scholarly journals Physical Non-Contact Communication between Microscopic Aquatic Species: Novel Experimental Evidences for an Interspecies Information Exchange

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Daniel Fels
Keyword(s):  
Electromagnetic Fields ◽  
Information Exchange ◽  
Optical Spectrum ◽  
Proliferation Rate ◽  
Aquatic Species ◽  
Paramecium Caudatum ◽  
Unicellular Organism ◽  
Unicellular Organisms

Previous experiments on physical non-contact communication within same species gave rise to test for this type of communication also across the species border, which was the aim of the present study. It was found that autotrophic unicellular organisms (Euglena viridis), separated by cuvettes, affected the proliferation rate of heterotrophic unicellular organisms (Paramecium caudatum). Further, the heterotrophic unicellular organism affected also the proliferation rate of a multicellular heterotrophic organism (Rotatoria sp.) and vice versa. In the case when populations (of Euglena viridis and Paramecium caudatum) were shielded against electromagnetic fields in the optical spectrum from each other, no effects were measured. The results may support the notion that the organisation of ecosystems relies also on the exchange of electromagnetic fields from their constituting biosystems.

scholarly journals Phenotypic variability predicts decision accuracy in unicellular organisms

2019 ◽  
Vol 286 (1896) ◽  
pp. 20182825 ◽  
Author(s):  
Audrey Dussutour ◽  
Qi Ma ◽  
David Sumpter
Keyword(s):  
Phenotypic Variability ◽  
Sampling Time ◽  
Exploratory Behaviour ◽  
Food Sources ◽  
Food Cues ◽  
Unicellular Organism ◽  
Decision Accuracy ◽  
Slime Moulds ◽  
Behavioural Types ◽  
Unicellular Organisms

When deciding between different options, animals including humans face the dilemma that fast decisions tend to be erroneous, whereas accurate decisions tend to be relatively slow. Recently, it has been suggested that differences in the efficacy with which animals make a decision relate closely to individual behavioural differences. In this paper, we tested this hypothesis in a unique unicellular organism, the slime mould Physarum polycephalum . We first confirmed that slime moulds differed consistently in their exploratory behaviour from ‘fast’ to ‘slow’ explorers. Second, we showed that slow explorers made more accurate decisions than fast explorers. Third, we demonstrated that slime moulds integrated food cues in time and achieved higher accuracy when sampling time was longer. Lastly, we showed that in a competition context, fast explorers excelled when a single food source was offered, while slow explorers excelled when two food sources varying in quality were offered. Our results revealed that individual differences in accuracy were partly driven by differences in exploratory behaviour. These findings support the hypothesis that decision-making abilities are associated with behavioural types, even in unicellular organisms.

The effect of electromagnetic fields on survival and proliferation rate of dental pulp stem cells

2020 ◽  
Vol 78 (7) ◽  
pp. 494-500 ◽  
Author(s):  
Mohammad Samiei ◽  
Zahra Aghazadeh ◽  
Elaheh Dalir Abdolahinia ◽  
Amin Vahdati ◽  
Sabalan Daneshvar ◽  
...  
Keyword(s):  
Stem Cells ◽  
Electromagnetic Fields ◽  
Dental Pulp ◽  
Dental Pulp Stem Cells ◽  
Proliferation Rate

scholarly journals Phenotypic variability in unicellular organisms: from calcium signalling to social behaviour

2015 ◽  
Vol 282 (1819) ◽  
pp. 20152322 ◽  
Author(s):  
David Vogel ◽  
Stamatios C. Nicolis ◽  
Alfonso Perez-Escudero ◽  
Vidyanand Nanjundiah ◽  
David J. T. Sumpter ◽  
...  
Keyword(s):  
Social Interactions ◽  
Phenotypic Variability ◽  
Cell Signalling ◽  
Calcium Signalling ◽  
Social Strategies ◽  
Unicellular Organism ◽  
Unicellular Organisms ◽  
Behavioural Phenotypes ◽  
The Mean ◽  
Living Organisms

Historically, research has focused on the mean and often neglected the variance. However, variability in nature is observable at all scales: among cells within an individual, among individuals within a population and among populations within a species. A fundamental quest in biology now is to find the mechanisms that underlie variability. Here, we investigated behavioural variability in a unique unicellular organism, Physarum polycephalum . We combined experiments and models to show that variability in cell signalling contributes to major differences in behaviour underpinning some aspects of social interactions. First, following thousands of cells under various contexts, we identified distinct behavioural phenotypes: ‘slow–regular–social’, ‘fast–regular–social’ and ‘fast–irregular–asocial’. Second, coupling chemical analysis and behavioural assays we found that calcium signalling is responsible for these behavioural phenotypes. Finally, we show that differences in signalling and behaviour led to alternative social strategies. Our results have considerable implications for our understanding of the emergence of variability in living organisms.

Effect of pulsed electromagnetic fields on maturation of regenerate bone in a rabbit limb lengthening model

2005 ◽  
Vol 24 (1) ◽  
pp. 2-10 ◽  
Author(s):  
Kenneth F. Taylor ◽  
Nozumu Inoue ◽  
Bahman Rafiee ◽  
John E. Tis ◽  
Kathleen A. McHale ◽  
...  
Keyword(s):  
Electromagnetic Fields ◽  
Limb Lengthening ◽  
Pulsed Electromagnetic Fields ◽  
Pulsed Electromagnetic

Effects of 60 Hz Electromagnetic Fields on Melatonin and Sleep in Rats

2001 ◽  
Author(s):  
Jeff Dyche ◽  
Michael Morrissey ◽  
Eric Powell ◽  
A. Michael Anch
Keyword(s):  
Electromagnetic Fields
Sign in / Sign up

Export Citation Format

Share Document