Transferrin-bound Yb2 uptake by U-87 MG cells and effect of Yb on proliferation of the cells

AIM:To investigate the role of transferrin/transferrin receptor system in transferrin-bound Yb₂ (Yb₂Tf) uptake by U-87 MG cells and the effect of transferrin-bound and -free Yb₂ on proliferation of U-87 MG cells.METHODS:Cell culture and ICP-MS measurement of Yb₂.RESULTS:Yb₂Tf uptake by U-87 MG cells increased with the concentrations of Yb₂Tf, and reached saturation as the concentration in the incubation medium was raised to about 2 μmol/L. Also, Yb₂ uptake by the cells increased with increase of the mole ratio (Yb₂: apoTf), reaching a maximum at 1.5 mole ratio. Yb₂Tf in 0.4 μmol/L significantly inhibited proliferation of U-87 MG cells, however, 10 μmol/L Yb³⁺ had no significant effect on proliferation of the cells.CONCLUSION:The uptake of Yb₂ by U-87 MG cells might be mediated by transferrin/transferrin receptor system. Transferrin-bound but not transferrin-free Yb₂ could significantly inhibit proliferation of U-87 MG cells.     

基于纳米复合材料直读显色检测养殖水中的孔雀石绿

为了建立孔雀石绿(MG)快速直读显色检测与半定量方法,本试验基于溶胶-凝胶法首次制备了碘酸钾@二氧化钛纳米复合材料,将其打印在薄层色谱(TLC)条带上隐性孔雀石绿(LMG)的比移值(R_f)处形成自显色区,辅以显色支持液,并结合Iamge J软件对显色后的条带进行分析。针对实际样品检测时,先将MG全量还原成无色的LMG,再进行显色分析。结果表明,显色条带颜色深浅度与MG浓度之间存在明确的线性关系(R²=0.99),即可用肉眼直接判断,实现了养殖水体中MG总量的直读显色半定量检测。该方法的线性范围为2.5~160 μg·L^-1,肉眼识别检出限为1.6 μg·L^-1。同时,液相-质谱法证实显色分析结果具有可靠性。本研究结果为MG快速检测领域提供了新的参考,为研究其他三苯甲烷类染料的直读显色分析提供了理论依据。     

锗-132对奶牛抗氧化系统功能的影响

为了探讨锗 １３２对奶牛抗氧化系统功能的影响，选用２５头奶牛，随机分组，进行３个月的实验，每组５头，共５组：Ⅰ组为对照组；Ⅱ组加锗 １３２；Ⅲ组加锗 １３２、硒；Ⅳ组加锗 １３２、硒、锌；Ⅴ组加锗 １３２、硒、锌、铜。定期采集血样，测定血清中ＧＳＨ Ｐｘ、ＣｕＺｎ ＳＯＤ的活性、ＭＤＡ的含量以及日粮和全血中的Ｇｅ、Ｓｅ、Ｃｕ、Ｚｎ的含量。实验结果表明：加锗组血清ＧＳＨ Ｐｘ、ＣｕＺｎ ＳＯＤ活性显著高于对照组（Ｐ＜００１），血清ＭＤＡ含量显著低于对照组（Ｐ＜００１）。全血锗含量与血清ＧＳＨ Ｐｘ、ＣｕＺｎ ＳＯＤ和均呈显著正相关与血清ＭＤＡ含量呈显著负相关。证实锗 １３２在奶牛体内具有抗氧化、清除自由基的作用；Ⅲ组血清ＧＳＨ Ｐｘ活性高于Ⅱ组，且全血锗与硒含量呈明显正相关（γ＝０１９１７）。表明硒、锗在奶牛体内抗氧化作用方面有一定的协同作用。     

Effects of MG132 on protein expression of SnoN and fibrosis-related indicators in NRK-52E cells after incubated with high concentration of glucose

AIM: To investigate the effects of proteasome inhibitor MG132 on the expression of SnoN in renal tubule epithelial cells incubated in high glucose, and to explore the possible mechanism and function that MG132 reduces or slows down renal tubular interstitial injury after incubated in high glucose. METHODS: The NRK-52E cells were divided into normal control group (NG), high glucose group (HG) and high glucose plus pretreatment with different doses of MG132 group (HG+MG132). The immunofluorescence staining was used to detect the protein expression of E-cadherin and α-smooth muscle actin (α-SMA) in NRK-52E cells under different conditions. The relative protein expression levels of SnoN, Smad ubiquitination regulatory factor 2 (Smurf2), Arkadia, E-cadherin, α-SMA and collagen type Ⅰ(Col-Ⅰ) were detected by Western blotting. RESULTS: Compared with NG group, the expression of E-cadherin and SnoN was decreased (P<0.05), while the expression of α-SMA, Col-Ⅰ, Smurf2 and Arkadia was increased (P<0.05). Compared with HG group, the protein expression of SnoN and E-cadherin was significantly up-regulated in HG+MG132 group (P<0.05), and the protein expression of α-SMA and Col-Ⅰ was significantly down-regulated in a dose-depended manner (P<0.05). However, no effect on the protein expression of Smurf2 and Arkadia was observed. CONCLUSION: MG132 inhibits the degradation of SnoN protein induced by high glucose, thus reducing the renal fibrosis.     

锗—132对肉用雏鸡免疫功能的影响及其临床应用初探 Ⅳ.锗—132在鸡体内代谢动力学的研究

实验用56日龄健康肉用仔鸡66只,随机分为11组,在单剂量灌服锗—132(235mg/Kg·B·W)后,分别经0.25—24hr.,采血以石墨炉原子吸收分光光度法测定血药浓度,研究了B—羧乙基锗倍半氧化物在鸡体内的药代动力学。结果表明:血药浓度—时间曲线符合—室开放模型。主要动力学参数,T_(1/2)Ka=1.5780hr.;T_(1/2)K—室开放模型。主要动力学参数,T_(1/2)Ka=1.578hr.;T_(1/2)K=1.8649hr.;AUC=180.71mg/L.hr.;Cmax=26.7851ug/ml。按单剂量给药参数推算出多剂量给药参数,当τ为12,24小时,R分别为1.0117和1.000;先导剂量约为100mg/kg。     

阜阳主要大豆品种生育期组划分初探

为了阜阳大豆产业的发展和我国不同地区之间相互科学引种以及便于国际交流与合作,同时为大豆育种改良等方面提供理论依据,根据大豆遗传特性和环境之间的相互作用,以美国大豆生育期组标准品种13份为参照、当地主栽品种和新近选育品种等为主要试验材料25份,3次重复。试验结果表明:阜阳大豆熟期组除徐豆16、周豆11和周豆19生育期组是Ⅴ外,其余均属于生育期组Ⅳ。     

鸡败血支原体垂直传播模式及其阻断方法

以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。     

Ge-132诱导鸡体产生外源性IFN的研究

以Ｇｅ－１３２为诱生剂诱生鸡体产生外源性干扰素。将鸡胚成纤维细胞－水泡性口炎病毒作为鸡干扰素（ＩＦＮ）的检测系统,对不同种细胞、不同的细胞浓度、不同的ＩＦＮ诱生剂等诸因素对ＩＦＮ产生的影响进行了比较。试验结果表明：（１）在Ｇｅ－１３２、鸡新城疫病毒（ＮＤＶ－Ｆ）、植物血凝素（ＰＨＡ）、聚肌胞（ｐｌｙ Ｉ：Ｃ）四种诱生剂中,诱生能力差异极显著（Ｐ〈０．０１）,且以Ｇｅ－１３２诱生ＩＦＮ的能力为最强,