A histochemical study of the posterior silk glands ofBombyx moriduring metamorphosis from larvae to pupae using frozen sections

2013 ◽  
Vol 89 (2) ◽  
pp. 145-152 ◽  
Author(s):  
K Kawamoto ◽  
T Kawamoto ◽  
H Shiba ◽  
K Hosono
1991 ◽  
Vol 10 (1) ◽  
pp. 9-14 ◽  
Author(s):  
J.E. Bright ◽  
R.H. Inns ◽  
N.J. Tuckwell ◽  
G.D. Griffiths ◽  
T.C. Marrs

A sublethal dose of sarin (GB, isopropyl methylphosphonofluoridate) was administered to mice. The animals were killed up to 28 d after dosing and frozen sections were made of the excised diaghragms which were stained using haematoxylin and eosin and a modified Gomori trichrome method. Muscle fibre degeneration and mononuclear infiltration were seen, notably at 24 h and 3 d. A number of histochemical procedures were carried out, including the GBHA procedure for ionized calcium. Calcium accumulation, seen at 4 h, was the earliest abnormality observed. All changes were rapidly regressing by 5 d and histological appearances were normal by 14 d. It was concluded that sarin produced myopathic changes preceded by calcium accumulation.


1963 ◽  
Vol 16 (3) ◽  
pp. 455-469 ◽  
Author(s):  
Donald G. Walker ◽  
Arnold M. Seligman

Brief formalin fixation in the cold prior to histochemical assay of rat liver and pancreas for various dehydrogenases has been used successfully to circumvent the structural damage and enzymatic loss to which mitochondria of frozen sections would otherwise be subject. To obtain an optimal result a single set of conditions has been devised, including fixation prior to freezing of minute (finely diced) organ blocks in graded concentrations (0.7 to 2.0 per cent) of formaldehyde in chilled (1–4°C) Hanks' balanced salt solution, freezing at not higher than -70°C, and use of nitro-BT or, preferably, tetranitro-BT. The present histochemical study of hepatic and acinar cells indicates that not only are succinic and D-ß-hydroxybutyric dehydrogenases located exclusively in the mitochondria but so are lactic, malic, and the isocitric dehydrogenases.


1951 ◽  
Vol s3-92 (17) ◽  
pp. 87-112
Author(s):  
J. R.G. BRADFIELD

Silk glands of several spiders and caterpillars contain powerful cytoplasmic phosphatase activity localized along the inner border of the cells next to the gland lumen. Phosphatase activity is also high in the nuclei, particularly the nucleoli. Reservoir regions which secrete no silk lack the phosphatase border. Although it is most easily demonstrated histochemically at pH 9, phosphatase activity in sections or homogenates of the glands is high over a considerable range of pH, from at least pH 5.5 to pH 9.8. It appears to be inhibited both by sulphydryl inactivators and by an abundance of sulphydryl groups. In view of the latter point, it is interesting to note that no sulphydryl groups can be detected in the phosphatase border zone (in the more insoluble constituents which remain informalin-fixed frozen sections), although the main bulk of th e cytoplasm is rich in sulphydryl groups. Except in the non-secretory reservoir regions, silk glands of all the species examined are rich in cytoplasmic ribonucleic acid. Although the latter is abundant in the main body of the cell, it is, however, absent from the phosphatase border zone, so that in the cytoplasm nucleic acid ends where phosphatase begins. This suggests that the phosphatas e may be par t of a system of enzymes involved in liberating the finished protein from acomplex with nucleic acids (which have been concerned either in the synthesis of the protein, or in protecting it from proteases, or both). This possibility is discussed in the light of previous studies of phosphatase-nucleic acid relations in other tissues.


Author(s):  
K. T. Tokuyasu

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).


Author(s):  
Kenjiro Yasuda

Localization of amylase,chymotrypsinogen and trypsinogen in pancreas was demonstrated by Yasuda and Coons (1966), by using fluorescent antibody method. These enzymes were naturally found in the zymogen granules. Among them, amylase showed a diffuse localization around the nucleus, in addition to the zymogen granules. Using ferritin antibody method, scattered ferritin granules were also found around the Golgi area (Yasuda et al.,1967). The recent advance in the tissue preparation enables the antigen to be localized in the ultrathin frozen sections, by applying the labeled antibodies onto the sections instead of staining the tissue en bloc.The present study deals with the comparison of the localization of amylase and lipase demonstrated by applying the bismuth-labeled, peroxidase-labeled and ferritin-labeled antibody methods on the ultrathin frozen sections of pancreas, and on the blocks of the same tissue.


Author(s):  
William J. Dougherty ◽  
Samuel S. Spicer

In recent years, considerable attention has focused on the morphological nature of the excitation-contraction coupling system of striated muscle. Since the study of Porter and Palade, it has become evident that the sarcoplastic reticulum (SR) and transverse tubules constitute the major elements of this system. The problem still exists, however, of determining the mechamisms by which the signal to interdigitate is presented to the thick and thin myofilaments. This problem appears to center on the movement of Ca++ions between myofilaments and SR. Recently, Philpott and Goldstein reported acid mucosubstance associated with the SR of fish branchial muscle using the colloidal thorium dioxide technique, and suggested that this material may serve to bind or release divalent cations such as Ca++. In the present study, Hale's iron solution adapted to electron microscopy was applied to formalin-fixed myofibrils isolated from glycerol-extracted rabbit psoas muscles and to frozen sections of formalin-fixed rat psoas muscles.


Author(s):  
R. G. Painter ◽  
K. T. Tokuyasu ◽  
S. J. Singer

A technique for localizing intracellular antigens with immunoferritin conjugates directly on ultrathin frozen sections of glutaraldehyde-fixed tissues has been developed. This method overcomes some of the limitations of previously described procedures, since it avoids drastic fixation, dehydration and embedding procedures which could denature many protein antigens.Briefly cells or tissues were fixed with glutaraldehyde (0.5 to 2% for 1 hr), and ultrathin frozen sections were cut and mounted on grids covered with carbon-coated Formvar film by the procedure described previously. Such sections were stained with ferritin-antibody conjugates by methods described elsewhere.


Author(s):  
K. J. Böhm ◽  
a. E. Unger

During the last years it was shown that also by means of cryo-ultra-microtomy a good preservation of substructural details of biological material was possible. However the specimen generally was prefixed in these cases with aldehydes.Preparing ultrathin frozen sections of chemically non-prefixed material commonly was linked up to considerable technical and manual expense and the results were not always satisfying. Furthermore, it seems to be impossible to carry out cytochemical investigations by means of treating sections of unfixed biological material with aqueous solutions.We therefore tried to overcome these difficulties by preparing yeast cells (S. cerevisiae) in the following manner:


Author(s):  
R. Beeuwkes ◽  
A. Saubermann ◽  
P. Echlin ◽  
S. Churchill

Fifteen years ago, Hall described clearly the advantages of the thin section approach to biological x-ray microanalysis, and described clearly the ratio method for quantitive analysis in such preparations. In this now classic paper, he also made it clear that the ideal method of sample preparation would involve only freezing and sectioning at low temperature. Subsequently, Hall and his coworkers, as well as others, have applied themselves to the task of direct x-ray microanalysis of frozen sections. To achieve this goal, different methodological approachs have been developed as different groups sought solutions to a common group of technical problems. This report describes some of these problems and indicates the specific approaches and procedures developed by our group in order to overcome them. We acknowledge that the techniques evolved by our group are quite different from earlier approaches to cryomicrotomy and sample handling, hence the title of our paper. However, such departures from tradition have been based upon our attempt to apply basic physical principles to the processes involved. We feel we have demonstrated that such a break with tradition has valuable consequences.


Author(s):  
D. Marsh

As a result of vasectomy, spermatozoa are confined to the epididymis and vas deferens, where they degenerate, releasing antigens that enter the circulation or are engulfed by macrophages. Multiple antigens of the sperm can elicit production of autoantibodies; circulating anti-sperm antibodies are found in a large percentage of vasectomized men, indicating the immunogenicity of the sperm. The increased prevalence of macrophages in the liomen of the rhesus monkey testicular efferent ducts after vasectomy led to further study of this region. Frozen sections were used for evaluation of immunopathological status by fluorescence microscopy with fluorescein-conjugated antibody. Subsequent granular deposits of immune complexes were revealed by positive immunofluorescence staining for complement. The immune complex deposition in the basement membrane surrounding the efferent ducts implies that this region is involved in antigen leakage (Fig. 1).


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