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Articles by J.G. Ray
Total Records ( 2 ) for J.G. Ray
  J.G. Ray and K.J. George
  In order to assess the role of root CEC on the accumulation of Calcium in roots or shoots, pot-culture experiments with wild grasses was carried out. The seven species of grasses used were Sporobolus diander (L.), Eleusine indica (L.) Gaertn., Heteropogon contortus (L.) P. Beauv. Ex Roem and Schult, Cynodon dactylon (L.) Pers., Panicum repens Jacq, Stenotaphrum dimidiatum (L.) Brongn. and Chloris barbeta Sw. These grasses were significantly different in their root cation exchange capacity (4.6 to 12.3 C mol (P+) kg-1; p<0.05) as well as in their average root biomass (10 to 121 g per plant; p<0.05)/shoot biomass (4 to 60 g per plant; p<0.05) while growing in same environments. Four treatments of calcium (0.20, 0.25, 0.30 and 0.37 g kg-1 of soil) were given to all these species against a control; each treatment was given in four split doses with a gap of about 10 days in between. Calcium in the roots and shoots of these grasses was assessed at the end of the experimental cultures. Negative correlations were found between average Ca accumulations in plant tissues and root cation exchange capacity at all treatment levels. The correlation patterns between root cation exchange capacity and Ca in roots and that in shoots were quite distinct. Experiments of these kinds can reveal exact relationships between root characteristics and mineral accumulations in plants, which will have applications in agriculture involving mixed crops.
  G Saposnik , D.A Redelmeier , H Lu , E Fuller Thomson , E Lonn and J.G. Ray
 

Background: New immigrants to North America exhibit lower rates of obesity and hypertension than their native-born counterparts. Whether this is reflected by a lower relative risk of acute myocardial infarction (AMI) is not known.

Objective: To determine the risk of AMI among new immigrants compared to long-term residents, and, among those who develop AMI, their short- and long-term mortality rate.

Design: Population-based, matched, retrospective cohort study.

Setting: Entire province of Ontario, the most populated province in Canada, from 1 April 1995 to 31 March 2007.

Participants: A total of 965 829 new immigrants were matched to 3 272 393 long-term residents by year of birth, sex and geographic location.

Measurements: The main study outcome was hospitalization with a most responsible diagnosis of AMI. Secondary study outcomes among those who sustained an AMI were in-hospital, 30-day and 1-year mortality.

Results: The mean age of the participants at study entry was ~34 years. The incidence rate of AMI was 4.14 per 10 000 person-years among new immigrants and 6.61 per 10 000 person-years among long-term residents. After adjusting for age, income quintile, urban vs. rural residence, history of hypertension, diabetes mellitus and smoking and number of health insurance claims, the hazard ratio for AMI was 0.66 [95% confidence interval (CI): 0.63–0.69].

Conclusion: New immigrants appear to be at lower risk of AMI than long-term residents. This finding does not appear to be explained by the availability of health-care services or income level.

 
 
 
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