Nitrogen Related Quotes

You don't usually think of boredom as something similar to pain. That's because you've only been exposed to it in relatively small doses. You don’t know its true colour. The difference between the boredom you know and the boredom I know is like the difference between touching snow and putting your hand in a vat of liquid nitrogen.

In the Amazon, the turn to swidden was unfortunate. Slash-and-burn cultivation has become one of the driving forces behind the loss of tropical forest. Although swidden does permit the forest to regrow, it is wildly inefficient and environmentally unsound. The burning sends up in smoke most of the nutrients in the vegetation—almost all of the nitrogen and half the phosphorus and potassium. At the same time, it pours huge amounts of carbon dioxide into the air, a factor in global warming. (Large cattle ranches are the major offenders in the Amazon, but small-scale farmers are responsible for up to a third of the clearing.) Fortunately, it is a relatively new practice, which means it has not yet had much time to cause damage. More important, the very existence of so much healthy forest after twelve thousand years of use by large populations suggests that whatever Indians did before swidden must have been ecologically more sustainable.

If we ascribe the ejection of the proton to a Compton recoil from a quantum of 52 x 106 electron volts, then the nitrogen recoil atom arising by a similar process should have an energy not greater than about 400,000 volts, should produce not more than about 10,000 ions, and have a range in the air at N.T.P. of about 1-3mm. Actually, some of the recoil atoms in nitrogen produce at least 30,000 ions. In collaboration with Dr. Feather, I have observed the recoil atoms in an expansion chamber, and their range, estimated visually, was sometimes as much as 3mm. at N.T.P. These results, and others I have obtained in the course of the work, are very difficult to explain on the assumption that the radiation from beryllium is a quantum radiation, if energy and momentum are to be conserved in the collisions. The difficulties disappear, however, if it be assumed that the radiation consists of particles of mass 1 and charge 0, or neutrons. The capture of the a-particle by the Be9 nucleus may be supposed to result in the formation of a C12 nucleus and the emission of the neutron. From the energy relations of this process the velocity of the neutron emitted in the forward direction may well be about 3 x 109 cm. per sec. The collisions of this neutron with the atoms through which it passes give rise to the recoil atoms, and the observed energies of the recoil atoms are in fair agreement with this view. Moreover, I have observed that the protons ejected from hydrogen by the radiation emitted in the opposite direction to that of the exciting a-particle appear to have a much smaller range than those ejected by the forward radiation. This again receives a simple explanation on the neutron hypothesis.

Predators preserve an echo of the isotopic ratios of their prey, so they can be included in the calculation, too. Carbon-isotope studies have shown, for example, that some very early human relatives were quite likely eating more meat than had been suspected. Similarly, the further up the food chain you are, the greater the ratio in your bones and teeth will be between the stable nitrogen isotopes 15N and 14N. On this basis, it has been suggested that our close relatives the Neanderthals were highly carnivorous: that, indeed, they may have specialized, at least regionally, in hunting extremely large-bodied prey, such as woolly mammoths and woolly rhinos.

The Haney Soil Test measures seven parameters related to soil biology: Water-extractable organic carbon (WEOC) Water-extractable organic nitrogen (WEON) Percent microbially active carbon (MAC) Inorganic nitrogen and phosphorus levels Organic nitrogen and phosphorus levels Organic C:N ratio One-day CO2 respiration All seven parameters are used to arrive at a final soil-health score.

At this scale what you actually sense is a space of possibilities, of ethereal electrostatic pushes and pulls. The closest comparison we can make to this experience is a blindfolded tasting of unknown foods and flavors. There is a menu of such sensations here, unique flourishes lined up end to end. Here's an entity we call a carbon atom. Here are ones called oxygen, nitrogen, hydrogen. They're clumped together as other recognizable things, relatively simple molecules called nucleotides: adenine, thymine, guanine, cytosine, arrayed along a pair of sugar-phosphate rails that curve off into the distance in either direction. But what any of these look like is no longer entirely meaningful. What is meaningful is the "state" of these entities, their electromagnetic energies, their vibrations and rotations, their still-intangible patterns of presence. Walking among them you are buffeted by a multitude of calls and entreaties in the form of attractions and repulsions, yet this seemingly disordered cacophony is shot through with regularity and information.

Lichens are widespread in many deserts. They have no root system, absorbing water vapour from the atmosphere, and are therefore particularly extensive in the world’s coastal foggy deserts. Lichens are a unique group of life forms that consist of two closely related parts, a fungus and a partner that can produce food from sunlight. This partner is usually either an alga, or occasionally a blue-green bacterium known as ‘cyanobacteria’. Algal cells are protected by surrounding fungus which takes nutrition from the algae. When cyanobacteria are involved, nitrogen fixation is an additional benefit.

How? Next time you’re in a forest, dig into the duff, and you’re bound to find white, cobwebby threads attached to roots. These are the underground parts of special fungi that deliver phosphorus to trees in return for carbon. Textbooks once described the exchange as exclusive, one tree to one fungus, until the data begged to differ. Simard’s work was among the first to prove that fungi branch out from the roots of one tree to connect dozens of trees and shrubs and herbs—not only relatives but entirely different species. [This “wood-wide web” is an underground Internet through which water, carbon, nitrogen, phosphorus, and even defense compounds are exchanged.] When a pest troubles one tree, its alarm chemicals travel via fungi to the other members of the network, giving them time to beef up their defenses. Thanks to researchers like Simard, foresters are now encouraged to leave birch and large hub trees in the forest to give seedlings a fast connection to the network.