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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
22/09/1995 |
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Data da última atualização: |
22/09/1995 |
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Autoria: |
HOPKINS, C. A.; ALLEN, L. M. |
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Título: |
Hymenolepis diminuta: the role of the tail in determining the position of the worm in the intestine of the rat. |
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Ano de publicação: |
1979 |
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Fonte/Imprenta: |
Parasitology, v.79, n.3, p.401-410, 1979. |
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Idioma: |
Inglês |
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Conteúdo: |
One-worm infecions of Hymenolepsis diminuta in rats had their strobila severed surgically,
in the neck region, on day 14 of an infection. The scolex and remaining strobila survived
but were recovered from a more posterior region of the intestine where small worms are at-
tached during development. The movement to the new region was usually not complete
in 24 h, but was complete by 72 h, and probably by 48 h. The operation, involving laparo-
tomy and an incision in the duodenal wall which avoided severing the strobila, had no ef-
fect on the position of the worm but did depress the growth of the worm during the ensu-
ing 24 h. It is suggested that (1) the preferred site of H. diminuta is 30-50% down the small
intestine, (2) the worm monitors information about its position from all over its strobilla and (3) as the worm grows, its position is determined by balancing the input of adverse informa-
tion from its tail and head ends. The slowness with which surgically shortened worms re-
turn to the preferred site may be due either to delay in the worm 'realising' it has no tail, or
to the location stimuli in the intestine being disturbed for 24 h by the operation. |
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Palavras-Chave: |
Lombriga; Parasita; Parasite; Worm. |
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Thesagro: |
Infecção. |
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Thesaurus Nal: |
Hymenolepis diminuta; infection. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01771naa a2200217 a 4500
001 1786290
005 1995-09-22
008 1979 bl --- 0-- u #d
100 1 $aHOPKINS, C. A.
245 $aHymenolepis diminuta$bthe role of the tail in determining the position of the worm in the intestine of the rat.
260 $c1979
520 $aOne-worm infecions of Hymenolepsis diminuta in rats had their strobila severed surgically, in the neck region, on day 14 of an infection. The scolex and remaining strobila survived but were recovered from a more posterior region of the intestine where small worms are at- tached during development. The movement to the new region was usually not complete in 24 h, but was complete by 72 h, and probably by 48 h. The operation, involving laparo- tomy and an incision in the duodenal wall which avoided severing the strobila, had no ef- fect on the position of the worm but did depress the growth of the worm during the ensu- ing 24 h. It is suggested that (1) the preferred site of H. diminuta is 30-50% down the small intestine, (2) the worm monitors information about its position from all over its strobilla and (3) as the worm grows, its position is determined by balancing the input of adverse informa- tion from its tail and head ends. The slowness with which surgically shortened worms re- turn to the preferred site may be due either to delay in the worm 'realising' it has no tail, or to the location stimuli in the intestine being disturbed for 24 h by the operation.
650 $aHymenolepis diminuta
650 $ainfection
650 $aInfecção
653 $aLombriga
653 $aParasita
653 $aParasite
653 $aWorm
700 1 $aALLEN, L. M.
773 $tParasitology$gv.79, n.3, p.401-410, 1979.
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Registro original: |
Embrapa Pantanal (CPAP) |
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