ABSTRACT
The review is devoted to current and promising areas of application of graphene and materials based on it for generating environmentally friendly hydrogen energy. Analysis of the results of theoretical and experimental studies of hydrogen accumulation in graphene materials confirms the possibility of creating on their basis systems for reversible hydrogen storage, which combine high capacity, stability, and the possibility of rapid hydrogen evolution under conditions acceptable for practical use. Recent advances in the development of chemically and heat-resistant graphene-based membrane materials make it possible to create new gas separation membranes that provide high permeability and selectivity and are promising for hydrogen purification in processes of its production from natural gas. The characteristics of polymer membranes that are currently used in industry for the most part can be significantly improved with small additions of graphene materials. The use of graphene-like materials as a support of nanoparticles or as functional additives in the composition of the electrocatalytic layer in polymer electrolyte membrane fuel cells makes it possible to improve their characteristics and to increase the activity and stability of the electrocatalyst in the reaction of oxygen evolution.
ABSTRACT
Minimally-invasive operations were used in 156 patients with acute appendicitis. Laparoscopic appendectomy with ligature method by F. Gotz was performed in 64 (41%) patients (group 1), combined appendectomy--in 32 (20.5%) patients (group 2), laparoscopic operation with ligature method in the authors modification in combination with developed prophylactic complex--in 60 (38.5%) patients (group 3). Conversion to open operation was necessary in 6 (3.8%) patients. Intraoperative complications were seen in 5.1% operated patients, postoperative--in 6.4%, however rate of complications in each group ranged from 10.9 to 1.7%. Results of bacterial examination during different stages of laparoscopic appendectomy are provided. Programme of postoperative complications prophylaxis is described. Algorithm of differential approach to various methods of laparoscopic or minimally-invasive appendectomy in presented.
Subject(s)
Appendectomy/methods , Appendicitis/surgery , Laparoscopy/methods , Acute Disease , Algorithms , Humans , Minimally Invasive Surgical Procedures/methods , Postoperative Complications/prevention & controlABSTRACT
The increased intensity and volume of surgical interventions in large surgical hospitals leads to a greater amount of postoperative complications. Intrahospital strains of infections are responsible for some of such complications. The complex investigations of the microbiological background allowed the range of prophylactic measures against gram-positive microflora to be enlarged.
