Aniline incorporated silica nanobubbles

We report the synthesis of stearate functionalized nanobubbles of SiO2 with a few aniline molecules inside, represented as C6H5NH2@SiO2@stearate, exhibiting fluorescence with red-shifted emission. Stearic acid functionalization allows the materials to be handled just as free molecules, for dissolution, precipitation, storage etc. The methodology adopted involves adsorption of aniline on the surface of gold nanoparticles with subsequent growth of a silica shell through monolayers, followed by the selective removal of the metal core either using sodium cyanide or by a new reaction involving halocarbons. The material is stable and can be stored for extended periods without loss of fluorescence. Spectroscopic and voltammetric properties of the system were studied in order to understand the interaction of aniline with the shell as well as the monolayer, whilst transmission electron microscopy has been used to study the silica shell

Microwave-assisted synthesis and characterizations of nanosized copper ferrite and barium titanate for antimicrobial applications

Science and technology of nanosized bimetallic oxide nanomaterials records the various properties and applications. Especially biomedical applications are viewed in particular due to its nanosized particle size. The present experimentation is reporting the microwave-assisted synthesis of nanosized bimetallic oxides like copper ferrite (CuFe2O4) and barium titanate (BaTiO3) by solid state combustion route using poly (vinyl alcohol) (PVA) as a fuel. The structural and morphological characterizations of the bimetallic oxide nanomaterials are performed out by X-ray diffraction (XRD) and scanning electron micrograph (SEM) tools respectively. These analyses report the crystalline nature of both samples. EDX spectral study is also undertaken to know the existence of different metals in the above-mentioned samples. Bonding nature of the bimetallic oxide samples were readied by Fourier transfer infrared (FT-IR) instrumentation. The study reviewed the varied vibrational modes confirms the phase formation of the samples. UV-Vis and thermal study of these bimetallic oxide samples are also studied extensively to know the thermal and absorption behavior respectively. TGA of both the samples are traced and are showing decomposition at rapid rate. In addition, the maximum absorption peaks due to π - π* transition confirms the sample formation. Antimicrobial activity of the prepared oxide samples was studied for antibacterial and antifungal behavior. Both samples showing considerable activity against various bacteria and fungi

Micropropagation and conservation of selected endangered anticancer medicinal plants from the Western Ghats of India

Globally, cancer is a constant battle which severely affects the human population. The major limitations of the anticancer drugs are the deleterious side effects on the quality of life. Plants play a vital role in curing many diseases with minimal or no side effects. Phytocompounds derived from various medicinal plants serve as the best source of drugs to treat cancer. The global demand for phytomedicines is mostly reached by the medicinal herbs from the tropical nations of the world even though many plant species are threatened with extinction. India is one of the mega diverse countries of the world due to its ecological habitats, latitudinal variation, and diverse climatic range. Western Ghats of India is one of the most important depositories of endemic herbs. It is found along the stretch of south western part of India and constitutes rain forest with more than 4000 diverse medicinal plant species. In recent times, many of these therapeutically valued herbs have become endangered and are being included under the red-listed plant category in this region. Due to a sharp rise in the demand for plant-based products, this rich collection is diminishing at an alarming rate that eventually triggered dangerous to biodiversity. Thus, conservation of the endangered medicinal plants has become a matter of importance. The conservation by using only in situ approaches may not be sufficient enough to safeguard such a huge bio-resource of endangered medicinal plants. Hence, the use of biotechnological methods would be vital to complement the ex vitro protection programs and help to reestablish endangered plant species. In this backdrop, the key tools of biotechnology that could assist plant conservation were developed in terms of in vitro regeneration, seed banking, DNA storage, pollen storage, germplasm storage, gene bank (field gene banking), tissue bank, and cryopreservation. In this chapter, an attempt has been made to critically review major endangered medicinal plants that possess anticancer compounds and their conservation aspects by integrating various biotechnological tool

A Combined Surface-Enhanced Raman–X-Ray Photoelectron Spectroscopic Study of 2-mercaptobenzothiazole Monolayers on Polycrystalline Au and Ag Films

The monolayers of 2-mercaptobenzothiazole (MBT) on polycrystalline Au and Ag films have been studied by surface-enhanced Raman (SERS) and X-ray photoelectron (XPS) spectroscopies. Whereas MBT adsorbs with its molecular plane flat on Ag, its plane is perpendicular on Au. This difference in adsorbate geometry is manifested as differences in the intensities of certain vibrational peaks in the Raman spectra. Ab initio molecular orbital (MO) calculations suggest that MBT adsorbs on Au in the thione form and on Ag in the thiol form. The monolayers are stable up to a temperature of 473 K, much higher than most of the self-assembled monolayers (SAMs) studied so far. The adsorption geometry does not undergo any significant change when the monolayers are heated, although minor changes are observed in the SER spectra of the Ag monolayer. Raman intensities of all the bands increase with heating, and the enhanced intensity is preserved even after cooling. This is attributed to monolayer-induced coalescence of gold islands leading to the formation of an extended self-assembly. XPS studies confirm chemisorption, although structural details are not manifested

Formation of a nickel hydroxide monolayer on Au through a self-assembled monolayer of 5,5%-dithiobis(2-nitrobenzoic acid):voltammetric, SERS and XPS investigations of the modified electrodes

The formation of self-assembled monolayers (SAM) of 5,5%-dithiobis (2-nitrobenzoic acid), DNBA on gold has enabled further derivatization of the electrode surface with functional moieties anchored to the surface bound molecules. A SAM of DNBA was formed on the Au surface. Nickel ions tethered to the SAM-covered Au surface, were subsequently derivatized electrochemically to yield nickel hydroxide overlayers, thereby showing the possibility of preparing ultra-thin films of metal oxides through solution chemistry. The nickel hydroxide surface coverage obtained on bare and SAM-covered electrodes was estimated from voltammetric peaks and it varied from one monolayer to about 300 monolayers. The formation of a monolayer of nickel hydroxide has been achieved for the first time by electrochemical modification. Further, the modified electrodes were subjected to SERS and XPS studies to understand their surface characteristics. Modified electrodes provide a catalytic pathway involving nickel hydroxide for the electro-oxidation of glucose in alkaline solutions

Fate of pulpectomized deciduous teeth: Bilateral odontogenic cyst?

Pulpectomy is preferably more conservative treatment option than the extraction of deciduous teeth despite few undesirable consequences of obturating materials of which odontogenic cysts are one. This article aims to report a case of an 11-year-old female child having bilateral odontogenic cysts, i.e., radicular and infected dentigerous cyst followed by pulpectomy of deciduous molars using zinc oxide eugenol which was surgically enucleated and followed up to 6 months until satisfactory healing of bone was observed. The article also emphasizes on the importance of regular follow-up of the pulpectomized tooth which can be harmful otherwise

Bilayer Tablet and IT' S TECHNOLOGY: an Overview

Bilayer tablet is new era for the successful development of controlled release formulation along with various features toprovide a way of successful drug delivery system. So use of bilayer tablet is a very different aspect for anti-inflammatoryand analgesic. Bi-layer tablet is suitable for sequential release of two drugs in combination, separate two incompatiblesubstances and also for sustained release tablet in which one Layer is immediate release as initial dose and second layer ismaintenance dose. Bilayer tablet is improved beneficial technology to overcome the shortcoming of the single layeredtablet. Several pharmaceutical companies are currently developing bi-layer tablets. For a variety of reasons: patentextension, therapeutic, marketing to name a few. To reduce capital investment, quite often existing but modified tabletpresses are used to develop and produce such tablets. This article explains about different techniques of bilayer tablet andwhy the development and production of quality bi-layer tablets needs to be carried out on purpose-built tablet presses toovercome common bi-layer problems, such as layer-separation, insufficient hardness, Inaccurate individual layer weightcontrol, cross-contamination between the layers, reduced yield etc

POWER MODELLING OF L.C.D. DISPLAY

 Now days most of embedded system used are battery operated. To predict the battery life, power consumption at various levels, like software and power taken by peripheral devices should be known in advance. The components of total power consumption are software power & power taken by peripheral devices these should be known to the designer. In this paper for prediction the modelling of L.C.D. by using statistical tools i.e. regression analysis. Here we must understand how much power required to display a particular character

Versatile core�shell SiO2@SrTiO3:Eu3+, Li+ nanopowders as fluorescent label for the visualization of latent fingerprints and anti-counterfeiting applications

To overcome the shortcomings encountered in enhancing the quality of latent finger prints (LFPs) by traditional powder dusting method, SiO2@SrTiO3:Eu3+ (1 mol), Li (1 wt) core�shell nanopowders (NPs) were prepared by using combustion process. LFPs were visualized by staining prepared samples on both porous and non-porous surfaces and were observed under the illumination of UV light of wavelength 254 nm. These LFPs reveals the detailed characteristic features such as lake, hook, island, bifurcation with high sensitivity, better selectivity and without background hindrance. SiO2@SrTiO3:EuLi NPs exhibited characteristic pure red emission peaks in the range of 530�760 nm which can be assigned to 5D0 � 7FJ (J = 0, 1, 2 and 3) transitions. By altering the number of coating cycles indistinct white light fluorescent to warm white emitting phosphors could be obtained with the single and same crystal phase. The spectral intensity parameters and Eu-O ligand behaviors were estimated by means of Judd-Ofelt (J-O) theory. The prepared core�shell SiO2@SrTiO3:Eu3+, Li NPs are explored as a fluorescent labeling agent for the visualization of LFPs and anti-counterfeiting applications. © 2017 Elsevier B.V