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Beardall, John,Sobrino, Cristina,Stojkovic, Slobodanka Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.9
It is well known that UV radiation can cause deleterious effects to the physiological performance, growth and species assemblages of marine primary producers. In this review we describe the range of interactions observed between these impacts of ultraviolet radiation (UVR, 280-400 nm) with other environmental factors such as the availability of photosynthetically active radiation (PAR), nutrient status and levels of dissolved $CO_2$, all of which can, in turn, be influenced by global climate change. Thus, increases in $CO_2$ levels can affect the sensitivity of some species to UV-B radiation (UV-B), while others show no such impact on UV-B susceptibility. Both nitrogen- and phosphorus-limitation can have direct interactive effects on the susceptibility of algal cells and communities to UVR, though such effects are somewhat variable. Nutrient depletion can also potentially lead to a dominance of smaller celled species, which may be less able to screen out and are thus likely to be more susceptible to UVR-induced damage. The variability of responses to such interactions can lead to alterations in the species composition of algal assemblages.
Giordano, Mario,Norici, Alessandra,Beardall, John The Korean Society of Phycology 2017 ALGAE Vol.32 No.2
Fourier Transform Infrared (FTIR) spectroscopy was used to study carbon allocation patterns in response to N-starvation in the nearly ubiquitous diatom Chaetoceros muellerii. The role of gene expression, protein synthesis and transamination on the organic composition of cells was tested by using specific inhibitors. The results show that inhibition of key processes in algal metabolism influence the macromolecular composition of cells and and prior cell nutritional state can influence a cell's response to changing nutrient availability. The allocation of C can thus lead to different organic composition depending on the nutritional context, with obvious repercussions for the trophic web. This also shows that C allocation in algal cells is highly flexible and that C (and the energy associated with its allocation) can be variably and rapidly partitioned in algal cells in response to relatively short term perturbations. Furthermore, the data confirm and extend the utility of infrared spectroscopy as a probe of the metabolic state of autotrophic cells.
Mario Giordano,Alessandra Norici,John Beardall 한국조류학회I 2017 ALGAE Vol.32 No.2
Fourier Transform Infrared (FTIR) spectroscopy was used to study carbon allocation patterns in response to N-starvationin the nearly ubiquitous diatom Chaetoceros muellerii. The role of gene expression, protein synthesis and transaminationon the organic composition of cells was tested by using specific inhibitors. The results show that inhibitionof key processes in algal metabolism influence the macromolecular composition of cells and and prior cell nutritionalstate can influence a cell’s response to changing nutrient availability. The allocation of C can thus lead to different organiccomposition depending on the nutritional context, with obvious repercussions for the trophic web. This also shows thatC allocation in algal cells is highly flexible and that C (and the energy associated with its allocation) can be variably andrapidly partitioned in algal cells in response to relatively short term perturbations. Furthermore, the data confirm andextend the utility of infrared spectroscopy as a probe of the metabolic state of autotrophic cells.