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nonnutritive    
a. 没有营养,与营养无关

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  • How large (or small) Is a photon? | Science Features
    At first glance, "How big is a photon?" might sound like a simple question After all, we think of particles as tiny bits of stuff - so surely a photon, the particle of light, has some kind of size? But when you ask a physicist, you’ll quickly discover that this question takes you into some of the strangest and most fascinating corners of quantum physics
  • How quickly does a blood cell circulate? | Science Questions
    How long does it take a drop of blood to do a full circuit of the system? Cheers, I love
  • Why is gooseberry jam red when gooseberries are green?
    Charis Lestrange put this thorny question to Dr Sarka Tumova, a food scientist at the University of Leeds Sarka - This question also really intrigued me My mother often makes jam from green gooseberries and the colour is never red but rather dark yellow or light orange It's a colour change either way
  • How does CRISPR gene editing work? | Interviews
    They divide and create more stem cells but more importantly they populate the whole body with all the blood lineages that we're familiar with So red blood cells, white blood cells and platelets Will - How long does it take for these new engineered cells to sort of have an effect?
  • What was on the other side of Earth to Pangea?
    This makes it harder for geologists to study We can say more about Pangea, where much of the supercontinent is known to have been arid You can see the red desert sandstones deposited from this time in many places in the UK today
  • The Milky Way and Andromeda might not collide after all | Interviews
    Matt - Well, I think beforehand, people just did the pretty simple thing of looking at the Milky Way and looking at Andromeda and realised that we were moving towards each other at about 200 kilometres per second and then realised, well, you know, the natural thing is that we crash at some point This new paper has done a lot more of a detailed dynamical model of all of the galaxies in the
  • The ATGCs of DNA | Science Features
    The following day I'm at it again The instructions tell me to assemble 18 phosphate molecules and 20 deoxyribose sugar molecules I make the phosphates by attaching four red oxygen atoms to a central purple phosphorus atom using grey tubes (covalent bonds) Then I make the deoxyribose sugars by building covalently bonded pentagonal rings of four carbons and one oxygen, with attachments on the
  • How natural history museums shape our view of the world
    What stories do natural history museums choose to tell, and - crucially - what’s left out? This is the thrust of a new book called Nature’s Memory, by Jack Ashby, who is Assistant Director at the University Museum of Zoology in Cambridge He reveals how these institutions shape our view of the natural world not just through science but also through politics, colonialism, and
  • James Webb Space Telescope spots mysterious early galaxy
    The James Webb Space Telescope can detect the red-shifted light emitted by those first galaxies, giving us our first glimpse of what the very young Universe looked like, and how it went on to form the fabric of space - and the bigger galaxies like our own - that surround us today
  • Blood Circulation | Experiments - The Naked Scientists
    The experiment, taken using a near infra-red camera because this makes the blood in the veins much more obvious





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