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1. Depilation increases while hairiness decreases the risk of drowning: a hitherto unappreciated survival role of setae in woolly bear caterpillars of the moth Lemyra imparilis (Lepidoptera: Noctuoidea: Erebidae)

Creator:
Meyer-Rochow, V. Benno
Format:
print, počítač, and online zdroj
Type:
article, články, journal articles, model:article, and TEXT
Subject:
Zoologie, motýli, butterflies, Lepidoptera, Erebidae, Lemyra imparilis, insect setae, cuticle, wettability, floating, 2, and 59
Language:
English
Description:
This note aims to put on record a hitherto unreported function of caterpillar setae supplementary to those already known. When woolly bear caterpillars of the moth Lemyra imparilis (Butler) have their body hairs removed and are dropped into a bucket of water from a height of 30 cm, they sink immediately. Caterpillars, however, with an intact coat of hairs usually float. This hitherto unreported role of caterpillar setae as life-rafts should depend on a high contact angle θe, and thus on the position, density and dimensions of the hairs. An SEM examination of the surface structure of the setae revealed a system of fine grooves and small distally pointing barbs on the hair shaft, which can trap air to support the weight of the insect. Insect setae generally and body hairs of caterpillars in particular are known to possess many functions, but a role as life-rafts for caterpillars in danger of drowning can now be added to the list of possible uses of body hairs., V. Benno Meyer-Rochow., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. Floating - zapomenutá relaxační technika?

Creator:
Kavková, Veronika, Malůš, Marek, Taušová, Jitka, and Válková, Hana
Type:
article, model:article, and TEXT
Subject:
floating, relaxace, REST, technika omezené zevní stimulace, léčebná technika, flotation, relaxation, restricted environmental stimulation technique, and medical technology
Language:
Czech
Description:
Floating je doposud poměrně málo známou relaxační technikou. Ačkoli byla vynalezena již v 2. polovině 20. století, ještě se nestačila dostat do širšího povědomí jak veřejnosti, tak odborníků. Principem této techniky je pobyt v ničím nerušeném prostředí vodní nádrže ve tvaru vajíčka, naplněné hustým solným roztokem, umožňujícím se jako by vznášet. Odtud také název samotné techniky. Podmínky této techniky, omezující vnější rušivé stimuly, umožňují zažít hlubší pocit relaxace než u běžně dostupných relaxačních metod. Tento příspěvek se zaměřuje na připomenutí techniky floating a zmapování dosavadních poznatků o jejím relaxačním účinku. V textu je věnován prostor dostatečnému popisu této techniky, způsobu jejího využití jakožto relaxačního nástroje, dále je část textu věnována i historickému kontextu vývoje floatingu. V závěru se potom můžeme dočíst o pravidlech využívání této techniky a případných rizicích s ní spojených. and Floating is still a relatively little known relaxation technique. Although it was already invented in the second half of the 20th century, it still does not reach wider awareness of both the public and professionals. The principle of this technique is to stay in an undisturbed environment of a water tank in the shape of an egg, filled with a dense saline solution allowing „floating“. Hence the name of the technique itself. The conditions of this technique, restricting intrusive external stimuli, allow the experience of deeper relaxation than commercially available relaxation methods. This paper focuses on reminding and mapping existing knowledge of the relaxing effect of floating. In the text, sufficient space is dedicated to the description of this technique, to the method of its use as a relaxation tool and also to the historical context of the development of floating. A final part treats the rules for the use of this technique and potential risks associated with it.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public