可降解植入物（如骨钉）为什么能在身体里“完成任务后消失”，它靠什么被吸收？
Why can degradable implants like bone screws 'disappear after the job', and how are they absorbed?
它们用镁合金或聚乳酸等材料，在体液里逐渐水解或腐蚀成无害小分子，被身体代谢掉。骨折愈合后不必二次手术取出，减少痛苦和费用。
Made of magnesium alloy or polylactic acid, they slowly hydrolyze or corrode in body fluid into harmless small molecules that the body metabolizes. Once the bone heals, no second surgery is needed to remove them.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Ratner、Hoffman、Schoen & Lemons，《生物材料科学：医用材料导论》（第3版）
Ratner, Hoffman, Schoen & Lemons, 'Biomaterials Science: An Introduction to Materials in Medicine' (3rd ed.)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787302141884（豆瓣书目条目: 生物材料科学医用材料导论）
#可降解植入物 #镁合金 #水解
为什么有些手术缝线不用拆，时间久了会自动消失？
Why do some surgical stitches need no removal and vanish over time?
它们是可吸收缝线，由身体能分解的材料做成，伤口长好后就被体液慢慢溶掉。这样既缝住了伤口，又省了去医院拆线的麻烦。
They are absorbable sutures made of material the body can break down; once the wound heals, body fluid dissolves them. They hold the cut closed and spare you a removal visit.
难度 入门 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Ratner、Hoffman、Schoen & Lemons，《生物材料科学：医用材料导论》（第3版）
Ratner, Hoffman, Schoen & Lemons, 'Biomaterials Science: An Introduction to Materials in Medicine' (3rd ed.)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787302141884（豆瓣书目条目: 生物材料科学医用材料导论）
#可吸收缝线 #降解 #手术
微生物燃料电池为什么能一边处理污水一边发电，电是从哪来的？
Why can microbial fuel cells treat wastewater while generating power, and where does the electricity come from?
污水里的细菌在阳极“吃”有机物并释放电子，电子经外电路流向阴极形成电流，同时净化水质。相当于让微生物当免费的发电工人。
Bacteria at the anode 'eat' organics and release electrons that flow through an external circuit to the cathode, making current while cleaning water. It is like hiring microbes as free power workers.
难度 入门 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Logan，《微生物燃料电池》（2008）
Logan, 'Microbial Fuel Cells' (2008)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL9372252W：Microbial Fuel Cells（首版
#微生物燃料电池 #废水 #产电