Video Experimental Relacionado
Updated: Jun 5, 2026
08:40
Three-dimensional Patterning of Engineered Biofilms with a Do-it-yourself Bioprinter
Published on: May 16, 2019
Nuevas formas de hacer viejas paredes: sorpresas bacterianas
1Department of Microbiology and Immunology, University of Arkansas for Medical Sciences, Little Rock, AR 72205-7199, USA. kdyoung@uams.edu
Cell
|December 25, 2010
Resumen
Dos nuevas lipoproteínas, LpoA y LpoB, son esenciales para la síntesis de la pared celular bacteriana en Escherichia coli. Estas proteínas de la membrana externa regulan las proteínas clave de unión a la penicilina involucradas en la construcción de la pared celular.
Área de la Ciencia:
- Microbiología Microbiología.
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
Sus antecedentes:
- La síntesis de la pared celular de Escherichia coli es crucial para la supervivencia e integridad bacteriana.
- Las proteínas de unión a la penicilina (PBPs) son enzimas esenciales involucradas en la síntesis de peptidoglicanos, que forman la pared celular bacteriana.
- La regulación precisa de la actividad de PBP es vital para la división celular y la forma adecuadas.
Videos de Conceptos Relacionados
01:29Archaeal Cell Wall
Archaeal cell walls are structurally and compositionally distinct from their bacterial counterparts, lacking the characteristic peptidoglycan layer found in most bacteria. Instead, archaeal cell walls exhibit remarkable diversity, utilizing materials such as pseudomurein, polysaccharides, and proteins to construct their protective outer layers. This structural flexibility is closely tied to archaea's ecological adaptability.S-Layers: The Common Archaeal Cell WallThe S-layer is the most...
01:26Masonry Cavity Walls
Cavity walls feature a hollow space between the outer and inner wythes, connected only by corrosion-resistant metal ties. When water seeps through the outer wythe, it descends within this cavity, intercepted by flashing and eventually exiting through weep holes. To enhance moisture resistance, the inner wythe's cavity side often receives damp-proofing, doubling as an air barrier. The cavity can also house insulation to mitigate heat transfer.
Maintaining a clean cavity during construction is...
Maintaining a clean cavity during construction is...
01:22Bacterial Cell Wall
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...
01:18Composite Masonry Walls
Composite masonry walls combine multiple wythes of the same or different masonry materials to create a unified structure. These walls feature wythes that are bonded together either through mortar-filled collar joints, grouted spaces, or more commonly, with rigid metal ties and reinforcements, with the use of masonry header units being rare. Metal ties are preferred because they effectively minimize water penetration, as these walls primarily absorb moisture and then release it into the...
01:33Bacterial Transformation
In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
01:28Biodeterioration
Biodeterioration refers to the unwanted alteration of materials caused by microorganisms—especially fungi—which damage both organic substrates (paper, wood, textiles) and inorganic ones (stone, plaster, glass). Unlike abiotic decay, biodeterioration results from biological activity that produces physical disruption and chemical degradation.Physical deterioration occurs as fungal hyphae penetrate pores, cracks, and surface irregularities. Hyphal turgor pressure, thigmotropic growth along...