Birhanu
Corpus
Tariku Abena*
Biosensors are analytical devices and a hybrid form of physical and chemical sensing technique that convert a biological response into an electrical signal proportional to the concentration of a specific analytes. In its technical aspect, biosensing is a phenomenon that withholds set techniques for the production of an accessible detection signal of interaction between biological molecules and another molecule or analyte of interest. Such molecular device that enables sensing of these molecular interactions is called biosensors. IUPAC provide recognition to this type of sensors only some seventeen years prior to today. In principle, biosensors are receptor-transducer based tool which could be used for interpreting the biophysical or biochemical property of the medium. The presence of biological/organic recognition element which enables the detection of particular biological molecules in the medium distinguishes biosensors apart from other types of sensors. The first biosensor device was invented in order to measure blood glucose level in biological samples. This strategy involved electrochemical detection of oxygen or hydrogen peroxide by using immobilized glucose oxidase electrode. Since then, amazing progress has been made both in technology and applications of biosensors with innovative approaches involving electrochemistry, nanotechnology to bioelectronics.
Tesfaye Alamirew*, Solomon W Fantaa, Nigus Gabbiye and Delele Worku
DOI: 10.37421/2155-6210.2022.13.355
Recently graphen based nanocomposites are become an emerging research areas for fabrication of enzymatic biosensors due to their property of large surface area, conductivity and biocompatibility. This review summarizes recent research reports of graphen based nanocomposites for the fabrication of glucose and ethanol enzymatic biosensors. The newly fabricated enzyme free Microwave Treated Nitrogen Doped Graphen (MTN-d-GR) had provided highest sensitivity towards glucose and GCE/rGO/AuNPs/ADH composite had provided far highest sensitivity towards ethanol compared to other reported graphen based nanocomposites. The MWCNT/GO/ GOx and GCE/ErGO/PTH/ADH nanocomposites had also enhanced wide linear range for glucose and ethanol detection respectively.
Generally, graphen based nanocomposite enzymatic biosensors had fast direct electron transfer rate, highest sensitivity and wide linear detection ranges during glucose and ethanol sensing.
DOI: 10.37421/2155-6210.2023.13.354
Our search for the unification of electrostatic force and gravity is one of the most pressing research areas. Sir Newton’s universal gravitational constant G is and has been the key constant in the calculations of classical mechanics for the gravitational potential and force of attraction between two masses, as well as the motion in the solar system. Recent research work on gravity focused on finding low-frequency gravitational waves. In this paper it is shown that, Newton’s gravitational law and Coulomb’s electrostatic law are manifestations of the same fundamental interactions. G depends on the quantum physical composition of matter, being the atomic number/protons (Z) to atomic mass number (A) ratio. All planets orbiting the sun yield, within statistical significance, the same G. However, the reference frame of atomic nuclei is distinctly different for each element and from that of the solar/planetary system. In addition, the definition of what Newton called “gravity” is rooted in the relation of all orbital motion to Kepler’s third law. Kepler’s third law (α=R3/T2) and Sir Newton’s law of gravitational attraction (F=-GMm/R2) are fundamental references for orbital motion. After the full derivation, it is also shown that the coulomb force of attraction (F= -q2/(4πεoR2)) in the hydrogen atom yields a significantly same result as the Newtonian force of attraction between the proton and electron in the hydrogen atom, with a gravitational constant of 7.55 × 1028 N.m2.kg-2. It is shown that the unifying gravitational constant for all matter of nature is G=Z/A {1.525 1892 × 1029} N.m2.kg-2. It is further hypothesised, based on the outcome of the theoretical derivation and correlation of the results between the coulomb and gravitational forces that gravity is electrostatic in nature and that they are reciprocally special cases of the general formula derived and presented in this paper.
The conclusions drawn from the results are supported by the analyses of information, using existing solar system/planetary data and atomic physics data. The results were correlated and confirm the hypotheses.
Dayanand B Jadhav* and Rajendra D Kokate
DOI: 10.37421/2155-6210.2023.14.386
Highly stable, eco-friendly ZnO nanoparticles synthesized by an easy and cost-effective plant (Aloe barbadensis miller gel as crystal growth modifier) mediated synthesis route. The synthesized ZnO nanoparticles of average particle size 70 nm-90 nm. LPG sensing properties were systematically investigated. The ZnO nanoparticles exhibited outstanding gas sensing characteristics like higher gas response (~500 ppm LPG gas at 350°C), the reaction time (~3 sec), recovery time (~35 sec), excellent repeatability and good selectivity. Structural, morphological and phase conformation characteristics are measured using XRD, EDS, FESEM, TEM and FTIR. This work provides a completely unique green approach to synthesize ZnO nanoparticles for the LPG sensing application.
Biosensors & Bioelectronics received 1751 citations as per Google Scholar report
