Mollusc Shell Shape as Pollution Biomarkers: What is the Best Biological Model?

2021 ◽  
Author(s):  
Nayara Gouveia ◽  
Cyntia Harayashiki ◽  
Federico Márquez ◽  
Italo B. Castro
Keyword(s):  
Biological Model ◽  
Shell Shape ◽  
Mollusc Shell

Transgender: biological model for steroid action

2016 ◽  
Author(s):  
Ludwig Wildt ◽  
Katharina Winkler-Crepaz ◽  
Bettina Boettcher
Keyword(s):  
Biological Model

scholarly journals Improved hybrid A* path planning method for spherical mobile robot based on pendulum

2021 ◽  
Vol 18 (1) ◽  
pp. 172988142199295
Author(s):  
Ziang Zhang ◽  
Yixu Wan ◽  
You Wang ◽  
Xiaoqing Guan ◽  
Wei Ren ◽  
...  
Keyword(s):  
Mobile Robots ◽  
Common Ground ◽  
Kinematic Model ◽  
Point Contact ◽  
Shell Shape ◽  
Spherical Robot ◽  
Trajectory Tracking Control ◽  
Novel Method ◽  
Turning Radius ◽  
Spherical Mobile Robot

This article proposes a modification of hybrid A* method used for navigation of spherical mobile robots with the ability of limited partial lateral movement driven by pendulum. For pendulum-driven spherical robots with nonzero minimal turning radius, our modification helps to find a feasible and achievable path, which can be followed in line with the low time cost. Because of spherical shell shape, the robot is point contact with the ground, showing different kinematic model compared with common ground mobile robots such as differential robot and wheeled car-like robot. Therefore, this article analyzes the kinematic model of spherical robot and proposes a novel method to generate feasible and achievable paths conforming to kinematic constraints, which can be the initial value of future trajectory tracking control and further optimization. A concept of optimal robot’s minimum area for rotation is also proposed to improve search efficiency and ensure the ability of turning to any orientation by moving forward and backward in a finite number of times within limited areas.

Embryonic shell shape as an early indicator of pollution in marine gastropods

2021 ◽  
Vol 167 ◽  
pp. 105283
Author(s):  
M.A. Primost ◽  
A. Averbuj ◽  
G. Bigatti ◽  
F. Márquez
Keyword(s):  
Shell Shape ◽  
Marine Gastropods ◽  
Early Indicator ◽  
Embryonic Shell

scholarly journals A developmentally descriptive method for quantifying shape in gastropod shells

2020 ◽  
Vol 17 (163) ◽  
pp. 20190721
Author(s):  
J. Larsson ◽  
A. M. Westram ◽  
S. Bengmark ◽  
T. Lundh ◽  
R. K. Butlin
Keyword(s):  
Empirical Studies ◽  
Three Dimensional ◽  
Shell Shape ◽  
Large Set ◽  
Littorina Saxatilis ◽  
Shape Variation ◽  
Gastropod Shell ◽  
Geometric Morphometric ◽  
Wide Range ◽  
Descriptive Method

The growth of snail shells can be described by simple mathematical rules. Variation in a few parameters can explain much of the diversity of shell shapes seen in nature. However, empirical studies of gastropod shell shape variation typically use geometric morphometric approaches, which do not capture this growth pattern. We have developed a way to infer a set of developmentally descriptive shape parameters based on three-dimensional logarithmic helicospiral growth and using landmarks from two-dimensional shell images as input. We demonstrate the utility of this approach, and compare it to the geometric morphometric approach, using a large set of Littorina saxatilis shells in which locally adapted populations differ in shape. Our method can be modified easily to make it applicable to a wide range of shell forms, which would allow for investigations of the similarities and differences between and within many different species of gastropods.

Pleurodeles waltl, amphibian, Urodele, is a suitable biological model for embryological and physiological space experiments on a vertebrate

2001 ◽  
Vol 28 (4) ◽  
pp. 569-578 ◽  
Author(s):  
L. Gualandris-Parisot ◽  
D. Husson ◽  
F. Foulquier ◽  
P. Kan ◽  
J. Davet ◽  
...  
Keyword(s):  
Biological Model ◽  
Space Experiments ◽  
Pleurodeles Waltl

scholarly journals Morphological convergence of shell shape in distantly related scallop species (Mollusca: Pectinidae)

2011 ◽  
Vol 163 (2) ◽  
pp. 571-584 ◽  
Author(s):  
JEANNE M. SERB ◽  
ALVIN ALEJANDRINO ◽  
ERIK OTÁROLA-CASTILLO ◽  
DEAN C. ADAMS
Keyword(s):  
Shell Shape ◽  
Morphological Convergence
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