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関連する概念動画

Prokaryotic Cells01:51

Prokaryotic Cells

109.2K
Prokaryotes are small unicellular organisms that include the domains—Archaea and Bacteria. Bacteria include many common organisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize proteins....
109.2K
Binary Fission01:20

Binary Fission

52.3K
Fission is the division of a single entity into two or more parts, which regenerate into separate entities that resemble the original. Organisms in the Archaea and Bacteria domains reproduce using binary fission, in which a parent cell splits into two parts that can each grow to the size of the original parent cell. This asexual method of reproduction produces cells that are all genetically identical.
52.3K
Prokaryotic Cells01:28

Prokaryotic Cells

29.4K
Prokaryotes are small unicellular organisms that include the domains — Archaea and Bacteria. Bacteria include many common microorganisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize...
29.4K
Bacterial Cell Wall01:22

Bacterial Cell Wall

5.4K
The bacterial cell wall is an essential structural component that encases the plasma membrane, preserving cellular integrity, determining shape, and protecting against osmotic stress. This rigid yet flexible structure primarily comprises peptidoglycan, a polymer that forms a mesh-like matrix conferring mechanical strength and flexibility.Peptidoglycan Composition and StructurePeptidoglycan, the core of the bacterial cell wall, comprises alternating units of N-acetylglucosamine (NAG) and...
5.4K
Binary Fission01:26

Binary Fission

6.3K
Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...
6.3K
Bacterial Phylum Tenericutes01:24

Bacterial Phylum Tenericutes

680
The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
680

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関連する実験動画

Updated: May 5, 2026

Single-cell Analysis of Bacillus subtilis Biofilms Using Fluorescence Microscopy and Flow Cytometry
13:28

Single-cell Analysis of Bacillus subtilis Biofilms Using Fluorescence Microscopy and Flow Cytometry

Published on: February 15, 2012

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バシルス・サブティリス (Bacillus subtilis) の壁や分割装置のない生活

M Leaver1, P Domínguez-Cuevas, J M Coxhead

  • 1Institute for Cell and Molecular Biosciences, Newcastle University, Framlington Place, Newcastle Upon Tyne NE2 4HH, UK.

Nature
|February 13, 2009
PubMed
まとめ

科学者たちは,細胞壁 (L型) のない細菌が繁殖する新しい方法を発見しました. 単一の遺伝子変異により,バシルス・サブティリスはL型を形成し,典型的な細胞分裂ではなく,挤出によって増殖する.

科学分野:

  • 微生物学 微生物学とは
  • バクテリア細胞生物学
  • 抗生物質耐性研究の研究

背景:

  • バクテリアの細胞壁は,防御に不可欠であり,抗生物質の標的である.
  • L型は壁欠乏性の細菌であり,生成が困難であり,理解が不十分である.
  • 抗生物質耐性および病原性におけるそれらの役割は,ほとんど不明のままである.

研究 の 目的:

  • Bacillus subtilis.でL型を生成する制御可能なシステムを開発する.
  • バクテリアをL型変異に誘発する遺伝的要因を特定する.
  • L型の伝播のメカニズムを解明する.

主な方法:

  • Bacillus subtilis.で制御可能なL型生成システムの開発
  • L形態の安定性に関連する突然変異を特定するためにゲノム配列決定.
  • 顕微鏡検査と遺伝子分析により,L型の伝播機構を研究する.

主要な成果:

  • 単一点変異が特定され,バチルス・サブティリスをL型成長に誘導する.
  • L形態の伝播は,法定のFtsZ依存分裂に依存していない.
  • L形態の増殖のために新しいエクストルーション解像度メカニズムが観察されました.

さらに関連する動画

Single-cell Microfluidic Analysis of Bacillus subtilis
10:37

Single-cell Microfluidic Analysis of Bacillus subtilis

Published on: January 26, 2018

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Fluorescence Live-cell Imaging of the Complete Vegetative Cell Cycle of the Slow-growing Social Bacterium Myxococcus xanthus
11:45

Fluorescence Live-cell Imaging of the Complete Vegetative Cell Cycle of the Slow-growing Social Bacterium Myxococcus xanthus

Published on: June 20, 2018

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関連する実験動画

Last Updated: May 5, 2026

Single-cell Analysis of Bacillus subtilis Biofilms Using Fluorescence Microscopy and Flow Cytometry
13:28

Single-cell Analysis of Bacillus subtilis Biofilms Using Fluorescence Microscopy and Flow Cytometry

Published on: February 15, 2012

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Single-cell Microfluidic Analysis of Bacillus subtilis
10:37

Single-cell Microfluidic Analysis of Bacillus subtilis

Published on: January 26, 2018

11.6K
Fluorescence Live-cell Imaging of the Complete Vegetative Cell Cycle of the Slow-growing Social Bacterium Myxococcus xanthus
11:45

Fluorescence Live-cell Imaging of the Complete Vegetative Cell Cycle of the Slow-growing Social Bacterium Myxococcus xanthus

Published on: June 20, 2018

12.6K

結論:

  • バチルス・サブティリスの安定したL型生成のための遺伝的基礎が確立されました.
  • L型は,壁状の細菌とは異なるユニークな伝播方法を使用しています.
  • この発見は,原始的な細胞増殖と抗生物質耐性の潜在的なメカニズムについての洞察を提供します.