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Purine is a heterocyclic aromatic organic compound that consists of two rings (pyrimidine and imidazole) fused together. It is water-soluble. Purine also gives its name to the wider class of molecules, purines, which include substituted purines and their tautomers. They are the most widely occurring nitrogen-containing heterocycles in nature. [1]
Haig's uric-acid free diet (known as Haig's diet) required the elimination of every food containing high amounts of purines that could be metabolized into uric acid. [16] On this diet all meats, legumes and some vegetables were eliminated including asparagus , beans , lentils , mushrooms , peas and whole grain products. [ 16 ]
Purines are biologically synthesized as nucleotides and in particular as ribotides, i.e. bases attached to ribose 5-phosphate.Both adenine and guanine are derived from the nucleotide inosine monophosphate (IMP), which is the first compound in the pathway to have a completely formed purine ring system.
Non-starchy vegetables are vegetables that contain a lower proportion of carbohydrates and calories compared to their starchy counterparts. Thus, for the same calories, one can eat a larger quantity of non-starchy vegetables compared to smaller servings of starchy vegetables.
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Some well known perennial vegetables from the temperate regions of the world include asparagus, artichoke and rhubarb. In the tropics, cassava and taro are grown as vegetables, and these plants can live many years. Some perennial plants are cultivated as annuals in order to minimise pest pressure (e.g., potato, Solanum tuberosum).
This is a list of vegetables which are grown or harvested primarily for the consumption of their leafy parts, either raw or cooked. Many vegetables with leaves that are consumed in small quantities as a spice such as oregano , for medicinal purposes such as lime , or used in infusions such as tea , are not included in this list.
Asparagales (asparagoid lilies) are a diverse order of flowering plants in the monocots.Under the APG IV system of flowering plant classification, Asparagales are the largest order of monocots with 14 families, [5] 1,122 genera, and about 36,000 species, with members as varied as asparagus, orchids, yuccas, irises, onions, garlic, leeks, and other Alliums, daffodils, snowdrops, amaryllis ...