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He discovered nematodes and their eggs in the stomach of rats, and more importantly, the rats had stomach tumour . He found that some tumours were metastatic (cancerous), from which he built a hypothesis that the nematodes caused stomach cancer. After five years he experimentally demonstrated that the nematode could induce stomach cancer.
The nematode moves through pores in the soil, and finds a root to feed on. It inserts its stylet into an epidermal cell on the plant, feeds for a certain amount of time, then moves along to a different locations, and feeds on a different root. Diagram showing the life cycle of plant parasitic nematode, Mesocriconema Xenoplax
Once laid, eggs usually take about 5–10 days to hatch, 10–13 days to develop into adults, and about 2 days to become gravid. All of this equates to a 20-25 day life cycle from egg to gravid adult. [8] The nematode completes its life cycle in about 21 days at 25 °C. [9] Females and juveniles feed inside roots, especially near the tips.
The life cycle of a typical trematode begins with an egg. Some trematode eggs hatch directly in the environment (water), while others are eaten and hatched within a host, typically a mollusc. The hatchling is called a miracidium, a free-swimming, ciliated larva. Miracidia will then grow and develop within the intermediate host into a sac-like ...
The length of the life cycle is temperature-dependent. [16] [17] The relationship between rate of development and temperature is linear over much of the root-knot nematode life cycle, though it is possible the component stages of the life cycle, e.g. egg development, host root invasion or growth, have slightly
Females usually lay around 5,000 eggs per day, which is on par with reproductive rates of other nematodes within Strongyloidea. [13] For human hosts, the life cycle is very similar to that of Oesophagostomum in animals. It begins when an animal reservoir defecates into the soil, leaving feces infested with eggs that develop into rhabitiform ...
The mycophagous phase of the life cycle takes place in dead or dying wood, where the nematodes live and feed upon fungi, rather than the wood itself. The nematode cannot travel outside of the wood independently; it must be transported by an insect vector. B. xylophilus has the shortest life cycle of any known parasitic nematode. In laboratory ...
The direct counting of nematode eggs in feces is the method of choice for yearling animals, whereas in adult animals it may yield high variability due to a cow's immunity and low egg output. [41] Other biochemical methods have been developed to help more accurately diagnose O. ostertagi parasitism. These include the determination of specific ...