RE: Round Up
Roundup IS a contact spray - but it does not kill on contact. Up to 2 weeks can be required to effectively kill the plant - If you disk & plant the same day as spraying - roundup will not be very effective.
QUOTE Below - I did not write this:
"The active ingredient of Roundup is the isopropylamine salt of glyphosate Glyphosate (N-(phosphonomethyl) glycine, C3H8NO5P) is used as a non-selective herbicide to kill weeds, especially perennials.
It kills plants by inhibiting their ability to make aromatic amino acids, which is an interesting target since only plants and microorganisms have this metabolic pathway. Some new crops have been bred to be resistant to it.
The name is a contraction of glycine, phospho-, and -ate. It was first sold by Monsanto under the tradename Roundup but is no longer under patent so is now marketed under various names.
..... Click the link for more information. . Glyphosate's mode of action is to inhibit an enzyme An enzyme is a protein, or protein complex, that catalyzes a chemical reaction in an organism. Within biological cells many chemical reactions occur, but without enzymes they would happen too slowly to sustain life. Enzymes speed up reactions by a factor of one thousand times or more.
An RNA enzyme or "ribozyme" is made of RNA instead of protein. Generally ribozymes only catalyze RNA splicing.
..... Click the link for more information. involved in the synthesis of the amino acids In chemistry, an amino acid is any molecule that contains both amino and carboxylic acid functional groups. In biochemistry, this shorter and more general term is frequently used to refer to alpha amino acids: those amino acids in which the amino and carboxylate functionalities are attached to the same carbon.
OverviewAmino acids are biochemical building blocks. They form short chemical chains called polypeptides or peptides which in turn form structures called proteins (see below).
..... Click the link for more information. tyrosine
Tyrosine (from the Greek tyros, for "cheese", where it was first discovered), 4-hydroxyphenylalanine, or 2-amino-3(4-hydroxyphenyl)-propanoic acid, is one of the 20 amino acids that are used by cells to synthesize proteins. It plays a key role in signal transduction, since it can be tagged (phosphorylated) with a phosphate group by protein kinases to alter the functionality and activity of certain enzymes. Other important biological functions of tyrosine are as a precursor of the thyroid hormone, thyroxine and of the biologically active catecholamines, dopamine, noradrenaline and adrenaline.
..... Click the link for more information. , tryptophan Tryptophan is an amino acid and essential in human nutrition. It is one of the 20 amino acids in the genetic code (codon UGG), and its symbol is Trp or W.
Molecular formula: C11H12N2O2
Molecular weight: 204.23
Isoelectric point: pH 5.89
CAS number: 73-22-3
Tryptophan is also a precursor for serotonin, a neurotransmitter, and melatonin, a neurohormone.
..... Click the link for more information. , and phenylalanine
The amino acid Phenylalanine exists in two forms, the D- and L- forms. L-Phenylalanine(LPA, C9H12NO2) is a neutral amino acid found in proteins, coded for by DNA. Its mirror image, D-phenylalanine (DPA), can be synthesized artificially.
L-phenylalanine is used in the human body, where it is an essential amino acid. L-Phenylalanine can also be converted into tyrosine. Tyrosine is converted into L-dopa, norepinephrine, and epinephrine. D-phenylalanine can only be converted into phenylethylamine.
..... Click the link for more information. . It is absorbed through foliage and translocated to growing points. Because of this mode of action it is only effective on actively growing plants; it is not effective as a pre-emergence herbicide. Due to the absorption being limited to foliage, soil-bound glyphosate is effectively inert. "
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