农产品产业内贸易状况及影响因素的实证研究——山东、广东、浙江三省的比较

山东、广东、浙江为我国农产品进出口贸易的三甲省份。运用产业内贸易的相关分析方法对三省农产品产业内贸易状况进行比较分析，分析表明，尽管三省的静态农产品贸易均表现为显著的产业内贸易形态，各省农产品产业内贸易的动态发展趋势却各不相同。综合各种因素排序，山东的农产品产业内贸易最发达，广东次之，浙江居末。以B指标为因变量进行的影响因素实证分析表明，农业在国民经济中的地位以及农业的科技投入和利用外资状况对农产品产业内贸易发展有重要影响。     

咪唑诱导的人子宫内膜癌细胞HEC-1B空泡化现象研究

咪唑作为一种弱碱性物质,处理动物子宫内膜细胞后,可诱导其产生空泡化现象,进而影响其生殖生理功能。本研究使用人子宫内膜癌细胞HEC-1B作为模型,使用咪唑处理导致细胞空泡化后探讨空泡化产生的生理机制。通过基因芯片分析、荧光定量PCR检测、激光共聚焦显微镜观察等方法进行研究。结果表明:咪唑处理人子宫内膜癌细胞HEC-1B后,空泡型质子泵(V-ATPase)亚基V0D2基因表达量上调。使用荧光定量PCR验证芯片结果,V-ATPase亚基V0D2 mRNA表达量有所上调。对V-ATPase另外一个亚基V1E1基因进行荧光定量PCR,其mRNA表达量也有所上调。使用V-ATPase抑制剂巴弗洛霉素A1和咪唑共同处理人子宫内膜癌细胞HEC-1B后,通过吖啶橙染色,激光共聚焦显微镜观察,咪唑诱导的空泡被显著抑制。上述结果证明了V-ATPase在咪唑诱导的细胞空泡化中的重要作用。     

清髓愈疽丹对血栓闭塞性脉管炎模型大鼠血栓相关因子的影响

通过人工建立血栓闭塞性脉管炎大鼠模型，结合病理学切片结果，利用荧光定量PCR和ELISA方法检测病变组织中的Icam-1、Vcam-1和血清中的血栓素B2（TXB2）、抗内皮细胞抗体（AECA）的含量。结果表明清髓愈疽丹能够通过有效地降低Icam-1、Vcam—1、TXB2、AECA的含量，抑制淋巴细胞、白细胞的浸润和血小板的黏附聚集，阻止血液高凝状态的形成；延缓损伤内皮处免疫复合物的形成，从而减轻痛变部位的炎症与损伤，因此能抑制血栓的形成，对TAO有确实的疗效。     

锌、硼对大白菜农艺性状及品质的影响

在露地栽培条件下,以春秋王大白菜品种为试验材料,研究了叶面喷施不同浓度锌、硼微肥对大白菜生长、产量及品质的影响.研究结果表明.不同浓度锌、硼微肥均能提高VC和可溶性蛋白质的含量,同时降低硝态氮、可溶性糖和游离氨基酸含量;叶面喷施0.3%锌、0.3%硼微量元素肥料时.大白菜植株生长健壮,株型紧凑,单球质量和产量最高,分别...     

Seroprevalence of neutralizing antibodies to human adenovirus type 5, human adenovirus type 26 and chimpanzee adenovirus type 68 in patients with chronic hepatitis B and patients with primary liver cancer

AIM: To investigate the seroprevalence of neutralizing antibodies to human adenovirus type 5 (AdHu5), human adenovirus type 26 (AdHu26) and chimpanzee adenovirus type 68 (AdC68) in the patients with chronic hepatitis B (CHB) and the patients with primary liver cancer (PLC), and to provide guidance for developing safe and effective biotherapy vectors against CHB and PLC. METHODS: The blood samples from 196 patients with CHB and 193 patients with PLC were examined to assess the presence of neutralizing antibodies against AdHu5, AdHu26 and AdC68 by adenovirus neutralization assays. RESULTS: The seroprevalence rates of neutralizing antibodies to AdHu5, AdHu26 and AdC68 in the CHB patients were 84.7%, 58.2% and 39.8%, respectively. Among the patients with PLC, the prevalence rates of neutralizing antibodies were as follows: AdHu5, 75.1%; AdHu26, 66.8%; AdC68, 32.1%. CONCLUSION: The prevalence rates and titers of neutralizing antibodies against AdC68 were the lowest among the 3 adenoviruses. Therefore, AdC68 serves as more suitable biological therapy vectors for CHB and PLC than AdHu5 and AdHu26.     

甘蓝型油菜和甘蓝CRISPR/Cas9编辑效果的快速检测

CRISPR/Cas9系统是目前最常用的基因组定点编辑工具，通过瞬时表达试验提前验证Cas9/sgRNA载体诱导的突变效率，可以提高基因组定点编辑成功的几率，且显著节省费用及时间。本研究开发了一种利用农杆菌介导的操作简单、适用性好、成本低廉的叶片瞬时表达技术，可用于快速检测甘蓝型油菜和甘蓝中CRISPR/Cas9的编辑效果。针对甘蓝型油菜BnaC.WRKY11.a设计了2个靶位点Tgt1（Target 1）和Tgt2（Target 2），并构建了Cas9/sgRNA-Tgt1/2多重突变载体，在甘蓝型油菜叶片中瞬时表达后，2个靶位点都出现突变，突变效率达11.2%～82.2%。针对甘蓝BolPDS3基因设计了1个靶位点Tgt3（Target3），并构建了Cas9/sgRNA-Tgt3敲除载体，在甘蓝叶片瞬时表达后，Tgt3发生了突变，且大部分为碱基缺失突变，缺失的数目为1～18bp不等，同时还存在少量碱基插入以及碱基替换等突变类型。结果表明这种甘蓝型油菜和甘蓝的叶片瞬时表达技术操作简单、适用性好、成本低廉，CRISPR/Cas9的编辑效果快速易检测。     

应用干扰素治疗肝炎研究进展

干扰素联合用药是治疗慢性乙型肝炎和丙型肝炎中最常用的治疗方案,联合用药不但可以提高干扰素的治疗效果,还可减轻干扰素的不良反应.但是,干扰素联合用药也存在着一定问题,如何改善现有的治疗方案和利用基因工程手段寻找新的治疗肝炎药物是此后一段时期该研究领域学者将要面临的新的挑战.     

化学诱变剂EMS对白菜型冬油菜‘陇油7号’形态及生理生化的影响

采用不同体积分数化学诱变剂甲基磺酸乙酯(EMS)处理白菜型冬油菜‘陇油7号’种子,研究其发芽率、成苗率及苗期植株形态特征、叶片和根的超氧化物歧化酶(SOD)活性、过氧化物酶(POD)活性、过氧化氢酶(CAT)活性、可溶性蛋白质质量分数、可溶性糖质量分数的变化。结果表明,EMS对油菜‘陇油7号’发芽率和成苗率的抑制作用随浓度增加而增强,0.6%为半致死量;EMS对油菜的生长发育有一定抑制作用,且抑制作用与浓度呈正相关;用一定体积分数的EMS处理油菜种子其抗逆性有增强趋势。     

反义RNA介导GmFAD2-1B基因沉默增强大豆种子中油酸的高效累积

油酸含量是评价大豆油食用品质和稳定性的重要指标。本研究采用农杆菌介导转化法,将反义GmFAD2-1B基因导入栽培大豆品种,获得油酸含量显著提高的转基因大豆新品系。Southern杂交检测表明,外源GmFAD2-1B基因片段已导入大豆基因组,其插入拷贝数为1~5个。q RT-PCR检测表明,外源GmFAD2-1B主要在大豆种子中表达,并导致种子中内源GmFAD2-1 m RNA表达水平显著降低,而根、茎、叶、花组织中内源GmFAD2-1 m RNA表达水平无显著变化。脂肪酸组分分析表明,12份转基因大豆种子油酸含量为27.38%~80.42%,其中,L40和L72油酸含量分别为68.91%~80.42%和65.98%~80.22%,较对照品种Williams 82(17.8%~22.0%)提高2.65倍以上,亚油酸降低至4.84%~14.55%,饱和脂肪酸降低至10.34%~11.16%,但总脂肪和总蛋白含量与对照品种相比没有显著变化。农艺性状分析表明,转基因大豆在熟期、株高、叶形、花色、结荚高度、百粒重等方面与对照品种也没有显著差异。     

Cloning and Construction of Eukaryotic Expression Vector of Buffalo HSD17B1 Gene

In order to clarify the effect of 17 beta-hydroxysteroid dehydrogenase 1 (HSD17B1) gene on the reproductive performance of buffalo,in this study,buffalo HSD17B1 gene was cloned by 3'-RACE,analyzed by bioinformatics,and studied with eukaryotic vector construction and cell transfection technology.The results showed that the coding region of buffalo HSD17B1 was 954 bp,3'-UTR was 58 bp,encoded 317 amino acids.The buffalo HSD17B1 gene shared 100%,100%,92%,94%,87%,87% and 87% of similar nucleotide sequence with that of Bos taurus,Ovis aries,Sus scrofa,Equusca ballus,Canis lupus,Loxodonta africana and Homo sapiens,respectively.Phylogenetic tree analysis showed that HSD17B1 gene was highly conserved in different species and evolution.HSD17B1 protein was weakly acidic,without signal peptide,located inthe cytoplasmic,and with the presence of type1_17beta-HSD-like_SDR_c,PRK05993,LPOR and FabG domains.The buffalo HSD17B1 eukaryotic expression vector was successfully constructed,after transfected into 293T cell lines,HSD17B1-EGFP fusion protein was detectable.In a word,the success cloning and construction of eukaryotic expression vector of buffalo HSD17B1 gene,provided an important reference for surveying the regulation mechanism of HSD17B1 gene during buffalo folliculogenesis and embryogenesis.