Due to rapid construction,necessity for raw materials of concrete,especially coarse aggregate,tends to increase the danger of early exhaustion of the natural resources.An alternative source of raw materials would perh...Due to rapid construction,necessity for raw materials of concrete,especially coarse aggregate,tends to increase the danger of early exhaustion of the natural resources.An alternative source of raw materials would perhaps delay the advent of this early exhaustion.Recycled coarse aggregate(RCA)plays a great role as an alternative raw material that can replace the natural coarse aggregate(NCA)for concrete.Previous studies show that the properties of RCA concrete are inferior in quality compared to NCA concrete.This article attempts to study the improvement of properties of RCA concrete with the addition of bacteria named as Bacillus subtilis.The experimental inves-tigation was carried out to evaluate the improvement of the compres-sive strength,capillary water absorption,and drying shrinkage of RCA concrete incorporating bacteria.The compressive strength of RCA concrete is found to be increased by about 20%when the cell con-centration of B.subtilis is 10^(6) cells/ml.The capillary water absorptionas well as drying shrinkage of RCA are reduced when bacteria is incorpo-rated.The improvement of RCA concrete is confirmed to be due to the calcium carbonate precipitation as observed from the microstructure studies carried out on it such as EDX,SEM,and XRD.展开更多
In present scenario,nanoscience and nanotechnology have drawn the attention of scientist and researchers as leading source of technology with a wide range of useful applications like pharmaceuticals,electronics,biotec...In present scenario,nanoscience and nanotechnology have drawn the attention of scientist and researchers as leading source of technology with a wide range of useful applications like pharmaceuticals,electronics,biotechnology,biomedicine,wastewater treatment,space technology,industries and medical sciences[1].The physico-chemical characteristics of nanomaterial could make them an ideal material for various applications.Viewing this revolutionary effect,Norio Taniguchi,a famous scientist in 1974 coined the term‘nanotechnology’[2].展开更多
Microbe-related,especially viral-related pandemics have currently paralyzed the world and such pathogenesis is expected to rise in the upcoming years.Although tremendous efforts are being made to develop antiviral dru...Microbe-related,especially viral-related pandemics have currently paralyzed the world and such pathogenesis is expected to rise in the upcoming years.Although tremendous efforts are being made to develop antiviral drugs,very limited progress has been made in this direction.The nanotheranostic approach can be a highly potential rescue to combat this pandemic.Nanoparticles(NPs)due to their high specificity and biofunctionalization ability could be utilized efficiently for prophylaxis,diagnosis and treatment against microbial infections.In this context,titanium oxide,silver,gold NPs,etc.have already been utilized against deadly viruses like influenza,Ebola,HIV,and HBV.The discovery of sophisticated nanovaccines is under investigation and of prime importance to induce reproducible and strong immune responses against difficult pathogens.This review focuses on highlighting the role of various nano-domain materials such as metallic NPs,magnetic NPs,and quantum dots in the biomedical applications to combat the deadly microbial infections.Further,it also discusses the nanovaccines those are already available for various microbial diseases or are in clinical trials.Finally,it gives a perspective on the various nanotechnologies presently employed for efficient diagnosis and therapy against disease causing microbial infections,and how advancement in this field can benefit the health sector remarkably.展开更多
文摘Due to rapid construction,necessity for raw materials of concrete,especially coarse aggregate,tends to increase the danger of early exhaustion of the natural resources.An alternative source of raw materials would perhaps delay the advent of this early exhaustion.Recycled coarse aggregate(RCA)plays a great role as an alternative raw material that can replace the natural coarse aggregate(NCA)for concrete.Previous studies show that the properties of RCA concrete are inferior in quality compared to NCA concrete.This article attempts to study the improvement of properties of RCA concrete with the addition of bacteria named as Bacillus subtilis.The experimental inves-tigation was carried out to evaluate the improvement of the compres-sive strength,capillary water absorption,and drying shrinkage of RCA concrete incorporating bacteria.The compressive strength of RCA concrete is found to be increased by about 20%when the cell con-centration of B.subtilis is 10^(6) cells/ml.The capillary water absorptionas well as drying shrinkage of RCA are reduced when bacteria is incorpo-rated.The improvement of RCA concrete is confirmed to be due to the calcium carbonate precipitation as observed from the microstructure studies carried out on it such as EDX,SEM,and XRD.
文摘In present scenario,nanoscience and nanotechnology have drawn the attention of scientist and researchers as leading source of technology with a wide range of useful applications like pharmaceuticals,electronics,biotechnology,biomedicine,wastewater treatment,space technology,industries and medical sciences[1].The physico-chemical characteristics of nanomaterial could make them an ideal material for various applications.Viewing this revolutionary effect,Norio Taniguchi,a famous scientist in 1974 coined the term‘nanotechnology’[2].
文摘Microbe-related,especially viral-related pandemics have currently paralyzed the world and such pathogenesis is expected to rise in the upcoming years.Although tremendous efforts are being made to develop antiviral drugs,very limited progress has been made in this direction.The nanotheranostic approach can be a highly potential rescue to combat this pandemic.Nanoparticles(NPs)due to their high specificity and biofunctionalization ability could be utilized efficiently for prophylaxis,diagnosis and treatment against microbial infections.In this context,titanium oxide,silver,gold NPs,etc.have already been utilized against deadly viruses like influenza,Ebola,HIV,and HBV.The discovery of sophisticated nanovaccines is under investigation and of prime importance to induce reproducible and strong immune responses against difficult pathogens.This review focuses on highlighting the role of various nano-domain materials such as metallic NPs,magnetic NPs,and quantum dots in the biomedical applications to combat the deadly microbial infections.Further,it also discusses the nanovaccines those are already available for various microbial diseases or are in clinical trials.Finally,it gives a perspective on the various nanotechnologies presently employed for efficient diagnosis and therapy against disease causing microbial infections,and how advancement in this field can benefit the health sector remarkably.
