polar axis

Listing 1 - 8 from 8 for polar axis

Glossary of Pollen and Spore Terminology - Part 2 (D-H)
... bridge. Equatorial diameter (Erdtman, 1943) A line, lying in the equatorial plane, perpendicular to the polar axis and passing through it. Comment: In bilateral palynomorphs the longest line is usually taken ... outline. Equatorial outline General description of the equator when a pollen grain is seen in polar view. Synonym of limb. See also: amb. Equatorial plane (Fgri and Iversen, 1950) The plane ...
www.biol.ruu.nl

Glossary of Pollen and Spore Terminology - Part 5 (S-Z)
... is on top, the proximal pole at the bottom, unless otherwise specified. e = equatorial view, p = polar view; H = high level, L = low level. The terms printed in bold are preferred. The colors ... Shape classes (pl.) (Erdtman, 1943) Categories of pollen and spore shape based on the relations between polar axis (P) and equatorial diameter (E). See also: oblate, oblate spheroidal, P/E ratio, peroblate, ...
www.biol.ruu.nl More from this site

FLORA OF NORTH AMERICA - Volume 1, Chapter 1
... the coast, not penetrating beyond the Appalachians or Cape Hatteras. Air masses converge along fronts. The Polar Front is the fundamental climatic phenomenon at midlatitudes,where temperature contrasts are sharpest. It consists ... separated from the mainland by Davis Strait (fig. 1.4); it constitutes most of Greenland. The north-south axis of the Greenland Shield is about 2700 km, and the east-west ...
hua.huh.harvard.edu

glossary E
... Embedded Appearing or growing as part of another structure. Endosperm Nutritive tissue near the embryo of the seed; develops from a fusion of polar nuclei and sperm nucleus. Entire A continuous margin without teeth or lobes. Epiblast A small, nonvasculated flap or flange of tissue on the side of the grass embryo axis opposite the scutellum. Equal Same length or ...
www.csdl.tamu.edu

Untitled
... the lion's share of what will be discussed with the students. Stem. A stem is the growing axis of a plant. Unlike animals, which seem to grow all over, plants grow only from definite points ( ... vegetation from the base of a tall mountain to its top as compared to heading toward the nearest polar region from the base of the same mountain. Alexander von Humbolt, explorer and biogeographer of the last ...
www.huntington.org

Centre for Plant Sciences
... In addition, auxin is unique among plant hormones in that its transport is both tightly regulated and polar, allowing auxin to carry directional intercellular and longer distance signals, and thus to act as a ... in ethylene signaling. Cell 115, 647-648 Kepinski, S. and Leyser, O. (2003) Plant Development: An Axis of Auxin. Nature 426, 132-135 Gray, W.M†., Kepinski, S.†., Rouse, D., Leyser, O., and ...
www.plants.leeds.ac.uk

Lab VII - The Origin of Seed Plants (1)
... of sterile and fertile axes. Note irregular branching pattern. (B) Centrarch protostele with protoxylem black and metaxylem drawn as individual cells. Note differentiated epidermis. (C) Elongated sporangia (polar and equatorial views) with longitudinal dehiscence. Some species of Psilophyton have abundant spines of various shapes and sizes on their stems; others are naked. Branching -- style, ...
www.ucmp.berkeley.edu

Documents and Settings\Emillies\Desktop\Images\fruits class 05\Chapter1
... of double fertilization occurs, involving two fusion events (hence the name, "double fertilization"): one generative nucleus unites with the egg nucleus, and the other generative nucleus unites with two polar nuclei, yielding the zygote and endosperm, respectively. You may want to review the details of double fertilization in one of the references listed below (which will show all of the other ...
www.uga.edu