The intracellular pathogen Mycobacterium tuberculosis (Mtb) is exposed to multiple host antimicrobial pathways, including toxic gases such as superoxide, nitric oxide and carbon monoxide (CO). To survive, mycobacteria evolved mechanisms to resist the toxic environment, and in this review we focus on a relatively new field, namely, the role of macrophage heme oxygenase and its enzymatic product ...

Direct toxic injury to turfgrasses by atmospheric pollutants is a new factor affecting the growth and look of turfgrasses. Although the complete loss of a turf from these toxic atmospheric gases or aerosols has rarely been observed to date, the injurious effects, however, a) reduce drastically the visual quality of turfgrass, b) lowers carbohydra te reserve because of injury to plant chlorophyl...

Due to the rise in global temperature and climate change, detection of CO2, SO2 NO pollutants is important smart cities. In this paper, an H-shaped photoacoustic cell utilized for low-concentration gases. The geometry miniaturized designed with specific parameters order increase its efficiency performance. eliminates problems such as bulkiness cost, which prevent use sensors detecting greenhous...

Abstract The paper presents a comparative analysis of experimental data on combustion liquid hydrocarbon fuels in the presence superheated steam two designs developed burners. By example diesel fuel burnt spray burner it is shown that lower values nitrogen oxide contents exhaust gases are achieved comparison with an evaporative burner. At that, content carbon monoxide some regimes for minimum t...

A new optical tool, which will help petrochemical refinery and chemical processing plant personnel locate the source of a toxic or hazardous gas leak while remaining outside the perimeter of the processing area, has been demonstrated. This sensor is capable of locating leaks from a distance of about 20 m, with a response time of less than 1 second. By enhancing the speed with which leaks can be...

Nitrogen oxides (monoxide and dioxide) known in environmental chemistry as NOx are toxic atmospheric polluting gases of great importance for health. In this way, is necessary NOx: a) structural study properties, b) control, particular anthropogenic origin, c) relationship between concentration paper, molecular structure significant properties addressed, using modeling tools carried out Spartan®...

gases such as no and co play important roles both in normal physiology and in disease. in recent years, interest has been directed towards other naturally occurring gases, notably h 2 s, which is produced in body by three enzymes namely cbs (cystathionine beta synthase), cse (cystathionine gamma lyase) and mst (3-mercaptopyruvate sulfurtransferase), present in mitochondria and/or cytosols where...

Bronchiolitis obliterans (BO) is a rare disease involving concentric bronchiolar fibrosis that develops rapidly following inhalation of certain irritant gases at sufficiently high acute doses. While there are many potential causes of bronchiolar lesions involved in a variety of chronic lung diseases, failure to clearly define the clinical features and pathological characteristics can lead to am...

Toxic and harmful gases may follow evacuees into the mine refuge chamber, endangering their life during disaster. Gases from outside environment are successfully kept out of chamber by air curtains. The effect curtain installation position, jet velocity, angle, structural parameters on CO barrier efficiency is studied using numerical simulation computational fluid dynamics (CFD) in this paper. ...