Any process that stops, prevents or reduces the frequency, rate or extent of leaf senescence.

Any process that activates or increases the frequency, rate or extent of leaf senescence.

Any process that modulates the frequency, rate or extent of sulfate assimilation.

Any process that activates or increases the frequency, rate or extent of sulfate assimilation.

The controlled release of arachidonic acid from a cell or a tissue.

The directed movement of an arachidonate into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

The controlled release of icosanoids, any of a group of C20 polyunsaturated fatty acids from a cell or a tissue.

Catalysis of the reaction: 5'-IMP + H2O = inosine + phosphate.

Catalysis of the reaction: a 5'-ribonucleotide + H2O = a ribonucleoside + phosphate.

Catalysis of the reaction: 5'-GMP + H2O = guanosine + phosphate.

Catalysis of an oxidation-reduction (redox) reaction in which X-H and Y-H form X-Y and the acceptor is disulfide.

Catalysis of the reaction: (S)-3-(4-oxo-4,5-dihydro-1H-imidazol-5-yl)propanoic acid + H(2)O = N-formimidoyl-L-glutamate + H(+).

Catalysis of the reaction: (S)-mandelate + 5,6,7,8-tetrahydrobiopterin + O(2) = (S)-4-hydroxymandelate + 7,8-dihydrobiopterin + H(2)O. (S)-2-hydroxy-2-phenylacetate is also known as S-mandelate.

Catalysis of the reaction: acetyl phosphate + sulfite = phosphate + sulfoacetaldehyde.

Catalysis of the reaction: UDP-glucose + ecdysteroid = UDP + glucosyl-ecdysteroid.

Any process that stops, prevents or reduces the frequency, rate or extent of a ceramide biosynthetic process.

Any process that decreases the rate, frequency or extent of sphingolipid biosynthesis. Sphingolipid biosynthesis is the chemical reactions and pathways resulting in the formation of sphingolipids, any of a class of lipids containing the long-chain amine diol sphingosine or a closely related base (a sphingoid).

OBSOLETE. Any positive regulation of transcription from RNA polymerase II promoter that is involved in calcium-mediated signaling.

OBSOLETE. Any process that modulates the frequency, rate or extent of replicative cell aging.