the most common type of *porphyrin found in nature. It is a constituent of haemoglobin, myoglobin, most of the cytochromes, and the commoner chlorophylls.
Hard tick (ie tick with a hard dorsal scutum) belonging to the family Ixodidae. Includes amongst others, the genera Amblyomma, Dermacentor, Ixodes Rhipicephalus and Hyalomma.... ixodid
n. a genus of widely distributed parasitic ticks. Several species are responsible for transmitting *Lyme disease, *tularaemia, Queensland tick typhus, and *Russian spring-summer encephalitis. The bite of a few species can give rise to a serious paralysis, caused by a toxin in the tick’s saliva.... ixodes
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