The article presents results of evaluation of a priori and a posteriori occupational risks for workers engaged into underground mining. Evidence is that work conditions of major occupational groups ...of workers engaged into underground mining, according to workplace certification, correspond to 3 class 3 jeopardy degree. A priori risk of diseases development corresponds to high (unbearable). Evaluation of cause-effect relationship between health disorders and work conditions revealed a medium degree of occupational conditionality for vascular regulation disorders and metabolic disorders, that can be considered as cardiorisk indicators.
As are other parts of the earth, aretic and subarctic territories are influenced by global, regional, and local air pollution. In Europe, the greatest load of airborne contaminants is observed in ...terrestrial ecosystems of the Kola Peninsula; in Asia, the greatest load is found in ecosystems of the Taimyr Peninsula, where large copper-nickel smelters are functioning. The studies described here for these regions encompassed local and regional deposition of pollutants (mainly sulfates and trace metals); changes in the composition, structure, productivity, and status of forest vegetation; morphological reactions of plant species and their regenerative activity; reforestation processes; successions; element composition of plants and soils; and biological activity of soils. The key findings of long-term studies are as follows. First, the symptoms of plant damage by air and soil pollutants in arctic and temperate zones are the same. Second, plants weakened by natural stresses have lower thresholds of sensitivity to airborn pollutants. Third, rapid destruction of northern plant communities by pollutants is often connected with a wide distribution of sensitive species (e.g., lichens) and previously weakened plants. Fourth, the specific structure of far northern forest and tundra ecosystems (in particular, open canopy and/or thin photosynthetic layer) and the severe climate produce some peculiarities in plant damage, namely (1) a large difference in the rate and intensity of damage to upper and lower parts of plants if the green parts are above or under snow in the winter, (2) simultaneous damage of different parts of stands that are above snow cover, and (3) an increase in the krummholz effect (stunted, low-lying branches) for evergreen coniferous trees. These findings were obtained for conditions of evident airborne contamination. The impact of low level regional pollutants on arctic and subartic vegetation is not sufficiently understood.
Forming a community at risk for circulatory system diseases will increase efficiency of medical and prophylactic measures on managing risk of arterial hypertension. Epidemiologic analysis helped to ...reveal reliable connection between arterial hypertension predictors and work conditions of mining machine operators and supported actualization of high occupational risk suggested in a priori evaluation. Mathematic modelling helped to forecast increase in the disease probability: with noise level of 94 dB after 10 years of work, 17.9% of workers are expected to have arterial hypertension preventing from further occupational activity. Forecasting results of arterial hypertension probability help to form risk groups for medical and preventive technologies managing occupational risk, and predictors enable to specify necessity of individual medical preventive measures.
Three new O,N-coordinated nickel (II) complexes, namely, Ni(dmpda(acac)2) (1), Ni(pda)(acac)2 (2) and Ni(pda)(tfac)2 (3) have been synthesized ((dmpda(acac)2 – ...N,N′-(2,2-dimethyl-1,3-diaminopropane)-bis-(2,4-pentanedioniminoato(2-), acac – 2,4-pentanedionato(−), pda – 1,3-diaminopropane, tfac – 1,1,1-trifluoroacetylacetonato(−)) and tested as new precursors for metal–organic chemical vapor deposition (MOCVD). The structures of 1–3 were determined by single-crystal X-ray diffraction (XRD) and further characterized by IR and Raman spectroscopies. All three compounds crystallize in the triclinic space group P1¯ with unit cell parameters of a = 9.0294(6), b = 9.2879(6), c = 10.4065(6) Å, α = 74.855(3), β = 68.717(3), γ = 78.708(3) for 1; a = 7.6947(2), b = 10.3087(3), c = 10.7144(3) Å, α = 101.784(1), β = 95.367 (1), γ = 106.134(1) for 2; and a = 7.8931(5), b = 10.8803(8), c = 10.9438(7) Å, α = 103.283(2), β = 97.070(3), γ = 103.050(2) for 3. The density functional theory (B3LYP) quantum chemical calculations have been used for detailed assignment of all intense bands in the vibrational spectra of the compounds studied. Thermal gravimetric analysis (TG/DTA) has shown that the species 1 and 3 sublime almost without decomposition, and 2 decomposes to some extent. MOCVD test experiments were carried out at low pressure (10 Torr) using 1 and 3 as precursors on Ta/Si substrates. The films have been characterized by X-ray powder diffraction, scanning electron microscopy, and energy dispersive spectroscopy were found to be primarily composed either of fcc-Ni or Ni3C phases. The phase composition of the films strongly depends on the MOCVD conditions.
Three Ni(II) complexes have been synthesized for the first time. Two compounds turned out to be suitable for MOCVD applications. The single-phase fcc-Ni films can be deposited on Ta/Si substrates. The obtained data are useful for further optimization of deposition conditions of fcc-Ni films with required composition and morphology. Display omitted
•We synthesized the Ni(II) complexes with coordination number 4 and 6.•We modified the synthetic technique of Schiff base Ni complex.•The structures and thermal properties of complexes were investigated.•Two Ni chelates were tested in MOCVD process.•The Ni and Ni3C films were deposited from these complexes.
The simultaneous photometric and interferometric measurements for five events of stable middle latitudinal red arcs (SAR-arcs) at station Maimaga (F∼63°, L∼129° are geographic coordinates, F
c∼56.5°, ...L
c∼200° are geomagnetic ones) are presented. The spatial position and intensity of SAR-arcs were monitored by a meridional scanning photometer. The neutral component temperature was recorded with the help of the Fabry-Perot interferometer, having the field of view of 2° and directed at the zenith angle of 10° southward; the exposure time varied from 15 to 30 min. The results have shown that temperature rise in arc correlates with the total intensity maximum in the arc. The temperature in the arc increases 1–2 hours after the increase in 630.0 nm emission intensity, caused by nonstationary magnetic disturbances (substorm activity), thus indicating a relationship between the temperature and ionospheric heating in the region of SAR-arcs.
It is shown that in the A431 cells, EGFR is co-immunoprecipitated with a group of proteins recognized by antibodies to phospholipase Cγ. These are 145- and 47-kDa proteins corresponding to ...phospholipase Cγ and Nck, respectively, and an unidentified 66-kDa protein. The association of phosphoinositide-specific phospholipase Cγ and 66-kDa protein to EGFR was observed in the A431 cells with or without the EGF treatment. Trypsin peptide maps of these two proteins are similar so it is assumed that the 66-kDa protein is related to phospholipase Cγ.
Satellite and ground-based measurements of the SAR-Arc phenomena Afonin, V.V.; Alexeyev, V.N.; Ivenko, I.B. ...
Physics and chemistry of the earth. Part C, Solar-terrestrial and planetary science,
2000, 2000-1-00, 20000101, Letnik:
25, Številka:
1-2
Journal Article
Recenzirano
Data of the Intercosmos 24 (IC 24) satellite and the ground based complex optical and ionospheric measurements in the region of the stable auroral red (SAR)-arc are presented. Photometric ...observations were carried out at the Maimaga station (invariant latitude Λ =56.5°, geomagnetic longitude λm=200°) and vertical incidence ionospheric soundings were made at Yakutsk (Λ =55.°, λm=200°) and Zhigansk (Λ=60.4°, λm=195°) stations. It is shown that when SAR-arc arises for the interval ∼ 15 min, the local minimum of the F-region electron density is formed, and in the ionograms typical signatures of the polarization jet or SAID are observed. Simultaneously, the height of the regular F2 layer increases. This evidences that strong electric field (E ∼ 100 mV/m) exists at the F2 layer heights. In this case, in addition to the SAR-arc energy sources, the effect of the ion-frictional heating is turned out to be important. Simultaneous measurements aboard the IC-24 satellite at the altitudes ∼500 km above the SAR-arc also show 3/5 times decreased electron density.. The electron temperature elevates up to ∼ 4500 K. At altitudes of 2400 km the ion density increases by 30 – 40% and Te rises up to 6300 K.
At
T
= 150 K, the crystal structures of Pd(En)
2
(ReO
4
)
2
, Pd(En)
2
(NO
3
)
2
, and PdL
2
(ReO
4
)
2
(L is N,N′-diisopropylideneethane-1,2-diamine) are studied. Crystal chemical analysis is ...performed, and the main factors affecting the packing of fragments in these structures are determined.
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