scholarly journals The exceptional attachment ability of the ectoparasitic bee louse Braula coeca (Diptera, Braulidae) on the honeybee

2021 ◽  
Author(s):  
Thies H. Büscher ◽  
Dennis S. Petersen ◽  
Nienke N. Bijma ◽  
Fabian Bäumler ◽  
Christian W. W. Pirk ◽  
...  
Keyword(s):  
Attachment Ability

Fragmentation, re-attachment ability and growth rate of the Mediterranean black coral Antipathella subpinnata

Coral Reefs ◽  
2019 ◽  
Vol 38 (1) ◽  
pp. 1-14 ◽  
Author(s):  
M. Coppari ◽  
F. Mestice ◽  
F. Betti ◽  
G. Bavestrello ◽  
L. Castellano ◽  
...  
Keyword(s):  
Growth Rate ◽  
Black Coral ◽  
The Mediterranean ◽  
Attachment Ability

Aeromonas salmonicida isolates: Attachment ability and sensitivity to four disinfectants

Food Control ◽  
2018 ◽  
Vol 88 ◽  
pp. 40-46 ◽  
Author(s):  
Jun Qi ◽  
Huawei Wang ◽  
Linlin Cai ◽  
Huhu Wang ◽  
Xinglian Xu ◽  
...  
Keyword(s):  
Aeromonas Salmonicida ◽  
Attachment Ability

Attachment and Biofilm Formation by Various Serotypes of Salmonella as Influenced by Cellulose Production and Thin Aggregative Fimbriae Biosynthesis

2007 ◽  
Vol 70 (11) ◽  
pp. 2473-2479 ◽  
Author(s):  
SUDEEP JAIN ◽  
JINRU CHEN
Keyword(s):  
Food Processing ◽  
Biofilm Formation ◽  
Luria Bertani ◽  
Wild Type ◽  
Cellulose Production ◽  
Processing Equipment ◽  
Abiotic Surfaces ◽  
Glass Surfaces ◽  
Attachment Ability

This study was undertaken to quantify thin aggregative fimbriae and cellulose produced by Salmonella and to evaluate their roles in attachment and biofilm formation on polystyrene and glass surfaces. Thin aggregative fimbriae and cellulose produced by four wild-type and two pairs of Salmonella, representing four different colony morphotypes (rdar: red, dry, and rough; pdar: pink, dry, and rough; bdar: brown, dry, and rough; and saw: smooth and white), were quantified. The ability of the Salmonella cells to attach and form biofilms on the selected surfaces was evaluated in Luria-Bertani (LB) broth with or without salt (0.5%) or glucose (2%) at 28°C during a 7-day period. The cells expressing the rdar or pdar colony morphotypes produced significantly greater amounts of thin aggregative fimbriae and cellulose on LB no salt agar, respectively. The cells expressing the rdar colony morphotype attached in higher numbers and formed more biofilm than did the cells expressing the pdar colony morphotype. The members of the pairs expressing the bdar colony morphotype attached more efficiently and formed more biofilm on the tested surfaces than did their counterparts expressing the saw colony morphotype. These results indicated that thin aggregative fimbriae impart attachment ability to Salmonella and, upon coexpression with cellulose, enhance biofilm formation on certain abiotic surfaces. The knowledge acquired in the study may help develop better cleaning strategies for food processing equipment.

Effect of Growth Nutrients on Attachment of Listeria monocytogenes To Stainless Steel

1994 ◽  
Vol 57 (8) ◽  
pp. 720-724 ◽  
Author(s):  
KWANG Y. KIM ◽  
JOSEPH F. FRANK
Keyword(s):  
Stainless Steel ◽  
Listeria Monocytogenes ◽  
Cell Surface ◽  
Minimal Medium ◽  
Cell Attachment ◽  
Chloride Concentration ◽  
Fold Increase ◽  
Hydrolyzed Protein ◽  
Steel Surfaces ◽  
Attachment Ability

Listeria monocytogenes cells grown in chemically defined minimal medium (D10), tryptic soy broth (TSB), and modifications of these media were used to determine the effect of growth nutrients on attachment ability. Stainless steel surfaces were submerged in various cell suspensions at 21°C for 4 h, and the numbers of attached cells were compared. Cells grown in D10 showed approximately 50-fold higher attachment than those grown in TSB. Addition of components of D10 to TSB did not affect the attachment ability of cells grown in TSB. The only modifications of D10, which affected attachment ability were a 10-fold increase of ammonium chloride concentration and a 1/10 reduction in iron, both of which resulted in decreases in attachment ability to one third of the D10 control. Replacement of glucose in D10 with mannose, cellobiose, fructose or trehalose did not effect cell attachment. Replacement of nitrogen components in D10 with tryptone decreased cell attachment to the equivalent level of cells grown in TSB. The reduced attachment ability of TSB-grown cells was not the result of hydrolyzed protein absorbing to the cell surface.

scholarly journals Insect wet steps: loss of fluid from insect feet adhering to a substrate

2013 ◽  
Vol 10 (78) ◽  
pp. 20120639 ◽  
Author(s):  
Alexander E. Kovalev ◽  
Alexander E. Filippov ◽  
Stanislav N. Gorb
Keyword(s):  
Surface Roughness ◽  
Fluid Flows ◽  
Solid Substrate ◽  
Fluid Loss ◽  
Adhesion Forces ◽  
Roughness Parameters ◽  
Fluid Absorption ◽  
Remarkable Effect ◽  
Adhesive Pads ◽  
Attachment Ability

Reliable attachment ability of insect adhesive pads is proposed to be due to pad secretion. It has been shown that surface roughness strongly reduces adhesion forces of insect pads. This effect has been explained by decreased contact area and rapid fluid absorption from the pad surface by rough surfaces. However, it remains unclear how the fluid flows on rough substrates having different roughness parameters and surface energy. In this paper, we numerically studied the fluid flow on rough substrates during contact formation. The results demonstrate that an increase in the density of the substrate structures leads to an increase in fluid loss from the pad: substrates with a fine roughness absorb pad fluid faster. Decreased affinity of the solid substrate to the fluid has a more remarkable effect on the fluid loss and leads to a decrease in the fluid loss. With an increase in the aspect ratio of the substrate irregularities (porosity), the fluid loss is decreased. The numerical results obtained agree well with previous observations on insects and experimental results on nanoporous substrata. The significance of the obtained results for understanding biological wet adhesives is discussed.

scholarly journals The effect of surface anisotropy in the slippery zone of Nepenthes alata pitchers on beetle attachment

2011 ◽  
Vol 2 ◽  
pp. 302-310 ◽  
Author(s):  
Elena V Gorb ◽  
Stanislav N Gorb
Keyword(s):  
Coccinella Septempunctata ◽  
Carnivorous Plant ◽  
Surface Anisotropy ◽  
Anisotropic Properties ◽  
Surface Samples ◽  
Ladybird Beetles ◽  
Attachment Ability ◽  
Wax Crystals ◽  
Insect Attachment ◽  
Effect Of Surface

The slippery zone in pitchers of the carnivorous plant Nepenthes alata bears scattered prominent lunate cells and displays continuous epicuticular crystalline wax coverage. The aim of this study was to examine the influence of the surface anisotropy, caused by the shape of lunate cells, on insect attachment ability. Traction tests with ladybird beetles Coccinella septempunctata were performed in two types of experiments, where surface samples of (1) intact pitchers, (2) chemically de-waxed pitchers, and (3) their polymer replicas were placed horizontally. Beetle traction forces were measured when they walked on test surfaces in either an upward (towards the peristome) or downward (towards the pitcher bottom) direction, corresponding to the upright or inverted positions of the pitcher. On intact pitcher surfaces covered with both lunate cells and wax crystals, experiments showed significantly higher forces in the direction towards the pitcher bottom. To distinguish between the contributions, from claw interlocking and pad adhesion, to insect attachment on the pitcher surfaces, intact versus claw-ablated beetles were used in the second type of experiment. On both de-waxed plant samples and their replicas, intact insects generated much higher forces in the downward direction compared to the upward one, whereas clawless insects did not. These results led to the conclusion that, (i) due to the particular shape of lunate cells, the pitcher surface has anisotropic properties in terms of insect attachment, and (ii) claws were mainly responsible for attachment enhancement in the downward pitcher direction, since, in this direction, they could interlock with overhanging edges of lunate cells.

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