Bulletin of Scientific Research
Latest articles in this journal
Bulletin of Scientific Research pp 59-65; https://doi.org/10.34256/bsr2117
The objective of this work is to study the antimicrobial effect of in-vitro grown leaf extracts of Withania somnifera (L.) against some selected known microorganisms and the use of its constituents present there for the preparation of therapeutic compounds. This is evaluated by using zone of inhibition studies and minimum inhibitory concentration. The microorganisms used include Shigella flexneri, Salmonella typhimurium, Vibrio cholera and Candida parapsilosis. Inhibition zones of plant extracts were compared with standard antibiotics like Neomycin, and Kanamycin. Inhibition zones are revealed by methanol extract which is comparatively more than the ethanol extract. For methanol extract, Salmonella typhimurium shows the highest inhibition zone (25.13±0.52) whereas Vibrio cholera shows the least inhibition zone (21.33±0.53). The same extract shows maximum antimicrobial activity against Salmonella typhimurium followed by Candida parapsilosis and Shigella flexneri. These possibilities can build-up a novel idea in the preparation of pharmaceutical products.
Bulletin of Scientific Research pp 51-58; https://doi.org/10.34256/bsr2116
In the present study, the effect of china clays on the sintering, strength and dielectric behavior of electrical ceramic fly ash/china clay (FA/CC) composite insulator is investigated. The different composition of samples containing different china clay (CC) contents of 10, 20, 30, 40, and 50 % are prepared using the uniaxial pressure technique applying 10 MPa pressure. At 1200 °C, for the composition having 40 wt% china clays, the maximum resistivity is calculated and is 39.5 × 107 Ωm. The composite is highly competence with china clays-based insulators. Further, the prepared composite is also analysed using different characterization technique such as x-ray diffraction, field emission scanning electron microscopy with energy dispersive analysis, fourier transformation infra-red spectroscopy, dielctric, and thermo gravimetric analysis. Frequency dielectric value of the composite is estimated at room temperature in the frequency range of 1-500 kHz at room temperature. According to the resistivity and dielectric properties, the composite has enormous potential for the electrical insulator application.
Bulletin of Scientific Research, Volume 3, pp 41-50; https://doi.org/10.34256/bsr2115
A preliminary investigation is provided to encouraging results for comprehensive studies on different aspects of the plant root - Ixora johnsonii Hook.f. Root of this plant was studied to fix the parameters for pharmacognostical standards. The present study are highlights the pharmacognostical evaluation of root which includes macroscopic and microscopic features. Further, preliminary phytochemical analyses, organoleptic character, fluorescence behavior of different extracts and histochemical localization of phytochemicals. As there is no pharmacognostical work on record of this ethno botanically much valued drug, the present work was taken up with a view to lay down standards, which could be useful to detect the authenticity of this pretty plant.
Bulletin of Scientific Research, Volume 3, pp 32-40; https://doi.org/10.34256/bsr2114
This study made setups that can be used in solar powered drying of washed clothing. This was used to analyze and test the performance, and determined if there is significant difference on the drying rate of set ups related to traditional and experimental method. A solar drying chamber was designed to use local materials in which the frame is made of bamboo with walls made of plastic to trap the heat of the sunlight entering the chamber. There were four set ups that were established in the gathering of data: S-1 is with electric fan, S-2 is with electric fan and electric flat iron, S-3 which did not use the drying chamber, is a traditional method where the garments C-1, C-2, C-3, C-4 & C-5 of different sizes, shapes, width and weight were dried under the heat of the sun. S-4 is almost similar to S-3 but the difference is that the garments were dried with no sunlight. The drying chamber alone is effective to reduce the moisture content of the garments using sunlight. Using the electric fan and electric flat iron increased the circulation of the enclosed hot air and boasted the drying capacity. Although it was computed that P > ? in comparison of the data in all set ups, it is insufficient to conclude that there is no significant difference on data of the experimental and traditional set ups since the data for the traditional set ups are not complete until the garments are totally dried.
Bulletin of Scientific Research, Volume 3, pp 21-31; https://doi.org/10.34256/bsr2113
Cleistopholis patens is a tropical plant that is used in the treatment of many bacterial and fungal infections. In this study, the antibacterial action against some human pathogens and the fatty acid profile of the plant were investigated. The plant was found to be active against Salmonella typhi Streptococcus pyogenes, Staphylococcus aureus while Shigella dysenteriae was resistant. The comparative antibiotic test revealed that only Staphylococcus aureus was sensitive to chloramphenicol and gentamycin. The purified extract showed lesser activity than the crude extract. Phytochemical components include; glycosides, steroids, Phenol, tanins and saponins. Anticonstituents include tanin (2.32mg/g), phenol (2.50 mg/g), phytate (15.65 mg/g), oxalate (6.57 mg/g), saponin (9.71 mg/g) and flavonoids (6.49 mg/g). The GCMS profile of the ethyl acetate extract of the plant revealed 23 fatty acid including 9-Hexadecanoic acid, (25.11%), 6 octadecanoic acid (21.98%), n Hexadecanoic (4.62%), Cyclopentaneundecanoic acid, methyl ester (2.05%). Heptacosanoic acid, methyl ester (2.05%), Decanoic acid, methyl ester (1.74%), Oleic acid (4.38%), 16-Octadecenoic acid, methyl ester (3.55%) amongst others.
Bulletin of Scientific Research, Volume 3, pp 13-20; https://doi.org/10.34256/bsr2112
The single crystal of cis-2,6-bis(4-chlorophenyl)-3,3-dimethylpiperidin-4-one (4C3DMPO) has been grown using a slow evaporation technique. 4C3DMPO is a non-centrosymmetric crystal which crystallizes in the orthorhombic system with space group Pna21. Benzene is used as a solvent for the crystal growth based on solubility studies. The mechanical studies, using microhardness methods, have also been carried out. The compound is characterised using UV, FT-IR and NMR spectral studies. Furthermore, the thermal stability of the crystal is established by TG/DTA. The nonlinear optical studies (SHG) of the crystal have been determined using the Kurtz and Perry powder technique and the activity observed is 2.5 times greater than that of KDP.
Bulletin of Scientific Research, Volume 3, pp 1-12; https://doi.org/10.34256/bsr2111
Plant growth promoting rhizobacter (PGPR) are adapted to adverse conditions and protect plants from the deleterious effects of some environmental stresses. The aim of the present study, the drought tolerant plants growth promoting bacteria (PGRB) were isolate and characterized from chilli crop (CapsicumannumL). From the rhizosphere soil twelve bacteria were isolated and characterized based on their biochemical and sugar fermentation. The drought stress tolarent stains were screened by production of exo polysaccharides and the plant growth promoting activities like production of IAA and PO4 solubilization were screened. Therefore the present study report that PGRB showed good stress tolerance under drought condition in chilli crop.
Bulletin of Scientific Research, Volume 2, pp 29-35; https://doi.org/10.34256/bsr2024
Of late there has been an increase in use of wireless communication system. The recent approach used is Massive-MIMO technology. But in the current scenario where spectrum is limited, the demand for high data degrades the quality of services. Therefore, OFDM system was proposed. Though coupling OFDM system with MIMO can further improve the performance of next generation wireless systems, there are certain issues like antenna design, channel estimation, PAPR etc. which requires due consideration. Amongst them, PAPR is the major problem that contributes high in performance degradation. To overcome this issue, Modified Firefly algorithm is used which was inspired the behaviour of fireflies. With the firefly algorithm, PAPR is highly reduced leading to better performance.
Bulletin of Scientific Research, Volume 2, pp 8-13; https://doi.org/10.34256/bsr2022
Fast beaming tracking and security are important factors for the development of communication technology. A Retrodirective antenna (RDA) technique has been attenuated to one way of improving security. It has the interesting property of automatically responding to an incoming signal location without any prior knowledge of the direction of that source. The purpose of this paper is to design a Rat race coupler which acts as a Retrodirective mode in ANSYS. The resonant frequency of the coupler is 2.4 GHz. The Proposed Rat race couplers have been devised using the Glass Epoxy substrate (FR4) with dielectric constant (?r = 4.4). S parameters, radiation pattern, insertion and isolation losses are obtained from ANSYS software
Bulletin of Scientific Research, Volume 2, pp 14-28; https://doi.org/10.34256/bsr2023
A new multilevel inverter with less no of power switches is proposed. This is based on cascaded H-bridge topology. The design and analysis of 31-level reduced switch inverter with different modes of operation are presented in this paper. The proposed inverter is asymmetric in nature and it uses unequal DC voltage sources. PD-PWM modulation technique has been used here to get proper switching. The proposed idea has been validated through simulation and the received results provides better efficiency, less low order harmonics and less switching losses.