Mrs. Pfahnl’s Bio A Lab DNA Extraction
Purpose: Extract DNA from fruits at home.
教育系列（1）青少年逆反：家长问答及讨论（一A）
作者雷春 “ 交流与厌学： @雷春 孩子不愿意和父母交流，有些什么切实可行的办法改善情况？ @Ja…
作者： 凯波
凯波 是中山大学校友，教育专栏编辑。
雷春是本站第一位作者，也是中大校友。
Mrs. Pfahnl’s Bio A Lab DNA Extraction
Mrs. Pfahnl’s BioA Lab Fermentation 2 Yeast Dough
Mrs. Pfahnl’s BioA Lab: Fermentation 2 Yeast Dough
Yeast is an eukaryote. It is a single cell fungi. Bacteria is a prokaryote.
The products from yeast fermentation are carbon dioxide and ethanol. This is why using store bought yeast you can make bread without sour taste. The carbon dioxide in the dough causes the volume to rise.
Sourdough is fermented by a mixture of bacteria and acid tolerable yeast. Similar to bacteria making yogurt, lactatic acid is one of the byproducts. That is why it tastes sour. It takes longer time for yeast in sourdough to produce carbon dioxide and ethanol.
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Mrs. Pfahnl’s Bio A Lab: Fermentation 1 Yogurt
Mrs. Pfahnl’s Bio A Lab: Fermentation 1 Yogurt
Fermentation does not require Oxygen. There are two types of fermentation: Lactic acid and alcohol. Yogurt making is similar to our muscle during excise which produces lactic acid.
Purpose: Observe changes during milk fermentation process.
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Mrs. Pfahnl’s Bio A Lab: Osmosis
Mrs. Pfahnl’s Bio A Lab: Osmosis
Osmosis is a passive transportation of water molecules through semipermeable cell membrane.
The purpose of the experiment is to investigate the different salt levels affects the intake or output of the water molecules of plant cells.
Mrs. Pfahnl’s Bio A Lab: Catalase
Mrs. Pfahnl’s Bio A Lab: Catalase
September 29, 2020 Purpose: Investigate catalase activities in different fruits or vegetables.
Materials:
雷春杂文：疫情里美国高中开学历险记
雷春杂文：疫情里美国高中开学历险记
写于2020年8月28日 星期五
终于感到可以透一口气了。
第一周 预备教学、一片混沌
我所在的高中，8月11日开学前，一直准备着以Hybrid的教学方式，让近一半的学生回到教室，另一半异步线上学习，两天一互换，老师四天授课，一天备课。但8月5日，老师工作日开始后才两天时间，就接到当地卫生部门的通知，新冠检验能力和速度跟不上开学的需要，要求学校全面网课。新生只能分成不到20人的小组，去学校领书、接受基本电脑使用培训。