On Sep 17, 8:56 pm, Billy wrote:
In article ,



"symplastless" wrote:
"Chris" wrote in message
...
On Sep 16, 6:57 pm, "symplastless" wrote:
"Chris" wrote in message

...
On Sep 14, 7:40 pm, "symplastless" wrote:

Thank you for your input.

Chris show me one per. table that identifies elements as nutrients.

--
Sincerely,
John A. Keslick, Jr.
Consulting Tree Biologistwww.treedictionary.com
andhttp://home.ccil.org/~treeman
Watch out for so-called tree experts who do not understand tree biology.
Storms, fires, floods, earthquakes, tornado's, volcanic eruptions and
other
abiotic forces keep reminding humans that they are not the boss.

The table I mentioned above (the one in Campbell & Reece) has is
titled "Plant Nutrients" and it has two columns. The first is divided
into two subsections, titled macronutrients and micronutrients.
Nitrogen, for example, is listed as a macronutrient. The second column
is titled, "Form available to plants." When we look there, we see the
(macro)nutrient nitrogen is available not as N or even N2, but only as
NO3- or NH4+. So the plants cannot absorb elemental nitrogen (the
common atmospheric form of which is N2) but they must get their
nitrogen as either nitrate or ammonia.

Note the difference between humans and plants here. Human nutrients
are commonly listed (and I have taught nutrition as well as General
Biology) as energy, protein, carbohydrate, lipid, water, minerals, &
vitamins.

God help your students. So what kind of energy are we talking here,
kinetic or potential?

Excuse me? Um, first off, energy is not so simplistic, I am afraid.
There are more kinds of energy than kinetic or potential- you know
that, right? There's thermal energy, and electromagnetic radiation
(like X-rays) neither of which can be classified as kinetic or
potential energy.

But the answer to your question, of course, is that it's chemical
energy. Chemical bonds retain energy, and breaking those bonds
releases the energy. Lipids contain more of those bonds, and more high-
energy bonds, than do carbohydrates or proteins, hence there are more
Calories/gram in fats than in the other two nutrients.

The most dangerous form of malnutrition goes by the acronym PEM, for
protein-energy malnutrition. In PEM we see a deficiency both in
essential amino acids and in caloric intake. In children this leads to
kwashiorkor- the poor kids with the hugely swollen bellies (a result
of an inability to move liquids back into the blood), and in adults it
manifests as marasmus, or wasting, where we see the body mobilizing
lean muscle tissue for energy. But note the name- "energy
malnutrition". Yes, energy is classified by nutritionists as a
nutrient. You're welcome to check any nutrition textbook.

Chris


Chris




Define element

define nutrient

define food

Define wise.
--

Billy
Bush and Pelosi Behind Barshttp://www.youtube.com/watch?v=9KVTfcAyYGg&ref=patrick.nethttp://www.haaretz.com/hasen/spages/1016232.html