منابع مشابه
Ribozymes
The discovery in 1982 that an intron of the protozoan Tetrahymena can excise itself from precursor ribosomal RNA in the absence of protein challenged the belief that only proteins can act as biological catalysts. The new field of RNA enzymology emerged to study such phenomena, and catalytic RNAs have now been shown to fold up to form complex three-dimensional surfaces that can bind specific sub...
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We propose Imaginary Devices, a set of freehand gestures that mimic the use of physical input devices. Imaginary Devices allow users to choose the input modality best suited for the task at hand, such as a steering wheel for a driving game or a joystick for a flight simulator. Exploiting the skills that users have acquired using physical input devices, they can instantly begin interacting with ...
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Leaders today seem to be suffering from what might be called a failure of the imagination. We seem to be continually finding ourselves in situations where the leaders say something like “no one could have imagined that this would happen.” For example: Who could imagined that Hurricane Katrina would breach the levies in New Orleans; who could have imagined that an insurgency would arise from the...
متن کاملImaginary Coloring
The axiom of choice, a benign matter for the non-logician, puzzles mathematicians. Today, it manifests itself in a strange way: it takes, depending on the axiom’s variants, either two or infinity of colors to resolve a coloring problem. Just as the parallels postulate seemed obvious, the axiom of choice has often been considered true and beyond discussion. The inventor of set theory, Georg Cant...
متن کاملSmall self-cleaving ribozymes.
The hammerhead, hairpin, hepatitis delta virus (HDV), Varkud Satellite (VS), and glmS ribozymes catalyze sequence-specific intramolecular cleavage of RNA. They range between 50 and 150 nucleotides in length, and are known as the "small self-cleaving ribozymes." Except for the glmS ribozyme that functions as a riboswitch in Gram-positive bacteria, they were originally discovered as domains of sa...
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ژورنال
عنوان ژورنال: ACS Chemical Biology
سال: 2020
ISSN: 1554-8929,1554-8937
DOI: 10.1021/acschembio.0c00214