[en] The standard molar dissolution enthalpies of metallic orthoperiodates hydrates salts of the type, M₂HIO₆·nH₂O (M=Cu²⁺, Zn²⁺, Cd²⁺; n=2, 1.25, 1.25), in aqueous 3 mol dm^-3 HNO₃ have been measured by using an isoperibolic calorimeter at 298.2 K. The thermodynamic parameters of these compounds, e.g. Δ_dissG deg. _m and Δ_dissS deg. _m, have been calculated or estimated. The related values published in the literature and that were obtained from solubility determinations using a spectrophotometer in the 298.5-328 K temperature range have been also revised by using a linear regression analysis

[en] Two types of periodically modulated field for high voltage accelerating tubes are presented. The trajectories of secondary electrons emitted from electrodes have been computed. It is shown that the maximum energy obtained by the electrons decreases with the increasing field modulation. Therefore, it is possible to suppress the electron loading effect of high voltage accelerating tubes by these means

[en] A gridded ionization chamber with a drift length of 4.5 cm and a total volume of 3.5 l, was operated with high-purity liquid xenon and extensively tested with γ-rays from ¹³⁷Cs, ²²Na and ⁶⁰Co radioactive sources. An electron lifetime in excess of 1 ms was inferred from two independent measurements. The electric field dependence of the collected charge and energy resolution was studied in the range 0.1-4 kV/cm, for different γ-ray energies. With an electric field of 4 kV/cm, the spectral performance of the detector is consistent with an energy resolution of 5.9% at 1 MeV, scaling with energy as E^-0.5. The chamber was also used to detect the primary scintillation light produced by γ-ray interactions in liquid xenon. The light signal was successfully used to trigger the acquisition of the charge signal with a FADC readout. A trigger efficiency of ∼85% was measured at 662 keV

[en] Highlights: • Released roxarsone (ROX) readily photolyzed into iAs"I"I"I/iAs"V bearing derivatives. • Clear cytotoxicity by ROX photodegradates but not by ROX in Tetrahymena cell. • As uptake in cell membrane by ROX exposure but in cytoplasm by ROX photodegradates. • Biomimetic membrane structure for assessing membrane permeability and cytotoxicity. • ROX photodegradates exposure associated intracellular 15 protein over expression. - Abstract: Roxarsone (ROX) remains to be as an organoarsenical feed additive used widely in developing countries. However, most of the ROX is excreted unchanged in manure, which could be readily photodegraded into inorganic arsenic derivatives. In this study, the comparative cytotoxicity and arsenic accumulation were evaluated after the exposure of Tetrahymenathermophila (T. thermophila) cell model to ROX and its photodegradates. The cytotoxic effects were estimated according to the relevant cell growth curves, morphologies and MTT assays. The 36 h median effective concentrations for ROX and its photodegradates at various photolysis times (10, 20, and 30 min) are 39.0, 2.08, 1.88, and 1.82 mg (total arsenic) L"−"1, respectively. In parallel, the cellular arsenic uptakes were determined by hydride generation-atomic fluorescence spectrometry. Phospholipid layer as basic membrane structure was mimicked to assess the correlation between membrane permeability and cytotoxicity. The biocompatibility of ROX was dependent on its tendency to interact with cell membrane while the cytotoxicity was induced by the trans-membrane of the inorganic arsenic species present in the photodegradates of ROX. Furthermore, the photodegradates of ROX-associated alterations of intracellular protein profiles were analyzed using a proteomic approach. Overall, the significance was clarified that the control of arsenic emission caused by the application of ROX needs to be imposed

[en] Highlights: • Relationship of solid solution structure and properties of ZrB_2–5WC was clarified. • The effect of crack deflection led to the increasing resistance of fracture. • The flexural strength of ZrB_2–5WC increased from room temperature to 1600 °C. • The flexural strength of ZrB_2 possessed the highest flexural strength at 1000 °C. - Abstract: ZrB_2 (ZB) and ZrB_2–5 vol.% WC (ZW) were prepared by hot-pressing at 2100 °C. Combining experimental and theoretical methods, the tungsten (W) element in solid solution with ZrB_2 and ZrC was investigated. Experimentally, solid solution formation in ZW samples was supported by XRD and EDS. Theoretically; atomic scale computer simulations based on density functional calculations were used to interpret the different amount of solid solution and the changes in lattice parameters. The flexural strength of the samples was measured from room temperature to 1600 °C. The flexural strength of ZB and ZW changed differently as testing temperature increased. Then, the strength of ZB increased from 344 ± 12 MPa to 1281 ± 39 MPa, which is about 3.7 times of room temperature strength. Further temperature increasing led to strength decreasing. While for ZW, the strength increased continuously from room temperature to 1600 °C. SEM and TEM techniques were employed to clarify the different mechanism of fracture surfaces and grain boundaries of ZB and ZW

[en] Five kinds of solid coordination complexes of uranium(VI) and thorium(IV) with the dinamide (N,N,N',N'-tetrabutylmalon-amide (TBMA), N,N,N',N'-tetrabutylsuccinylamide (TBSA), N,N,N',N'-tetrabutylglutaramide (TBGA), N,N,N',N'-tetrabutyl-adipicamide (TBAA)) were synthesized. All these complexes of UO₂(NO₃)₂ x TBMA, UO₂(NO₃)₂ x TBSA, [UO₂(NO₃)₂ x (TBGA^1/2)₂]_x, UO₂(NO₃)₂ x TBAA and Th(NO₃)₄ x 2TBMA were characterized by elemental analysis, UV spectra, IR spectra and ¹³C NMR spectra. The coordination form and proposed structures of the complexes are also discussed. (author)

[en] This paper introduces the study on effect of insecticide and sterilization of SAK by ⁶⁰Co γ irradiation. The results declare that the proper dose kill the insect eggs on the surface of SAK is 3.5 kGy, the preserving period under ambient temperature is up to 7 months, the intactness rate is 100%, and the SAK can be safely stored through the summer. By the irradiation of 3.5 kGy, the sanitary quality of SAK can be notably improved and the amount of microbes can decrease by at least 99%. There are no remarkable changes of the main nutrition components of irradiated SAK

[en] Objective: To evaluate the effect and mechanism of down-regulating the expression of REV7 on the radiosensitivity of human colon cancer cell HCT116. Methods: HCT116 cells were cultured and the expression of REV7 was down-regulated by RNA interference technique. HCT116 cells were divided into the blank group, negative control transfected with negative RNA oligo group and REV7 expression down-regulation transfected with REV7 RNA oligo group, respectively. The cell proliferation was determined by colony formation assay. The expression levels of the proteins of relevant genes were detected by Western blot. The level of cell apoptosis and non-homologous end joining was evaluated. Results: The colony formation rate was significantly reduced in THE REV7 siRNA group after 6 Gy irradiation (P < 0.05). The down-regulating efficiency rate of REV7 gene was > 60% in the REV7 siRNA group. The expression levels of γ H₂AX and Caspase 9 were significantly up-regulated, whereas those of KU80 and XRCC4 were remarkably down-regulated in the REV7 siRNA group (all P < 0.05). Conclusions: The radiosensitivity of human colon cancer cell HCT116 can be increased by down-regulating the expression of REV7. The underlying mechanism may be related to the lower incidence rate of non-homologous end joining. (authors)

[en] This review describes the application of nuclear technology in Xinjiang agriculture along with industrialization and economic benefit since 1970s. Current problems in this field were analyzed and corresponding advices were presented. (authors)

[en] Objective: To assess the clinical value of ⁹⁹Tc^m(V)-Dmsa imaging in detecting the ovarian and the pelvic cavity neoplasms. Methods: ⁹⁹Tc^m(V)-DMSA imaging was performed on 24 patients with diagnosed ovarian neoplasms which were pathologically confirmed after operation. Results: 14 of the 15 patients with malignant ovarian tumors had positive ⁹⁹Tc^m(V)-DMSA scintigraphy. However, 7 of 9 cases with benign ovarian tumors had negative ⁹⁹Tc^m(V)-DMSA scintigraphy. The sensitivity, specificity, positive predictive value, negative predictive value, false positive rate, false negative rate, and accuracy of ⁹⁹Tc^m(V)-DMSA imaging for detecting malignant ovarian tumors were 93.33%, 77.78%, 87.50%, 87.50%, 14.29%, 6.67% and 87.50%, respectively. Conclusions: ⁹⁹Tc^m(V)-DMSA imaging is of important value in detecting malignant and benign ovarian and pelvic tumors