Study of adsorption of the SARS-CoV-2 virus spike protein by vibrational spectroscopy using terahertz metamaterials

Adhesion of the spike protein of the SARS-CoV-2 virus is studied by vibrational spectroscopy using terahertz metamaterials. The features of metastructure absorption upon the deposition of histidine, albumin, and the receptor-binding domain of the spike protein films are investigated. An original technique for quantitative assessment of the efficiency of virus adhesion on the metamaterial surfaces are proposed and experimentally tested.

Total laparoscopic hysterectomy

Basing on the experience of more than 650 total laparoscopic hysterectomies (TLH) performed by original technique, the authors express their own view of efficacy and safety of laparoscopic uterectomy. Detailed description of intrafascial TLH technique is drawn in the article.

Development of an original method for the repair of paracolostomy hernias

The proposed surgical procedure was studied on six unfixed male human cadavers. The removal of the end colostomy and paracolostomy hernia with subsequent intra-abdominal implantation of a previously prepared hernioprosthesis from the xenopericardium were modeled on the corpses. The use of the proposed method for the repair of paracolostomy hernias, including the use of a xenopericardial plate as an endoprosthesis according to an original technique, has shown its consistency and prospects for use on clinical material. Further studies associated with the use of the proposed technique of paracolostomy hernia repair in clinical practice seem promising. Key words: Colostomy, paracolostomy hernia, implantation, hernioprosthesis, xenopericardium.

Comprehensive assessment of hemorrhoidectomy with lateral ultrasonic dissection in the “cut” mode

The effectiveness of the original technique of hemorrhoidectomy with lateral ultrasonic dissection in the cutting mode was analyzed from a clinical standpoint and studied according to pathomorphological changes in tissues during its use. A comparative assessment of the immediate results of treatment as well as pathomorphological changes in the tissue of removed hemorrhoids in two groups of patients was performed. The main group included 30 patients in whom the original hemorrhoidectomy technique with lateral ultrasound dissection in the cutting mode was used. The control group consisted of 30 patients who underwent Milligan Morgan hemorrhoidectomy using electrocoagulation. No significant difference was found between these groups in terms of the age and sex structure of patients, as well as the main clinical characteristics of the disease. In a comparative analysis of the immediate treatment results, the intensity of the pain syndrome and the incidence of postoperative complications were lower in the main group than in the control group. In the assessment of pathomorphological changes, the depth of coagulation necrosis and the severity of necrobiotic changes in the underlying layer after hemorrhoidectomy with lateral ultrasonic dissection in the cutting mode were significantly less than those after Milligan Morgan surgery using electrocoagulation. A significant difference was also revealed in the timing of tissue regeneration. The formation of active granulations in the postoperative wound area in the main group was noted on postoperative days 1416, while this process developed no earlier than on postoperative day 20 in the control group. As a result, complete epithelialization of wounds after hemorrhoidectomy with lateral ultrasound dissection in the cutting mode occurred much earlier, i.e., postoperative days 2630. A similar process after the Milligan Morgan hemorrhoidectomy using monopolar coagulation was completed only on postoperative days 3638. Thus, the use of the original technique of lateral ultrasound dissection provides a more sparing effect on tissues, which is the key to a favorable course of the postoperative period and rapid rehabilitation of patients.

Terahertz Absorber with Graphene Enhanced Polymer Hemispheres Array

We propose an original technique for the fabrication of terahertz (THz) metasurfaces comprising a 3D printed regular array of polymer hemispheres covered with a thin conductive layer. We demonstrate that the deposition of a thin metal layer onto polymer hemispheres suppresses the THz reflectivity to almost zero, while the frequency range of such a suppression can be considerably broadened by enhancing the structure with graphene. Scaling up of the proposed technique makes it possible to tailor the electromagnetic responses of metasurfaces and allows for the fabrication of various components of THz photonics.

To the technique of salpingostomatoplasty. Heimann (Zentr. F. Gyn., 1926, no. 28)

Heimann (Zentr. F. Gyn., 1926, No. 28) defends the original technique of this operation in the form proposed by Martin, that is, the dissection of the abdominal end of the tube, followed by suturing the tubal mucosa with the peritoneum with thin sutures.

An Enhanced Dynamic Signature Verification using the X and Y Histogram Features

Dynamic signature verification by using histogram features is a well-known signature forgery detection technique due to its high performance. However, this technique is often limited to angular histograms derived from vectors containing two adjacent points. We propose additional new features from the X and Y histograms to overcome the limitation. Our experiments indicate that our technique produced Under Curve Area AUC values 0.80 to detect skilled forgery and 0.91 for random forgery. Our method performed best when the verification system uses 12 of the most dominant features. This setup produced AUC values of 0.80 to detect skilled forgery and 0.93 for random forgery. These results outperformed the original technique when the X and Y histogram features are not used that produced AUC values of 0.78 to detect skilled forgery and 0.90 for random forgery.