Notes on the Measurement of Values
Historians frequently use values to explain behavior. Since their studies focus on the behavior, they have neglected to measure values and change in values. The current practices of historians of values will not yield conclusions usable in the history of behavior.
Growing old in America
A history of aging in America surveys and compares actualities and attitudes in the eighteenth, nineteenth, and twentieth centuries and suggests practical improvements on the current inadequate system of pensions, social security, medicare, and other programs.
SEASONAL VARIATION OF ATTACHMENT APPARATUS AND COPULATORY ORGAN MORPHOMETRIC VARIABLES OF DACTYLOGYRUS CRUCIFER WAGENER, 1857 (MONOGENEA: DACTYLOGYRIDAE) ON THE GILLS OF ROACH (RUTILUS RUTILUS L.) IN LATVIAN WATER BODIES
There are many abiotic factors, such as oxygen, salinity, pH etc. that inpact to phenotypic plasticity of parasitic organisms. In the present studies, we are focused on seasonal variation in morphometry of monogenea from Dactylogyrus genus. Seasonal variation in measurments of attachment apparatus and copulatory organ of Dactylogyrus crucifer Wagener, 1857 were studied on museum colection material from 1956 and the period from 1984 to 1998. The main results indicate that difference between winter and spring conditions basically cause significant (p<0.05) changes in morphometrical variables of measurements of anchors, dorsal connective bar and copulatory organ.