Polymer materials of medical purpose and materials for dentistry

A wide range of polymer materials for medical purposes based on polysiloxane developed at the State Research Institute of Building Structures is presented. The properties of compositions cured by both end hydroxyl groups and the reaction of hydroxylation are considered and examples of their applications are presented.     

A highly selective magnetic solid-phase extraction method for preconcentration of Cd(II) using N,N′-bis(salicylidene)ethylenediamine in water and food samples

Research on Chemical Intermediates - In this work, a highly selective method is presented for the preconcentration of cadmium. The developed magnetic solid-phase extraction is based on the...     

St.-Petersburg Water Research and Control Center

The main steps of the organization and development of the Water Research and Control Center are described; information about the center’s equipment and the problems solved is presented.     

The Vatican museum and the organic natural products. The Raphael’s frescoes and the “Last Judgment” by Nicolò and Giovanni

Abstract

In the second half of the 90s, alongside the restoration works of the Quattrocentisti (fifteenth century painters) in the Sistine Chapel, it also carried out the restoration of the frescoes of the Stanze di Raffaello. The results of scientific investigations conducted by the Scientific Research Laboratory of the Vatican Museums, previously presented in some assays of study, are summarised and presented in this letter to the Editor for the special issue of Natural Product Research: Natural Products in Cultural Heritage.     

Neutron activation analysis at the research reactor center of IPEN/CNEN-SP- biological and environmental applications

The Research Reactor Center (CRPQ) of IPEN/CNEN-SP operates the IEA-R1 Research Reactor, at a nominal power of 2 MW thermal, on a 64 hour per week continuous cycle. The IEA-R1 is a pool type reactor, moderated and cooled by light water, with graphite as a reflector. One of the main activities of CRPQ is the neutron activation analysis, which is applied to many fields of research, in collaboration with other institutes and universities. The Research Reactor installations are also intensely used for human resources development in the field of radiochemistry and neutron activation analysis, at graduate and post-graduate levels. In the present paper, an overview will be presented of some of the neutron activation analysis research lines that are being developed, comprising environmental and health-related applications. This revised version was published online in August 2006 with corrections to the Cover Date.     

Adsorption/desorption of acid violet-7 onto magnetic MnO2 prior to its quantification by UV–visible spectroscopy: optimized by fractional factorial design

Research on Chemical Intermediates - A highly efficient magnetic adsorbent is presented to preconcentrate acid violet-7 (AV-7) prior quantifying by UV–visible spectroscopy...     

A Synthesis of Prostaglandins: Strategy and Reality

The prostaglandin synthesis developed in the Woodward Research Institute at Basel serves to provide an unusual look behind the scenes. A candid account is presented of the sometimes tortuous chronological sequence of ideas and experiments during work on a challenging synthesis.     

Microcomputers and pattern recognition

Microcomputer software for chemists is becoming available at an ever increasing rate. Following Professor Forina's general pattern recognition program, published in last month's Computer Corner, we present a specific technique, the linear learning machine. This is also available in Professor Forina's PARVUS but the software presented here has additional possibilities. It is proposed by Dr D.C. Leegwater from the Central Institute of Food and Nutrition Research of the Dutch organization of Applied Scientific Research (CIVO-TNO) at Zeist and by his son, who is studying physics and mathematics at the State University of Utrecht.     

Investigations of zoogenic protein adhesives used for domestic aircraft engineering prior to 1930

An initial study of the adhesives in the Soviet Union aimed at the application of adhesives in air-craft engineering is presented. A general concept of the adhesives in 1920 is given, the assortment of the zoogenic protein adhesives is presented, and the manufacturing procedure of the latter is outlined. Detailed information on the results of the first scientific-research works in the country in the field of the adhesives carried out at the Department of the Research of the Aircraft Materials of the Central Aerohydrodynamic Institute (TsAGI) is presented. It has been found that the fundamental study of the adhesives in our country arose due to the development of domestic wooden aviation and the manufacturing of airplanes from wood.     

Investigations of protein casein adhesives in 1927–1934 in research works of Central Aerohydrodynamic Institute and All-Russia Institute of the Aircraft Materials

An initial study of the adhesives in the Soviet Union aimed at the application of adhesives in air-craft engineering is presented. A general concept of the adhesives in 1920 is given, the assortment of the zoogenic protein adhesives is presented, and the manufacturing procedure of the latter is outlined. Detailed information on the results of the first scientific-research works in the country in the field of the adhesives carried out at the Department of the Research of the Aircraft Materials of the Central Aerohydrodynamic Institute (TsAGI) is presented. It has been found that the fundamental study of the adhesives in our country arose due to the development of domestic wooden aviation and the manufacturing of airplanes from wood.     

Unrestricted Hartree-Fock instabilities in nuclear spin-spin coupling calculations. The MNDO method

The MNDO wavefunction is used to calculate the Fermi contact term of nuclear spin-spin coupling constants. Owing to the presence of non-singlet unrestricted Hartree-Fock instabilities of the wavefunction, convergence problems arise in a rather large set of molecules, especially those containing molecular orbitals. A special technique to cope with this situation is presented. The MNDO and transmitted components of the coupling constants in the ethylene molecule are also calculated and compared with those previously obtained with the INDO and INDO/S methods.Part of a Ph.D. thesis (G.E.S.) to be presented to the University of Buenos Aires.Commission of Scientific Research (CIC, Pcia. Bs. As.) fellow.Argentine National Research Council (CONICET) fellow.Member of the Argentine National Research Council (CONICET).     

Analytical chemistry department at Giredmet is 75

The history and current status of analytical service at the Giredmet State Research and Design Institute of Rare-Metal Industry is briefly considered. The main steps in the development of analytical laboratories at the institute are described and the data on the most important works and their authors are presented.     

Applying Fe3O4-MoS2-chitosan nanocomposite to preconcentrate heavy metals from dairy products prior quantifying by FAAS

Research on Chemical Intermediates - A magnetic solid phase extraction method is presented to preconcentrate Pb(II), Cd(II), Ni(II) and Zn(II) simultaneously. The adsorbent (mMoS2-CS), consisting...     

Reactive adhesives on the basis of (meth)acrylic oligomers

A review of works carried out at the Academician V.A. Kargin Research Institute of Polymers and literature data on applications and properties of anaerobic, UV-, and thermo-curable, aerobic and modified acrylic adhesives is presented. The primary attention is paid to the possibility of preparation of thermally stable adhesive acrylic materials, modifying an oligomeric backbone and using viscosifiers and additives. Data on the use of efficient stabilizers and curing accelerators are presented. Curing mechanisms of acrylic adhesives are considered.     

Green synthesis of nano-titania (TiO2 NPs) utilizing aqueous Eucalyptus globulus leaf extract: applications in the synthesis of 4H-pyran derivatives

Research on Chemical Intermediates - We have presented the green synthesis and characterization of nano-titania (TiO2 NPs) by using Eucalyptus globulus leaf aqueous extract in a greener approach...     

Catalytic synthesis of coumarin-linked nicotinonitrile derivatives via a cooperative vinylogous anomeric-based oxidation

Research on Chemical Intermediates - In the presented study, we developed a new and efficient strategy for the synthesis of coumarin-linked nicotinonitrile derivatives via a cooperative vinylogous...     

The use of inductively coupled plasma mass spectrometry in the production of environmental certified reference materials

The use of inductively coupled plasma mass spectrometry (ICP-MS) in the production of environmental certified reference materials by the National Research Council of Canada is reviewed. Particular emphasis is placed on the use of isotope dilution ICP-MS. Results for fresh and saline natural waters, fish tissues and sediments are presented to illustrate the impressive capabilities of this technique.     

Catalytic application of a nano-molten salt catalyst in the synthesis of biological naphthoquinone-based compounds

Research on Chemical Intermediates - In this investigation, a new application of 1H-imidazol-3-ium tricyanomethanide catalyst was explored. The catalyst presented a robust catalytic applicability...     

Fast-neutron analysis at the Swedish Defence Research Agency

A fast-neutron analysis (FNA) system is being developed at the Swedish Defence Research Agency. The experimental set up, consisting of a SODERN Genie 16 (D-T) 14 MeV neutron generator, a HPGe-detector, a neutron monitor detector and related electronics, is described in some detail. Results from preliminary measurements on bulk samples containing mainly carbon and nitrogen are presented. Finally future objectives are discussed.