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Papillary Dermis01:11

Papillary Dermis

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Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen...
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Hypodermis01:02

Hypodermis

7.7K
The hypodermis (the subcutaneous layer or superficial fascia) is present directly below the dermis. It connects the skin to the underlying fascia (fibrous tissue) of the bones and muscles. It is not strictly a part of the skin, although the border between the hypodermis and dermis can be difficult to distinguish. The hypodermis consists of well-vascularized, loose, areolar connective tissue and adipose tissue, which functions as a mode of fat storage and provides insulation and cushioning for...
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The Hyoid Bone01:12

The Hyoid Bone

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The hyoid bone is a small U-shaped bone located in the upper neck at the level of the inferior mandible, with its tips pointing posteriorly. It does not directly articulate with any other bone in the body. The hyoid acts as the attachment site for the tongue, the larynx, and the pharynx. It is held in position by a series of small muscles attached from above or below. These muscles help to move the hyoid up/down or forward/back in coordination with movements of the tongue, larynx, and pharynx...
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Hyperbolas01:30

Hyperbolas

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A hyperbola is a conic section produced when a double-napped cone is intersected by a plane at an angle steeper than the slope of the cone, such that it cuts through both nappes. This intersection yields two separate, mirror-image curves known as branches, which open away from each other along the transverse axis. The nearest points on each branch to the hyperbola’s center are termed vertices, and the distance from the center to a vertex is denoted by a. Perpendicular to the transverse...
675

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Updated: May 5, 2026

Generation of Myospheres From hESCs by Epigenetic Reprogramming
09:32

Generation of Myospheres From hESCs by Epigenetic Reprogramming

Published on: June 21, 2014

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ヒペリオンのスポンジのような外観.

P C Thomas1, J W Armstrong, S W Asmar

  • 1Center for Radiophysics and Space Research, Cornell University, Ithaca, New York 14853, USA. pct2@cornell.edu

Nature
|July 6, 2007
PubMed
まとめ
この要約は機械生成です。

土星 サターン

さらに関連する動画

Scanning Electron Microscopy SEM Protocols for Problematic Plant, Oomycete, and Fungal Samples
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Scanning Electron Microscopy SEM Protocols for Problematic Plant, Oomycete, and Fungal Samples

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Cultivating a Three-dimensional Reconstructed Human Epidermis at a Large Scale
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Cultivating a Three-dimensional Reconstructed Human Epidermis at a Large Scale

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関連する実験動画

Last Updated: May 5, 2026

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Scanning Electron Microscopy SEM Protocols for Problematic Plant, Oomycete, and Fungal Samples
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科学分野:

  • 惑星科学 惑星科学
  • 天文学 天文学
  • 天体物理学 天体物理学

背景:

  • ハイペリオン (Hyperion) は,土星の最大の不規則な月で,混沌とした回転を示しています.
  • その表面は小さな氷の月の中でユニークですが,その理由は不明です.

研究 の 目的:

  • 土星の衛星ヒペリオン (Hyperion) のユニークな表面の特徴と物理的性質を調査する.
  • ヒペリオンの独特な表面の姿とクレーター保存の原因を特定するために.

主な方法:

  • ハイペリオン表面の高解像度の画像の分析.
  • 表面クレーターのマッピング.
  • ヒペリオンの大きさ,質量,平均密度の決定.

主要な成果:

  • Hyperionは,キロメートルのスケールで特徴的なスポンジのような質感を示しています.
  • よく保存されたクレーター (2-10 km) の高密度が観察されました.
  • 平均密度は 544 +/- 50 kg m(-3 で計算され,ポロ性が 40% を超えることを示しています.

結論:

  • ハイペリオンの高孔性 (>40%) は,そのユニークな表面の重要な要因です.
  • 毛細さは,噴出物を減らすことで,クレーターの保存を高める可能性が高い.
  • これは,ヒペリオンの異常な外観とクレーターに囲まれた景色を説明します.