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新建平房仓磷化氢环流熏蒸杀虫试验 总被引:2,自引:0,他引:2
文章主要论述磷化氢环流熏蒸中,仓房气密性与熏蒸浓度的关系、“动态潮解”产气法的简便性和经济性,并提出了在目前仓房条件下应采用的熏蒸浓度与密闭时间。 相似文献
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湖泊沉积物内源磷分布及其相关性研究 总被引:1,自引:0,他引:1
以太湖为研究对象,研究了湖泊内源磷以磷化氢形态的释放问题。结果表明,湖泊沉积物中的磷主要以铁磷和钙磷形态存在。湖泊沉积物中磷化氢含量与总磷、溶解态磷、铁磷、钙磷、铝磷呈显著相关,与有机磷、闭蓄态磷、交换态磷相关性不显著,表明在沉积物各种形态磷转化为磷化氢的机制中,无机磷最有可能为磷化氢形成的前体物,磷化氢可能作为富营养化湖泊中磷的生物地球化学循环的一部分,参与沉积物磷的释放过程。 相似文献
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磷酸盐还原为磷化氢功能菌株的筛选与鉴定 总被引:2,自引:0,他引:2
利用厌氧培养反应瓶和筛选培养基以A2/O厌氧池、污泥浓缩池的污泥、养殖场新鲜猪粪、鸡粪、牛粪及鸭粪为种泥,通过跟踪厌氧培养过程培养液中总磷的去除率和吸收液中磷化氢的生成量筛选出最佳种泥,并对最佳种泥进行厌氧条件下能将磷转化为磷化氢的菌株进行了筛选、分离和鉴定.结果表明,6种泥中鸡粪的厌氧除磷能力最强,鸭粪能力最弱,污泥浓缩池中的污泥和猪粪次之,牛粪及厌氧池污泥有一定的作用.本实验条件下鸡粪是厌氧除磷工艺的最佳种泥,将成为今后生物除磷工艺厌氧除磷菌种增殖、驯化的首选污泥.在1周期7 d内鸡粪的最佳培养时间为5 d.鸡粪培养液经21 d培养后分离到2株肠杆菌科、2株真杆菌属和1株丁酸弧菌属,均是厌氧条件下磷酸盐还原为磷化氢的菌株,真杆菌属和丁酸弧菌属为首次分离到. 相似文献
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钼膦系缓蚀剂协同效应的分析 总被引:2,自引:2,他引:0
戴秋秋 《金陵科技学院学报》2006,22(2):49-53
以钼酸钠(Na2MoO4.2H2O),1-羟基乙叉二膦酸(HEDP)和硫酸锌(ZnS04.7H20)为原药,分别组成一元、二元和三元等复合缓蚀剂配方,通过不同的实验方法(失重法和电化学方法)研究了钼膦系缓蚀剂对碳钢在循环冷却水中的缓蚀协同效应,着重讨论了钼膦系缓蚀剂对不同材质在不同介质中,缓蚀剂对腐蚀速率和缓蚀的影响。通过大量的实验,用三角形图解法研究了在实验浓度范围内,缓蚀率、腐蚀速率与缓蚀剂配方浓度比之间的变化规律。为开发新一代低成本、高效能的钼磷系复配缓蚀剂提供了经济、高效的配方和准确、可靠的理论依据。 相似文献
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The hatching and mortality response of 0- to 48-h-old eggs of field strains of the stored-product insects Cryptolestes ferrugineus (Stephens), Lasioderma serricorne (F) and Oryzaephilus surinamensis (L) following phosphine fumigation for 24, 48 or 120 h at 27 (+/- 2) degrees C was investigated. Hatching was delayed and reduced in the first few days in a phosphine-resistant strain of C ferrugineus that was treated with 2.0-7.0 mg litre(-1) doses for 48 h (5-80% mortality) and with 1.0-2.0 mg litre(-1) for 120 h (44-84% mortality). In both the exposures there were significant increases in hatching on later days when compared with the corresponding controls. Developmental delay was, however, not evident in susceptible strains of C ferrugineus, L serricorne and O surinamensis that were exposed to phosphine for 24 h. 相似文献
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This study aimed at elucidating SS-bonds of HMW-gliadins (HGL) from wheat with the focus on terminators of glutenin polymerisation. HGL from wheat flour extracts non-treated or treated with the S-alkylation reagent N-ethylmaleinimide (NEMI) were compared. HGL from wheat flour Akteur were isolated, hydrolysed with thermolysin and the resulting peptides pre-separated by gel permeation chromatography and analysed by liquid chromatography/mass-spectrometry using alternating electron transfer dissociation/collision-induced dissociation. Altogether, 22 and 28 SS-peptides from samples without and with NEMI treatment, respectively, were identified. Twenty-six peptides included standard SS-bonds of α- and γ-gliadins, high-molecular-weight and low-molecular-weight glutenin subunits. Eleven SS-bonds were identified for the first time. Fifteen peptides unique to HGL contained cysteine residues from gliadins with an odd number of cysteines (ω5-, α- and γ-gliadins). Thus, gliadins with an odd number of cysteines, glutathione and cysteine had acted as terminators of glutenin polymerisation. Decisive differences between samples without and with NEMI treatment were not obvious showing that the termination of polymerisation was already completed in the flour. The two HGL samples, however, were different in the majority of ten peptides that included disulphide-linked low-molecular-weight (LMW) thiols such as glutathione and cysteine with the former being enriched in the non-treated HGL-sample. 相似文献
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Anna Esposito Daniele DAlonzo Stefano DErrico Eliana De Gregorio Annalisa Guaragna 《Marine drugs》2020,18(11)
In the effort to improve the antimicrobial activity of iminosugars, we report the synthesis of lipophilic iminosugars 10a–b and 11a–b based on the one-pot conjugation of both enantiomeric forms of N-butyldeoxynojirimycin (NBDNJ) and N-nonyloxypentyldeoxynojirimycin (NPDNJ) with cholesterol and a succinic acid model linker. The conjugation reaction was tuned using the established PS-TPP/I2/ImH activating system, which provided the desired compounds in high yields (94–96%) by a one-pot procedure. The substantial increase in the lipophilicity of 10a–b and 11a–b is supposed to improve internalization within the bacterial cell, thereby potentially leading to enhanced antimicrobial properties. However, assays are currently hampered by solubility problems; therefore, alternative administration strategies will need to be devised. 相似文献