Stomach cancer is still the fourth most common cancer;thus,it remains an important public health burden worldwide,especially in developing countries.The remarkable geographic variations in the rates of stomach cancer ...Stomach cancer is still the fourth most common cancer;thus,it remains an important public health burden worldwide,especially in developing countries.The remarkable geographic variations in the rates of stomach cancer indicate that dietary factors,including a range of food groups to which salt and/or nitrates have been added,may affect stomach cancer risk.In this paper,we review the results from ecologic,case-control and cohort studies on the relationship between salt or salted foods and stomach cancer risk.The majority of ecological studies indicated that the average salt intake in each population was closely correlated with gastric cancer mortality.Most case-control studies showed similar results,indicating a moderate to high increase in risk for the highest level of salt or salted food consumption.The overall results from cohort studies are not totally consistent,but are suggestive of a moderate direct association.Since salt intake has been correlated with Helicobacter pylori(H pylori) infection,it is possible that these two factors may synergize to promote the development of stomach cancer.Additionally,salt may also cause stomach cancer through directly damaging gastric mucus,improving temporary epithelial proliferation and the incidence of endogenous mutations,and inducing hypergastrinemia that leads to eventual parietal cell loss and progression to gastric cancer.Based on the considerable evidence from ecological,case-control and cohort studies worldwide and the mechanistic plausibility,limitation on salt and salted food consumption is a practical strategy for preventing gastric cancer.展开更多
Viscosities of uranium solutions in H2O and 3 mol/L HNO3 medium were measured by Ubbelhode flow vis-cometer in the concentration range of 0.5%3.0% from 10 篊 to 30 篊 at 5 篊 interval. Viscosity data were interpreted ...Viscosities of uranium solutions in H2O and 3 mol/L HNO3 medium were measured by Ubbelhode flow vis-cometer in the concentration range of 0.5%3.0% from 10 篊 to 30 篊 at 5 篊 interval. Viscosity data were interpreted in terms of an empirical equation; h =aoexp(boM+coM2). Values of coefficients ao, bo and co were calculated for all the three systems studied. Flow activation energies and thermodynamic parameters were also evaluated.展开更多
文摘Stomach cancer is still the fourth most common cancer;thus,it remains an important public health burden worldwide,especially in developing countries.The remarkable geographic variations in the rates of stomach cancer indicate that dietary factors,including a range of food groups to which salt and/or nitrates have been added,may affect stomach cancer risk.In this paper,we review the results from ecologic,case-control and cohort studies on the relationship between salt or salted foods and stomach cancer risk.The majority of ecological studies indicated that the average salt intake in each population was closely correlated with gastric cancer mortality.Most case-control studies showed similar results,indicating a moderate to high increase in risk for the highest level of salt or salted food consumption.The overall results from cohort studies are not totally consistent,but are suggestive of a moderate direct association.Since salt intake has been correlated with Helicobacter pylori(H pylori) infection,it is possible that these two factors may synergize to promote the development of stomach cancer.Additionally,salt may also cause stomach cancer through directly damaging gastric mucus,improving temporary epithelial proliferation and the incidence of endogenous mutations,and inducing hypergastrinemia that leads to eventual parietal cell loss and progression to gastric cancer.Based on the considerable evidence from ecological,case-control and cohort studies worldwide and the mechanistic plausibility,limitation on salt and salted food consumption is a practical strategy for preventing gastric cancer.
文摘Viscosities of uranium solutions in H2O and 3 mol/L HNO3 medium were measured by Ubbelhode flow vis-cometer in the concentration range of 0.5%3.0% from 10 篊 to 30 篊 at 5 篊 interval. Viscosity data were interpreted in terms of an empirical equation; h =aoexp(boM+coM2). Values of coefficients ao, bo and co were calculated for all the three systems studied. Flow activation energies and thermodynamic parameters were also evaluated.
