Electrochemical hydrogen storage of aligned multiwalled carbon nanotubes

Hydrogen storage of aligned multi-walled carbon nanotubes (a-MWNTs),non-aligned MWNTs(n-MWNTs) and graphite electrodes are studied by the electro-chemical measurements .The electrodes are prepared by mixing carbon nanotubes (CNTs) copper powder and ptfe binder in a weight ratio of 1:5:3 and compressing the mixture into porous nickel collector,The results show that the electrochemical hydrogen storage capacity of the a-MWNT electrode is up to 1625 mAh/g corresponding to a high hydrogen storage of 5.7 wt% ,which is 10 times that of graphite electrode and is 13 times that of n-MWNT electrode, suggesting that a-MWNTs are promising materials for electrochemical hydrogen storage.     

Cardiac protective role of a novel erythrocyte-derived depressing factor on rats and its Ca^2＋ mechanism

The cardiac protective role of a novel erythro-cyte-derived depressing factor (EDDF) on spontaneous hy-pertensive rats (SHR), calcium overload (CaO) rats and Wistar rats and its mechanism was evaluated. Mean artery pressure (MAP), heart rate (HR) and LVdp/dtmax were measured by physiological recorder. The effect of EDDF on the Ca2+-ATPase activity in myocardial sarcoplasmic reticu-lum (SR) of CaO rats was determined by inorganic phos-phate assay. Calcium transport in myocytes was measured by 45Ca2+ radioactive isotope measurement. The phosphoryla-tion levels of extracellular signal-regulated protein kinases (ERK1/2) in myocardial tissue of SHR and CaO rats were measured by Western blot method. And the ultrastructures of cardiac muscle cells were observed with the transmission electron microscope. The results indicated that EDDF could significantly decrease MAP, HR and LVdp/dtmax in a dose dependent manner (P < 0.05). It seems that the mechanism might relate with activating the Ca2+-APTase, enhancing the uptake and release of Ca2+ from SR (P < 0.05), decreasing the phosphorylation levels of ERK1/2 of myocytes (P < 0.01) and lightening the ultrastructural lesion of cardiac muscle cells. In CaO rats, the Ca2+-ATPase activity decreased clearly com-pared to control (64.99 7.16 vs 94.48 7.68 nmol·min-1 ·mg-1 protein, P < 0.01), while EDDF (100 mg/mL) could significantly increase the activity (87.93 ?9.54 vs 64.99 ?7.16, P < 0.05, n = 7). Both uptake and release rate of Ca2+ (祄ol 45Ca2+/g protein/min) from myocardial SR of CaO rats re-markably decreased compared to control (32.40 ?2.70 and 15.46 ?1.49 vs 61.09 ?10.89 and 25.47 ?4.29, P < 0.05); EDDF (100 mg/mL) could significantly stimulate their activi-ties (50.48 6.76 and 21.76 2.75 vs 32.40 2.70 and 15.46 1.49, P < 0.05). EDDF could evidently down-regulate the phosphorylation of ERK1/2 in myocardial tissue from SHR and CaO rats (P < 0.01), lighten the ultrastructural lesion of cardiac muscle cells of SHR as well. It is concluded that EDDF seems to play protective roles on both structure and function of heart, which closely related with amelioration of Ca2+ transport and inhibition of Ca2+-MAP kinase pathway.     

不同负荷后对高原短跑运动员红细胞和白细胞及分类的影响

通过对短跑运动员血液有形成分变化的测试和分析，证明高原短跑运动员不同负荷训练前后，白细胞及多数分类，红细胞含量明显增加；中性粒细胞含量降低。对于高原短跑训练中负荷控制和医务监督提供实验依据，为高原短跑训练提供一定的生理学参考。     

垦区鲜乳在贮存与运输环节的监管控制

<正>鲜乳的质量直接关系到乳及乳制品的质量与安全,而鲜乳的贮存与运输环节在监管控制中占有非常重要的地位。垦区鲜乳要想从源头上抓好原料奶的质量与卫生安全,需采取有效的监管控制措施。     

白花夏枯草对高原家兔骨髓各级幼红细胞Feret直径的研究

本文应用透射电镜技术对平原移居高原（海拔３９００米）实验家兔骨髓内各级红系细胞电镜照片的费莱特直径（Ｆeret)进行了研究，实验分平原对照组，高原给药及高原对照三个组，实验结果：高原给药组骨髓原红，早、中，晚幼红细胞Ｆeret直径均低于高原对照组，差别有显著性，结果提示白花夏枯草可降低由低氧引起的各级幼红细胞胸体增大，从而降低血液的粘滞性，改善血循环。     

引入青海省乐都县小尾寒羊血钾型多态性的研究

采用火焰光度计法对引入青海省乐都县152只小尾寒羊红细胞钾浓度的多态性特征进行了研究.结果表明：①在红细胞钾浓度位点上存在高血钾（HK）和低血钾（LK）两种表型，以HK为优势表型（占80.26%）；②Kh和K1等位基因频率分别为0.8959和0.1041，以Kh为优势等位基因；③基因杂合度、有效等位基因数和基因纯合度指数分别为0.18651、.2293和0.6269.     

鸡蛋浸泡贮存后的营养成分初报

营养价值是鸡蛋贮存保鲜技术研究和使用的基础。本文使用我们研制的ＡＡＮ 浸泡液对延安附近罗斯鸡产１ｄ、３ｄ 、７ｄ 蛋进行浸泡贮存５ 个月和１０ 个月，贮后营养成分除维生素与贮前相差十分显著（Ｐ＜ ０－０１） 外，其余均相差不大，Ｐ＞ ０－０５ 。且发现，相同蛋龄蛋贮存１０ 个月营养成分与贮前鲜蛋相差大于贮存５ 个月蛋，相同贮存期７ｄ 蛋龄蛋营养成分与贮前鲜蛋相差明显大于１ｄ 和３ｄ 蛋龄蛋。     

未来体坛的基因骗术

科学家于2000年初发出警告说，在未来的奥运比赛中，尽管奥运圣火照常在体育场内燃烧，可许多奥运冠军的成绩已不再是刻苦训练磨砺身体的结果，而是使用基因骗术获取的“光环”。科学家们认为，在不久的将来，如果基因工程技术被滥用，就有可能通过基因结构的改变而创造出“超级运动员”。举重运动员的胳膊和赛跑运动员的大腿会前所未有地鼓胀起来，长跑运动员则拥有无与伦比的耐力。这绝非危言耸听，随着“基因疗法”技术的完善，也许在2008年的奥运会开幕之前，就能成功地开发出将这个标志着体育运动终结的噩梦变成现实的手段。黑白分明的…     

红细胞生成素在急性肾功能衰竭中的变化

该研究经较严密的设计，采用敏感及特异的检测方法——双抗体酶联免疫法测定血清EPO水平。选择原发病不引起贫血，呼吸功能正常的病例作研究，并对中毒性ARF作了专门研究。结果显示，ARF能引起血清EPO下降，随后产生明显的贫血。从而提示，ARF本身的贫血与EPO下降有关，并为EPO治疗ARF贫血提供理论依据。