This study aimed to evaluate the efficacy of semi fermented and non fermented Camellia sinensis extracts (Black and Green tea) and comparison between them against Streptococcus mutans ATCC 25175, S. mitis ATCC 9811 and S. sanguis ATCC 10556 that are responsible for dental caries and bacteremias following dental manipulations. Minimum inhibitory concentrations of both tea extracts were assessed ...

Clathrate hydrates are crystalline compounds composed of hydrogen-bonded water molecules that form polyhedral cavities and trap small guest molecules such as methane, carbon dioxide, cyclopentane (CP), and tetrahydrofuran (THF). Understanding the formation and dissociation of clathrate hydrates is of significant importance to addressing some global challenges such as greenhouse gas mitigation a...

A roller bioreactor containing inert glass beads was employed to enhance naphthalene biodegradation in an aqueous solution. Mixed culture of microorganisms isolated from sewage waste sludge and adopted for biodegradation. The dissolution rate the phase studied at different conditions reactor. results indicate that best treatment were 40% 50% loads with 6 mm 5 sized beads, respectively, a rotati...

Glass beads of the Sr2MgSi2O7 stoichiometric composition and a non-stoichiometric with higher SiO2/SrO ratio doped Eu2O3/Dy2O3 were prepared through aerodynamic levitation coupled to CO2 laser heating. The glass subsequently treated at 1100 ºC produce glass-ceramics Sr2MgSi2O7: Eu2+, Dy3+ as main crystalline phase. glasses exhibit red emissions; after crystallisation, corresponding emit blue li...

The evolution of effective force chains percolating through a granular system under uniaxial compression can be investigated using the acoustic emission technique to obtain a better understanding of the global behaviour of granular media in terms of microscopic phenomena which occur at the level of discrete particles. It is known from praxis as well as from the theory that percolation effects a...

In an optical tweezers experiment intense laser light is tightly focused to intensities of MW/cm(2) in order to apply forces to submicron particles or to measure mechanical properties of macromolecules. It is important to quantify potentially harmful or misleading heating effects due to the high light intensities in biophysical experiments. We present a model that incorporates the geometry of t...

We investigated the effects of isoproterenol aryl glass beads on the electrical properties of cardiac muscle and related these to our previous results concerning biochemical and contractile effects (Ingebretsen et al., Circ, Rs., 40: 474-484, 1977). Beads (10-15) were placed near one end to guinea pig papillary muscles mounted horizontally in a bath perfused with Krebs-Henseleit solution at 30 ...

Abstract Components produced by additive manufacturing (AM) via direct metal laser sintering (DMLS) have typical as-fabricated surface defects. As a result, properties of AM products should be modified to increase their strength, anti-wear behavior, and at the same time ensure high corrosion resistance. Surface modification shot peening (SP) is considered suitable for engineering devices made 1...

Butterflies of the genus Heliconius are well known for their peculiar habits of utilizing pollen as a source of amino acids. Saliva plays a major role in the process of extracting amino acids and proteins from the pollen grains. In this investigation, we obtained samples of saliva from adult Heliconius melpomene by placing pumpkin pollen or fine glass-beads on the proboscis, which stimulates th...