Results 51 to 60 of about 2,662,632 (251)

Human alteration of the global nitrogen cycle: Sources and consequences [PDF]

, 1997
Nitrogen is a key element controlling the species composition, diversity, dynamics, and functioning of many terrestrial, freshwater, and marine ecosystems.
Howarth, R. W., Vitousek, P. M., Schlesinger, W. H., Matson, P. a., Tilman, D., Aber, J. D., Schindler, D. W., Likens, G. E.   +7 more
core   +1 more source

Partial depletion of plasminogen activator inhibitor‐1 decreases subcutaneous fat cell hypertrophy and liver cholesterol in high‐fat‐fed female mice

FEBS Letters, EarlyView.
Obesity raises blood levels of PAI‐1, a protein linked to metabolic dysfunction‐associated steatotic liver disease in people with obesity. In female mice fed a high‐fat diet, partially lowering PAI‐1 led to smaller subcutaneous fat cells and lower liver cholesterol, without changing body weight or insulin sensitivity.
Claudia E. Ramirez Bustamante, Robert Sharp, Pradip K. Saha, Elizabeth S. Anaya, Elizabeth L. Lieu, Evelyn L. de Groot, Pooja Patel, Mi Jeong Heo, Aaron R. Cox, Kang Ho Kim, Sean M. Hartig   +10 more
wiley   +1 more source

Distribution of Dissolved Nitrogen Compounds in the Water Column of a Meromictic Subarctic Lake

Nitrogen, 2021
In order to better understand the biogeochemical cycle of nitrogen in meromictic lakes, which can serve as a model for past aquatic environments, we measured dissolved concentrations of nitrate, nitrite, ammonium, and organic nitrogen in the deep (39 m ...
Taisiya Ya. Vorobyeva, Anna A. Chupakova, Artem V. Chupakov, Svetlana A. Zabelina, Olga Y. Moreva, Oleg S. Pokrovsky   +5 more
doaj   +1 more source

Emerging experimental and computational methods for studying redox‐regulated structural transitions

FEBS Letters, EarlyView.
Redox reactions can reshape proteins and alter how they behave in cells, with important consequences for health and disease. This review explores emerging experimental and computational approaches for discovering these redox‐sensitive protein switches, revealing their structural effects, and predicting their behavior, opening new opportunities to ...
Tasneem Rass, Dana Reichmann, Gábor Erdős   +2 more
wiley   +1 more source

Nitrogen Isotopes in the Global Ocean [PDF]

, 2013
Nitrogen is an essential nutrient for life. Its low abundance throughout much of the sunlit surface ocean limits the growth of primary producers that form the base of ocean ecosystems.
Somes, Christopher J., Somes, Christopher   +1 more
core  

Photorespiratory nitrogen cycle

, 1978
MOST temperate plants form phosphoglyceric acid as the first stable product of photosynthesis. These plants also photo-respire, that is, during CO2 fixation they simultaneously release CO2 to the atmosphere from the oxidation of an intermediate of the ...
P. J. LEA, I. F. BIRD, R. M. WALLSGROVE, Lea, P. J., M. J. CORNELIUS, A. J. KEYS, Miflin, B. J., Cornelius, M. J., Wallsgrove, R. M., B. J. MIFLIN, Bird, I. F., Keys, A. J.   +11 more
core   +1 more source

Light-driven integration of diazotroph-derived nitrogen in euphotic nitrogen cycle

Nature Communications
The bioavailable nitrogen fixed by diazotrophs is critical for sustaining productivity in the oligotrophic ocean. Despite this, understanding how diazotroph-derived nitrogen integrates into the nitrogen cycle within the euphotic zone remains unknown ...
Hui Shen, Xianhui S. Wan, Wenbin Zou, Minhan Dai, Min N. Xu, Shuh-Ji Kao   +5 more
doaj   +1 more source

Ecological Energetic Perspectives on Responses of Nitrogen-Transforming Chemolithoautotrophic Microbiota to Changes in the Marine Environment

Frontiers in Microbiology, 2017
Transformation and mobilization of bioessential elements in the biosphere, lithosphere, atmosphere, and hydrosphere constitute the Earth’s biogeochemical cycles, which are driven mainly by microorganisms through their energy and material metabolic ...
Hongyue Dang, Chen-Tung A. Chen
doaj   +1 more source

Structural and biochemical analysis of a B12 superbinder

FEBS Letters, EarlyView.
BtuG proteins are vitamin B12 scavengers in Bacteroides thetaiotaomicron, a dominant human gut bacterium. We present crystal structures of three BtuG homologs bound to cobalamin and its precursor cobinamide, revealing picomolar binding affinities, among the highest known for any natural protein.
Jose M. Martinez Felices, Jacob J. Whittaker, Dirk J. Slotboom, Albert Guskov   +3 more
wiley   +1 more source

Effect of combined nitrogen on symbiotic nitrogen fixation in pea plants [PDF]

, 1979
The nitrogen-fixing activity of the symbiotic system of Pisum sativum with Rhizobium leguminosarum is adversely affected by combined nitrogen. Both ammonium chloride and potassium nitrate, when added to the roots, lower the nitrogenase activity ...
Houwaard, F.
core