Words similar to thcentury
Example sentences for: thcentury
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Low levels of high density lipoprotein cholesterol and high levels of low density lipoprotein cholesterol have been identified as independent coronary risk factors [ 1 ] . Throughout the 20 thcentury, many investigators have focused their interest on prevention and therapy of the cardiovascular diseases through the evaluation and modification of several lifestyle risk factors.
For much of the 20 thcentury the secondary sex ratio (male births/all births) has been declining in many countries [ 16 17 18 ] . It has been speculated that this declining sex ratio is a sentinel indicator of environmental contamination [ 17 ] , although others have argued that, on a population level, this is not the case [ 16 18 19 20 21 ] . There is evidence, however, that hormonal levels around the time of conception are associated with the sex ratio of offspring [ 22 ] , and there is compelling evidence that exposure to particular chemicals does lead to changes in the sex ratio of offspring [ 23 24 25 26 27 ] , as seen, for example, with exposure to dioxins following an explosion at an herbicide plant in Seveso, Italy [ 26 27 ] . Animal studies have suggested that exposure to PCBs may lower the sex ratio of offspring [ 28 29 30 ] . Studies among human populations exposed to PCBs in different settings, however, have suggested increases [ 31 ] , decreases [ 32 33 ] , or no change [ 34 35 ] in the sex ratio.
This phenomenon led to some confusion in 19 thcentury literature concerning whether garpike cleavage is holoblastic or meroblastic.
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