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- W1982485110 abstract "Depending on its concentration, sodium chloride acts as either an attractant or a repellant to the infective larvae (L3i) of Strongyloides stercoralis. On a concentration gradient, L3i are attracted to 0.05 M NaCl, but repelled by 2.8M. To test the hypothesis that amphidial neurons ASE and ASH might mediate attraction and repulsion, respectively, these neurons, and control neurons as well, were ablated in hatchling larvae with a laser microbeam. After the larvae attained infectivity (L3i), they were tested on a NaCl gradient. When placed at low salinity, 73.5% of normal controls migrated up the gradient, while 26.4% crawled randomly. In contrast, only 20.6% of ASE-ablated L3i migrated up the gradient, while 79.4% migrated randomly. Ablation-control ASK-ablated L3i (58.8%) migrated up the gradient while 41.1% crawled randomly. When placed at a region of high salinity, 100% of normal control L3i migrated down the gradient, whereas 62.5% of ASH-ablated L3i migrated randomly, the remaining 37.5% migrating down the gradient. In sharp contrast with ASH-ablated L3i, 94.1% of ablation-control larvae, i.e. ASK-ablated L3i, migrated down the gradient. Migration behavior of ASE- and ASH-ablated L3i was significantly different (P < 0.001) from that of ASK-ablated L3i and normal controls. It is noteworthy that 87.5% of ASE-ablated L3i that failed to exhibit chemoattractive behavior were actively chemorepelled from high salinity. Also, 70.0% of ASH-ablated L3i that failed to be chemorepelled from high salinity were capable of chemoattractive behavior, indicating that the worms had retained their behavioral responses except for those associated with the targeted neurons." @default.
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- W1982485110 date "2004-03-01" @default.
- W1982485110 modified "2023-10-10" @default.
- W1982485110 title "Chemoattraction and chemorepulsion of Strongyloides stercoralis infective larvae on a sodium chloride gradient is mediated by amphidial neuron pairs ASE and ASH, respectively" @default.
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- W1982485110 doi "https://doi.org/10.1016/j.vetpar.2004.01.005" @default.
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