منابع مشابه
CO2 in Planted Aquaria
CO2 is beyond comparison the most important of all plant nutrients. Without sufficient CO2, plants cannot photosynthesize and convert into energy-rich sugars, starch and all the other carbon-containing molecules that constitute a plant. It may seem odd to look at CO2 as a plant nutrient. When growing terrestrial plants, we are used to providing light, water and nutrients, but never CO2. is art...
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A Gallionella sp. is described that lives and freely multiplies in sea water. The habitat of the organism has been thoroughly investigated and the possibility of accidental occurrence has been eliminated. The appearance of the Gallionella sp. described is quite different from the similar iron bacteria occurring in fresh water.
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In this paper I aim to show that a certain law of nature, namely that common salt (sodium chloride) dissolves in water, is metaphysically necessary. The importance of this result is that it conflicts with a widely shared intuition that the laws of nature (most if not all) are contingent. There have been debates over whether some laws, such as Newton’s second law, might be definitional of their ...
متن کاملWater and Salt Excretion
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ژورنال
عنوان ژورنال: Scientific American
سال: 1918
ISSN: 0036-8733
DOI: 10.1038/scientificamerican06221918-394asupp