| litmus | <chemistry> A dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain colouring matters related to orcin and orcein. Litmus is used as a dye, and being turned red by acids and restored to its blue colour by alkalies, is a common indicator or test for acidity and alkalinity. <chemistry> Litmus paper, unsized paper saturated with blue or red litmus, used in testing for acids or alkalies. Origin: D. Lakmoes; lak lacker + moes a thick preparation of fruit, pap, prob. Akin to E. Meat: cf. G. Lackmus. See Lac a resinous substance. Source: Websters Dictionary (01 Mar 1998) |
|---|
| lactose-litmus agar | Agar made by adding 2% lactose and litmus to acid-free nutrient agar; formerly used in the identification of Salmonella typhi. (05 Mar 2000) |
|---|
| litmus test |
litmus: a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator a test that relies on a single indicator; "her litmus test for good breeding is whether you split infinitives"
Ãâó: wordnet.princeton.edu/perl/webwn
|
|---|---|
| litmus |
a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator
Ãâó: wordnet.princeton.edu/perl/webwn
|
| litmus paper |
unsized paper treated with litmus for use as an acid-base indicator
Ãâó: wordnet.princeton.edu/perl/webwn
|
| litmus paper |
bibulous paper impregnated with a solution of litmus, dried, and cut into strips. If slightly alkaline, the paper is blue and is used as a test for acids, which turn it red; if slightly acid, it is red and alkalis turn it blue.
Ãâó: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
|
| litmus |
A pH indicator paper (range 4.5-8.3) impregnated with an extracted lichen pigment. It turns red in acidic and blue in alkaline solutions. However, the use of litmus paper as an indicator is not a precise method of pH measurement.
Ãâó: www.fao.org/docrep/003/X3910E/X3910E15.htm
|
| litmus | a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions |
|---|---|
| litmus | unsized paper treated with litmus for use as an acid-base indicator |
| litmus | a test that relies on a single indicator |
| litmus | a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions |
Á¦Ç°¸í |
ÆÇ¸Å»ç |
º¸ÇèÄÚµå | ¼ººÐ/ÇÔ·® | ±¸ºÐ/º¸Çè±Þ¿© |
|---|
Á¦Ç°¸í |
ÆÇ¸Å»ç |
º¸ÇèÄÚµå | ¼ººÐ/ÇÔ·® | ±¸ºÐ/º¸Çè±Þ¿© |
|---|