Synergetic effect of temperature and pressure on energetic and structural characteristics of {ZIF-8 + water} molecular spring.

Metal-organic frameworks (MOFs) and particularly their subclass - Zeolite Imidazolate Frameworks (ZIFs) - are used for a variety of applications including particularly energy storage. Highly porous MOFs mixed with non-wetting liquids can be used to form molecular springs (MS) for efficient mechanical and thermal energy storage/transformation. In this paper by means of high-pressure calorimetry the energetic characteristics of {ZIF-8 + water} MS were investigated in wide temperature and pressure ranges. Unexpectedly XRD measurements show that the concomitant effects of temperature and pressure on {ZIF-8 + water} MS leads to an irreversible change of the ZIF-8 structure, transforming its symmetry from cubic to orthorhombic. Whereas, previous studies have demonstrated the stability of ZIF-8 under either high pressure or high temperature.

A new working mode for molecular springs: water intrusion induced by cooling and associated isobaric heat capacity change of a {ZIF-8 + water} system.

Hydrophobic microporous metal-organic framework ZIF-8 combined with water forms a molecular spring (MS), which by the forced intrusion of water into the pores and its spontaneous extrusion can store and restore large amounts of mechanical and thermal energy. Using scanning transitiometry technique, we demonstrate that the simultaneous effect of temperature and pressure on the porosity of ZIF-8 leads to a non-standard temperature dependence of intrusion and extrusion pressures of MS, which allows to provoke water intrusion into the hydrophobic pores of ZIF-8 by decreasing the temperature of the system under constant pressure. A remarkably strong effect of intrusion on the isobaric heat-capacity of {ZIF-8 + water} MS is discovered.

[The effect of ecoestrogens on the development of the mammalian reproductive system]. / Vliianie ékoéstrogenov na razvitie reproduktivnoi sistemy mlekopitaiushchikh.

Recently, it has been shown that the environment contains a large variety of chemical substances possessing estrogenic activity (ecoestrogens/environmental estrogens). In this connection, the problem of estrogenic effects exerted by the environment on animal ontogenesis is very important. Here, we review that available data concerning the effects of ecoestrogens on the development of the reproductive system in mammals. We discuss issues of reproductive toxicology related to the effects of these substances during prenatal and postnatal development, with special attention to the effect of ecoestrogens and modern reproductive technologies on preimplantation embryonic development.

[Nutrition and the incidence of ischemic heart disease and risk factor for its occurrence among men 20-59 years of age depending on their ethnic group affiliation]. / Pitanie rasprostrannost' i ishemicheskoi bolezni serdtsa i faktorov riska ee vozniknoveniia sredi muzhchin 20-59 let v zavisimosti ot ikh étnicheskoi prinadlezhnosti.

The epidemiological investigation of males aged 20-59 years, conducted in Frunze, has shown a rather high incidence rate of coronary heart disease (CHD) and its risk factors among them, the nutrition being related with the incidence of CHD and its risk factors. The character of nutrition is distinctly associated with differences in the incidence of hypercholesterolemia and hypertriglyceridemia among the indigenous and nonindigenous population.

[Circadian rhythm of blood acetylcholinesterase after administration of organophosphate compounds during hypokinesia]. / Sutochnaia ritmika atsetilkholinésterazy krovi pri vozdeistvii fosfororganicheskogo soedineniia pri gipokinezii.

Circadian and ultradian rhythms of blood acetylcholinesterase (ACE) and rectal temperature were investigated during hypokinesia and administration of a toxic organic phosphate compound in various doses. Hypokinesia was found to produce a strong desynchronizing effect on ACE and thermal regulation. It is maintained that the use of chemicals with a well documented mechanism of action may yield reliable information about biorhythm restructuring in response to exogenous effects. It is emphasized that biorhythm changes should be taken into consideration when arranging work schedules in hypokinetic conditions.

[Prediction of foci of Crimean hemorrhagic fever by means of a computer]. / O prognozirovanii ochagov Krymskoi gemorragicheskoi likhoradki pri pomoshchi elektronnovychislitel'noi mashiny

Districts of the Osh region were classified by a number of signs with the aid of a computer for the purpose of epidemiological prognosis of the foci of Crimean hemorrhagic fever (CHF). The results obtained were compared with the data of virological study for CHF in these districts. This work showed that there were future prospects in using the computer program for prognostication of infections with natural nidality with the aid of a computer.