An excellent review of the earlier literature was presented by Valley (1928) by which time it gradually had been proved and accepted that all microorganisms require C02 for growth and reproduction. Walker (1932), Winslow et al. (1932), and Gladstone et al. (1935) related the length of the lag phase to the C00 content of the medium or of the cells themselves. Wood and Werkman (1935) opened an entirely new approach to the study of C02 utilization when they advanced the concept of heterotrophic assimilation. Since 1935 many papers have appeared dealing with various aspects of the Wood-Werkman and related reactions [reviewed most recently by Utter and Wood (1951)]. Pappenheimer and Hottle (1940) and Lyman et al. (1946) considered the role of C02 in metabolism in relation to other known growth factors, namely, purines and amino acids and pyridoxine. Lwoff and Monod (1947) found that glutamic acid did not change the growth rate of Escherichia coli under optimal C02 pressure. If the C02 tension was lowered, the growth rate decreased; glutamic acid and other C4 and C0 dicarboxylic acids compensated for this effect partially, but at very low C02 tensions these compounds were without action. They
This study assessed the validity of the Spanish surname infant mortality rate as an index of urban Mexican American health status. Neonatal, postneonatal, and risk-factor-specific mortality rates were computed from linked birth and infant death records of the 1974-75 Harris County, Texas, cohort of 68,584 for Spanish surname White, non-Spanish surname White, and Black single live births. Infants of Mexican-born immigrants were distinguished from those of other Spanish surname parents by parental nativity information on birth records. Infants of Mexican immigrants
IntroductionAlthough the Texas Spanish surname population, largely Mexican American, has a disproportionate share of infant mortality risk factors (low socioeconomic and educational status, high fertility and large family size, absent or inadequate prenatal care,'-and high incidence of diabetes mellitus and infectious diseases5), the actual infant mortality rate
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.