Could not find any links for specified country. Please check back later. Xylem is the world leader in tough, portable and reliable pumps for multiple applications. Our broad product range in combined with extensive application experience ensure the right solution that meets your specific needs. Submersible pumps can handle small drainage jobs to larger dewatering projects.
An obligate parasite, or holoparasite, is a parasitic organism that cannot complete its life-cycle without exploiting a suitable host. If an obligate parasite cannot obtain a host it will fail to reproduce.
Viruses have a genome of RNA or DNA which can replicate, but rely on a host cell for their metabolism. Thus, they are obligate intracellular parasites. Viruses enter cells by attaching to receptors, which are usually cell-surface molecules needed for normal cell function.