The Position of Lead in a Challenging World of Modern Technology

The story of lead has been remarkable in several respects. The consumption of lead during the whole of the 19th century was of the same order as that during the 20-year period between the great wars. Subsequently, the growth rate was much faster and in the last ten years the world consumption of lead was more than that during the entire 20-year period between the wars. The growth in consumption of lead in the past decade has shown a steady upward trend, due not only to the increased use of lead in the established applications but also to the new appli-cations of this meta

catena-Poly[[[triaqua­sulfatozinc(II)]-μ-3,3′-bis­(3-pyrid­yl)-1,1′-(m-phenyl­ene)diurea] methanol solvate monohydrate]

In the title coordination polymer, {[Zn(SO4)(C18H16N6O2)(H2O)3]·CH3OH·H2O}n, the Zn2+ ion adopts a slightly distorted cis-ZnN2O4 octa­hedral geometry arising from three coordinated water mol­ecules, one sulfate ion and two bridging 3,3′-bis­(3-pyrid­yl)-1,1′-(m-phenyl­ene)diurea (bpmpbu) ligands. The dihedral angles between the central benzene ring and two terminal pyridine rings of the bpmbpu mol­ecule are 10.58 (17) and 34.63 (16)°. In the crystal, the ligands bridge the ZnII ions, thus generating a one-dimensional zigzag coordination polymer propagating in [010]. The crystal structure features extensive N—H⋯O and O—H⋯O hydrogen-bonding inter­actions

Charge-monopole versus Gravitational Scattering at Planckian Energies

The amplitude for the scattering of a point magnetic monopole and a point charge, at centre-of-mass energies much larger than the masses of the particles, and in the limit of low momentum transfer, is shown to be proportional to the (integer-valued) monopole strength, assuming the Dirac quantization condition for the monopole-charge system. It is demonstrated that, for small momentum transfer, charge-monopole electromagnetic effects remain comparable to those due to the gravitational interaction between the particles even at Planckian centre-of-mass energies.Comment: 9 pages, revtex, IMSc/93-4

3,3′-{Ethane-1,2-diylbis[carbonylbis(azanediyl)]}dipyridinium tetra­chloridoplatinate(II)

In the crystal structure of the title compound, (C14H18N6O2)·[PtCl4], the cation and square-planar anion are located on special positions (on a twofold axis and an inversion centre, respectively). In the crystal structure, N—H⋯Cl hydrogen bonds lead to a staircase-like motif. The central ethane backbone of the cation is disordered over two positions of equal occupancy

Parity Violating Gravitational Coupling Of Electromagnetic Fields

A manifestly gauge invariant formulation of the coupling of the Maxwell theory with an Einstein Cartan geometry is given, where the space time torsion originates from a massless Kalb-Ramond field augmented by suitable U(1) Chern Simons terms.We focus on the situation where the torsion violates parity, and relate it to earlier proposals for gravitational parity violation.Comment: 7 Pages, Latex . no figures, Replaced with Revtex version, many references added and typos correcte

Relationship between electrophilicity index, Hammett constant and nucleus-independent chemical shift

Inter-relationships between the electrophilicity index (Ω), Hammett constant (óp @#@) and nucleusindependent chemical shift (NICS (1) - NICS value one ångstrom above the ring centre) have been investigated for a series of meta- and para-substituted benzoic acids. Good linear relationships between Hammett constant vs electrophilicity and Hammett constant vs NICS (1) values have been observed. However, the variation of NICS (1) against CO shows only a low correlation coefficient

Electromagnetic and Gravitational Scattering at Planckian Energies

The scattering of pointlike particles at very large center of mass energies and fixed low momentum transfers, occurring due to both their electromagnetic and gravitational interactions is re-examined in the particular case when one of the particles carries magnetic charge. At Planckian center-of-mass energies, when gravitational dominance is normally expected, the presence of magnetic charge is shown to produce dramatic modifications to the scattering cross section as well as to the holomorphic structure of the scattering amplitude.Comment: 33 pages, Revtex file, no figs; a footnote and two references adde

Pros and Cons of Curcumin as Bioactive Phyto-Compound for Effective Management of Insect Pests

Phyto-compounds as insecticides have expanded impetus in recent insect pest management programme owing to health hazards and perpetual toxicity of conservatively applied deleterious insecticides of diverse commercial brands. Turmeric plant produces fleshy rhizomes of bright yellow to orange color in its root system, which are the source of commercially available spice turmeric. Curcumin, a Phytochemical gives yellow colour to turmeric and is used for time immemorial for most of the remedial practices. Curcumin is also used as a spice in foods, as a dye for fleeces and as an ingredient in dietetic supplements.  As root powder, turmeric is used for its flavoring properties as a spice, food preservative and food-coloring agent. Turmeric has a long history of soothing uses as it is accredited with a diversity of imperative valuable properties such as its antioxidant, antibacterial, anti-inflammatory, analgesic and digestive properties respectively. The fresh juice, the aqueous extracts and the essential oil of the plant are endorsed with fascinating pesticidal properties against certain pests of agricultural importance as well as a perceptible repugnant activity against noxious mosquito species.  Results have exposed a pleasurable impending potentiality of turmeric as a natural pesticide for achievable use in current crop protection and thus an exceedingly promising future towards this route, that is, the possibility of effective control of certain pests of agricultural importance with the use of turmeric products as an economical and more effective eco-friendly alternative to chemical pesticides which is by now put into practice