Photoinitiated azo-hydrazo tautomerizm of 1- p

A novel photochromic compound with NH-N intramolecular H-bond (1-p-toluenesulphonylazo- 2,4,6,8-tetrakis(tert-butyl)phenoxazine) and the corresponding model structures (1-oxo-2,4,6,8-tetrakis(tertbutyl) phenoxazine, 2,4,5,7-tetrakis (tert-butyl )-1-( veratroylazo ) phenoxazine, 2,4,5,7-tetrakis ( tert-butyl )-Nacetyl- 1-(p-toluenesulphonylazo)phenoxazine) have been synthesized and their spectral and photochemical properties are studied. The photochromic transformations observed are found to be conditioned by ESIPT (as a primary step) followed by E-Z isomerisation about N–N-bond

Emerging Themes and Future Directions of Multi-Sector Nexus Research and Implementation

Water, energy, and food are all essential components of human societies. Collectively, their respective resource systems are interconnected in what is called the “nexus”. There is growing consensus that a holistic understanding of the interdependencies and trade-offs between these sectors and other related systems is critical to solving many of the global challenges they present. While nexus research has grown exponentially since 2011, there is no unified, overarching approach, and the implementation of concepts remains hampered by the lack of clear case studies. Here, we present the results of a collaborative thought exercise involving 75 scientists and summarize them into 10 key recommendations covering: the most critical nexus issues of today, emerging themes, and where future efforts should be directed. We conclude that a nexus community of practice to promote open communication among researchers, to maintain and share standardized datasets, and to develop applied case studies will facilitate transparent comparisons of models and encourage the adoption of nexus approaches in practice

Solid phase extraction of hydroxyaromatic compounds from aquatic environment

The dependence of extraction parameters of hydroxyaromatic compounds on sort of polyurethane foam, nature and composition of solution deposited on a polymer foam, content of inorganic salt in solution

Main factors of primary arterial hypertension development and pathogenesis in young, call-up-aged men with complicated family anamnesis

To identify the role of cardiovascular pathology, renal, renovascular and renourinal anomalies, neurogenic and endocrine diseases in arterial hypertension (AH) pathogenesis among young, call-up-aged men hospitalized for examination and primary AH diagnosis verification, 60 men aged 16-26 years were included in the study. Hemodynamics was assessed by blood pressure (BP) office measurement and ambulatory monitoring, together with B-mode echocardiography data. Renal and renourinal structure and function was assessed by static and dynamic scintigraphy, renal ultrasound, renal radiography, excretory urography, color Doppler angiography of renal arteries, measurement of microalbuminuria in morning urine and glomerular filtration rate by endogenous creatinine. Plasma levels of uric acid, red blood cell ABO antigens, and Rhesus factor were also assessed to verify familial AH predisposition. AH was not an isolated pathology, being combined with various anomalies and disorders of kidneys, renal vessels, renourinary, cardiovascular, endocrine systems, as well as with metabolic disturbances and obesity. In more than 50% of the cases, renal anomalies were explained by genetic or intrauterine factors. The results obtained point to the importance of genetic and inherited renal anomalies' role in chronic AH syndrome development among young, call-up-aged men

Modern data concerning to clinic and pathogeneD sis of severe and malignant arterial hypertension

Tо determine principal pathogenetic factors of therapy-resistant arterial hypertension (AH), 41 patients were examined: 1 male and 40 females aged 34-65 years, who suffered from malignant arterial hypertension (MAG). Control groups included 43patients (2 males and 341 females, aged 25-66 years) with Stage I-II AH by WHO-ISH classification (1999), as well as Stage III AH patients (N=45, 2 males and 43 females, aged 34-65 years). Intracardiac and central hemodynamics was assessed by echocardiography, renal function - by renoradiography, dynamic and static renoscintigraphy, and endogenous creatinine clearance. 24-hour extraction of cyclic nucleotides (cAMP and cGMP) was assessed by radioimmune method. Renal parenchimal disorders and vasorenal factors were the leading factors of MAH development. In MAH pathogenesis, various pathogenic factors - renal, vascular, endocrine, metabolic, and neurologic - were combined. All MAH patients demonstrated resistant hemodynamic type, with severe vasospastic reactions of eye vessels, and increased cGMP excretion, a symptom of reduced vasodilatator (NO) synthesis in vascular endothelium