Continuous pH Monitoring Using the Paratrend® 7 Inserted into a Peripheral Vein in a Patient with Shock and Congenital Lactic Acidosis

Cold Bitumen Emulsion (CBE) mixture technologies have been recently developed to lower pavement construction temperatures to reduce environmental costs and control gas emissions. Due to its poor early mechanical strength, active fillers (i.e., cement) have been used to obtain high early stiffness in order to have the potential for timely construction of the next layer. There is, however, a lack of understanding about the impact of active fillers on the viscoelastic behavior and fatigue damage resistance of CBE mastics. This study, therefore, aims to identify the influence of active fillers on the rheological properties and the resulting fatigue behavior of CBE mastic, supported by chemical analysis for the filler-bitumen emulsion. For this aim, bitumen emulsion was mixed separately with seven fillers/blended fillers to prepare the CBE mastics. Various experiments, including continuous pH monitoring tests (chemical reactivity of filler-bitumen emulsion), Strain Sweep (SS) tests, Temperature-Frequency Sweep (TFS) tests, Time Sweep (TS) tests, and Linear Amplitude Sweep (LAS) tests were conducted on the CBE binder and the prepared mastics. Results show that the rheological performance and the fatigue damage resistance depend not only on the filler inclusions but also on filler type and chemistry. On this basis, the rise in complex shear modulus and the decrease in the viscous component is associated with a significant enhancement in fatigue performance for specific fillers.

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Continuous pH monitoring with monocrystalline antimony electrodes: Toxicity considerations from studies on heparinized human plasma

Scandinavian Journal of Clinical and Laboratory Investigation ◽

10.3109/00365518309168442 ◽

1983 ◽

Vol 43 (6) ◽

pp. 539-542 ◽

Cited By ~ 4

Author(s):

E. Nilsson ◽

G. Edwall

Keyword(s):

Human Plasma ◽

Ph Monitoring ◽

Monocrystalline Antimony ◽

Continuous Ph Monitoring

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Evaluation of gastrointestinal transit times and pH in healthy cats using a continuous pH monitoring system

Journal of Feline Medicine and Surgery ◽

10.1177/1098612x211062096 ◽

2021 ◽

pp. 1098612X2110620

Author(s):

Naila J Telles ◽

Bradley T Simon ◽

Elizabeth M Scallan ◽

Emily N Gould ◽

Mark G Papich ◽

...

Keyword(s):

Monitoring System ◽

Ph Monitoring ◽

Gastrointestinal Transit ◽

Individual Variability ◽

Feeding Period ◽

Non Invasive ◽

Post Feeding ◽

Transit Times ◽

Gi Transit ◽

Continuous Ph Monitoring

Objectives The aim of this study was to characterize gastrointestinal (GI) transit times and pH in healthy cats. Methods GI transit times and pH were measured in six healthy, colony-housed, purpose-bred spayed female cats using a continuous, non-invasive pH monitoring system in a sequential order design. For the first period (‘pre-feeding’), food was withheld for 20 h, followed by oral administration of a pH capsule. Five hours post-capsule administration, cats were meal-fed by offering them their daily allowance of food for 1 h. For the second period (‘post-feeding’), food was withheld for 24 h and cats were fed for 1 h, after which a pH capsule was orally administered. Studies in both periods were repeated three times. GI transit times and pH were compared between the two periods. Results The median transit times for the pre- and post-feeding periods, respectively, were: gastric –94 mins (range 1–4101) and 1068 mins (range 484–5521); intestinal –1350 mins (range 929–2961) and 1534 mins (range 442–2538); and GI –1732 mins (range 1105–5451) and 2795 mins (range 926–6563). The median GI pH values for the first and second periods, respectively, were: esophageal –7.0 (range 3.5–7.8) and 4.5 (range 2.9–6.4); gastric –2.7 (range 1.7–6.2) and 2.0 (range 1.1–3.3); intestinal –8.2 (range 7.6–8.7) and 7.8 (range 6.7–8.5); first-hour small intestinal –8.2 (range 7.4–8.7) and 8.3 (range 7.9–8.6); and last-hour large intestinal –8.5 (range 7.0–8.9) and 7.8 (range 6.3–8.7). Gastric ( P <0.0020) and intestinal pH ( P <0.0059) were significantly increased in the pre-feeding period compared with the post-feeding period. Conclusions and relevance Gastric and intestinal pH differed significantly when the capsule was administered 5 h prior to feeding compared with 1 h after feeding. Transit times for both periods showed high degrees of intra- and inter-individual variability.

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