Transmitter contents of cells and fibers in the cephalic sensory organs of the gastropod mollusc Phestilla sibogae

2003 ◽  
Vol 314 (3) ◽  
pp. 437-448 ◽  
Author(s):  
Roger P. Croll ◽  
Dmitri Y. Boudko ◽  
Anthony Pires ◽  
Michael G. Hadfield
2001 ◽  
Vol 305 (3) ◽  
pp. 417-432 ◽  
Author(s):  
Roger Croll ◽  
Dmitri Boudko ◽  
Michael Hadfield

2002 ◽  
Author(s):  
Werner Kahle ◽  
Michael Frotscher

Author(s):  
Daniel King

This chapter investigates Plutarch’s On Flesh- Eating. This work, which contains two logoi, is traditionally taken as a highly rhetorical and ‘youthful’ piece which reflects Plutarch’s views on animal welfare and vegetarianism. This chapter argues that it investigates the ways in which one views another’s pain: it uses the torture of animals and our capacity to imagine this to interrogate questions about human society. On Flesh-Eating presents man as someone whose sensory organs and capacity for imagining another’s pain have been undermined by constant exposure to violence and inappropriate sights. Plutarch sets out to remedy this by forcing the reader to confront the distressing elements of animal consumption and, in so doing, to come to imagine the pain of the ultimate ‘other’.


2000 ◽  
Vol 51 (2-4) ◽  
pp. 433-437 ◽  
Author(s):  
Vasilina A. Dudicheva ◽  
Natalia M. Biserova
Keyword(s):  

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 559
Author(s):  
Lakshminath Kundanati ◽  
Prashant Das ◽  
Nicola M. Pugno

Aquatic predatory insects, like the nymphs of a dragonfly, use rapid movements to catch their prey and it presents challenges in terms of movements due to drag forces. Dragonfly nymphs are known to be voracious predators with structures and movements that are yet to be fully understood. Thus, we examine two main mouthparts of the dragonfly nymph (Libellulidae: Insecta: Odonata) that are used in prey capturing and cutting the prey. To observe and analyze the preying mechanism under water, we used high-speed photography and, electron microscopy. The morphological details suggest that the prey-capturing labium is a complex grasping mechanism with additional sensory organs that serve some functionality. The time taken for the protraction and retraction of labium during prey capture was estimated to be 187 ± 54 ms, suggesting that these nymphs have a rapid prey mechanism. The Young’s modulus and hardness of the mandibles were estimated to be 9.1 ± 1.9 GPa and 0.85 ± 0.13 GPa, respectively. Such mechanical properties of the mandibles make them hard tools that can cut into the exoskeleton of the prey and also resistant to wear. Thus, studying such mechanisms with their sensory capabilities provides a unique opportunity to design and develop bioinspired underwater deployable mechanisms.


Author(s):  
Vincent Fleury ◽  
Alexis Peaucelle ◽  
Anick Abourachid ◽  
Olivia Plateau

Genetics ◽  
2000 ◽  
Vol 155 (2) ◽  
pp. 733-752 ◽  
Author(s):  
Salim Abdelilah-Seyfried ◽  
Yee-Ming Chan ◽  
Chaoyang Zeng ◽  
Nicholas J Justice ◽  
Susan Younger-Shepherd ◽  
...  

Abstract The Drosophila adult external sensory organ, comprising a neuron and its support cells, is derived from a single precursor cell via several asymmetric cell divisions. To identify molecules involved in sensory organ development, we conducted a tissue-specific gain-of-function screen. We screened 2293 independent P-element lines established by P. Rørth and identified 105 lines, carrying insertions at 78 distinct loci, that produced misexpression phenotypes with changes in number, fate, or morphology of cells of the adult external sensory organ. On the basis of the gain-of-function phenotypes of both internal and external support cells, we subdivided the candidate lines into three classes. The first class (52 lines, 40 loci) exhibits partial or complete loss of adult external sensory organs. The second class (38 lines, 28 loci) is associated with increased numbers of entire adult external sensory organs or subsets of sensory organ cells. The third class (15 lines, 10 loci) results in potential cell fate transformations. Genetic and molecular characterization of these candidate lines reveals that some loci identified in this screen correspond to genes known to function in the formation of the peripheral nervous system, such as big brain, extra macrochaetae, and numb. Also emerging from the screen are a large group of previously uncharacterized genes and several known genes that have not yet been implicated in the development of the peripheral nervous system.


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