scholarly journals Major loss of coralline algal diversity in response to ocean acidification

2021 ◽  
Author(s):  
Viviana Peña ◽  
Ben P. Harvey ◽  
Sylvain Agostini ◽  
Lucia Porzio ◽  
Marco Milazzo ◽  
...  
Keyword(s):  
Ocean Acidification ◽  
Algal Diversity ◽  
Major Loss

Functional Fractionation of Platelets: Aggregation Kinetics and Glycoprotein Labeling of Differing Platelet Populations

1982 ◽  
Vol 48 (02) ◽  
pp. 211-216 ◽  
Author(s):  
V M Haver ◽  
A R L Gear
Keyword(s):  
Galactose Oxidase ◽  
Aggregation Kinetics ◽  
Maximal Rate ◽  
Membrane Glycoproteins ◽  
Whole Cells ◽  
Reversible Aggregation ◽  
Significant Difference ◽  
Small Doses ◽  
Major Loss ◽  
Kinetics Of

SummaryPlatelet heterogeneity has been studied with a technique called functional fractionation which employs gentle centrifugation to yield subpopulations (“reactive” and “less-reactive” platelets) after exposure to small doses of aggregating agent. Aggregation kinetics of the different platelet populations were investigated by quenched-flow aggregometry. The large, “reactive” platelets were more sensitive to ADP (Ka = 1.74 μM) than the smaller “less-reactive” platelets (Ka = 4.08 μM). However, their maximal rate of aggregation (Vmax, % of platelets aggregating per sec) of 23.3 was significantly lower than the “less-reactive” platelets (Vmax = 34.7). The “reactive” platelets had a 2.2 fold higher level of cyclic AMP.Platelet glycoproteins were labeled using the neuraminidase-galactose oxidase – [H3]-NaBH4 technique. When platelets were labeled after reversible aggregation, the “reactive” platelets showed a two-fold decrease in labeling efficiency (versus control platelets). However, examination of whole cells or membrane preparations from reversibly aggregated platelets revealed no significant difference in Coomassie or PAS (Schiff) staining.These results suggest that the large, “reactive” platelets are more sensitive to ADP but are not hyperaggregable in a kinetic sense. Reversible aggregation may cause a re-orientation of membrane glycoproteins that is apparently not characterized by a major loss of glycoprotein material.

Effects of ocean acidification on larval development and early post-hatching traits in Concholepas concholepas (loco)

2014 ◽  
Vol 514 ◽  
pp. 87-103 ◽  
Author(s):  
PH Manríquez ◽  
ME Jara ◽  
ML Mardones ◽  
R Torres ◽  
NA Lagos ◽  
...  
Keyword(s):  
Ocean Acidification ◽  
Larval Development ◽  
Concholepas Concholepas

Calcification of an estuarine coccolithophore increases with ocean acidification when subjected to diurnally fluctuating carbonate chemistry

2018 ◽  
Vol 601 ◽  
pp. 59-76
Author(s):  
MM White ◽  
DT Drapeau ◽  
LC Lubelczyk ◽  
VC Abel ◽  
BC Bowler ◽  
...  
Keyword(s):  
Ocean Acidification ◽  
Carbonate Chemistry

Ocean Acidification Investigation

Science Scope ◽  
2018 ◽  
Vol 042 (05) ◽  
Author(s):  
Kathleen Christie-blick
Keyword(s):  
Ocean Acidification

How strong are soccer teams? The ‘Host paradox’ and other counterintuitive properties of the FIFA’s ranking.

2019 ◽  
Author(s):  
Marek Kaminski
Keyword(s):  
Long Time ◽  
Soccer Teams ◽  
Major Loss ◽  
Host Effect ◽  
Large Investment

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Helvetica Neue'} <p>The FIFA's ranking of national soccer teams is plagued with paradoxes. One surprising paradox is a dramatic underrating of the hosts of main tournaments. The hosts, who are absent from the preliminaries, for a long time, play only friendlies that award few points. Three models estimate the magnitude of the resulting “Host Effect” at 14.1-16.7 positions. Such an estimate goes against the intuition that a large investment in hosting a tournament should result in improvement of the host team’s standing. Host’s low ranking decreases the interest in the tournament and may result in a major loss of advertisement revenue.</p>

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