a circle of hairs formed from a modified CALYX found on the seeds of plants of the family Compositae, for example dandelion and thistle seeds. The pappus assists in the dispersal of the seeds by wind, acting as a kind of parachute. Collins Dictionary of Biology, 3rd ed. © W. G. Ha...
Pappus was the author ofMathematical Collectionsin eight books, only the last six of which are extant. The first two books were devoted to arithmetic, and the third through fifth books deal primarily with geometry. The sixth is on astronomy, the seventh contains a commentary on the works of ...
The arrangement of tissues around the central cavity is essential for changing holding angle To explore the importance of the observed apical plate geometry, we made some modifications to the geometry of the computational model and assessed the predicted holding angle,θ(Fig.6c–f). We found that...
The proposition that the volume of a solid of revolution generated by rotating a plane area about an axis in its own plane which does not intersect it is equal to the area multiplied by the length of the path of its centroid. A theorem of projective geometry which states that ifA,B, and...
During Late, MIS 2 upper treeline on the Colorado Plateau was significantly depressed, and alpine tundra regions may have supported more sage cover than is found there today. Today alpine vegetation is found in only three high mountain regions, at elevations above 3660 m. Late glacial coniferous...
We studied the resinous coating found on involucral bracts of Haplopappus platylepis Phil. (Asteraceae). This plant belongs to a speciose genus widely distributed in South America (Lane and Hartman in Am J Bot 83:356, 1996 ). H. platylepis is characterized by resinous fragrant leaves. In...
Differences in arthropods found in flowers versus trapped in plant resins on Haplopappus platylepis Phil. (Asteraceae): Can the plant discriminate between pollinators and herbivores?Differences in arthropods found in flowers versus trapped in plant resins on Haplopappus platylepis Phil. (Asteraceae):...
Heteropappus arenarius Kitam., an autumn-flowering biennial belonging to wild chrysanthemums, is found to be native in southeastern coastal area and Jeju island of Korea. It could play a good role for ground cover plants on a large-scale landscape area, especially, barren soil or sloping hillsid...
Gray. Nevertheless, considerable rates of protein and RNA synthesis were found in embryos grown in abscisic acid, at least during the early hours after sowing. On the contrary, seeds grown in cycloheximide + fusicoccin (a powerful promoter of cell expansion), where protein synthesis is almost ...
Therefore, allΗ atoms were placed in calculated posi-tions, although they could be found from Fourier difference maps. Discussion Taedol was previously isolated from the an EtOAc extract of dried and ground stems of Haplopappus taeda, without any dis-cussion about the stereochemistry [1], The ...