secondary calcification
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2021 ◽  
Vol 3 (1) ◽  
pp. 137
Author(s):  
H. Ya. Sylenko H. ◽  
M. Yu. Delva M. ◽  
V. A. Pinchuk ◽  
A. M. Kryvchun ◽  
T. Y. Purdenko

2019 ◽  
Vol 12 (3) ◽  
pp. 31-39 ◽  
Author(s):  
Alevtina S. Stoyukhina

Focal calcifications of the retina and choroid occur usually in such well-known tumors as: retinoblastoma, choroidal osteoma, choroidal hemangioma, retinal astrocytoma. In addition, cases of idiopathic or secondary calcification are known, the most common of them is sclerochoroidal calcification. The article provides a detailed analysis of the clinical and tomographic pictures of ossifying conditions occurring in adults. It is shown that, in addition to a different ophthalmoscopic picture, these conditions are characterized by a different level of localization of the pathological calcification zone and a different stage of retinal damage.


2018 ◽  
Vol 45 (10) ◽  
pp. e282-e283 ◽  
Author(s):  
Tatsuhiko Mori ◽  
Toshiyuki Yamamoto

2015 ◽  
Vol 89 (1) ◽  
pp. 27-37 ◽  
Author(s):  
MOHAN Rahul ◽  
SHETYE Suhas S. ◽  
TIWARI Manish ◽  
ANILKUMAR Narayanpillai

2015 ◽  
Vol 12 (2) ◽  
pp. 567-578 ◽  
Author(s):  
N. J. Silbiger ◽  
M. J. Donahue

Abstract. Climate change threatens both the accretion and erosion processes that sustain coral reefs. Secondary calcification, bioerosion, and reef dissolution are integral to the structural complexity and long-term persistence of coral reefs, yet these processes have received less research attention than reef accretion by corals. In this study, we use climate scenarios from RCP 8.5 to examine the combined effects of rising ocean acidity and sea surface temperature (SST) on both secondary calcification and dissolution rates of a natural coral rubble community using a flow-through aquarium system. We found that secondary reef calcification and dissolution responded differently to the combined effect of pCO2 and temperature. Calcification had a non-linear response to the combined effect of pCO2 and temperature: the highest calcification rate occurred slightly above ambient conditions and the lowest calcification rate was in the highest temperature–pCO2 condition. In contrast, dissolution increased linearly with temperature–pCO2 . The rubble community switched from net calcification to net dissolution at +271 μatm pCO2 and 0.75 °C above ambient conditions, suggesting that rubble reefs may shift from net calcification to net dissolution before the end of the century. Our results indicate that (i) dissolution may be more sensitive to climate change than calcification and (ii) that calcification and dissolution have different functional responses to climate stressors; this highlights the need to study the effects of climate stressors on both calcification and dissolution to predict future changes in coral reefs.


2014 ◽  
Vol 11 (9) ◽  
pp. 12799-12831 ◽  
Author(s):  
N. J. Silbiger ◽  
M. J. Donahue

Abstract. Climate change threatens both the accretion and erosion processes that sustain coral reefs. Secondary calcification, bioerosion, and reef dissolution are integral to the structural complexity and long-term persistence of coral reefs, yet these processes have received less research attention than reef accretion by corals. In this study, we use climate scenarios from RCP8.5 to examine the combined effects of rising ocean acidity and SST on both secondary calcification and dissolution rates of a natural coral rubble community using a flow-through aquarium system. We found that secondary reef calcification and dissolution responded differently to the combined effect of pCO2 and temperature. Calcification had a non-linear response to the combined effect of pCO2-temperature: the highest calcification rate occurred slightly above ambient conditions and the lowest calcification rate was in the highest pCO2-temperature condition. In contrast, dissolution increased linearly with pCO2-temperature. The rubble community switched from net calcification to net dissolution at +272 μatm pCO2 and 0.84 °C above ambient conditions, suggesting that rubble reefs may shift from net calcification to net dissolution before the end of the century. Our results indicate that dissolution may be more sensitive to climate change than calcification, and that calcification and dissolution have different functional responses to climate stressors, highlighting the need to study the effects of climate stressors on both calcification and dissolution to predict future changes in coral reefs.


2011 ◽  
Vol 44 (2) ◽  
pp. 126-136 ◽  
Author(s):  
I. V. Kovda ◽  
M. P. Lebedeva ◽  
N. P. Chizhikova ◽  
G. L. Zhang ◽  
Z. T. Gong ◽  
...  

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