نتایج جستجو برای: nitrogen clusters

تعداد نتایج: 231168  

2016
Justin S. J. Hargreaves Richard A. Catlow

Cobalt molybdenum nitride (Co3Mo3N) is one of the most active catalysts for ammonia synthesis, although the atomistic details of the reaction mechanism are currently unknown. We present a dispersioncorrected (D3) DFT study of the adsorption and activation of molecular nitrogen and hydrogen on Co3Mo3N-(111) surfaces to identify possible activation sites for ammonia synthesis. H2 was found to ads...

2013
Christoph Zutz Agnieszka Gacek Michael Sulyok Martin Wagner Joseph Strauss Kathrin Rychli

The filamentous fungus Aspergillus clavatus is known to produce a variety of secondary metabolites (SM) such as patulin, pseurotin A, and cytochalasin E. In fungi, the production of most SM is strongly influenced by environmental factors and nutrients. Furthermore, it has been shown that the regulation of SM gene clusters is largely based on modulation of a chromatin structure. Communication be...

Hassanali Aghajani Kazem Ravanestan

Clusters are geographically close groups of related companies or institutions related to a certain area which are inherently more efficient than the other companies due to advantages such as being located in one place, networks, external knowledge, variability of human capital, etc. Today, development through clusters plays a pivotal role in the economic and industrial policies of developed...

Journal: :International journal of clinical and experimental pathology 2015
Yibing Wang Chao Hao Bin Fu Weipeng Liu Xiaocheng Zhou Tao Zeng Ju Guo Gongxian Wang

Epidemiological and histopathological studies have indicated that proliferative inflammatory atrophy (PIA) of the prostate is closely associated with the onset and development of prostate cancer (PCa). However, accurate isolation of PIA still remains a difficult matter, as well as high-quality RNA extraction from isolated PIA. These issues generated a lack of molecular evidence to support the m...

2017
Damaris K Ondieki Evans N Nyaboga John M Wagacha Francis B Mwaura

Limited nitrogen (N) content in the soil is a major challenge to sustainable and high crop production in many developing countries. The nitrogen fixing symbiosis of legumes with rhizobia plays an important role in supplying sufficient N for legumes and subsequent nonleguminous crops. To identify rhizobia strains which are suitable for bioinoculant production, characterization of rhizobia is a p...

2003
Sandra Regina Ceccato-Antonini Paula Cristina da Silva

Yeasts can produce pseudohyphae and hyphal-like extensions under certain growth conditions like isoamyl alcohol (IAA) induction, a chief constituent of fusel oil, which is a subproduct from the ethanolic fermentation. The morphology switch from yeast to a filamentous form can be troublesome to the process. In this work it was studied the influence of fusel alcohols, nitrogen sources (ammonium s...

2017
Jie Wang Xiaoling Dun Jiaqin Shi Xinfa Wang Guihua Liu Hanzhong Wang

As the major determinant for nutrient uptake, root system architecture (RSA) has a massive impact on nitrogen use efficiency (NUE). However, little is known the molecular control of RSA as related to NUE in rapeseed. Here, a rapeseed recombinant inbred line population (BnaZNRIL) was used to investigate root morphology (RM, an important component for RSA) and NUE-related traits under high-nitrog...

1999
E. Liu

The mechanical properties of both undoped and nitrogen containing tetrahedral amorphous carbon (ta-C and ta-C:N ) films, such as hardness and E-modulus, are investigated. The mechanical properties are related to the film structures. The ta-C and ta-C:N films are prepared in a filtered cathodic vacuum arc process. Nanoindentation testing is used to measure the mechanical properties of these film...

2007
Karolina Bauer

Discoveries in recent years have disclosed the importance of marine cyanobacteria in the context of primary production and global nitrogen cycling. It is hypothesized here that microbial mats in tropical coastal habitats harbour a rich diversity of previously uncharacterized cyanobacteria and that benthic marine nitrogen fixation in coastal zones is substantial. A polyphasic approach was used t...

1991
B. Shirinzadeh M. E. Hillard A. B. Blair R. J. Exton

Using a frequency-doubled Nd-YAG pulsed laser and a single-intensified CCD camera, Rayleigh scattering measurements have been performed to study the cluster formation in a Mach 6 wind tunnel at NASA Langley Research Center. These studies were conducted both in the free stream and in a model flow field for various flow conditions to gain an understanding of the dependence of the Rayleigh scatter...

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