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Criteria for the appearance of post-tetanic potentiation of transmission at central synapses in Helix aspersa.

Long-lasting potentiation of inhibitory post-synaptic potentials occurs at 2 identifiable synapses in Helix brain. It appears only after tetanic stimulation and after a minimum of 20 impulses. Its amplitude and duration depends on the number of stimuli.     

Aneuploidy as a consequence of senescence and ovariectomy in the golden hamster (Mesocricetus auratus)

The hypothesis of the preferred X-chromosome loss in elder human females was reevaluated in the golden hamster: early castration of females proved that the increase of aneuploid cells is correlated with the loss of the ovaries. But here, and in old females, aneuploidy consisted of random loss of excess of chromosomes, in no case an X-chromosome.     

Decentralized Bezout Identity and a Parametrization of Decentralized Controllers for Singular Systems

1　 IntroductionConsider a singular decentralized control system of the formEx(t) =Ax(t) ∑Ni=1Biui(t)yi =Cix(t) ,i∈ N ={ 1 ,2 ,… ,N}(1 )where x(t)∈ Rn is the state vector,ui(t)∈ Rmi and yi(t)∈ Rpi are respectively the localcontrol input and measure outputvectors of the ith control channel.The matrix E may besingular,i.e.,rank(E) 相似文献   

Changes in beta-2 adrenergic receptor sensitivity with maturation of erythroid progenitor cells.

Erythroid burst forming units (BFU-E) were much more sensitive to the beta-2 selective adrenergic drug, salbutamol, than erythroid colony forming units (CFU-E) in an in vitro study of erythroid progenitor cells.     

一种互联网拓扑结构局部特征度量修正算法

对互联网拓扑结构局部特性展开研究,针对已有IP定位数据库的异构性和准确率不高造成的特征度量分析存在偏差的问题,提出了一种基于机器学习的修正算法(IPMG).以复杂网络为基础,结合网络测量数据和已有IP定位数据库中的IP地理位置信息,定义了互联网局部拓扑结构的地理度和地理介数这两种新的特征度量;分析了地理度和地理介数分布的幂律特性以及二者与IP地理位置之间的关系;运用机器学习的方法修正了不同IP定位数据库之间存在的分析有偏差的问题,并通过交叉验证和地标验证结合的方法验证了IPMG算法的有效性.实验结果表明:IPMG算法有效修正地理度和地理介数的同时提高了IP定位数据库的准确率.