Insights into the storage stability of ammonia in polyester aluminum bags.

A list of gaseous odorants such as ammonia (and hydrogen sulfide) are generally collected using rigid containers or flexible bags for quantitative analysis. The aim of this investigation was to assess the stability of polyester aluminum bags used for gaseous ammonia sampling and storage. To this end, ammonia standards were prepared at two concentration levels of low (7.8 ppm) and high concentrations (39 ppm) and stored in the polyester ammonia bags for durations of 0, 1, 2, 4, and 6 days. These samples were then analyzed at each interval by an impinger-based indophenol method utilizing a spectrophotometer. At each pre-set period, three different mass loadings of ammonia samples were collected from the storage bag to obtain response factors (RF) for comparison between different elapsed times set for the storage. Subsequently, the relative recovery values for each interval were computed by dividing the RF for each sampling day by that of the 0th day. The relative recovery values for low and high concentration standards decreased with increasing storage time as 82.9% (day 1) to 36% (day 6) and 89.9% (day 1) to 59.7% (day 6), respectively. As such, the potentially superior recovery of ammonia from polyester aluminum bags was demonstrated (e.g., relative to other storage options introduced previously) to support its practical merit as storage media.

Recent advancements in bioremediation of dye: Current status and challenges.

The rampant industrialization and unchecked growth of modern textile production facilities coupled with the lack of proper treatment facilities have proliferated the discharge of effluents enriched with toxic, baleful, and carcinogenic pollutants including dyes, heavy metals, volatile organic compounds, odorants, and other hazardous materials. Therefore, the development of cost-effective and efficient control measures against such pollution is imperative to safeguard ecosystems and natural resources. In this regard, recent advances in biotechnology and microbiology have propelled bioremediation as a prospective alternative to traditional treatment methods. This review was organized to address bioremediation as a practical option for the treatment of dyes by evaluating its performance and typical attributes. It further highlights the current hurdles and future prospects for the abatement of dyes via biotechnology-based remediation techniques.

Visible Enamel Defects in Adolescents: How Do their Peers View Them?

AIM: The present study was aimed to determine whether adolescents make social judgments about other children who have noticeable enamel imperfections. MATERIALS AND METHODS: Two schools with very different socio-economic profiles were selected using a stratified random sampling method. Children aged 13-14 years (school class 9) and 15-16 (school class 11) were randomly selected from these schools totaling to a sample size of 200. Half the participants rated full-face photographs of a boy and girl without an enamel defect, and the other half-rated the same two photographs with the digitally modified incisors. The photographic subjects were rated on a four-point Likert's scale consisting of six positive and five negative descriptors. RESULTS: Based on the gender of the photographic subject, the mean total attribute score was almost identical. However, it was lower for photographic subjects showing enamel defects as compared to those without. CONCLUSION: The dental appearance can influence value judgments in children. CLINICAL SIGNIFICANCE: It is important to treat the enamel lesions and various developmental defects of the enamel as it may lead to a negative social judgment by peers. HOW TO CITE THIS ARTICLE: Nayak UA, Pawar A, Kappadi D, Prajapati D, Roy KJ, Wadhwa S. Visible Enamel Defects in Adolescents: How Do their Peers View Them?. Int J Clin Pediatr Dent, 2018;11(6):479-482.