Effects of short-term exposure to ultraviolet-B radiation on photosynthesis and pigment content of red (wild types), greenish-brown, and green strains of Gracilaria birdiae (Gracilariales, Rhodophyta)

2013 ◽  
Vol 26 (2) ◽  
pp. 867-879 ◽  
Author(s):  
L. M. Ayres-Ostrock ◽  
E. M. Plastino
Keyword(s):  
Ultraviolet B ◽  
Pigment Content ◽  
Short Term ◽  
Ultraviolet B Radiation ◽  
Short Term Exposure ◽  
Gracilaria Birdiae

The Effect of Dimethyl Sulfoxide on In Vitro Platelet Function

1976 ◽  
Vol 36 (01) ◽  
pp. 221-229 ◽  
Author(s):  
Charles A. Schiffer ◽  
Caroline L. Whitaker ◽  
Morton Schmukler ◽  
Joseph Aisner ◽  
Steven L. Hilbert
Keyword(s):  
Platelet Count ◽  
Platelet Aggregation ◽  
Dimethyl Sulfoxide ◽  
Platelet Function ◽  
Platelet Volume ◽  
Short Term ◽  
Platelet Factor ◽  
Short Term Exposure ◽  
Structural Abnormalities

SummaryAlthough dimethyl sulfoxide (DMSO) has been used extensively as a cryopreservative for platelets there are few studies dealing with the effect of DMSO on platelet function. Using techniques similar to those employed in platelet cryopreservation platelets were incubated with final concentrations of 2-10% DMSO at 25° C. After exposure to 5 and 10% DMSO platelets remained discoid and electron micrographs revealed no structural abnormalities. There was no significant change in platelet count. In terms of injury to platelet membranes, there was no increased availability of platelet factor-3 or leakage of nucleotides, 5 hydroxytryptamine (5HT) or glycosidases with final DMSO concentrations of 2.5, 5 and 10% DMSO. Thrombin stimulated nucleotide and 5HT release was reduced by 10% DMSO. Impairment of thrombin induced glycosidase release was noted at lower DMSO concentrations and was dose related. Similarly, aggregation to ADP was progressively impaired at DMSO concentrations from 1-5% and was dose related. After the platelets exposed to DMSO were washed, however, aggregation and release returned to control values. Platelet aggregation by epinephrine was also inhibited by DMSO and this could not be corrected by washing the platelets. DMSO-plasma solutions are hypertonic but only minimal increases in platelet volume (at 10% DMSO) could be detected. Shrinkage of platelets was seen with hypertonic solutions of sodium chloride or sucrose suggesting that the rapid transmembrane passage of DMSO prevented significant shifts of water. These studies demonstrate that there are minimal irreversible alterations in in vitro platelet function after short-term exposure to DMSO.

Activation of HIV in Human Skin by Ultraviolet B Radiation and its Inhibition by NFκB Blocking Agents¶

2001 ◽  
Vol 74 (6) ◽  
pp. 805 ◽  
Author(s):  
Joan Breuer-McHam ◽  
Eric Simpson ◽  
Irene Dougherty ◽  
Makoto Bonkobara ◽  
Kiyoshi Ariizumi ◽  
...  
Keyword(s):  
Human Skin ◽  
Ultraviolet B ◽  
Ultraviolet B Radiation ◽  
Blocking Agents

Ancestral U.S. Soybean Cultivars Characterized for Tolerance to Ultraviolet‐B Radiation

Crop Science ◽  
1992 ◽  
Vol 32 (5) ◽  
pp. 1214-1219 ◽  
Author(s):  
Herbert E. Reed ◽  
Alan H. Teramura ◽  
William J. Kenworthy
Keyword(s):  
Ultraviolet B ◽  
Ultraviolet B Radiation ◽  
Soybean Cultivars
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