本文選題：黃龍 + 嗜冷細(xì)菌��； 參考：《高校地質(zhì)學(xué)報(bào)》2017年04期

【摘要】：黃龍景區(qū)高寒冷水型鈣華沉積地貌環(huán)境中生存著大量的嗜冷微生物。為了探究這些微生物在低溫及高濃度Ca~(2+)和HCO_3~-水環(huán)境中的代謝產(chǎn)物對(duì)鈣華沉積的影響,本實(shí)驗(yàn)選取黃龍嗜冷細(xì)菌的兩種特征代謝產(chǎn)物L(fēng)-苯丙氨酸和L-半胱氨酸,通過(guò)模擬低溫、含較高濃度的Ca~(2+)和HCO_3~-的實(shí)驗(yàn)環(huán)境,并利用X射線衍射儀(XRD)、傅里葉變換紅外光譜儀(FT-IR)、掃描電子顯微鏡(SEM)等分析方法,來(lái)探討氨基酸對(duì)礦化體系中碳酸鈣沉積速率及其晶型和形貌的影響。實(shí)驗(yàn)結(jié)果表明:在特定模擬環(huán)境條件下,(1)L-苯丙氨酸和L-半胱氨酸均能促進(jìn)碳酸鈣的沉積。L-苯丙氨酸對(duì)晶型影響不大,產(chǎn)物均為方解石型碳酸鈣,但是L-苯丙氨酸能抑制方解石晶面棱邊的生長(zhǎng),使得晶體出現(xiàn)多面不規(guī)則的立方體形態(tài);(2)L-半胱氨酸除誘導(dǎo)并促進(jìn)方解石型碳酸鈣的合成外還可以誘導(dǎo)文石型碳酸鈣的合成。該結(jié)果可為黃龍地區(qū)鈣華的生物成因研究提供一定的基礎(chǔ)數(shù)據(jù)。
[Abstract]:A large number of chilling microbes exist in the alpine and cold water Calciferous sedimentary geomorphological environment in Huanglong Scenic area. In order to investigate the effect of metabolites of these microbes in low temperature and high concentration Ca~(2) and HCO _ 3C _ 3-water environment on calcium deposition, we selected Lphenylalanine and L-cysteine, two characteristic metabolites of thermophilic bacteria in Huanglong, and simulated them at low temperature. In the experimental environment containing high concentration of Ca~(2) and HCOC _ 3-, and using X-ray diffractometer, Fourier transform infrared spectrometer (FTIR), scanning electron microscope (SEM) and other analytical methods, To study the effect of amino acids on the deposition rate, crystal form and morphology of calcium carbonate in mineralized system. The results showed that both L-phenylalanine and L-cysteine could promote the deposition of calcium carbonate. L- phenylalanine had little effect on the crystal type of calcium carbonate, and the products were calcite calcium carbonate. However, L- phenylalanine can inhibit the growth of the edge of calcite crystal and induce the synthesis of aragonite type calcium carbonate in addition to inducing and promoting the synthesis of calcite type calcium carbonate. The results can provide some basic data for the study of the biogenesis of Calcifera in Huanglong area.
【作者單位】： 西南科技大學(xué)生命科學(xué)與工程學(xué)院;黃龍國(guó)家級(jí)風(fēng)景名勝管理局;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41472309;41572035)
【分類號(hào)】：P611
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本文編號(hào)：1885468