Yuav ua li cas yog urea? Piav yooj yooj yim thiab pheej yig

Yuav ua li cas yog urea, thiab dab tsi yog qhov keeb kwm ntawm nws keeb kwm? Yog vim li cas nws yog li ntawd hu ua, qhov twg nws yog siv? Sim kom to taub.

Keeb kwm ntawm lub foundations ntawm urea

Nws hloov tawm mus rau piss nws muaj ib tug ncaj qha kev sib raug zoo. Nyob rau hauv 1773, Fabkis chemist Hilaire Ruel Maren xaiv nws los ntawm tib neeg cov zis. Tom qab ntawd, nyob rau hauv 1828, lub German chemist thiab tus kws kho mob Fridrih Voler los ntawm evaporation ntawm yaj ammonium cyanate (NH ₄ CNO) tau txais los ntawm ib tug inorganic tshuaj ib organic compound, los ntawm nws tus yam ntxwv xws urea. Nws yog nrog qhov kev tshwm sim pib keeb kwm ntawm cov organic Science News for KIDS, raws li zoo raws li thawj organic compound yog tau synthetically. Tsis yog khoom txhua ntawm kev tshawb fawb yuav khav hais tias nws qhib yog ib tug tshiab science.

Yuav ua li cas yog lub urea thiab nyob qhov twg nws tawm los ntawm

Tseem, urea - yog dab tsi? Qhov no tshuaj compound uas muaj ib tug khoom qauv thiab pib ib tug kev tawg ri niab ntawm dawb los yog weakly dawb lias ntxhiab crystalline granules. Formula urea - NH2CONH2. Nws lub npe - urea. Cov tshuaj yeeb dej caw yog nkag soluble nyob rau hauv cov dej. Cov tshwm sim ntawm urea tebchaw ntxhia acids, siab tshuaj ua si yog ntsev.
Nyob rau cov nqe lus nug ntawm yog dab tsi urea, los ntawm tus taw tes ntawm view ntawm lub physiology ntawm lub cev, yuav tsum teb hais tias, nws yog tus kawg khoom ntawm protein zom cov zaub mov nyob rau hauv cov tsiaj thiab ntses. Lub biochemical muaj pes tsawg leeg ntawm cov ntshav yuav tsum tau muaj urea. Maximum urea cai ntshav me nyuam mus txog rau 14 xyoo - 6.4 mmol / l, nrog lub hnub nyoog, cov ntsiab lus ntawm urea nyob rau hauv cov ntshav yog ntau zog rau 7.5 mmol / l.

Kev npaj ntawm lub urea tshwm sim muaj txoj kev nrog cov pa roj carbon dioxide thiab ammonia synthesis tshuaj tiv thaiv ntawm Bazarova. Vim hais tias ntawm no, zus tau tej cov urea yog ua ke nrog rau zus tau tej cov lwm yam khoom raws li ammonia.

Yog vim li cas urea

Thiab dab tsi yog qhov urea nyob rau hauv lub lag luam? Vim li cas nws cov hom phiaj yog tsim? Nyob rau hauv lub muaj zus tau tej cov resins, adhesives siv nyob rau hauv qhov siv thiab ua fiber boards thiab nyob rau hauv lub rooj tog kev lag luam, siv cov qhab nia A. urea urea tib yam hom yog siv nyob rau hauv lub roj av lag luam kev tshem tawm cov tshuaj los ntawm paraffinic roj thiab los ntawm cov roj. Qhov no tawm mos paraffin, tsim nyog nyob rau hauv zus tau tej cov protein-vitamin txhais tau tias, fatty acids thiab alcohols, ntau yam detergents.

Lwm cheeb tsam ntawm daim ntawv thov ntawm urea - tshem tawm ntawm oxides ntawm nitrogen los ntawm cov pa luam yeeb los ntawm thermal fais fab nroj tsuag rau pov tseg recycling, boiler thiab thiaj li nyob.

Yuav ua li cas yog urea nyob rau hauv cov kev kho mob kev lag luam?

Urea koom osmotic diuretics nrog slabodeystvuyuschim nyhuv. Nws yog ib tug raw khoom rau qhov siv thiab ua npaj outputting dej los ntawm tib neeg lub cev (lub cev qhuav dej khoom). Cov tshuaj uas yuav tsum tau rau cov kev kho mob ntawm hydrocephalus, cerebral edema ntawm ntau yam etiologies. Tsis tas li ntawd, urea yog siv rau qhov siv thiab ua hypnotics.

Tsis nco koj lub caij nyoog mus koom thiab urea nyob rau hauv lub lag luam ua noj. E927b zaub mov additive - nws yog tsis muaj dab tsi lwm tus tshaj qhov urea. Nws tau foaming zog, ua raws li ib tug amplifier thiab ib tug uas muaj ntxhiab flavoring zaub mov. Siv nyob rau hauv qhov siv thiab ua kev zom khoom ntawm cov pos hniav, los txhim kho qhov zoo ntawm hmoov thiab bakery cov khoom. Thaum ntxiv rau cov poov xab ua khob noom cookie urea ua raws li ib tug as nruab nrab thiab lub nitrogen khoom mus cov poov xab haiv neeg.

Tab sis lub loj feem ntawm lub urea nyob rau hauv lub teb chaws (txhua xyoo ntau lawm ntawm 4 lab tons ib xyoos) mus rau ua liaj ua teb. Manufactured los ntawm urea chiv qib B urea nitrogen khoom yog invaluable, txij li thaum nws - cia li tshaj 46%. Txawm tias muaj tseeb hais tias urea yog zoo kawg nkaus soluble nyob rau hauv dej, nws nws tus kheej absorbs dej heev reluctantly. Qhov no zoo cov yam ntxwv yog zoo heev thiab tso cai rau koj mus procure lub chiv nyob rau hauv loj qhov ntau, tsis muaj kev ntshai tias stocks slezhatsya thiab tig mus rau hauv lub cia pob zeb. Urea muaj ib tug high reactivity thiab heev nkag absorbed los ntawm cov nroj tsuag. Feem ntau, urea yog siv nyob rau hauv preplant kev kho mob theem, ib tug txheej ntawm ntsuab loj ntawm cov nroj tsuag.