Agriculture
Silks superpowers
Where Have All the Bees Gone?
Hungry bug seeks hot meal
Amphibians
Bullfrogs
Tree Frogs
Newts
Animals
Lucky Survival for Black Cats
Ultrasonic Frogs Raise the Pitch
Crocodile Hearts
Behavior
Eating Troubles
Night of the living ants
Wake Up, Sleepy Gene
Birds
Geese
Dodos
Roadrunners
Chemistry and Materials
Moon Crash, Splash
Sticky Silky Feet
Undercover Detectives
Computers
Getting in Touch with Touch
Hubble trouble doubled
A New Look at Saturn's rings
Dinosaurs and Fossils
Digging for Ancient DNA
Battling Mastodons
South America's sticky tar pits
E Learning Jamaica
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Earth
Shrinking Glaciers
In Antarctica watch the heat (and your step)
Ancient Heights
Environment
Improving the Camel
Pollution Detective
A Change in Time
Finding the Past
Early Maya Writing
Watching deep-space fireworks
The Puzzle of Ancient Mariners
Fish
Halibut
White Tip Sharks
Tuna
Food and Nutrition
Symbols from the Stone Age
Packing Fat
Chew for Health
GSAT English Rules
Who vs. Whom
Problems with Prepositions
Finding Subjects and Verbs
GSAT Exam Preparation Jamaica
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Exams Jamaica Scholarships
GSAT Practice Papers | GSAT Mathematics | Maths
2014 GSAT Results for Jamaican Kids
Access denied - Disabled boy aces GSAT
GSAT Mathematics
Detecting True Art
A Sweet Advance in Candy Packing
How to Slice a Cake Fairly
Human Body
Nature's Medicines
Electricity's Spark of Life
What the appendix is good for
Invertebrates
Shrimps
Mosquitos
Moths
Mammals
Marmots
Hamsters
Donkeys
Parents
Expert report highlights the importance to parents of reading to children!
Children and Media
Choosing a Preschool: What to Consider
Physics
Strange Universe: The Stuff of Darkness
The Pressure of Scuba Diving
The Particle Zoo
Plants
Underwater Jungles
When Fungi and Algae Marry
Nature's Alphabet
Reptiles
Gila Monsters
Pythons
Komodo Dragons
Space and Astronomy
Asteroid Lost and Found
A Family in Space
A Planet's Slim-Fast Plan
Technology and Engineering
A Light Delay
Supersuits for Superheroes
Are Propellers Fin-ished?
The Parts of Speech
Pronouns
Problems with Prepositions
Countable and Uncountable Nouns
Transportation
Middle school science adventures
Troubles with Hubble
Ready, unplug, drive
Weather
Arctic Melt
Where rivers run uphill
Recipe for a Hurricane
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 m in length and 250 to 320 m 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™