Agriculture
Chicken Eggs as Drug Factories
Vitamin D-licious Mushrooms
Middle school science adventures
Amphibians
Salamanders
Tree Frogs
Toads
Animals
Helping the Cause of Macaws
Walks on the Wild Side
Fishy Sounds
Behavior
The Other Side of the Zoo Fence
Diving, Rolling, and Floating, Alligator Style
Memory by Hypnosis
Birds
Mockingbirds
Birds We Eat
Storks
Chemistry and Materials
Putting the Squeeze on Toothpaste
The Incredible Shrunken Kids
Sugary Survival Skill
Computers
Graphene's superstrength
Games with a Purpose
Play for Science
Dinosaurs and Fossils
Fossil Fly from Antarctica
A Living Fossil
Message in a dinosaur's teeth
E Learning Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
Earth
Weird, new ant
Slower Growth, Greater Warmth
Wave of Destruction
Environment
A Change in Leaf Color
Will Climate Change Depose Monarchs?
Power of the Wind
Finding the Past
An Ancient Childhood
Stone Tablet May Solve Maya Mystery
Prehistoric Trips to the Dentist
Fish
Catfish
Skates
Tiger Sharks
Food and Nutrition
The mercury in that tuna
Allergies: From Bee Stings to Peanuts
Turning to Sweets, Fats to Calm the Brain
GSAT English Rules
Capitalization Rules
Pronouns
Who vs. That vs. Which
GSAT Exam Preparation Jamaica
Mastering The GSAT Exam
Results of GSAT are in schools this week
GSAT Exam Preparation
GSAT Exams Jamaica Scholarships
GSAT Exam Preparation
GSAT stars reap scholarship glory
Results of GSAT are in schools this week
GSAT Mathematics
Math is a real brain bender
Math Naturals
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Human Body
Hey batter, wake up!
Gut Microbes and Weight
Workouts: Does Stretching Help?
Invertebrates
Crabs
Bedbugs
Fleas
Mammals
African Ostrich
Doberman Pinschers
Tasmanian Devil
Parents
The Surprising Meaning and Benefits of Nursery Rhymes
How children learn
Choosing a Preschool: What to Consider
Physics
Strange Universe: The Stuff of Darkness
The Mirror Universe of Antimatter
Gaining a Swift Lift
Plants
Plants Travel Wind Highways
Seeds of the Future
Pumping Up Poison Ivy
Reptiles
Reptiles
Crocodilians
Snakes
Space and Astronomy
An Icy Blob of Fluff
Saturn's Spongy Moon
Chaos Among the Planets
Technology and Engineering
A Light Delay
Beyond Bar Codes
Dancing with Robots
The Parts of Speech
Countable and Uncountable Nouns
What is a Preposition?
Pronouns
Transportation
Charged cars that would charge
Morphing a Wing to Save Fuel
Revving Up Green Machines
Weather
Science loses out when ice caps melt
Recipe for a Hurricane
Watering the Air
Add your Article

Dust Mites

The house dust mite (sometimes abbreviated by allergists to HDM), is a cosmopolitan guest in human habitation. Dust mites flourish in the controlled environment provided to them by buildings. In nature they are killed by predators and by exposure to direct sun rays. Dust mites are considered to be the most common cause of asthma and allergic symptoms worldwide. The enzymes they produce can be smelled most strongly in full vacuum cleaner bags. It is just possible to see a dust mite under a magnifying glass, when the subject is well lit and placed on a black background. A typical house dust mite measures 420 Ám in length and 250 to 320 Ám in width. Both male and female adult house dust mites are globular in shape, creamy white and have a striated cuticle. A member of the phylum Arthropoda, post-larval stages of house dust mites have eight legs; larval stages have six legs. Dust mites can be transported airborne by the minor air currents generated by normal household activities The dust mite survives in all climates, except at high altitudes where reproduction is halted. A necessary condition for growth (digestion and reproduction) is sufficient absolute humidity. Relative humidity is not a good measure since it varies with temperature. When humidity is less than optimal, dust mites function more slowly, and eventually become dormant. Dust mites thrive in the environment provided by beds, kitchens and homes in general, where the sun's rays do not reach them. Mites remain in mattresses, carpets, furniture and bedding, since they can climb lower down through the fabric to avoid sun, vacuum cleaners, and other hazards, and climb higher up to the surface if necessary to get another skin cell to feed on, when humidity is high. Even in dry climates, dust mites survive and reproduce easily in bedding (especially in pillows) because of the humidity generated by the human body during several hours of breathing and perspiring. Dust mites consume minute particles of organic matter. Some species of mites prefer to eat skin cells, a large component of household dust; others prefer flour dust. Dust mites have a rudimentary alimentary system (no stomach) and require most digestion to occur outside their body. For this reason they secrete enzymes and deposit the fungus Aspergillus repens on dust particles, to enable the fungus to pre-digest the organic matter with its enzymes. Dust mites eat the same particle several times, only partially digesting it each time. Between feedings dust mites leave particles to decompose further. Ultimately a fully digested particle, which a dust mite will not eat, is deemed by scientists to constitute fecal matter. On average, a person sheds about 1.5 grams of skin cells and flakes every day (approximately 0.3-0.45 kg per year), which is enough to feed roughly a million dust mites under ideal conditions. Dust mites in bedding derive moisture from human breathing, perspiration, and saliva. Asthma The house dust mite's partially digested food, and fecal matter, is one of the most significant sources of allergens, implicated in allergic asthma, rhinitis, conjunctivitis and dermatitis. One of the more important proteins responsible for the allergic reaction is DerP1, a protease digestive enzyme found in mite feces. Dust mites bodies, made of chitin, are also allergens. Immunotherapy or "allergy shots" have been helpful for sufferers of hay fever and asthma. Steam cleaners may be effective at reducing enzyme allergens since the heat of the steam breaks down (decomposes) the compound. The average life cycle for a male dust mite is 20 to 30 days, while a mated female dust mite can live for 10 weeks, laying 60 to 100 eggs in the last 5 weeks of her life. In a 10 week life span, a dust mite will produce approximately 2000 fecal particles and an even larger number of partially digested enzyme-infested dust particles. Bleach and strong soaps do not kill dust mites. A simple washing will remove most, in the waste water. Temperatures of over 60 degrees Celsius (140 degrees Fahrenheit) for a period of one hour are usually fatal to dust mites; freezing may also be fatal. Dust mites reproduce quickly enough that their effect on human health can be significant.

Dust Mites
Dust Mites








Designed and Powered by HBJamaica.com™