The fate of cells in the epiblast at prestreak and early primitive streak stages has been studied by injecting horseradish peroxidase (HRP) into single cells in situ of 6.7-day mouse embryos and identifying the labelled descendants at midstreak to neural plate stages after one day of culture. Ectoderm was composed of descendants of epiblast progenitors that had been located in the embryonic axi...

It is believed that ultraviolet (UV) radiation from the sun participated in events related to the chemical evolution and birth of life on the primitive Earth. Although UV radiation would be also a driving force for the biological evolution of life on Earth, life space of the primitive living organisms would be limited in the UV-shielded place such as in the water at an early stage of the evolut...

The layer-by-layer process of additive manufacturing (AM) is known to give rise high thermal gradients in the built body resulting accumulation residual stresses. In current study, a numerical investigation conducted on effect stresses mechanical properties IN718 triply periodic minimal surface (TPMS) lattices fabricated using selective laser melting (SLM) for different relative densities. AM s...

In this paper, we describe the primitive ideal space of the $C^*$-algebra $C^*(mathcal G)$  associated to the ultragraph $mathcal{G}$. We investigate the structure of the closed ideals of the quotient ultragraph $  C^* $-algebra  $C^*left(mathcal G/(H,S)right)$ which contain no nonzero set projections and then we characterize all non gauge-invariant primitive ideals. Our results generalize the ...

From unincubated quail blastoderms, we have excised, caudal marginal zones (caudally from Rauber's sickle), upper layer fragments covering Rauber's sickle or Rauber's sickle fragments alone (as controls), and placed them on the ventral side of the cranial quadrant of unincubated chicken blastoderms. Also, quail Rauber's sickle fragments, all or not associated with quail endophyll, were placed o...

Local descriptors are the ground layer of recognition feature based systems for still images and video. We propose a new framework to explain local descriptors. This framework is based on the descriptors decomposition in three levels: primitive extraction, primitive coding and code aggregation. With this framework, we are able to explain most of the popular descriptors in the literature such as...

Long-term bone marrow cultures support both differentiation and conservation of primitive human hematopoietic progenitors in the absence of exogenous cytokines. It is believed that hematopoiesis in such cultures requires direct contact between hematopoietic progenitors and stroma. In the present study, we demonstrate that primitive progenitors physically separated from the stromal layer by a 0....

This paper examines the stability of vortices in a two-layer ocean on the f -plane. The mean depth h̄1 of the upper layer is assumed to be much smaller than the depth h̄2 of the lower layer. Using the primitive equations, we derive an asymptotic criterion for baroclinic instability of compensated (i.e. confined to the upper layer) vortices. Surprisingly, it coincides exactly with a similar criter...

Routing in Wireless Network is challenging because of the unpredictable behavior of the medium and the proactive effect of interference. All of these factors lead to poor performance in multi-hop wireless mesh networks specially with the conventional routing. In order to exploit all the advantages that the wireless medium offers, new routing metrics must be explored. These metrics should come f...