Generalized Shifts on Cartesian Products

It is proved that if E, F are infinite dimensional strictly convex Banach spaces totally incomparable in a restricted sense, then the Cartesian product E×F with the sum or sup norm does not admit a forward shift. As a corollary it is deduced that there are no backward or forward shifts on the Cartesian product`p1×`p2,1\u3c p16=p2\u3c∞, with the supremum norm thus settling a problem left open in Rajagopalan and Sundaresan in J. Analysis 7 (1999(, 75-81 and also a problem stated as unsolved in Rassias and Sundaresan

Alterations of firing activity of the ventromedial thalamic nucleus in rats with unilateral 6⁃OHDA lesions

目的 研究6-羟基多巴胺（6-OHDA）单侧帕金森病模型大鼠的丘脑腹内侧核神经元的放电活动。方法 使用大鼠脑立体定位仪把记录电极尖端置入SD大鼠双侧的丘脑腹内侧核，把用于后期注射6-OHDA的不锈钢管一端置入右侧内侧前脑束的上方。向右侧内侧前脑束内注入12&mu;g/4&mu;L的6-OHDA制作单侧帕金森病大鼠模型。采用神经元单位放电在体多通道同步记录方法记录模型建立前和模型建立后的双侧丘脑腹内侧核神经元的动作电位。应用酪氨酸羟化酶免疫组织化学染色观察黑质内多巴胺能神经元的丧失情况。应用甲酚紫染色对记录电极尖端进行定位。结果 模型大鼠的左侧和右侧丘脑腹内侧核神经元的平均放电频率分别是（15.528 7&plusmn;0.572 69）Hz和（5.698 1&plusmn;0.279 1）Hz，两者的差异有统计学意义（t=15.431,P</p

丘脑腹内侧核高频电刺激改善帕金森病模型大鼠前肢使用不对称行为的研究

目的探讨丘脑腹内侧核高频电刺激能否改善帕金森病模型大鼠前肢使用不对称行为。方法将33只SD大鼠随机分为实验组22只和对照组11只。利用立体定向的方法将刺激电极埋入右侧丘脑腹内侧核,用于注射6-羟基多巴胺的套管埋入右侧内侧前脑束。实验组大鼠右侧内侧前脑束内注射12&mu;g的6-OHDA,对照组注射相同体积的生理盐水。对造模前、造模后和给予DBS时的大鼠进行前肢使用不对称测试。黑质酪氨酸羟化酶免疫组化染色检测黑质多巴胺能神经元毁损程度。尼氏染色确定刺激电极尖端位置。结果从22只大鼠中获得了15只成功的PD大鼠模型。与毁损前相比,模型大鼠毁损后的不对称指数显著增大(P=0.000)。给予高频VM-DBS后,不对称指数显著下降,与毁损后未给予VM-DBS时比较,差异有统计学意义(P=0.009);而与毁损前相比,差异不显著(P=0.214)。给予低频VM-DBS后,不对称指数无明显改变,与毁损后未给予VM-DBS时比较,差异无统计学意义(P=0.4);而与毁损前相比,差异显著(P=0.036)。结论丘脑腹内侧核高频电刺激能够改善6-羟基多巴胺偏侧帕金森病模型大鼠的前肢使用不对称行为,丘脑腹内侧核可能是帕金森病深部脑刺激治疗的潜在有效靶核团。</p

High一frequency stimulation of the subthalamic nucleus ning behavior in hemiparkinsonian rats

目的探讨丘脑底核(subthalamic nucleus,STN)深部脑刺激(deep brain stimulation,DBS)能否改善6-羟基多巴胺偏侧帕金森病模型大鼠自发跑轮行为。方法将35只Sprague-Dawley(SD)大鼠随机分为实验组24只和对照组11只。利用立体定向的方法将刺激电极埋入右侧丘脑底核。实验组大鼠右侧内侧前脑束内注射12&mu;g 6-OHDA,对照组注射相同体积的生理盐水。对造模前、造模后和给予电刺激时的大鼠进行前肢使用不对称测试和自发跑轮行为测试。酪氨酸羟化酶免疫组化染色检测黑质多巴胺能神经元毁损程度。苏木素-伊红染色确定刺激电极尖端位置。结果从24只大鼠中获得了17只成功的PD大鼠模型。前肢使用不对称测试:与毁损后未给予STN-DBS时比较,电极尖端位于STN内的成功模型大鼠给予STN-DBS后,不对称指数显著下降(P=0.038),而与毁损前相比,差异不显著(P=0.07)。跑轮行为测试:与毁损后未给予STN-DBS时比较,电极尖端位于STN内的成功模型大鼠给予STN-DBS后,跑动次数(P=0.032)、跑动距离(P=0.03)和平均峰速度均(P=0.035)显著增加,而从跑动开始到峰速度的平均时间显著减小(P=0.001)。这些指标与毁损前比较,差异均无统计学意义。结论丘脑底核深部脑刺激能够改善6-羟基多巴胺偏侧帕金森病模型大鼠的自发跑轮行为,自发跑轮行为测试在一定程度上可用于筛选抗帕金森病药物或其他治疗方法。</p

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel