High‐Resolution Submillimeter Wave Spectroscopy of Hydrogen Sulphide with Heterodyne Spectrometer

A submillimeter heterodyne spectrometer using continuous wave optically pumped molecular laser as local oscillator and Schottky diode as mixer was developed at Physical Research Laboratory, Ahmedabad (India) for quantitative spectroscopy of polyatomic molecules in laboratory. The experimental details of spectrometer and its application to study of molecular line parameters are presented. In particular line strength, collision line width (self and foreign) of H₂S 5_5,05_4,1 transition¹(579.799 GHz) have been measured. Air molecules have been used as foreign (perturbing) molecules taking Earths atmosphere into consideration².     

System Dynamics modeling of Chlamydia infection for screening intervention planning and cost-benefit estimation

^** Corresponding author. Email: P.R.Harper{at}maths.soton.ac.uk Genital Chlamydia trachomatis infection is the most common sexuallytransmitted infection in the UK. It constitutes a major publichealth problem given that the majority of infections are asymptomaticwhich can lead to serious long-term medical consequences ifnot treated. This paper describes a System Dynamics model forcapturing Chlamydia infection dynamics within a population,incorporating the behaviour of different risk groups, and providesa cost-benefit study for screening using data collected fromthe Department of Health opportunistic Chlamydia screening programmein Portsmouth. Furthermore, we demonstrate that high-risk groupsare key in determining the overall infection dynamics of thesystem, and quantify screening rates required to manage infectionprevalence within the wider population.     

Pattern recognition methods for protein functional site prediction

Protein functional site prediction is closely related to drug design, hence to public health. In order to save the cost and the time spent on identifying the functional sites in sequenced proteins in biology laboratory, computer programs have been widely used for decades. Many of them are implemented using the state-of-the-art pattern recognition algorithms, including decision trees, neural networks and support vector machines. Although the success of this effort has been obvious, advanced and new algorithms are still under development for addressing some difficult issues. This review will go through the major stages in developing pattern recognition algorithms for protein functional site prediction and outline the future research directions in this important area.     

Tessellations of solvmanifolds

Let be a closed subgroup of a connected, solvable Lie group , such that the homogeneous space is simply connected. As a special case of a theorem of C. T. C. Wall, it is known that every tessellation of is finitely covered by a compact homogeneous space . We prove that the covering map can be taken to be very well behaved - a ``crossed" affine map. This establishes a connection between the geometry of the tessellation and the geometry of the homogeneous space. In particular, we see that every geometrically-defined flow on that has a dense orbit is covered by a natural flow on .

     

(<Emphasis Type="Italic">T</Emphasis>, <Emphasis Type="Italic">S</Emphasis><Subscript><Emphasis Type="Italic">i</Emphasis></Subscript>) Policy Inventory Model for Deteriorating Items with Time Proportional Demand

An EOQ model is reconsidered here in which the demand rate is changing linearly with time and the deterioration is assumed to be a constant fraction of the onhand inventory. The planning horizon is finite and known and the replenishment periods are assumed to be constant. The problem is to find the optimal number of replenishments, which are instantaneous. When there is no deterioration, the model developed is related to the corresponding model for nondeteriorating items. An example followed by sensitivity analysis is given to illustrate the derived results.     

Extraction and spectrophotometric determination of lead(II) with pyridine-2-acetaldehyde salicyloylhydrazone

Lead(II) reacts with pyridine-2-acetaldehyde salicyloylhydrazone (PASH) in the pH range 8.6-9.3 to form a yellow-green, 1:2 chelate which can be extracted into chloroform. Beer's law is obeyed in the concentration range 1.5-6.2 mug ml(-1) of lead(II). The molar absorptivity of the extracted species is 1.93 x 10(4) l mol(-1) cm(-1) at 380 nm. The proposed method is sensitive, simple, rapid, accurate and has been satisfactorily applied for the determination of lead in synthetic mixtures, alloys, water and soil samples.     

Rearrangement in the reaction of oxindole with o-nitrobenzyl chloride

The alkylation of oxindole with o-nitrobenzyl chloride produces three products, 5a, 6, and 10. The N-hydroxyindoloquinolone 5a probably arises by rearrangement of an initial alkylation product as shown in Scheme 1. The indoloquinolone 6 is formed by base-catalyzed elimination of o-nitrobenzaldehyde from the dialkylation product 10 and also apparently by a thermal process most simply considered as a 1,5-sigmatropic rearrangement of 10 → 12.