A total of 958 samples of raw fish, fish products and "frutti di mare" were tested for staphylococci. Among 153 strains isolated and subjected to identification the most frequently present were: S. aureus, S. warneri, S. hominis and S. sciuri. These species stated for 46.4; 20.9; 7.2 and 5.2 percent of the total number of identified staphylococci species, respectively. Atypical coagulase-negative S. aureus represented 11.3 percent of identified strains of this species. With coagulase-negative staphylococci taken into account, presence of staphylococci was confirmed in 69.8 percent of the 275 samples tested, while contamination with coagulase-positive staphylococci was confirmed in 24.7 percent of them

Paper described the method of measuring water content in food products, based on microwave heating and drying of the foodstuff samples. Power supplied to material is controlled as a function of sample mass and features, thus the sample is dried in a short time without overheating. Water content is automatically calculated from the mass losses during drying. The experiments conducted with yoghurt confirmed agreement of the results with a reference method

Results of arsenic determinations in 9 fish species from the North-East Atlantic, Szczecin Lagoon and lakes: Dabie, Dlugie and Mysliborskie are presented. Arsenic contents were found to range within 0.00-3.37 microgram per kg. Much higher contents were found in marine than freshwater fishes, what resulted from higher concentrations of the element in seawater

The paper presents lysimeter tests, which have been conducted since 1974 on the amount of water runoff from sodded soil profile under conditions of its diversified use and watering. On the tested area a major portion of the total yearly runoff from grasslands occurs during the growing season due to the amount and distribution of precipitation in this region (c.a. 68 of the total yearly precipitation falls during the growing season). Runoff values from grasslands recorded during the study period varied from 113.7 to 247.1 mm. A significant relationship has been found betwen the amount of water draining away from grassland soil profile and the amount of yield, which was caused either by a method of use (meadow, pasture or 8-15 cm high sward) or by the amount of applied nitrogen fertilization

The issues related to the determination of water content in food products by means of infrared radiation and microwave radiation were discussed in presented work. The advantages and disadvantages of the discussed methods are indicated. In the research part, the accuracy and speed of water content analysis was checked when it is carried out using a moisture analyzer (MA 50.X2.A) based on infrared radiation and when the same products are subject to a moisture analyzer (PMV 50) emitting microwave radiation. The following products: natural yoghurt, milk, vanilla cream cheese, cream cheese with olives and margarine were examined. It was found that the accuracy of the water content analysis in the tested products ranged from 0,01 percent to 0,52 percent when using microwaves and from 0,02 percent to 0,26 percent when the heat source was infrared radiation. The analysis time of the water content was about 3 minutes when using microwavesand about 13 minutes for infrared radiation.

Studies on medium heavy layers Astra S kept in cages were conducted. The decrease by 6 percent of laying performance and the increase of feed conversion in layers given the diet with plant concentrate feeds than in those fed the DJ concentrate mixture was stated. The change in a triglyceride concentration and activity of some enzymes in blood of layers with water deprivation was found