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Embryonic Stem Cells00:58

Embryonic Stem Cells

Embryonic stem (ES) cells are undifferentiated pluripotent cells, meaning they can produce any cell type in the body. This gives them tremendous potential in science and medicine since they can generate specific cell types for use in research or to replace body cells lost due to damage or disease.
Stem Cell Niche01:26

Stem Cell Niche

The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
Renewal of Intestinal Stem Cells01:23

Renewal of Intestinal Stem Cells

The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the goblet,...
Stem Cell Culture01:17

Stem Cell Culture

Stem cell research aims to find ways to use stem cells to regenerate and repair cellular damage. Over time, most adult cells undergo the wear and tear of aging and lose their ability to divide and repair themselves. Stem cells do not display a particular morphology or function. Adult stem cells, which exist as a small subset of cells in most tissues, keep dividing and can differentiate into a number of specialized cells generally formed by that tissue. These cells enable the body to renew and...
Stem Cell Therapy for Tissue Regeneration01:21

Stem Cell Therapy for Tissue Regeneration

Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
Types of Stem Cells used in Stem Cell Therapy
The two main cell types that...
Embryonic Stem Cells00:57

Embryonic Stem Cells

Embryonic stem (ES) cells were first discovered in mice in 1981 by Martin Evans. In 1998, James Thomson identified a method to isolate embryonic stem cells from humans. Human embryonic stem cells (hESCs) are obtained from 3-5 day old embryos that remain unused after an in vitro fertilization procedure.
ES cells are grown in a culture medium where they can divide indefinitely, creating ES cell lines. Under certain conditions, ES cells can differentiate, either spontaneously into a variety of...

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Updated: Jun 20, 2026

Mechanical Stimulation of Stem Cells Using Cyclic Uniaxial Strain
25:12

Mechanical Stimulation of Stem Cells Using Cyclic Uniaxial Strain

Published on: July 29, 2007

STEM博士課程の研修を再考する

Ian Banks1, Prineha Narang2

  • 1Ian Banks is director of Science Policy at the Foundation for American Innovation, San Francisco, CA, USA.

Science (New York, N.Y.)
|February 19, 2026
PubMed
まとめ
この要約は機械生成です。

科学における米国のリーダーシップは低下しており,中国がエリート出版物を支配している. STEM博士課程を含む米国の科学エコシステムの大幅な見直しは,熟練した科学労働力を育成するために不可欠です.

さらに関連する動画

Neural Stem Cell Reactivation in Cultured Drosophila Brain Explants
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Neural Stem Cell Reactivation in Cultured Drosophila Brain Explants

Published on: May 18, 2022

Improving Student Outcomes with an Adaptable Molecular Cloning Course-Based Undergraduate Research Experience
10:17

Improving Student Outcomes with an Adaptable Molecular Cloning Course-Based Undergraduate Research Experience

Published on: November 15, 2024

関連する実験動画

Last Updated: Jun 20, 2026

Mechanical Stimulation of Stem Cells Using Cyclic Uniaxial Strain
25:12

Mechanical Stimulation of Stem Cells Using Cyclic Uniaxial Strain

Published on: July 29, 2007

Neural Stem Cell Reactivation in Cultured Drosophila Brain Explants
05:54

Neural Stem Cell Reactivation in Cultured Drosophila Brain Explants

Published on: May 18, 2022

Improving Student Outcomes with an Adaptable Molecular Cloning Course-Based Undergraduate Research Experience
10:17

Improving Student Outcomes with an Adaptable Molecular Cloning Course-Based Undergraduate Research Experience

Published on: November 15, 2024

科学分野:

  • 科学・技術政策 科学・技術政策
  • グローバル・サイエンティフィック・コンテスト
  • STEM教育についてです.

背景:

  • 科学技術における米国のリーダーシップは,世界的な競争と地政学的な緊張の中で減少しています.
  • 2025年のNature Indexは,中国がエリート科学雑誌の出版をリードし (2024年には56%),米国の貢献は10%に低下した.

研究 の 目的:

  • 米国科学エコシステムの再構築の緊急の必要性を強調する.
  • 変化する世界的な科学の景観に適応することの重要性を強調する.

主な方法:

  • 科学出版物に関する2025年自然指数データの分析.
  • エリート科学雑誌への米国と中国の貢献の比較分析.

主要な成果:

  • エリートサイエンスジャーナルにおける中国の論文の割合は,2024年には56%に上昇した.
  • エリートサイエンスジャーナルにおける米国における論文の割合は,2024年には10%に低下し,前年とは大きく対照的です.

結論:

  • グローバルな科学生産の急速な変化は,米国の科学エコシステムの改造を必要としています.
  • 科学,技術,工学,数学 (STEM) 博士課程のための新しい経路の創出は,高度に熟練した米国の科学労働力を育成するために不可欠です.