Family Planning Perspectives pared with 63% of those among Hispanic women and 54% of those among white and other non-Hispanic women.2 The greater prevalence of unplanned pregnancy among low-income women and among black or Hispanic women reflects their lower levels of contraceptive use3 and higher likelihood of contraceptive failure.4 However, it is not clear whether racial and ethnic difference...

cold tolerance is an adaptative mechanism that plants in temperate climates require to survive and grow in suboptimal temperatures.  exposed plant to low temperature produces a myriad of measurable changes in biochemical characters that are often highly correlated with plant cold tolerance.  a key element of cereal adaptation to cold is represented by the capacity for physiological adjustments ...