Written by Khalil A. Cassimally

The DNA (deoxyribonucleic acid) is a unique molecule. It contains every single piece of genetic information of a person; just likerepparttar memory card of a PC, which contains allrepparttar 105815 data. The major difference betweenrepparttar 105816 DNA andrepparttar 105817 memory card of your PC though is thatrepparttar 105818 microscopic DNA helix can store more data – actually about a thousand times more. So, scientists have gotrepparttar 105819 bright idea of mimickingrepparttar 105820 DNA’s data-storage secrets for use on your PC’s memory card. This will lead to a more compact data processing and storage circuitry.

Inrepparttar 105821 standard silicon-based chip (which isrepparttar 105822 basic unit of practically any electrical instruments) information processing is limited byrepparttar 105823 distance betweenrepparttar 105824 units which store and process data. With DNA scaffolding however,repparttar 105825 interconnections can be made really short so as to increaserepparttar 105826 performance. And that’s whatrepparttar 105827 scientists have been working on.

The DNA scaffolding is made up of artificial DNA ‘tiles’ that automatically join together in a predetermined pattern. The so-formed molecular fabric has many strands. These DNA strands will clip to nanocomponents coated withrepparttar 105828 matching DNA strands. The nanocomponents could be metallic particles that can store or process data in form of an electric and magnetic state or they could simply be organic molecules.

Programmed life

Written by Khalil A. Cassimally

Does aging happen by chance? Is agingrepparttar breaking down of an organism tillrepparttar 105814 latter eventually stops working?

According to Valter Longo’s latest research, which was published inrepparttar 105815 September 27 edition ofrepparttar 105816 Journal of Cell Biology, aging is a programmed process. For Longo’s part, aging is supposed to ensurerepparttar 105817 premature death ofrepparttar 105818 majority of a population.

The dead will then consequently provide nutrients forrepparttar 105819 sake of a few individuals who have acquired genetic mutations. (Think of yeast rather than big complex mammals.) These mutants are more adapted to their environment thanrepparttar 105820 other ‘normal’ organisms. Therefore these ‘sacrificial’ deaths increaserepparttar 105821 chances of reproduction ofrepparttar 105822 mutants asrepparttar 105823 latter will have more nutrients to feed on.

Now Charles Darwin may not be very happy with Longo’s theory. Darwin’s natural selection happens at individual level. The better suited to its environment an organism is,repparttar 105824 more probable that it will reproduce. This ensures thatrepparttar 105825 species changes or evolves over time as such type of reproduction brings genetic changes torepparttar 105826 offsprings. This makesrepparttar 105827 offsprings more adapted to their ever-changing environment.

Longo’s theory however rests onrepparttar 105828 group selection theory. Many scientists think that this theory is incorrect. The latter proposes that selection happens not at individual level but at group level instead.

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