Polysaccharides. As part of the protein molecule does not occur

Sera - part of some amino acids (cysteine, methionine), vitamin B1 and some enzymes. Potassium - contains in cells in the form of + ions, activates the vital activity of the cell, activates the operation of enzymes, affects the rhythm of cardiac activity. The iron is part of hemoglobin and many enzymes, participates in breathing, photosynthesis. Iodine - is part of the hormones of the thyroid gland, participates in the regulation of metabolism. Chlorine - participates in water-salt metabolism, in the transmission of the nerve impulse, in the composition of hydrochloric acid of the gastric juice activates the enzyme of pepsin.

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Chemical composition of cells

"Chemicals cells" are inorganic substances. Water functions. Transportation substances. The ratio of chemical compounds in the cell. Cations (+ ions). Macroelements. Contained in the bodies of inanimate and wildlife. Participates in chemical reactions. Water and salt. Hydrophilic is well soluble in water. Protection of the body from overheating and supercooling.

"The structure of the cell and its functions" - the functions of mitochondria. Mitochondria. Functions: Provides protein biosynthesis (assembly of protein molecule from amino acids). Cilia (numerous cytoplasmic grows on the membrane). Cytology (from cyto ... and ... logic) - the science of the cell. Cell theory. gene (DNA section). Golgi apparatus. Flagics (single cytoplasmic grows on the membrane).

"Cell core" - endoplasmic reticulum folded. Eukaryotic cell. DNA. 0.25 microns. Features of the structure. Mitochondria. Plasmids are small ring DNA in the cytoplasm. Vacuoles. Unicellular (bacteria, simplest). Nucleus. Outer shell. Flagellum. 0.1 μm. DNA mitochondria, chloroplasts. The core functions in the prokaryotic cell perform the Golgi apparatus.

"Organic cells of cells" are organic substances included in the cell. Output. RNA: and-RNA, T-RNA, P-RNA. Carbohydrates consist of carbon atoms and water molecules. What are the functions of carbohydrates and lipids? Plan. Make a conclusion. Vegetable and animal proteins. List the proteins function. Fastening. Organic cell compounds: proteins, fats, carbohydrates.

"The structure of the plant cell" is the objectives and objectives of the lesson. Burning cells. The result is known to everyone who dealt with nettle. The cork cells are dead and saturated with substances that do not drive water and air. Root hairs. Homework. The microscope was set, the drug was on the table, the lens was sent, look, and onions - from Polek! Vacuoles. L.R.№2 "Plasts in the cells of the Elode sheet".

"Biology Cell Building" - educational items: biology, physics Project participants: Grade 10 students. OPV: Why don't we understand the cage? Find out the transport mechanisms of substances through the cell membrane. Cell membrane. The topic of the educational project: the structural organization of the cell. Web site. Didactic materials. Transport substances in a cage.

Total in the subject of 15 presentations

Oligosaccharida

Monosaccharides

  • glucose
  • fructose
  • galactose
  • mannose
  • Disaccharides
    • sakharoza (ordinary sugar)
    • maltose
    • isomaltosis
    • lactose
    • lactulose
  • dextrin
  • glycogen
  • starch
  • cellulose

Proteins - The main "workers" cells are natural biopolymers built from residues 20 amino acids. The macromolecule proteins can be part of several tens to hundreds of thousands and even millions of amino acid residues, and the protein properties are significantly dependent on the order in which these residues are located for each other. For this reason, it is obvious that the number of possible proteins is practically unlimited.

Amino acids Call organic compounds in which the carboxyl (acid) group of the Soon and the amino group NH 2. Attached to the same carbon atom.

Fig.1 Structural formula amino acids

The structure of such a molecule is described by the structural formula (Fig. 1), where R is a radical, different for different amino acids. Τᴀᴋᴎᴍ ᴏϭᴩᴀᴈᴏᴍ, the composition of amino acids include four organogen C, O, N, N, and some radicals can be included in S.

According to the ability of a person to synthesize amino acids from their predecessors, they are divided into two groups:

  • Indispensable: tryptophan, phenylalanine, lysine, threonine, methionine, leucine, isoleucine, Valin, Arginine, Gistidin;
  • Replaceable: tyrosine, cysteine, glycine, alanine, serine, glutamy acid glutamine, asparagic acid, asparagin, proline

An indispensable amino acids should flow into the human body with food, as they are not synthesized by a person, although some replaceable amino acids are synthesized in the human body in insufficient quantities and should also come with food.

Chemical formulas 20 standard amino acids:

The structure of a protein molecule supported by covalent bonds between amino acid residues is called primary.In other words, the primary structure of the protein is determined by the simple sequence of amino acid residues. These remnants can be quite defined in space, forming secondarystructure. The most characteristic secondary structure is the α-helix when the amino acid chains seem to form the screw threads. One of the most amazing properties of the macromolecule is that the α-spirals with the left and right "threads" are in nature with a substantially different probability: macromolecules, "swirling" to the right, almost no.The asymmetry of biological substances relative to the mirror reflection found in 1848 ᴦ. Great French scientist L. Paster. Subsequently, it turned out that this asymmetry is inherent in not only macromolecules (proteins, nucleic acids), but also organisms in general. As the preferential spirality of the macromolecules arose and how she further fixed in the course of biological evolution - these questions are still discussion and have no one-time response.

The most complex and delicate features of the structure that distinguish one protein from the other are associated with a spatial organization of a protein called tertiarystructure. In fact, it is about the fact that the spiral chains of amino acid residues are minimized into something resembling a ball of thread; As a result, rather long chains occupy a relatively small volume in space. The collapse character in the ball is not accidental. On the contrary, it is definitely determined for each protein. It is due to the tertiary structure of a protein that is capable of performing its unique catalytic, enzymatic functions, when, as a result of the fastened capturing of the reagents, their synthesis is carried out in complex chemical comparable, comparable in difficulties with the protein itself. None of the chemical reactions carried by proteins cannot occur in the usual way.

In addition to the tertiary structure, the protein may have quaternarystructure; When there is a structural connection between two or several proteins. In fact, it is about combining several "clubs" from polypeptide chains.

Nucleic acids (from lat. nucleus. - core) - high molecular weight organic phosphorus-containing combined, biopolymers. Polymer forms of nucleic acids call polynucleotides. The chains from nucleotides are connected through the residue of phosphoric acid (phosphodieter communication). Since in nucleotides there are only two types of heterocyclic molecules, ribosis and deoxyribosis, then there are only two types of nucleic acids - deoxyribonucleic ( DNA) and ribonuclear ( RNA). DNA and RNA nucleic acids are present in the cells of all living organisms and perform the most important functions for storing, transferring and implementing hereditary information. One of the basic axes of biology claims that hereditary information on the structure and functions of the biological object is transmitted from generation to generation by the matrix path, and the carriers of this information are nucleic acids.

These biopolymers are easier at first glance than proteins. The "alphabet" of nucleic acids consists of two of the four "letters", in the role of which nucleotides are speaking - sugar-pentoses, to which one of five nitrogenous grounds are attached: guanine (g), adenine (a), cytosine (C) , Timin (t) and uracil (y).

Adenin Guanian Timin Cytozin

Fig.2 of the foundations of the bases most common in the DNA

In ribonucleic acid (RNA), sugar is a ribosis carbohydrate (C 5 H 10 O 5), and in deoxyribonucleic acid (DNA) - carbohydrate deoxyribosis (C 5 H 10 O 4), which differs from ribose only by the fact that about one of the atoms Carbon The group is replaced by a hydrogen atom. Three of these nitrogen bases - G, A and C - are included in the composition and RNA, and DNA. The fourth nitrogenous base in these acids is different - t applies only to DNA, and only in RNA. The links of nucleotides with phosphodieter bonds of phosphoric acid residue H 3 PO 4 are associated. Relative molecular weights of nucleic acids reach the values \u200b\u200bof 1500,000-2,000,000 or more. The secondary structure of DNA was established by X-ray analysis methods in 1953 ᴦ. R. Franklin, M. Wilkins, J. Watson and F. Scream. It turned out that the DNA form spirally twisted threads, and the nitrogen base of one DNA filament is associated with hydrogen bonds with a determined base of another thread: adenine can only be associated with thimine, and cytosin is only with guanin (Fig. 3). Such connections are called complementary(Additional). Hence it follows that the order of the base in one thread uniquely determines the order in another thread. It is with this that the most important DNA property is connected - the ability to self-reproduction (replication). RNA has no double spiral structure and is built as one of the DNA threads. There are ribosomal (RRNA), matrix (mRNA) and transport (TRNA). ʜᴎʜᴎ are distinguished by those roles that play cells.

Fig. 3 Different DNA DNA Spirals

What do nucleotide sequences in nucleic acids mean? Every three nucleotides (they are called triplet or codons)encode a particular amino acid in protein. For example, the UCG sequence gives a signal to the synthesis of amino acid serine. Immediately the question arises: how many different triples can be obtained from four "letters"? It is easy to figure out that such triples can be 4 3 \u003d 64. But in the formation of proteins, 20 amino acid residues can participate, it means some of them can be encoded by different three, which is observed in nature. For example, leucine, serine, arginine is encoded with six top three, proline, valine and glycine - four, etc. This property of a triplet genetic code is customary degenerate or redundancy.It should also be noted that for all living organisms, protein coding occurs equally (coding versatility). At the same time, the sequences of nucleotides in DNA are not read differently, as the only way (Non-induction of codons).


  • - Polysaccharides

    Xylose (wood sugar) is contained in a cotton husk, corn noras. Xylose is part of Penosanov. Connecting with phosphorus, xylose proceeds to active compounds that play an important role in the mutual adventures of sugars. Arabinose is contained in coniferous ... [Read more]


  • - raw material base of plants containing polysaccharides

    The patterns of formation and accumulation of polysaccharides in plants. The role in the life of polysaccharides plants is 80% of the organic matter of the planet, since they make up most of the dry matter of the plants. In the plants of monosaccharides and their derivatives, ... [Read more]


  • - Reserve polysaccharides

    The main reserve polysaccharide in plant cells is starch. Starch is formed in plants with photosynthesis and postponed in the form of a "reserve" carbohydrate in roots, tubers and seeds. For example, rice grains, wheat, rye and other cereals contain 60-80% starch, ...

  • What amino acid aromatic

    B) Asparagic acid

    C) cysteine

    D) tryptophan +

    E) GISTIDIN

    109. What amino acid heterocyclic:

    A) GISTIDIN +

    What amino acid is manifested

    B) Asparagic acid

    D) phenylalanine

    111. Specify the dustyrion of amino acids:

    B)

    C)

    D) +

    E)

    112. What is the peptide connection:

    A)

    113. Amino acid, in the molecule of which there is no asymmetric carbon atom:

    A) Tyrosine

    C) glycine +

    D) phenylalanine

    In the composition of which amino acid is sulfur

    A) Arginine

    B) tryptophan

    C) GISTIDIN

    D) cysteine \u200b\u200b+

    115. Amino acid, in which there is no free amino group in the molecule:

    A) Proline +

    B) cysteine

    C) glutamic acid

    D) tryptophan

    E) phenylalanine

    116. If the pH of the amino acid solution is equal to the value of the isoelectric point, then:

    A) Amino acid molecule charged negatively

    B) amino acid molecule charged positively

    C) Amino acid molecule neutral +

    D) amino acid soluble in water

    E) amino acid molecule easily collapsed

    117. If the pH of the amino acid solution is equal to the value of the isoelectric point, then:

    A) Amino acid molecule in the form of bipolar ion +

    B) anion amino acid molecule

    C) molecule amino acids in the form of cation

    D) amino acid molecule is not charged

    E) amino acid molecule collapses

    118. In the composition of the protein molecule does not occur:

    A) Creatine phosphate +

    B) glutamine

    D) Gistidin

    E) tyrosine

    119. glycine \u003d 2.4, RK2 glycine \u003d 9.7, the isoelectric point of glycine is equal to:

    120. The protein molecule includes:

    A) carboxylic acid

    B) D--amino acids

    C) D--amino acids

    D) l--amino acids

    E) L--amino acids +

    121. Amino acid, which does not occur in the composition of the protein molecule:

    A) tryptophan

    B) Asparagic acid

    D) Ornithine +

    E) GISTIDIN

    122. It does not apply to replacement amino acids:

    C) glutamic acid

    D) tryptophan +

    123. Not applicable to indispensable amino acids:

    B) phenylalanine

    D) proline +

    E) threonine

    124. Replaced amino acids include:

    B) Isoleucine

    C) Asparagic acid +

    D) methionine

    E) tryptophan

    125. An indispensable amino acids include:

    B) glutamic acid

    D) Asparagin

    E) cysteine

    126. Ningidrin reaction - high-quality response to:

    A) free amino groups +

    B) free carboxyl groups

    C) to determine hydroxyl groups

    D) to define sh-groups

    E) to determine aromatic amino acids

    127. To determine the protein in the solution, use:

    A) Selivanov Reaction

    B) Biuret reaction +

    C) Sakaguchi Reaction

    D) nitroprusside reaction

    E) Millon Reaction

    128. Millon Reaction is used: to determine:

    A) tyrosine residues in the protein molecule +

    B) Guanidine Arginine Group

    C) hytidine imidazole group

    D) aromatic amino acids

    E) cysteine \u200b\u200bSH

    129. What amino acid dicarboat:

    A) Tyrosine

    B) glutamic acid +

    D) tryptophan

    130. As part of the hemoglobin molecule:

    A) 1 subunit

    B) 3 subunits

    C) 6 subunits

    D) 4 subunits +

    E) 2 subunits

    131. How many subunits in the albumin molecule are:

    132. If the pH of the protein solution is higher than the value of the isoelectric point of the protein molecule, then:

    A) protein molecule charged negative +

    B) protein molecule charged positively

    C) protein molecule is uncharged

    D) protein molecule denaturized

    E) insoluble protein

    133. Not applicable to globular proteins:

    A) Tripsin

    B) hemoglobin

    C) keratin +

    D) albumin

    E) Mioglobin

    134. It does not apply to fibrillar proteins:

    A) Collagen

    B) insulin +

    C) keratin

    E) Elastin

    135. Glycoprotein includes:

    A) Phosphants

    B) Carbohydrates +

    E) Metal ions

    136. Protein molecule in isoelectric point:

    A) charged negative

    B) charged positively

    C) Common charge is zero +

    D) denaturized

    E) soluble in solution

    137. For enzymatic activation, amino acids are required:

    138. The composition of hemoglobin includes:

    A) Marganese

    B) Molybdenum

    E) Iron +

    139. The Prosthetic group of Mioglobin is:

    B) Molybdenum

    C) magnesium ions

    D) copper ions

    E) thiaminepyrophosphate

    140. In the formation of the tertiary structure of the protein molecule, communications are involved:

    A) covalent bonds

    B) hydrogen bonds

    C) hydrophobic interactions

    D) ion interactions

    E) all of the indicated links +

    141. The protein that has a quaternary structure:

    A) hemoglobin +

    B) Ribonuclease.

    C) Albumin

    D) Mioglobin

    E) Insulin

    142. Molecular oxygen carrier in the body:

    A) Amilaza

    B) Albumin

    C) hemoglobin +

    E) Collagen

    143. The composition of phosphoproproteins includes:

    B) phosphates +

    C) Carbohydrates

    E) Metal ions

    144. The protective function in the body is performed:

    A) immunoglobulins +

    B) Albumin

    C) Histons

    D) phosphatase

    145. The function that proteins are performed in the body:

    A) Transport

    B) Protective

    C) Regulatory

    D) structural

    E) all specified functions +

    146. Lipoprotein is a protein containing in its composition:

    B) Metal ions

    C) Carbohydrates

    D) lipids +

    E) phosphates

    147. Nucleoproteins are:

    A) complex proteins that include lipids

    B) Nucleic acid complexes with proteins +

    C) complex proteins that include carbohydrates

    D) complex proteins that include phosphates

    E) complex proteins that include metal ions

    148. For pepsin activity:

    A) the pH of the medium should be equal to pH 1.5-3.0 +

    B) Wednesday must be neutral

    C) Wednesday must be alkaline

    D) Metal ions should be present in the environment

    E) There must be free amino acids in the environment

    149. Blood protein, binding fatty acids:

    A) hemoglobin

    B) albumin +

    C) Orosemicoid

    D) Gaptoglobin

    E) Immunoglobulin

    150. In the process of reaminting, amino acids are formed:

    A) -Basic acids +

    B) Aldehydes

    D) unsaturated hydrocarbons

    E) Oxycycles

    151. The buffer properties of amino acids are due to:

    A) the presence of a carboxyl group

    B) the presence of an amino group

    C) good solubility

    D) the character of the radical

    E) the presence in the molecule at the same time carboxyl and amino groups +

    152. Tyrosine is formed in the liver from:

    A) tryptophana

    B) phenylalanine +

    D) histidine

    E) Arginine

    153. Amino acids are used in the body:

    A) for protein synthesis

    B) for hormone synthesis

    C) for formations

    D) as a source of nitrogen for the synthesis of nitrogenous compounds of non-synthesis

    E) in all indicated cases +

    154. In the urea cycle, it is formed:

    B) Isoleucine

    C) GISTIDIN

    D) arginine +

    E) tryptophan

    155. In the body enzymes:

    A) catalyze the speed of the chemical reaction +

    B) perform a structural function

    C) Spare Fund of Chemical Energy for Anabolic Reactions

    D) perform a protective function

    E) regulate osmotic pressure

    156. Redox reactions catalyze:

    A) oxidoreductase +

    C) Hydrolase

    D) Transferase

    157. Enzymes catalyzing the transfer of atoms and atomic groups:

    B) transferase +

    C) oxidoreduktase

    D) hydrolase

    158. Enzymes catalyzing hydrolysis of chemical ties:

    A) oxidoreductase

    B) Transferase

    D) hydrolase +

    159. Enzymes, catalyzing isomerization reactions:

    A) oxidoreductase

    B) Transferase

    C) isomerase +

    D) hydrolase

    160. Enzymes catalyzing new communication education reactions:

    A) Ligases +

    B) hydrolase

    C) Transferase

    D) Isomerase

    E) oxidoreduktase

    161. Enzymes, catalyzing reactions of nonregrolitic splitting and dual communication formation:

    A) Hydrolase

    B) Transferase

    C) Isomerase

    D) oxidoreduktase

    162. The class of hydrolazes belongs:

    A) Esterase

    B) Proteinase

    C) glycosidase

    E) all of the specified enzyme classes +

    163. Oxidoreduktases do not include:

    A) lactate dehydrogenase

    B) AlcoholDehydrogenase

    C) Peroxidase

    D) cytochromoxidase

    E) Ribonuclease +

    164. Apochanim is:

    A) Prostum group

    B) protein associated with a prosthetic group +

    C) the protein part of the enzyme, the active form of which contains a coenzyme

    D) organic enzyme cofactors

    E) simple protein

    165. Nicotinamedadenindinucleotide - a coenzyme that transfers:

    A) Metyl groups

    B) alkyl groups

    C) acyl groups

    D) amine groups

    E) hydrogen atoms +

    166. It does not apply to the coecments:

    A) Flavinmonucleotide

    B) pyridoxalphosphate

    C) thyroxin +

    D) nicotinamidadenindinucleotide

    E) thiaminepyrophosphate

    167. The coenzyme that carries the acyl groups:

    A) nicotinamidadenindinucleotide

    B) pyridoxalphosphate

    C) Flavinmonucleotide

    D) coenzyme a +

    E) folic acid

    168. It does not apply to the properties of enzymes:

    A) does not reduce the energy of the activation of chemical reactions +

    B) action efficiency

    C) high specificity in relation to the substrate

    D) reduces chemical reaction activation energy

    E) specificity of the action relative to the type of chemical reaction

    169. Hydrolysis of esters catalyzed:

    A) Esterase +

    B) glycosidase

    C) Hydrolase

    D) proteinase

    E) synthetases

    170. The coenzymes include:

    A) Tetrahydrofolytic acid

    B) thiaminepirophosphate

    C) Flavyenyenindinucleotide

    D) Liipoamid.

    E) all specified compounds +

    171. Does not apply to proteolytic enzymes:

    A) Tripsin

    B) lipase +

    D) Elastasa

    E) chymotrypsin

    172. Proteolytic enzymes catalyze:

    A) hydrolysis of peptide communication +

    B) hydrolysis of glycoside

    C) hydrolysis of ester communication

    D) phosphoether hydrolysis

    E) Simple Ether Communication Hydrolysis

    173. Enzymes are:

    A) biological catalysts accelerating chemical reactions +

    B) Main Building Material of Cell Membranes

    C) substances providing the detoxification of the body

    D) Chemical Reaction Inhibitors

    E) Substances participating in the transmission of signaling information

    174. Competitive inhibitors:

    A) associated with substrates

    B) associated with the active center of the enzyme +

    C) do not bind to the enzyme-substrate complex

    D) do not bind to the active center of the enzyme, are associated with another segment of the enzyme

    E) associated with the alto-solid center of the enzyme irreversibly

    175. Non-competitive inhibitors:

    A) like its structure substrate

    B) differ in their structure from the substrate +

    C) associated with the active center of the enzyme

    D) denaturing enzyme

    E) associated with the substrate

    176. Protein enzyme Pepsin:

    A) functions in gastric juice at pH 1.5-3.0 +

    B) operates in gastric juice at pH 9.0-11.0

    C) is included in the intestinal mucosa

    D) functions in a small intestine

    E) Provides hydrolysis of triacylglycerides in adipose tissue

    177. Tripsin is synthesized as a predecessor in:

    B) pancreas +

    C) fine intestines

    D) adipose tissue

    E) Gastric mucosa

    178. The activity of enzymes is associated with:

    A) Wednesday temperature

    B) pH environment

    C) presence in the environment of various chemical compounds

    D) substrate nature

    E) with all the specified conditions +

    179. Enzymes accelerate the flow of chemical reactions, as:

    A) reduce the activation energy of the chemical reaction +

    B) increase the activation energy of the reaction

    C) reduce the concentration of the reaction product

    D) change the structure of the substrate

    E) change the concentration of starting materials

    180. The nucleotide does not include:

    A) the residue of phosphoric acid

    B) pyrimidine bases

    C) Purine doping

    D) deoxyribosis

    E) glucose +

    181. The composition of ribonucleosides includes:

    B) nitrogenous base and rombing +

    E) the residue of phosphoric acid and rombosis

    182. The DNA does not include:

    B) Uracil +

    E) cytosin

    183. The RNA includes:

    A) 2-D-deoxyribofyranosis

    B) Glucopian

    C) d-ribofuranosis +

    D) fruitfuranoza

    E) Arabinose

    184. Nucleotide is:

    A) adenosine

    C) adenilic acid +

    E) cytosin

    185. The composition of deoxyribonucleotides includes:

    A) the residue of phosphoric acid and a nitrogen base

    B) nitrogenous base and rombosis

    C) nitrogenous base and deoxyribosis

    D) the residue of phosphoric acid and deoxyribosis

    E) the residue of phosphoric acid, deoxyribosis and a nitrogen base +

    186. A nitrogen base that is not included in RNA:

    E) cytosin

    187. The DNA contains:

    A) Galactopianosa

    B) Glucopian

    C) d-ribofuranosis

    D) fruitfuranoza

    E) 2-D-deoxyribofyranosis +

    188. Nucleoside is not:

    A) Guanozin

    B) Riboso-5-phosphate +

    C) adenosine

    E) citidine

    189. Monomeric units of nucleic acids are:

    A) nucleotides +

    B) nitrogenous bases

    C) amino acids

    D) Ribosophosphate

    E) monosaccharides

    190. In nucleic acid molecules, nucleotides are associated:

    A) disulfide bonds

    Sulfur - element VI of a group of periodic system with atomic number 16. The sulfur is relatively resistant in a free state, under normal conditions is in the form of an S8 molecule having a cyclic structure. The natural sulfur consists of a mixture of four stable isotopes with AT. m. 32, 33, 34 and 36. In the formation of chemical bonds of sulfur, all six electrons of the external electron shell may use (sulfur degrees: 0, 2, 4 and 6).

    The sulfur is a crystalline (in the form of a dense mass) or amorphous shape (fine powder). According to its chemical properties, sulfur is a typical metalloid and combined with many metals.

    In nature, sulfur occurs both in native state and in the composition of sulfur and sulfur minerals (gypsum, sulfur coledan, Glauberova salt, lead shine, etc.).

    The Russian name of the element comes from the ancient Indian (Sanskrit) the words "Sira" - light yellow. Prefix "Tio", often applied to sulfur compounds, is derived from the Greek name of the sulfur - "Teion" (Divine, Heavenly), since sulfur has long been a flammability symbol; The fire was considered the property of gods while Prometheus, as the myth says, did not bring him to people.

    Seres is famous for humanity from ancient times. Meeting in nature in a free state, she paid attention to the characteristic yellow color, as well as the sharp smell that her burning was accompanied. It was also believed that the smell and blue flame propagating burning gray, distinguishes demons.

    Sulfurous anhydride - suffocating gas formed when burning sulfur, in antiquity used for whitening tissues. When excavations, Pompeii found a picture on which the baking sheet with a gray and a device for hanging the matter above it. Frequently used sulfur and its compounds for the preparation of cosmetics and for the treatment of skin diseases. And for a long time it began to use it for military purposes. So, in 670, Constantinople defenders burned the Arabic fleet with the help of "Greek fire". It was a mixture of nitrate, coal and sulfur. The same substances were part of the black powder, used in Europe in the Middle Ages and until the end of the XIX century.

    In hydrogen and oxygen compounds, sulfur is in the composition of various anions, forms many acids and salts. Most sulfur-containing salts are smallly soluble in water.

    Sulfur forms oxygen oxides, the most important of which are sulfur and sulfuric anhydrides. Being in one group with oxygen, sulfur has similar redox properties. With sulfur hydrogen forms gas-soluble gas - hydrogen sulfide. This gas is very toxic, due to its ability to firmly bind to copper cations in the enzymes of the respiratory chain.

    Sulfuric acid, one of the most important sulfur compounds was opened, apparently, to the X B, starting from the XVIII century, it is produced on an industrial scale and soon it becomes an essential chemical product, necessary in metallurgy, and in the textile industry, and in other, various industries. In this regard, even more intensive searches of the sulfur deposits began, studying the chemical properties of the sulfur and its compounds and the improvement of methods for extracting them from natural raw materials.