与 «PLUMULACEOUS»相关的英语书籍
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plumulaceous的用法。与
plumulaceous相关的书籍以及同一来源的简短摘要提供其在 英语文献中的使用情境。
1
Shifting Topology of Stem Cells and Molecular Expression ...
It is referred to as the plumulaceous barbules. Plumulaceous barbules are seen
in the downy part of the contour feathers (Lucas and Stettenheim, 1972). The
distal end of contour feathers are coarse and flat and the barbules at the distal
end ...
2
Rise of the Dragon: Readings from Nature on the Chinese ...
A clump of at least six plumulaceous feathers is preserved anterior to the chest,
with some showing well-developed vanes (Fig. 3a). Evenly distributed
plumulaceous feathers up to 27 mm long are associated with ten proximal caudal
vertebrae.
3
Taking Wing: Archaeopteryx and the Evolution of Bird Flight
The answer depends on which type of feather evolved first, for birds have
pennaceous and plumulaceous feathers that serve different purposes. Flight
feathers and body contour feathers are classified as pennaceous feathers; they
have the ...
4
Current Topics in Developmental Biology
It was then subdivided over time to form pennaceous and then plumulaceous
feather types (Regal, 1975) (Fig. 5, Model 1). Thus, the order of formation is
scales ! elongated scales ! the vanelike scale plates ! partial pennaceous vanes
with an ...
5
Functional Surfaces in Biology: Little Structures with Big ...
9.6 and 9.9V), naked or branched plumulaceous feathers were produced in both
theropods and birds of the Mesozoic Era, as is indicated in the fossil record.
Plumulaceous feathers however produced a limited shape variation, related to ...
6
Natural Fibers, Plastics and Composites
The plumulaceous feathers generally have lengths up to 4.1 centimeters (cm),
while the lengths of the pennaceous feathers range up to approximately 5.2 cm [9
]. The linear density of the fibers was measured according to ASTM standard ...
Frederick T. Wallenberger, Norman E. Weston, 2004
7
The Dinosauria: Second Edition
Feathers and integumentary structures in nonavian dinosaurs: A, caudal dorsal
region of Sinosauropteryx, showing filamentous integumentary fibers; B, tail
feather of Protarchaeopteryx; C, isolated plumulaceous feathers of
Protarchaeopteryx; ...
David B. Weishampel, Peter Dodson, Halszka Osmólska, 2004
8
Dinosaur Sculpting: A Complete Guide, 2d ed.
Many dinosaurs that are known to have been feathered did not possess flight
feathers. Their feathers are of the plumulaceous, downy or fluffy variety,
functional for insulation and possibly visual display, but not supportive of flight. It
has been ...
Allen A. Debus, Bob Morales, Diane E. Debus, 2013
9
A Field Guide to Mesozoic Birds and Other Winged Dinosaurs
of the bird's lifestyle. This degeneration of the remiges appears to be a general
trend in birds as they lose flight, probably because vaned feathers are more
costly to maintain than plumulaceous or semiplume feathers. Novel feather types
that ...
Closed pennaceous section Contour feathers (symmetrical or planar vane) Flight
feather (asymmetrical vane) Open pennaceous section Plumulaceous (downy)
section Calamus Contour feathers cover the body. They can be of various length
...
