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Full-Text Articles in Life Sciences
Potential For Nitrogen Fixation And Nitrification In The Granite-Hosted Subsurface At Henderson Mine, Co, Elizabeth D. Swanner, Alexis S. Templeton
Potential For Nitrogen Fixation And Nitrification In The Granite-Hosted Subsurface At Henderson Mine, Co, Elizabeth D. Swanner, Alexis S. Templeton
Elizabeth D. Swanner
The existence of life in the deep terrestrial subsurface is established, yet few studies have investigated the origin of nitrogen that supports deep life. Previously, 16S rRNA gene surveys cataloged a diverse microbial community in subsurface fluids draining from boreholes 3000 feet deep at Henderson Mine, CO, USA (Sahl et al., 2008). The prior characterization of the fluid chemistry and microbial community forms the basis for the further investigation here of the source of NH4+. The reported fluid chemistry included N2, NH4+ (5–112 μM), NO2− (27–48 μM), and NO3− (17–72 μM). In this study, the correlation between low NH4+ concentrations …
Jncml-Like, An Ef-Hand Motif-Containing Gene Seasonally Upregulated In The Transition Zone Of Black Walnut (Juglans Nigra L.), Priyanka Surana, Zhonglian Huang, Daisuke Kihara, Richard Meilan, Keith Woeste
Jncml-Like, An Ef-Hand Motif-Containing Gene Seasonally Upregulated In The Transition Zone Of Black Walnut (Juglans Nigra L.), Priyanka Surana, Zhonglian Huang, Daisuke Kihara, Richard Meilan, Keith Woeste
Priyanka Surana
The economic value of a black walnut (Juglans nigra L.) tree is strongly determined by the quality and quantity of darkly colored heartwood in its stem. To understand the regulation of heartwood formation, we analyzed the region of heartwood formation in walnut stems (i.e., the transition zone, TZ) for the expression of 80 ESTs. Semi-quantitative RT-PCR and real-time PCR was performed to detect expression changes of candidate genes in the TZ and sapwood of trees harvested in summer and fall. Results revealed that the transcript of a clone containing two presumed EF-hand motifs was expressed at higher levels in the …