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.
Monday, June 29, 2009
chemical sexual attraction
Chemical and biological warfare
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.
Sunday, June 28, 2009
Chemical oxygen demand
chemical oxygen demand (COD)
function _f_1()
Standard method for indirect measurement of the amount of pollution (that cannot be oxidized biologically
Saturday, June 27, 2009
chemical degradation of drugs
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
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
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
Reverse osmosis : 4 | |
Water treatment works : 15 | |
Pumping station : 7 | |
Distribution supply system : 2 |
Friday, June 26, 2009
Chemical Properties of Water
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
Shape-Adaptable Water-Soluble Conjugated Polymers
In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.
Wednesday, June 24, 2009
what is chemicals change ?
and chemical,s reaction , chemical compuand and also the water , hydrogen . clik this and got chemical google book , clik this link http://books.google.com.pk/books?id=IV4Cc1XFK4QC&pg=PT15&lpg=PT15&dq=chemical+change&source=bl&ots=BKr2FCAzow&sig=N_JRLdWvzLb90AmudKYupBA7czA&hl=en&ei=GxNDSveaMZD6kAWLs-WcDw&sa=X&oi=book_result&ct=result&resnum=9
Production of Gases or Solids
The formation of a gas is a clue to chemical changes. The bubbles of gas that you observed form when an antacid is dropped into water is an example of change.
Another clue that a chemical change has occurred is the formation of a solid. A solid that separates out of solution during a chemical change is called a precipitate.
Chemical found in baby food jars
The European Food Safety Authority says it has found traces of a potentially dangerous chemical in some jars. Officials said there was no need for parents to stop giving their children food from jars because the cancer risk is extremely low. However, they recommended that manufacturers consider introducing safer packaging.
Cancer-causing chemical .
The chemical, semicarbazide (SEM), has been found in very small quantities in some jars of food. The authority said the chemical was not found in any particular type of food but rather food that was packaged in a specific way.
Monday, June 22, 2009
Sengo Fine Chemical
Wild and Pure Chemical Free Non-Toxic Body & Linen Sprays
Wild and Pure Simple Body Care believes that nature provides a bountiful reserve of safe ingredients that can be used in body care products to contribute to a positive, healthy lifestyle. Wild and Pure guarantees that all of the products are clean, natural, non-toxic, not tested on animals, hypoallergenic and completely chemical free making these products favored amongst people prone to allergies and other sensitivities!
Chemical Reactions
Thursday, June 18, 2009
calcium spray
Symbol: Ca
Origin: From the word "al" or lime.
Discovery: The British Chemist Sir Humphry Davy isolated calcium in 1808 by means of electrolysis.
Properties: Calcium is ductile and malleable metal when exposed to the air rapidly tarnish to yellow. It reacts violently with water forming the hydroxide and releasing hydride. It is essential for bone and teeth development.
Uses: Plaster of Paris, deodorizer, batteries, Portland cement, medicine.
Hydrogen
Symbol: H
Origin: Named by Lavoisier which comes from the word "hydro" and "gen" which means water forming.
Discovery: Hydrogen was discovered by Henry Cavendish of Britain in 1776.
Properties: It is the most abundant element in the universe and is the lightest too. It can be obtained from mines, oil, gas wells.
Hydrogen has the simplest structure. Hydrogen as water (H2O) is very much essential to life and it is present in all organic compounds. The thermonuclear fusion of hydrogen nuclei lights and heats the universe.
Chemical Elements: Carbon and Chlorine
Discovery: Carbon was discovered since the ancient times. No known discoverer yet.
Properties: Carbon is one of the vital elements in all living things. Carbon is available in several forms including amorphous, powder and graphite rods, diamond, carbon black, bone black, coal, "bucky tubes", foil, sheet, and wire. Substances that contain carbon is called organic compounds.
Uses: It is used for pencils, dry ice, diamonds, petroleum, welding, filters.
Tuesday, June 16, 2009
What is Chemistry?
Chemistry is a science that describes the physical properties, composition, structure and reactions of matter.
To understand this definition more clearly we need to define some terms.
Atom - The smallest building block of matter.*
Molecule - Groups of atoms held together in a specific connectivity and shape
Matter - Anything that has mass and occupies space.
Fire Safe Cigarettes: Chemical Added To Traditional Cigarettes84
On the upside, this is supposed to reduce the amount of fires that are caused by unattended cigarettes.
The fire safe cigarette chemical, ethylene vinyl acetate has been added to all cigarettes in packs that have the FSC lettering on the side or bottom of the pack. Ethylene vinyl acetate is added in rings to the cigarette paper. When the smoker is not inhaling and the lit part of the cigarette gets to the chemical ring, it will self extinguish.
Sunday, June 14, 2009
OXYGEN BAG
biology testing instrument
Detailed Description
Technical feature:
Control by microcomputer.large screen liquild crystal display.frequency rotor(Human-Computer interaction).can realizing.Show menu for reading centrfugal integral and total time tec.programmadle operation with RCF automatic computing.ensure safety in using the instru-ment,it is installed with unbalanced unit,gate lid,overspeed and over-temperature protection device.
This machine adopt ABS strength engineering plastics once-forming.Shell and proved up to International standard.
Friday, June 12, 2009
Beaker, glass, 250 ml, Pyrex
Order Bomex beakers for comparable quality and durability at a lower price....
http://www.hometrainingtools.com/beaker-glass--250-ml-pyrex/p/CE-BEAK250/
Test Tubes, small 13x100 mm
Chemistry of Food Experiment Kit
The instructions include five experiments as well as ideas for students to try on their own. Comes with test tubes, a beaker, buiret reagent, benedict's solution, indophenol, iodine, and more. You provide household foods like crackers and juice - with your kitchen as the laboratory, test whatever you're curious about! Ages 13 & up.
$29.95
Item# KT-CHEMFD
CAS - Science Connections
"...While many will not recognize his name or the synthetic sheet polarizer he invented, most are familiar with the company founded by Land - the Polaroid Corporation - and the instant photography products he introduced in 1948. As the age of instant photography appears to be near its end,4 Land's summer camp-inspired invention of a synthetic sheet polarizer continues to live on, most notably as a popular glare-reducing feature in sunglass lenses.
Contributed byPeter S. Carlton, Ph.D.CAS Communications
Sunday, June 7, 2009
Yuantongda Technology Trade Co., Ltd.
1.Plant Source: Citrus Aurantium L.2.Specification: powder<80m,>200mAssay:: no less than 90%(90%~102%)xxxxx Formula:Botanical Source Citrus Aurantium L / hesperidinxxxxx C20H25N2O5Cl·C4H4O4M.W. 609 4.Physical properties: sallow or yellowish moisture-absorbing powder, indissoluble in water and alcoholxxxxx: Diosmin is a flavonoid that can be isolated from various plant sources or derived from the flavonoid hesperidin. Diosmin was first introduced used in medical treatment in 1969.Diosmin is useful in chronic venous insufficiency, hemorrohoids,lymphedema,and varicose veins.Diosmin also has anti-inflammatory,,antioxidant,and anti-cancer properties.6.Packing Detail: packing material: internal :double-two plastic bag. External: cardboard drum.Packing method: packed in drum(25kg/drum)7.Weight:G.W.:27~27.5KG/drumN.W.:25KG/drum8.Quality Standard: EP5xxxxx method: HPLC10.Storage: in an airtight container.
Guangwei Chemicals Imp.&Exp. Co., Ltd
Shijiazhuang Muen chemicals CO., LTD
Volant Group Ltd
Description,
Founded in 2003, Volant Fine Chemical Co., Ltd specializes in the production, custom synthesis and outsourcing of high quality specialty chemicals, located in Qiangjiang, Hubei.Occupying a total area of 15,000M2, Volant Fine Chemical owns fixed assets of USD 2 million. There are over 100 employees in our company, including 5 professional technicians in different fields. With the support of our own plant and many good relation partners, our products have been exported to many countries and areas in the world. Based on the good quality and excellent services, we have gained high popularity among our end-users all over the world.
Chemical Anchor
No bing about expansibility and allow smaller side pitch; Can provide sufficient drawing force even in wet anchor hole; It has very strong bearing capacity in non-split concrete body; Easy to install, quick to concrete, do not ninder the construction speed. Studs in carbon steel and yellow zine plated steel. Heavy duty fixing without radial influence of expansion forces can be used close to edges. Accurate drill depth is necessary.
Saturday, June 6, 2009
plant chemical dieseas
chemical spell kit
fire with safe
There are three types of fires listed on the above diagram; not all extinguishers can be used on each type of fires.
Type A fires are the ordinary combustible materials such as wood, paper, cloth, etc...
Type B fires are flammable liquid fires such as gasoline, paints and solvents, alcohols, acetone, etc..
Type C fires are electrical fires.
There is a fourth type of fire not listed on the above diagram - Type D fires are flammable solids. When labs have flammable solids, a special type of fire extinguisher is required. You must contact the Office of Environmental Health & Safety, Fire & Life Safety to advise that your lab has flammable solid so they can provide you with the appropriate extinguisher.
The type of fire will determine the type of extinguisher that can be used. In many university labs, Fire & Life Safety have supplied the multipurpose dry chemical extinguishers because they cover all three types of fires.
chemical transport
Thursday, June 4, 2009
Solvent dyes
Product Features:
Detailed Product Description
Product Characters:Good solubility with resin;Content:30%~35%;Stable,no excessive dyes in common condition;More environmental concern and safety ,free of 20 aromatic amine materials which is prohibited in Germany;High temperature melting point ,low toxic in solvent state;PH vallue:5-8(Pre-test before blending together);Degree of light resistance:6-8 more lower in green and blue.Application field:1)Wood lacquer:soluble in most solvent and resin , superior stability in Acid curing resin ,Amino ,Melamine and acrylic resin ,excellent in colour performance for wood lacquer;2)Leather decorating and coloring :gear to pretreatment or post-decorating of all classes of natural leather ,having the effect of flashing metal ,optimum weather resistance;3)Coloring of aluminum foil film and transferring printing : excellent colour performance such as brightness ,colored ,suitable for aluminum foil ,vacuum electroplating of PET.PVC.OPP and other transparent plastic film ,bronzing processing and transferring printing ,no need of other additives ,applied in different coating layers;4)Printing ink and package : offset and plate gravure printing ink , superior color performance with dye paste;
5)stationary ink: good solubility ,gear to all oily ink ;
6)Others : also be applied in coloring of shoe polish ,lubricating oil ,other grease and effervesce macromolecule.
Matting Agent SA-260
Product Features:
Detailed Product Description
Specifications: Matting Agent SA-260
Certification: ISO ISO9001,ROHS
Features:
1) Profile: white micro powder
a) Optimal flatting efficiency, precisely controlled process ensuring pore volume 1.8ml/g for consistent performanceb) Easy adding: in the production of the coatings, it can be easily added in any process
c) High film clarity: extremely high purity (99.3% SiO2 and above).It makes silica invisible in polymer films and clear lacquers.d) Optimal suspension: no hard sedimentation through long time reserving since it is treated by organice) Well dispersed: easily dispersed in any coatings, only require the common high sped stirs by approximate line-velocity1 5000r/min, and
stirring 15 – 20 minutes.
2) Applications:a) Advanced furniture coatingsb)coil coatingsc) Leather / Synthetic Leather
d) Thin film coating, such as synthetic and natural leather, decorative
materials3) Main technical data: a) SiO2 content: 99.3% min. b) Oil absorption (g/100g): 280-330 c) Average particle size: centrifugal measure: 2 micron d) Ignition loss: 4% e) PH value (5% aqueous suspension): 7 f) Surface treatment: no organic wax
g) whiteness:95.
Solvent dyes GN-20
Product Features:
Product Details:
Colour:green
Place of Origin:Hunan China
Model Number:GN-20
Payment & Shipping Terms:
Minimum Order Quantity: 4500 Kilogram 1*20 container
Packaging Details:
1.powder products----packaged in carton boxes(net weight:20kg/carton box,4bags in each carton box,5kg/bag)
2.Liquid products----packaged in polyethylene plastic pails(net weight:25kg/bag)
3.Liquid power products----1-5kg small packages according to custom
Delivery Time: 15~20days
Payment Terms: L/C,T/T
Supply Abiity: 300000 Kilogram per Month.
Tuesday, June 2, 2009
Oxygen Cryogenic Units
Technology:
Cryogenic:
Purity:
99,5% - 99,7% by vol. Special plants with an oxygen purity up to 99,99% by vol. on request
Capacity:
Standard units from 50 Nm³/h to 5000 Nm³/h Special units on request
Product pressure:
up to 300 bar g
Standard equipent:
- Air compressor - Air cooling unit - Air purification unit (molecular sieve battery) - Cold box with heat exchanger and rectification systems - epansion turbine
Supplementary equipment:
- Storage tanks for liquid oxygen - Storage vessels for gasus oxygen - Liquid oxygen pumps - Oxygen vaporizers - Oxygen pipeline distribution / filling compressors - Oxygen cylinder filling manifolds
Oxygen Membrane Units
Technology:
Membrane
Purity:
Up to 40%
Capacity:
Standard units up to 64 Nm3/h Special units on request
Primary air:
Compressors with refrigeration dryers and filters or compressed and cleaned air provided by the customer
Options:
Alert function, analyser units, operation-hour counter, booster for pressure up to 300 bar, touch-screen, SMS-message system, flow meter, special voltage design, skid mounted or mounted in a container for outdoor installation
Oxygen Water Units
Technology:
Cavitation
Enrichment level:
Up to 200 mg/L
Capacity:
Our smallest unit has a capacity of 10.000 L/h The capacity is not limited because our units are modular and can also be combined.
Options:
With the same unit you can also enrich the water with CO2. If you prefer oxygen water with CO2 it can be produced with the same unit without any changes. With this unit CO2 will be bound by almost 100%
General information: - Enriching the water up to 200 mg/l - Sterility above 120 mg/l - Mixing with CO2 possible - Connection with existing counter pressure filling units possible - Units from 10.000 L/h to 30.000 L/h - Combining of more than one unit for higher capacities - Oxygen
- Enriching the water up to 200 mg/l
- Sterility above 120 mg/l
- Mixing with CO2 possible
- Connection with existing counter pressure filling units possible
- Unit
Successful laboratory tests:
Blends of the most varied consistencies, such as for example, fruit juices, beer drink mixtures, oils (diesel, machine, salad and raw oils), silicone, graphite, wax and water mixtures as well as paints and pastes have been successfully combined and demonstrate the variety of possible applications of cavitative mixtures whose stability and shelf-life can be shown to be beyond the previous known mixture and preservability limits.