陇南地区春播大白菜栽培技术

<正>大白菜具有价格低廉、品质柔嫩、口感酥脆、营养丰富、吃法多样、耐贮存、好运输的优点,深受人们的欢迎。近几年来,随着陇南地区大白菜春播面积逐年增加,但生产上还存在先期抽薹、包球不紧等许多技术难题,严重影响春播大白菜生产的产量和效益。为此,我们于2007～2009年在成县试验基地开展了春播大白菜栽培试验,总结出了相应的栽培技术。     

含共轭三键的聚合物的掺杂机理和导电特性的研究

以聚丁（对甲苯硫酸）－２，４－己炔－１，６－二醇酯（ＰＤＡ－ＴＳ）为例，探讨了含共轭三键的聚合物的掺杂和导电特性的研究，对其微观掺杂机制，在比较现有的掺杂模型的基础上，提出了新的掺杂模型。     

运用AHP法评价福建省铅笔杆用材树种资源

以福建省20种用材树种为研究对象,根据铅笔杆对木材品质的要求,运用层次分析法(AHP)依据树种的尺寸稳定性、脆性、密度和强度、结构、纹理以及胶合涂饰性能等木材特性指标建立层次结构模型和判断矩阵,并根据各项指标的重要性计算其权重,从而确定作为铅笔杆用材树种的优劣次序。结果表明:福建含笑、福建柏、拟赤杨、秃杉及江南桤木为较好的铅笔杆用材,细柄阿丁枫、冬青、花榈木、黄檀及柿树则较差。研究结果可为铅笔杆用材的选择和开发提供参考。     

不同温度烘烤坛紫菜的体外模拟消化研究

为探究不同温度烘烤下坛紫菜的消化情况,本试验通过构建体外消化模型,对不同消化过程中坛紫菜的细胞形态进行观察并测定其营养物质含量和抗氧化活性,分析不同温度烘烤后坛紫菜在消化过程中的变化规律。结果表明,不同温度烘烤的坛紫菜经口胃肠连续消化后,细胞裂解有差异,其中180℃和200℃处理组的坛紫菜细胞裂解程度大。体外消化结果表明,坛紫菜的游离氨基酸含量释放主要集中在胃肠道中,可溶性糖及还原糖主要集中在胃消化过程中,抗氧化活性在胃消化过程中表现最强,其中180℃烘烤坛紫菜的营养物质释放量和抗氧化活性最佳,200℃处理组次之。本研究结果为提高坛紫菜的生物利用率以及评价其不同加工模式提供了一定的理论依据。     

广东石豆兰不同溶剂提取物抗氧化及与总黄酮、总酚含量的关系

为明确广东石豆兰的抗氧化能力及抗氧化成分,以鳞茎为材料,以甲醇、乙醇、丙酮和乙酸乙酯为提取剂得到4种提取物,测定了4种提取物中总黄酮、总酚含量及其抗氧化活性,并分析了两者之间的关系。结果表明,石豆兰总酚含量高于总黄酮,乙醇为总酚和总黄酮2种物质的最佳提取溶剂;甲醇提取物对羟基自由基清除力和对Fe²⁺的螯合力最强,对DPPH自由基清除效果最差;丙酮提取物具有最强的总还原力和清除超氧阴离子的能力,而清除羟基自由基能力最弱;乙酸乙酯提取物清除DPPH自由基的能力最强,但总还原力、清除超氧阴离子的能力、Fe²⁺的螯合力最弱。此外,除了DPPH自由基外,其他4个抗氧化指标与总黄酮或总酚含量呈正相关(0.185<r<0.969),总还原力与总黄酮含量呈显著相关。本研究结果为广东石豆兰抗氧化物质的提取及进一步开发利用提供了参考依据。     

Relationship between histone H3K36 trimethylation and acute renal injury induced by ischemia/reperfusion

AIM: To observe the expression change of H3K36 trimethylation (H3K36me3) in acute kidney injury (AKI) induced by ischemia/reperfusion (IR) and analyze its correlation with SMYD2 and renal injury, and to provide a new target for clinical treatment of IR-AKI. METHODS: The ICR mice (n=30) were randomly divided into IR group (n=15) and sham operation group (sham group, n=15). The AKI model was established by clamping bilateral renal pedicles for 45 min. The serum and renal tissues of the mice were collected after the model was established for 24 h. The levels of blood urea nitrogen (BUN) and serum creatinine (SCr) were detected by biochemical method. The pathological changes of the kidney were observed by HE staining. The changes of NGAL and cleaved caspase-3 were observed by immunohistochemical (IHC) staining. The protein levels of NGAL, SMYD2, H3K36me3, p-P53, P53, cleaved caspase-3, Bax, Bcl-2, STAT3, p-STAT3, JNK and p-JNK1/2/3 in the renal tissues were determined by Western blot. The relationship between H3K36me3 and SMYD2/NGAL was analyzed by Pearson correlation method. RESULTS: Compared with sham group, BUN and SCr levels of the mice in IR group were significantly increased (P<0.05). HE staining showed significant edema, abscission and necrosis in renal tubular epithelial cells of the micc in IR group, and abscission of brush border and large amount of cell debris in the lumen were also observed. The IHC staining results showed that the protein levels of NGAL and cleaved caspase-3 in IR group were significantly increased. The results of Western blot showed that the protein levels of NGAL, SMYD2, H3K36me3, p-P53, cleaved caspase-3, Bax, STAT3, p-STAT3, JNK and p-JNK1/2/3 in IR group were significantly up-regulated (P<0.05), while the Bcl-2 levels were significantly down-regulated (P<0.05). The correlation analysis showed that H3K36me3 was positively correlated with the levels of SMYD2 and NGAL. CONCLUSION: H3K36me3 is closely related to SMYD2 and renal injury in IR-AKI mice, and the up-regulated expression of H3K36me3 may be involved in the regulation of IR-AKI occurrence and development together with the activation of STAT3 and JNK signaling pathways.     

玉米籽粒性状、品质性状和种子萌发特性的粒位效应

玉米雌穗小花无论是自然授粉还是人工同步授粉,都存在雌穗籽粒发育的粒位效应.本研究以5个玉米自交系和5个杂交种为试验材料,分析不同粒位对籽粒性状、品质性状以及发芽特性的影响.结果表明,同一品种的不同粒位间在百粒重等籽粒性状上存在显著差异,而各粒位的籽粒干物质含量和萌发特性上无显著差异.     

温度和盐度对大泷六线鱼仔鱼存活与生长的影响

研究了温度和盐度变化对大泷六线鱼Hexagrammos otakii Jordan et Starks仔鱼存活与生长的影响.结果表明,大泷六线鱼初孵仔鱼及10日龄仔鱼在温度4～16℃范围内都能存活与生长,存活率均在84％以上,温度为20℃试验组的存活率均低于50％.盐度渐变条件下,盐度10～30范围内存活率都大于90％,在盐度为5及以下时仔鱼的存活率降为0,仔鱼对高盐度的适应能力较差.盐度突变条件下,盐度25和30的试验组仔鱼的存活率都在95％以上,盐度10～20的试验组仔鱼出现不同程度的死亡,存治率可达56％～75％.大泷六线鱼仔鱼的最适生长温度为12～16℃,最适生长盐度为25～30.     

溶藻弧菌HY9901鞭毛蛋白flaB基因的克隆及原核表达

参照GenBank上登录的弧菌鞭毛蛋白flaB基因序列设计引物,PCR扩增溶藻弧菌HY9901株的flaB全长基因,序列分析结果显示该基因为1134bp,编码377个氨基酸。与GenBank中其它弧菌的同源基因序列比对显示,溶藻弧菌flaB基因与副溶血弧菌flaB基因的同源性最高(92%)。将该基因定向克隆到原核表达载体pET-32a(+)中,在大肠杆菌BL21(DE3)中成功表达出带His-tag的融合蛋白,分子量大小与预期一致。优化的表达条件为28℃,0.4mmol/LIPTG浓度诱导10h。用纯化后的融合蛋白免疫SPF级小鼠,制备了多克隆抗体。Western-blotting结果表明鼠抗FlaB血清不仅能与诱导后的重组蛋白发生反应,而且能与天然的溶藻弧菌全菌蛋白发生反应,提示鞭毛蛋白FlaB可能是溶藻弧菌的重要保护性抗原之一,为下一步进行FlaB蛋白免疫原性的研究以及疫苗的制备奠定了基础。     

方斑东风螺吻管水肿病病原菌的初步研究

从患病方斑东风螺(Babylonia areolata)分离到一株致病菌Balo001,运用生理生化方法并结合分子生物学方法对病原菌进行分类鉴定,并对病原菌进行药敏分析及半致死剂量(LD50)测定.结果表明:致病菌Balo001为哈氏弧菌(Vibrio harveyi),它对东风螺的LD50值为6.8×105 CFU/g;该菌对氟哌酸、氟苯尼考、复方新诺明等抗菌药有较高的敏感性.