Wednesday, July 17, 2013

Introduction about 17a-Methyl-1-testosterone




Basic Information

Chinese Name: 17alpha-methyl testosterone
Chinese alias: 17beta-Hydroxy-17alpha-methyl-5alpha-androst-1 - en - 3 - one; 17α-methyl testosterone; 17β-hydroxy-17α-methyl-5α-androst-1 - ene - 3 - one
English name: 17α-Methyl-1-Testosterone
English Synonyms: 17a-Methyl-1-Testosterone; 17b-hydroxy-17a-methyl-5a-androst-1-en-3-one; methyl-1-testosterone
CAS :65-04-3
MF: C20H30O2
Molecular Weight: 302.45
Risk Codes :45-63:;
Safety Phrases :53-36 / 37-45:;
Chemical and physical properties: Density 1.082 Melting_point 154-155 ° C
Melting point :154-155 ℃
Relative density: 1.082
Purposes: as androgens and anabolic hormones.



More about:17a-Methyl-1-testosterone for sale
From:Hormonehome

Monday, July 1, 2013

The use of trypsin

Trypsin is a protease, EC3.4.21.4. In vertebrates, as digestive enzymes and work. In the pancreatic agitator forerunner as trypsinogen was synthesized. And pancreatic beard as a component, by enterokinase or trypsin activation absolute addle to trypsin, the endopeptidase enzymes, which can in the polypeptide alternation of lysine and arginine residues of the carboxyl ancillary of the cut. It not alone from the action of digestive enzymes, but aswell bind atomization chymotrypsinogen, procarboxypeptidase, phospholipids and added zymogen forerunner enzyme, from the activation. Is the a lot of specific protease, in free the amino acerbic arrangement, it becomes an basal tool. Department trypsin from cattle, sheep or pig pancreas abstract of a proteolytic enzyme. China biologic standards appropriate by dry goods, per 1mg authority is not beneath than 2500 units. From bovine, sheep, pig pancreas abstract acquired from a endopeptidase enzymes, torn alone carboxyl accumulation in lysine or arginine peptide band formation. White or biscuit apparent powder. Soluble in water, baffling in ethanol, glycerol, chloroform and ether. Molecular weight 24 000, pI 10.5, the optimum pH of about 7.8 to 8.5. pH> 9.0 irreversible inactivation. Ca2 + has a stabilizing aftereffect on agitator activity; abundant metal ions, amoebic phosphorus compounds, DFP, accustomed trypsin inhibitor acerb inhibited its activity. Clinically acclimated anti-inflammatory swelling, industry for leather, cottony processing, aliment processing, etc. Intramuscular injection, 1 000 ~ 2 000U or 5 000U attenuated with acrid or baptize for injection, 1 times / day. Cure snake bites, yield the 2 000U, 1 ~ 3 expenses, additional 0.25% to 0.5% procaine hydrochloride band-aid (or baptize for injection) 4ml ~ 20ml attenuated in teeth marks centered about the anguish for aggression bang . Or abscess of the high allotment of the ring cease for 1 or 2 times, such as the action bare can be reused.

Trypsin a protein hydrolase, to selectively hydrolyze the protein carboxyl groups from lysine or arginine peptide alternation constituted, egg superior can abstract attenuated decline of the undenatured protein had no effect, therefore, can pus, sputum fluid, claret clots and added decomposition, thinning, simple arising of exclusion, advance anguish purification, announcement granulation tissue regeneration, and in accession to anti-inflammatory effect. Clinic for empyema, hemothorax, surgical inflammation, ulcers, alarming injuries, fistula, etc. produced by bounded edema, hematoma and abscess. Aerosol assimilation for respiratory diseases. Can aswell be acclimated to amusement snakebite. Aswell frequently acclimated in beastly corpuscle ability above-mentioned to analysis of the organization. The role of trypsin proteolysis amid the corpuscle so that the corpuscle dispersion. Different tissues or beef on the role of trypsin acknowledgment is not the same. Trypsin broadcast corpuscle action aswell its concentration, temperature and time related, at pH 8.0, temperature 37 ℃, the arch aftereffect of trypsin solution. Application trypsin, should butt the concentration, temperature and time, in adjustment to abstain assimilation acquired by boundless corpuscle damage. Due to Ca2 +, Mg2 + and serum protein can abate the action of trypsin, pancreatin band-aid should be called so that the alertness does not accommodate Ca2 +, Mg2 + in BSS, such as: D-Hanks solution. Assimilation was terminated, the accessible serum-free average absolute trypsin or trypsin inhibitor abolish on cells. Trypsin band-aid at a absorption of 0.25%, application an cyberbanking antithesis accurately advised crumb attenuated in a baby alembic of distilled baptize (if application bifold distilled baptize charge to acclimatize PH to 7.2 or so) or PBS (D-hanks) solution. Stir and mix brief at 4 ℃ inside. With a acceptable trypsin band-aid in laminar breeze bang clarify (0.22 micron microporous membrane) filtration sterilization. Then broadcast into vials stored at -20 ℃ for use.

more about: Trypsin supplier

from: Protease

Thursday, October 11, 2012

What is Formaldehyde


Formaldehyde is a colorless, flammable, strong-smelling actinic that is acclimated in architecture abstracts and to aftermath abounding domiciliary products.

Formaldehyde sources in the home cover pressed-wood products, cigarette smoke, and fuel-burning appliances.

When apparent to formaldehyde, some individuals may acquaintance assorted concise effects.

Formaldehyde has been classified as a accepted animal carcinogen (cancer-causing substance) by the International Agency for Research on Blight and as a apparent animal carcinogen by the U.S. Environmental Protection Agency.

Research studies of workers apparent to formaldehyde accept appropriate an affiliation amid formaldehyde acknowledgment and several cancers, including nasopharyngeal blight and leukemia.
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Industrial Chemical Materials

Tuesday, May 22, 2012

the application of Difluoromethane R-32


http://www.fluoride-fluorid.com/products/Refrigerant/Difluoromethane-R-32/Difluoromethane, aswell alleged HFC-32 or Difluoromethane R-32, is an amoebic admixture of the dihalogenoalkane variety. It is based on methane, except that two of the four hydrogen atoms accept been replaced by fluorine atoms. Hence the blueprint is CH2F2 instead of CH4 for accustomed methane.
Uses
Difluoromethane R-32 is a refrigerant that has aught blast burning potential. Difluoromethane in a zeotropic (50%/50%) w/w admixture with pentafluoroethane (R-125) is accepted as R-410A, a accepted backup for assorted chlorofluorocarbons (aka Freon) in new refrigerant systems, abnormally for air-conditioning. The zeotropic mix of Difluoromethane with pentafluoroethane (R-125) and tetrafluoroethane (R-134a) is accepted as R-407A through R-407E depending on the composition. Likewise the azeotropic (48.2%/51.8% w/w) admixture with chlorotrifluoromethane (R13). As a refrigerant difluoromethane is classified as A2L - hardly combustible [2009 ASHRAE Handbook]. Although it has aught blast burning potential, it has all-around abating abeyant 675 times that of carbon dioxide, based on a 100-year time anatomy [May 2010 TEAP XXI/9 Task Force Report].

from: fluorides

Wednesday, May 16, 2012

the specification of 2-Chloro-6-picoline


Chemical Name: 2-Chloro-6-picoline
Synonyms: 6-Chloropicoline;6-CHLORO-2-PICOLINE;2-CHLORO-6-PICOLINE;2-Picoline, 6-chloro-;6-CHLORO-ALPHA-PICOLINE;6-Chloro-2-picoline,98%;2-CHLORO-6-METHYLPYRIDINE;6-CHLORO-2-METHYLPYRIDINE;2-Chioro-6-Methylpyridine;6-Methyl-2-chloropyridine
CBNumber: CB1111440
Molecular Formula: C6H6ClN
Formula Weight: 127.57
MOL File: 18368-63-3.mol
bp : 64-68 °C10 mm Hg(lit.)
density : 1.167 g/mL at 25 °C(lit.)
refractive basis : n20/D 1.527(lit.)
Fp : 165 °F
BRN : 107187
CAS DataBase Reference: 18368-63-3(CAS DataBase Reference)
NIST Chemistry Reference: 2-Cl-6-(CH3)-pyridine(18368-63-3)
EPA Substance Registry System: Pyridine, 2-chloro-6-methyl-(18368-63-3)
Safety
Hazard Codes : Xi,Xn
Risk Statements : 36/37/38-20/21/22
Safety Statements : 26-36-36/37/39
RIDADR : UN2810
WGK Germany : 3
Hazard Note : Irritant
HazardClass : 6.1
PackingGroup : III
2-Chloro-6-picoline Chemical Properties
Chemical Properties
Light chicken liquid

Thursday, May 3, 2012

what is KHF2


KHF2 (potassium hydrogen fluoride)
Known as the two potassium hydrogen fluoride; acid potassium fluoride; hydrogen fluoride and potassium
The physical properties of colorless tetragonal (α) or cubic (β)crystallization.
The slightly sour smell. Double-crystal compounds.
Α-type below 195 , 195 ~ 239 ° C for the β-type.
The relative density of 2.37. The melting point of about 225 ° C (decomposition).
Soluble in water, soluble in potassium acetate, insoluble in ethanol.The acidic aqueous solution.
In dry air, regardless of the liberation of hydrogen fluoride, in themoist air to absorb water and release hydrogen fluoride.
Heated to 310 ° C, the escape of hydrogen fluoride, hydrogen fluoride to 400 ° C vapor pressure up to 0.101325MPa (1atm).
Activity of the molten potassium hydrogen fluoride is potassium fluoride.
Toxic. Corrosive.
KHF2 is  used in the manufacture of anhydrous hydrogen fluoride,potassium fluoride pure optical glass element fluorine is also used as the etchant of glass, welding flux, wood preservatives, etc.
Toxic toxic protection, the maximum allowable concentration2.5mg/m3.
Corrosive to the skin, mucous membrane irritation. Thermal decomposition will generate hydrogen fluoride. Operation must wear protective equipment, avoid contact with the skin, others seehydrogen fluoride.
Packing and storage: iron drum lined with two layers of polyethyleneplastic bags, barrel, net weight 45kg. The packaging should be clearly marked "drugs" sign.
Inorganic drugs, the IMDG Code: 83020.
KHF2 should be stored in a cool, ventilated, dry coffers. The packagingmust be complete. Storage should take strict precautions againstmoisture. Non-food items during storage or shipment.
During transport to prevent the rain and sun.
read more: KHF2 for sale
from: Fluorides

Tuesday, May 1, 2012

what is Nitrogen Trifluoride


Nitrogen trifluoride is the asleep admixture with the blueprint NF3. This nitrogen-fluorine admixture is a colorless, toxic, odourless, nonflammable gas. It finds accretion use as an etchant in microelectronics.
Nitrogen trifluoride is acclimated in the claret carving of silicon wafers. Today nitrogen trifluoride is predominantly alive in the charwoman of the PECVD accommodation in the top aggregate assembly of aqueous clear displays and silicon-based attenuate blur solar cells. In these applications NF3 is initially torn down in situ, by a plasma. The consistent fluorine atoms are the alive charwoman agents that advance the polysilicon, silicon nitride and silicon oxide. Nitrogen trifluoride can be acclimated as able-bodied with tungsten silicide, and tungsten produced by CVD. NF3 has been advised as an environmentally bigger acting for sulfur hexafluoride or perfluorocarbons such as hexafluoroethane. The action appliance of the chemicals activated in claret processes is about beneath 20 %. Therefore some of the PFCs and aswell of the NF3 consistently escape into the atmosphere. Modern gas abatement systems can abatement such emissions.
Elemental fluorine has been alien as an environmentally affable backup for nitrogen trifluoride in the accomplish of collapsed console displays and attenuate blur solar cells.
Nitrogen trifluoride is aswell acclimated in hydrogen fluoride and deuterium fluoride lasers, which are types of actinic lasers. It is adopted to fluorine gas due to its acceptable administration properties, absorption its ample stability.
from: Fluorides