The number of bone marrow fibroblast colony formations decreases in most cases of acute leukemia before the initiation of chemotherapy. This study was undertaken to clarify the mechanism of suppression of fibroblast colony formation in leukemic patients. Titration of the number of bone marrow cells did not indicate a linear relationship between the number of bone marrow cells cultured and the n...

Colony formation in marine phytoplankton can be modified by the presence of grazers, but effect colony size and shape on feeding behavior grazers is still relatively unknown. To explore defensive role formation, we examined response three differently sized (copepodites, copepod nauplii, two heterotrophic dinoflagellates) colony-forming phytoplankton, using both direct video observations bottle ...

Various studies have shown that the ant colony optimization (ACO) algorithm has a good performance in approximating complex combinatorial problems such as traveling salesman problem (TSP) for real-world applications. However, disadvantages long running time and easy stagnation still restrict its further wide application many fields. In this study, saltatory evolution (SEACO) is proposed to incr...

The Santa Teresa Colony, in São Pedro de Alcântara, State of Catarina, inaugurated 1940, was built accordance with the national legislation that required compulsory hospitalization lepers, pharmacotherapy and occupational therapy. In this article, we address aspects prior proposals agreement between federal state governments culminated building institution Catarina. We discuss medical prescript...

To understand how the mechanical properties of tissues emerge from interactions of multiple cells, we measure traction stresses of cohesive colonies of 1-27 cells adherent to soft substrates. We find that traction stresses are generally localized at the periphery of the colony and the total traction force scales with the colony radius. For large colony sizes, the scaling appears to approach lin...

Since the ant colony algorithm is proposed, it has achieved the remarkable achievements in many fields. With the development of the times, the traditional ant colony algorithm exposes its limitations for solving the questions. In this paper, we improve the ant colony algorithm. And we combine the ant colony algorithm with the genetic algorithm. Then, we propose the GAPSPAC algorithm. The algori...

Insect societies have evolved ways of policing selfish behaviour that arises due to genetic conflicts within the colony. A new case of policing in an ant where colony members are genetically identical highlights the role of colony economics for policing.

This study addressed how collective, supra-organismal colony characteristics change during growth (sociogenesis) from the founding queen to maturity and through the seasons. A total of 31 harvester ant colonies representing a full range of sizes was excavated on 4 sample dates during the year. The data were analyzed for growth-related and seasonal patterns. The subterranean nests consisted of h...

Ant colony optimization and artificial potential field were used respectively as global path planning and local path planning methods in this paper. Some modifications were made to accommodate ant colony optimization to path planning. Pheromone generated by ant colony optimization was also utilized to prevent artificial potential field from getting local minimum. Simulation results showed that ...