The immobilization of the enzyme tyrosinase (Tyr) in lipid matrices can be explored to produce biosensors for detecting polyphenols, which is relevant food industry. Herein, we shall demonstrate importance composition immobilize Langmuir-Blodgett (LB) films. Tyr could incorporated into Langmuir monolayers arachidic acid (AA), 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) and 1,2-dipalmitoy...

Adsorption Kinetics describes the rate at which solute is adsorbed and resident time of adsorbates on solid-liquid interface. isotherms play important role in determining interaction between adsorbate adsorbent optimum adsorption capacity adsorbent. This article considered selected kinetics models. Pseudo first order, second Elovich, Bhattacharya Venkobachar, Natarajan Khalaf were reviewed assu...

Optical second harmonic generation (SHG) is used as a noninvasive probe of two-dimensional (2D) ferroelectricity in Langmuir-Blodgett (LB) films of copolymer vinylidene fluoride with trifluorethylene. The surface 2D ferroelectric-paraelectric phase transition in the topmost layer of LB films and a thickness independent (almost 2D) transition in the bulk of these films are observed in temperatur...

An exact solution of the collisionless time-dependent Vlasov equation is found for first time. By means this behavior Langmuir waves in nonlinear stage considered. The analysis restricted by consideration approximation keeping second power electric strength. It shown that general with finite amplitudes are not subject to damping. Only linear approximation, when wave amplitude very small, experi...

In this paper, a Langmuir isothermal adsorption model was developed based on the assumption of multi-molecular layer adsorption, and then experiments were carried out using coconut shell activated carbon samples as adsorbent. The results showed that is more widely used than traditional single-molecular model, it also simple, intuitive standardized BET equation assumption, its application conven...

Anna Beltrame,* Maurizio Ruscio,† Barbara Cruciatti,‡ Angela Londero,* Vito Di Piazza,§ Roberto Copetti,§ Valentino Moretti,† Paolo Rossi,¶ Gian Luigi Gigli,¶ Luigia Scudeller,* and Pierluigi Viale* *University of Udine, Udine, Italy; †Hospital of San Daniele, San Daniele, Italy; ‡Hospital of Pordenone, Pordenone, Italy; §San Antonio Abate Hospital, Tolmezzo, Italy; and ¶Hospital of Udine, Udin...

In summer at night in the Bering Sea hydromedusae and scyphomedusae formed dense aggregations at the surface in convergences apparently produced by Langmuir circulation cells. During strong winds distance between parallel rows regularly exceeded 100 m; densities of medusae within rows reached 1,000 m-3. Physical and behavioral factors can increase spatial aggregation and thereby alter the rate ...

In this study, calcined Lapindo volcanic mud (LVM) was used as an adsorbent to remove an anionic dye, methyl orange (MO), from an aqueous solution by the batch adsorption technique. Various conditions were evaluated, including initial dye concentration, adsorbent dosage, contact time, solution pH, and temperature. The adsorption kinetics and equilibrium isotherms of the LVM were studied using p...

The bioavailability and ultimate fate of heavy metals in the environment are controlled by adsorption-desorption process. Batch equilibrium experiments were performed to assess the effects of pH and low molecular weight organic acids (LMWOAs) on competitive adsorption and desorption of cadmium and lead in paddy soils from China. The results indicated that both soils exhibited greater sorption c...