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Showing 1 to 20 of 344 for “"low pH"”.
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Osmoregulation in teleosts by cortisol and prolactin: adaptation to low pH environments
Contains fulltext : mmubn000001_002239175.pdf (Publisher’s version ) (Open Access)
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Silica dissolution at low pH in the presence and absence of fluoride
… where -5.13 < a<sub>HF</sub> < 1.60, -0.28 < pH < 7.18, and 25 < T < 100 °C. Similarly, 97 amorphous silica dissolution rate data from published studies were analyzed using multiple linear regression to develop an empirical rate law for amorphous silica r<sub>as</sub> = 10<sup>0.48</sup> …
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Relative rates of reaction of pyrite and marcasite with ferric iron at low pH
… from various sources were determined at 25°C and pH = 2.0 in ferric chloride solutions with initial ferric iron concentrations of 10⁻³ molal. The rate of the reaction: FeS₂ + 14Fe³⁺ + 8H₂O = 15Fe²⁺ + 2SO₄²⁻ + 16H⁺ was determined by calculating the rate of reduction of aqueous ferric ion from …
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Identification and characterization of low pH-triggered conformational changes in the herpes simplex virus glycoprotein B
Herpesviruses can enter host cells by pH-dependent endocytic pathways in a cell-specific manner. The role of pH in herpesvirus endocytosis is unclear. Herpes simplex virus (HSV) is a paradigm for virus membrane fusion via a complex of glycoproteins. HSV glycoproteins B, D and the heterodimer H-L …
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The Effect of Acute Low pH on Feeding and Locomotor Activity of Larval Fathead Minnows, Pimephales promelas
Lowered pH conditions in aquatic environments can have a negative impact on many aquatic organisms. In fish it has been shown that acidic water conditions may result in altered gill morphology, reduced reproductive success, changes in locomotor and feeding behavior and even death. Juveniles and …
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Foraminiferal assemblages and test characteristics associated with natural low ph waters at Puerto Morelos reef lagoon springs, QR Mexico
… bentônicos associados a nascentes de baixo pH que simulam realisticamente projeções futuras para o final do século. Em condições de baixo pH (7.7 unidades de pH), foraminíferos aglutinantes e com endossimbiontes foram relativamente mais resistentes, respondendo positivamente às mudanças na …
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The Effects Of Ph On Enhanced Biological Phosphorus Removal (ebpr) With Propionic Acid As The Dominant Volatile Fatty Acid (vfa)
pH control is a tool to improve some aspects of Enhanced Biological Phosphorus Removal (EBPR) process. Filipe et al (2001a, 2001b, and 2001c) found strong evidence that the stability of EBPR systems can be improved by increasing the pH of the anaerobic zone, thereby creating conditions where …
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Ocean acidification influences on physiology and epigenetics in the Pacific oyster (Crassostrea gigas)
… impact marine ecosystems at unprecedented rates, phenotypicplasticity may allow organisms to withstand more stressful conditions. Genomic methods can elucidate molecular mechanisms that contribute to phenotypic plasticity, allowing for a deeper understanding of how physiological processes will be …
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The effects of acid and water hardness on bluegill embryo-larvae determined by laboratory and on-site toxicity tests
… of bluegill (<i>Lepomis macrochirus</i>) to low pH in soft (12 or 18 mg/L CaCO₃) and hard (165 or 197 mg/L CaCO₃) water was compared in five day laboratory toxiclty tests. Embryo-larval bluegill were exposed to pH levels ranging from 3.8 to 7.0 in soft water and from 3.8 to 8.0 in hard water. …
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The effect of Carbopol 934 rheological properties on the dissolution rate of sulphadamidine crystals.
… Carbopol 934 (BF Goodrich) and a model drug, sulphadimidine, were chosen because their physicochemical properties could be changed by experimental variables, namely pH, temperature and salt concentration. Three forms of sulphadimidine were produced; recrystallized, coated by coprecipitation from …
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ANTIMICROBIAL ACTIVITIES OF HISTIDINE-RICH GLYCOPROTEIN AND CATIONIC PEPTIDES
… were restored by the addition of Zn2+ or low pH. Similar results were obtained with histidine-rich peptides derived from domain 5 of kininogen and histidine-rich glycoprotein (HRGP). HRGP, an abundant heparin-binding plasma protein, exerted antimicrobial effects against Gram-positive and …
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Is aquatic invertebrate endemism in the Western Cape region of South Africa related to the fynbos blackwaters?
… and the harsh water chemistry characterized by low pH. The aim of this project was to look at the relationship between pH and endemism. Specifically I asked if there is a trichopteran and ephemeropteran fauna confined to the Cape and if this is true, I attempted to find out whether it is the …
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Acid Inactivation of Soybean Lipoxygenase and Its Effects on Protein Solubility
… protein insolubilization with various acids at low pH without heating. The effects of acid on trypsin inhibitor and urease activities in the products were also studied.
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Proton Translocation in the Bacteriorhodopsin Photocycle
From the above studies, we concluded that at low pH, the released proton is from the PRC as at neutral pH, but is delayed until the O to BR transition. The O to BR transition is rate-limited by the deprotonation of the PRC.
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A study of the pH-dependent charge of a selection of highly weathered humic soils
… from the development of positive charge at low pH in soils with variable charge which is enhanced by the amphoteric behaviour of Fe and AI oxides as well as the presence of organic matter. Aluminium tends to form stable complexes with organic matter and also competes with lower valency …
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The Synthesis of Succinic Acid and its Extraction From Fermentation Broth Using a Two-Phase Partitioning Bioreactor
… account for 70% of total production costs. Two-Phase Partitioning Bioreactors (TPPBs) can increase volumetric productivity through in-situ product removal, although SA uptake by polymers requires a pH below the pKA2 of SA (4.2). Sparging CO2 gas into the bioreactor was proposed to temporarily …
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Interactive effects of pH, temperature and exposure period on native and invasive mussels from the West Coast of South Africa
… stressors. To test this, the effects of pH, temperature, exposure period and their interactions on the performance of native and alien mussels with varying shell thickness was studied. Listed in order of decreasing shell thickness, I compared shell dissolution, shell growth, shell …
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Abiotic Factors Underlying Stress Hormone Level Variation Among Larval Amphibians
… systems. These compositional changes can act as physiological stressors towards system inhabitants. However, little is known about how these altered abiotic factors influence stress hormones (corticosterone) in larval amphibians. Throughout the following chapters, I examined the effects of …
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