A Note on the Circulus as an Adhesive Organ in Some Pseudococcidae

1957 ◽  
Vol 89 (1) ◽  
pp. 46-48 ◽  
Author(s):  
D. C. Lloyd ◽  
Eula Martini
Keyword(s):  
Rhodnius Prolixus ◽  
Adhesive Organ ◽  
Unusual Type

Adhesive or climbing organs in the form of empodia or pulvilli between the tarsal claws are common structures in Hymenoptera, Diptera, Hemiptera and other orders (Weber 1933). A more unusual type consisting of a small oval sac on the distal end of the tibia of the prothoracic and metathoracic legs of the reduviid Rhodnius prolixus Stål. has been described by Gillett and Wigglesworth (1932).

The Dermal Glands of Rhodnius Prolixus

1969 ◽  
Vol 27 ◽  
pp. 258-259
Author(s):  
J. E. Lai-Fook
Keyword(s):  
Fine Structure ◽  
Secretory Activity ◽  
Rhodnius Prolixus ◽  
Outermost Layer ◽  
Cement Layer ◽  
Dermal Glands

Dermal glands are epidermal derivatives which are reported to secrete either the cement layer, which is the outermost layer of the epicuticle or some component of the moulting fluid which digests the endocuticle. The secretions do not show well-defined staining reactions and therefore they have not been positively identified. This has contributed to another difficulty, namely, that of determining the time of secretory activity. This description of the fine structure of the developing glands in Rhodnius was undertaken to determine the time of activity, with a view to investigating their function.

An unusual type of salmonella causing enteric fever

Pathology ◽  
1969 ◽  
Vol 1 (3) ◽  
pp. 221-224
Author(s):  
D.E.M. Taylor ◽  
G.E. Eves
Keyword(s):  
Enteric Fever ◽  
Unusual Type

Ultrastructural Characterization of Malpighian Tubules of Rhodnius prolixus During the Insect's Feeding Cycle and Under Hyperosmotic Shock

2020 ◽  
Vol 129 (2) ◽  
pp. 189
Author(s):  
Jacenir Reis dos Santos-Mallet ◽  
Simone Patrícia Carneiro Freitas ◽  
Maria Luiza Ribeiro de Oliveira ◽  
Alice Helena Ricardo-Silva ◽  
Aníbal Gil Lopes ◽  
...  
Keyword(s):  
Rhodnius Prolixus ◽  
Malpighian Tubules ◽  
Hyperosmotic Shock ◽  
Ultrastructural Characterization ◽  
Feeding Cycle

Análisis genómico y molecular de la embriogénesis de Rhodnius prolixus (Stähl, 1859) (Hemíptera, Reduviidae): implicancias morfológico-evolutivas en insectos

2012 ◽  
Author(s):  
◽  
Lucía Elena Pagola
Keyword(s):  
Drosophila Melanogaster ◽  
Rhodnius Prolixus

Todos los animales que poseen simetría bilateral se encuentran definidos por dos ejes de simetría ortogonales, el eje anteroposterior (A-P) que corre de la boca al ano y un eje perpendicular a este, el eje dorsoventral (D-V). A pesar de la gran variedad de modos de desarrollo embrionario y formas finales encontradas en los animales, las redes regulatorias y factores de transcripción que dan origen a estos ejes se encuentran muy conservados. De aquí surge una pregunta central, cómo estas redes regulatorias tan conservadas crean tanta diversidad morfológica, se adaptan a nuevos ambientes y de qué manera las novedades evolutivas se incorporan en un sistema de patronamiento ya establecido. El eje DV es un buen sistema de estudio ya que se conoce en detalle en Drosophila melanogaster pero no en otros insectos. Los insectos además presentan una gran variedad de especies y modos de desarrollo embrionario lo que nos permite estudiar de qué manera las redes regulatorias se adaptan a novedades evolutivas y la existencia de varias técnicas que permiten testear el funcionamiento de los genes y sus interacciones. En este contexto hemos utilizado a Rhodnius prolixus como modelo para el estudio del establecimiento del eje DV en un embrión de banda germinal intermedia donde al final del desarrollo el embrión posee la misma forma que el adulto. Hemos estudiado en detalle el desarrollo embrionario de R. prolixus para una mejor comprensión de los patrones de expresión de los genes estudiados y su función. Además, se han buscado y anotado varios genes envueltos en la formación del eje DV: toll, dorsal, decapentaplegic, zerknült, twist y zelda. Mostraremos el patrón de expresión y los fenotipos resultado de ARNi parental de toll, dpp y dorsal, los cuales representan puntos clave en la regulación de la cascada D-V.

Stability of bounded rapid shear flows of a granular material

1996 ◽  
Vol 308 ◽  
pp. 31-62 ◽  
Author(s):  
Chi-Hwa Wang ◽  
R. Jackson ◽  
S. Sundaresan
Keyword(s):  
Growth Rate ◽  
Stability Analysis ◽  
Granular Material ◽  
Bulk Density ◽  
Particulate Material ◽  
Dominant Mode ◽  
Marginal Stability ◽  
Sheared Layer ◽  
The Stability ◽  
Unusual Type

This paper presents a linear stability analysis of a rapidly sheared layer of granular material confined between two parallel solid plates. The form of the steady base-state solution depends on the nature of the interaction between the material and the bounding plates and three cases are considered, in which the boundaries act as sources or sinks of pseudo-thermal energy, or merely confine the material while leaving the velocity profile linear, as in unbounded shear. The stability analysis is conventional, though complicated, and the results are similar in all cases. For given physical properties of the particles and the bounding plates it is found that the condition of marginal stability depends only on the separation between the plates and the mean bulk density of the particulate material contained between them. The system is stable when the thickness of the layer is sufficiently small, but if the thickness is increased it becomes unstable, and initially the fastest growing mode is analogous to modes of the corresponding unbounded problem. However, with a further increase in thickness a new mode becomes dominant and this is of an unusual type, with no analogue in the case of unbounded shear. The growth rate of this mode passes through a maximum at a certain value of the thickness of the sheared layer, at which point it grows much faster than any mode that could be shared with the unbounded problem. The growth rate of the dominant mode also depends on the bulk density of the material, and is greatest when this is neither very large nor very small.

A new feeding technique for experimental and routine culturing of the insect Rhodnius prolixus

1994 ◽  
Vol 72 (12) ◽  
pp. 2244-2247 ◽  
Author(s):  
Erwin Huebner ◽  
Rene Harrison ◽  
Karen Yeow
Keyword(s):  
Cost Effective ◽  
Rhodnius Prolixus ◽  
Wire Mesh ◽  
Artificial Membrane ◽  
Egg Hatchability ◽  
Rabbit Blood ◽  
Adult Females ◽  
Feeding Technique ◽  
Heat Sealing ◽  
Membrane Envelope

We report a method for artificially feeding the reduviid insect Rhodnius prolixus that utilizes heparinized rabbit blood enclosed in an artificial-membrane envelope. Envelopes of Parafilm M® or Nescofilm® are made by heat sealing two pieces, one of which is stretched first, on three sides. Blood is then put into the envelope, the air expelled, and the fourth side sealed with a bag sealer. The blood-filled envelopes are then placed on a standard slide warmer set at 37 °C and insects in jars with wire-mesh tops are allowed to feed. Normal gorging and subsequent molting of instars were attained. Adult females show normal fecundity (the E value was 0.19 for mated females) and egg hatchability was also normal. The method is simple, cost effective, and easy to implement. It is especially suited for experimental feedings.

Triggering the proboscis extension reflex (PER) in Rhodnius prolixus

2021 ◽  
pp. 104249
Author(s):  
Raquel A. Ferreira ◽  
Marcelo G. Lorenzo ◽  
Claudio R. Lazzari
Keyword(s):  
Rhodnius Prolixus ◽  
Proboscis Extension Reflex ◽  
Proboscis Extension
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