Orthodontics has been developing for 282 years. We can distinguish an initial period when practitioners limited themselves to ‘‘straightening’’ teeth that were out of position. Then, under the influence of Edward Hartley Angle, they devoted their efforts to correcting ‘‘malocclusions.’’ Now, during its third period, orthodontics has divided itself into two branches. The American school believes...

The sensing characteristics of a yttria-stabilized zirconia (YSZ)-based sensor utilizing a NiO sensing-electrode (SE) towards toluene (C(7)H(8)) and interfering gases (C(3)H(6), H(2), CO, NO(2) and C(2)H(5)OH) were evaluated with a view to selective C(7)H(8) monitoring in indoor atmospheres. The fabricated YSZ-based sensor showed preferential responses toward 480 ppb C(2)H(5)OH, rather than the...

Abstract Background COVID-19 vasculopathy is a critical condition that impacts the disease prognosis including vasculitis and thromboembolic complications. This study aimed to provide Egyptian experience about during past two years of pandemic collectively include different modalities imaging techniques for diagnosis cerebrovascular, pulmonary, gastrointestinal, peripheral arterial vascular Res...

BACKGROUND It is possible to measure nitric oxide (NO) levels in exhaled air. The absolute concentrations of exhaled NO obtained by separate workers in similar patient groups and normal subjects with apparently similar techniques have been very different. A study was undertaken to determine whether changes in measurement conditions alter the concentration of exhaled NO. METHOD NO concentratio...

Meat is very rich and convenient source of nutrients including also a large extent of microelements. Contamination with heavy metals is a serious threat because of their toxicity, bioaccumulation and biomagnifications in the food chain. The lead concentrations depend on the environmental conditions and the food production methods. Ingestion of contaminants, especially heavy metals, by animals c...

In the present study, nitrogen doped biochar (N-PPB) and activated (AN-PPB) were prepared used for removing bisphenol A (BPA) in water through activating peroxymonosulfate. It was found from results that N-PPB exhibited superior catalytic performance over pristine since could brought about abundant active sites to structure. The non-radical singlet oxygen (1O2) determined be dominant species re...

The first microRNAs were discovered some 20 years ago, but only a small fraction of the microRNA-encoding genes have been described in detail yet. Here we report the molecular analysis of a computationally predicted Drosophila melanogaster microRNA gene, mir-282. We show that the mir-282 gene is the source of a 4.9-kb-long primary transcript with a 5' cap and a 3'-poly(A) sequence and a mature ...

Secchi depth has been measured in Lake Tahoe an average of every 12 d since July 1967. Because of the unusual clarity of the lake, Secchi depth measurement is responsive to small changes in light-attenuating particles, and the record exhibits strong variability at the seasonal, interannual, and decadal scales. Using recently developed methods of applied time-series analysis, the mechanisms of c...

The concept of incremental aerosol reactivity is introduced, and the incremental aerosol reactivities of a number of important anthropogenic and biogenic hydrocarbons are investigated for four ambient scenarios. The incremental aerosol reactivity, defined as a change in the secondary organic aerosol mass produced (in μg m-3) per unit change of parent organic reacted (in ppb), is a measure of th...