The impact of Nd3+/La3+ substitution on the cation distribution and phase diagram in the La2SrAl2O7-Nd2SrAl2O7 system

Received: 28.04.2018. Accepted: 09.05.2018. Published: 10.05.2018.The effect of isovalent cation substitution of lanthanum atoms in the structure of La2SrAl2O7 oxide, and phase equilibria (solidus-liquidus curves) in the binary system La2SrAl2O7-Nd2SrAl2O7 were studied. It was found that Nd3+ substitution for La3+ has effect on the structure of La2SrAl2O7 in respect of the character of cation distribution in the solid solution La2–xNdxSrAl2O7 from statistically disordered to the ordered one where strontium cations predominantly occupied the rock-salt layers, as reflected by the solidus-liquidus lines

Diverticular disease of the colon: diagnosis, treatment, and prevention of complications

Introduction. Diverticular disease of the colon is one of the most common gastrointestinal diseases. During the last 30–40 years, there has been a “rejuvenation” of the disease. Today, the prevalence of the disease in people under 40 years of age is 5–10%, and therefore the costs of diagnostic testing and treatment are gradually increasing, which makes the disease socially significant.Aim. To study the clinical features of diverticular disease, the features of diagnosis and treatment, and prophylactic approaches. The specific objectives of the analysis were to study epidemiology; study the role and a necessary minimum set of laboratory diagnostic test methods for the diagnosis of diverticular disease; study the incidence rate of SIBO and its impact on the clinic presentation and treatment; develop an algorithm for the diagnosis, treatment, prevention, and management of patients with diverticular disease.Materials and methods. A total of 195 patients with different forms of diverticular disease were examined. As diagnostic tests, we used blood tests, stool tests, biochemical tests; inflammatory tests: calprotectin, CRP, fibrinogen, ferritin; ultrasound imaging, irrigoscopy, CT, NMR, colonoscopy (if medically required); clinical manifestations at different stages of the course of diverticular disease. 5-aminosalicylates were used to treat exacerbation with inflammation; alpha-normix and motility regulators were used to treat exacerbation without signs of inflammation.Results. On the basis of the study results, we suggested an algorithm for the diagnosis, management and treatment of patients with diverticular disease. According to the particulars of the management, it is reasonable to divide all patients with diverticular disease into three groups: 1) patients who underwent acute diverticulitis; 2) patients with uncomplicated diverticular disease; 3) patients with complicated diverticular disease.Conclusions. The first two groups should be followed up by a gastroenterologist/general practitioner, the third group should be followed up by a surgeon. The patient tested positive for SIBO should receive drugs to eradicate SIBO. The treatment regimens for exacerbation of diverticular disease are proposed

Влияние взаимозамещения редкоземельных элементов наструктуру и свойства твердых растворов (Pr, Nd, Sm)BaCoFe5+δ

Using the solid-state reaction method, (Pr,Nd,Sm)BaCoFeO5+δ solid solutions have been synthesized, their lattice constants and oxygen nonstoichiometry have been determined and their thermal expansion and electrical properties have been studied. It has been found that (Pr,Nd,Sm)BaCoFeO5+δ solid solutions show positive deviations from ideality and their structural parameters, thermal and electrotransport properties can be controlled by intersubstitution of rare earth elements in their structure.Твердофазным методом синтезированы твердые растворы (Pr, Nd, Sm)BaCoFeO5+δ, определены параметры их кристаллической структуры и кислородная нестехиометрия, изучены их тепловое расширение и электрические свойства. Установлено, что твердые растворы (Pr, Nd, Sm)BaCoFeO5+δ характеризуются положительными отклонениями от идеальности, а их структурными параметрами, тепловыми и электротранспортными свойствами можно управлять путем направленного взаимозамещения РЗЭ в их структуре