University of New Hampshire

About: University of New Hampshire is a education organization based out in Durham, New Hampshire, United States. It is known for research contribution in the topics: Population & Solar wind. The organization has 9379 authors who have published 24025 publications receiving 1020112 citations. The organization is also known as: UNH.

Seasonal patterns and environmental control of carbon dioxide and water vapour exchange in an ecotonal boreal forest

Abstract: Carbon dioxide, water vapour, and sensible heat fluxes were measured above and within a spruce dominated forest near the southern ecotone of the boreal forest in Maine, USA.

Sociocultural status and incidence of marital violence in Hispanic families

Abstract: It is not clear whether traditional cultural ideology influences wife assaults in Hispanic-American families, or if culture is confounded with the stresses of poverty, unemployment, and immigration status. Our 1992 study of 1,970 families, including a national oversample of Hispanic families, examines the incidence of marital violence in the three major Hispanic-American subgroups and in Anglo-American families, and considers how sociocultural status and attitudes towards violence affect wife assaults differentially. The findings show that Hispanic Americans, as a whole, do not differ significantly from Anglo Americans in their odds of wife assaults when norms regarding violence approval, age, and economic stressors are held constant. At the same time, considerable heterogeneity was apparent among ethnic subgroups on a number of measures. We also found that being born in the United States increases the risk of wife assaults by Mexican- and Puerto Rican- American husbands. However, the presence of norms sanctioning wife assaults within any group, regardless of socioeconomic status, is a risk factor for wife abuse. Language: en

Histidine kinase activity of the ETR1 ethylene receptor from Arabidopsis.

Abstract: ETR1 represents a prototypical ethylene receptor. Homologues of ETR1 have been identified in Arabidopsis as well as in other plant species, indicating that ethylene perception involves a family of receptors and that the mechanism of ethylene perception is conserved in plants. The amino-terminal half of ETR1 contains a hydrophobic domain responsible for ethylene binding and membrane localization. The carboxyl-terminal half of the polypeptide contains domains with homology to histidine kinases and response regulators, signaling motifs originally identified in bacteria. The putative histidine kinase domain of ETR1 was expressed in yeast as a fusion protein with glutathione S-transferase and affinity purified. Autophosphorylation of the purified fusion protein was observed on incubation with radiolabeled ATP. The incorporated phosphate was resistant to treatment with 3 M NaOH, but was sensitive to 1 M HCl, consistent with phosphorylation of histidine. Autophosphorylation was abolished by mutations that eliminated either the presumptive site of phosphorylation (His-353) or putative catalytic residues within the kinase domain. Truncations were used to delineate the region required for histidine kinase activity. An examination of cation requirements indicated that ETR1 requires Mn2+ for autophosphorylation. These results demonstrate that higher plants contain proteins with histidine kinase activity. Furthermore, these results indicate that aspects of ethylene signaling may be regulated by changes in histidine kinase activity of the receptor.