The study of inorganic nutrients dynamics in shallow sediments usually focuses on two main pools: porewater (PW) nutrients and exchangeable (EX) ammonium and phosphate. Recently, it has been found that microphytobenthos (MPB) and other microorganisms can accumulate large amounts of nutrients intracellularly (IC), highlighting the biogeochemical importance of this nutrient pool. Storing nutrient...

Leaf extracts from twelve chlorophyll-deficient mutants of sweetc10ver (Melilotus alba Desr_) were compared spectrophotometrically and chromatographically with extracts from normal plants to determine contents of chlorophylls a and b_ Total chlorophyll contents in cotyledons and leaves of all mutants were significantly lower than those in corresponding tissues of normal plants_ Chlorophyll cont...

drought stress is the most important factor that reduces yield in crops including chickpea and causes some changes in seed composition. this study was performed in order to evaluate the effects of drought stress and starter nitrogen fertilizer on four cultivars of chickpea. experiment was performed in a split-factorial using randomized complete block design with three replications. drought stre...

With the availability of structural models for photosystem I (PSI) in cyanobacteria and plants it is possible to compare the excitation transfer networks in this ubiquitous photosystem from two domains of life separated by over one billion years of divergent evolution, thus providing an insight into the physical constraints that shape the networks' evolution. Structure-based modeling methods ar...

A set of phytoplankton pigments measurements collected on eight quarterly transects from France to New Caledonia is analyzed, in order to identify the main assemblages of phytoplankton, and to relate their occurrence with oceanic conditions. Pigments concentrations are first divided by the sum monovinyl chlorophyll a plus divinyl chlorophyll a to remove the effect of biomass, and, second, norma...

in order to have a successful breeding program, it is important to determine the relationship among the traits. this study was conducted at research farm of isfahan university of technology to evaluate relationships among some of the agronomic and physiological traits and grain yield of ten bread wheat cultivars in optimum and stress moisture (irrigation after 70±3 and 130±3 mm evaporation from...

Hyperspectral confocal fluorescence imaging provides the opportunity to obtain individual fluorescence emission spectra in small ( approximately 0.03-microm(3)) volumes. Using multivariate curve resolution, individual fluorescence components can be resolved, and their intensities can be calculated. Here we localize, in vivo, photosynthesis-related pigments (chlorophylls, phycobilins, and carote...

Abstract In short-term vegetative experiment studied the effect of different combinations nitrogen and zinc fertilizers on chlorophyll content in leaves spring wheat plants Zlata variety. It is established that application together with most contributed to stabilization synthesis processes grains wheat. shown conditions optimal water supply ecological stress caused by drought were ammonium sulf...

ation of mechanisms that confer photoprotection on *Institute for Plant Sciences plants is particularly important because it may provide Department of Genetics the basis for the construction of new, porphyrin-based Swiss Federal Institute of Technology Zurich (ETH) photobleaching herbicides to be exploited in modern ETH-Zentrum weed control. It is the aim of this review to summarize Universität...