Taha Tarek H, Elnouby Mohamed S, Abu-Saied M A, Alamri Saad
Environmental Biotechnology Department, Genetic Engineering and Biotechnology Research Institute (GEBRI), City of Scientific Research and Technological Applications (SRTA-City) New Borg El-Arab City 21934 Alexandria Egypt.
Composite and Nanostructured Materials Research Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City) New Borg El-Arab City 21934 Alexandria Egypt.
RSC Adv. 2020 Jun 15;10(36):21350-21359. doi: 10.1039/d0ra01734e. eCollection 2020 Jun 2.
The future expected water scarcity in the world invites the scientists to figure out sustainable solutions for agriculture needs. One of suggested solutions could be the improvement of soil stability and increasing its water retention ability. The current proposal is concerning by the improvement of soil stability through biocementation process. While, water retention ability was enhanced through the amendment of tested soils with alginate hydrogel. An ureolytic bacterial isolate showed a detectable ability to dissociate urea and act as a nucleation site for calcium carbonate precipitation. The bacterium was identified as sp. after comparing with other strains in GenBank. The mechanical properties of three tested soil types (sand, calcareous, and clay) were improved after the biocementation by calcium carbonate from 119.8, 45.9, and 5 (N) to 187.5, 423.9, and 337.2, respectively. The Energy-dispersive X-ray spectroscopy (EDX) analysis confirmed the appearance of carbon element in samples containing bacterial-immobilized beads and free bacterial cells indicating calcium carbonate formation. The water uptake measurements investigated the ability of alginate beads to retain water with a percentage of 55%. The overall results prove the capability of sp. strain combined with alginate hydrogel to improve the soil stability and water retention ability.
未来世界预期的水资源短缺促使科学家们找出满足农业需求的可持续解决方案。其中一个建议的解决方案可能是提高土壤稳定性并增强其保水能力。当前的提议涉及通过生物胶结过程改善土壤稳定性。同时，通过用藻酸盐水凝胶改良受试土壤来提高保水能力。一种尿素分解细菌分离物显示出分解尿素的可检测能力，并作为碳酸钙沉淀的成核位点。与GenBank中的其他菌株比较后，该细菌被鉴定为 种。三种受试土壤类型（沙子、钙质土和黏土）在通过碳酸钙进行生物胶结后，力学性能分别从119.8、45.9和5（牛顿）提高到187.5、423.9和337.2。能量色散X射线光谱（EDX）分析证实，在含有固定化细菌的珠子和游离细菌细胞的样品中出现了碳元素，表明形成了碳酸钙。吸水率测量研究了藻酸盐珠子的保水能力，保水率为55%。总体结果证明了 种菌株与藻酸盐水凝胶结合能够提高土壤稳定性和保水能力。
