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Abstract Background As real-time quantitative PCR (RT-QPCR) is increasingly being relied upon for the enforcement of legislation and regulations dependent upon the trace detection of DNA, focus has increased on the quality issues related to the technique. Recent work has focused on the identification of factors that contribute towards significant measurement uncertainty in the real-time quantitative PCR technique, through investigation of the experimental design and operating procedure. However, measurement uncertainty contributions made during the data analysis procedure have not been studied in detail. This paper presents two additional approaches for standardising data analysis through the novel application of statistical methods to RT-QPCR, in order to minimise potential uncertainty in results. Results Experimental data was generated in order to develop the two aspects of data handling and analysis that can contribute towards measurement uncertainty in results. This paper describes preliminary aspects in standardising data through the application of statistical techniques to the area of RT-QPCR. The first aspect concerns the statistical identification and subsequent handling of outlying values arising from RT-QPCR, and discusses the implementation of ISO guidelines in relation to acceptance or rejection of outlying values. The second aspect relates to the development of an objective statistical test for the comparison of calibration curves. Conclusion The preliminary statistical tests for outlying values and comparisons between calibration curves can be applied using basic functions found in standard spreadsheet software. These two aspects emphasise that the comparability of results arising from RT-QPCR needs further refinement and development at the data-handling phase. The implementation of standardised approaches to data analysis should further help minimise variation due to subjective judgements. The aspects described in this paper will help contribute towards the development of a set of best practice guidelines regarding standardising handling and interpretation of data arising from RT-QPCR experiments.

Background: Opioid misuse is a pervasive, worsening problem that affects the health of people throughout the United States, including adolescents. There are few adolescent-focused interventions designed to educate them about opioid medication safety. The MedSMARxT: Adventures in PharmaCity, is a serious educational video game that teaches parents and their youths about safe opioid practices., Objective: This study aimed to elucidate parent's perceptions of MedSMARxT: Adventures in PharmaCity and its potential use by parents and their adolescents., Methods: Parents of adolescents aged 12 to 18 years who live in the United States were recruited from April to October 2021 via Qualtrics research panels, social media, email listserves, and snowball sampling. The study participants played MedSMARxT: Adventures in PharmaCity for 30 minutes and then participated in a 30-minute postgame interview via WebEx (Cisco). Questions were developed and piloted to examine adults' perceptions of the game. Participants were asked three sets of open-ended questions: (1) questions about the game and elements of the game, (2) what they learned from the game, and (3) questions about their experience with games. Audio recordings were transcribed verbatim. Interview transcripts were coded using content and thematic analysis by study team members to identify major themes and subthemes from the data., Results: Parent participants (N=67) played MedSMARxT: Adventures in PharmaCity and completed a postgame interview. Analysis extrapolated four primary themes from the data: (1) participant gaming experience, (2) perception of game features, (3) educational purpose of the game, and (4) future use of the game. Most participants (n=56, 84%), had at least some experience with video games. More than half of the participants (n=35, 52%) participants, had positive reactions to the game characters and scenes depicted in MedSMARxT: Adventures in PharmaCity and stated they were realistic for adolescents. Most participants (n=39, 58%), would recommend the game to others. Significant difficulties with gameplay navigation were reported by 38 (57%) participants, as well as a slow game pace. All participants were able to accurately identify the overarching goal of the game: opioid or medication safety. The game reinforced existing knowledge for participants, though many (n=15, 22%), reported a new awareness of the need to store opioid medications in a locked area and the availability of medication disposal drop boxes at pharmacies. Participants stated that they would recommend the game for future use by families and youths in various health care and non-health care settings., Conclusions: The use of a tailored serious game is a novel, engaging tool to educate adolescents on opioid safety. MedSMARxT: Adventures in PharmaCity can be used as a tool for parents and adolescents to facilitate meaningful dialogue about safe and appropriate opioid use., (©Olufunmilola Abraham, Grace Ann Nixon, Laura Louise Seitz. Originally published in JMIR Serious Games (https://games.jmir.org), 12.09.2023.)

The premarket testing of household cleaning products for dermal irritancy is best achieved via human testing. Animal dermal irritation testing is generally limited to screening for possible dermal hazard of totally new or unique products or ingredients prior to human testing or to meeting regulatory requirements of government bodies. Alternatives to animal tests are being sought; however, until such time that these alternatives are identified, validated, and accepted by government bodies, the judicious use of animal testing remains a necessity. Modifications to standard animal skin irritation test procedures have been evaluated against human skin irritation results with the objective of defining one method that could be used in place of current standard procedures that differ slightly from one another, and thereby avoid excessive and redundant use of animals. Hill Top Chambers (19 mm) and standard gauze patches (U.S. Department of Transportation procedure) were used to obtain comparative irritation responses for 24 cleaning products, common caustics, and acids in rabbits and humans. Exposure times were 1 or 4 hr, and responses were graded over a 72-hr period. Results indicate that use of the Chamber offers the potential to (1) reduce the number of animals used for skin irritation screening (smaller group size and up to eight test substances/concentrations per animal); (2) eliminate the need for conducting multiple tests to satisfy different governmental requirements; and (3) reduce animal stress by reducing exposure times without compromising the value of the irritancy patch test as a screening tool. When animal data are required, it is suggested that the use of a Chamber and other modifications of traditional test procedures offers advantages that could result in using fewer animals and/or have less potential for producing unnecessarily severe responses in animals.

Evaluation of an automated hematology instrument begins with analysis of one's practice needs, followed by analysis of initial start-up costs, cost of maintenance, and staffing. In one situation, the decision to purchase an automated instrument may allow personnel working with low-efficiency pipetting and slide chamber counting time to assist in other functions of the clinic. In another practice, an automated counter may permit in-office complete blood counts to be added to the workload of current staff. These instruments are more than time-saving conveniences. They can facilitate clinical decision making and monitoring for complications of disease and therapy by making it easier for the physician to obtain reliable hematologic results. They can generate additional practice income and reduce patient cost by improving the quality and efficiency of medical care.

Oral administration of up to 84 mg/kg of NaF to adult male rats did not induce DNA-strand breaks in testicular cells when measured by alkaline elution. Although plasma fluoride levels were as high as 12 ppm is rats given 84 mg/kg of NaF, testicular fluoride levels in most cases were only 10-20% of plasma levels. Fluoride did not accumulate in the testes after 5 daily treatments. Therefore, it is unlikely that NaF, even at high doses, poses a hazard with respect to heritable genetic effects.

Groups of eight human volunteers and eight albino rabbits, under controlled laboratory conditions, were exposed in one eye without subsequent rinsing to the same concentrations and volumes of four prototype consumer products: fabric softener, shampoo, hand soap, and laundry detergent. Dose volume was 0.10 or 0.01 ml. The dose concentrations were selected to produce moderate effects with recovery within 24 to 48 hr. Two irritation scales were employed with both human and animal subjects: the Draize scale by a technician and a medical scale used with slit lamp examination by an ophthalmologist. Eyes were examined by both graders before and after dosing at specified intervals until recovery. Mean and maximum irritation scores are presented for each grading time, method, and exposure, as are the mean hours to recovery (clearing) for each exposure. Recovery times for human eyes were consistent with those reported previously for accidental human exposures to similar materials. Correlation coefficients for time to clear, comparing human vs rabbit for each dose volume-species combination across the four test products, were 0.72, 0.1 ml-human vs 0.01 ml-rabbit; 0.66, 0.01 ml-human vs 0.01 ml-rabbit; 0.40, 0.01 ml-human vs 0.1 ml-rabbit; 0.35, 0.1 ml-human vs 0.1 ml-rabbit. Thus, recovery time obtained under conditions of the "Low-Volume" test (0.01 ml-rabbit) better correlates with human eye recovery time (either dose volume) than does recovery time under Draize test conditions (0.10 ml-rabbit).(ABSTRACT TRUNCATED AT 250 WORDS)

Some chemical which are injurious to the eye may also cause anesthesia. If the eye were unknowingly anesthetized, exposure to an irritant could go undected and cause injury. Techniques for determining whether the eye was anesthetized have been generally unreliable. Usually the technique consists of challenging the cornea with a probe and testing for a blink response. In a new method described herein, an indwelling subpalpebral lavage apparatus was surgically implanted in the dog. Through this apparatus, a test material was instilled into the eye without the animal's anticipation. Responses caused by the materials were monitored by electroencephalography. The normal response to an irritting material was increased frequency and decreased amplitude of the electroencephalogram tracing or a deflection of thepolygraph needle (blink response), or both. The method was evaluated with known eye anesthetic agents and appeared to be a useful way of detecting eye anesthesia.