The heart is one of the first organs to function in the developing embryo. Vertebrate heart development can be subdivided into different phases, e.g. specification of myo- and endocardial progenitor cells during the establishment of heart-forming fields within the anterior lateral plate mesoderm, formation of the linear heart tube by merging of the paired heart-forming fields in front of the fo...

The twelfth problem of Hilbert reminds us, although the reminder should be unnecessary, of the blood relationship of three subjects which have since undergone often separate developments. The first of these, the theory of class fields or of abelian extensions of number fields, attained what was pretty much its final form early in this century. The second, the algebraic theory of elliptic curves...

This article focuses on a new organisational form that is emerging in the South African context—knowledge networks of higher education, industry and intermediary partners. The article focuses on seven case studies in two high-technology fields and their related industrial sectors—biotechnology, being relatively new, and new materials development, being relatively mature in South Africa. It show...

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An in vivo animal model of disuse osteopenia was used to determine the osteogenic potential of specific components of electrical fields. The ability of a complex pulsed electrical field to inhibit loss of bone was compared with the remodeling response generated by extremely low-power, low-frequency (fifteen, seventy-five, and 150-hertz) sinusoidal electrical fields. The left ulnae of thirty adu...

Multispectral remote sensing has potential to provide quick and inexpensive information on sugarcane aphid, Melanaphis sacchari (Zehntner), pest status in sorghum fields. We describe a study conducted to determine if injury caused by sugarcane aphid to sorghum plants in fields of grain sorghum could be detected using multispectral remote sensing from a fixed wing aircraft. A study was conducted...

Context. The turbulent pumping effect corresponds to the transport of magnetic flux due to the presence of density and turbulence gradients in convectively unstable layers. In the induction equation it appears as an advective term and for this reason it is expected to be important in the solar and stellar dynamo processes. Aims. In this work, we have explored the effects of the turbulent pumpin...

A frequent challenge encountered in the exploitation of mature gas fields located Getic Depression is sand production. Causes production are mainly related to degree rock consolidation, lithology, increasing water and rates. The effects multiple such us low productivity wells, accumulation into surface equipment, erosion downhole plugging perforation zone casing damage. current paper will addre...

We develop a model of the solar dynamo in which, on the one hand, we follow the Babcock–Leighton approach to include surface processes like the production of poloidal field from the decay of active regions, and, on the other hand, we attempt to develop a mean field theory that can be studied in quantitative detail. One of the main challenges in developing such models is to treat the buoyant ris...

Abstract Laser beam scanning technology has been widely used in various fields such as LIDAR, photoelectric detection and space optical communication, etc. Mechanical problems inflexibility low rate. This paper introduces the basic principles of acoustic-optical scanning, electro-optical phased array MEMS analyses advantages disadvantages several methods main application scenarios, finds that c...