Z-Transform The DTFT provides a frequency-domain representation of discrete-time signals and LTI discrete-time systems Because of the convergence condition, in many cases. the DTFT of a sequence may not exist As a result, it is not possible to make use of such frequency-domain characterization in these cases

Branch of discovery science focusing on proteins In 1994 defined as the complete set of proteins that is expressed and modified following expression by the entire genome in the lifetime of a cell. If we look at an organism it means that we are looking at the proteome of 3 trillion of cells and -1000

What is wetland? Areas where water covers the soil Link between water and land water saturation in soil Most fertile and productive ecosystems support both aquatic and terrestrial species tound in every continents except the Antartica Wetland classification Physical hydrological

3.1 Amino Acids 75 acids, covalently linked in characteristic linear sequences 3.2 Peptides and Proteins 85 Because each of these amino acids has a side chain with 3.3 Working with Proteins 89 distinctive chemical properties, this group of 20 pre cursor molecules may be regarded as the alphabet in

This socio-economic growth, together with the rapid expansion of Hong Kong's port and airport facilities and increase in cross boundary traffic, have placed tremendous demands on transport

The State of the HK Economy The Hong Kong economy staged a sharp rebound over the course of 1999, recovering robustly from the severe setback brought about by the earlier Asian financial turmoil. The recovery was strongly export-led. In consequence, there was a marked increase in the combined visible invisible trade surplus over the year

Beating the Averages Paul Graham (This article is based on a talk given at the Franz Developer in Cambridge, MA, on March 25, 2001 In the summer of 1995, my friend rt morris and i started a startup called Viaweb. Our pla to write software that would let end users build online stores. What was novel about this

MTs are hollow, cylindrical structures that occur in nearly every eukaryotic cell that has been scrutinized with EM. MTs have an outer diameter of 24~25nm, a wall thickness of approxim ately 5 nm, and lengths that may extend across the length or breadth of a cell. 1. Tubulin Globular tubulin subunits are arranged in 13 longitudinal row

The Arteries Characteristics Symmetry对称 In the trunk of the bod consist parietal and visceral branches壁支和脏支 Shortest possible course Run on flexor surfaces Usually do not pass directly through muscles, avoiding compression Together with the veins and nerves in a sheath of fascia to form neurovascular bundle 血管神经束

When is a flow compressible? compressible flow differs from an incompressible one in that significant change happens in the density