Northern Range Limit of Opuntia fragilis and the Cactaceae is 56°N, Not 58°N

Interaction of Diffuse Competition and Insect Herbivory in Limiting Brittle Prickly Pear Cactus, Opuntia fragilis (Cactaceae)

Aborted fruits of Opuntia microdasys (Cactaceae): insurance against reproductive failure.

New individuals in clonal populations arise through the recruitment of sexual or clonal offspring. The predominance of one type of regeneration over the other has been correlated with different selective environmental pressures. We compared the reproductive mode (sexual through seeds and vegetative through plantlets or detached cladodes) of Opuntia microdasys from three desert habitats of the C...

“Opuntia dillenii” – An Interesting and Promising Cactaceae Taxon

The origin, distribution, and taxonomy of Opuntia dillenii are reported and the various investigations are reviewed, which have been carried out with this cactus during the last 25 years. Biological and chemical characterization revealed properties typical of succulent plants and betalains as most noticeable constituents accompanied by flavonoids, other phenolics, ascorbic acid, and certain min...

the effect of task cognitive complexity and time limit on the performance of the learners with different proficiency levels in second language writing skill

this study investigated the effects of manipulating the cognitive complexity of tasks along +/- few elements and the time limits on l2 learners writing performance. to conduct the study, 60 iranian efl learners with two levels of proficiency, low and high intermediate, were selected and assigned to three groups based on the time devoted to task completion. the participants performed both a simp...

Isolation and characterization of a reserve protein from the seeds of Opuntia ficus-indica (Cactaceae).

We describe here the isolation and characterization of a major albumin from the seeds of Opuntia ficus-indica (Cactaceae). This protein has a molecular mass of 6.5 kDa and was isolated by a combination of gel filtration chromatography and reverse-phase HPLC. The amino acid composition of this protein was determined and it was shown to have similarities with the amino acid composition of several...