Уровенный режим подземных вод нижнего течения реки Тобол

Объектом исследования является подземные воды верхнего гидрогеологического этажа Западно-Сибирского артезианского бассейна, приуроченные к водоносным отложениям четвертичного, олигоценового и нижнеэоценового возраста. Цель работы: изучение уровенного режима подземных вод нижнего течения реки Тобол.The object of the study is the groundwater of the upper hydrogeological floor of the West Siberian artesian basin, confined to aquifers of the Quaternary, Oligocene and Lower Eocene age. Objective: to study the level regime of groundwater in the lower reaches of the Tobol River

Structure of the 30S ribosomal decoding complex at ambient temperature

The ribosome translates nucleotide sequences of messenger RNA to proteins through selection of cognate transfer RNA according to the genetic code. To date, structural studies of ribosomal decoding complexes yielding high-resolution data have predominantly relied on experiments performed at cryogenic temperatures. New light sources like the X-ray free electron laser (XFEL) have enabled data collection from macromolecular crystals at ambient temperature. Here, we report an X-ray crystal structure of the Therm us thermophilus 30S ribosomal subunit decoding complex to 3.45 angstrom resolution using data obtained at ambient temperature at the Linac Coherent Light Source (LCLS). We find that this ambient-temperature structure is largely consistent with existing cryogenic-temperature crystal structures, with key residues of the decoding complex exhibiting similar conformations, including adenosine residues 1492 and 1493. Minor variations were observed, namely an alternate conformation of cytosine 1397 near the mRNA channel and the A-site. Our serial crystallography experiment illustrates the amenability of ribosomal microcrystals to routine structural studies at ambient temperature, thus overcoming a long-standing experimental limitation to structural studies of RNA and RNA-protein complexes at near-physiological temperatures

Calorimetric investigation of Al–Zn alloys using Oelsen method

The results of calorimetric study of binary Al-Zn system done according to the Oelsen thermodynamic method are presented in this paper. Main thermodynamic properties, including activities, activity coefficients, partial/integral molar Gibbs excess, and mixing energies were determined at 1,000 K. Positive deviation from Raoult law was noticed, with minimal values of Delta G (M) about -3 kJ mol(-1) and maximal values of Delta G (E) about +2 kJ mol(-1). The energetics of mixing in liquid Al-Zn alloys has been analyzed through the study of concentration fluctuation in the long-wavelength limit, and weak affinity between Al and Zn atoms in the system was observed. Differential thermal analysis and light optic microscopy were applied in the frame of characterization of investigated binary alloys and phase diagram examination, and the results obtained were in accordance with available literature data