细菌的鞭毛是如何驱动运动的？
How do bacterial flagella drive movement?
细菌鞭毛是由鞭毛蛋白构成的旋转螺旋丝，基部有类似马达的基体和质子通道，靠质子动势驱动其像螺旋桨一样旋转，推动菌体前进或翻滚转向。其结构与真核细胞的鞭毛（微管构成、波浪摆动）完全不同。
A bacterial flagellum is a helical filament of flagellin with a motor-like basal body and proton channel at its base; proton motive force spins it like a propeller to push the cell forward or tumble to change direction. Its design is entirely different from eukaryotic flagella, which are microtubule-based and beat in waves.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《微生物学》
Brock Biology of Microorganisms
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787122008411（豆瓣书目条目: 微生物学）
#鞭毛 #鞭毛蛋白 #质子动势 #运动
补体系统通过哪些途径被激活，又如何清除病原体？
What pathways activate the complement system, and how does it eliminate pathogens?
补体是血浆中的一组酶原蛋白，经三条途径激活：经典途径（IgG/IgM与病原结合后C1q识别）、凝集素途径（甘露糖结合凝集素MBL识别病原表面糖类）、替代途径（病原表面自发低水平激活并被正反馈放大），三者汇合于C3转化酶，形成C5转化酶后启动膜攻击复合物。效应包括：C3b沉积在病原表面调理促进吞噬；C5b-C9膜攻击复合物在革兰阴性菌膜上打孔使其裂解；C3a、C5a等过敏毒素招募并激活吞噬细胞。宿主自身细胞表面有衰变加速因子（DAF）、CD59等调节蛋白防止补体误伤。
Complement is a group of plasma zymogens activated via three routes: the classical pathway (C1q recognizes IgG/IgM bound to pathogens), the lectin pathway (mannose-binding lectin recognizes microbial sugars), and the alternative pathway (spontaneous low-level activation on pathogen surfaces amplified by positive feedback). They converge on C3 convertase, then C5 convertase, and finally the membrane attack complex. Effector functions include: C3b opsonizing pathogens for phagocytosis; C5b-C9 forming membrane attack complexes that lyse Gram-negative bacteria; and the anaphylatoxins C3a/C5a recruiting and activating phagocytes. Host cells carry regulators such as decay-accelerating factor (DAF) and CD59 to prevent self-damage.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03
来源 · Source
《细胞生物学》（免疫学章节）
Cell Biology (Zhai Zhonghe, et al.), immunology (complement)
#补体系统 #膜攻击复合物 #调理作用
B细胞为什么能产生种类极其多样的抗体？
How can B cells generate an enormous diversity of antibodies?
抗体的多样性主要由V(D)J基因重组产生。B细胞在骨髓发育过程中，免疫球蛋白重链基因的V、D、J基因片段和轻链的V、J片段被RAG1/RAG2重组酶随机剪切并连接，产生数百万到上亿种组合，构成初级抗体库。不同片段的随机组合，加上连接处的多样性（插入/删除核苷酸），使每个B细胞拥有独特的抗体基因。抗原激活后，体细胞高频突变（SHM）和类别转换（从IgM/IgD转为IgG、IgA、IgE）进一步优化抗体的亲和力和效应功能。
Antibody diversity is generated chiefly by V(D)J recombination. As B cells develop in the bone marrow, V, D, and J gene segments of the immunoglobulin heavy chain (and V, J segments of the light chain) are randomly cut and joined by the recombinases RAG1 and RAG2, generating millions to hundreds of millions of combinations, the primary antibody repertoire. Random segment combination plus junctional diversity (nucleotide insertion or deletion) gives each B cell a unique antibody gene. After antigen activation, somatic hypermutation (SHM) and class switching (from IgM/IgD to IgG, IgA, or IgE) further refine affinity and effector function.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#V(D)J重组 #抗体多样性 #体细胞高频突变
逆转录病毒（如HIV）是如何把自己的遗传信息插入宿主基因组的？
How do retroviruses such as HIV insert their genetic information into the host genome?
逆转录病毒携带逆转录酶，进入宿主细胞后以自身RNA为模板合成DNA，再由整合酶把这段DNA插入宿主染色体，随细胞分裂永久保留。正因为病毒DNA成了宿主基因组的一部分，艾滋病才如此难以根治。
Retroviruses carry reverse transcriptase that copies their RNA genome into DNA inside the host cell, and an integrase then inserts that DNA into the host chromosome, where it persists permanently through cell division. Because the viral DNA becomes part of the host genome, HIV is especially hard to cure.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：作者 / 书名 / 版次 / 出版社 / 年份齐备，仅缺独立比对证据；已在可信度报告单列披露，不再重复核验。
Coffin、Hughes 与 Varmus，《逆转录病毒》（冷泉港实验室出版社，1997）
Coffin, Hughes & Varmus, Retroviruses (Cold Spring Harbor Laboratory Press, 1997)
#逆转录病毒 #逆转录酶 #病毒整合
细菌和古菌有什么重要区别？
What are the key differences between bacteria and archaea?
细菌和古菌都是原核生物，但古菌的细胞膜脂类、细胞壁成分和核糖体 RNA 与细菌差异显著，在演化上更接近于真核生物。许多古菌生活在极端环境（如高温热泉、高盐湖），而细菌分布更为广泛。
Both are prokaryotes, but archaea differ markedly from bacteria in membrane lipids, cell-wall composition, and ribosomal RNA, and are evolutionarily closer to eukaryotes. Many archaea thrive in extremes (hot springs, salt lakes), whereas bacteria are more broadly distributed.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《自然·综述：微生物学》（Nature Reviews Microbiology）；美国微生物学会（ASM）
Nature Reviews Microbiology; American Society for Microbiology (ASM)
#细菌 #古菌 #原核生物
自身免疫病是如何发生的？主要的耐受失效机制有哪些？
How do autoimmune diseases arise, and what are the main mechanisms of tolerance breakdown?
机体通过中枢耐受（胸腺中T细胞阴性选择、骨髓中B细胞克隆清除）和外周耐受（调节性T细胞Treg、克隆无能、免疫赦免部位）淘汰或抑制对自身抗原反应的淋巴细胞。自身免疫病源于这些机制失效：如分子模拟（A组链球菌蛋白与心肌抗原相似，引发风湿性心脏病）、隐蔽抗原暴露（眼晶状体、精子等免疫赦免部位抗原因创伤释出）、Treg数量或功能缺陷、以及MHC易感基因（如HLA-DR4与类风湿关节炎）。例：1型糖尿病（自身反应性T细胞破坏胰岛β细胞）、Graves病（自身抗体刺激TSH受体）、重症肌无力（抗乙酰胆碱受体抗体阻断神经肌肉接头）。
The body eliminates or suppresses self-reactive lymphocytes through central tolerance (negative selection of T cells in the thymus, clonal deletion of B cells in the marrow) and peripheral tolerance (regulatory T cells, anergy, immune-privileged sites). Autoimmune disease arises when these fail, through mechanisms such as molecular mimicry (group A streptococcal proteins resemble cardiac antigens, causing rheumatic heart disease), release of sequestered antigens (immune-privileged antigens like lens and sperm exposed after injury), defects in Treg number or function, and susceptibility MHC alleles (e.g., HLA-DR4 in rheumatoid arthritis). Examples include type 1 diabetes (autoreactive T cells destroy pancreatic beta cells), Graves' disease (autoantibodies stimulate the TSH receptor), and myasthenia gravis (anti-acetylcholine-receptor antibodies block the neuromuscular junction).
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#自身免疫 #免疫耐受 #分子模拟
朊病毒为何被视为不含核酸的感染性蛋白？
Why are prions considered infectious proteins lacking nucleic acid?
朊病毒是错误折叠的 PrP 蛋白，能把正常 PrP 诱导成同样构象并聚集，造成神经退行性疾病如疯牛病，其遗传信息完全由蛋白质构象传递。
Prions are misfolded PrP proteins that template normal PrP into the same conformation and aggregate, causing neurodegenerative disease like mad-cow disease, with infectivity carried entirely by protein conformation.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#朊病毒 #蛋白构象 #神经退行
抗体是怎么“抓住”病原体的？为什么得过一次天花就不会再得？
How do antibodies "grab" pathogens, and why does one bout of smallpox protect you for life?
抗体是 Y 字形的蛋白质，两臂顶端的可变区能精确匹配特定病原体表面的抗原表位，像钥匙配锁一样结合上去，从而中和病毒、标记细菌让吞噬细胞清除。感染过后，专一识别该病原体的记忆 B 细胞会长期存活，再次遇到时能快速增殖分化成大量抗体工厂。天花的病原体不会大变异，也没有动物宿主，所以一次感染或接种带来的终身免疫让人群再无新病例，世界卫生组织在1980年宣布天花被消灭。
Antibodies are Y-shaped proteins whose variable tips precisely match specific antigen epitopes on a pathogen, like a key in a lock, neutralizing viruses and tagging bacteria for phagocytes to destroy. After an infection, memory B cells that recognize that pathogen survive for years; upon re-exposure they rapidly multiply into antibody factories. Smallpox's virus barely mutates and has no animal reservoir, so lifelong immunity from one infection or vaccination left no new cases anywhere, and the WHO declared smallpox eradicated in 1980.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#抗体 #免疫记忆 #天花消灭
什么是水平基因转移？
What is horizontal gene transfer?
水平基因转移指生物把基因直接传给非后代的其他个体，常见于细菌之间。方式包括接合、转化和转导，能让有益基因（如抗药性）快速扩散。它在微生物进化和基因工程中都很重要。
Horizontal gene transfer is when an organism passes genes directly to another individual that is not its descendant, common among bacteria. Mechanisms include conjugation, transformation, and transduction and let useful genes like drug resistance spread fast. It matters in both microbial evolution and genetic engineering.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#水平基因转移 #细菌 #接合
群体感应如何让细菌协调群体行为？
How does quorum sensing let bacteria coordinate group behavior?
细菌分泌并感知小分子信号（自诱导物），当密度升高使信号浓度超过阈值时，全局调控基因被激活，协调生物发光、毒力和生物膜形成等集体行为。
Bacteria secrete and sense small autoinducer signals; once density raises signal above a threshold, global regulons switch on to coordinate collective behaviors like bioluminescence, virulence and biofilm formation.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#群体感应 #信号 #细菌
什么是抗生素，它为什么对病毒无效？
What are antibiotics, and why don't they work on viruses?
抗生素针对细菌的结构和代谢（如细胞壁合成），而病毒没有这些结构，靠劫持宿主细胞复制，所以抗生素无效。
Antibiotics target bacterial structures and metabolism like cell-wall synthesis; viruses lack these and hijack host cells, so antibiotics don't affect them.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#抗生素 #病毒 #细菌
生物膜为何使细菌更难被清除？
Why do biofilms make bacteria harder to eradicate?
细菌分泌胞外聚合物形成附着群落，内部细胞受物理屏障保护而降低药物渗透和免疫清除，并呈现代谢缓慢的持久态，导致慢性感染和耐药增强。
Bacteria embed in self-made extracellular polymeric matrices that limit drug penetration and immune clearance and harbor slow-metabolizing persister cells, driving chronic infection and heightened resistance.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#生物膜 #耐药 #慢性感染
抗生素为什么越来越不灵？“超级细菌”是怎么来的？
Why do antibiotics keep losing their power, and where do "superbugs" come from?
耐药性是自然选择加水平基因转移的结果。细菌繁殖快、突变不断，只要种群中有一个个体出现耐药突变，抗生素就会把它筛选出来：敏感菌被杀死，耐药菌繁殖扩散。更麻烦的是细菌之间通过质粒等可移动元件交换耐药基因，一种细菌学会的耐药性可以“批发”给其他菌种。滥用和用药不足（如给病毒感染开抗生素、自行停药）都加剧筛选。多重耐药的 MRSA 和碳青霉烯耐药肠杆菌就是典型的超级细菌，能对抗几乎全部常用抗生素。
Resistance is natural selection combined with horizontal gene transfer. Bacteria reproduce quickly and mutate constantly; if even one individual carries a resistance mutation, antibiotics select for it, as sensitive cells die while resistant ones multiply and spread. Worse, bacteria swap resistance genes through mobile elements like plasmids, so one species' resistance can be wholesale-copied to others. Both overuse and misuse, such as antibiotics for viral infections or stopping courses early, intensify the selection. Multidrug-resistant MRSA and carbapenem-resistant Enterobacteriaceae are classic superbugs that defy nearly every common antibiotic.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#耐药性 #超级细菌 #水平基因转移
噬菌体是什么，它如何感染细菌？
What are bacteriophages and how do they infect bacteria?
噬菌体是专门感染细菌的病毒，通常把遗传物质注入细菌、利用宿主复制自身，最终裂解细菌释放子代（裂解周期）。也有温和噬菌体把基因整合进宿主染色体随其复制（溶原周期）。噬菌体被研究用于抗菌疗法。
Bacteriophages are viruses that infect bacteria; they usually inject their genetic material, hijack the host to make copies, and lyse the cell to release progeny (lytic cycle). Some temperate phages integrate their genes into the host chromosome and replicate with it (lysogenic cycle). They are studied for antibacterial therapies.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《微生物学》
Brock Biology of Microorganisms
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787122008411（豆瓣书目条目: 微生物学）
#噬菌体 #裂解周期 #溶原周期 #病毒
什么是病毒的反转录？
What is reverse transcription in viruses?
反转录是某些病毒（如HIV）用自身RNA为模板，由反转录酶合成DNA的过程。这段DNA随后整合进宿主基因组，使病毒能长期潜伏。这也是艾滋病难以根治的原因之一。
Reverse transcription is when certain viruses, such as HIV, use their RNA as a template to make DNA via the enzyme reverse transcriptase. That DNA then integrates into the host genome, letting the virus hide for long periods. It is one reason AIDS is hard to cure.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#反转录 #HIV #病毒
细胞毒性T细胞是如何杀死被病毒感染的细胞的？
How do cytotoxic T cells kill virus-infected cells?
细胞毒性T细胞（CD8+ T细胞）通过T细胞受体识别靶细胞表面MHC I类分子呈递的病毒肽段后被激活，主要通过两种机制杀死靶细胞：一是释放穿孔素，在靶细胞膜上聚合打孔；二是释放颗粒酶（granzyme），经穿孔素孔进入靶细胞并激活caspase，诱导靶细胞凋亡。此外还可通过Fas配体与靶细胞Fas结合触发凋亡。杀死靶细胞后，CTL脱离并可继续攻击其他感染细胞。
Cytotoxic T cells (CD8+ T cells) are activated when their T-cell receptor recognizes viral peptides presented by MHC class I molecules on the target cell surface. They kill targets mainly by two mechanisms: releasing perforin, which polymerizes and forms pores in the target membrane, and releasing granzymes, which enter through the pores and activate caspases to induce apoptosis. They can also trigger apoptosis via Fas ligand binding to Fas on the target. After killing, the CTL detaches and can attack further infected cells.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#细胞毒性T细胞 #穿孔素 #颗粒酶
细菌怎样获得抗生素耐药性？
How do bacteria become antibiotic-resistant?
耐药可经自发突变或水平基因转移（质粒、转座子）获得，使细菌降解药物、外排药物或改变药物靶点；在用药选择下耐药株迅速占据优势。Walsh 的《抗生素》与 WHO 均强调这是全球公共卫生危机。
Resistance arises by spontaneous mutation or horizontal gene transfer (plasmids, transposons) that lets bacteria degrade, efflux or alter the drug target; under drug pressure resistant strains dominate. Walsh's 'Antibiotics' and the WHO stress this as a global public-health crisis.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Walsh《抗生素：作用、来源与耐药》；世界卫生组织（WHO）
Walsh, Antibiotics: Actions, Origins, Resistance; World Health Organization (WHO)
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 twitter-1415929996477095936：World Health Orga
#抗生素耐药 #质粒 #水平基因转移
为什么疫苗接种能提供长期的保护？
Why does vaccination provide long-lasting protection?
初次接触疫苗抗原后，一部分抗原特异性的B细胞和T细胞分化为长寿命记忆细胞，可存活数十年。再次接触同一病原体时，记忆B细胞快速增殖并分化为浆细胞，迅速产生大量高亲和力抗体（主要是IgG），抗体滴度远高于初次应答，达到保护水平更快；记忆T细胞也迅速扩增并清除感染细胞。疫苗正是通过无害化地诱导这种免疫记忆，让机体在真正感染前就已记住病原体。
After first exposure to vaccine antigens, some antigen-specific B and T cells differentiate into long-lived memory cells that can survive for decades. On re-exposure to the same pathogen, memory B cells rapidly proliferate and differentiate into plasma cells, quickly producing large amounts of high-affinity antibody (mainly IgG) with titers far above the primary response and a faster time to protective levels; memory T cells likewise expand swiftly to eliminate infected cells. Vaccines exploit this by safely inducing immunological memory so the body remembers the pathogen before a real infection occurs.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#免疫记忆 #记忆细胞 #疫苗
抗生素为什么对感冒无效？
Why are antibiotics useless against colds?
感冒多由病毒引起，而抗生素只针对细菌，对病毒不起作用。滥用抗生素还会杀死有益菌并催生耐药细菌。对付普通感冒通常靠休息和自身免疫力。
Colds are usually caused by viruses, while antibiotics target only bacteria and do nothing against viruses. Misusing antibiotics also kills helpful bacteria and breeds resistant strains. Ordinary colds are best handled with rest and the body's own immunity.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#抗生素 #病毒 #感冒
肠道里的益生菌对我们有什么实实在在的用处？
What real benefits do probiotics in our gut give us?
肠道里住着数以万亿计的微生物，它们把人体消化不了的膳食纤维分解成短链脂肪酸供肠细胞使用，还能合成维生素 K 和部分 B 族维生素。健康的菌群通过占据附着位点、分泌抗菌物质来压制有害菌，同时持续锻炼免疫系统，让免疫反应既灵敏又不乱攻击。菌群失衡与肥胖、炎症性肠病等疾病有关联，但益生菌产品的效果因人而异。
The gut hosts trillions of microbes that break down dietary fiber our bodies cannot digest into short-chain fatty acids that feed gut cells, and they synthesize vitamin K and some B vitamins. A healthy community keeps harmful bacteria in check by occupying attachment sites and secreting antimicrobial substances, while constantly training the immune system to be responsive without overreacting. Dysbiosis is linked to obesity and inflammatory bowel disease, though the benefits of commercial probiotics vary from person to person.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Nature（肠道菌群综述）
Nature (gut microbiome review)
#肠道菌群 #益生菌 #短链脂肪酸
古菌与细菌在细胞和分子层面有哪些关键区别？
What key cellular and molecular differences separate archaea from bacteria?
古菌细胞膜脂为醚键支链类异戊二烯、细胞壁无肽聚糖，其转录翻译系统更接近真核生物，常生活在极端环境，是与细菌并列的另一域。
Archaea have ether-linked branched isoprenoid membranes, lack peptidoglycan walls, and use transcription-translation machinery closer to eukaryotes; they often inhabit extreme environments and form a separate domain from bacteria.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#古菌 #细菌 #域
有些细菌在恶劣条件下为什么会形成"芽孢"？
Why do some bacteria form endospores under harsh conditions?
当营养耗尽时，芽孢杆菌、梭菌等会启动芽孢形成，把遗传物质浓缩进一层厚壁的抗性内孢子中。内孢子能耐受高温、干燥和辐射数十年甚至更久，待环境转好再萌发为活跃的营养细胞。
When nutrients run out, bacteria such as Bacillus and Clostridium undergo sporulation, packaging their DNA into a thick-walled, resistant endospore. Endospores survive heat, drying, and radiation for decades or longer, then germinate back into active cells when conditions improve.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Madigan 等，《Brock 微生物生物学》（第15版，Pearson，2018）
Madigan et al., Brock Biology of Microorganisms (15th ed., Pearson, 2018)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL3245844W：Brock biology of microo
#芽孢 #内孢子 #细菌抗性
病毒到底算不算“活的生物”？
Are viruses considered "living" organisms?
病毒缺少独立的代谢和能量系统，必须侵入宿主细胞才能复制，因此多数生物学家不将其归为完整的生命。但它们携带遗传物质并能演化，处于生命与非生命的边界。
Viruses lack independent metabolism and energy systems and must invade host cells to replicate, so most biologists do not classify them as fully living. Yet they carry genetic material and evolve, sitting on the boundary between life and non-life.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
美国微生物学会（ASM）「病毒学」教学专题；Madigan 等《Brock 微生物生物学》（Brock Biology of Microorganisms）
American Society for Microbiology (ASM), virology education; Madigan, M.T. et al., 'Brock Biology of Microorganisms'
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL3245844W：Brock biology of microo
#病毒 #生命定义 #寄生
为什么病毒会让人生病？
Why do viruses make us sick?
病毒入侵细胞复制自己，破坏细胞并触发免疫反应。
Viruses hijack cells to replicate, damaging them and sparking immunity.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#病毒 #免疫 #细胞
为什么食物放久了会发霉？
Why does food get moldy if left too long?
空气中的真菌孢子落到食物上，在温暖潮湿处萌发生长，形成可见的霉斑并分解食物。
Fungal spores in the air land on food and grow in warm, damp conditions, forming visible mold and breaking the food down.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#发霉 #真菌 #孢子
为什么医生总说普通感冒大多不用吃抗生素？
Why do doctors keep saying most common colds do not need antibiotics?
因为普通感冒绝大多数是病毒引起的，比如鼻病毒和冠状病毒，而抗生素只杀细菌。吃了抗生素既不能让感冒好得更快，还会白白筛选耐药菌、破坏肠道菌群。感冒要靠免疫系统自行恢复，一般一周左右自愈，治疗主要是多休息、喝水、对症退烧。只有在出现细菌性并发症（如化脓性扁桃体炎、中耳炎）时才需要抗生素。
Because most common colds are caused by viruses such as rhinoviruses and coronaviruses, while antibiotics only kill bacteria. Taking them does not speed up recovery, but does select for resistant bacteria and disturb the gut flora. Colds resolve on their own in about a week; care means rest, fluids and symptom relief such as fever reducers. Antibiotics are needed only when a bacterial complication appears, like purulent tonsillitis or otitis media.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#感冒 #病毒 #抗生素滥用
病毒为什么不算真正的细胞生物？
Why aren't viruses considered true cellular organisms?
病毒没有细胞结构，仅由蛋白质外壳包裹一段核酸（DNA 或 RNA）组成，自身不能代谢或繁殖，必须侵入宿主细胞借用其机器复制。因此病毒处于生命与非生命的边缘，常被归为「感染性颗粒」。
Viruses lack cellular structure, consisting only of a protein coat around a nucleic acid (DNA or RNA), and cannot metabolize or reproduce on their own, they must invade a host cell and hijack its machinery. Sitting at the edge of life and non-life, they are often called infectious particles.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#病毒 #核酸 #蛋白质外壳 #宿主
细菌和病毒到底有什么不一样？为什么抗生素对病毒没用？
What exactly is the difference between bacteria and viruses, and why do antibiotics fail against viruses?
细菌是有完整细胞结构的单细胞微生物，能独立生长繁殖，抗生素通过干扰细胞壁或蛋白质合成等途径杀灭或抑制它们。病毒比细菌小得多，只有蛋白质外壳和里面的核酸，没有细胞结构、没有自身代谢，必须钻进活细胞借用对方的机器才能繁殖。因为病毒不用细菌的细胞机器，所以抗生素无效，通常靠抗病毒药、疫苗和免疫系统对付。
Bacteria are single-celled organisms with a full cell structure that grow and reproduce on their own, so antibiotics kill or inhibit them by attacking things like cell-wall synthesis or protein production. Viruses are far smaller, just a protein coat around nucleic acid, with no cell structure and no metabolism of their own; they must invade a living cell and hijack its machinery to multiply. Since viruses do not use bacteria's machinery, antibiotics do not touch them; antivirals, vaccines and the immune system are the weapons instead.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#细菌 #病毒 #抗生素
发酵是什么过程？
What is fermentation?
发酵是微生物在缺氧条件下分解糖获取能量的过程，并产生酒精、乳酸等产物。酵母发酵产生面包和酒类，乳酸菌发酵则做出酸奶和泡菜。人类利用发酵已有上千年历史。
Fermentation is how microbes break down sugars for energy without oxygen, producing alcohol, lactic acid, and other products. Yeast fermentation gives us bread and alcohol, while lactic acid bacteria make yogurt and pickles. Humans have used fermentation for thousands of years.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#发酵 #酵母 #乳酸
肠道里的微生物如何影响大脑和情绪（"肠-脑轴"）？
How does the gut microbiome influence the brain and mood through the "gut–brain axis"?
肠-脑轴是肠道微生物群与中枢神经系统经迷走神经、免疫信号和代谢产物（如短链脂肪酸）双向沟通的网络。动物实验显示，改变肠道菌群可影响焦虑样行为和压力反应，提示微生物能调节情绪与认知。
The gut–brain axis is a two-way communication network between the gut microbiota and the central nervous system via the vagus nerve, immune signals, and microbial metabolites such as short-chain fatty acids. Animal studies show that altering the microbiome can shift anxiety-like behavior and stress responses, indicating microbes help regulate mood and cognition.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Cryan 与 Dinan，《改变心智的微生物》，《自然·神经科学评论》2012年
Cryan & Dinan, "Mind-altering microorganisms," Nature Reviews Neuroscience (2012)
#肠-脑轴 #微生物群 #神经行为 #短链脂肪酸
为什么说多数微生物对人有益？
Why are most microbes beneficial to us?
人体体表和肠道栖息着数以万亿计的微生物，它们帮助消化、合成维生素并训练免疫系统。环境中的微生物则分解枯枝落叶、参与物质循环。真正致病的微生物只是少数。
Trillions of microbes live on our skin and in our gut, helping digestion, making vitamins, and training the immune system. Environmental microbes decompose leaves and drive nutrient cycles. Only a small fraction of microbes actually cause disease.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#微生物 #有益 #肠道菌群
疱疹病毒如何在体内长期潜伏再复发？
How do herpesviruses remain latent and later reactivate?
疱疹病毒在初次感染后建立潜伏感染，病毒基因组以游离或整合形式静默存在于神经节细胞中，免疫下降或应激时再激活进入裂解复制并引起症状。
After primary infection herpesviruses establish latency with silent viral genomes in ganglia; upon immune decline or stress they reactivate into lytic replication and cause symptoms.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#疱疹病毒 #潜伏 #复发
病毒的包膜来自哪里，对感染有何作用？
Where does a viral envelope come from and what role does it play in infection?
包膜是病毒出芽时从宿主细胞膜获取的脂质双层并嵌有病毒糖蛋白，帮助病毒吸附并融合宿主细胞膜进入细胞，也使病毒对脂溶剂敏感。
The envelope is a host-derived lipid bilayer acquired during budding, studded with viral glycoproteins that mediate attachment and membrane fusion, while making the virus sensitive to lipid solvents.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#病毒包膜 #融合 #糖蛋白
细菌为什么会对抗生素产生抗药性？
Why do bacteria become resistant to antibiotics?
抗药性源于细菌中随机出现的耐药突变或获得耐药基因，在抗生素选择压力下，敏感菌被杀死而耐药菌存活繁殖，逐渐成为优势群体。滥用和未完成疗程会加速这一过程，使感染越来越难治。
Resistance arises from random resistant mutations or acquired resistance genes; under antibiotic pressure, susceptible bacteria die while resistant ones survive and multiply, becoming dominant. Overuse and unfinished courses accelerate this, making infections harder to treat.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#抗生素 #抗药性 #选择压力 #基因突变
I型超敏反应（过敏）的分子机制是怎样的？
What is the molecular mechanism of type I hypersensitivity (allergy)?
过敏原首次进入机体，诱导Th2细胞辅助B细胞产生针对该过敏原的IgE；IgE通过高亲和力受体FcεRI结合在肥大细胞和嗜碱性粒细胞表面，机体进入致敏状态。再次接触同一过敏原时，过敏原分子将相邻的IgE交联，导致肥大细胞脱颗粒，释放组胺、白三烯、前列腺素等介质，引起血管扩张、通透性增加、平滑肌收缩和黏液分泌，表现为荨麻疹、鼻炎、哮喘等，严重者可发生过敏性休克。抗组胺药通过阻断H1受体缓解症状。
On first exposure, an allergen induces Th2 cells to help B cells produce IgE specific for it; the IgE binds via the high-affinity receptor FcεRI to mast cells and basophils, leaving the body sensitized. On re-exposure, the allergen cross-links adjacent IgE molecules, triggering mast-cell degranulation and the release of histamine, leukotrienes, and prostaglandins, which cause vasodilation, increased permeability, smooth-muscle contraction, and mucus secretion, presenting as urticaria, rhinitis, and asthma, and in severe cases anaphylactic shock. Antihistamines relieve symptoms by blocking H1 receptors.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
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周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#过敏 #IgE #肥大细胞 #组胺
固有免疫系统是如何识别病原体并启动防御的？
How does the innate immune system recognize pathogens and launch defense?
固有免疫细胞（巨噬细胞、中性粒细胞、树突状细胞等）表面和胞内的模式识别受体（PRR），如Toll样受体（TLR）、NOD样受体（NLR），识别病原体共有的保守分子模式（PAMP），如革兰阴性菌的脂多糖、细菌肽聚糖、病毒双链RNA。识别后通过吞噬作用清除病原体，释放细胞因子和趋化因子引发炎症，并上调共刺激分子、加工抗原，为适应性免疫的启动做准备。固有免疫具有广谱、迅速但无记忆的特点，与皮肤黏膜屏障共同构成第一道防线。
Innate immune cells (macrophages, neutrophils, dendritic cells, etc.) express pattern recognition receptors (PRRs) such as Toll-like receptors (TLRs) and NOD-like receptors (NLRs) that detect conserved pathogen-associated molecular patterns (PAMPs), e.g., lipopolysaccharide of Gram-negative bacteria, bacterial peptidoglycan, and viral double-stranded RNA. Recognition triggers phagocytosis and killing, release of cytokines and chemokines that drive inflammation, and upregulation of co-stimulatory molecules plus antigen processing to prepare the adaptive response. Innate immunity is broad, fast, and lacks memory; together with the skin and mucosal barriers it forms the first line of defense.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03
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《细胞生物学》（固有免疫章节）
Cell Biology (Zhai Zhonghe, et al.), innate immunity
#固有免疫 #模式识别受体 #Toll样受体
益生菌对身体有什么好处？
How do probiotics help the body?
益生菌是肠道里的有益细菌，帮助消化、合成某些维生素并抑制有害菌生长。
Probiotics are helpful gut bacteria that aid digestion, make some vitamins, and suppress harmful microbes.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#益生菌 #肠道 #消化
发酵是什么过程，和呼吸有什么不同？
What is fermentation, and how does it differ from respiration?
发酵是细胞在无氧条件下分解有机物获取能量的方式，糖酵解产生的 NADH 通过把丙酮酸还原成乳酸或乙醇来再生 NAD+，但只产生少量 ATP。与有氧呼吸相比它不依赖氧气，产能效率也低得多。
Fermentation is how cells extract energy from organic compounds without oxygen: glycolysis yields NADH, which is recycled to NAD+ by reducing pyruvate to lactate or ethanol, producing only a little ATP. Unlike aerobic respiration, it needs no oxygen and is far less efficient.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
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《微生物学》
Brock Biology of Microorganisms
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787122008411（豆瓣书目条目: 微生物学）
#发酵 #无氧 #糖酵解 #乳酸
酵母菌是怎样发酵的？
How does yeast ferment?
酵母菌在无氧条件下把糖分解成酒精和二氧化碳，使面团膨胀、让酒产生气泡。
Yeast breaks sugar into alcohol and carbon dioxide without oxygen, making dough rise and giving drinks bubbles.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#酵母 #发酵 #二氧化碳
同一种细菌浮游状态下抗生素一击即溃,结成生物被膜后却能耐受数百倍浓度——耐药性并未伴随基因突变,那它究竟从何而来?
Planktonic cells of a given bacterium die quickly under an antibiotic, yet the same strain inside a biofilm tolerates hundreds-fold higher concentrations—without any accompanying mutation, where does this tolerance come from?
胞外多糖基质阻碍药物渗透,浅层细菌还会消耗或中和抗生素,深层细胞接触到的有效浓度大幅衰减。基质内同时形成氧气与营养梯度,深处细菌代谢趋于停滞,而多数抗生素只杀伤活跃分裂的细胞。此外膜内散布着休眠的持留菌,药物退去后迅速重启增殖,构成感染复发的种子。
The extracellular polysaccharide matrix impedes penetration, and cells in outer layers consume or neutralize the drug, so microbes deep inside receive a sharply attenuated dose. Gradients of oxygen and nutrients within the matrix push interior cells into near-dormancy, while most antibiotics kill only actively dividing bacteria. Dormant persisters scattered through the film then repopulate it once therapy stops, seeding relapse.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Costerton, Lewandowski, Caldwell & Korber,《MICROBIAL BIOFILMS》,Annual Review of Microbiology,1995 (DOI: 10.1146/annurev.mi.49.100195.003431)
Costerton, Lewandowski, Caldwell & Korber, 'MICROBIAL BIOFILMS', Annual Review of Microbiology, 1995, DOI: 10.1146/annurev.mi.49.100195.003431
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1146/annurev.mi.49.100195.003431
#生物被膜 #抗生素耐受
蓝细菌常被称为蓝绿藻，为什么分类上它们并不算真正的藻类？
Blue-green algae is a common nickname for cyanobacteria—why are they not true algae in classification?
真正的藻类是真核生物，细胞里拥有核膜包被的细胞核以及叶绿体、线粒体等膜性细胞器。蓝细菌却是原核生物：没有核膜与膜性细胞器，遗传物质呈环状DNA，以二分裂方式繁殖。超微结构和分子证据表明，真核藻类的叶绿体正源自远古蓝细菌的内共生事件。所以蓝细菌只是藻类叶绿体的祖先谱系，而不是藻类本身。
True algae are eukaryotes whose cells contain a nucleus bounded by a nuclear envelope, together with chloroplasts, mitochondria and other membrane-bound organelles. Cyanobacteria are prokaryotes: they have no nuclear envelope or organelles, carry circular DNA and multiply by binary fission. Ultrastructural and molecular evidence shows that the chloroplasts of eukaryotic algae descended from ancient cyanobacteria through endosymbiosis. Cyanobacteria are thus the ancestral lineage behind algal chloroplasts rather than algae themselves.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
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出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Lee R.E. 所著 Phycology 第5版，剑桥大学出版社，2018年
Lee, Phycology, 5th ed., Cambridge University Press, 2018
#原核生物 #内共生 #叶绿体起源 #细胞结构
硅藻的细胞壁为什么能长出如此精密的二氧化硅花纹？这种生物硅化过程是如何完成的？
Why do diatom cell walls display such intricate silica patterns, and how is the biosilicification process accomplished?
硅藻通过膜上的硅转运蛋白把水中的可溶性硅酸运入细胞，集中到专门的硅沉积囊泡。囊泡内由硅亲和肽与长链多胺组成的有机基质自组装成模板，引导无定形二氧化硅纳米球沉淀，按物种特有的图案组装出带精美孔纹的壳瓣。这种受基因调控的生物矿化使每种硅藻都拥有独一无二的“玻璃外壳”，既是分类学标志，也为仿生纳米材料提供了模板。
Diatoms import dissolved silicic acid through membrane silicon transporters and concentrate it in a dedicated silica-deposition vesicle. Inside, an organic matrix of silaffin peptides and long-chain polyamines self-assembles into templates that guide amorphous silica nanospheres to precipitate, building the perforated glass valve in a species-specific pattern. Because these templates are genetically controlled, every diatom species carries a unique shell—an identifier for taxonomists and a natural template for biomimetic nanomaterials.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Kröger N.、Deutzmann R.、Sumper M.《Polycationic peptides from diatom biosilica that direct silica nanosphere formation》,Science,1999年第286卷第1129-1132页
Kröger N., Deutzmann R. & Sumper M., "Polycationic peptides from diatom biosilica that direct silica nanosphere formation," Science 286:1129-1132 (1999)
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1126/science.286.5442.1129：Polycationic P
#硅藻 #生物硅化 #细胞壁
疫苗是怎么让我们不生病甚至不生大病的？
How do vaccines keep us from getting sick?
疫苗把灭活或减毒的病原体、或它的某个片段送进体内，让免疫系统“预演”一场没有真实伤害的遭遇。B 细胞被激活产生针对该病原体的抗体，还留下一批长寿的记忆细胞。以后真病原体入侵时，记忆细胞能迅速大规模增殖，在病毒站稳脚跟之前就把感染控制住，所以打过疫苗的人即使感染，症状也往往很轻或没有。
A vaccine delivers killed or weakened pathogens, or just a piece of them, so the immune system rehearses the encounter without real harm. B cells are activated to produce antibodies against that pathogen, and long-lived memory cells are left behind. When the real pathogen later invades, memory cells multiply rapidly and contain the infection before it gains a foothold, which is why vaccinated people usually have mild or no symptoms even if exposed.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#疫苗 #记忆细胞 #免疫
病毒的裂解周期和溶原周期有何不同？
How do the lytic and lysogenic cycles of a virus differ?
裂解周期中病毒立即复制并裂解宿主细胞释放新病毒；溶原周期中病毒基因组整合入宿主染色体随其复制而潜伏，遇到应激再进入裂解周期。
In the lytic cycle the virus replicates immediately and lyses the host to release progeny; in the lysogenic cycle the viral genome integrates into the host chromosome and replicates latently, later switching to lytic under stress.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#裂解 #溶原 #噬菌体
人体微生物组指的是什么？
What does the human microbiome refer to?
人体微生物组是寄居在皮肤、肠道、口腔等部位的全部微生物及其基因总和，数量可与人体细胞相当。它们参与营养代谢、免疫训练和抵御病原体，与肥胖、过敏等多种健康状况相关。
The human microbiome is the sum of all microbes and their genes living on the skin, gut, mouth, and elsewhere, numbering roughly as many as our own cells. They take part in nutrient metabolism, immune training, and pathogen defense, and are linked to conditions from obesity to allergies.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#微生物组 #肠道菌群 #免疫 #代谢
为什么有些食物要冷藏？
Why do some foods need refrigeration?
低温能减慢细菌和霉菌的生长繁殖，延缓食物腐败，延长保存时间。
Low temperatures slow the growth of bacteria and molds, delaying spoilage and extending shelf life.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#冷藏 #细菌 #保鲜
细菌是什么样的小生物？
What kind of tiny organisms are bacteria?
细菌是单细胞的原核生物，没有真正的细胞核，个体通常只有几微米大。它们形态多样（球状、杆状、螺旋状），广泛分布于土壤、水和生物体内，有的致病，但多数对人类有益或无害。
Bacteria are single-celled prokaryotes without a true nucleus, usually only a few micrometers across. They come in varied shapes, spherical, rod-like, spiral, and live everywhere in soil, water, and bodies; some cause disease, but most are harmless or helpful.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#细菌 #原核生物 #单细胞 #微生物
细菌是植物还是动物？
Are bacteria plants or animals?
细菌既不是植物也不是动物，它们属于独立的原核生物域。它们没有真正的细胞核，结构比动植物简单得多。细菌在土壤、水和人体内无处不在。
Bacteria are neither plants nor animals; they belong to the separate domain of prokaryotes. They lack a true nucleus and are far simpler than plants or animals. Bacteria are everywhere in soil, water, and even inside our bodies.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#细菌 #原核生物 #分类
微生物是什么？
What are microorganisms?
微生物是用肉眼看不见的微小生物，包括细菌、真菌和一些藻类，它们无处不在。
Microorganisms are tiny living things invisible to the naked eye, including bacteria, fungi, and some algae; they are everywhere.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#微生物 #细菌 #真菌
为什么用很多盐或糖腌渍能让食物不易坏？
Why do lots of salt or sugar keep food from spoiling?
高浓度的盐或糖会吸走微生物细胞里的水分（高渗透压），让细菌、霉菌难以生长和繁殖，所以咸肉、蜜饯能存放很久。这其实是靠"夺走水分"让有害微生物无法活动。
High concentrations of salt or sugar pull water out of microbial cells by osmosis, making it hard for bacteria and molds to grow, which is why cured meats and jams keep for a long time. It is essentially depriving spoilage microbes of the water they need.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Jay、Loessner 与 Golden，《现代食品微生物学》（第7版，Springer，2005）
Jay, Loessner & Golden, Modern Food Microbiology (7th ed., Springer, 2005)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL496742W：Modern food microbiology
#食物防腐 #渗透压 #腌制
微生物的发酵过程是什么？
What is the fermentation process in microorganisms?
发酵是微生物在缺氧条件下分解糖以获取能量的代谢方式，产物包括酒精、乳酸或二氧化碳等。人类利用酵母发酵制作面包和酒，利用乳酸菌制作酸奶和泡菜。
Fermentation is how microbes break down sugars for energy without oxygen, yielding alcohol, lactic acid, or carbon dioxide. Humans use yeast to make bread and alcohol, and lactic-acid bacteria for yogurt and kimchi.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
美国微生物学会（ASM）发酵与微生物代谢教学专题；Adams 与 Moss《食品微生物学》（Food Microbiology）
American Society for Microbiology (ASM), fermentation and microbial metabolism education; Adams, M.R. & Moss, M.O., 'Food Microbiology'
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL19600448W：Food microbiology（首版 2
#发酵 #酵母菌 #乳酸菌
做面包和酿酒时用的酵母是什么？
What is the yeast used in bread and alcohol?
酵母是一类小小的真菌，在面团或果汁里会吃掉糖分，释放二氧化碳让面包发起来、产生酒精做成酒。它虽然看不见，却帮我们做出松软的面包和好喝的饮料。
Yeast is a tiny kind of fungus that eats sugar in dough or juice and releases carbon dioxide, which makes bread rise, and produces alcohol for drinks. Invisible to the eye, it helps us make fluffy bread and tasty beverages.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《微生物学》
Brock Biology of Microorganisms
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787122008411（豆瓣书目条目: 微生物学）
#酵母 #真菌 #发酵 #二氧化碳
细菌产生抗生素抗性的主要机制是什么？
What are the main mechanisms by which bacteria develop antibiotic resistance?
细菌可通过突变或获得抗性基因，使药物靶点改变、产生降解酶、外排泵排出药物或减少药物摄入，从而在有药环境中存活并扩散抗性。
Via mutation or acquired resistance genes, bacteria alter drug targets, produce degrading enzymes, pump out drugs or reduce uptake, surviving and spreading resistance under antibiotic pressure.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#抗生素 #抗性 #细菌
细菌主要通过什么方式进行无性繁殖？
How do bacteria mainly reproduce asexually?
细菌通过二分裂将遗传物质复制后均等分配到两个子细胞，过程快速且无需配偶，是细菌主要的增殖方式。
Bacteria replicate by binary fission, duplicating their chromosome and splitting it equally into two daughter cells rapidly and without a mate, their main proliferation mode.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#二分裂 #细菌 #繁殖
取一滴池塘水放在显微镜下，里面可能住着多少个我们平时看不见的“小生命”？
A drop of pond water under the microscope—how many unseen “little lives” might live in it?
非常多！一滴水里可能有成千上万的微生物，如草履虫、眼虫、钟形虫和各种藻类，它们有的像拖鞋游动，有的长着鞭毛旋转，是肉眼看不见的小世界。
Very many! A single drop can hold thousands of microbes—paramecia, euglena, vorticella, algae—some gliding like slippers, others whirling with flagella. A tiny invisible world.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#池塘水 #微生物 #显微镜
噬菌体是病毒吗，它感染什么？
Are bacteriophages viruses, and what do they infect?
噬菌体是专门感染细菌的病毒，通过吸附细菌并注入遗传物质劫持其代谢来复制自身，可用于细菌分类和噬菌体疗法。
Bacteriophages are viruses that specifically infect bacteria, hijacking bacterial metabolism after attaching and injecting their genetic material, useful in bacterial typing and phage therapy.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#噬菌体 #病毒 #细菌
洗手为什么能赶走病菌？
Why does washing hands remove germs?
用肥皂和清水能把手上的细菌和病毒冲走并破坏它们的外膜，减少生病机会。
Soap and water wash away bacteria and viruses and break their outer layers, lowering the chance of getting sick.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
周德庆,《微生物学教程》第3版,高等教育出版社,2011
Zhou Deqing, Microbiology Tutorial, 3rd ed., Higher Education Press, 2011
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040314045（豆瓣书目条目: 微生物学教程）
#洗手 #肥皂 #卫生
我们嘴里到底住着多少种细菌，为什么天天刷牙也刷不干净所有？
How many bacterial species live in our mouths, and why doesn't daily brushing remove them all?
口腔是细菌“大社区”，可能有几百种、数以亿计，藏在牙缝、牙龈沟和舌苔里。刷牙能清掉大部分食物残渣和菌斑，但有些菌会形成生物膜牢牢粘在牙面，所以要配合牙线、漱口。
The mouth is a bacterial metropolis—hundreds of species, hundreds of millions—hiding in gaps, gum pockets and tongue coating. Brushing clears most plaque and food, but some form biofilms stuck to enamel, so floss and rinse too.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#口腔菌群 #牙菌斑 #生物膜