Sudebno-Meditsinskaya Ekspertisa最新文献

The aim of the scientific work is to analyze the prospects of using the impedance monitoring method to determine the prescription of death coming. The conducted exploratory analysis allows hypothesizing the dependence of impedance values and dispersion factors for the diagnostic zones studies on the postmortem interval; it also suggests that it is possible to determine this interval for the objects (pig corpses) studies with a combination of impedance values and the corresponding factors. Among large mammals, a swine is the closest to a human from the point of analyzing the postmortem period process, and it can be recommended as an adequate human corpse model. When determining the correlation between the postmortem interval and the impedance parameters, it is the simplicity and reproducibility of the method, the absence of expensive equipment, its portability and the rapid receipt of results that allow this method to be applied at the scene, reinforcing traditional forensic methods for determining the prescription of death coming. Interpretation of impedance monitoring results can be used to analyze the biological nature of the postmortem period processes.

Phenotypic signs of dominants isolated from the surface of bony remnants from the historic burial site were analyzed in order to expand data on the biodiversity of microorganisms in the microbial flora of bony remnants and to assess the possibility of using the results of microbiological analysis in the evidence base of forensic examination and forensic archaeology. It was detected that only Deuteromycota and Eubacteria colonized all types of surfaces in the samples of bone fragments from the historic burial site (with the age in the range of 90-95 years); with the abundance of micromycetes, the proportion of Eubacteria naturally decreased, while with the increased bacterial background counts the rate of micromycetes detection decreased. The insignificant amount of nutrients in the bony remnants led to the decrease in the number and biological diversity of microorganisms contaminating them; species adapted to a hard-to-reach organic substrate dominated there. During the process of bony remnants decomposition, when the conditions of their location changed, inter-species competition and specific recolonization occurred by species of microorganisms most adapted to a hard-to-reach organic substrate in the abiotic and biotic conditions of existence given. The results obtained are important for the descriptive ecology and biology of specific groups of microorganisms in the postmortem microbiome and form the basis for a more thorough study of complex communications between species of microorganisms in the necrobiome of bony remnants - in the future it will allow putting forward original hypotheses about the involvement of microbes in the circulation of matter and energy, as well as to apply the information obtained in the evidence base of forensic examination and forensic archaeology.

The aim of the study: Was to establish a pattern of femur diaphysis fracture with impact force over the entire front surface in an increments of 25 mm. Transverse, oblique and comminuted femur fractures were studied as a result of mathematical modeling. The application of mathematical modeling using the finite element analysis made it possible to visualize and predict the tension arising in the transient material during the impact force of blunt object, as well as the features of fractures' morphology in different sections of femur diaphysis. Modelled data about the mechanism and morphology of femur fracture were confirmed by the results of original full-scale experiments.

The biochemical approach for age assessment is most appropriate in forensic medicine, as racemization of aspartic acid in bones and teeth is closely related to human biological age. The aim of the study is to assess the biochemical parameters of aspartic acid in human teeth, which can be implemented into forensic practice in Russia. Samples of dentin in amount of 20, taken from the teeth of subjects aged between 16 and 76, were examined. Chromatographic analysis of the samples was performed on a gas chromatograph using chiral column. Statistical data processing showed that the relative squared peak of D-aspartic acid has a strong correlation with human biological age. Data, obtained from the Russian population study, demonstrate the applicability of chromatography for forensic purposes. It should be noted that the approach to the racemization rate estimation in the hard tooth tissue was performed using standard laboratory equipment, which allows to easily implement this method in forensic medical practice.

The purpose of this review is to study the causes of cross-reactions of a number of drugs (mebeverine, phenibut, tropicamide, ramipril, metoprolol, phenylephrine, sertraline, chloropyramine and diphenhydramine) during the preliminary stage of laboratory diagnostics by immunochromatographic method and to propose a possible algorithm for solving this problem. Conducting a hair study in order to identify the fact of the use of psychoactive substances will increase the reliability of analytical diagnostics and reduce the likelihood of false positive results of the analysis. The use of a validated method of enzymatic hydrolysis of hair will eliminate unreliable results of the analysis due to the detection of the native molecule of the toxicant, increase the efficiency and accuracy of the diagnostic procedure.

The aim of the study: Is to examine the applicability of IHC staining method with TGFβ1 antibodies for injuries vitality determination. 72 skin autopsy samples with mechanical injuries from 12 persons were divided to 3 groups (n=24 in each group): vital injuries, postmortal injuries, control non-injured samples. A routine histological examination using standard H&E stain and IHC with TGFβ1 antibodies was performed. We concluded the positive TGFβ1 staining was in keratinocytes in vitally injured skin and the negative one in postmortally injured and control non-injured samples. The role of TGFβ1 in the injuries healing process and the further examinations of the TGFβ1 staining method application for determination of injuries vitality are discussed.

The aim of the study: Is to investigate the lercadipine distribution in warm-blooded animals (rats). The experimental study used rats of Wistar race. TLC, GC-MS and UV-spectrophotometry methods were used for physical and chemical analysis. Semilethal (890 mg/kg) dose of lercadipine, previously suspended in water, was injected into stomach of laboratory animals. Examined substance was isolated from the thick tissues and animals' blood by acetone, cleaned with a change of solvent and macrocolumn chromatography using 30 µm «Silasorb S-18» sorbent and acetonitrile-water (8:2) polar eluent. The analyte was identified by chromatographic behavior in the thin sorbent layer, retention time and set of positive ions in its mass spectrum, as well as by UV-spectrum. The analyte was determined quantitatively in bioactive matrix using UV-spectrophotometry. The methods were validated by criteria of linearity, selectivity, accuracy, precision, detection limits and quantitative determination. The main content of lercanidipine (mg/100 g) was determined in the stomach content (198.183±29.541), the stomach (195.312±21.579), the small intestine (47.096±3.947), the spleen (38.952±3.532) and the liver (26.211±2.232).

Objective: To study the morphology of distribution of shot factors on white targets made of coarse calico at different distances.

Material and methods: The study was conducted on 57 experimental damages of targets made of cotton fabric, caused by shots from hunting self-loading Steyr Mannlicher AUG-Z3 carbine of.223 Rem caliber. The number of experimental firings equal 19 was done by 3 shots at the distance from close range to 250 cm. The examination of shot targets was carried out using the visual, metric, stereoscopic (Leica 125M microscope) methods, in ultraviolet rays (LUMATEC SUPERLITE M Series light).

Results: The nature and morphology of distribution of gunshot residue on targets' surfaces made it possible to establish close range firing zones. The nature in which soot is deposited during shot under the conditions of point-blank range and in the first zone of close range (up to 8 cm) allows to establish the position of weapon's transverse plane relative to the target basing on a specific blowout of a gas-powder jet from special design of flame arrestor. The performed experimental shooting from hunting self-loading Steyr Mannlicher AUG-Z3 carbine made it possible to determine the metric and morphological characteristics of the close range firing zones: 1 zone is equal a distance up to 8 cm; 2 zone - up to 30 cm; 3 zone - up to 100 cm from muzzle of weapon. The design features of Steyr Mannlicher AUG-Z3 carbine's flame arrestor allow to identify the type of weapon according to the morphological pattern of target's damage. The complex of obtained data makes it possible to determine the firing distance with high accuracy.

The aim of the study: Is to suggest the method of ricin determination in biological liquids during forensic medical and chemicotoxicological examination. This research describes the optimal conditions of sample processing of biological liquids, allowing to extract the components (ricinine and ricinoleic acid) of castor seeds. The recommended analysis conditions allow to perform research for 15 minutes by high resolution mass spectrometry method combined with high-value liquid chromatography on a chromato-mass spectrometer to detect ricinine and ricinoleic acid. The chromatographic (retention time) and mass-spectrometric parameters (mass spectra) were established for the exact high-quality determination of ricinine and ricinoleic acid.

The purpose of the work is to develop methods of mathematical modeling using finite element analysis in forensic medical examination. The stages of the methodology for solving problems of deformable body mechanics in forensic medicine are considered, which allows to reliably establish the possibility of formation and morphology of damage under specific conditions and circumstances, to focus the researcher's attention on problem points when creating and evaluating the model. The use of simplified models of the human body makes the expert's conclusion more reasonable, which increases the confidence of law enforcement agencies in the activities of the forensic medical expert service and allows for a new look at solving the problems of forensic medicine and forensic medical examination.