Delayed effects of chronic low-dose high linear energy transfer (LET) radiation on mice in vivo

In the present work, the delayed effects of chronic high linear energy transfer (LET) radiation in polychromatic erythrocytes (PCEs) of mice bone marrow were investigated in vivo. Irradiation of the two-month-old SHK white mongrel random-bred male mice was performed in the radiation field behind the concrete shield of the accelerator of 70 GeV protons to accumulate doses of 0.005-0.16 Gy. The dependence of the biological response on dose, adaptive response (AR) and genomic instability (GI) in F(1) and F(2) generations from males irradiated with doses of 0.005 and 0.16 Gy and from males exposed to combined action of immunomodulator-bendazol hydrochloride (BH) and of 0.16 Gy irradiation, were examined using the micronucleus formation test. The data demonstrated that irradiation of mice with these doses lead to an increase in the level of cytogenetic damage and induces no AR. With analysis of the bone marrow radiosensitivity to 1.5 Gy of X rays and the capacity to AR it was found that the chronic high-LET irradiation of parents induced the GI at least two generations. The combined exposure to BH and the dose of 0.16 Gy induces no AR in F(0) generation but induces AR in F(1) and F(2) offspring.     

Study of the thermal-oxidative stability of polybenzoheterocyclic binder

The results of investigating highly thermostable polymer matrices with softening temperatures of 400–450°C are reported. Binders based on a tetranitrile of an aromatic tetracarboxylic acid and bis(o-cyanoamine) are used as polymer matrices. Traditional antioxidants, such as aromatic amines, phenols, and alkyl aryl phosphites, cannot be applied as thermostabilizers. Detailed tests of an efficient stabilizer carborane-containing dinitrile were also unsuccessful because the initial period of retardation in the thermal-oxidative degradation is followed by irreversible changes in the polymer at 350–400°C. Only a new thermostabilizing system based on carborane-containing aromatic compounds with a set of conjugated bonds demonstrates a positive effect. It is established that the developed thermostabilizing system retards the thermal-oxidative degradation and makes it possible to obtain the polymer matrix with a thermal stability of 350–400°C.     

Composition and structure of thiacyclanes in oils of the Tadzhik depression

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 11, pp. 30–32, November, 1989.     

Processing Red Mud Produced at the Eti Alüminyum A.Ş. Seydişehir Alumina Refinery to Recover Gallium and Vanadium and Obtain Iron Oxide Pigments

Theoretical Foundations of Chemical Engineering - It is demonstrated that Bayer–hydrogarnet technology can be developed and applied to process red mud for separating important components such...     

Experience in introducing the “Ekolog-Shum” program

The results of introducing the “Ekolog-Shum” program are analyzed. The possibility of using this program for a health assessment of the noise level on the boundary of the sanitary-protected zone of energy complex enterprises is examined. Methods of solving the problems that appeared in using the program are proposed.