Welcome to Key Model World your new online destination for everything railway and scale modelling. Join us for the latest content from Key Publishing's modelling titles - Hornby Magazine and Airfix Model World - and discover the creative world of railway and scale modelling.

Key 3D models ready to view and download for free.

Jan 11, 2024 · Lock-and-key model is a model for enzyme-substrate interaction suggesting that the enzyme and the substrate possess specific complementary geometric shapes that fit exactly into one another. In this model, enzymes are depicted as highly specific. They must bind to specific substrates before they catalyze chemical reactions.

Aug 3, 2023 · Lock and Key Model. A German scientist, Emil Fischer postulated the lock and key model in 1894 to explain the enzyme’s mode of action. Fischer’s theory hypothesized that enzymes exhibit a high degree of specificity towards the substrate.

Nov 27, 2019 · The induced-fit model describes the mechanism of nonaction over competitive inhibitors, while the lock and key model describes the specificity of the active site of the enzyme to a particular substrate.

Apr 8, 2025 · Started in lockdown as a diversion, MICK WORRALL’s stunning ‘O’ gauge layout models this famous locomotive depot in Scotland, as GRAHAM BLOUNT reveals. And you can see it at Model World LIVE 2025 on April 26/27 at the NEC in Birmingham.

#4220009 KeyModel Ultra Ivory (1kg) MSRP: $82.20 #4240009 KeyModel Ultra Ivory (4kg) MSRP: $328.65 #4220010 KeyModel Ultra Light Grey (1kg) MSRP: $82.20

#4220006 KeyModel (1kg) MSRP: $176.80 #4200006 KeyModel (0.5kg) MSRP: $101.95 Additional shipping and handling charges may apply.

Oct 6, 2024 · The lock and key model is a fundamental concept in biochemistry and molecular biology, used to describe the specific binding between enzymes and substrates, antibodies and antigens, and other biological molecules. This model has been instrumental in understanding the mechanisms of enzymatic reactions, immune responses, and drug interactions. ...

Apr 1, 2024 · The “Lock and Key Model” is a fundamental concept in enzymology, introduced by Emil Fischer in 1899. This model provides an analogy to explain the specificity exhibited by enzymes during their interactions with substrates.