Description of the Tadpole of Bufo rufus with Notes on Aggregative Behavior

1999 ◽  
Vol 33 (4) ◽  
pp. 711 ◽  
Author(s):  
Paula Cabral Eterovick ◽  
Ivan Sazima
Keyword(s):  
Aggregative Behavior

scholarly journals Detecting the Mechanism behind the Transition from Fixed Two-Dimensional Patterned Sika Deer (Cervus nippon) Dermal Papilla Cells to Three-Dimensional Pattern

2021 ◽  
Vol 22 (9) ◽  
pp. 4715
Author(s):  
Guanning Wei ◽  
Hongmei Sun ◽  
Haijun Wei ◽  
Tao Qin ◽  
Yifeng Yang ◽  
...  
Keyword(s):  
Culture Condition ◽  
Sika Deer ◽  
Three Dimensional ◽  
Cervus Nippon ◽  
Dermal Papilla ◽  
Growth Patterns ◽  
The Self ◽  
Dermal Papilla Cells ◽  
Aggregative Behavior ◽  
Cell Pattern

The hair follicle dermal papilla is critical for hair generation and de novo regeneration. When cultured in vitro, dermal papilla cells from different species demonstrate two distinguishable growth patterns under the conventional culture condition: a self-aggregative three dimensional spheroidal (3D) cell pattern and a two dimensional (2D) monolayer cell pattern, correlating with different hair inducing properties. Whether the loss of self-aggregative behavior relates to species-specific differences or the improper culture condition remains unclear. Can the fixed 2D patterned dermal papilla cells recover the self-aggregative behavior and 3D pattern also remains undetected. Here, we successfully constructed the two growth patterns using sika deer (Cervus nippon) dermal papilla cells and proved it was the culture condition that determined the dermal papilla growth pattern. The two growth patterns could transit mutually as the culture condition was exchanged. The fixed 2D patterned sika deer dermal papilla cells could recover the self-aggregative behavior and transit back to 3D pattern, accompanied by the restoration of hair inducing capability when the culture condition was changed. In addition, the global gene expressions during the transition from 2D pattern to 3D pattern were compared to detect the potential regulating genes and pathways involved in the recovery of 3D pattern and hair inducing capability.

scholarly journals Regulated aggregative multicellularity in a close unicellular relative of metazoa

eLife ◽  
2013 ◽  
Vol 2 ◽  
Author(s):  
Arnau Sebé-Pedrós ◽  
Manuel Irimia ◽  
Javier del Campo ◽  
Helena Parra-Acero ◽  
Carsten Russ ◽  
...  
Keyword(s):  
Life Cycle ◽  
Alternative Splicing ◽  
Splicing Regulation ◽  
Tissue Architecture ◽  
Genetic Changes ◽  
Aggregative Behavior ◽  
History Of

The evolution of metazoans from their unicellular ancestors was one of the most important events in the history of life. However, the cellular and genetic changes that ultimately led to the evolution of multicellularity are not known. In this study, we describe an aggregative multicellular stage in the protist Capsaspora owczarzaki, a close unicellular relative of metazoans. Remarkably, transition to the aggregative stage is associated with significant upregulation of orthologs of genes known to establish multicellularity and tissue architecture in metazoans. We further observe transitions in regulated alternative splicing during the C. owczarzaki life cycle, including the deployment of an exon network associated with signaling, a feature of splicing regulation so far only observed in metazoans. Our results reveal the existence of a highly regulated aggregative stage in C. owczarzaki and further suggest that features of aggregative behavior in an ancestral protist may had been co-opted to develop some multicellular properties currently seen in metazoans.

scholarly journals Aggregative Behavior of Bacteria Isolated from Canine Dental Plaque

2006 ◽  
Vol 72 (8) ◽  
pp. 5211-5217 ◽  
Author(s):  
David R. Elliott ◽  
Michael Wilson ◽  
Catherine M. F. Buckley ◽  
David A. Spratt
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Dental Plaque ◽  
Oral Bacteria ◽  
Surface Structures ◽  
Aggregative Behavior ◽  
Transmission Electron

ABSTRACT Interbacterial adhesion of bacteria isolated from canine dental plaque was assessed by performing a visual coaggregation assay. Using conditions mimicking those likely to be encountered in vivo, the entire cultivable plaque microbiota from a single dog was assessed, and eight (6.7%) unique coaggregation interactions were detected for 120 crosses. Transmission electron microscopy was used to visualize several of the bacteria in isolation and as coaggregates, which revealed surface structures that may be involved in adhesion and coaggregation. The results of this study indicate that the prevalence of coaggregating pairs of dental plaque bacteria in dogs is similar to the prevalence of coaggregating pairs of dental plaque bacteria reported in humans. In addition, genera found in both hosts generally exhibited similar coaggregation reactions; however, autoaggregation was found to be more common among oral bacteria isolated from dogs.

Gregarious aggregative behavior in the marine isopodCirolana harfordi

2016 ◽  
Vol 135 (3) ◽  
pp. 225-234 ◽  
Author(s):  
Umme Salma ◽  
Murray Thomson
Keyword(s):  
Aggregative Behavior

The aggregative behavior of hydrophobically modified chitosans with high substitution degree in aqueous solution

2008 ◽  
Vol 74 (1) ◽  
pp. 16-22 ◽  
Author(s):  
Ornella Ortona ◽  
Gerardino D’Errico ◽  
Gaetano Mangiapia ◽  
Donato Ciccarelli
Keyword(s):  
Aqueous Solution ◽  
Aggregative Behavior ◽  
Hydrophobically Modified ◽  
Substitution Degree

Modeling the aggregative behavior of ants of the species Polyergus rufescens

2000 ◽  
Vol 1 (1) ◽  
pp. 163-176 ◽  
Author(s):  
Silvia Boi ◽  
Vincenzo Capasso ◽  
Daniela Morale
Keyword(s):  
Aggregative Behavior ◽  
Polyergus Rufescens

Ternary copolymers of acrylic acid, N-isopropylacrylamide, and butyl acrylate: Synthesis and aggregative behavior in dilute solutions

2016 ◽  
Vol 58 (5) ◽  
pp. 564-573 ◽  
Author(s):  
E. V. Chernikova ◽  
A. V. Plutalova ◽  
K. O. Mineeva ◽  
D. V. Vishnevetskii ◽  
E. A. Lysenko ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Butyl Acrylate ◽  
Dilute Solutions ◽  
Aggregative Behavior
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