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Canada-0-LaboratoriesTesting ไดเรกทอรีที่ บริษัท
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ข่าว บริษัท :
- Conjugation, transformation transduction - Khan Academy
Mechanisms that generate variation in prokaryote populations Transduction, transformation, conjugation, transposable elements
- Bacterial transformation selection (article) | Khan Academy
In transformation, a plasmid is used to introduce foreign DNA into a bacterial cell The plasmid, which carries the gene of interest, is mixed with bacteria and subjected to conditions (such as heat shock or electroporation) that make the bacterial cell membrane more permeable, allowing the plasmid to enter
- Overview: DNA cloning (article) | Khan Academy
Great question! Oddly enough, no one seems to be totally sure of the answer, although heat-shock transformation is a very common technique in molecular biology In general, it's thought that the heat shock changes the fluidity of the membrane and or causes pores (holes) to form, making it easier for the DNA to get across and enter the cell 1
- The laws of thermodynamics (article) | Khan Academy
A system that doesn't exchange either energy or matter with its environment is called an "isolated" system by physicists who study thermodynamics, but a "closed " system by physicists who study classical mechanics In his video, Sal uses the classical mechanics definition, while this article uses the thermodynamics definition
- Intro to photosynthesis (article) | Khan Academy
Conversion of light energy to chemical energy Reactions of photosynthesis, where they take place, and their ecological importance
- Transcription: an overview of DNA transcription (article . . . - Khan Academy
Transcription is the first step in gene expression It involves copying a gene's DNA sequence to make an RNA molecule
- Restriction enzymes DNA ligase (article) | Khan Academy
Learn about restriction enzymes and DNA ligase in DNA cloning with Khan Academy's comprehensive tutorial
- Khan Academy
Khan Academy Khan Academy
- The water cycle (article) | Ecology | Khan Academy
The water cycle, or hydrologic cycle, is driven by the Sun’s energy The sun warms the ocean surface and other surface water, causing liquid water to evaporate and ice to sublime—turn directly from a solid to a gas These sun-driven processes move water into the atmosphere in the form of water vapor
- Competent cells, transformation, and other methods of DNA delivery
Competency and transformation DNA is a hydrophillic molecule, which means it likes to mix with water However, bacteria have cell membranes that are full of lipids - which make it very hard for DNA to pass through them and into the cell Competent cells are those whose membranes have been altered to make them more porous
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