A graph is Ramsey unsaturated if there exists a proper supergraph of the same order with the same Ramsey number, and Ramsey saturated otherwise. We present some result concerning both Ramsey saturated and unsaturated graph. In particular, we show that a cycle Cn and a Jahangir Jm Ramsey unsaturated or saturated graphs of R(Cn,Wm) and R(Pn, Jm), respectively. We also suggest an open problems.

A mild and metal-free regiodivergent addition of carbon nucleophiles to α,β-unsaturated electrophiles was developed. Total 1,2-regioselectivity was observed in the addition of nitrobenzyl chloride derivative 1 to α,β-unsaturated aldehydes 2 in the presence of TDAE. Moreover, the reaction between p-nitrobenzyl chloride 1a and α,β-unsaturated iminium salts 4 led to the formation of the 1,4-adduct...

[1] This paper presents a class of analytical solutions for transient flow into unsaturated rock matrix. These analytical solutions are derived using specially correlated, physically meaningful relative permeability and capillary functions. The transient flow processes in unsaturated rock matrix blocks are generally described by the Richards’ equation. The analytical solutions describe the full...

The relative amounts of unsaturated fatty acids in the serum lipids of 14 patients who have undergone small bowel resection have been investigated. These results are compared with those from control subjects and also from patients suffering from cancer of the oesophagus. Both groups of patients showed patterns of unsaturated fatty acids suggesting essential fatty acid deficiency. In the resecti...

A convenient synthetic approach to α,β-unsaturated γ-butyrolactones and α,β-unsaturated γ-butyrolactams is developed. The reaction proceeds via decarboxylative iodination of paraconic acids and β-carboxyl-γ-butyrolactams, employing 1,3-diiodo-5,5-dimethylhydantoin (DIH) under irradiation, followed by dehydroiodination of β-iodo-γ-butyrolactones and γ-butyrolactams providing good yields of α,β-u...

Abstract. Stressed plants and polymer production can emit many unsaturated volatile organic esters (UVOEs). However, secondary aerosol (SOA) formation of UVOEs remains unclear, especially under complex ambient conditions. In this study, we mainly investigated ethyl methacrylate (EM) ozonolysis. Results showed that a substantial increase in H2SO4 particles promoted SOA with increasing SO2. An im...

In this research, an attempt was made to improve the brittle nature of Unsaturated Polyester (UP) polymer which cannot undergo plastic deformation be improved become more resilient by adding Thermoset Vinyl Ester and Methyl Methacrylate (MMA). To show change in toughness polyester material, a test is carried out provide tensile load flexural until material breaks This work reports successful fa...

Organic rubbers, comprising carbon–carbon links in their polymer backbone, are an essential part of modern everyday life. Tough, unique properties mainly governed by reinforcing fillers such as carbon black and silica. However, the power is not only driven chemical nature but also particle size, shape, distribution dispersion. In order to minimize agglomeration processing difficulties, idea sit...

Streptococcus pneumoniae hyaluronate lyase is a surface antigen of this Gram-positive human bacterial pathogen. The primary function of this enzyme is the degradation of hyaluronan, which is a major component of the extracellular matrix of the tissues of vertebrates and of some bacteria. The enzyme degrades its substrate through a beta-elimination process called proton acceptance and donation. ...