In the mid-1800s, the agricultural chemist Justus von Liebig demonstrated strong positive relationships between soil nutrient supplies and the growth yields of terrestrial plants, and it has since been found that freshwater and marine plants are equally responsive to nutrient inputs. Anthropogenic inputs of nutrients to the Earth's surface and atmosphere have increased greatly during the past t...

position of such nutrient arteries is reasonably predictable. On the nerve a series of epineural vessels is formed, whose branches pass into the perineurium and, finally, there is produced within the fasciculi a longitudinally disposed capillary plexus which is continuous throughout the length of the nerve and is not dominated by local nutrient vessels. Experimental. The intraneural plexus form...

Nutrients (protein, carbohydrates and fats) have traditionally been thought of as fuels simply providing the energy for cellular metabolic activity. According to the classic view, if nutrients are available, then anabolic pathways are activated, and if nutrients are not available, catabolic pathways are activated. However, it is becoming increasingly clear that nutrient effects on bone cells (s...