As part of its 100th-anniversary celebration, the Pan American Health Organization has named 12 persons as "Public Health Heroes of the Americas" in recognition of their noteworthy contributions to public health in the Region of the Americas. Over the course of this year, the Revista Panamericana de Salud Pública/Pan American Journal of Public Health will be carrying pieces written by or about ...

this study was performed to determine the effect of injecting selenium into pregnant heifers at the last stage of gestation on the serum se, cu, zn and fe status of the heifers and their calves. fifty holstein heifers were randomly assigned to one of five treatments. four and two weeks before the expected time of calving, the heifers were injected intramuscularly 10 ml (t1), 20 ml (t2), 30 ml (...

The most studied combinatorial optimization problem in transport and logistics is the vehicle routing problem (VRP). The goal of the vehicle routing problem is to nd a set of routes for a eet of vehicles which optimises the objective function (e.g. total distance, routing costs). Every demand needs to be ful lled and vehicle capacities need to be respected. Many solution methods exist for the '...

The Vehicle Routing Problem (VRP) is a class of well-known NP-hard combinatorial optimisation problems. The VRP is concerned with the design of the optimal routes, used by a fleet of identical vehicles stationed at a central depot to serve a set of customers with known demands. In the basic version of the problem, known as a Capacitated VRP (CVRP), only capacity restrictions for vehicles are co...

In the previous paper of this series, the retention characteristics of 4-methyl sterols were investigated with a view for establishing a systematic relationship between the structure of sterols and their gas chromatographic characteristics. The present report deals an extended study on 6methyl sterols prepared from cholesterol. The retention data for five 6-methyl sterols and for their derivati...

Povzetek. Sodobne organizacije se spreminjajo zelo pogosto. Spremembe se poskuša izvesti hitro in učinkovito. Spremembe pogosto vključujejo spremembe IS zaradi njegovega pomena v organizacijah. Odpor do sprememb spada med ključne dejavnike uspeha večjih projektov in programov IT. Obvladovanje odpora ne pomaga organizacijam zgolj izvesti spremembe hitreje in učinkoviteje, temveč je hkrati tudi p...