高产类胡萝卜素红酵母的筛选及其发酵条件

通过对数株红酵母培养后发酵液中菌体生物量及类胡萝卜素含量的测定比较,从中选出了1株产类胡萝卜素能力较强的红酵母RY-98;研究了该菌株产类胡萝卜素的最适碳源和氮源,并对其主要营养与环境条件进行了选择及优化,获得了最佳发酵条件葡萄糖40g/L、(NH     

Effect of Rare Earths on Plant under Supplementary Ultraviolet-B Radiation: Ⅰ Effect of Cerium on Growth and Photosynthesis in Rape Seedlings Exposed to Supplementary Ultraviolet-B Radiation

Theapplicationofrareearth(RE)inagriculture initiallyoriginatedfromChina.Itdeservesexclusive intellectualpropertyright,whichstandsforadvancedtechnologyinthefield.Ithasalreadybeenprovedthat REplaysanimportantroleinimprovingproduction andqualityofcropsandall…     

Tb(Ⅲ)对辣根若干生理生化指标的影响

以辣根为实验材料,研究不同浓度的Tb(Ⅲ)对辣根过氧化物酶(HRP)、辣根超氧化物岐化酶(SOD)、过氧化氢(H2O2)的影响,结果表明,低浓度Tb(Ⅲ)对辣根的生长有一定的刺激作用,高浓度Tb(Ⅲ)则对辣根生长有抑制作用.表现为,随着Tb(Ⅲ)浓度的增加,HRP和SOD酶活先增高,后减小;H2O2含量先减少后增加.最适浓度处HRP活性增加了5.3%,SOD活性增加了33.36%,H2O2含量减少了11.68%.低浓度Tb(Ⅲ)不能显著提高辣根抗逆性,Tb(Ⅲ)对辣根的作用主要表现为毒理效应.     

Effect of Rare Earths on Plants under Supplementary Ultraviolet-B Radiation： Ⅱ. Effect of Cerium on Antioxidant Defense System in Rape Seedlings under Supplementary Ultraviolet-B Radiation

Theincreaseingroundlevelultraviolet Bradi ation(UV B,280～320nm)asaresultofstrato sphericozonedepletionmayhavemajordeleteriousef fectsoncropphotosynthesisandproduction.Asone majorenvironmentalproblem,ithasattractedmore andmoreattentionofresearchers,andthereforethere havebeensubstantiveandtimelyreports,providing abundantinformationaboutthedamageofUV Bradi ationoncrops.However,thestudiesabouttheecolog icalprotectionofplantsagainstdamageofUV Bradi ationarecomparativelyfew.Wehavepreviouslyre p…