The role of polyols and nucleating agents in cold-hardy beetles

1980 ◽  
Vol 140 (3) ◽  
pp. 227-234 ◽  
Author(s):  
Karl Erik Zachariassen
Keyword(s):  
Nucleating Agents ◽  
Cold Hardy

scholarly journals Characterization of Hydrangea macrophylla Cultivars by the Anthocyanin Content in their Sepals

2011 ◽  
Vol 29 (3) ◽  
pp. 131-136
Author(s):  
Henry D. Schreiber ◽  
Samantha E. Wade ◽  
Kelly M. Mayhew ◽  
Jason A. Cobb
Keyword(s):  
Anthocyanin Content ◽  
Color Intensity ◽  
Hydrangea Macrophylla ◽  
Perceived Intensity ◽  
Differential Spectrophotometry ◽  
Commercial Cultivars ◽  
Cold Hardy

Abstract In order to ascertain the role of anthocyanin content on the color and brightness of Hydrangea macrophylla sepals, anthocyanin contents of different colored sepals were measured for numerous commercial cultivars. Anthocyanin contents were primarily determined by extraction of the pigment, then measurement by differential spectrophotometry. Concentrations ranged from about 25 to over 400 μg delphinidin-3-glucoside per g of fresh sepal, with the magnitude roughly proportional to the perceived intensity of sepal coloration for that Hydrangea macrophylla cultivar. However, the anthocyanin content was independent of the sepal color, being the same for red, purple, or blue sepals of the same cultivar. Even though significant sepal-to-sepal variation in color intensity existed within a single inflorescence, the extractable anthocyanin content was constant for a specific cultivar. Accordingly, Hydrangea macrophylla cultivars were classified in terms of their color brightness or anthocyanin content in sepals as blush (very light colored, 25 to 60 μg·g−1), cold-hardy (light colored, 80 to 120 μg·g−1), classic (medium colored, 140 to 190 μg·g−1), vivid (deep colored, 230 to 270 μg·g−1), or vibrant (very deep colored, >300 μg·g−1) at peak bloom. The anthocyanin content of the sepals steadily increased as the inflorescence approached peak bloom, remained constant for a week or more, then decreased. The cultivar-dependent anthocyanin contents of the sepals can be used, in part, to rationalize the relative bluing capability of the various Hydrangea macrophylla cultivars.

New understanding in the influence of melt structure and β-nucleating agents on the polymorphic behavior of isotactic polypropylene

RSC Advances ◽  
2014 ◽  
Vol 4 (56) ◽  
pp. 29514-29526 ◽  
Author(s):  
Jian Kang ◽  
Gengsheng Weng ◽  
Zhengfang Chen ◽  
Jinyao Chen ◽  
Ya Cao ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Nucleation Mechanism ◽  
Nucleating Agents ◽  
Polymorphic Behavior ◽  
Two Stage ◽  
Melt Structure ◽  
Ordered Structures

Schematic illustration of the two-stage β-nucleation mechanism of β-iPP nucleated with dual-selective β-nucleating agents and the role of ordered structures.

Life in a frozen state: adaptive strategies for natural freeze tolerance in amphibians and reptiles

1990 ◽  
Vol 258 (3) ◽  
pp. R559-R568 ◽  
Author(s):  
K. B. Storey
Keyword(s):  
Rana Sylvatica ◽  
Freeze Tolerance ◽  
Painted Turtle ◽  
Nucleating Agents ◽  
Garter Snakes ◽  
Isolated Cells ◽  
Subzero Temperatures ◽  
Cryoprotectant Synthesis ◽  
Total Body

Winter survival for various species of amphibians and reptiles that hibernate on land depends on freeze tolerance, the ability to survive for long periods of time with up to 65% of total body water as extracellular ice. Freeze tolerance has been described for four species of frogs, one salamander, and hatchlings of the painted turtle. A very limited tolerance also occurs in garter snakes. Studies of freeze tolerance in vertebrates have primarily focused on the wood frog Rana sylvatica and have assessed the regulation of cryoprotectant synthesis, cryoprotectant action in freezing preservation of isolated cells and tissues, metabolism and energetics under the ischemic conditions imposed by freezing, and the role of ice-nucleating agents in blood. The adaptations that preserve life at subzero temperatures for these animals illustrate the principles of vertebrate organ cryopreservation and may have important applications in the development of technology for the freezing preservation of transplantable human organs.

scholarly journals The role of nucleating agents in high-pressure-induced gamma crystallization in isotactic polypropylene

2014 ◽  
Vol 293 (3) ◽  
pp. 665-675 ◽  
Author(s):  
Przemyslaw Sowinski ◽  
Ewa Piorkowska ◽  
Severine A. E. Boyer ◽  
Jean-Marc Haudin ◽  
Kinga Zapala
Keyword(s):  
High Pressure ◽  
Isotactic Polypropylene ◽  
Nucleating Agents

Investigation of the Role of Nucleating Agents in MgO−SiO2−Al2O3−SiO2−TiO2Glasses and Glass-Ceramics: A XANES Study at the Ti K- and L2,3-Edges

2011 ◽  
Vol 11 (1) ◽  
pp. 311-319 ◽  
Author(s):  
L. Cormier ◽  
O. Dargaud ◽  
N. Menguy ◽  
G. S. Henderson ◽  
M. Guignard ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Nucleating Agents
Sign in / Sign up

Export Citation Format

Share Document