A morphometric analysis of the phloem-unloading pathway in developing tobacco leaves

Planta ◽  
1988 ◽  
Vol 176 (3) ◽  
pp. 307-318 ◽  
Author(s):  
Biao Ding ◽  
M. V. Parthasarathy ◽  
Karl Niklas ◽  
Robert Turgeon
Keyword(s):  
Morphometric Analysis ◽  
Phloem Unloading ◽  
Tobacco Leaves

Low temperature x-ray microanalysis of frozen-hydrated tobacco leaves

1984 ◽  
Vol 42 ◽  
pp. 284-285
Author(s):  
S. Edith Taylor ◽  
Patrick Echlin ◽  
May McKoon ◽  
Thomas L. Hayes
Keyword(s):  
Low Temperature ◽  
Lemna Minor ◽  
Root Tips ◽  
Tobacco Leaves ◽  
X Ray ◽  
Whole Cells ◽  
Carbon Coated ◽  
The Right ◽  
Beam Currents ◽  
The University

Low temperature x-ray microanalysis (LTXM) of solid biological materials has been documented for Lemna minor L. root tips. This discussion will be limited to a demonstration of LTXM for measuring relative elemental distributions of P,S,Cl and K species within whole cells of tobacco leaves.Mature Wisconsin-38 tobacco was grown in the greenhouse at the University of California, Berkeley and picked daily from the mid-stalk position (leaf #9). The tissue was excised from the right of the mid rib and rapidly frozen in liquid nitrogen slush. It was then placed into an Amray biochamber and maintained at 103K. Fracture faces of the tissue were prepared and carbon-coated in the biochamber. The prepared sample was transferred from the biochamber to the Amray 1000A SEM equipped with a cold stage to maintain low temperatures at 103K. Analyses were performed using a tungsten source with accelerating voltages of 17.5 to 20 KV and beam currents from 1-2nA.

Morphometric Analysis of the Hepatocytes from Fish Exposed to Arsenic

1976 ◽  
Vol 34 ◽  
pp. 282-283
Author(s):  
Elsie M. B. Sorensen
Keyword(s):  
Morphometric Analysis ◽  
Arsenic Concentration ◽  
Ultrastructural Changes ◽  
Sodium Arsenate ◽  
Lepomis Cyanellus ◽  
Mammalian Counterpart ◽  
Intracellular Changes ◽  
Green Sunfish ◽  
Organic Pesticides

The detoxification capacity of the liver is well documented for a variety of substances including ethanol, organic pesticides, drugs, and metals. The piscean liver, although less enzymatically active than the mammalian counterpart (1), contains endoplasmic reticulum with an impressive repertoire of oxidizing, reducing, and conjugating abilities (2). Histopathologic changes are kncwn to occur in fish hepatocytes following in vivo exposure to arsenic (3); however, ultrastructural changes have not been reported. This study involved the morphometric analysis of intracellular changes in fish parynchymal hepatocytes and correlation with arsenic concentration in the liver.Green sunfish (Lepomis cyanellus, R.) were exposed to 0, 30, or 60 ppm arsenic (as sodium arsenate) at 20°C for 1, 2, or 3 week intervals before removal of livers for quantification of the arsenic burden (using neutron activation analysis) and morphometric analysis of ultrastructural alterations. Livers were cut into 1 mm cubes for fixation, dehydration, and embedding.

Morphometric analysis of pulmonary vascular remodeling in COPD

Pneumologie ◽  
2009 ◽  
Vol 63 (02) ◽  
Author(s):  
T Medebach ◽  
N Weissmann ◽  
HA Ghofrani ◽  
W Seeger ◽  
F Grimminger
Keyword(s):  
Morphometric Analysis ◽  
Vascular Remodeling ◽  
Pulmonary Vascular Remodeling

Morphometric Analysis of the Petroclival Angle in Adults Using High Resolution CT Scans

2020 ◽  
Author(s):  
Ahmad Alhourani ◽  
Zaid Aljuboori ◽  
Candice Nguyen ◽  
Heegok Yeo ◽  
Brian Williams ◽  
...  
Keyword(s):  
High Resolution ◽  
Morphometric Analysis ◽  
Ct Scans ◽  
High Resolution Ct

Endonasal Surgery of the Upper Cervical Spine: A Morphometric Analysis

Skull Base ◽  
2008 ◽  
Vol 18 (S 01) ◽  
Author(s):  
Harminder Singh ◽  
Bartosz Grobelny ◽  
Adam Flanders ◽  
Marc Rosen ◽  
Paul Schiffmacher ◽  
...  
Keyword(s):  
Cervical Spine ◽  
Morphometric Analysis ◽  
Upper Cervical Spine ◽  
Endonasal Surgery ◽  
Upper Cervical
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