Thermodynamic Basis of Molecular Diffusion through Cyanobacterial Septal Junctions
نویسندگان
چکیده
A recent paper published by Nieves-Morión and colleagues proposes that the intercellular transfer of small molecules in heterocyst-forming cyanobacteria (calcein, 5-carboxyfluorescein [5-CF], and esculin) is mediated by simple diffusion based on the Q10 values of the kinetics (1). In this letter, we show our analysis of their results to provide a thermodynamic basis of the kinetics. We obtained rate constant values of the intercellular transfer for those molecules from Fig. 1 of the original paper (1) using the ImageJ program (https://imagej.nih.gov/ ij/). We calculated molar free energy of activation (ΔGa°) for each molecule at each temperature (T) using the Eyring equation (equation 1) from the corresponding rate constant (k):
منابع مشابه
Molecular Diffusion through Cyanobacterial Septal Junctions
Heterocyst-forming cyanobacteria grow as filaments in which intercellular molecular exchange takes place. During the differentiation of N2-fixing heterocysts, regulators are transferred between cells. In the diazotrophic filament, vegetative cells that fix CO2 through oxygenic photosynthesis provide the heterocysts with reduced carbon and heterocysts provide the vegetative cells with fixed nitr...
متن کاملIdentification and toxigenic potential of a cyanobacterial strain (Stigomena sp.)
Cyanobacteria are well known for their production of a multitude of highly toxic substances . The genus Stigomena is regarded as good candidates for producing biologically active secondary metabolites, which are highly toxic to humans and other animals. The carcass of a dog was found at the shore of Lake Ali-Abad, Iran. Biomass from the discovery site appeared to be of cyanobacterial nature. We...
متن کاملModeling of Manufacturing of Field-Effect Heterotransistors without P-n-junctions to Optimize Decreasing their Dimensions
It has been recently shown that manufacturing p-n-junctions, field-effect and bipolar transistors, thyristors in a multilayer structure by diffusion or ion implantation with the optimization of dopant and/or radiation defects leads to increase the sharpness of p-n-junctions (both single p-n-junctions and p-n-junctions framework their system). Due to the optimization, one can also obtain increas...
متن کاملMolecular analysis of connexin 40 in the familial form of atrial fibrillation.
Atrial fibrillation (AF) is the most common sustained cardiac rhythm disturbance. Sixteen percent of the male population that are affected with AF suffer from the familial form (FAF) for which the molecular basis is still unknown. Cardiac conduction disturbances and block are due either to changes of ionic channel properties (essentially sodium channels, INa), myocardial architecture or interce...
متن کاملTaxonomic survey of cyanobacteria of Urmia Lake (NW Iran) and their adjacent ecosystems based on morphological and molecular methods
In the present study, the cyanobacterial flora of Urmia Lake (NW Iran), one of the largest salt lakes in the world and adjacent rivers is investigated. Urmia Lake comprises different micro-organisms including cyanobacteria which have a major role in aquatic ecosystems. Cyanobacterial samples were collected in 2008–09 from Urmia Lake and its surrounding ecosystems. All samples were cultivated, i...
متن کامل