scholarly journals Effect of Magnesium Ion Concentration on the Types of Crystals Deposited by Marine Bacteria in Sea Water

1975 ◽  
Vol 41 (8) ◽  
pp. 913-913 ◽  
Author(s):  
Haruo SHINANO ◽  
Minoru SAKAI
Keyword(s):  
Marine Bacteria ◽  
Sea Water ◽  
Ion Concentration ◽  
Magnesium Ion

The Effects of Freezing on Marine Bacteria.: I. Quantitative Studies.

1934 ◽  
Vol 1 (2) ◽  
pp. 95-108 ◽  
Author(s):  
Ernest Hess
Keyword(s):  
Marine Bacteria ◽  
Sea Water ◽  
Freezing Temperature ◽  
Ion Concentration ◽  
Distilled Water ◽  
Hydrogen Ion Concentration ◽  
Quantitative Studies ◽  
Repeated Freezing ◽  
Resistant Strains ◽  
Optimum Salt Concentration

When marine bacteria were exposed to a moderate freezing temperature, −16 °C., for short periods, sea-water offered greater protection than broth media or distilled water. Reduction in number of bacteria was least severe in broth media of optimum salt-concentration and hydrogen ion concentration. During freezing in distilled water, transfer of bacteria from the crystallizing portion to the liquid part occurred. Old strains were more resistant to freezing, and previous cultivation at −3° produced more resistant strains. A higher percentage of cells were killed by freezing at lower freezing temperatures, by prolonged freezing, rapid freezing and repeated freezing. In truly super-cooled sea-water higher percentage reduction occurred than in frozen sea-water at −6.5° and −10°.

scholarly journals The Hydrogen-ion Concentration of Sea Water

Nature ◽  
1923 ◽  
Vol 111 (2778) ◽  
pp. 132-133
Author(s):  
J. J.
Keyword(s):  
Sea Water ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration

Thermal stability of ribosomes from a thermophilic and a mesophilic fungus

1973 ◽  
Vol 19 (6) ◽  
pp. 761-763 ◽  
Author(s):  
H. M. Miller ◽  
M. G. Shepherd
Keyword(s):  
Thermal Stability ◽  
Ion Concentration ◽  
Magnesium Ion ◽  
Penicillium Notatum ◽  
Ribosomal Subunits ◽  
Ion Concentrations ◽  
Thermal Stability Of

Ribosomes and ribosomal subunits from the thermophile Penicillium duponti were found to be more thermostable than the corresponding particles from the mesophile Penicillium notatum. The thermostability of the ribosomes from both organisms was dependent on magnesium ion concentration. The dissociation of the 80-S ribosomes into 60-S and 40-S subunits occurred at higher magnesium ion concentrations for the mesophile than the thermophile.

scholarly journals Inorganic nitrogen utilization by assemblages of marine bacteria in sea-water culture

1988 ◽  
Vol 50 ◽  
pp. 147-150 ◽  
Author(s):  
SG Horrigan ◽  
A Hagstrom ◽  
I Koike ◽  
F Azam
Keyword(s):  
Marine Bacteria ◽  
Sea Water ◽  
Inorganic Nitrogen ◽  
Nitrogen Utilization ◽  
Water Culture

The coral reef-dwelling Peneroplis spp. shows calcification resilience to ocean acidification conditions - results from culture experiments

2021 ◽  
Author(s):  
Laurie Charrieau ◽  
Katsunori Kimoto ◽  
Delphine Dissard ◽  
Beatrice Below ◽  
Kazuhiko Fujita ◽  
...  
Keyword(s):  
Coral Reefs ◽  
Ocean Acidification ◽  
Sea Water ◽  
General Structure ◽  
Ion Concentration ◽  
Large Benthic Foraminifera ◽  
Carbonate Ion ◽  
Short Period

<p>Ocean acidification is a consequence of current anthropogenic climate changes. The concomitant decrease in pH and carbonate ion concentration in sea water may have severe impacts on calcifying organisms. Coral reefs are among the first ecosystems recognized vulnerable to ocean acidification. Within coral reefs, large benthic foraminifera (LBF) are major calcium carbonate producers.</p><p>The aim of this study was to evaluate the effects of varying pH on survival and calcification of the symbiont-bearing LBF species <em>Peneroplis</em> spp. We performed culture experiments to study their resistance to ocean acidification conditions, as well as their resilience once placed back under open ocean pH (7.9).</p><p>After three days, small signs of test decalcification were observed on specimens kept at pH 7.4, and severe test decalcification was observed on specimens kept at pH 6.9, with the inner organic lining clearly appearing. After 32 days under pH 7.4, similar strongly decalcified specimens were observed. All the specimens were alive at the end of the experiment. This result demonstrates the resistance of <em>Peneroplis </em>spp. to an acidified pH, at least on a short period of time.</p><p>After being partially decalcified, some of the living specimens were placed back at pH 7.9. After one month, the majority of the specimens showed recalcification features, mostly by addition of new chambers. The trace elements concentrations of the newly formed chambers were analysed by LA-ICPMS. Interestingly, more chambers were added when food was given, which highlights the crucial role of energy source in the recalcification process. Moreover, the newly formed chambers were most of the time abnormal, and the general structure of the tests was altered, with potential impacts on reproduction and in situ survival. In conclusion, if symbiont-bearing LBF show some resistance and resilience to lowered pH conditions, they will remain strongly affected by ocean acidification.</p>

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