scholarly journals Effect of pH and Type of Stirring on the Spontaneous Precipitation of CaCO3 at Identical Initial Supersaturation, Ionic Strength and a(Ca2+)/a(CO32−) Ratio

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1075
Author(s):  
Jasminka Kontrec ◽  
Nenad Tomašić ◽  
Nives Matijaković Mlinarić ◽  
Damir Kralj ◽  
Branka Njegić Džakula
Keyword(s):  
Climate Change ◽  
Phase Composition ◽  
Ionic Strength ◽  
Marine Organisms ◽  
Hard Tissue ◽  
Chemical Basis ◽  
Physical Chemical ◽  
Initial Ph ◽  
Size And Morphology ◽  
Influence Of Ph

CaCO3 precipitation is physical-chemical basis of biomineral formation of hard tissue (shells, skeletons) in marine calcifying organisms (=biomineralization). Processes controlling biomineralization are still not fully clarified, so the study of influence of pH on basic processes of CaCO3 precipitation should contribute to better understanding of biomineralization under climate change. This paper reports on the effect of initial pH (pH0) and type of stirring (mechanical and magnetical) on spontaneous precipitation and phase composition, size and morphology of spontaneously precipitated CaCO3 formed at the identical initial supersaturation, ionic strength and a(Ca2+)/a(CO32−) ratio. The initial pH varied in a range 8.50 ≤ pH0 ≤ 10.50 and included values relevant for mimicking the conditions related to biomineralization in marine organisms. In all systems two CaCO3 polymorphs were found: calcite and/or vaterite. The increase of pH0 favoured the formation of rhombohedral calcite no matter the type of stirring. This was exclusively influenced by the systems’ pH0 (other relevant initial parameters were identical). Furthermore, increase of pH0 caused change of vaterite morphology from cauliflower-like spheroids to regular spherulites. The mechanically stirred systems produced larger calcite and vaterite particles and higher content of calcite.

Influence of pH and ionic strength on the thermal gelation behaviour of pea protein

2021 ◽  
pp. 106903
Author(s):  
Caren Tanger ◽  
Michaela Müller ◽  
David Andlinger ◽  
Ulrich Kulozik
Keyword(s):  
Ionic Strength ◽  
Pea Protein ◽  
Thermal Gelation ◽  
Influence Of Ph

scholarly journals Effects of Infectious Diseases on Population Dynamics of Marine Organisms in Chesapeake Bay

2021 ◽  
Author(s):  
Jerelle A. Jesse ◽  
M. Victoria Agnew ◽  
Kohma Arai ◽  
C. Taylor Armstrong ◽  
Shannon M. Hood ◽  
...  
Keyword(s):  
Climate Change ◽  
Population Dynamics ◽  
Infectious Diseases ◽  
Chesapeake Bay ◽  
Eastern Oyster ◽  
Marine Organisms ◽  
Ecosystem Dynamics ◽  
Climate Change Effects ◽  
Pathogen Dynamics ◽  
Growth And Reproduction

AbstractDiseases are important drivers of population and ecosystem dynamics. This review synthesizes the effects of infectious diseases on the population dynamics of nine species of marine organisms in the Chesapeake Bay. Diseases generally caused increases in mortality and decreases in growth and reproduction. Effects of diseases on eastern oyster (Crassostrea virginica) appear to be low in the 2000s compared to effects in the 1980s–1990s. However, the effects of disease were not well monitored for most of the diseases in marine organisms of the Chesapeake Bay, and few studies considered effects on growth and reproduction. Climate change and other anthropogenic effects are expected to alter host-pathogen dynamics, with diseases of some species expected to worsen under predicted future conditions (e.g., increased temperature). Additional study of disease prevalence, drivers of disease, and effects on population dynamics could improve fisheries management and forecasting of climate change effects on marine organisms in the Chesapeake Bay.

scholarly journals Evolution of Marine Organisms under Climate Change at Different Levels of Biological Organisation

Water ◽  
2014 ◽  
Vol 6 (11) ◽  
pp. 3545-3574 ◽  
Author(s):  
Ben Harvey ◽  
Balsam Al-Janabi ◽  
Stefanie Broszeit ◽  
Rebekah Cioffi ◽  
Amit Kumar ◽  
...  
Keyword(s):  
Climate Change ◽  
Marine Organisms ◽  
Different Levels ◽  
Biological Organisation

scholarly journals Formation and characterization of tannic acid/beta-glucan complexes: Influence of pH, ionic strength, and temperature

2019 ◽  
Vol 120 ◽  
pp. 748-755 ◽  
Author(s):  
Ruyi Li ◽  
Zicong Zeng ◽  
Guiming Fu ◽  
Yin Wan ◽  
Chengmei Liu ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Tannic Acid ◽  
Beta Glucan ◽  
Influence Of Ph

scholarly journals Influence of pH on the dynamics of the wound process in the postoperative period

2021 ◽  
Vol 11 (2) ◽  
pp. 87-91
Author(s):  
А. М. Morozov ◽  
А. R. Armasov ◽  
А. N. Sergeev ◽  
S. V. Zhukov ◽  
Е. А. Sobol ◽  
...  
Keyword(s):  
Postoperative Period ◽  
Ph Value ◽  
Healing Process ◽  
Hydrogen Index ◽  
Biochemical Reactions ◽  
Postoperative Wound ◽  
Wound Exudate ◽  
Initial Values ◽  
Initial Ph ◽  
Influence Of Ph

The wound process is a set of stages that successively replace each other and as a result lead to epithelization of the skin and closure of the wound defect. The development of the wound process is influenced by the pH value of the wound contents, which determines the rate of all biochemical reactions occurring in the wound. In the course of the study, patients were measured for wound exudate in the postoperative period. It was noted that in patients with the initial values of the hydrogen index, which was 7, a more effective healing process of the postoperative wound was observed, while in patients with the initial pH value of 8, the wound process took a protracted character. 

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