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Moreover, multiple other optional domains can also exist within a module like ketoreductase or dehydratase domains which alter the default 1,3-dicarbonyl functionality of the installed ketide by sequential reduction to an alcohol and double bond, respectively. [5] [6] These domains work together like an assembly line. This type of type I PKSs ...
General chemistry (sometimes referred to as "gen chem") is offered by colleges and universities as an introductory level chemistry course usually taken by students during their first year. [1] The course is usually run with a concurrent lab section that gives students an opportunity to experience a laboratory environment and carry out ...
The 3 core sciences namely Biology, Chemistry, and Physics will be updated for first teaching in August 2023, with first examinations in May 2025. The syllabus change was originally scheduled for 2021, though the COVID-19 pandemic caused the IB to delay the syllabus change to 2023.
The unit of r(T) can be converted to mol⋅L −1 ⋅s −1, after divided by (1000×N A), where N A is the Avogadro constant. For a reaction between A and B, the collision frequency calculated with the hard-sphere model with the unit number of collisions per m 3 per second is:
Oxidative phosphorylation is a metabolic pathway that uses energy released by the oxidation of nutrients to produce adenosine triphosphate (ATP). Although the many forms of life on Earth utilize a range of different nutrients, almost all carry out oxidative phosphorylation to produce ATP, the molecule that supplies energy to metabolism.
In the so-called Ter Meer reaction (1876) named after Edmund ter Meer, [14] the reactant is a 1,1-halonitroalkane: The reaction mechanism is proposed in which in the first slow step a proton is abstracted from nitroalkane 1 to a carbanion 2 followed by protonation to an aci-nitro 3 and finally nucleophilic displacement of chlorine based on an ...
In many American medical schools, an integrated curriculum refers to a non-compartmentalized approach to basic science learning. As opposed to traditional medical curriculum, which separate subjects such as embryology, physiology, pathology and anatomy, integrated curricula alternate lectures on these subjects over the course of the first two years.
In quantum chemistry, the quantum theory of atoms in molecules (QTAIM), sometimes referred to as atoms in molecules (AIM), is a model of molecular and condensed matter electronic systems (such as crystals) in which the principal objects of molecular structure - atoms and bonds - are natural expressions of a system's observable electron density distribution function.