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1.
Angew Chem Int Ed Engl ; 59(14): 5756-5764, 2020 Mar 27.
Artigo em Inglês | MEDLINE | ID: mdl-31860759

RESUMO

Magnetic hysteresis is demonstrated for monolayers of the single-molecule magnet (SMM) Dy2 ScN@C80 deposited on Au(111), Ag(100), and MgO|Ag(100) surfaces by vacuum sublimation. The topography and electronic structure of Dy2 ScN@C80 adsorbed on Au(111) were studied by STM. X-ray magnetic CD studies show that the Dy2 ScN@C80 monolayers exhibit similarly broad magnetic hysteresis independent on the substrate used, but the orientation of the Dy2 ScN cluster depends strongly on the surface. DFT calculations show that the extent of the electronic interaction of the fullerene molecules with the surface is increasing dramatically from MgO to Au(111) and Ag(100). However, the charge redistribution at the fullerene-surface interface is fully absorbed by the carbon cage, leaving the state of the endohedral cluster intact. This Faraday cage effect of the fullerene preserves the magnetic bistability of fullerene-SMMs on conducting substrates and facilitates their application in molecular spintronics.

2.
Cent European J Urol ; 72(3): 247-251, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31720025

RESUMO

Introduction: The use of computer navigation systems is a new and actively explored method used for surgical procedures concerning the abdominal and retroperitoneal organs. In this paper, we propose an original hardware - software complex, which forms a virtual body model, based on preoperative computer tomography data, transmitted to the operating screen monitor using a surgical navigation system, involving a mechanical digitizer. Material and methods: During a laparoscopic procedure, a three-dimensional (3D) model of a kidney with a tumor was used to obtain additional information on the primary or secondary monitor or for combining the virtual model and video images on the main or additional monitor in the operating room. This method was used for laparoscopic partial nephrectomy, where twelve patients were operated with an average age of 45.4 (38-54) years, with clear cell renal cell carcinoma size 27.08 (15-40) mm. Results: All patients successfully underwent laparoscopic partial nephrectomy with intraoperative navigation. The mean operative time was 97.2 (80-155) minutes, warm ischemia time - 18.0 (12-25) minutes. Selective clamping of segmental renal arteries was performed in 7 (58.3%) cases, in the remaining 5 (41.6%) cases the renal artery was clamped. There were no serious complications. The average duration of hospital stay was 7.0 (5-10) days. Conclusions: Preliminary results of our clinical study have shown the success of 3D modeling for qualitative visualization of kidney tumors in the course of surgical intervention, both for the surgeon and for the patient to understand the nature of the pathological process.

3.
Chem Commun (Camb) ; 55(93): 13963-13966, 2019 Nov 19.
Artigo em Inglês | MEDLINE | ID: mdl-31686083

RESUMO

The hunt for high-performance single-molecule magnets (SMM) revealed that atomic and molecular lanthanide systems combining 4f-shell and valence magnetism (FV-magnetism) may show magnetic bistability up to unexpectedly high temperatures. Here we rationalize the stability of the magnetism in the FV-systems from first principles on the example of LnII(CpiPr5)2 molecules.

4.
Phys Chem Chem Phys ; 21(16): 8197-8200, 2019 Apr 17.
Artigo em Inglês | MEDLINE | ID: mdl-30816387

RESUMO

The ordering of endohedral clusterfullerenes Sc3N@C80 and YSc2N@C80 co-crystallized with Ni(OEP) and isolated complexes with Ni(OEP) have been investigated theoretically. Having used multiple orientations of M3N clusters inside the cages with Fibonacci sampling, we describe the effect of intermolecular interactions on the orientation of the endohedral cluster.

5.
Angew Chem Int Ed Engl ; 58(18): 5891-5896, 2019 Apr 23.
Artigo em Inglês | MEDLINE | ID: mdl-30786125

RESUMO

The azafullerene Tb2 @C79 N is found to be a single-molecule magnet with a high 100-s blocking temperature of magnetization of 24 K and large coercivity. Tb magnetic moments with an easy-axis single-ion magnetic anisotropy are strongly coupled by the unpaired spin of the single-electron Tb-Tb bond. Relaxation of magnetization in Tb2 @C79 N below 15 K proceeds via quantum tunneling of magnetization with the characteristic time τQTM =16 462±1230 s. At higher temperature, relaxation follows the Orbach mechanism with a barrier of 757±4 K, corresponding to the excited states, in which one of the Tb spins is flipped.

6.
Cent European J Urol ; 67(3): 302-9, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25247092

RESUMO

INTRODUCTION: Radical cystectomy is the gold standard for treating invasive bladder cancer. We report our outcomes of gasless minimum incision access (GMIA) for extracorporeal orthotopic bladder substitution (ECOBS) after laparoscopic radical cystectomy. MATERIAL AND METHODS: Radical surgery was performed in patients in the same hospital suffering from bladder cancer in T2N0M0 G1-2 stage. Group 1 included 11 patients aged 56.6 (42-72) years, which underwent laparoscopic radical cystectomy and ECOBS using GMIA. Group 2 included 18 patients aged 56.7 (41-76) years, which were operated by open radical cystectomy and orthotopic bladder substitution. RESULTS: The average duration of operation was 492.0 ±85.7 minutes in Group 1 and 318.0 ±58.0 in Group 2 (p = 0.001). Estimated blood loss was 290.0 ±120.0 and 613.2 ±359.0 ml in groups respectively. In the postoperative period, narcotic analgesics were used in the amount of 166.0 ±28.0 mg and 264.0 ±112.0 mg (p = 0.05), intestinal function recovery was observed on 3.5 ±0.9 and 6.0 ±2.9 days after the operation (p = 0.05) in the groups respectively. Minor postoperative complications were observed in 36.4% and 56.0%, major complications - in 9.1% and 11.2% in groups respectively. Median hospitalization time was 19.0 ±2.0 days in Group 1 and 24.9 ±6.5 in Group 2 (p = 0.01). CONCLUSIONS: GMIA in ECOBS can be used as an effective surgical approach after laparoscopic radical cystectomy; this method requires further observation.

7.
Cent European J Urol ; 66(4): 447-52, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-24757541

RESUMO

INTRODUCTION: For the procedure retroperitoneoscopic ureterolithotomy, the problems of access choice and thus visualization with utilizing minimally invasive surgical access (either with gasless single port method or gas insufflation) are solved. The decisions are based on the method of presurgery planning, grounded on matching the patient with a 3D model of the zone of surgical interest reconstructed according to the results of tomographic examination. MATERIAL AND METHODS: We used a hardware-software complex (HSC) for virtual modeling of the surgery zone and choosing the optimum points for minimally invasive surgical access. The HSC was recruited to choose optimum surgical access, realize presurgery planning, and estimation of the safety of the way of access chosen. The original method of matching the system of coordinates of a virtual model with the patient was offered. RESULTS: 12 patients with the calculus in the upper part of ureter averaging 11.5 (9-14) mm in size underwent gasless retroperitoneoscopic ureterolithotomy with use of the HSC. Mean age of the patients was 36.4 (25-49) years old. The surgeries lasted an average of 35.5 (25-40) minutes. Blood loss was averaged at 55.0 (30-90) ml. Healing by first intention was registered with all the patients. The mean hospitalization time was 6.0 (4-7) days. There were neither any complications nor difficulties, nor conversions from incorrectly chosen surgical access. CONCLUSIONS: The choice of the optimum surgical access according to the results of a virtual 3D model of the operation zone, matching the system of coordinates of the model with patient concurrence, and presurgery planning, was effective in cases of gasless single port and with gas insufflation retroperitoneoscopic ureterolithotomy.

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