Toxocariasis, or roundworm infection, is caused by a parasite that is commonly found in the intestines of dogs and cats. Roundworm eggs, which can survive for long periods of time in the environment, are present in infected dog and cat feces.oxocariasis, or roundworm infection, is caused by a parasite that is commonly found in the intestines of dogs and cats. Roundworm eggs, which can survive for long periods of time in the environment, are present in infected dog and cat feces.
A purine is a heterocyclic aromatic organic compound. It consists of a pyrimidine ring fused to an imidazole ring. Purines, which include substituted purines and their tautomers, are the most widely occurring nitrogen-containing heterocycle in nature.Purines and pyrimidines make up the two groups of nitrogenous bases, including the two groups of nucleotide bases.wo of the five bases in nucleic acids, adenine (2) and guanine (3), are purines. In DNA, these bases form hydrogen bonds with their complementary pyrimidines thymine and cytosine, respectively.
Two or three decades ago, purines were recognized for primary two reasons: (1) as building blocks for DNA (the primary genetic material in our cells) and (2) as substances that could be broken down to form uric acid and potentially increase our risk of gout.