scholarly journals TOXIC EFFECTS OF COPPER ON ATTACHMENT AND GROWTH OF BUGULA NERITINA

1946 ◽  
Vol 90 (2) ◽  
pp. 122-140 ◽  
Author(s):  
MILTON A. MILLER
Keyword(s):  
Toxic Effects ◽  
Bugula Neritina

Ultrastructure of the effect of T-514 obtained from Karwinskia humboldtiana on assembly and integrity of yeast's peroxisomes

1991 ◽  
Vol 49 ◽  
pp. 136-137
Author(s):  
J. Sepulveda-Saavedra ◽  
I. Vander-Klei ◽  
M. Venhuis ◽  
Y. Piñeyro-Lopez
Keyword(s):  
Culture Conditions ◽  
Toxic Effects ◽  
Candida Boidinii ◽  
Central Mexico ◽  
Poisonous Plant ◽  
Biological Behaviour ◽  
Enzyme Content ◽  
Fat Deposits ◽  
Yeast Model

Karwinskia humboldtiana is a poisonous plant that grows in semi desertic areas in north and central México. It produces several substances with different toxic effects. One of them designated T-514 damages severely the lung, kidney and liver, producing in the hepatoeyte large intracellular fat deposits and necrosis. Preliminary observations demonstrated that three is a decrease in the amount of peroxisomes in the hepatocytes of experimentally intoxicated rats and monkeys. To study the effect exerted by the T-514 on peroxisomes, a yeast model was selected, thus, three species: Saccha romices cerevisiae, Ilansenula polymorpha and Candida boidinii were used, because there is information concerning their peroxisome's morphology, enzyme content, biological behaviour under different culture conditions and biogenesis.

Some Conditions Necessary for Pinocytosis

1968 ◽  
Vol 26 ◽  
pp. 142-143
Author(s):  
M. W. Brightman
Keyword(s):  
Smooth Muscle ◽  
Cell Membrane ◽  
Toxic Effects ◽  
Cytological Evidence ◽  
Cell Processes

The cytological evidence for pinocytosis is the focal infolding of the cell membrane to form surface pits that eventually pinch off and move into the cytoplasm. This activity, which can be inhibited by oxidative and glycolytic poisons, is performed only by cell processes that are at least 300A wide. However, the interpretation of such toxic effects becomes equivocal if the membrane invaginations do not normally lead to the formation of migratory vesicles, as in some endothelia and in smooth muscle. The present study is an attempt to set forth some conditions under which pinocytosis, as distinct from the mere inclusion of material in surface invaginations, can take place.

A Simplified Placenta-Like Brooding System in Bulgula neritina (Bryozoa)

1972 ◽  
Vol 30 ◽  
pp. 130-131 ◽  
Author(s):  
Robert M. Woollacott ◽  
Russel L. Zimmer
Keyword(s):  
Bugula Neritina ◽  
Brood Chamber ◽  
Tissue Mass ◽  
Embryonic Nutrition

Embryos of many bryozoans are retained during development within a helmetshaped brood chamber that is composed of two parts: an outer, double-walled, calcified ooecial fold and an inner, membranous ooecial vesicle. The embryo is brooded “externally” between these two structures and, in Bugula neritina, increases 27 to 35 fold in volume during its embryogenesis. Since the blastocoelic space is obliterated early in development, this change represents an increase in tissue mass. Clearly, some form of extra-embryonic nutrition is implicated. Calvet first noted that the lining of the ooecial vesicle in regions adjacent to the embryo undergoes a pronounced hypertrophy, and Marcus later proposed that this epithelium provides nutrition to the young. Sileh, however, suggested that the hypertrophied layer functions only as a supportive cushion.

Toxic effects of aerosol propellants on the heart

1973 ◽  
Vol 131 (1) ◽  
pp. 162-166 ◽  
Author(s):  
W. S. Harris
Keyword(s):  
Toxic Effects

Centella asiatica Protects Against the Toxic Effects of Intracellular beta-amyloid Accumulation

Planta Medica ◽  
2013 ◽  
Vol 79 (10) ◽  
Author(s):  
N Gray ◽  
J Morré ◽  
J Kelley ◽  
C Maier ◽  
F Stevens ◽  
...  
Keyword(s):  
Centella Asiatica ◽  
Beta Amyloid ◽  
Toxic Effects ◽  
Amyloid Accumulation
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