On the localization, the fine structure, and the chemical composition of crystalline inclusions in theThesium humifusum haustoria

PROTOPLASMA ◽  
1977 ◽  
Vol 93 (2-3) ◽  
pp. 223-229 ◽  
Author(s):  
S. Renaudin ◽  
Noelle Cheguillaume
Keyword(s):  
Fine Structure ◽  
Chemical Composition ◽  
Crystalline Inclusions

Diurnal appearance, fine structure, and chemical composition of fatty particles inHeterosigma akashiwo (Raphidophyceae)

PROTOPLASMA ◽  
1987 ◽  
Vol 137 (2-3) ◽  
pp. 134-139 ◽  
Author(s):  
M. Wada ◽  
Y. Hara ◽  
M. Kato ◽  
M. Yamada ◽  
T. Fujii
Keyword(s):  
Fine Structure ◽  
Chemical Composition

scholarly journals Submicroscopic Organization of Retinal Cones of the Rabbit

1958 ◽  
Vol 4 (6) ◽  
pp. 743-746 ◽  
Author(s):  
Eduardo De Robertis ◽  
Arnaldo Lasansky
Keyword(s):  
Endoplasmic Reticulum ◽  
Fine Structure ◽  
Chemical Composition ◽  
Outer Segment ◽  
Distal Portion ◽  
Cone Cell ◽  
Specific Chemical ◽  
General Plan ◽  
Clear Space ◽  
And Function

The fine structure of the cone cell of the rabbit is described and compared wtih that of the rod. The cone outer segment consists of a pile of flattened sacs with two membranes 30 A thick and a regular clear space in between of about 30 A. The membrane of the rod sacs is slightly thicker (∼40 A) and the clear space is less regular and frequently absent in the deeper regions. The distance between sacs is from 85 to 95 A in the cone and from 110 to 120 A in the rod, and the total repeating period is about 190 A and 210 A, respectively. These results are discussed in relation to the concentration of solids in both photoreceptors. A connecting cilium was observed in the cone cell and compared with that previously described in rods (4). This finding suggests that morphogenetically the cone may also result of the differentiation of a primitive cilium (5). The inner segment of the cone shows a distal portion with large concentration of elongated mitochondria and a proximal one with a large Golgi complex in the axis surrounded by components of the endoplasmic reticulum. It is concluded that both photoreceptors have a similar general plan of submicroscopic organization, with some minor difference in fine structure probably related to their specific chemical composition and function.

scholarly journals Cuticular Transpiration and Wax Structure and Composition of Leaves and Fruit of Vitis Vinifera

1967 ◽  
Vol 20 (6) ◽  
pp. 1149 ◽  
Author(s):  
JV Possingham ◽  
TC Chambers ◽  
F Radler ◽  
M Grncarevic
Keyword(s):  
Fine Structure ◽  
Chemical Composition ◽  
Vitis Vinifera ◽  
Light Petroleum ◽  
Replica Technique ◽  
Carbon Replica ◽  
Cuticular Transpiration ◽  
Leaf Wax ◽  
Surface Wax ◽  
Platelet Structure

The fine structure of the surface wax of leaves of sultana vines (Vitia viiUJera var. sultana) has been examined using the carbon replica technique. Leaf wax was found to be morphologically similar to the wax on the surface of grapes and to consist of a series of overlapping platelets. A brief period (30 sec) of exposure to light petroleum vapour disorganized the platelet structure of both leaf and fruit wax. This treatment markedly increased the cuticular transpiration of both fruits and leaves. The results are discussed in relation to the known chemical composition of these waxes. It is suggested that the surface wax, which consists of overlapping platelets that are hydrophobic in nature, may be important in controlling cuticular transpiration in both the fruit and leaves of grape.vines.

scholarly journals INTRACELLULAR CRYSTALLINE ERGOSTEROL IN NEUROSPORA

1961 ◽  
Vol 11 (1) ◽  
pp. 171-177 ◽  
Author(s):  
Seizo Tsuda ◽  
E. L. Tatum
Keyword(s):  
Spectral Analysis ◽  
Fine Structure ◽  
Neurospora Crassa ◽  
Differential Centrifugation ◽  
Wild Type ◽  
Crystalline Inclusions ◽  
Cytochemical Analysis ◽  
Mutant Strains ◽  
Electron Microscopes

In the fungus Neurospora crassa, hexagonal crystalline inclusions have been observed with both the light and electron microscopes. These crystals have been enriched by differential centrifugation and found to be identical with ergosterol by the criteria of ultraviolet spectral analysis and cytochemical analysis. Observations have been made on the distribution and fine structure of the crystalline bodies in various wild type and mutant strains of N. crassa.

Chromoplasts in Rosa rugosa: Development and Chemical Characterization of Tubular Elements

1976 ◽  
Vol 31 (7-8) ◽  
pp. 456-460d ◽  
Author(s):  
Hans-Gunter Wuttke
Keyword(s):  
Fine Structure ◽  
Chemical Composition ◽  
Cross Section ◽  
Early Stage ◽  
Chemical Characterization ◽  
Longitudinal Axis ◽  
Rosa Rugosa ◽  
Polarizing Microscopy ◽  
Oriented Parallel

Abstract 1. Development and fine structure of the chromoplasts in hips of Rosa rugosa have been in­ vestigated by electron and polarizing microscopy. 2. The chromoplasts develop from chloroplasts. During disorganization of the thylakoid system characteristic strutures become visible: ‘oblique’ grana, U-shaped thylakoids, and occassionally ‘thylakoid teeth’ as well as thylakoid anastomoses. - In this early stage, tubules appear in the plastid matrix. They are sometimes connected with membranes, especially with thylakoids. 3. In ripe hips the chromoplasts are packed with tubules. These chromoplast tubules, which attain lengths of up to at least 1.5 μm, are non-ramified and lie parallel to each other. Their diameter is variable, with a mean of 18 nm. They are polygonal in cross-section with electron-dense walls and electron-transparent cores. Association of ellipsoidal osmiophilic globules with the tubules can often be seen. Irregularly swollen remnants of former thylakoids are found in connection with these tubules. In spindle-shaped chromoplasts, the tubules are oriented parallel to the longitudinal axis. Positive birefringence and positive dichroism are observed. 4. The chemical composition of tubule fractions has been analyzed. The tubules contain appreciable amounts of carotenoids, phospho- and glycolipids, and proteins. 5. The origin and development of the tubules is discussed. It appears likely that reorganization of part of the thylakoid system and synthesis of carotenoids are involved in the formation of tubules. 6. The plastids in the yellow autumn leaves of Rosa rugosa contain globules but not tubules.

Fine structure of crystalline inclusions in B-cells of the islets of Langerhans in the alligator

1978 ◽  
Vol 187 (3) ◽  
pp. 535-550 ◽  
Author(s):  
I. Raška ◽  
J. Komrska ◽  
M. Titlbach ◽  
M. Rieder
Keyword(s):  
Fine Structure ◽  
B Cells ◽  
Islets Of Langerhans ◽  
Crystalline Inclusions
Sign in / Sign up

Export Citation Format

Share Document