Optical absorption spectra of 0.2-mm filtered seawater samples originating from diverse oceanic and coastal waters were measured with a long pathlength capillary waveguide; results were compared with those of three different laboratory spectrophotometers. The 0.5-m-long 550-mm (inside diameter) aqueous waveguide uses only 120 ml of filtered seawater, making it convenient for use in flow-through...

JOSE M. F. MOURA CAPS, COMPLEXO, INSTITUTO SUPERIOR TECNICO Av. ROVISCO PAlS P—1096 LISBOA CODEX PORTUGAL

Several researchers have proposed spectrophotometric modifications of the Winkler titrimetric method for measuring dissolved oxygen (DO). These modifications, although simple, are not widely used because of concern about accuracy, calibration, and possible sources of interference. Here we show, using natural samples from lakes and rivers as well as samples manipulated in the laboratory, that th...

It is known that cardiovascular complications plays important roles in the development of diabetes mellitus (DM) and platelet dysfunction is one of the key reasons which led to microangiopathy. This study was designed to investigate the mitochondria function changes of platelet in DM rats and DM patients. The results showed that the platelets viability, platelet adenosine triphosphate (ATP) con...

We present a comprehensive study of the effects of third-order dispersion (TOD) on dispersion-managed (DM) solitons. The two main effects of TOD are creation of asymmetry of the DM soliton’s profile and generation of continuum radiation. Considering these two effects, we derive a conservative bound on the magnitude of TOD below which it will not have a significant detrimental effect on DM solit...

presence of maternal diabetes mellitus (dm) during pregnancy has important consequences for both mother and child. to determine maternal and fetal/neonatal complications of gestational dm and compare them with pre-gestational dm, a prospective study was performed in 100 diabetic women delivered in our hospital from january 2001 to april 2002. pregnancy outcome in 27 women with gestational dm an...

The explosive proliferation of battery powered equipment in the past decade has created unique requirements for a voltage regulator that cannot be met by the industry standards like the LM340 or the LM317. These regulators use an NPN Darlington pass transistor (Figure 1), and will be referred to in this document as NPN regulators. The demand for higher performance is being met by the newer low-...