Introduction A very interesting case-control study published in this issue of Jornal de Pediatria concludes that nasopharyngeal pH is significantly lower in patients with respiratory symptoms and abnormal pH-metry in comparison to those children presenting with gastroenterological symptoms. Children with respiratory symptoms and abnormal pH-metry have a more acid nasopharynx than the patients i...

Due to the lack of a proper imaging approach, a veracious pH map of normal and abnormal cell is still rare. In this work, we presented a rhodamine-salicylaldehyde combination (Rh-SA2) as a novel pH probe, which has dual sensitive units for both acidic and basic environment. This dual sensitive probe acts like a chameleon in living cells and offers the doubling guarantees for endocellular pH map...

OBJECTIVE To determine whether short time variation (STV) of fetal heart beat correlates with scalp pH measurements during labor. PATIENTS AND METHODS From 1279 deliveries, 197 women had at least one fetal scalp pH measurement. Using the CTG-Player, STVs were calculated from the electronically saved cardiotocography (CTG) traces and related to the fetal scalp pH measurements. RESULTS There ...

Introduction L* value (lightness) and pH have been used as predictive tools for estimating meat quality. In general, measurement of L* value is easier and faster than pH. Woelfel et al. (2002) reported that L* value seems to be of more predictive value than pH. Broiler meat with low pH or high L* value has been associated with low water-holding capacity, which results in increased cooking loss ...

This paper aims at exploring the potential of visible and near infrared (vis-NIR) spectroscopy for on-line measurement of soil pH, with the intention to produce variable rate lime recommendation maps. An on-line vis-NIR soil sensor set up to a frame was used in this study. Lime application maps, based on pH predicted by vis-NIR techniques, were compared with maps based on traditional lab-measur...

INTRODUCTION Electronic cigarette (e-cigarette) use is increasing dramatically in developed countries, but little is known about these rapidly evolving products. This study analyzed and evaluated the chemical composition including nicotine, tobacco alkaloids, pH, and flavors in 36 e-liquids brands from 4 manufacturers. METHODS We determined the concentrations of nicotine, alkaloids, and selec...

With the advantages of small size, reliability, rapid response, compatibility to standard CMOS technology and on-chip signal processing, Ion-Sensitive Field Effect Transistor (ISFET)-based transducers are increasingly being applied in physiological data acquisition and environment monitoring. This paper presents a signal processing Application Specific Integrated Circuit (ASIC) and a discrete t...

The Accurate measurement and analysis of pH data is necessary for a multitude of applications ranging from agriculture sector to clinical laboratories. Preferably an inexpensive hand-held unit is needed for these applications. This paper presents the sensor data acquisition and data logging system including the details of its construction, capabilities and applications. PIC microcontroller has ...

BACKGROUND The diagnostic use of 24 hour oesophageal pH monitoring in infants is controversial because of the impact of feed buffering of gastric acidity. AIM To re-evaluate the effect of feeding on gastric pH and reflux using multipoint pH measurements. SUBJECTS Fifteen healthy premature infants fed every four hours. METHODS Oesophageal pH and intragastric pH at 3, 6, and 9 cm below the ...

Measurments with combination pH electrodes of the pH of the dilute buffers used in a commercial kit (CEA-Roche) for assay of carcinoembryonic antigen resulted in pH values 0.1 to 0.3 unit lower than pH values measured on an electrode system with a capillary junction. If the pH values of these buffers were adjusted, based on such measurements, an error in the assay of 0.2 to 0.6 ng/ml in the 1.5...