雾培法根际CO2对马铃薯生长和光合作用的影响

通过汽雾栽培方式对马铃薯根际连续 35d的CO2 处理表明 :温室大气处理 (CO2 380～ 92 0 μL·L-1 O2 2 1% )和室外大气处理 (CO2 380 μL·L-1 O2 2 1% )马铃薯植株的形态特征非常接近 ,其株高、叶面积、根系质量、匍匐茎数量、块茎产量以及生物量均比根际高CO2 处理 (CO2 36 0 0 μL·L-1 O2 2 1% )明显提高 ,叶片的气孔导度和胞间CO2 浓度增加 ,光呼吸速率与CO2 补偿点降低 ,叶片光系统Ⅱ功能改善 ,光合速率提高 ,植株生长发育旺盛 ,块茎产量增加 ,说明合适的根际CO2 浓度 (CO2 380～ 92 0 μL·L-1 O22 1% )可能是汽雾栽培马铃薯植株生长旺盛的重要原因     

外源乙烯对草莓果实微粒体Ca2+- ATPase活性和膜脂过氧化的调节

 以乳白期‘春星’草莓(Fragaria ananassa Duch．‘Chunxing’)果实为试材，研究了经钙调素(CaM)拮抗剂三氟拉嗪(TFP)、氯丙嗪(CPZ)各100 µmol·L^-1 和钙通道阻塞剂异博定(Verapamil)100 µmol·L^-1 预处理后再用乙烯(50 µL·L^-1 )处理的草莓果实中微粒体“Ca²⁺-ATP酶活性、O₂ 产生速率和MDA含量的变化。结果表明，外源乙烯对微粒体膜O₂ 产生速率无显著影响，处理早期提高微粒体膜Ca²⁺- ATPase总活性，对MDA含量影响不大；后期加速微粒体膜Ca²⁺- ATPase总活性下降，但仍保持较高的MDA含量和线粒体膜Ca²⁺-ATPase活性。CPZ、TFP和Verapamil预处理降低了上述乙烯处理下Ca²⁺- ATPase活性和MDA含量，但对微粒体膜O 产生速率亦无显著影响，这说明细胞内Ca²⁺-和CaM 可能参与了乙烯诱导的膜Ca²⁺-ATP酶活性与膜脂过氧化水平的调节。     

苹果矮化砧木‘辽砧2号’选育

从1135系的助列涅特与M9杂交实生苗中选出优良苹果矮化砧木—辽砧2号(原代号80-1-6),经过22年田间观查和区试鉴定,其矮化性、早果性、丰产性、生根性与M26相近,适应性强于M26,以其为中间砧的富士树栽后6年进入盛果期,平均株产为23.5kg,同龄M26为17.2kg;8年生树冠积为4.07m3,同龄M26为4.58m3,树体存活率较M26高55%,平均每666.7m2产量1000kg以上;与基砧山定子和生产上主栽的富士系、元帅系、国光系等品种亲和性良好,以自根砧和中间砧方式利用均可。     

Human interleukin-1β induces A375-S2 human melanoma apoptosis through caspase pathway

AIM: To study the molecular biological mechanism and signal transduction pathway of interleukin-1β (IL-1β)-induced apoptosis in A375-S2 melanoma cells. METHODS: Photomicrocropy showed typical apoptotic changes. The cytotoxic effect of IL-1β in vitro and influences of caspases in this effect were measured by MTT assay. The cytotoxicity of cells was assessed by LDH-based assay. Degradation of DNA was detected by agarose gel electrophoresis. RESULTS: The inhibitory effect of IL-1β on A375-S2 cell growth was in a dose and time-dependent manner, and cell death rate reached more than 90% at 72 h after treatment with 10^-9mol/L IL-1β. The inhibitors of caspase-family, -1, -3, -8, -9, and -10, partially blocked cell death at early stage. LDH assay showed that major IL-1β-induced cell death was apoptosis, and in a dose and time-dependent manner. Typical apoptotic DNA ladder was observed in agarose gel electrophoresis. CONCLUSION: IL-1β induced apoptosis in melanoma A375-S2 cells by activating caspase pathway.     

Changes of Ca2＋ activated potassium channels and cellular-proliferation in autogenous vein grafts

AIM: To investigate changes of Ca^2＋ activated potassium channels (K_Ca) in autogenous vein grafts. METHODS: The contraction of venous ring was measured by means of perfusion in vitro. The intimal proliferation and proliferation of cultured smooth muscle cells (vascular smooth muscle cells, VSMCs) were observed by the means of computerised image analysis and MTT method, respectively. Furthermore, whole cell mode of patch clamp was used to record K_Ca of VSMCs isolated from autogenous vein grafts. RESULTS: 1 week after transplantation there were no significant differences of contraction and intimal relative thickness between autogenous vein grafts and control. Contraction and intimal relative thickness of autogenous vein graft were significantly increased 2 weeks after transplantation (P＜0.05, n=8 vs control), and they were more enhanced 4 weeks after vein transplantation (P＜0.01, n=8 vs control). TEA (blocker of Ca^2＋ activated potassium channels) increased MTT A₄₉₀ value of VSMCs from femoral vein in a dose-dependent manner (P＜0.05, n=8). K_Ca current density was significantly attenuated in VSMCs from autogenous vein grafts 1-4 weeks after transplantation (P＜0.05, n=5). CONCLUSION: K_Ca was inhibited in autogenous vein graft, which accounted for vasospasm and intimal proliferation.     

Effect of indomethacin on tumor invasion in human laryngeal cancer Hep-2 cells

AIM: To assess the effect of indomethacin on tumor invasion in a human laryngeal cancer Hep-2 cell line in vitro. METHODS: Hep-2 cells were exposed to indomethacin at different concentrations for 48 h. Then cell growth rate, the colony formation in soft agar medium and cell mobility were examined, and monolayer invasion assay was performed to assess cell invasion index. RESULTS: Preteatment with indomethacin inhibited the colony formation of Hep-2 cells and the cell mobility, and decreased the invasion index. CONCLUSION: Indomethacin can inhibit the invasion of Hep-2 cells.     

Effects of NF-κB decoy oligonucleotides on apoptosis in lung cancer cell A549

AIM: To investigate the effects of NF-κB decoy oligodeoxynucleotides (ODNs) on apoptosis in lung cancer cell A549. METHODS: The treatments of lung cancer cells (A549) were divided into three groups: group A (control group); group B (decoy ODN group) and group C (scramble decoy ODN group). FITC-labeled NF-κB decoy ODNs was transfected into A549 with LipofectAMINE^TM2000. The activation was observed by electrophoretic mobility shift assays (EMSA). The proliferation was observed by growth curve. The apoptosis of cells were observed by flow cytometry and TdT mediated dUTP-biotin Nick End Labeling (TUNEL). The expression of Bcl-2 and Fas were observed by Western blot. RESULTS: After FITC-labeled decoy ODNs was transfected for 1 hour, the decoy ODNs was detected in the nuclei of A549 cells. EMSA performed the depression of the NF-κB binding to the nucleus. The growth curve showed the inhibition of the A549 cell growth and the percentage of apoptosis was increased compare with control group by flow cytometry and TUNEL. The amount of apoptosis inhibitor (Bcl-2) in group A and group C were 2.0 times and 2.1 times more than that in group B, respectively. The level of apoptosis accelerator (Fas) in group B were 2.6 times and 2.3 times more than that in group A and group C, respectively via Western blot. CONCLUSION: The NF-κB decoy ODNs accelerate the apoptosis of lung cancer cell A549 and the mechanism may be due to its inhibiting the expression of Bcl-2 and increasing the level of Fas.     

蛋鸡血浆VLDL浓度二世代双向选择对体脂沉积的影响

以雅发褐壳蛋鸡为素材,在零世代和一世代双向选择的基础上,应用血浆极低密度脂蛋白(VLDL)浓度对体腹脂性状继续进行双向选择,比较了高低脂系间体组成的差异,并研究了中后期血浆VLDL浓度与上述性状的相关程度,进一步探讨了血浆VLDL浓度的选择效应。结果表明:二世代母鸡中后期高脂系体重较高(P<0.05),血浆VLDL浓度与体重呈极显著的表型相关(P<0.01)和中等程度的正遗传相关。62周龄高脂系的腹脂率显著高于低脂系(P<0.05),说明运用血浆VLDL浓度经过二个世代的双向选择,使产蛋鸡中后期体重降低,且对腹脂沉积产生了一定的影响。     

鹅细小病毒VP2基因在大肠杆菌中的表达及纯化

将鹅细小病毒 (GPV) VP2基因插入原核表达载体 p PROEX- HTb,获得重组表达质粒 p PROEX- HTb- VP2。将其转化大肠杆菌 DH5α,用 IPTG诱导表达 ,表达菌体蛋白中可产生与预期大小相符的约 72 0 0 0的蛋白。以光密度扫描对该表达产物进行定量分析 ,表达产物约占菌体总蛋白的 14 %。经 His- tag金属螯合层析纯化 ,获得纯度较高的 6 His- VP2融合蛋白。 Western- blot结果表明 ,所得蛋白与鹅抗 GPV高免血清有较好的免疫反应性 ,说明在 VP2的 N端融合 6个组氨酸不影响其与特异抗体结合的活性。     

猪瘟病毒E2(gp55)基因在昆虫细胞中的表达

将除去3'端跨膜区的猪瘟病毒E2基因亚克隆到杆状病毒转移载体pFastBacHTb,获得重组质粒pFBHT-E2,转化进含穿梭载体Bacmid的感受态细胞DH10Bac,发生转座作用,经抗性及蓝白斑筛选得到含E2基因的重组载体质粒rBacmid-E2,以脂质体介导的方法将此重组载体质粒转染sf9昆虫细胞,获得重组病毒,命名为rvBac-E2.经SDS-PAGE和Western-blot及ELISA等方法检测,结果表明,此E2基因在昆虫细胞中正确表达,表达的蛋白能与猪瘟阳性血清发生特异性反应.