The object of this study is to evaluate the influence of silymarins from cultivated and wild Silybum marianum L. plants with different content of flavonolignans, especially silibinin on serum lipids levels and on the experimental atherosclerosis development in rabbits fed on high cholesterol-diet (HCD). Forty eight male six-months-old white New Zealand rabbits (1.8-2 kg) were randomly assigne...

In order to evaluate effects of different ratios of ammonium and nitrate, on photosynthesis, respiration and fatty acid composition of canola under conditions of salt stress a greenhouse experiment was conducted in Agriculture Research Center of Eastern Azerbaijan, Iran on 2009. The experimental design was completely randomized design arranged in factorial. The first and second factor included ...

The influence of biological soil crusts (BSCs) on the small-scale spatial distribution of inorganic nitrogen (N) in drylands is largely unknown, despite their known impact and importance on the N cycle in these environments. We evaluated how perennial plants and BSCs affected small-scale spatial patterns of soil inorganic N (ammonium and nitrate) availability in a semiarid grassland from Spain....

In higher plants the glutamate dehydrogenase (GDH) enzyme catalyzes the reversible amination of 2-oxoglutarate to form glutamate, using ammonium as a substrate. For a better understanding of the physiological function of GDH either in ammonium assimilation or in the supply of 2-oxoglutarate, we used transgenic tobacco (Nicotiana tabacum L.) plants overexpressing the two genes encoding the enzym...

Ammonium nutrition often represents an important growth-limiting stress in plants. Some of the symptoms that plants present under ammonium nutrition have been associated with pH deregulation, in fact external medium pH control is known to improve plants ammonium tolerance. However, the way plant cell metabolism adjusts to these changes is not completely understood. Thus, in this work we focused...

Much controversy exists about whether or not NH(+)(4) is translocated in the xylem from roots to shoots. In this paper it is shown that such translocation can indeed take place, but that interference from other metabolites such as amino acids and amines may give rise to large uncertainties about the magnitude of xylem NH(+)(4) concentrations. Elimination of interference requires sample stabiliz...

To date urea and ammonium are two nitrogen (N) forms widely used in agriculture. Due to a low production cost, is the N form most applied However, its stability soil depends on activity of microbial ureases, that operate hydrolysis into ammonium. In subjected fast volatilization ammonia, an environmental loss contributes atmospheric pollution impacts farm economies. Based these considerations, ...

Elevated atmospheric CO2 concentrations (eCO2) has become the main feature and cause of global change that could affect crop growth in many aspects, including physiological processes morphological development plants nutrient cycling uptake from soil. Studying responses to different nitrogen (N) supply forms under elevated can guide management strategies for agricultural production future climat...

Chamaesyce hirta is a troublesome weed in producing regions of Brazil; however, little knownabout the control adult plants. We evaluated plants field. Theexperiment was installed at COACEN, municipality Sorriso - MT, randomized complete block design, withfour replicates. Treatments were arranged split plot factor, where plots received application 19 herbicidesin burndown and subplots sequential...