A novel generation of retroviral gene-trap vectors has been developed with the ability to induce conditional mutations in most genes expressed in mouse embryonic stem (ES) cells. The vectors rely on directional site-specific recombination systems, which can repair and re-induce the gene-trap mutations when activated in succession. After the gene-trap insertions are passaged into mice, this syst...

in order to determine reaction of sandflies to the light trap, they were collected from the foci of visceral leishmaniasis in meshkjn shahr and germj during 1994. we used three c.d.c. light trap for collection of sandflies. totally, two hundred and sixty three sand - flies were captured from meshkin - shahr focus, belonging to the species of phiebotomus kandejajcj (69.58%), ph.ba/canicus(815%) ...

Rotary screw traps are used in rivers throughout the west coast of North America to capture emigrating juvenile salmonids. Calibrating the capture efficiency of each trap is essential for valid estimates of fish passage. We released PIT-tagged Oncorhynchus mykiss upstream of a rotary screw trap in the South Fork John Day River, Oregon, to estimate capture efficiency. We used three strategies fo...

Efficiently controlling the trapping process, especially the trapping efficiency, is central in the study of trap problem in complex systems, since it is a fundamental mechanism for diverse other dynamic processes. Thus, it is of theoretical and practical significance to study the control technique for trapping problem. In this paper, we study the trapping problem in a family of proposed direct...

The charge transfer efficiency of a CCD is based on the average level of signal lost per pixel over a number of transfers. This value can be used to directly compare the relative performances of different structures, increases in radiation damage or to quantify improvements in operating parameters. This number does not however give sufficient detail to mitigate for the actual signal loss/defere...