Rivadeneyra M A, Delgado G, Ramos-Cormenzana A, Delgado R
Department of Microbiology, Faculty of Pharmacy, University of Granada, Spain.
Res Microbiol. 1998 Apr;149(4):277-87. doi: 10.1016/s0923-2508(98)80303-3.
Carbonate precipitation by 20 strains of the moderately halophilic species Halomonas eurihalina in both solid and liquid media was studied. The influence of salinity and temperature on the quantity and type of crystals precipitated was also investigated. Some strains of H. eurihalina formed crystals in all conditions tested. The mineral phases precipitated were magnesium calcite, aragonite and monohydrocalcite in variable proportions depending on various factors such as the type of growth medium employed and its salinity. Scanning electron microscopy and X-ray dispersive energy microanalysis were used to investigate the crystal formation sequence. The process of biolith formation was sequential. It started with chains or filaments of bacteria, giving way to discs which finally produced spherical forms of approximately 50 microns in diameter. We suggest a mechanism of carbonate crystal formation by H. eurihalina.
研究了20株中度嗜盐物种嗜盐嗜碱单胞菌在固体和液体培养基中碳酸盐沉淀的情况。还研究了盐度和温度对沉淀晶体数量和类型的影响。一些嗜盐嗜碱单胞菌菌株在所有测试条件下都形成了晶体。沉淀的矿物相为镁方解石、文石和一水方解石，其比例各不相同，这取决于多种因素，如所用生长培养基的类型及其盐度。利用扫描电子显微镜和X射线色散能谱微分析来研究晶体形成顺序。生物岩形成过程是循序渐进的。它始于细菌链或丝，进而发展为圆盘状，最终产生直径约50微米的球形。我们提出了嗜盐嗜碱单胞菌形成碳酸盐晶体的机制。
