File:Giardia_muris_trophozoite_SEM_11643.jpg
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原始文件 (1,496 × 1,039像素,文件大小:843 KB,MIME类型:image/jpeg)
描述Giardia muris trophozoite SEM 11643.jpg |
English: This scanning electron micrograph (SEM) clearly showed the ventral surface of a Giardia muris trophozoite. The ventral adhesive disk resembles a suction cup, where overlapping microtubules in the cytoplasm form a number-6-shaped figure. Giardia muris has four pairs of flagella that are responsible for the organism’s motility. The adhesive disk facilitates adherence of the protozoan to the intestinal surface.
The protozoan Giardia causes the diarrheal disease called giardiasis. Giardia species exist as free-swimming (by means of flagella) trophozoites, and as egg-shaped cysts. It is the cystic stage, which facilitates the survival of these organisms under harsh environmental conditions. The cyst is considered the infective form, and disease is often transmitted by drinking contaminated water. As depicted in these SEMs, in the intestine, cysts are stimulated to liberate trophozoites. Cysts can be shed in fecal material, and can, thereafter, remain viable for several months in appropriate environmental conditions. Cysts can also be transferred directly from person-to-person, as a result of poor hygiene. |
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作者 | CDC/ Dr. Stan Erlandsen | ||||
授权 (二次使用本文件) |
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当前 | 2009年11月2日 (一) 07:43 | 1,496 × 1,039(843 KB) | Raeky | {{Information |Description={{en|1=This scanning electron micrograph (SEM) clearly showed the ventral surface of a Giardia muris trophozoite. The ventral adhesive disk resembles a suction cup, where overlapping microtubules in the cytoplasm form a number-6 |
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作者 | Photographer:Dr. Stan Erlandsen |
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著作权所有人 | http://www.cdc.gov/HealthySwimming/giardiafacts.htm
CDC - Nat. Center for Zoonotic, Vector-borne, and Enteric Disease; Giardiasis: Fact Sheet CDC - Div. of Parasitic Diseases (DPDx); Giardiaisis |
宽度 | 1,496 px |
高度 | 1,039 px |
每部件位数 | 8 |
压缩方案 | LZW |
像素构成 | 主色调 |
方位 | 标准 |
像素数 | 1 |
水平分辨率 | 300 dpi |
垂直分辨率 | 300 dpi |
使用软件 | Adobe Photoshop CS4 Windows |
文件修改日期时间 | 2009年11月2日 (一) 02:37 |
色彩空间 | 无标定 |