نتایج جستجو برای: primary branching

تعداد نتایج: 668298  

1996
T. L. Myers

The experiments presented here investigate the competing photodissociation pathways for allyl chloride upon excitation of the nominally pp*~CvC! transition at 193 nm. The measured photofragment velocity distributions evidence C–Cl bond fission and HCl elimination. The recoil kinetic energy distribution for the HCl products is bimodal, indicating two primary processes for HCl elimination. The ex...

2014
Sayantanee Biswas Michelle R. Emond Phan Q. Duy Le T. Hao Christine E. Beattie James D. Jontes

The proper assembly of neural circuits during development requires the precise control of axon outgrowth, guidance, and arborization. Although the protocadherin family of cell surface receptors is widely hypothesized to participate in neural circuit assembly, their specific roles in neuronal development remain largely unknown. Here we demonstrate that zebrafish pcdh18b is involved in regulating...

Journal: :Clinical anatomy 2011
Julius A Ogeng'o Wanjiku Njongo Elbusaidy Hemed Moses M Obimbo Jacob Gimongo

Branching pattern of middle cerebral artery influences frequency of its aneurysms, and is of potential value in their surgical repair and diagnosis of stroke. This pattern shows inter-population variations but there is paucity of data from Africans. This study aimed at describing branching pattern among black Kenyans. Middle cerebral arteries numbering 288 from 144 formalin fixed brains obtaine...

2007
Kevin Wang

There are two primary models of temporal data structures. The first, called persistence, is based on the branching-universe model of time travel. In this model, going back in time and making changes creates a new branch of the data structure that differs from the original branch. The second, called retroactivity, works on the idea of round-trip time travel. Here, a time traveller goes back in t...

Journal: :Neuron 2006
David MacLeod Julia Dowman Rachel Hammond Thomas Leete Keiichi Inoue Asa Abeliovich

Mutations in LRRK2 underlie an autosomal-dominant, inherited form of Parkinson's disease (PD) that mimics the clinical features of the common "sporadic" form of PD. The LRRK2 protein includes putative GTPase, protein kinase, WD40 repeat, and leucine-rich repeat (LRR) domains of unknown function. Here we show that PD-associated LRRK2 mutations display disinhibited kinase activity and induce a pr...

2006
Steven P. Lalley

Various stochastic processes on nonamenable graphs and manifolds of exponential volume growth exhibit phases that do not occur in the corresponding processes on amenable graphs. Examples include: (1) branching diffusion and random walk on hyperbolic space, which for intermediate branching rates may survive globally but not locally; (2) contact processes on homogeneous trees, which likewise can ...

1995
NEIL O'CONNELL

We obtain a weak approximation for the reduced family tree in a near-critical Markov branching process when the time interval considered is long; we also extend Yaglom's theorem and the exponential law to this case. These results are then applied to the problem of estimating the age of our most recent common female ancestor, using mitochondria1 DNA sequences taken from a sample of contemporary ...

2013
L. C. J. Heijmans S. Nijdam E. M. van Veldhuizen U. Ebert

We investigate the branching of positive streamers in air and present the first systematic investigation of splitting into more than two branches. We study discharges in 100mbar artificial air that is exposed to voltage pulses of 10 kV applied to a needle electrode 160mm above a grounded plate. By imaging the discharge with two cameras from three angles, we establish that about every 200th bran...

Journal: :Memorias do Instituto Oswaldo Cruz 2005
Miriam Adriana Alvan-Aguilar Neusa Hamada Peter H Adler Sérgio Luiz Bessa Luz

Simulium cauchense Floch & Abonnenc and Simulium quadrifidum Lutz are widely distributed in the Amazon region and are morphologically similar at the larval and pupal stages. Chromosomally, these species are readily distinguished by the position of the nucleolar organizer, which is in the short arm of chromosome I in S. cauchense and in the long arm of chromosomes III in S. quadrifidum. They als...

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