The fauna of freshwater calanoid copepods in Japan in the early decades of the 21st Century: Implications for the assessment and conservation of biodiversity

2017 ◽  
Vol 63 (2) ◽  
pp. 758-772 ◽  
Author(s):  
Wataru Makino ◽  
Akifumi S. Tanabe ◽  
Jotaro Urabe
Keyword(s):  
21St Century ◽  
Calanoid Copepods ◽  
Conservation Of Biodiversity

Ultrastructural identification of three types of sensory setae on copepod antennae

1995 ◽  
Vol 53 ◽  
pp. 956-957
Author(s):  
T. M. Weatherby ◽  
P.H. Lenz
Keyword(s):  
Phase Locking ◽  
Membrane Surface ◽  
Reaction Times ◽  
High Sensitivity ◽  
Structural Features ◽  
Calanoid Copepods ◽  
Marine Food Webs ◽  
Dendritic Membrane ◽  
Ultrastructural Characterization

Crustaceans, as well as other arthropods, are covered with sensory setae and hairs, including mechanoand chemosensory sensillae with a ciliary origin. Calanoid copepods are small planktonic crustaceans forming a major link in marine food webs. In conjunction with behavioral and physiological studies of the antennae of calanoids, we undertook the ultrastructural characterization of sensory setae on the antennae of Pleuromamma xiphias.Distal mechanoreceptive setae exhibit exceptional behavioral and physiological performance characteristics: high sensitivity (<10 nm displacements), fast reaction times (<1 msec latency) and phase locking to high frequencies (1-2 kHz). Unusual structural features of the mechanoreceptors are likely to be related to their physiological sensitivity. These features include a large number (up to 3000) of microtubules in each sensory cell dendrite, arising from or anchored to electron dense rods associated with the ciliary basal body microtubule doublets. The microtubules are arranged in a regular array, with bridges between and within rows. These bundles of microtubules extend far into each mechanoreceptive seta and terminate in a staggered fashion along the dendritic membrane, contacting a large membrane surface area and providing a large potential site of mechanotransduction.

E-Learning: Educating the 21st Century Speech-Language Pathologist

ASHA Leader ◽  
2007 ◽  
Vol 12 (14) ◽  
pp. 24-25 ◽  
Author(s):  
Gloria D. Kellum ◽  
Sue T. Hale
Keyword(s):  
21St Century ◽  
Speech Language Pathologist ◽  
E Learning

1521: Turp Syndrome in the 21st Century: A Historical Event

2004 ◽  
Vol 171 (4S) ◽  
pp. 400-400
Author(s):  
Mark R. Young ◽  
Andrew R. Bullock ◽  
Rafael Bouet ◽  
John A. Petros ◽  
Muta M. Issa
Keyword(s):  
21St Century ◽  
Historical Event ◽  
Turp Syndrome
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