Biogeochemical Cycles
... Plants and animals are broken down by still other bacteria that convert nitrogen containing organic molecules in organisms to an inorganic form of nitrogen (NH3 or NH41+) This is ammonification Once this ammonia is formed, still another group of bacteria can perform denitrification: NH3 or NH4 ...
... Plants and animals are broken down by still other bacteria that convert nitrogen containing organic molecules in organisms to an inorganic form of nitrogen (NH3 or NH41+) This is ammonification Once this ammonia is formed, still another group of bacteria can perform denitrification: NH3 or NH4 ...
PRINCIPLES OF TOXICOLOGY
... ability of a substance to have an adverse effect on the health or well-being of a human – The toxicity of a chemical depends on the degree of exposure and absorption ...
... ability of a substance to have an adverse effect on the health or well-being of a human – The toxicity of a chemical depends on the degree of exposure and absorption ...
Biogeochemical Cycles
... photosynthesis, generally passes into the atmosphere. • The sugar (known as glucose) serves a • food for all consumers in the ecosystem. • The consumers carry on a metabolic process known as cellular respiration. where oxygen is taken in from the atmosphere and used to break down the sugar resulting ...
... photosynthesis, generally passes into the atmosphere. • The sugar (known as glucose) serves a • food for all consumers in the ecosystem. • The consumers carry on a metabolic process known as cellular respiration. where oxygen is taken in from the atmosphere and used to break down the sugar resulting ...
Respiratory Irritant Gases - Military Medical Science Letters
... in the respiratory system (lungs, nose, mouth, larynx and trachea) after being inhaled. Depending on the type and amount of irritant gas inhaled, victims can experience symptoms ranging from minor respiratory discomfort to acute airway and lung injury and even death. The lungs are susceptible to man ...
... in the respiratory system (lungs, nose, mouth, larynx and trachea) after being inhaled. Depending on the type and amount of irritant gas inhaled, victims can experience symptoms ranging from minor respiratory discomfort to acute airway and lung injury and even death. The lungs are susceptible to man ...
The Importance of Bacteria (Prokayotes) Decomposers: into simpler
... 1. ____________________ is produced by the bacterium Lactobacillus. 2. Some bacteria can ________________________-- and remove human-made waste products and poisons from water. 3. Other bacteria are used to _______________________and chemicals through the techniques of genetic engineering. 4. Bacter ...
... 1. ____________________ is produced by the bacterium Lactobacillus. 2. Some bacteria can ________________________-- and remove human-made waste products and poisons from water. 3. Other bacteria are used to _______________________and chemicals through the techniques of genetic engineering. 4. Bacter ...
Hein and Arena
... compounds such as nucleic acids, or 3. Deaminated to a keto acid, which can either be used to synthesize other compounds or be oxidized to carbon dioxide and water to provide energy. ...
... compounds such as nucleic acids, or 3. Deaminated to a keto acid, which can either be used to synthesize other compounds or be oxidized to carbon dioxide and water to provide energy. ...
The Oxygen Cycle
... • 20th century pesticides were generally man made organic chemicals in a lab designed to be less toxic to humans and were capable of breaking down within the ecosystem. • However, it was found that some of these chemicals were fat soluble and became stored within animal tissues. This created a probl ...
... • 20th century pesticides were generally man made organic chemicals in a lab designed to be less toxic to humans and were capable of breaking down within the ecosystem. • However, it was found that some of these chemicals were fat soluble and became stored within animal tissues. This created a probl ...
Non-Metals
... Oxygen is a diatomic gas O2 although in the upper atmosphere it exists in the allotrope form as ozone O3 . It is a colourless odourless gas which is slightly soluble in water and has the same density as air . ...
... Oxygen is a diatomic gas O2 although in the upper atmosphere it exists in the allotrope form as ozone O3 . It is a colourless odourless gas which is slightly soluble in water and has the same density as air . ...
2.2 Nutrient Cycles in Ecosystems
... In animals, phosphorous is important for strong bones. Where Phosphorous is Found: Not in atmosphere, but in phosphate rocks (PO43–, HPO42–, H2PO4) and sediments on the ocean floor. ...
... In animals, phosphorous is important for strong bones. Where Phosphorous is Found: Not in atmosphere, but in phosphate rocks (PO43–, HPO42–, H2PO4) and sediments on the ocean floor. ...
Chemical Cycles - My Teacher Site
... of the ammonium and nitrates in the soil into free nitrogen gas. ...
... of the ammonium and nitrates in the soil into free nitrogen gas. ...
Chemical Toxicology - NC State University
... A primary irritant exerts no systemic toxic action either because the products formed on the tissue of the respiratory tract are non-toxic or because the irritant action is far in excess of any systemic toxic action. Example: hydrogen chloride. A secondary irritant's effect on mucous membranes is ov ...
... A primary irritant exerts no systemic toxic action either because the products formed on the tissue of the respiratory tract are non-toxic or because the irritant action is far in excess of any systemic toxic action. Example: hydrogen chloride. A secondary irritant's effect on mucous membranes is ov ...
Sources of CO in your home - Livingston Public Schools
... heavy physical activity. • The resulting symptoms may include pain when taking a deep breath, coughing, throat irritation, and breathing difficulties. • High concentrations of SO2 can affect lung function, worsen asthma attacks, and aggravate existing heart disease in sensitive groups. • This gas ca ...
... heavy physical activity. • The resulting symptoms may include pain when taking a deep breath, coughing, throat irritation, and breathing difficulties. • High concentrations of SO2 can affect lung function, worsen asthma attacks, and aggravate existing heart disease in sensitive groups. • This gas ca ...
06 Nitrogen Cycle - Mr. Smith`s Website
... When fossil fuels are burned, the nitrogen they contain is released into the air as nitrogen compounds. Eventually these compounds dissolve in moisture in the air and fall back to Earth. Modern farming, the burning of fossil fuels, and other human activities have more than doubled the amount of nitr ...
... When fossil fuels are burned, the nitrogen they contain is released into the air as nitrogen compounds. Eventually these compounds dissolve in moisture in the air and fall back to Earth. Modern farming, the burning of fossil fuels, and other human activities have more than doubled the amount of nitr ...
Nitrogen dioxide poisoning
Nitrogen dioxide poisoning is the illness resulting from the toxic effect of Nitrogen (II) oxide. It usually occurs after the inhalation of the gas beyond the threshold limit value.Nitrogen (II) oxide is reddish-brown with very a sharp, harsh smell at high concentrations. It is colourless and odourless at lower concentration but yet harmful. Nitrogen dioxide poisoning depends on the duration, frequency and intensity of exposure.Nitrogen (II) oxide is an irritant of the mucous membrane linked with other air pollutant that causes pulmonary diseases such as OLD, asthma, Chronic obstructive pulmonary disease and sometimes Acute exacerbation of COPD and in fatal cases, deaths.Its poor solubility in water enhances its passage and its ability to pass through the moist oral mucosa of the respiratory tract.Like most toxic gases, the dose inhaled determines the toxicity on the respiratory tract. Occupational exposures constitute the highest risk of toxicity and domestic exposure is uncommon. Prolonged exposure to low concentration of the gas may have lethal effects, as can short-term exposure to high concentrations like Chlorine gas poisoning. It is one of the major air pollutant capable of causing severe heath hazards such as Coronary artery disease as well as Stroke.Nitrogen (II) oxide is often released into the environment as a byproduct of fuel combustion but rarely released by Spontaneous combustion. Known sources of Nitrogen gas poisoning includes automobile exhaust, Power stations, The toxicity may also results from non-combustible sources such as the one released from anaerobic fermentation of food grains and Anaerobic digestion of Biodegradable waste.The WHO developed a global recommendation limiting exposures less than 20 part per billion for chronic exposure and value less 100ppb for one hour for acute exposure, using Nitrogen (II)oxide as a marker for other pollutant from fuel combustions. The standardss also based on the concentration of Nitrogen (II) oxide that show a significant and profound effects on the function of the pulmonary of asthmatic patients.Historically, some states in the U.S including Chicago and L.A have high levels of Nitrogen (II) oxide but the EPA set a standard values less than 100 ppb for one hour exposure and less than 53 ppb for chronic exposure.