- kethleendumarsciteerde uitvorig jaar
none of us is an island and we all live out our lives surrounded by other humans. - Poli Vasilenaciteerde uit2 jaar geleden
It’s called the lock and key modelХимическая система "замка и ключа": наши химические рецепторы воспринимают не всю молекулу вещества, а только определенный набор атомов, который остаётся одинаковым из одного вида молекул к другому
- Poli Vasilenaciteerde uit2 jaar geledenmulti-point attachment theory, developed by biologists at the University of Lyon in France. In this theory, the sweetness receptor on the tongue detects not one big structural region but up to eight, smaller and spaced-apart areas – it looks like a molecule doesn’t need to contain all eight regions to register as sweet. It’s not so much a lock and key model as a sack full of locks and a key ring crammed with tiny keys.
Некоторые сахорозаменители имеют в составе другие атомы и не подходят под наши "замки", однако мы все равно распознаем их как сладость. Возможно, у наши рецепторы воспринимают не только состав сахарозы, как сладость, но и другие более маленькие части молекул
- Poli Vasilenaciteerde uit2 jaar geledenof the bubbles inside a cake are made using the breakdown of hydrogen carbonate and are filled with carbon dioxide gas.
То есть сода в выпечке при воздействии кислоты превращается в угольную кислоту, которая потом разбивается на воду и углекислый газ. От этого газа выпечка наполняется пузырями и становится пышной и мягкой, "воздушной"
- Jerome Jordan (J - Jordan)citeerde uit2 jaar geleden
IUPAC (International Union of Pure and Applied Chemistry - burdinanataliaciteerde uit2 jaar geleden
Bridge
Your queue will always be slower
The best way to board
Beware the phantom traffic jams
ACKNOWLEDGEMENTS
INDEX - irmamirtaciteerde uit2 jaar geleden
starting with where we came from - Anaciteerde uitvorig jaar
What it means to be a species has become more nuanced as biological science has progressed. It has become apparent that the idea that each species is a distinct entity is merely a product of our own desires to categorise the organisms we find into neat boxes. Linnaeus created a system to help botanists and we have become stuck in his thought pattern ever since. All of which leads to paradoxical nonsense like ring species. You may assume that much of this only pertains to other organisms out there in the big wide world as after all, humans belong to a genus of only one species. Within the Homo genus there is only the sapiens species. But it was not always so. - Anaciteerde uitvorig jaarEvolution is blind, has no agenda and makes no choices. It is a random walk towards something that ends up being fit for purpose at the particular time and place. All of the species depicted in the ‘March of Progress’ were at some point perfectly adapted to their environment. As their environment changed, be that through change in climate, habitat or pressure from another species, that evolutionary fit to their niche may have diminished with the ultimate consequence of extinction. But none of this makes the other Homo species better or more evolved.
- Anaciteerde uitvorig jaarThe earliest known species of human is probably Homo habilis that stood at a diminutive 1.3 m (4 feet 3 inches) and lived between about two million years and one and a half million years ago. This species then evolved into Homo erectus, the progenitor of all the later members of our genus. At least, that was the straightforward story told about twenty years ago. Since then a lot of other fossils have come to light that, rather than crystallizing the picture, seem to have muddied the water. We now know that Homo erectus and Homo habilis were alive at the same time and probably in the same areas.
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