Any process that increases the frequency or rate of activation of JAK (Janus Activated Kinase) protein. The activation of JAK protein is the process of introducing a phosphate group to a tyrosine residue of a JAK (Janus Activated Kinase) protein, thereby activating it.

Any process that activates or increases the frequency, rate or extent of the phosphorylation of peptidyl-tyrosine.

The unidirectional movement of auxin from the base towards the apex of an organ, including the shoot, leaf, primary root, or lateral root.

Enables the transfer of nitrate from the inside of the cell to the outside of the cell across a membrane.

The process whose specific outcome is the progression of the embryo sac over time, from its formation to the mature structure. The process begins with the meiosis of the megasporocyte to form four haploid megaspores. Three of the megaspores disintegrate, and the fourth undergoes mitosis giving rise to a binucleate syncytial embryo sac. The two haploid nuclei migrate to the opposite poles of the embryo sac and then undergo two rounds of mitosis generating four haploid nuclei at each pole. One nucleus from each set of four migrates to the center of the cell. Cellularization occurs, resulting in an eight-nucleate seven-celled structure. This structure contains two synergid cells and an egg cell at the micropylar end, and three antipodal cells at the other end. A binucleate endosperm mother cell is formed at the center. The two polar nuclei fuse resulting in a mononucleate diploid endosperm mother cell. The three antipodal cells degenerate.

The process whose specific outcome is the progression of the gametophyte over time, from its formation to the mature structure. The gametophyte is the gamete-producing individual or phase in the life cycle having alternation of generations. An example of this process is found in Arabidopsis thaliana.

Any process that modulates the rate or frequency of platelet activation. Platelet activation is a series of progressive, overlapping events triggered by exposure of the platelets to subendothelial tissue.

Any process that modulates the frequency, rate or extent of cell activation, the change in the morphology or behavior of a cell resulting from exposure to an activating factor such as a cellular or soluble ligand.

A plasmodesma that consists of a simple, single channel; found predominantly in young tissue and formed as a function of cell plate formation during cytokinesis.

A plasmodesma with a branched structure, often with many channels leading into a larger central cavity; found in older tissues and usually derived from preexisting primary plasmodesmata.

Any process that decreases the rate or frequency of platelet activation. Platelet activation is a series of progressive, overlapping events triggered by exposure of the platelets to subendothelial tissue.

Any process that stops, prevents, or reduces the frequency, rate or extent of cell activation.

The process in which the microsporocyte undergoes meiosis, giving rise to four haploid microspores.

The formation of plant spores derived from the products of meiosis. The spore gives rise to gametophytes.

Binding to a box C/D small nucleolar RNA.

Binding to a small nucleolar RNA.

The process in which an uncellularized nucleus cellularizes and acquires the specialized features of an antipodal cell.

Binding to a box H/ACA small nucleolar RNA.