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J4 ›› 2015, Vol. 21 ›› Issue (4): 603-.

• 矿物科学与工程专栏(二) • 上一篇    下一篇

细菌作用下球状碳酸盐矿物形成的新途径: 以柠檬酸杆菌GW-M菌株为例

郭文文,李福春*,马 恒,徐青龙   

  • 出版日期:2015-12-20 发布日期:2016-01-04

TheNewFormationWaysofSphericalCarbonateMinerals InducedbyBacteria:ExampleofCitrobactersp.StrainGW-M

GUO Wenwen, LI Fuchun*, MA Heng, XU Qinglong   

  • Online:2015-12-20 Published:2016-01-04

摘要:

为了探讨细菌作用下碳酸盐矿物的形成机理,本文对分离自土壤的一株柠檬酸杆菌GW-M菌株进行了为期165d的培养 实验。利用X-射线衍射技术对沉淀物的矿物成分进行了测定,利用扫描电子显微镜对沉淀物的形态进行了系统的观察。结果 表明,GW-M菌株诱导形成的碳酸盐矿物(方解石和单水碳钙石)具有多种形态共存并以球状为主的特点,而无菌对照实验产 物中的矿物形态则比较单一。在GW-M菌株的作用下,通过以下三条途径均可能形成球状矿物:(1)单个哑铃→两端生长→ 球;(2)两个交叉的哑铃→两个哑铃的两端各自生长→球;(3)三个交叉的哑铃→三个哑铃的两端各自生长→球。

关键词: 柠檬酸杆菌;碳酸盐矿物;哑铃形;球状

Abstract:

 Inordertounderstandtheformationmechanismofcarbonatemineralsinducedbymicrobes,cultureexperimentswitha durationof165dayswereperformedunderthemediationofstrainGW-Misolatedfromsoil.MineralspeciesweredeterminedbyX-ray diffraction,andthemorphologiesofprecipitatedcarbonateswereobservedusingscanningelectronmicroscopy.Theresultsshowedthat the carbonate minerals (calcite and monohydrocalcite) induced by strain GW-M featured various morphologies, mainly spherical morphology.Incontrast,morphologiesofcarbonatemineralsformedintheasepticexperimentswererelativelysimple.Threeways mightleadtotheformationofsphericalmineralsundertheactionofstrainGW-M.(1)Thefirstwaywassingledumbbell-shaped mineralswithfinecrystalsgatheredfasteronbothendsthanthemiddlepartofthedumbbell,changingdumbbell-shapedmineralsinto sphericalones.(2)Thesecondwaywastwocrosseddumbbell-shapedmineralswithfinecrystalsgatheredfasteronbothendsthanthe middlepartofthetwodumbbells,resultinginsphericalminerals.(3)Thefinalwaywasthreecrosseddumbbell-shapedmineralswith finecrystalsgatheredfasteronbothendsthanthemiddlepartofthethreedumbbells,eventuallyevolvingintosphericalminerals.

Key words: Citrobactersp.;carbonateminerals;dumbbell-likemorphology;sphericalmorphology