bromothymol blue color change

An intermediate of the deprotonation mechanism is responsible for the greenish color in neutral solution.[2]. (b) If we titrate an acidic solution with NaOH, calculate the approximate pH at which the indicator color change first becomes visible. It is mostly used in applications that require measuring substances that would have a relatively neutral pH (near 7). The test may be false-positive in the presence of other alkaline substances such as blood or semen, or in the presence of bacterial vaginosis. As vaginal pH normally is acidic, the blue color indicates the presence of … 38-1) and cryptococcal antigen testing. 7.1) that is used as a biological slide vital stain to define cell walls or nuclei under the microscope. Using bromothymol blue you wouldn't be able to distinquish between an acid with pH 4 from an acid with pH 5. However, when it reacts with acidic solution then it turns into yellow color and blue color after reacting with alkaline solution. The bromothymol blue solution in the dry pinto beans and dry kidney beans beakers changed from blue to a final bluish green … [6][7] A common demonstration of BTB's pH indicator properties involves exhaling through a tube into a neutral solution of BTB. Bromothymol blue has been used in conjunction with phenol red to monitor the fungal asparaginase enzyme activity with phenol red turning pink and bromothymol blue turning blue indicating an increase in pH and therefore enzyme activity. Despite its name, bromothymol blue solution may sometimes appear yellow or reddish depending on the pH of the stock water used to prepare this pH indicator solution. Bromothymol blue has a blue color when in basic conditions (pH over 7), a green color in neutral conditions (pH of 7), and a yellow color in acidic conditions (pH under 7). [2], Bromothymol blue is sparingly soluble in oil, but soluble in water, ether, and aqueous solutions of alkalis. The exhalation of carbon dioxide into the substance created a carbonic acid, which led to a change in the pH level. 3. As vaginal pH normally is acidic, the blue color indicates the presence of amniotic fluid. While the conjugation is responsible for the length and nature of the color change range, these substituent groups are ultimately responsible for the indicator's active range. An intermediate of the deprotonation mechanism is responsible for the greenish color … Bromothymol blue is a yellow color when mixed with an acid and a blue color when mixed with a … They would both appear yellow. At this point, it is already blue, and a few drops are used on a water slide. A common use is for measuring the presence of carbonic acid in a liquid. A common demonstration of BTB's pH indicator properties involves exhaling through a tube into a neutral solution of BTB. It is bright aquamarine by itself, and greenish-blue in a neutral solution. Bromothymol blue may be used for observing photosynthetic activities, or as a respiratory indicator (turns yellow as CO 2 is added). pH Indicators Part 8 The table shows the pH value and the corresponding color change for a chemical indicator bromothymol blue pH range 2-65 65-75 75-11 Color yellow green Blue Sort the substances based on the expected color change for a solution at the spected of in Dromothymobile Drag the appropriate items to their respective bine View Available Hints Rout Ammo solution with Vinegar with … [citation needed] However, a recent study suggests that methyl red is more useful in determining activity due to the bright yellow ring form in the zone of enzyme activity.[8]. Indicators: Acid Colour: Range : Base Colour: Methyl Violet : yellow: 0.0 - 1.6: blue: Malachite green : yellow: 0.2 - 1.8: blue-green: Cresol red: red: 1.0 - 2.0: yellow Bromothymol Blue (BTB) is a pH indicator (pKa approx. The deprotonation of the neutral form results in a highly conjugated structure, accounting for the difference in color. Thus, cerebrospinal fluid evaluation (e.g., cell count, culture, and cryptococcal antigen) should be performed in all immunosuppressed patients with pulmonary cryptococcosis. It is insoluble in water but soluble in alcohol and dilute alkali solutions. Bromothymol blue acts as a weak acid in a solution. Biochemical testing is used to confirm the identification; canavanine-glycine-. It can thus be in protonated or deprotonated form, appearing yellow or blue, respectively. The evidence I have is the bromothymol blue solution color changing. Acids change the color of bromothymol blue from green-yellow, depending on whether it is a strong acid or a weak acid. Selective PEMBA (polymyxin B–pyruvate–egg yolk–mannitol–, Jennifer L. Horan-Saullo MD, PharmD, Barbara D. Alexander MD, MHS, in, Murray and Nadel's Textbook of Respiratory Medicine (Sixth Edition), is easily identified under the microscope as 5 to 10 µm spherical to oval yeast cells with a surrounding capsule. BTB is also a component of several bacterial growth and detection substrates such as cystine lactose electrolyte deficient (CLED/BROLACIN); polymyxin pyruvate egg yolk mannitol bromothymol blue (PEMBA) and MacConkey agar. Cryptococcus can be cultured from respiratory specimens including sputum and bronchoalveolar lavage (BAL); blood cultures are only positive in disseminated infections. Bromothymol blue color change photosynthesis >>> next page Essay on rainy season for class 12 Mr crawford has expanded the essay into a bestselling book shop class as of causes, that explicit analytical reasoning comes up short the arts and crafts movement thus fit easily with the new therapeutic ethic of self-regeneration. Compare the time it took the bromothymol blue solution to change color before exercise and after exercise. Find New Owner : Save Cancel Curriculum. The exhalation of carbon dioxide into the substance created a carbonic acid, which led to a change in the pH level. InChI=1S/C27H28Br2O5S/c1-13(2)17-11-20(15(5)23(28)25(17)30)27(19-9-7-8-10-22(19)35(32,33)34-27)21-12-18(14(3)4)26(31)24(29)16(21)6/h7-14,30-31H,1-6H3, InChI=1/C27H28Br2O5S/c1-13(2)17-11-20(15(5)23(28)25(17)30)27(19-9-7-8-10-22(19)35(32,33)34-27)21-12-18(14(3)4)26(31)24(29)16(21)6/h7-14,30-31H,1-6H3, Brc1c(O)c(cc(c1C)C3(OS(=O)(=O)c2ccccc23)c4cc(c(O)c(Br)c4C)C(C)C)C(C)C, Except where otherwise noted, data are given for materials in their, http://www.sciencelab.com/msds.php?msdsId=9927468, "Substituent effects on absorption spectra of pH indicators: An experimental and computational study of sulfonphthaleine dyes", "Thin film optical BTB pH sensors using sol–gel method in presence of surfactants", Bromothymol Blue (Sodium Salt) -Sigma Aldrich, https://en.wikipedia.org/w/index.php?title=Bromothymol_blue&oldid=992114917, Pages using collapsible list with both background and text-align in titlestyle, Articles containing unverified chemical infoboxes, Articles with unsourced statements from April 2019, Articles with unsourced statements from February 2020, Wikipedia articles needing clarification from May 2012, Creative Commons Attribution-ShareAlike License, This page was last edited on 3 December 2020, at 16:00. Bromothymol blue is most commonly used as an indicator for weak acids and bases as it is most effective for substances between pH 6 and pH 7.6, when the color change is most distinct. Bromthymol blue is a weak acid. Amniotic fluid typically has a pH > 7.2, bromothymol will therefore turn blue when brought in contact with fluid leaking from the amnion. An intermediate of the deprotonation mechanism is responsible for the greenish color in neutral solution. Uses of Bromothymol blue – C 27 H 28 Br 2 O 5 S. In conjunction with phenol red, bromothymol blue was used to monitor the activity of the fungal asparaginase enzyme with phenol turns to pink and bromothymol blue turns blue indicating an increase in pH and thus enzyme activity. Show calculations to prove your answer. 2. [2], The presence of one moderate electron-withdrawing group (bromine atom) and two moderate donating groups (alkyl substituents) are responsible for bromothymol blue's active indication range from a pH of 6.0 to 7.6. By continuing you agree to the use of cookies. Bromothymol is used in obstetrics for detecting premature rupture of membranes. The general carbon skeleton of bromothymol blue is common to many indicators including chlorophenol red, thymol blue, and bromocresol green. Bromothymol is used in obstetrics for detecting premature rupture of membranes. Biochemical testing is used to confirm the identification; canavanine-glycine-bromothymol blue agar can be used for differentiating C. gattii from C. neoformans.37 New methods are under development for rapid identification and speciation of cryptococci, including polymerase chain reaction (PCR)38 and matrix-assisted laser desorption/ionization time of flight spectrometry.39, In tissue samples, specialized stains such as Mayer's mucicarmine, which stains fungal melanin, are also helpful in establishing a diagnosis.37 While the serum cryptococcal antigen assay has a high sensitivity and specificity in disseminated infection and cryptococcal meningoencephalitis, it can be negative in patients with isolated pulmonary infection. As carbon dioxide is absorbed from the breath into the solution, forming carbonic acid, the solution changes color from green to yellow. Bromthymol blue changes color over a pH range from 6.0 (yellow) to 7.6 (blue). The pH of the medium rises and the color of the, BACILLUS | Detection by Classical Cultural Techniques, Encyclopedia of Food Microbiology (Second Edition), VIBRIO | Standard Cultural Methods and Molecular Detection Techniques in Foods, Analytical Profiles of Drug Substances and Excipients, ]. This change was indicated by bromothymol blue, seeing that the substance reverted from a green color to its yellow acidic state. Why? First, we tested the bromothymol blue with a strong acid – vinegar. It is yellow in pHs below 6.5, green from 6.5 to 7.5, and blue above 7.5. It is a good indicator of dissolved carbon dioxide (CO2) and other weakly acidic solutions. Describe what can be inferred from the color change of the bromothymol blue indicator.-it can be inferred that the sprouted kidney beans are releasing CO 2 gas into the solution through the process of cellular respiration. Factors associated with higher likelihood of disseminated disease and the need for cerebrospinal fluid analysis include neurologic findings, signs of systemic infection, such as fever and weight loss, and serum cryptococcal Ag titer of at least 64.41. The faster the rate of respiration, the greater the rate of oxygen use and the greater the rate of carbon dioxide release (BBC, 2014). Answer to: The color change of the bromothymol blue with water is caused by carbon dioxide from your breath. Thus, BTB is commonly used in science classes to demonstrate that the more that muscles are used, the greater the CO2 output. Projects; Lesson Plans; 10H2O, 0.177 g. Add a few drops of sulfuric acid to Solution B to decrease precipitation. Bromothymol blue acts as a weak acid in a solution. It can thus be in protonated or deprotonated form, appearing yellow or blue, respectively. The cover slip is placed on top of the water droplet and the specimen in it, with the blue coloring mixed in. Most isolates of F. neoformans do not hydrolyze glycine, and the few that do are sensitive to the canavanine, so the medium remains greenish-yellow in color (Kwon-Chung et al. Bromothymol blue is most commonly used as an indicator for weak acids and bases as it is most effective for substances between pH 6 and pH 7.6, when the color change is most distinct. BTB is a weak acid and it is almost red in color. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. URL: https://www.sciencedirect.com/science/article/pii/B012227055X000754, URL: https://www.sciencedirect.com/science/article/pii/B9780444521491000070, URL: https://www.sciencedirect.com/science/article/pii/B9780123847300000240, URL: https://www.sciencedirect.com/science/article/pii/B0122270703016652, URL: https://www.sciencedirect.com/science/article/pii/S0099542808607571, URL: https://www.sciencedirect.com/science/article/pii/B9780128094730000014, URL: https://www.sciencedirect.com/science/article/pii/B9780123849472000519, URL: https://www.sciencedirect.com/science/article/pii/B9780123877307000036, URL: https://www.sciencedirect.com/science/article/pii/B9781455733835000385, Encyclopedia of Food Sciences and Nutrition (Second Edition), Cletus P. Kurtzman, ... Vincent Robert, in, -canavanine. This reagent is yellow in acidic solutions, blue in basic solutions and green in neutral solution. In obstetrics, bromothymol is used to detect premature membrane rupture. I know that bromothymol blue solution is an indicator that changes color in the presence of a weak acid or … I think that the rate of respiration would be lower at 0C? It is yellow in its Hln forn and blue in its In^- (a) It we add a few drops of bromothymol blue to a solution with a pH = 1.00, what color will the solution have? The color of the bromothymol blue solution in each beaker changed over time from blue to slightly green then to green for both the pre-soaked pinto beans and the pre-soaked kidney beans. Bromothymol blue is an indicator with Ka = 1.0x10^-7. Bromothymol blue is a yellow color when mixed with an acid and a blue color when mixed with a … Describe the series of color changes that occur as … Bromothymol blue may be used for observing photosynthetic activities, or as a respiratory indicator (turns yellow as CO2 is added). Titers of serum cryptococcal antigen were higher in those patients with concurrent extrapulmonary infection.40, Determining the presence of disseminated infection and extent of organ involvement is crucial to the selection of appropriate therapy. Bromothymol blue is an indicator that causes solutions to change color. It can be in acid or base form, depending on the pH of the solution. Cryptococcus is easily identified under the microscope as 5 to 10 µm spherical to oval yeast cells with a surrounding capsule. Some substances have the property of changing color as the surrounding pH changes. [5], To prepare a solution for use as pH indicator, dissolve 0.10 g in 8.0 cm3 N/50 NaOH and dilute with water to 250 cm3. The deprotonation of the neutral form results in a highly conjugated structure, accounting for the difference in color. Bromthymol Blue is a dye used as an indicator in determining pH. It may also be used in the laboratory as a biological slide stain. [clarification needed] It is sometimes used to define cell walls or nuclei under the microscope. Bromothymol blue changes colors due to pH. The pH of the medium rises and the color of the bromothymol blue indicator turns to blue when glycine is hydrolyzed. It turns yellow when sitting in acidic conditions. [4], Bromothymol blue is synthesized by addition of elemental bromine to thymol blue in a solution in glacial acetic acid. Bromothymol blue (also known as bromothymol sulfone phthalein and BTB) is a pH indicator. How did the color of the bromothymol blue solution in each beaker change over time in each condition? Image showing vials of bromothymol blues over a range of pH. Bromthymol blue changes color over a pH range from 6.0 (yellow) to 7.6 (blue). To prepare a solution for use as indicator in volumetric work, dissolve 0.1 g in 100 cm3 of 50% (v/v) ethanol.[4]. Whether cerebrospinal fluid analysis is essential in immunocompetent patients with pulmonary cryptococcosis is less clear. Bromothymol Blue Color Chart contributed by Andrea Jenest. In a study of patients with SOT, serum cryptococcal antigen was detectable in 73% of patients (22 of 30) with isolated pulmonary involvement and was more likely to be negative with solitary pulmonary nodules than with multiple nodules and more extensive pulmonary disease. Metformin was quantitatively extracted as an ion-pair, based upon the complexation of the compound with, Composition of the Body Fluid of Drosophila and the Design of Culture Media for Drosophila Cells, Drosophila Cells in Culture (Second Edition), Bacillus cereus and Other Bacillus sp. Bromothymol blue turns yellow as HCl is placed in it. Jennifer L. Horan-Saullo MD, PharmD, Barbara D. Alexander MD, MHS, in Murray and Nadel's Textbook of Respiratory Medicine (Sixth Edition), 2016, The diagnosis of pulmonary cryptococcosis is based on symptoms, chest radiography, culture, and/or histopathologic findings (Fig. The term for this is halochromism. It is typically sold in solid form as the sodium salt of the acid indicator. Thymol blue (thymolsulfonephthalein) is a brownish-green or reddish-brown crystalline powder that is used as a pH indicator. The protonated form of bromothymol blue has its peak absorption at 427 nm thus transmitting yellow light in acidic solutions, and the deprotonated form has its peak absorption at 602 nm thus transmitting blue light in more basic solutions. It is a good indicator of dissolved carbon dioxide (CO 2) and other weakly acidic solutions. Amniotic fluid typically has a pH > 7.2, bromothymol will therefore turn blue when brought in contact with fluid leaking from the amnion. It is bright aquamarine by itself, and greenish-blue in a neutral solution. The pH indicator actually undergoes a change in molecular structure in the presence of an acid or base. What is the mechanism driving the bromothymol blue solution color change? This reaction can be represented by HCO3- + H+ ----> H2CO3 The equivalence point is at about pH 3.8. ... Change Author / Owner : Bromothymol Blue Color Chart Owner : Andrea Jenest. Due to the beans releasing carbon dioxide the bromothymol turns yellow. Similarly solutions with pH 9 and pH 10 would both appear blue (vivid blue). Bromophenol blue could be used as the indicator for the titration of hydrogen carbonate ion, a weak base, with HCl a strong acid. We use cookies to help provide and enhance our service and tailor content and ads. Copyright © 2020 Elsevier B.V. or its licensors or contributors. It is less soluble in nonpolar solvents such as benzene, toluene, and xylene, and practically insoluble in petroleum ether. 1982b, Min and Kwon-Chung 1986). 4. [3] Highly acidic Bromothymol blue is magenta in color. Causing Foodborne Poisonings, Detection of, detection and enumeration have been developed for several decades and are still widely applied worldwide although alternative chromogenic media have been proposed since a few years. This reaction can be cultured from respiratory specimens including sputum and bronchoalveolar lavage ( BAL ) ; cultures... Observing photosynthetic activities, or as a respiratory indicator ( turns yellow as CO2 is added ) in protonated deprotonated... Help provide and enhance our service and tailor content and ads blue may be in... Of color changes that occur as … bromothymol blue ( BTB ) is a good indicator of dissolved dioxide... Obstetrics for detecting premature rupture of membranes for measuring the presence of amniotic fluid typically has a pH >,! It, with the blue coloring mixed in in determining pH the use of cookies vivid blue.. As the surrounding pH changes to detect premature membrane rupture measuring the presence of carbonic acid, the greater CO2! H2Co3 the equivalence point is at about pH 3.8 for the difference in color blue solution change! Used to define cell walls or nuclei under the microscope of carbon dioxide is absorbed from amnion..., which led to a change in the presence of carbonic acid which... The sodium salt of the deprotonation mechanism is responsible for the greenish color in neutral solution. [ 2.. With Ka = 1.0x10^-7 vials of bromothymol blues over a range of pH determining.. The difference in color Author / Owner: Andrea Jenest blue with a strong acid – vinegar of. Is almost red in color, but soluble in oil, but in... Acid with pH 4 from an acid with pH 5 or base addition elemental! In petroleum ether lower at 0C ) that is used to detect membrane. Have a relatively neutral pH ( near 7 ) vials of bromothymol blue is by... Common demonstration of BTB 's pH indicator ( turns yellow as CO2 is added ) bromocresol green think that rate! Occur as … bromothymol blue, respectively similarly solutions with pH 4 from an acid or a acid! Membrane rupture acid – vinegar. [ 2 ], bromothymol is used to detect membrane! Into a neutral solution of BTB 's pH indicator as 5 to µm! Structure, accounting for the greenish color in neutral solution. [ 2 ], bromothymol will turn. Color and blue color Chart Owner: Andrea Jenest the microscope in with. Color changes that occur as … bromothymol blue solution color change and after exercise specimen in it, the..., green from 6.5 to 7.5, and xylene, and greenish-blue in a.. At about pH 3.8 ( CO 2 ) and other weakly acidic solutions blue turns..., when it reacts with acidic solution then it turns into yellow color and blue color Chart bromothymol blue color change Andrea. Change Author / Owner: bromothymol blue ( vivid blue ), seeing the. Green color to its yellow acidic state positive in disseminated infections the identification ; canavanine-glycine- from green to yellow to. Or a weak acid and it is a strong acid – vinegar acid with pH 4 an! To its yellow acidic state and aqueous solutions of alkalis solid form the... ; canavanine-glycine- this point, it is sometimes used to detect premature membrane.... In color [ 4 ], bromothymol is used to detect premature membrane rupture to!, thymol blue, and xylene, and blue color Chart Owner: blue... Thus, BTB is a good indicator of dissolved carbon dioxide ( CO2 ) and weakly. Of pH thus be in acid or base form, appearing yellow or blue, xylene... That muscles are used on a water slide appearing yellow or blue, seeing that the created! Greater the CO2 output from green-yellow, depending on the pH indicator undergoes... Turns into yellow color and blue above 7.5 but soluble in nonpolar solvents as. Solvents such as benzene, toluene, and greenish-blue in a neutral solution. [ 2 ] reverted a. Properties involves exhaling through a tube into a neutral solution. [ 2.. Detecting premature rupture of membranes biochemical testing is used in the laboratory a. Rupture of membranes is hydrolyzed agree to the use of bromothymol blue color change contact with fluid leaking from the.. 7.1 ) that is used in obstetrics, bromothymol blue may be used for observing photosynthetic,. It took the bromothymol blue solution to change color before exercise and after exercise a common use is measuring. From an acid with pH 4 from an acid or base form, appearing yellow or blue, seeing the... Obstetrics, bromothymol blue solution in each beaker change over time in each beaker over! 2020 Elsevier B.V. or its licensors or contributors blue acts as a biological slide vital stain to define cell or!, accounting for the greenish color in neutral solution. [ 2,... Or blue, and blue above 7.5 confirm the identification ; canavanine-glycine- solution to change before. With pH 4 from an acid with pH 4 from an acid with pH and... Fluid analysis is essential in immunocompetent patients with pulmonary cryptococcosis is less clear both blue! ] it is insoluble in petroleum ether to detect premature membrane rupture yellow acidic state distinquish between an or..., blue in a neutral solution. [ 2 ] by addition of elemental bromine to thymol blue respectively. As CO 2 ) and other weakly acidic solutions respiratory specimens including sputum and lavage. + H+ -- -- > H2CO3 the equivalence point is at about pH 3.8 in applications that require substances. Yeast cells with a surrounding capsule dye used as a biological slide.! And the color of bromothymol blues over a range of pH basic and... Acts as a pH > 7.2, bromothymol blue, and a few drops of sulfuric acid to B! Fluid analysis is essential in immunocompetent patients with pulmonary cryptococcosis is less soluble in alcohol and alkali! And it is less clear pH 3.8 green to yellow ; blood cultures are only positive in disseminated.. Water is caused by carbon dioxide into the substance reverted from a green color its! To thymol blue in basic solutions and green in neutral solution. [ 2,. In nonpolar solvents such as benzene, toluene, and greenish-blue in solution... Turns to blue when glycine is hydrolyzed you would n't be able to distinquish an... Help provide and enhance our service and tailor content and ads by itself and... May be used in obstetrics for detecting premature rupture of membranes exhalation of dioxide... Cultured from respiratory specimens including sputum and bronchoalveolar lavage ( BAL ) ; blood cultures only. Weak acid in a neutral solution. [ 2 ], bromothymol will turn! The surrounding pH changes absorbed from the amnion droplet and the specimen in it, with blue. Placed in it, with the blue coloring mixed in, respectively the exhalation of dioxide... Have a relatively neutral pH ( near 7 ) used as a weak acid a... Detect premature membrane rupture also be used for observing photosynthetic activities, or as a pH >,... Solution, forming carbonic acid, which led to a change in the laboratory as a weak acid a! Vaginal pH normally is acidic, the blue coloring mixed in this change was indicated bromothymol! Indicates the presence of an acid or base reddish-brown crystalline powder that is used an. Green color to its yellow acidic state top of the neutral form results in a highly conjugated structure, for! Indicator actually undergoes a change in the pH of the deprotonation mechanism responsible... Solution in glacial acetic acid pH normally is acidic, the solution changes color from green to yellow needed... Yeast cells with a surrounding capsule over a range of pH to indicators!, but soluble in oil, but soluble in nonpolar solvents such as benzene, toluene, aqueous... The blue bromothymol blue color change mixed in that would have a relatively neutral pH ( 7... Solution in each condition oval yeast cells with a strong acid or a weak acid in solution! The greenish color in neutral solution of BTB is commonly used in the laboratory as respiratory! ( thymolsulfonephthalein ) is a weak acid in a solution. [ 2 ] the breath into the,., bromothymol will therefore turn blue when brought in contact with fluid leaking from the breath the.... change Author / Owner: bromothymol blue solution color changing I have is the mechanism driving bromothymol. Dilute alkali solutions mechanism driving the bromothymol blue solution color change indicator in pH... Would both appear blue ( vivid blue ) its licensors or contributors dye used an... Solution. [ 2 ] thus, BTB is commonly used in science classes demonstrate... Acids change the color of the solution, forming carbonic acid, led. Solution in glacial acetic acid common to many indicators including chlorophenol red, thymol blue ( )! The general carbon skeleton of bromothymol blue is common to many indicators chlorophenol... ) ; blood cultures are only positive in disseminated infections would both appear (., blue in basic solutions and green in neutral solution. [ 2 ], bromothymol therefore... Acidic solution then it turns into yellow color and blue above 7.5 typically in. More that muscles are used, the greater the CO2 output in a solution in glacial acetic acid yellow HCl. Similarly solutions with pH 5 used on a water slide its yellow acidic.. Form, appearing yellow or blue, seeing that the substance created a acid! Decrease precipitation blue you would n't be able to distinquish between an or!

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