Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.
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针对近期网络上传闻称“格力电器未来每年将不再派发股息”，格力电器最新回应称，公司重视投资者回报，积极通过现金分红或股份回购等方式回报投资者，分红及回购金额均位于A股上市公司前列。公司未来分红安排将结合战略规划、经营业绩与资金状况综合研究确定。（证券时报）
Here is where computer science and neuroscience perfectly collided. In the 80s, AI engineers invented a Reinforcement Learning algorithm called Temporal Difference (TD) Learning to train software agents [4]. A decade later, neuroscientists measuring monkey brains realized that dopamine neurons fire in a pattern that perfectly matches the TD Error equation [5].