Long-time fermentation has always been one of the reasons restricting the development of straw biological pulping.This study aimed to develop a novel straw pulp film with shortened solid-state fermentation time with l...Long-time fermentation has always been one of the reasons restricting the development of straw biological pulping.This study aimed to develop a novel straw pulp film with shortened solid-state fermentation time with less than 20%mass loss rate by bio-pulping synergistic treatment of straw fibers with deep eutectic solvent(DES)and Streptomyces rochei(S.rochei).Results illustrated that at 3%S.rochei concentration with 7-day fermentation,both cellulose and hemicellulose enzyme activities of the treated rice straw fiber reached peak values with a fiber mass loss rate of 17.01%.Microstructural morphology revealed that S.rochei colonization initiated on straw surfaces and progressively penetrated internal structures,resulting in surface loosening and distinct disruption of cell wall tissues within vascular bundles in transverse sections.The treated rice straw strip indicated a maximum tensile strength of 46.22 MPa for(Bacteria)BA 3%at day 7,attributed to optimized synergistic effects of microfibril angle(MFA)and cellulose/hemicellulose relative content ratio.The modified straw pulp film exhibited significant enhancement in the tensile index(44.9%increase),burst index(10.3%increase),and tear index(60%increase)compared to untreated groups.This work demonstrated the important role ofDES and S.rochei bio-pulping synergistic treatment in improving rice straw pulp performance,suggesting an eco-friendly,novel,and efficient biomass pretreatment technology for potential application prospects in sustainable agricultural mulching materials.展开更多
目的:比较Bio-dentine、iRoot BP Plus、TheraCal■LC和氢氧化钙直接盖髓对龋源性露髓恒牙的临床疗效。方法:选择2022年4月1日至2023年4月1日康复大学青岛医院(青岛市市立医院)口腔科治疗的龋源性露髓恒牙360颗。随机分为A组(Bio-dentin...目的:比较Bio-dentine、iRoot BP Plus、TheraCal■LC和氢氧化钙直接盖髓对龋源性露髓恒牙的临床疗效。方法:选择2022年4月1日至2023年4月1日康复大学青岛医院(青岛市市立医院)口腔科治疗的龋源性露髓恒牙360颗。随机分为A组(Bio-dentine组)、B组(iRoot BP Plus组)、C组(TheraCal■LC组)和D组(氢氧化钙组),每组90颗。比较4组盖髓时长。治疗后第1、3、6、12个月测量并计算成功率以及牙本质桥的厚度和密度。结果:在盖髓时长方面,C组小于A、B组,A、B组小于D组(P<0.05)。在成功率方面,第1个月,4组成功率差异无统计学意义(P>0.05);第3个月,A组高于C组(P<0.05);第6、12个月,A、B两组高于C、D组(P<0.05)。在牙本质桥厚度方面,第1个月,A组高于B组,B组高于C组,C组高于D组(P<0.05);第3、6、12个月,A、B两组高于C、D组(P<0.05)。在牙本质桥密度方面,第1、3、6、12个月,A、B组高于C组,C组高于D组(P<0.05)。结论:对于龋源性露髓恒牙,Bio-dentine与iRoot BP Plus疗效相当,且均优于TheraCal~?LC和氢氧化钙。展开更多
基金funded by the Agricultural Science and Technology Innovation Fund of Jiangsu Province[Grant/Award Number:CX(24)1008]Key Research and Development Program Project of Henan Province(251111110100)National State Science Foundation of China[Grant/Award Number:21808093].
文摘Long-time fermentation has always been one of the reasons restricting the development of straw biological pulping.This study aimed to develop a novel straw pulp film with shortened solid-state fermentation time with less than 20%mass loss rate by bio-pulping synergistic treatment of straw fibers with deep eutectic solvent(DES)and Streptomyces rochei(S.rochei).Results illustrated that at 3%S.rochei concentration with 7-day fermentation,both cellulose and hemicellulose enzyme activities of the treated rice straw fiber reached peak values with a fiber mass loss rate of 17.01%.Microstructural morphology revealed that S.rochei colonization initiated on straw surfaces and progressively penetrated internal structures,resulting in surface loosening and distinct disruption of cell wall tissues within vascular bundles in transverse sections.The treated rice straw strip indicated a maximum tensile strength of 46.22 MPa for(Bacteria)BA 3%at day 7,attributed to optimized synergistic effects of microfibril angle(MFA)and cellulose/hemicellulose relative content ratio.The modified straw pulp film exhibited significant enhancement in the tensile index(44.9%increase),burst index(10.3%increase),and tear index(60%increase)compared to untreated groups.This work demonstrated the important role ofDES and S.rochei bio-pulping synergistic treatment in improving rice straw pulp performance,suggesting an eco-friendly,novel,and efficient biomass pretreatment technology for potential application prospects in sustainable agricultural mulching materials.
文摘目的:比较Bio-dentine、iRoot BP Plus、TheraCal■LC和氢氧化钙直接盖髓对龋源性露髓恒牙的临床疗效。方法:选择2022年4月1日至2023年4月1日康复大学青岛医院(青岛市市立医院)口腔科治疗的龋源性露髓恒牙360颗。随机分为A组(Bio-dentine组)、B组(iRoot BP Plus组)、C组(TheraCal■LC组)和D组(氢氧化钙组),每组90颗。比较4组盖髓时长。治疗后第1、3、6、12个月测量并计算成功率以及牙本质桥的厚度和密度。结果:在盖髓时长方面,C组小于A、B组,A、B组小于D组(P<0.05)。在成功率方面,第1个月,4组成功率差异无统计学意义(P>0.05);第3个月,A组高于C组(P<0.05);第6、12个月,A、B两组高于C、D组(P<0.05)。在牙本质桥厚度方面,第1个月,A组高于B组,B组高于C组,C组高于D组(P<0.05);第3、6、12个月,A、B两组高于C、D组(P<0.05)。在牙本质桥密度方面,第1、3、6、12个月,A、B组高于C组,C组高于D组(P<0.05)。结论:对于龋源性露髓恒牙,Bio-dentine与iRoot BP Plus疗效相当,且均优于TheraCal~?LC和氢氧化钙。
