The effects of composite fibroin-gelatin microparticles (100-250 μ) on the rate of wound healing and regeneration under conditions of contraction prevention were studied on the model of splinted ...full-thickness skin wound in a mouse. Subcutaneous injection of these particles into the defect area accelerated wound healing and promoted re-epithelialization and recovery of normal structure of the epidermis. In addition, the composite microparticles promoted the formation of connective tissue of characteristic structure, replacing the derma over the entire defect, and stimulated regeneration of subcutaneous muscle (panniculus carnosus) and skin appendages (sebaceous glands and hair follicles).
The efficiency of briquetting kaolin raw material in a roller press is investigated as a measure for combatting dust formation during clay firing. It is established that use of a roller press for ...briquetting with a claw-grooved configuration of molding elements compared with extrusion by a vacuum press makes it possible to prepare briquettes of better quality, distinguished by improved breakage resistance during heat treatment. A rational clay moisture content is determined for briquetting in a roller press (21%). It is established that briquette preparation with this moisture content makes it possible to minimize briquette breakage during heat treatment and energy expended in material drying before compaction, and also to increase the yield of finished briquettes from a press with provision of good crude briquette strength.
The cross section of the process e + e − → π + π − has been measured in the center-of-mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at the electron-positron collider VEPP-2000. The ...measurement is based on an integrated luminosity of about 88 pb − 1 , of which 62 pb − 1 represent a complete dataset collected by CMD-3 at center-of-mass energies below 1 GeV. In the dominant region near the ρ resonance a systematic uncertainty of 0.7% was achieved. The implications of the presented results for the evaluation of the hadronic contribution to the anomalous magnetic moment of the muon are discussed. Published by the American Physical Society 2024
The linear regression analysis was used to perform a comparative assessment of the mathematical description of the experimental compaction curves by the new basic equation and the empirical ...compaction equations proposed by Balshin, Heckel, Kawakita, Panelli–Filho, and Ge. The studies were conducted on a specially compiled representative sample of the mining and metallurgical complex materials, divided into groups in accordance with the technological purpose in metallurgical redistribution. According to the results, the basic compaction equation developed by the authors is characterized by the best indicators of reliability and accuracy, and therefore it is preferable for determining the energy–power characteristics of the compaction process under a pressure of up to 220 MPa. The validity of the interpretation of the constant coefficients of the compaction equations was also evaluated.
Recent Progress in the VEPP-2000 Collider Rastigeev, S. A.; Aktershev, Yu. S.; Bedarev, E. V. ...
Physics of particles and nuclei letters,
08/2023, Letnik:
20, Številka:
4
Journal Article
Recenzirano
The VEPP-2000 is an electron–positron collider with round beams built and operating at the Budker Institute of Nuclear Physics (BINP). The collider luminosity was increased twofold last year. The ...integrated luminosity accumulated over the last year has exceeded 0.3 fb
–1
, which almost doubled the total data collected since the collider operation began. The short description of the VEPP-2000 complex, current status, and the results are presented in this work.
We study some basic properties of the Dirichlet operator in weighted Lp spaces. We work under rather general assumptions on weights that destroy minimal local Sobolev regularity of the form domain.
The paper presents the experience of experimental determination of implanted medical devices heating value during an MR-study. This work is a part of the development of a comprehensive methodology ...for ensuring the safety of patients with metal structures. Objects of various shapes and materials were placed in a gel phantom, scanning was performed on an MR scanner with a static magnetic field of 1.5 T. It is shown that the temperature change in close proximity to the surface of a metal object can be within the permissible normative documentation limits or be negligible. The existing in Russia indications for magnetic resonance imaging (MRI) for patients with various metal objects should be reviewed.
A
bstract
The cross section of the process
e
+
e
−
→ ηπ
+
π
−
is measured using the data collected with the CMD-3 detector at the VEPP-2000 collider in the center-of-mass energy range from 1
.
1 to 2
....
0 GeV. The decay mode
η → γγ
is used for
η
meson reconstruction in the data sample corresponding to an integrated luminosity of 78
.
3 pb
−
1
. The energy dependence of the
e
+
e
−
→ ηπ
+
π
−
cross section is fitted within the framework of vector meson dominance in order to extract the Γ(
ρ
(1450)
→ e
+
e
−
)
B
(
ρ
(1450)
→ ηπ
+
π
−
) and the Γ(
ρ
(1700)
→ e
+
e
−
)
B
(
ρ
(1700)
→ ηπ
+
π
−
) products. Based on conservation of vector current, the analyzed data are used to test the relationship between the
e
+
e
−
→ ηπ
+
π
−
cross section and the spectral function in
τ
−
→ ηπ
−
π
0
ντ
decay. The
e
+
e
−
→ ηπ
+
π
−
cross section obtained with the CMD-3 detector is in good agreement with the previous measurements.
Morphological features of complicated gastroduodenal ulcers Osmanov, Z. H.; Rybakova, M. G.; Tikhonova, Yu. A. ...
Uchenye zapiski (Sankt-Peterburgskiĭ gosudarstvennyĭ medit͡s︡inskiĭ universitet im. akad. I.P. Pavlova),
07/2022, Letnik:
29, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The
objective
of the study was to evaluate structural changes in the margin of gastroduodenal ulcers complicated by perforation, bleeding or penetration in terms of the features of ulcer healing.
...Methods and materials
. Histological and IHC studies were performed on 25 patients of the main group with perforated gastroduodenal ulcers and 23 patients of the control group with chronic recurrent ulcers complicated by bleeding and penetration. Histological sections were stained with hematoxylin and eosin, and Van Gieson's picrofuchsin. Immunohistochemical reactions were performed with antibodies to Ki-67, CD68, CD138, and CD34.
Results
. On macroscopic evaluation, a clear even margin of the perforation was noted. Histological examination with the background of acute dyscirculatory changes clearly shows a zone of necrosis and a weakly expressed layer of granulation tissue, which in majority of the cases was practically absent. The margin of a perforated ulcer consists of a minimally presented, clearly delimited zone of tissue detritus and a practically unchanged muscle layer. Plasma cells dominated in the cell infiltrate, and the index of proliferative activity in the epithelium of the ulcer margins was about 45 %, distributed fairly evenly.
Conclusions
. Perforated ulcers can be considered as a special group of ulcers with the most pronounced changes of infiltration by plasmatic cells and eosinophils, edema and acute dyscirculatory changes, uniform and fairly high proliferative activity of the epithelium. Changes in the margins of the perforated ulcer allow for complete regeneration without excessive scarring with precise suturing of the perforation.
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