Nostoc和Anabaena之间的差异

Key Difference – Nostocvs Anabaena

Cyanobacteriaor blue-green algae are important organisms in生态系统。这y are capable ofphotosynthesizingand producing their own foods. As a byproduct of photosynthesis, oxygen gas releases to the atmosphere. It is believed, cyanobacteria are the first organisms that contributed to creating an oxygenic atmosphere at the beginning of the life on Earth. There are different genera of cyanobacteria. Among them, Nostoc and Anabaena are two genera. Nostoc is a type of cyanobacteria that composes gelatinous colonies formed from filamentous cells. Anabaena is another type of filamentous, bead-like cyanobacterium that exists asplanktons。这key differencebetween nostoc and Anabaena is thatNostoc的营养细胞被粘液鞘覆盖，而Anabaena的细胞不覆盖粘液鞘。

内容

1.Overview and Key Difference
2.什么是Nostoc
3.What is Anabaena
4.Similarities Between Nostoc and Anabaena
5.Side by Side Comparison – Nostoc vs Anabaena in Tabular Form
6.概括

什么是Nostoc？

Nostoc是蓝绿色藻类或蓝细菌。Nostoc细胞在珠状链中排列，并形成被粘液鞘覆盖的菌落。Nostoc经常在静水栖息地中发现。还可以在土壤中找到Nostoc。Nostoc有两种色素，可为Nostoc提供特征性的蓝绿色。它们是蓝色的植物素和红色卵黄油。除了这两种颜料外，Nostoc具有叶绿素捕获阳光和光合作用的颜料。Nostoc具有固定大气的能力氮。Nostoc拥有的称为杂环的结构促进了这种能力。

NOSTOC的繁殖通常是通过碎片发生的。NOSTOC具有特殊的休眠结构或细胞，可承受恶劣的环境条件。他们被称为Akinetes。Akinetes是具有抵抗干燥的能力的厚壁细胞。Nostoc是亚洲的良好补充食品来源。

什么是Anabaena？

Anabaena is a cyanobacterium that is composed of beadlike or barrellike cells formed into colonies. It is a filamentous cyanobacterium that normally exists as plankton. It has uniform trichomes. Anabaena cells are not covered with a mucilaginous sheath. The vegetative cells or trichomes of Anabaena are arranged in chains, and they are not branched.

它在symbiotic relationships with certain plants。One common water fern isAzolla。这association of Anabaena with plants provides plants nitrogen while plants supply carbon for Anabaena. Therefore, most of the rice farmers useAzollafern which has Anabaena as anorganic fertilizer向水稻植物提供氮。Anabaena具有固定大气氮的能力。氮固定是由称为Anabaena的杂环的专门细胞进行的。出于上述目的，杂环从营养细胞发展。Anabaena是一种光自营养的蓝细菌。它执行氧合光合作用并生产自己的食物。在光合作用期间，它将氧气释放到大气中。

Anabaena can be found in fresh water, and it is considered as a contaminant of drinking water since it gives fishy odour and taste. Anabaena is popular as a producer of neurotoxins, which is a harmful product for wildlife. Similar to Nostoc, Anabaena is also reproduce by fragmentation. And also it possesses akinetes to withstand harsh environmental conditions.

What are the Similarities Between Nostoc and Anabaena?

• Nostoc和Anabaena是原核生物。因此他们没有真实nucleus。
• Nostoc and Anabaena are two bacterial species.
• Both Nostoc and Anabaena are filamentous, and they possess unbranched trichomes.
• Both Nostoc and Anabaena are cyanobacteria or blue, green algae.
• Both Nostoc and Anabaena can fix atmospheric nitrogen.
• Both Nostoc and Anabaena can do photosynthesis.
• Nostoc和Anabaena都有异囊。
• Both Nostoc and Anabaena are found in moist environments.
• Nostoc and Anabaena belong to the same order and family.
• Nostoc和Anabaena都使用碎片作为繁殖方法。
• Both Nostoc and Anabaena possess akinetes for the tolerance of harsh environmental conditions.

Nostoc和Anabaena有什么区别？

Nostoc vs Anabaena
Nostoc is a gelatinous form of cyanobacterium, which is filamentous.	Anabaena是一种珠状丝状蓝细菌，通常以浮游生物为单位。
Presence of Mucilaginous Sheath
Nostoc has a mucilaginous sheath.	Anabaena does not have a mucilaginous sheath.

摘要 - Nostocvs Anabaena

Anabaena and Nostoc are two cyanobacteria that can photosynthesize and fix nitrogen. Both are able to make symbiotic relationships with certain plants. Both possess heterocysts and akinetes. Both forms are filamentous and havevegetative cellsthat are beadlike. Both cyanobacteria cells are arranged in chains. Both possess chlorophyll a and phycocyanins. Both nostoc and Anabaena reproduce by fragmentation. The difference between nostoc and Anabaena is that Nostoc has a mucilaginous sheath covering its vegetative cells while it is absence is Anabaena.

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Reference:

1.的编辑Encyclopædia大英百科全书。“念珠藻属。” Encyclopædia Britannica, Encyclopædia Britannica, inc., 2 Nov. 2016.Available here
2.“Anabaena.” Anabaena – microbewiki,Available here

Image Courtesy:

1.’nostoc cuncume’y yamamaya - 自己的工作，(CC BY-SA 3.0)viaCommons Wikimedia
2.’Anabaena sperica2′(CC BY-SA 3.0)viaCommons Wikimedia