[Urgent surgery in colon carcinoma].

Introduction: About 10% of all operations in colon carcinoma are performed in emergency situations because of severe preoperative complications.

Patients And Method: The prospectively collected data of 1496 patients with colon carcinoma treated from 1987 to 2002 at the Department of Surgery of the University of Erlangen were analysed with special interest on postoperative morbidity and long-term prognosis after elective and urgent surgery.

Results: The rate of urgent surgery was 11%.

Direct measurement of the local density of states of a disordered one-dimensional conductor.

One-dimensional electron systems (1DESs) containing two and one occupied subbands are found below the different types of [11;2] steps of the InAs(110) surface. Using low-temperature scanning tunneling spectroscopy, we determined the subband energies, the disorder potential, and the local density of states of these 1DESs. The rather complete knowledge of the 1DES allowed us to compare the measured LDOS with a single-particle calculation.

Real-space observation of drift States in a two-dimensional electron system at high magnetic fields.

The local density of states of the adsorbate-induced two-dimensional electron system is studied in magnetic fields up to B=6 T. Landau quantization is observed and drift states with a width of about the magnetic length are found in agreement with theoretical predictions. At the tails of the Landau levels the states form closed paths indicating localization.

Direct comparison between potential landscape and local density of states in a disordered two-dimensional electron system.

The local density of states (LDOS) of the adsorbate-induced two-dimensional electron system (2DES) on n-InAs(110) is studied by scanning tunneling spectroscopy. In contrast to a similar 3DES, the 2DES LDOS exhibits 20 times stronger corrugations and rather irregular structures. Both results are interpreted as consequences of weak localization.