Results 31 to 40 of about 1,110,939 (298)

Bacterial nitrate assimilation: gene distribution and regulation [PDF]

open access: yes, 2011
In the context of the global nitrogen cycle, the importance of inorganic nitrate for the nutrition and growth of marine and freshwater autotrophic phytoplankton has long been recognized.
Andrew J. Gates   +44 more
core   +1 more source

The Role of N2 as a Geo-Biosignature for the Detection and Characterization of Earth-like Habitats [PDF]

open access: yes, 2019
Since the Archean, N2 has been a major atmospheric constituent in Earth's atmosphere. Nitrogen is an essential element in the building blocks of life, therefore the geobiological nitrogen cycle is a fundamental factor in the long term evolution of both ...
Cubillos, Patricio E.   +6 more
core   +2 more sources

Titan's past and future: 3D modeling of a pure nitrogen atmosphere and geological implications

open access: yes, 2014
Several clues indicate that Titan's atmosphere has been depleted in methane during some period of its history, possibly as recently as 0.5-1 billion years ago. It could also happen in the future.
Charnay, Benjamin   +4 more
core   +3 more sources

Nitrogen: from discovery, plant assimilation, sustainable usage to current enhanced efficiency fertilizers technologies – A review [PDF]

open access: yesRevista Brasileira de Ciência do Solo
From 1913 onwards, the global situation changed from a scenario of nitrogen (N) scarcity to an abundance of ammonia (NH3) produced synthetically via the Haber-Bosch process.
Bruno Maia Abdo Rahmen Cassim   +6 more
doaj   +1 more source

Polyester microplastic fibers in soil increase nitrogen loss via leaching and decrease plant biomass production and N uptake

open access: yesEnvironmental Research Letters, 2022
Microplastic contamination, like other global change factors, can induce effects on ecosystem functions and processes, affecting various soil biophysical properties.
Rosolino Ingraffia   +5 more
doaj   +1 more source

Ratio of natural isotopes of nitrogen. I. Primary results: soils of Dombes [Translation from: Revue d'Ecologie et de Biologie du Sol 14, 279-287, 1977] [PDF]

open access: yes, 1980
Utilization of the heavy isotope of nitrogen as a tracer has found numerous applications in soil biology. It allows better definition of different stages of the nitrogen cycle, in particular the immobilization-mineralization cycle.
Chalamet, A.   +2 more
core  

An upstream open reading frame regulates expression of the mitochondrial protein Slm35 and mitophagy flux

open access: yesFEBS Letters, EarlyView.
This study reveals how the mitochondrial protein Slm35 is regulated in Saccharomyces cerevisiae. The authors identify stress‐responsive DNA elements and two upstream open reading frames (uORFs) in the 5′ untranslated region of SLM35. One uORF restricts translation, and its mutation increases Slm35 protein levels and mitophagy.
Hernán Romo‐Casanueva   +5 more
wiley   +1 more source

Nitric Oxide Isotopic Analyzer Based on a Compact Dual-Modulation Faraday Rotation Spectrometer

open access: yesSensors, 2015
We have developed a transportable spectroscopic nitrogen isotopic analyzer. The spectrometer is based on dual-modulation Faraday rotation spectroscopy of nitric oxide isotopologues with near shot-noise limited performance and baseline-free operation ...
Eric Zhang   +7 more
doaj   +1 more source

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

open access: yesNitrogen, 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   +5 more
doaj   +1 more source

Anthropogenic nitrogen autotrophy and heterotrophy of the world's watersheds: Past, present, and future trends [PDF]

open access: yes, 2010
Anthropogenic nitrogen autotrophy of a territory is defined as the nitrogen flux associated with local production of harvested crops and grass consumed by livestock grazing (in kg N/km(2)/yr).
Beusen, A.   +3 more
core   +3 more sources

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