The symphony of the human genome concludes with a long Gregorian chant of TTAGGG repeats. This monotonous coda represents one of the most complex problems in chromosome biology: the question of how cells distinguish their natural chromosome ends from double-strand breaks elsewhere in the genome. McClintock's classic finding of chromosome breakage-fusion-bridge cycles, first reported by her at o...

Many applications in materials science, life science and process control would benefit from atomic force microscopes (AFM) with higher scan speeds. To achieve this, the performance of many of the AFM components has to be increased. In this work, we focus on the cantilever sensor, the scanning unit and the data acquisition. We manufactured 10 microm wide cantilevers which combine high resonance ...

An accelerometer, based on a microwave sapphire resonator, is under development for application in a compact gravity gradiometer. This gravity gradiometer potentially can be used in space gradiometry, precision navigation, and geodesy. The principle of operation of the accelerometer is based on measurements of classical springproof-mass displacements, which are converted to phase shifts in the ...

The objective of this study was to determine the influence of season on intake by sheep as well as certain selected qualitative characteristics of Panicum maximum (cv Gatton) (Guinea grass) at the mature growing stage. The lower DM content of the spring and summer grass (41.6 and 40.2%) did not hamper DOMI (48.1 and 26.7 W/d), respectively. The N concentration of the spring and summer grass was...

A model of squeeze-film behavior is developed based on Stokes' equations for viscous, compressible isothermal flows. The flow domain is an axisymmetrical, unit cell approximation of a planar, periodic, perforated microstructure. The model is developed for cases when the lubrication approximation cannot be applied. The complex force generated by vibrations of the diaphragm driving the flow has t...

expansion of oilseeds cultivation plays an important role in provision of the required edible oils for a country's population. iran is one of the origins safflower as a drought and salt tolerant crop, and therefore, it can be counted on as a suitable alternative crop for cultivation in marginal areas. the aims followed in the present research were on evaluation and selection of late season...

Multiversioning of objects in an objectbase system provides increased concurrency and enhanced reliability. The last decade has seen proposals for managing transactions in multiversion database systems. A new transaction model, a new correctness criterion, and an architecture that exploit multiple versions in objectbase systems are described in this paper. The architecture contains three main c...

Polar organic compounds and elements were quantified in PM(10) aerosols collected in urban and rural areas of Baoji, an inland city of China, during winter and spring 2008. Concentrations of biomass burning markers and high molecular weight n-alkanoic acids (HMW, >C(22:0)) were heavily increased in winter. In contrast, sugars presented in higher levels in the spring, among which sucrose was the...

0022-1694/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.jhydrol.2009.07.052 * Corresponding author. Present address: ExxonMob Benmar Drive, Houston, TX 77060, United States. Tel.: 392 9294. E-mail addresses: [email protected] (P.J. Moore), jb [email protected] (E.J. Screaton). Information about sources of recharge, distributions of flow paths, and the extent of water–rock reactions in karst ...