We have investigated the temporal pattern of appearance, cell lineage, and cytodifferentiation of selected sensory organs (sensilla) of adult Drosophila. This analysis was facilitated by the discovery that the monoclonal antibody 22C10 labels not only the neuron of the developing sensillum organ, but the accessory cells as well. The precursors of the macrochaetes and the recurved (chemosensory)...

Suppressor of Hairless (Su(H)) activity is zygotically required in larval imaginal discs for the singling out of adult sense organ precursor (SOP) cells: loss of Su(H) function results in too many proneural cluster cells adopting the SOP fate, while overexpression of the Su(H) protein prevents SOP specification. Su(H) null mutant alleles are recessive lethal at the late larval and early pupal s...

Numerous ring-width chronologies from different species have recently been developed in diverse tropical forests across South America. However, the temporal and spatial climate signals these is less well known. In this work, annual growth rings of Amburana cearensis, a widely distributed tree species, were employed to estimate patterns variability transition dry Chiquitano (16–17°S) humid Guara...

In some cyanobacteria, the color or prevalent wavelengths of ambient light can impact the protein or pigment composition of the light-harvesting complexes. In some cases, light color or quality impacts cellular morphology. The significance of changes in pigmentation is associated strongly with optimizing light absorption for photosynthesis, whereas the significance of changes in light quality-d...

The development of the external sensory organs in the adult Drosophila notum begins with the formation of sensory organ precursors (SOP) in the wing disc epithelium. The SOP divides along the anteroposterior (AP) axis to produce the IIa and IIb secondary precursors; the posterior IIa cell generates the external socket (tormogen) and hair (trichogen) cells, while the anterior IIb cell gives rise...