Research Triangle Park

About: Research Triangle Park is a nonprofit organization based out in Durham, North Carolina, United States. It is known for research contribution in the topics: Population & Environmental exposure. The organization has 24961 authors who have published 35800 publications receiving 1684504 citations. The organization is also known as: RTP.

Classroom Effects on Children’s Achievement Trajectories in Elementary School

Abstract: This nonexperimental, longitudinal field study examines the extent to which variation in observed classroom supports (quality of emotional and instructional interactions and amount of exposure to literacy and math activities) predicts trajectories of achievement in reading and math from 54 months to fifth grade. Growth mixture modeling detected two latent classes of readers: fast readers whose skills developed rapidly and leveled off, and a typical group for which reading growth was somewhat less rapid. Only one latent class was identified for math achievement. For reading, there were small positive associations between observed emotional quality of teacher-child interactions and growth. Growth in math achievement showed small positive relations with observed emotional interactions and exposure to math activities. There was a significant interaction between quality and quantity of instruction for reading such that at higher levels of emotional quality there was less of a negative association between amoun...

Jasmonic Acid Signaling Modulates Ozone-Induced Hypersensitive Cell Death

Abstract: Recent studies suggest that cross-talk between salicylic acid (SA)‐, jasmonic acid (JA)‐, and ethylene-dependent signaling pathways regulates plant responses to both abiotic and biotic stress factors. Earlier studies demonstrated that ozone (O 3 ) exposure activates a hypersensitive response (HR)‐like cell death pathway in the Arabidopsis ecotype Cvi-0. We now have confirmed the role of SA and JA signaling in influencing O 3 -induced cell death. Expression of salicylate hydroxylase (NahG) in Cvi-0 reduced O 3 -induced cell death. Methyl jasmonate (Me-JA) pretreatment of Cvi-0 decreased O 3 -induced H 2 O 2 content and SA concentrations and completely abolished O 3 -induced cell death. Cvi-0 synthesized as much JA as did Col-0 in response to O 3 exposure but exhibited much less sensitivity to exogenous Me-JA. Analyses of the responses to O 3 of the JA-signaling mutants jar1 and fad3/7/8 also demonstrated an antagonistic relationship between JA- and SA-signaling pathways in controlling the magnitude of O 3 -induced HR-like cell death.