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| 1 | Regulation of DNA double-strand break repair pathway choice显示文摘脱氧核糖核酸双海滨裂缝(DSB ) 是能包括大规模或小规模的删除,杂合现象的损失, translocations,和染色体损失导致房间死亡或许多基因改变的批评损害。DSB 被修理由非相应加入结束(NHEJ ) 并且相应再结合(HR ) ,和在这些小径的缺点引起染色体不稳定性并且支持 tumorigenesis。DSB 包括直接或间接地损坏脱氧核糖核酸并且通常在癌症治疗被使用的离子辐射和化学药品包括在细胞的新陈代谢,折叠复制叉,和核酸酶期间产生的反应的氧种类从内长的来源,并且从外长的来源产生。DSB 修理小径看起来竞争因为在他们之间的 DSB,而是平衡在种之中广泛地不同,在单个种的不同细胞类型之间,并且在一个单身者的不同细胞周期阶段期间,细胞打字。这里,我们考察在酵母和更高的优核质由 NHEJ 和 HR 调整 DSB 修理的规章的因素。这些因素包括修理蛋白质,修理因素可接近性的染色质调整,和相应修理模板的可获得性的调整表示和磷酸化。当大多数 DSB 修理蛋白质看起来专门在 NHEJ 或 HR 工作时,很多蛋白质影响两条小径,包括 MRE11/RAD50/NBS1 (XRS2 ) 建筑群, BRCA1,嘘一 H2AX, PARP-1, RAD18, DNA 依赖的蛋白激酶催化子单元(DNA-PKcs ) ,和 ATM。DNA-PKcs 在哺乳动物的 NHEJ 起一个作用,但是它也通过可以与涉及是由 DNA-PKcs 的 phosphorylated 的 HR 的至少 12 蛋白质的 ATM 或 ATM 包含串音的一个复杂规章的网络影响 HR。 | Meena Shrivastav Leyma P De Haro Jac A Nickoloff | 2008 | Cell Research2008，18，1： | 67 |
| 2 | Dynamic hip screw with locking side plate: a viable treatment option for intertrochanteric fracture显示文摘ObjectiveDynamic 新潮的螺丝钉(DHS ) 为稳定的 intertrochanteric 破裂的固定被推荐。它的手术后的开口率从 1% ~ 6%。在 osteoporotic 骨头,在 DHS 片的正常螺丝钉与锁螺丝钉相比提供更少的抛锚。这研究试图把 DHS 与锁方面板和常规方面 plate.MethodsFifty 作比较有 intertrochanteric 破裂的连续病人随机与标准 DHS (组 A ) 和锁住的 DHS 为固定被分配(Combi 板,组 B ) 。我们在 intertrochanteric 破裂为常规 DHS 和锁住的 DHS 比较了临床、放射学的结果。功能的结果用 score.ResultsCoxa valga 比在组 B 在组 A 更经常被发现的帕克活动性被评估(12% 对 0% , P = 0.42 ) 。臀部 vara 显示出一样的趋势(12% 对 8% , P = 0.81 ) 。在健全方面的 20 °
以内的手术后的颈柄角度的恢复的率比在组 A 在组 B (8% 盒子) 是更高的(4% 盒子, P = 0.98 ) 。在健全方面的 10 °
以内的子宫前倾角度恢复的率在组 B 也是更高的(100% 对 88% , s = 0.85 ) 。一般水准落后在组 A 和组 B 的螺丝钉滑动是 3.2 公里和 4.2 公里,平均破裂联合持续时间是 17.1 个星期, 16.4 个星期,和吝啬的帕克得分分别地是 5.6 和 5.8。螺丝钉开口在组 A 在一个病人被看见。没有开口在组 B 在任何病人被看见。没有耐心的发达深感染, avascular 坏死,深静脉血栓或任何东西学习表明了的在场的另外的重要 complications.ConclusionThe 有锁住的 DHS 的那对待的 intertrochanteric 破裂允许健全骨头愈合并且是没与任何主要复杂并发症联系。尽管这份报告是有希望的,因为仅仅有一种大样品尺寸的未来的研究将允许权威的结论,它应该小心地被解释。 | Nilesh Barwar Sanjay Meena Shashi Kant Aggarwal Prashant Garhwal | 2014 | Chinese Journal of Traumatology2014，17，2： | 23 |
| 3 | Application of response surface methodology(RSM) for optimization of leaching parameters for ash reduction from low-grade coal显示文摘Coal is the world's most abundant energy source because of its abundance and relatively low cost. Due to the scarcity in the supply of high-grade coal, it is necessary to use low-grade coal for fulfilling energy demands of modern civilization. However, due to its high ash and moisture content, low-grade coal exerts the substantial impact on their consumption like pyrolysis, liquefaction, gasification and combustion process. The present research aimed to develop the efficient technique for the production of clean coal by optimizing the operating parameters with the help of response surface methodology. The effect of three independent variables such as hydrofluoric acid(HF) concentration(10–20% by volume), temperature(60–100 °C), and time(90–180 min), for ash reduction from the low-grade coal was investigated. A quadratic model was proposed to correlate the independent variables for maximum ash reduction at the optimum process condition by using central composite design(CCD) method. The study reveals that HF concentration was the most effective parameter for ash reduction in comparison with time and temperature. It may be due to the higher F-statistics value for HF concentration, which effects to large extent of ash reduction. The characterization of coal was evaluated by Fourier transform infrared spectroscopy(FTIR) analysis and Field-emission scanning electron microscopy with energy-dispersive X-ray(FESEMEDX) analysis for confirmation of the ash reduction. | Sushanta Kumar Behera Himanshu Meena Sudipto Chakraborty B.C.Meikap | 2018 | International Journal of Mining Science and Technology2018，28，4： | 9 |
| 4 | HOS3, an ELO-Like Gene, Inhibits Effects of ABA and Implicates a S-1-P/Ceramide Control System for Abiotic Stress Responses in Arabidopsis thaliana显示文摘Arabidopsis thaliana 的 hyper-osmotically 敏感的异种,指明的 hos3-1 (渗透地应答的基因的高表示) ,基于它 RD29A 的超被识别: 在有 NaCl 和骆驼毛的织物的处理之上的 LUC 倡导者熔化植物。这些回答含有破坏基因作为 RD29A 压力应答的小径的一个直接或间接的否定管理者。由定序 T-DNA 边阶的 flanking 区域,破坏基因在地点 At4g36830,这被决定,作为与高相同编码通常认为的蛋白质到 CIG30 (ELO2/FEN1 ) 注解了。CIG30 在合成被含有很长锁住丰满的酸(VLCFA ) ,它是为 sphingolipids 和 ceramides 的必要先锋。改变了骆驼毛的织物超敏性特征的压力回答,包括减少的根生长抑制并且与骆驼毛的织物处理减少了萌芽并且从叶子减少了水损失,被突变而产生之遗传的 hos3-1 和 hos3-2 异种展出。hos3-2 异种部分在它的抄本丰富被压制并且作为一个后退的特点被继承。进一步,在 35SCaMV 倡导者的控制下面的 HOS3 ORF 象 RD29A 一样恢复了野类型的 NaCl 根和骆驼毛的织物根生长敏感: 在变异的植物的 LUC 光。我们也这里证明 HOS3 野类型的基因机能上地补充 elo2 和 elo3 酵母异种的敏感到 monensin。而且, hos3-1 和 hos3-2 等位基因分享了增加的敏感到除草剂 Metolachlor,它在 VLCFA 的合成禁止酰链延伸,并且 HOS3 机能上地补充了 elo2 和 elo3 并且恢复了 VLCFA 的层次。一起,这些数据证实 HOS3 禁止调停骆驼毛的织物的压力回答并且含有控制为不能生活的应力发信号和回答的几个方面指的 VLCFA 小径和产品。结果也在有气孔的行为的控制为 ceramide 的一个角色提供支持。 | Tanya M. Quist Irina Sokolchik Huazhong Shi Robert J. Joly Ray A. Bressan Albino Maggio Meena Narsimhan Xia Li | 2009 | Molecular Plant2009，2，1： | 7 |
| 5 | Development of polyvinylpyrrolidone/paclitaxel self-assemblies for breast cancer显示文摘The goal of this investigation was to develop and demonstrate a polymer/paclitaxel selfassembly(PTX-SA) formulation. Polymer/PTX-SAs were screened based on smaller size of formulation using dynamic light scattering analysis. Additionally, fluorescence microscopy and flow cytometry studies exhibited that polyvinylpyrrolidone(PVP)-based PTX-SAs(PVP/PTX-SAs) had superior cellular internalization capability in MCF7 and MDA-MB-231 breast cancer cells. The optimized PVP/PTXSAs exhibited less toxicity to human red blood cells indicating a suitable formulation for reducing systemic toxicity. The formation of PVP and PTX self-assemblies was confirmed using fluorescence quenching and transmission electron microscopy which indicated that the PVP/PTX-SAs were spherical in shape with an average size range of 53.81 nm as detected by transmission electron microscopy(TEM).FTIR spectral analysis demonstrates incorporation of polymer and paclitaxel functional groups in PVP/PTX-SAs. Both proliferation(MTS) and clonogenic(colony formation) assays were used to validate superior anticancer activity of PVP/PTX-SAs in breast cancer cells over paclitaxel. Such superior anticancer activity was also demonstrated by downregulation of the expression of pro-survival protein(Bcl-x L), upregulation of apoptosis-associated proteins(Bid, Bax, cleaved caspase 7, and cleaved PARP)and β-tubulin stabilization. These results support the hypothesis that PVP/PTX-SAs improved paclitaxel delivery to cancer cells. | Pallabita Chowdhury Prashanth K.B.Nagesh Sheema Khan Bilal B.Hafeez Subhash C.Chauhan Meena Jaggi Murali M.Yallapu | 2018 | Acta Pharmaceutica Sinica B2018，8，4： | 7 |
| 6 | Delayed migration of K-wire into popliteal fossa used for tension band wiring of patellar fracture显示文摘被用于破裂固定的 K 电线和不锈钢电线的破裂不是不平常的,但是移植是稀罕的。我们报导为髌紧张乐队配线使用到腿弯部的窝的破 K 电线的移植的一个案例。破硬件通过手术被移开。我们想建议那 K 电线和电线固定使用了因为膝盖骨的破裂的治疗能移居进膝的以后的分隔空间并且引起临床的症状。在曾经,骨折统一了识别电线的硬件破裂或运动和移动的存在的内部固定以后的近临床、放射学的后续能避免如此的复杂并发症。 | Sanjay Meena Hira Lal Nag Senthil Kumar Nilesh Barwar Samarth Mittal Amit Singla | 2013 | Chinese Journal of Traumatology2013，16，3： | 7 |
| 7 | Hepatoprotective activity of Terminalia paniculata against paracetamol induced hepatocellular damage in Wistar albino rats显示文摘Objective:To evaluate the hepatoprotective activity of Terminalia paniculata against paracetamol induced hepatic damage in rats.Methods:The plant material was shade dried, powdered and extracted with ethanol.Liv 52 and silymarin were used as standard drugs and 2%gum acacia as a control(vehicle).Alteration in the levels of biochemical markers of hepatic damage like AST,ALT,ALP and lipid peroxides were tested,and phytochemical tests were also performed.Results:Paracetamol(2 g/kg) increased the serum levels of alanine aminotransfer (ALT),aspartate aminotransferase(AST),alkaline phosphatase(ALP) and the lipid peroxides. Treatment of Liv 52,silymarin and ethanolic extract of Terminalia paniculata(200 mg/kg) altered levels of biochemical marker and showed significant hepatoprotective activity.Ethanolic extract revealed the presence of phenolic compound and flavanoids.Our findings suggested that ethanolic bark extract of Terminalia paniculata possessed hepatoprotective activity in a dose dependent manner.Conclusions:Terminalia paniculata possesses hepatoprotective activity.It could be an effective and promising preventive agent against PCT induced hepatotoxicity. | Eesha BR Mohanbabu Amberkar V Meena Kumari K Sarath babu Vijay M Lalit M Rajput R | 2011 | Asian Pacific Journal of Tropical Medicine2011，4，6： | 5 |
| 8 | Identification, occurrence, and validation of DRE and ABRE Cis-regulatory motifs in the promoter regions of genes of Arabidopsis thaliana显示文摘Plants posses a complex co-regulatory network Researchwhich helps them to elicit a response under diverse adverse conditions.We used an in silico approach to identify the genes with both DRE and ABRE motifs in their promoter regions in Arabidopsis thaliana.Our results showed that Arabidopsis contains a set of 2,052 genes with ABRE and DRE motifs in their promoter regions.Approximately 72%or more of the total predicted 2,052 genes had a gap distance of less than 400 bp between DRE and ABRE motifs.For positional orientation of the DRE and ABRE motifs,we found that the DR form(one in direct and the other one in reverse orientation)was more prevalent than other forms.These predicted 2,052 genes include 155 transcription factors.Using microarray data from The Arabidopsis Information Resource(TAIR)database,we present 44 transcription factors out of 155 which are upregulated by more than twofold in response to osmotic stress and ABA treatment.Fifty-one transcripts from the onepredicted above were validated using semiquantitative expression analysis to support the microarray data in TAIR.Taken together,we report a set of genes containing both DRE and ABRE motifs in their promoter regions in A.thaliana,which can be useful to understand the role of ABA under osmotic stress condition. | Sonal Mishra Aparna Shukla Swati Upadhyay Sanchita Pooja Sharma Seema Singh Ujjal J.Phukan Abha Meena Feroz Khan Vineeta Tripathi Rakesh Kumar Shukla Ashok Shrama | 2014 | Journal of Integrative Plant Biology2014，56，4： | 5 |
| 9 | Study of locust bean gum reinforced cyst-chitosan and oxidized dextran based semi-IPN cryogel dressing for hemostatic application显示文摘Severe blood loss due to traumatic injuries remains one of the leading causes of death in emergency settings.Chitosan continues to be the candidate material for hemostatic applications due to its inherent hemostatic properties.However,available chitosan-based dressings have been reported to have an acidic odor at the wound site due to the incorporation of acid based solvents for their fabrication and deformation under compression owing to low mechanical strength limiting its usability.In the present study semi-IPN cryogel was fabricated via Schiff's base cross-linking between the polyaldehyde groups of oxidized dextran and thiolated chitosan in presence of locust bean gum(LBG)known for its hydrophilicity.Polymerization at12C yielded macroporous semi-IPN cryogels with an average pore size of 124.57±20.31 mm and 85.46%porosity.The hydrophobicity index of LBG reinforced semi-IPN cryogel was reduced 2.42 times whereas the swelling ratio was increased by 156.08%compare to control cryogel.The increased hydrophilicity and swelling ratio inflated the compressive modulus from 28.1 kPa to 33.85 for LBG reinforced semi-IPN cryogel.The structural stability and constant degradation medium pH were also recorded over a period of 12 weeks.The cryogels demonstrated lower adsorption affinity towards BSA.The cytotoxicity assays(direct,indirect)with 3T3-L1 fibroblast cells confirmed the cytocompatibility of the cryogels.The hemolysis assay showed<5%hemolysis confirming blood compatibility of the fabricated cryogel,while whole blood clotting and platelet adhesion assays confirmed the hemostatic potential of semi-IPN cryogel. | Lalit Kumar Meena Pavani Raval Dhaval Kedaria Rajesh Vasita | 2018 | Bioactive Materials2018，3，3： | 4 |
| 10 | latrogenic brachial artery injury during anterolateral plat- ing of humeral shaft fracture显示文摘 | Vishal Kumar Prateek Behera Sameer Aggarwal Umesh Kumar Meena | 2013 | Chinese Journal of Traumatology2013，16，6： | 4 |
| 11 | Does combined therapy of curcumin and epigallocatechin gallate have a synergistic neuroprotective effect against spinal cord injury?显示文摘Systematic inflammatory response after spinal cord injury(SCI) is one of the factors leading to lesion development and a profound degree of functional loss. Anti-inflammatory compounds, such as curcumin and epigallocatechin gallate(EGCG) are known for their neuroprotective effects. In this study, we investigated the effect of combined therapy of curcumin and EGCG in a rat model of acute SCI induced by balloon compression. Immediately after SCI, rats received curcumin, EGCG, curcumin + EGCG or saline [daily intraperitoneal doses(curcumin, 6 mg/kg; EGCG 17 mg/kg)] and weekly intramuscular doses(curcumin, 60 mg/kg; EGCG 17 mg/kg)] for 28 days. Rats were evaluated using behavioral tests(the Basso, Beattie, and Bresnahan(BBB) open-field locomotor test, flat beam test). Spinal cord tissue was analyzed using histological methods(Luxol Blue-cresyl violet staining) and immunohistochemistry(anti-glial fibrillary acidic protein, anti-growth associated protein 43). Cytokine levels(interleukin-1β, interleukin-4, interleukin-2, interleukin-6, macrophage inflammatory protein 1-alpha, and RANTES) were measured using Luminex assay. Quantitative polymerase chain reaction was performed to determine the relative expression of genes(Sort1, Fgf2, Irf5, Mrc1, Olig2, Casp3, Gap43, Gfap, Vegf, NfκB, Cntf) related to regenerative processes in injured spinal cord. We found that all treatments displayed significant behavioral recovery, with no obvious synergistic effect after combined therapy of curcumin and ECGC. Curcumin and EGCG alone or in combination increased axonal sprouting, decreased glial scar formation, and altered the levels of macrophage inflammatory protein 1-alpha, interleukin-1β, interleukin-4 and interleukin-6 cytokines. These results imply that although the expected synergistic response of this combined therapy was less obvious, aspects of tissue regeneration and immune responses in severe SCI were evident. | Jiri Ruzicka Lucia Machova Urdzikova Barbora Svobodova Anubhav G. Amin Kristyna Karova Jana Dubisova Kristyna Zaviskova Sarka Kubinova Meic Schmidt Meena Jhanwar-Uniyal Pavla Jendelova | 2018 | Neural Regeneration Research2018，13，1： | 4 |
| 12 | Role of NiMn_(9.3)Al_(4.0)Co_(14.1)Fe_(3.6)alloy on dehydrogenation kinetics of MgH_(2)显示文摘Hydriding and dehydriding properties of MgH_(2)-x wt.%NiMn_(9.3)Al_(4.0)Co_(14.1)Fe_(3.6)(x=10,25,50)nanocomposites have been investigated in present work.Doped alloy was prepared by arc melting method and ball milled with MgH_(2)to get nanocomposites.Onset temperature as low as 180℃was observed for MgH_(2)-50 wt%system which is 80℃lower than the as-milled MgH_(2)giving 131.34 KJ/mol activation energy.Structural analysis shows tetragonal,orthorhombic and monoclinic phases for MgH_(2),Al_(60)Mn_(11)Ni_(4)and Mg_(2)NiH_(4).Morphology by SEM were undertaken to investigate the effect of hydrogenation on nanostructured alloy.DSC studies show a single broad exothermic peak in the temperature range 48℃-353℃after alloy addition in MgH_(2).These results indicate that the hydrogenation properties of MgH_(2)nanocomposite have been improved compared to the as-milled MgH_(2). | Priyanka Meena Ramvir Singh V.K.Sharma I.P.Jain | 2018 | Journal of Magnesium and Alloys2018，6，3： | 3 |
| 13 | Wound healing activity of aqueous extract of Crotalaria verrucosa in Wistar albino rats显示文摘Objective:To evaluate the wound healing effect of aqueous extract of Crotalaria verrucosa(C. verrucosa) in rats.Methods:Three wound models including incision,excision and dead space wounds were used in this study.The parameters studied were breaking strength in incision models,granulation tissue dry weight,breaking strength and hydroxyproline content in dead space wounds,percentage of wound contraction and period of epithelialization in excision wound model.Results:Two doses of the extract with and without dexamethasone showed significant increases in mean hydroxyproline,total protein content and dry weight of granulation tissue but it was higher with dose 800 mg/kg comparing with the control.The dexamethasone treated group showed a significant(P<0.001) reduction in the wound breaking strength when compared to control group in incision type of wound model.Coadministration of C.verrucosa with dexamethasone significantly(P<0.001) increased the breaking strength compared to the dexamethasone treated only group.In excision wound model,the percentage of the wound contraction was significantly(P<0.01) increased by two doses of test extract on all the days except the lower dose which exhibited only on 12th,16th days of drug treatment and it also reversed the dexamethasone suppressed wound contraction.It significantly(P<0.001) reduced the time required for epithelialization and reversed the epithelialization delaying effect of dexamethasone (P<0.001).Conclusions:C.verrucosa was found to possess significant wound healing property. This was evident by decrease in the period of epithelialization,increase in the rate of wound contraction,skin breaking strength,and granulation tissue dry weight content.Hence C. verrucosa could be a good wound healing agent. | Meena Kumari Eesha BR Mohanbabu Amberkar Sarath babu Rajshekar Neelesh Kumar | 2010 | Asian Pacific Journal of Tropical Medicine2010，3，10： | 3 |
| 14 | Circulating MicroRNA Is a Biomarker of Pediatric Crohn Disease显示文摘 | Adam M Zahm Meena Thayu Nicholas J Hand Amber Horner Mary B Leonard Joshua R Friedman | 2011 | Journal of Pediatric Gastroenterology and Nutrition2011，，1： | 3 |
| 15 | Understanding the Removal and Fate of Selected Drugs of Abuse in Sludge and Biosolids from Australian Wastewater Treatment Operations显示文摘Illicit and pharmaceutical drugs are considered to be emerging contaminants of concern,and much research effort has gone into assessing their occurrence in wastewater.However,little information exists on their presence in treated sludge or biosolids.In this study,we examined sludge and biosolids from a large metropolitan wastewater treatment plant(WWTP)in Australia to determine the occurrence of five drugs of abuse,including benzoylecgonine as indicator of cocaine consumption,methamphetamine and 3,4-methylenedioxy methamphetamine(MDMA)as representative illicit stimulants,and codeine and morphine as pharmaceuticals with potential environmental risk.The samples were solid-phase extracted and analyzed by liquid chromatography–tandem mass spectrometry(LC–MS/MS).Benzoylecgonine and MDMA were present in raw sludge but were notably degraded during solids treatment processes,and were not detected in the dewatered sludge(after treatment)or in biosolids.Methamphetamine,codeine,and morphine were detected in all biosolids samples at mean concentrations of 20–50 lg kg^-1.The presence of these three drugs in biosolids shows that these compounds are relatively stable in the solids and in soil,and can persist in biosolids for at least several years.A simple environmental risk assessment based on estimated risk quotients(RQs)for these compounds indicated that the potential environmental risks associated with the land application of biosolids are very low at typical Australian biosolids application rates. | Meena K.Yadav Cobus Gerber Christopher P.Saint Ben Van den Akker Michael D.Short | 2019 | Engineering2019，5，5： | 3 |
| 16 | Prevalence and ethnic differences in gallbladder disease in the United States显示文摘 | James E. Everhart Meena Khare Michael Hill Kurt R. Maurer | 1999 | Gastroenterology1999，，3： | 2 |
| 17 | Milk exosomes:Nature’s abundant nanoplatform for theranostic applications显示文摘Exosomes are a unique subpopulation of naturally occurring extracellular vesicles which are smaller intracellular membrane nanoparticle vesicles.Exosomes have proven to be excellent nanocarriers for carrying lipids,proteins,mRNAs,non-coding RNAs,and DNAs,and disseminating long-distance intercellular communications in various biological processes.Among various cell-line or biological fluid derived exosomes,milk exosomes are abundant in nature and exhibit many nanocarrier characteristics favorable for theranostic applications.To be an effective delivery carrier for their clinical translation,exosomes must inbuilt loading,release,targeting,and imaging/tracking characteristics.Considering the unmet gaps of milk exosomes in theranostic technology it is essential to focus the current review on drug delivery and imaging applications.This review delineates the efficiency of exosomes to load therapeutic or imaging agents and their successful delivery approaches.It is emphasized on possible modifications of exosomes towards increasing the stability and delivery of agents.This article also summarizes the specific applications and the process of developing milk exosomes as a future pharmaceutical drug delivery vehicle. | Benilde Adriano Nycol M.Cotto Neeraj Chauhan Meena Jaggi Subhash C.Chauhan Murali M.Yallapu | 2021 | Bioactive Materials2021，6，8： | 2 |
| 18 | Correlation of Brain Biomarker Neuron Specific Enolase (NSE) with Degree of Disability and Neurological Worsening in Cerebrovascular Stroke显示文摘 | Anuradha Bharosay Vivek Bharosay Meena Varma Kiran Saxena Ajoy Sodani Ravi Saxena | 2012 | Indian Journal of Clinical Biochemistry2012，，2： | 2 |
| 19 | Spontaneous atraumatic dislocation of sternoclavicu- lar joint in Reiter's syndrome显示文摘 | Vijay Kumar Digge Sanjay Meena Shah Alam Khan Ravi Mittal | 2012 | Chinese Journal of Traumatology2012，15，4： | 2 |
| 20 | Effect of calcium lactate on compressive strength and self-healing of cracks in microbial concrete显示文摘This paper presents the effect on compressive strength and self-healing capability of bacterial concrete with the addition of calcium lactate.Compared to normal concrete,bacterial concrete possesses higher durability and engineering concrete properties.The production of calcium carbonate in bacterial concrete is limited to the calcium content in cement.Hence calcium lactate is externally added to be an additional source of calcium in the concrete.The influence of this addition on compressive strength,self-healing capability of cracks is highlighted in this study.The bacterium used in the study is bacillus subtilis and was added to both spore powder form and culture form to the concrete.Bacillus subtilis spore powder of 2 million cfu/g concentration with 0.5%cement was mixed to concrete.Calcium lactates with concentrations of 0.5%,1.0%,1.5%,2.0%,and 2.5%of cement,was added to the concrete mixes to test the effect on properties of concrete.In other samples,cultured bacillus subtilis with a concentration of 1×10^cells/mL was mixed with concrete,to study the effect of bacteria in the cultured form on the properties of concrete.Cubes of 100 mm×100 mm×100 mm were used for the study.These cubes were tested after a curing period of 7,14,and 28 d.A maximum of 12%increase in compressive strength was observed with the addition of 0.5%of calcium lactate in concrete.Scanning electron microscope and energy dispersive X-ray spectroscopy examination showed the formation of ettringite in pores;calcium silicate hydrates and calcite which made the concrete denser.A statistical technique was applied to analyze the experimental data of the compressive strengths of cementations materials.Response surface methodology was adopted for optimizing the experimental data.The regression equation was yielded by the application of response surface methodology relating response variables to input parameters.This method aids in predicting the experimental results accurately with an acceptable range of error.Findings of this investigation indicated the influence of added calcium lactate in bio-concrete which is quite impressive for improving the compressive strength and self-healing properties of concrete. | Kunamineni VIJAY Meena MURMU | 2019 | Frontiers of Structural and Civil Engineering2019，13，3： | 2 |
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