The effect of glass transition temperature, Tg, on the self-assembly of "honeycomb" microstructures on nonplanar substrates was probed by the synthesis of a library of core cross-linked star polymers with different arm compositions. Star polymers based on poly(dimethyl siloxane), poly(ethyl acrylate), poly(methyl acrylate), poly(tert-butyl acrylate), and poly(methyl methacrylate) were synthesiz...

Exocrine and endocrine pancreatic function was studied in the rat after occlusion of the pancreatic ducts with acrylate or prolamine, respectively. After 5 months the effect of these procedures was a clear-cut exocrine insufficiency as evidenced by reduced enzyme activities in pancreatic tissue and in intestinal content, while the endocrine function was not impaired. The insulin secretory respo...

serotonin is believed as an important factor in brain function. the role of serotonin in cerebral psycho-patho-physiology has already been well established. however, the function of serotonin antagonist in anesthetized subjects under hyperthermia has not been studied properly. methods: experiments were performed in three groups of urethane-anesthetized rats, such as: (i) control group, (ii) who...

I NTEREST in urethane (NH2’CO.OC2H5) and related carbamic acid esters in the treatment of metastatic malignant tumors and leukemias has been greatly stimulated by the report of Haddow and Sexto& on the effects of urethane on tumors in experimental animals, and of Paterson, Haddow, Thomas and Watkinson2 on urethane therapy of human leukemias and malignant tumors. They demonstrated striking decre...

In the mol-ecule of the title compound, C(19)H(20)N(4)O(4), the rings are almost coplanar, forming a dihedral angle of 0.76 (3)°. In the crystal structure, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules.

The bismuth-catalyzed urethane reaction is significantly accelerated by generating heterobimetallic mixtures of bismuth and lithium carboxylates.

Propolis is a natural agent produced by honeybees from several botanical sources. The purpose of our study to evaluate the antitumor effect propolis extract (PE) against urethane-induced lung cancer compared Cisplatin (CIS) in rats. Some biochemical parameters oxidative stress, gene expression and histopathology transmission electron microscopy were estimated performed. PE improved induced chan...

This study assessed the effect of the molecular structure of newly synthesized methacrylate monomers on their chemical stability in human saliva, whereby these monomers can be used as dental composite resins. Six model monomethacrylates and two urethane-modified BisGMA monomers were added to human saliva, and their change in concentration after 24, 48, and 72 hours were measured by high-perform...

Hydrogels based on N-isopropylacrylamide and sodium acrylate as ionic comonomer were synthesized by free radical polymerization in water using N,N'-methylenebisacrylamide as crosslinker and ammonium persulfate as initiator. The glass transition of dried copolymers poly(N-isopropylacrylamide) (PNIPA) and poly(sodium acrylate) (SA) gels and demixing/mixing transition of PNIPA-SA hydrogels swollen...

Acrylates are well recognized as allergens. People working in the graphic arts field are exposed to acrylate-based printing inks and are therefore at high risk for occupational allergic contact dermatitis to acrylates. The most commonly used acrylic monomers in the printing process are 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2hydroxypropyl methacrylate, 2-hydroxyethyl methacrylate, a...