Ultrastructure of bacteria and the proportion of Gram-negative bacteria in marine sediments
Ultrastructure of bacteria and the proportion of Gram-negative bacteria in marine sediments
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DOI：
10.1007/bf02011456
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发表时间：
1982-06
影响因子：
3.6
通讯作者：
David J.W. Moriarty;A. Hayward
中科院分区：
文献类型：
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作者：
David J.W. Moriarty;A. Hayward
对海草床表层好氧层(0~1 cm)和深层厌氧层(20~21 cm)沉积物中的细菌进行了切片观察。革兰氏阴性菌占表层细菌总数的90%，革兰氏阳性菌占10%。在厌氧区，革兰氏阴性菌占细菌总数的70%，革兰氏阳性菌占细菌总数的30%。这些差异是非常显著的，并支持从壁壁酸测量和荧光显微镜直接计数得出的这些比例的预测。大多数细胞被包裹在细胞外的粘液层或包膜中，其中一些具有相当复杂的结构。讨论了这些信封对动物的营养价值。观察到了一种独特的带刺生物。
Bacteria in sediments from the surface aerobic layer (0–1 cm) and a deeper anaerobic layer (20–21 cm) of a seagrass bed were examined in section by transmission electron microscopy. Bacteria with a Gram-negative ultrastructure made up 90% of bacteria in the surface layer, and Gram-positive bacteria comprised 10%. In the anaerobic zone, Gram-negative bacteria comprised 70% and Gram-positive bacteria 30% of the bacterial population. These differences were highly significant and support predictions of these proportions made from muramic acid measurements and direct counting with fluorescence microscopy. Most cells were enveloped in extracellular slime layers or envelopes, some with considerable structural complexity. The trophic value to animals of these envelopes is discussed. A unique organism with spines was observed.