Synthesis of Few-layer Graphene Sheets via Chemical and Thermal Reduction of Graphite Oxide

Few-layer graphene sheets were produced from graphite oxide (GO) chemical and thermal reduction. For the chemical reduction of GO as reducing agents were used hydrazine hydrate, hydroxylammonium chloride, sodium borohydride and sodium sulfite. The reduced material was characterized by elemental analysis, thermo-gravimetric analysis, scanning electron microscopy, X-ray diffraction, Fourier transform infrared and Raman spectroscopy. A comparison of the deoxygenation efficiency of graphene oxide suspension by different method or reductants has been made, revealing that the highest degree of reduction was achieved by thermal reduction and using hydrazine hydrate and hydroxylammonium chloride as a reducing agents. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3506

Preparation of Amino-Functionalized Graphene Sheets and their Conductive Properties

Amino-functionalized graphene sheets were prepared through chemical reduction by hydrazine hy-drate, amination or amidation of graphite oxide. For amination of graphite oxide were used polyamine such as ethylenediamine, diethylenetriamine and triethylenetetramine. Addition of amine groups to graphene is identified by Fourier transform infrared spectroscopy, Raman spectroscopy, elemental analysis and ther-mogravimetry. Scanning electron microscopy data indicate that the organic amine is not only as nitrogen sources to obtain the nitrogen-doped graphene but also as an important modification to control the assem-bly of graphene sheets in the 3D structures. The electrical conductivity of the materials obtained by amina-tion and amidation of graphene is much smaller than that of reduced graphite oxide. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3563

К вопросу об исследовании песенного дискурса: лингвокультурологический аспект

The article deals with the problem of song discourse in lingvocultural aspect.В данной статье рассматривается взаимосвязь песенного дискурса и культурного интертекста

Pt supported on reduced graphite oxide catalysts for H2 activation

Platinum catalysts of H2 activation with average size ≤2.0 nm were prepared in a base of reduction conversion of graphene oxide. A low few-layered carbon nanomaterial was prepared by thermoexpansion and annealing of graphene oxide. The uniformly dispersed Pt nanoparticles were supported on two-dimension graphene flat material by the use of pyridine or polyethyleneimine in alkaline (pH10) media as chelating agent modificating both metal precursor H2PtCl6 and support. Vacancies in carbon material formed as a result of thermoexpansion and annealing of graphite oxide probablly serve as anchor groups in platinum supporting. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3557

Анализ течения беременности, родов, послеродового периода и развития плода у женщин с ожирением и метаболическим синдромом

This overview presents the various aspects matabolic syndrome, modern approaches to the problem of obesity. The comparative data of pregnancy, childbirth and the postpartum period in women with obesity and metabolic syndrome.В обзоре представлены различные аспекты матаболического синдрома, современные взгляды на проблему ожирения. Изложены сравнительные данные течения беременности, родов и послеродового периода у женщин с ожирением и метаболическим синдромом

Стратегическая модель репрезентации оппозиции «свой-чужой» в контексте политического выступления

The article deals with political discourse having a famous politician's speech as an example for the analysis. Further construction of a pattern is made to show basic characteristics of the political speech in a given opposition. The article reveals a short review of the term “discourse” in general and exposes the significance of the results for future exploration.В статье рассматривается политический дискурс на примере анализа выступления известного политического деятеля с целью дальнейшего построения схематической модели, в которой могут быть отражены ключевые характеристики данного выступления в рамках оппозиции «свой-чужой». В статье также приводится краткий обзор дискурса в общем, а также выявляется роль полученных результатов для его дальнейшего изучения

Surgical treatment of solitary adrenal metastasis from non-small cell lung cancer

Background. Adrenal glands are the site of solitary synchronous and metachronous metastases in non-small cell lung cancer (NSCLC). The presence of solitary adrenal metastasis from lung cancer provides survival benefit; however, currently, there are no exact treatment algorithms. Objectives of the study: to assess shortand long-term treatment outcomes in patients with adrenal metastases from NSCLC. Material and methods. Treatment outcomes of patients undergoing adrenalectomy for NSCLC were analyzed. Results. From 1993 to 2014, 13 patients (11 males/2 females aged between 44 and 78, median age 58 years) with solitary adrenal metastases (adenocarcinoma (n=7), squamous cell carcinoma (n=4), large cell carcinoma (n=2); synchronous metastases – 5 cases (38.5%) and metachronous metastases – 8 cases (61.5 %), underwent adrenalectomy (one patient was given stereotactic radiation therapy for brain metastasis). Laparoscopic adrenalectomy was performed in 10 (76.9 %) cases, open adrenalectomy was performed in 3 (23.1 %) cases. The average adrenal tumor diameter was 74.6 ± 13.3 mm (25–170 mm). In the early postoperative period, two lethal outcomes were recorded. The median follow-up time after adrenalectomy was 20 months (3 to 267 months), the average follow-up time was 51.5 ± 23.5 months. The 3-year overall survival rates in patients with synchronous and metachronous metastases were 25.0 ± 2.2 % and 57.1 ± 1.9 %, respectively; however, the differences were not statistically significant (p=0.63; LogRank). The extent of surgery, morphological tumor type and status of regional lymph nodes produced no influence on the survival rate (p>0.05). Conclusion. No factors influencing survival in patients with solitary adrenal metastases from NSCLC were identified. © 2020, Tomsk National Research Medical Center of the Russian Academy of Sciences. All rights reserved

Adrenal gland as a target of synchronous and metacronous metastasis from renal cell carcinoma: results of surgical treatment in a single institution

Background. Surgical treatment of solitary and oligometastatic metastases in renal cell carcinoma (RCC) is one of the treatment options for modern oncology. The objective of study to compare surgical outcomes in treatment of synchronous and metachronous solitary metastatic adrenal tumors in RCC. Materials and methods. The study included 93 patients with kidney cancer, from 1997 till 2018, who underwent surgical treatment in the urological oncology department of the P.A. Hertzen Moscow Oncology Research Institute. The 1st group is represented by 58 patients with RCC and synchronous secondary adrenal gland lesion, who underwent simultaneous surgery, consist of radical nephrectomy and adrenalectomy without subsequent adjuvant therapy. The 2nd group included 35 patients with metachronous solitary metastatic adrenal gland lesion who underwent surgical treatment. Results. The progression of disease to left adrenal gland was observed in 40 (43.0 %) cases, to the right - in 39 (41.9 %), both adrenal glands - 14 (15.1 %) cases. The median diameter of the adrenal tumors was 44 (4-170) mm, the most common in both groups were tumors less than 5 cm (58.1 %). The sensitivity of ultrasound in the diagnosis of adrenal tumors was 80.6 %, computed tomography - 93.5 %, adrenal biopsy - 73.9 %. The median of the observation time was 42 months (1st group - 24 months, 2nd group - the median was not achieved). The one-year survival of patients with a metachronous lesion of adrenal was 82.3 +/- 76.6 % versus 52.8 +/- 7.1 % in the synchronous lesion group, three-year survival was 79.2 +/- 7.0 % versus 32.3 +/- 7.6 % and five-year - 57.0 +/- 10.0 % versus 16.2 +/- 12.0 %, respectively. In multivariate analysis, only a metachronous lesion is a factor of favorable prognosis (p = 0.002). Conclusion. Surgical treatment for metachronous adrenal gland metastatic lesions is appropriate intervention and provides better patient survival rates compared to synchronous lesions

Анатомия сосудисто-нервного пучка и методы ее сохранения при нервосберегающей простатэктомии

Providing a high quality of life for a man after performing radical prostatectomy for prostate cancer is currently one of the topical problems of urology and andrology. Nervous-protective radical prostatectomy is one of the high-tech operations in urology and the surgeon's task is not only to remove the tumor of the prostate gland, but also to ensure a high quality of life for the patient. The importance and urgency of this problem is evidenced by the fact that most of the issues that arise in patients in conversation with a surgeon before surgical intervention are devoted to it. The National Institute of Health of the USA shows that the incidence of prostate cancer is about 9.5% per year, and the localized form began to occur in younger men. In this regard, the surgeon faces the task not only to cure the patient of malignant education, but also to maintain the erectile function and the continent's indicators, thereby improving the quality of life. At the present stage, diagnostic methods make it possible to detect early prostate cancer much more often, so that the identification and treatment of such patients become more accessible and allows the use of this operation. However, for the preservation of the neurovascular bundle, it is mandatory to know the anatomical features of this zone. Over the past few decades, anatomical studies have been conducted that described the neuroanatomy of the prostate and the adjacent tissue. This article summarizes the latest results of studies of neuroanatomical studies, some of which contradict the established consensus on pelvic anatomy.Обеспечение высокого качества жизни мужчины после выполнения радикальной простатэктомии по поводу рака предстательной железы (РПЖ) в настоящее время является одной из актуальных проблем урологии и андрологии. Нервосберегающая радикальная простатэктомия является одной из высокотехнологичных операций в урологии, и задача хирурга состоит не только в удалении опухоли предстательной железы, но и в обеспечении высокого качества жизни пациента. О важности и актуальности данной проблемы свидетельствует тот факт, что именно ей посвящено большинство вопросов, возникающих у больных в беседе с хирургом еще до хирургического вмешательства. Национальный институт здравоохранения США показывает, что прирост заболеваемости РПЖ ежегодно составляет около 9,5%, а локализованная форма стала встречаться у более молодых мужчин. В связи с этим перед хирургом стоит задача не только излечить пациента от злокачественного образования, но и сохранить эректильную функцию и показатели континенции, тем самым улучшить качество жизни. На современном этапе диагностические методы дают возможность значительно чаще обнаруживать ранний рак предстательной железы, благодаря чему выявление и лечение таких пациентов стало более доступным и позволяет применить данную операцию. Однако для сохранения сосудисто-нервного пучка обязательным является знание анатомических особенностей данной зоны. За последние несколько десятилетий проведены анатомические исследования, которые описали нейроанатомию предстательной железы и прилегающей ткани. В этой статье кратко изложены последние результаты исследований нейроанатомических исследований, некоторые из которых противоречат установленному консенсусу в отношении анатомии таза