Fine structure of Wolffia arrhiza

1973 ◽  
Vol 51 (9) ◽  
pp. 1619-1622 ◽  
Author(s):  
J. L. Anderson ◽  
W. W. Thomson ◽  
J. A. Swader
Keyword(s):  
Fine Structure ◽  
Cell Division ◽  
Vegetative Reproduction ◽  
Guard Cells ◽  
Epidermal Cells ◽  
Electron Microscopic ◽  
Meristematic Cells ◽  
Wolffia Arrhiza ◽  
Microscopic Studies

Light and electron microscopic studies of Wolffia arrhiza L. frond development during vegetative reproduction showed that the fronds were composed entirely of chlorenchymous cells. Chloroplasts in the epidermal cells other than the guard cells were unique in that they contained no starch. Cell division occurred only at the proximal end of daughter fronds early in their development. Meristematic cells contained chloroplasts with clearly defined grana. Proplastids, commonly observed in meristematic cells of apical regions of other plants, were absent in the cells of these plants.

Dyskeratotic degeneration of epidermal cells in pityriasis rosea: light and electron microscopic studies

1982 ◽  
Vol 107 (2) ◽  
pp. 189-194 ◽  
Author(s):  
H. OKAMOTO ◽  
S. IMAMURA ◽  
T. AOSHIMA ◽  
J. KOMURA ◽  
S. OFUJI
Keyword(s):  
Epidermal Cells ◽  
Electron Microscopic ◽  
Pityriasis Rosea ◽  
Microscopic Studies

scholarly journals ELECTRON MICROSCOPIC STUDIES ON THE INDIRECT FLIGHT MUSCLES OF DROSOPHILA MELANOGASTER

1963 ◽  
Vol 17 (2) ◽  
pp. 351-362 ◽  
Author(s):  
S. Ahmad Shafiq
Keyword(s):  
Drosophila Melanogaster ◽  
Epidermal Cells ◽  
Uniform Density ◽  
Electron Microscopic ◽  
Thick Filaments ◽  
Irregular Pattern ◽  
Regular Arrangement ◽  
Microscopic Studies ◽  
Hexagonal Arrangement ◽  
Flight Muscles

The myofibrils in Drosophila have thick and thin types of myofilaments arranged in the hexagonal pattern described for Calliphora by Huxley and Hanson (15). The thick filaments, along most of their length in the A band, seem to be binary in structure, consisting of a dense cortex and a lighter medulla. In the H zone, however, they show more uniform density; lateral projections (bridges) also appear to be absent in this region. The M band has a varying number of granules (probably of glycogen) distributed between the myofilaments. The myofilaments on reaching the Z region appear to change their hexagonal arrangement and become connected to one another by Z filaments. The regular arrangement of the filaments found in most regions of the fibrils is not seen in the terminal sarcomeres of some flight muscles; the two types of filaments appear to be intermingled in an irregular pattern in these parts of the fibrils. The attachment of myofibrils to the cuticle through the epidermal cells is described.

scholarly journals 6. Electron Microscopic Studies of Surface Fine Structure of Coated Papers (II)

1967 ◽  
Vol 21 (8) ◽  
pp. 444-450
Author(s):  
Rikizo Imamura ◽  
Akiyoshi Yamaoka ◽  
Shozo Maeda
Keyword(s):  
Fine Structure ◽  
Electron Microscopic ◽  
Coated Papers ◽  
Microscopic Studies

Fine Structural Analysis of Sarcoma-180 Tumor Before and After cis-Platinum (II) Diamminodichloride

1971 ◽  
Vol 29 ◽  
pp. 386-387
Author(s):  
S. K. Aggarwal ◽  
A. Sodhi ◽  
L. Van Camp
Keyword(s):  
Fine Structure ◽  
Structural Analysis ◽  
Single Injection ◽  
Sarcoma 180 ◽  
Electron Microscopic ◽  
Irreversible Damage ◽  
Before And After ◽  
Microscopic Studies ◽  
And Control ◽  
Tumor Implant

It has been shown that a single injection of 8.0 mg/kg of the cis (Pt(NH3)2cl2) in normal saline is effective in regressing solid Sarcoma-180 tumors in Swiss White mice, with no apparent irreversible damage to the host. Present investigations were undertaken to study the fine structure of Sarcoma-180 under experimental and control conditions. Platinum injections were made on day 10, (taking the tumor implant as day 0), and the animals were sacrificed at 2 day intervals for 12 days after the injections. The tissue from injected and uninjected animals was processed for electron microscopic studies.

scholarly journals GELS OF NORMAL AND SICKLED HEMOGLOBIN

1970 ◽  
Vol 131 (6) ◽  
pp. 1079-1092 ◽  
Author(s):  
James G. White ◽  
Beatrice Heagan
Keyword(s):  
Fine Structure ◽  
Molecular Assembly ◽  
Electron Microscopic ◽  
Microscopic Studies ◽  
Erythrocyte Sickling ◽  
Hexagonal Crystals ◽  
True Structure ◽  
Structural Arrangements

Electron microscopic studies of the sickling phenomenon have described at least three different structural arrangements of sickled hemoglobin, including empty hexagonal crystals, microtubules, and solid rods. It is unlikely that sickling results in several different polymers, and it is essential to determine the true structure of sickled hemoglobin in order to define the mechanism of molecular assembly. The present study has explored the fine structure of gels formed in cell-free solutions of normal and sickle reduced and oxyhemoglobin. Gels of reduced sickled hemoglobin consisted entirely of solid rods. The gels formed from sickle oxyhemoglobin, normal oxyhemoglobin, and normal reduced hemoglobin contained masses of hollow polymers essentially identical in appearance with microtubules. These findings indicate that solid rods are the characteristic polymers of sickled hemoglobin and tubular polymers represent aberrant structures which are not related to erythrocyte sickling.

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