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Melanie Perkins (born 1987) is an Australian technology entrepreneur, who is the co-founder and chief executive officer of Canva.She owns 18% of the company. [3]Perkins is one of the youngest female CEOs of a tech start-up valued over A$ 1 billion.
Canva was founded in Perth, Australia, by Melanie Perkins, Cliff Obrecht and Cameron Adams on 1 January 2013. One of the companies' early investors included Susan Wu, an American entrepreneur. [11] In its first year, Canva had more than 750,000 users. [12] In April 2014, Guy Kawasaki joined the company as its chief evangelist. [13]
Clifford Obrecht (born 1985 or 1986) is an Australian billionaire technology entrepreneur, who is the co-founder (with Melanie Perkins) and chief operating officer (COO) of Canva and owns 18% of the company. [1]
Update: This article has been updated to include a statement from Starkey Water. A recent study by the Center for Environmental Health (CEH) has revealed high levels of metal arsenic in two brands ...
Arsenic is also found in food, water, soil, and air. [132] Arsenic is absorbed by all plants, but is more concentrated in leafy vegetables, rice, apple and grape juice, and seafood. [ 133 ] An additional route of exposure is inhalation of atmospheric gases and dusts. [ 134 ]
The Marsh test treats the sample with sulfuric acid and arsenic-free zinc. Even if there are minute amounts of arsenic present, the zinc reduces the trivalent arsenic (As 3+). Here are the two half-reactions: Oxidation: Zn → Zn 2+ + 2 e − Reduction: As 2 O 3 + 12 e − + 6 H + → 2 As 3− + 3 H 2 O. Overall, we have this reaction:
In its standard state arsine is a colorless, denser-than-air gas that is slightly soluble in water (2% at 20 °C) [1] and in many organic solvents as well. [citation needed] Arsine itself is odorless, [5] but it oxidizes in air and this creates a slight garlic or fish-like scent when the compound is present above 0.5 ppm. [6]
Inorganic arsenic and its compounds, upon entering the food chain, are progressively metabolized to a less toxic form of arsenic through a process of methylation. [7] Organoarsenic compounds arise via biomethylation of inorganic arsenic compounds, [ 8 ] via processes mediated by enzymes related to vitamin B 12 . [ 9 ]