chemical sexual attraction

Ever wondered what causes sexual attraction between men and women? The answer may just be in the pheromones. You may not have heard or learned about this before but yes, these have been found to play a significant role in the sex life of humans.

Pheromones are chemical substances that occur naturally in humans as well as animals. These are normally emitted by a body that is fertile which give a come-on signal to the opposite sex.

Origin Of PheromonesIt was in 1956 when the first pheromone was discovered as a powerful substance in sexual attraction for silkworm moths. In their study that took 20 years, a group of German researchers found a compound from the abdomen of some 500,000 female moths that attracted male moths and caused them to flutter their wings. The beating of their wings was a signal that the males had sensed the chemical they named “bombykol.”

Chemical and biological warfare

chemical and biological warfare definition

The term is often used to cover several weapon types, including nuclear, biological, chemical (NBC) and radiological weapons. Additional terms used in a military context include atomic, biological, and chemical warfare (ABC) and chemical, biological, radiological, and nuclear (CBRN) warfare.The phrase was predominantly used in reference to nuclear weapons during the Cold War; following the collapse of the Soviet Union and increasing tensions between the Middle East and the Western powers, the term broadened to its modern, more inclusive definition. It entered widespread usage in relation to the U.S.-led 2003 invasion of Iraq.

Chemical oxygen demand

Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of ...

Hutchinson encyclopedia article about chemical oxygen demand. chemical oxygen demand. Information about chemical oxygen demand in the Hutchinson ...

chemical oxygen demand (COD)
function _f_1()
Standard method for indirect measurement of the amount of pollution (that cannot be oxidized biologically

chemical degradation of drugs

The drug solution should be exposed ...

Scholarly articles for chemical degradation of drugs
	How does residual water affect the solid-state ... - Shalaev - Cited by 53 Bioerodible polyanhydrides as drug-carrier matrices. I: ... - Leong - Cited by 305 Mechanisms of polymer degradation and erosion - Göpferich - Cited by 324

Search Results

1. Excipient development for pharmaceutical, biotechnology, and drug ... - Google Books Result

   by Ashok Katdare, Mahesh Vijay Chaubal - 2006 - Medical - 452 pages
   In addition to chemical degradation, protein drugs are susceptible to the physical ... Chemical degradation of a protein drug has also been implicated in

Chemical Waste Management

(CWM) provides Environmental Engineering Services to local and foreign countries; specialises in Water Treatment, ...
8 Feb 2006 ... Planning and Space Management, Protecting and enhancing the NIH environment ... To order containers for chemical waste volumes >2 liters, ...

As part of one of the largest network of landfills in the industry, Chemical Waste Management of the NW utilizes state-of-the-art liners, ...
BLR provides notices, regulations, news and guidelines that concern chemical waste disposal companies. Read a Chemical Waste Management Guide that covers ...

you are using chemicals, and have the potential to produce chemical waste, your area must have a Chemical Waste Management Guide (CWMG) available to all .

We have made several major revisions to our chemical waste management ...... Consult your copy of the “Chemical Waste Management” guide for additional ...
We have simplified our chemical waste labeling procedures. The multi colored hang tags have been eliminated and replaced with a single green label/hang tag.http://www.google.com.pk/search?q=chemical+waste+management&hl=en&start=30&sa=N

chemicals water treatment

At CWM, our focus in utilising proven technologies has enabled us to provide innovative water treatment solutions for municipalities and industries, delivering more clean water supply for our clients from rivers, oceans and subterranean sources, without compromising the quality of our environment.

WATER TREATMENT

Our water treatment solutions and water resource management (including river water, sea water and ground water) have served our clients' business of all sizes and scales.

	Reverse osmosis : 4
	Water treatment works : 15
	Pumping station : 7
	Distribution supply system : 2

Chemical Properties of Water

Chemical Structure
Water is a special chemical substance consisting of two atoms of hydrogen and one atom of
oxygen.

O--H bond length = 95.7 picometers
H--O---H angle = 104.5°
O-H bond energy = 450 kJ/mol
Dipole moment = 1.83 debyes

The hydrogen atoms are "attached" to one side of the oxygen atom, resulting in a water molecule
having a positive charge on the side where the hydrogen atoms are and a negative charge on the
other side, where the oxygen atom is.
Since opposite electrical charges attract, water molecules tend to attract each other,
making water kind of "sticky."
The side with the hydrogen atoms (positive charge) attracts the oxygen side (negative charge)
of a different water molecule.

The water molecule maintains a bent shape because of two considerations:
1. The tetrahedral arrangement around the oxygen.
2. The presence of lone pair electrons on the oxygen.
Two electrons not involved in the covalent bonds are called lone pair electrons.
The pairs of electrons are left alone.
These lone pairs are very negative - containing two negative electrons each - and want to
stay away from each other as much as possible.
These repulsive forces act to push the hydrogens closer together. The net result is a
terahedral arrangement.
Tetrahedral means "four-sided". It is the arrangement of four atoms around a central atom
such that the distance between them is maximized.
The arrangement adopted will be the form of a regular tetrahedron.
It has regular bond angles of 109.5°.
If we do a similar arrangement of water, putting oxygen in the center, and using the
two hydrogens and two lone pairs at the corners, we also come up with a tetrahedral
arrangement.
Because we don't "see" the electrons, the resulting tetrahedron "looks" BENT