The fine structure of developing type ‘B’ dermal glands in Rhodnius prolixus

1970 ◽  
Vol 2 (1) ◽  
pp. 119-138 ◽  
Author(s):  
Joan Lai-Fook
Keyword(s):  
Fine Structure ◽  
Rhodnius Prolixus ◽  
Type B ◽  
Dermal Glands

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.

The Brindley's glands of Rhodnius prolixus. I. Structure of the mature gland

1979 ◽  
Vol 57 (5) ◽  
pp. 1109-1119 ◽  
Author(s):  
F. M. Barrett ◽  
B. F. Millen ◽  
J. Lai-Fook
Keyword(s):  
Microscopic Study ◽  
Electron Microscopic Study ◽  
Functional Significance ◽  
Type A ◽  
Rhodnius Prolixus ◽  
Type B ◽  
Electron Microscopic ◽  
Dermal Glands ◽  
Similarities And Differences ◽  
Secretory Apparatus

A detailed light and electron microscopic study of the Brindley's glands of adult Rhodnius prolixus has confirmed the presence of type B glandular units similar to those described for the dermal glands of Rhodnius and has identified the second type A glandular unit, also composed of secretory apparatus, saccule, and duct, but outnumbered approximately 18:1 by the type B units. Similarities and differences between type A and type B glandular units are described and the possible functional significance of the two types of unit is discussed.

The Brindley's glands of Rhodnius prolixus. II. Development of the glands during the fifth instar

1979 ◽  
Vol 57 (5) ◽  
pp. 1120-1128 ◽  
Author(s):  
B. F. Millen ◽  
F. M. Barrett ◽  
J. Lai-Fook
Keyword(s):  
Type A ◽  
Rhodnius Prolixus ◽  
Glandular Epithelium ◽  
Secretory Cells ◽  
Type B ◽  
Duct Cells ◽  
Secretory Apparatus

The histology of the developing Brindley's gland of adult Rhodnius is described. The presumptive epithelium from which the gland will develop is distinguishable on the 4th day after feeding the fifth instar by its intense stainability. The epithelium thickens and lengthens through rapid mitosis resulting in a hollow, thick-walled sac with a short duct. The duct cells become distinguishable first, then glandular epithelium and the saccules and eventually the secretory apparatus of the secretory cells. Mitosis continues, at a decreasing rate, until the 20th day after feeding, somewhat later than it would occur in the surrounding integument. Just prior to ecdysis the type A glandular units are indistinguishable from those of the adult; however, the type B units appear somewhat less completely developed.

Spectrum of azulene. IV. Rotational analysis of the 0-0 band of the 3500 Ǻ transition

1968 ◽  
Vol 21 (12) ◽  
pp. 2835 ◽  
Author(s):  
AJ McHugh ◽  
DA Ramsay ◽  
IG Ross
Keyword(s):  
Fine Structure ◽  
Excited State ◽  
Type A ◽  
Resolving Power ◽  
Rotational Analysis ◽  
Type B ◽  
Rotational Constants ◽  
Multiple Line ◽  
Asymmetric Top ◽  
Low K

The bands of the 3500 Ǻ transition of azulene-do and azulene-ds show two unequal peaks 2.3 cm-l apart, followed by closely spaced fine structure. These bands have been analysed as type A bands of a planar, prolate asymmetric top. Rotational constants for both molecules in the excited state have been determined. The fine structure is due to multiple line coincidences in the high-J, low-K region of the qP branch. To each multiple line can be attributed a running number n = J+m, where m = J-K-1. Given sufficient resolving power, such "lines" should be rather commonly observed in type A and type B bands of large, planar, prolate molecules.

Fine structure of the abdominal neurosecretory organs of Rhodnius prolixus Stål.

1981 ◽  
Vol 59 (5) ◽  
pp. 765-770 ◽  
Author(s):  
J. E. Kuster ◽  
K. G. Davey
Keyword(s):  
Fine Structure ◽  
Connective Tissue ◽  
Rhodnius Prolixus ◽  
Neurosecretory Neurons ◽  
Neurohaemal Areas

Abdominal segments II–V of female Rhodnius prolixus adults each contain a pair of abdominal neurosecretory organs (ANO). They are attached to the anterolateral borders of their respective tergites and sternites. The ANO consist of neurosecretory neurons containing granules approximately 120 nm in diameter, together with glial and connective tissue elements. Apparent neurohaemal areas are located dorsally.

scholarly journals The epicuticle in an insect, Rhodnius prolixus (Hemiptera)

1947 ◽  
Vol 134 (875) ◽  
pp. 163-181 ◽  
Keyword(s):  
Rhodnius Prolixus ◽  
Epidermal Cells ◽  
Continuous Film ◽  
Cement Layer ◽  
Dermal Glands ◽  
Pore Canals

The ʻepicuticle’ in Rhodnius consists of four layers. From within outwards these are: (i) the ‘cuticulin layer’ composed, it is suggested, of polymerized lipoproteins tanned by quinones; (ii) the ‘polyphenol layer’ rich in dihydroxyphenols; (iii) the ‘wax layer’ responsible for the waterproofing of the cuticle; (iv) the ‘cement layer’ of unknown nature protecting the wax. The pore canals appear to penetrate the cuticulin layer. The oenocytes produce the lipoproteins which are deposited by the epidermal cells to form the cuticulin layer. The polyphenols then appear at the tips of the pore canals as minute droplets which unite to form a continuous film over the surface of the cuticulin. The wax is then secreted, also by the epidermal cells, and laid down over the polyphenol layer immediately before the old skin is shed. The cement is secreted by the dermal glands and poured out over the surface of the wax within an hour after moulting. The storage and use of the reserves of glycogen, fat and protein during the moulting process are described.

Determination of Cell Function in an Insect

Development ◽  
1953 ◽  
Vol 1 (3) ◽  
pp. 269-277
Author(s):  
V. B. Wigglesworth
Keyword(s):  
Cell Function ◽  
Single Layer ◽  
Rhodnius Prolixus ◽  
Epidermal Cells ◽  
The Body ◽  
Dermal Glands ◽  
Clear Space

I Propose to consider two kinds of determination and differentiation which have been studied in the hemipteron Rhodnius prolixus. (i) The determination of the cell or group of cells, with their subsequent differentiation to produce a given part of the body, (ii) The determination or control of the characters of that part—whether these are to be juvenile (larval) or adult (imaginal). Discussion of this second type of determination will require consideration of the role of hormones in controlling differentiation in insects. The integument of the abdomen in the Rhodnius larva consists of a single layer of epidermal cells and the overlying cuticle. At regular intervals the cuticle is modified to form little plaques each of which bears an innervated bristle (Wigglesworth, 1933). The cuticle is pierced at intervals by the ducts of dermal glands: these form a cluster of 4 or 5 around each plaque, with occasional single glands in the clear space between (Wigglesworth, 1947) (Fig. 3, A).

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