A combinatorial approach to angiosperm pollen morphology

A Combinatorial Approach toward Factors Empowering Developmental Coaches and Deputies

The present research has aimed to present a model for and identify the dimensions and components of empowering developmental coaches and deputies in high schools. Taking a mixed, exploratory approach, the research used the strategy derived from grounded theory in the qualitative section, while a descriptive-survey method was used in the quantitative section. The statistical population for the f...

Pollen Morphology of Rapateaceae

A Novel Combinatorial Approach to Discrete Fracture Network Modeling in Heterogeneous Media

Fractured reservoirs contain about 85 and 90 percent of oil and gas resources respectively in Iran. A comprehensive study and investigation of fractures as the main factor affecting fluid flow or perhaps barrier seems necessary for reservoir development studies. High degrees of heterogeneity and sparseness of data have incapacitated conventional deterministic methods in fracture network modelin...

Evolution of pollen morphology.

Over evolutionary time, the morphology of angiosperm pollen has evolved toward an increasing number of apertures, among other things. From a neo-Darwinian point of view, this means that (i) some polymorphism for aperture number must exist and (ii) there must be some fitness increase associated with increasing the aperture number. Pollen types with different aperture numbers often occur in the s...

Pollen clumping and wind dispersal in an invasive angiosperm.

Pollen dispersal is a fundamental aspect of plant reproductive biology that maintains connectivity between spatially separated populations. Pollen clumping, a characteristic feature of insect-pollinated plants, is generally assumed to be a detriment to wind pollination because clumps disperse shorter distances than do solitary pollen grains. Yet pollen clumps have been observed in dispersion st...