Carotenoids determine the yellow-red colours of many ornaments, which often function as signals of quality. Carotenoid-based signalling may reliably advertise health and should be particularly sensitive to parasite infections. Nematodes are among the commonest parasites of vertebrates, with well-documented negative effects on their hosts. However, to date, little is known about the effects that...

The tethered-nematode technique was adapted for use with second-stage juveniles of Meloidogyne incognita. The data demonstrate that M. incognita exhibits the same patterns of behavior as adults of the free-living nematode, Caenorhabditis elegans. The principal differences are that M. incognita is slower and less regular in its behavior than C. elegans. The frequency of normal waves is about 0.2...

石井直 明,鈴 木堅之:東 海大学医学部分子生物学教室 伊勢原市望星台 〒259-11 Nematode/Radiation/Aging The life-shortening effects of ultraviolet light (UV) and X-rays were investigated with a strain of free-living nematode, Rhabditidae tokai . UV exhibited a significant life-shortening effect on adult worms, and it also inhibited growth of larvae , hatching of eggs and reproduc tion. Sensitivity to UV was decreased with increa...