Wide range humidity sensing of LiCl incorporated in mesoporous silica circular discs

Lithium chloride (LiCl) incorporated MCM-41 has been synthesised by sol-gel method using tetraethyl orthosilicate as a precursor in basic medium. 5, 10, 15, 20, 25, 30 and 35 wt% of LiCl were incorporated in mesoporous silica to investigate the humidity sensing. With increasing wt% of LiCl broadening of O–H peak is observed in the Fourier Transform Infrared spectra, indicating greater adsorption of hydroxyl groups on porous silica. The surface area of the MCM-41 circular discs was determined by Brunauer?Emmett?Teller (BET). Scanning electron microscopy images suggest that incorporation of LiCl leads to coalescence of grains in mesoporous silica. 25 wt% LiCl incorporated MCM-41 showed a wide range linear response of impedance change for 11%–90% RH exhibiting 3.5-order drop in impedance at a 1 kHz frequency. The Nyquist plots for all compositions showed increased ionic conduction with increasing relative humidity.     

Pseudo-supersymmetry and third order intertwining operator

It has been shown how one can obtain an intertwining operator of order (in terms of derivatives) higher than two, linking a non-Hermitian Hamiltonian to its Hermitian conjugate partner. Explicit third order realization of this intertwining operator is derived for complex Scarf potential.     

Spiked and screened oscillatorsV(r) =Ar 2 +B/r 2 +C/r 4 +D/r 6 +F/(1 +Gr)2 and their elementary bound states

We show that the complicated superpositionsV(r) of several important phenomenological forces may still lead to an elementary form of doublets of bound states under transparent algebraic constraints. Constructively, we show how (and when) the constrained couplings preserve compatibility with the physical regularity of wavefunctions.     

Electromagnetic field in two-dimensional locally flat space-time

It is shown that an infinite-dimensional symmetry is present in two-dimensional electromagnetic field theory. The generators of the ensuing Virasoro algebra are explicitly calculated both for periodic and antiperiodic fields.     

Sine-Gordon equation in curved space-time

We study the static solution of the sine-Gordon wave equation in a background geometry determined by a point mass in 1+1 dimension.     

SU(3)×SU(3) symmetry breaking, (8, 8) Model and theη→3π decay

It is shown that the (8, 8) model and explicitηπ ⁰ mixing successfully explain theη→3π decay width whereas the decay width calculated from the mass difference is about one order less than the experimental value.     

Scaling in the mean of the p+p→π0+X inclusive reaction data and the energy dependence of Feynman variable

We have studied the p+p⁰+X inclusive reaction data of Carey et al. in the framework of the scaling in the mean hypothesis first proposed by Dao et al. These data have been used to obtain the gamma ray spectrum in terms of the average value of the Feynman variablex, written as x.A comparison with the observed gamma ray spectrum at Mt. Chacaltaya by the Japanese and Brazilian Group gives the energy dependence of x at very high energy.     

Use of combinatorial library screening to identify inhibitors of a bacterial two-component signal transduction kinase

Bacterial resistance to antibiotics is emerging as amajor concern to the medical community. Theappearance of several antibiotic-resistant strains,including multidrug-resistant Staphylococcusaureus, raises the prospect that infections by thesebacteria could soon become untreatable with currentlyavailable antibiotics. In order to address thisproblem, increased emphasis is being placed on thediscovery of novel classes of antibacterial agentsthat inhibit novel molecular targets using sources ofcompounds not yet exploited for antibiotic drugdiscovery. Novel classes of compounds can now berapidly investigated using combinatorial chemistryapproaches. This report describes the identificationof novel antibacterial compounds from a combinatoriallibrary of N-acetylated, C-amidated D-amino acidhexapeptides. This library of compounds was screenedfor inhibitors of CheA, a member of the bacterialtwo-component signal transduction kinase family. Several peptides with apparent IC₅₀ values in thelow micromolar range were identified. In addition toinhibiting CheA, these peptides inhibited mammalianprotein kinase C (from rat brain) with comparablepotency. Finally, these peptides were also found tohave significant antibacterial properties, althoughthe true mechanism by which they exhibited inhibitionof bacterial growth remains uncertain.     

Synthesis,characterisation and crystal structure analysis of bis (pyridine-2-carbaldehyde thiosemicarbazonato) cobalt(III) thio-cyanate monohydrate

The crystal structure of [CoL2](SCN)·H2O (L = pyridine-2-carbaldehyde thiosemicarbazonato) is reported. The structure, along with other physico-chemical studies, establishes that the compound is a low spin CoIII complex. This resolves confusion arising out of an e     

The potential of mid infrared spectroscopy (MIRS) for real time bioprocess monitoring

The need for effective bioprocess (fermentation) monitoring is growing in importance due to the rapid pace of change in the fermentation industry, and attendant financial pressures. Vibrational spectroscopy has shown great promise in bioprocess monitoring. In particular, recently attention has been focused on the capability of mid infrared spectroscopy (MIRS) to monitor multiple analytes in highly complex fermentation fluids. The potential of this powerful analytical technique is critically evaluated by discussion of relevant studies. The advantages and limitations of MIR are discussed in the context of “rival” technologies, such as near infrared, focusing especially on employing such techniques in bioprocesses for real time (either in situ or ex situ) measurements. The potential barriers to the development of MIRS for real time monitoring are identified and further research directions highlighted.