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Bacterial morphologies in carbonaceous meteorites and comet dust

机译:碳质陨石和彗星尘埃中的细菌形态

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摘要

Three decades ago the first convincing evidence of microbial fossils incarbonaceous chondrites was discovered and reported by Hans Dieter Pflug andhis collaborators. In addition to morphology, other data, notably laser massspectroscopy, confirmed the identification of such structures as putativebacterial fossils. Balloon-borne cryosampling of the stratosphere enablesrecovery of fragile cometary dust aggregates with their structure andcarbonaceous matter largely intact. Scanning electron microscope studies oftexture and morphology of particles in the Cardiff collection, together withEnergy Dispersive X-ray identifications, show two main types of putativebio-fossils - firstly organic-walled hollow spheres around 10 microns across,secondly siliceous diatom skeletons similar to those found in carbonaceouschondrites and terrestrial sedimentary rocks and termed "acritarchs". Sincecarbonaceous chondrites (particularly Type 1 chondrites) are thought to beextinct comets the data reviewed in this article provide strong support fortheories of cometary panspermia.
机译:三十年前,汉斯·迪特·普弗格(Hans Dieter Pflug)及其合作者发现并报道了碳质球粒陨石中微生物化石的第一个令人信服的证据。除形态学外,其他数据(尤其是激光质谱法)也证实了这种结构如推定细菌化石的鉴定。平流层的球囊式低温成象技术能够回收脆弱的彗星尘埃聚集体,其结构和碳质物质基本完好无损。扫描电子显微镜对加的夫收集物中颗粒的结构和形态的研究,以及能量色散X射线鉴定,显示出两种主要类型的假定生物化石-首先是直径约10微米的有机壁空心球,其次是类似于发现的硅质硅藻骨架在碳质角砾岩和陆地沉积岩石中被称为“尖顶”。由于碳质球粒陨石(尤其是1型球粒陨石)被认为是绝迹彗星,因此本文中所综述的数据为彗星紫杉理论提供了有力的支持。

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