Normally, when water freezes into ice, its molecules line up to form a stable, orderly structure. Salt interrupts the process, however, and temperatures must drop lower to overcome that interruption and for freezing ...
Otter fur is spiky, so it traps insulating air molecules.海獭毛尖锐，能够困住保温空气分子。And that is exactly what snowflakes do.和雪花是一样的。Powdery, fresh snow can be up to 95% trapped air.新鲜的粉末状雪花有时能锁住95%的空气。This makes it an excellent insulator, but the same way ...
Or it might fight cancer by triggering the bodys' immune response to make molecules that signal cancer cells to die.或者，它可能通过触发身体的免疫反应，使分子发出信号使癌细胞死亡，以此来对抗癌症。But if that sounds really good to you, maybe don't go downing like ten straight pineapples just...
Molecules are constantly vibrating, and these vibrations change when the molecules absorb IR light. The changes in vibration include the bending and stretching of various bonds. Each type of bond within a molecule absorbs IR at different wavelengths. So, to identify ethanol in a sample, you have...
and it's coordinated by these molecules that are called pro-inflammatory cytokines. You can think of cytokines as sort of the chemical messengers of the immune system. So they're out there right now, swimming through your bloodstr...
The paint or dye molecules absorb specific frequencies and bounce back, or reflect, other frequencies to your eye. The reflected frequency (or frequencies) are what you see as the color of the object. For example, the leaves of green plants contain a pigment called chlorophyll, which absorbs ...
Molecules are constantly vibrating, and these vibrations change when the molecules absorb IR light. The changes in vibration include the bending and stretching of various bonds. Each type of bond within a molecule absorbs IR at different wavelengths. So, to identify ethanol in a sample, you have...
techniques like X-ray crystallography discover are static structures.Action in biologycomes,by contrast, from how molecules interact with each other. “It is”, he puts it, “a bit like someone asking how a car works, so you open the hood [bonnet] and take a picture and say, ‘There, ...
Water molecules are naturally attracted and stick to each other because of this polarity, forming a hydrogen bond. This hydrogen bond is the reason behind many of water's special properties, such as the fact that it's denser in its liquid state than in its solid state (ice floats on ...