Carbon Chain Elongation
Carbon Chain Elongation - Related Videos
02:35
Transcription Elongation Factors
0 Views •
2020
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene. The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
02:35
Transcription Elongation Factors
0 Views •
2023
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene. The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
10:46
Novel Metrics to Characterize Embryonic Elongation of the Nematode Caenorhabditis elegans
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Cited by 3 •
2016
Here we detail protocols specifically designed to monitor morphogenic defects that occur during early and late phases of embryonic elongation of the nematode Caenorhabditis elegans. Ultimately, these protocols are designed to identify genes that regulate these phases and to characterize their differential requirements along the antero-posterior axis of the embryo.
13:27
PCR: The Polymerase Chain Reaction
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2023
The polymerase chain reaction, or PCR, is a technique used to amplify DNA through thermocycling – cyles of temperature changes at fixed time intervals. Using a thermostable DNA polymerase, PCR can create numerous copies of DNA from DNA building blocks called dNTPs. There are three steps in PCR: denaturation, annealing, and elongation. Denaturation is the first step in the cycle and causes the DNA to melt by disrupting hydrogen bonds between the bases resulting in single-stranded DNA. Annealing...
01:28
Electron Transport Chains
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2019
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle. The ETC is comprised of...
FAQs
The key bond-forming event pairs a carbon nucleophile with an electrophile, allowing the organic framework to gain a new carbon-carbon connection. In one route, an organometallic reagent participates in alkylation; in another, it adds to a carbonyl group. Choosing between these pathways changes how the new bond forms and what functional groups remain available for later transformations.
Alkylation and carbonyl addition provide different bond-forming contexts. In alkylation, the carbon nucleophile forms a carbon-carbon bond with an electrophilic partner. Carbonyl addition instead places the nucleophile at a carbonyl-containing site, creating a different structural outcome. This distinction helps chemists select a route that matches the desired carbon skeleton and the functional groups needed for subsequent refinement.
Regioselectivity and stereochemistry determine where the new carbon-carbon bond appears and how atoms are arranged in three-dimensional space. Reaction conditions influence these outcomes, so they are part of structural control rather than merely operational details. Managing these variables can distinguish products with different structures and, consequently, different properties.
A useful planning workflow begins by identifying the carbon framework that must be enlarged and selecting a compatible carbon nucleophile and electrophile. The chemist then chooses an alkylation or carbonyl-addition strategy, establishes conditions that support the intended regioselectivity and stereochemistry, and applies functional-group transformations to refine the product. This sequence connects reaction design with the structure sought.
Carbon chain elongation is especially useful when a project requires related compounds that differ in backbone length or when a larger scaffold must be assembled from a smaller one. That makes it relevant to homologous series and to the preparation of natural-product building blocks, pharmaceuticals, polymers, and other materials, where the carbon framework affects properties.
They allow the newly enlarged framework to be adjusted rather than treated as a final structure. After carbon-carbon bond formation, such transformations can extend or refine the molecule’s functional pattern, helping align the product with the intended compound class. This flexibility is important when constructing natural-product building blocks, pharmaceutical structures, polymers, or other materials.