The surface of the friction pair during the lubricating process, which thereby reduced friction. 14alpha-hydroxy-Sprengerinin-C According to the above results, the tribochemical mechanism of NHB as additives in RSO is discussed below. First, the additive was adsorbed on the metal surface, taking on competitive adsorption with RSO in the lubricating process. The tribological reaction between metals produced a partially high temperature that resulted in the tribochemical reaction of the additive with the steel ball surface. The additive molecule 
decomposed, and the ethanolamine group reacted with the metal surface to form organic N and N-containing metal complex film. Subsequently, the benzotriazole ethanol group was adsorbed on the surface. The borate group reacted with the metal surface to form inorganic boron oxygen film, which possessed a high degree of hardness, contributing to the higher carrying capacity of the tribological surface film. The inorganic and organic protective film in the metal surface had a certain tribological performance. Therefore, a mixed reaction boundary film existed in the worn steel surfaces caused by the chemical composition, base oil, and additive in the Ganoderic-acid-G lubrication process. The lubricant film formation improved the tribological properties of the base oil. In short, the tribological mechanism of the synthesized borate ester derivative showed that the additive underwent a chemical reaction with the steel ball surface and then formed a complex boundary lubricating film that contained organic N-containing compounds and inorganic salts, such as FeB, Box, and BN, among others. The formation of lubricating films improved the tribological properties of the base oil. The projected rise in global rates of diabetes mellitus and hypertension portend increasing rates of associated diseases such as chronic kidney disease. Resource-limited countries lacking the ability to offer renal replacement therapy for end-stage renal disease face the significant challenge of early kidney disease detection to allow for timely intervention to retard disease progression. Yet in many regions of the world, little data exist estimating the prevalence of CKD. The south-east Asian kingdom of Cambodia lies bordered between Vietnam, Thailand, Laos, and the Gulf of Thailand. In 2010, the country population was totaled to be 14.1 million, with a life expectancy of 64.6 years for men and 70.1 years for women.12 The World Health Organization lists Cambodia as a low-income country, with about 80% of its inhabitants living in rural settings. It is estimated that about 46% of all deaths in the country are secondary to non-communicable diseases. In 2010, a national cross-sectional STEPS survey was performed in Cambodia estimating the prevalence of noncommunicable diseases, allowing for the first-ever estimation of conditions that increase the risk for CKD. According to study results, about one in every ten respondents had hypertension and 2.9% of individuals were diagnosed with diabetes mellitus. The prevalence of both hypertension and diabetes were significantly more common in the urban than in the rural areas. The results of the study also described the relationship between gender and chronic conditions. Hypertension was more frequent in men, but women had a higher prevalence of elevated total cholesterol and obesity. These data raise concern for a large undetected burden of kidney disease in the country. However, to date no estimates on the prevalence of reduced renal function either in the population-at-large or in high-risk sub-groups with diabetes and/ or hypertension have been made from anywhere in Cambodia. In order to bridge this gap in our knowledge, we undertook this analysis to develop the first-ever estimates of the prevalence of reduced glomerular filtration rate.