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study was conducted to examine the nutritional content, contamination levels,
and biological effects of 3 local prepared formulas. Formula (1) contained
mixed nuts; formula (2) contained moghat, honey and royal jelly, while formula (3)
contained honey, fenugreek and royal jelly. Groups of albino rats (90 rats)
were randomly allocated to diets of control group or 1 - 3 treatment groups.
The tested diets contained 15% carbohydrate. The weight and food intake were
recorded. Blood tests were conducted to determine total cholesterol,
low-density lipoprotein cholesterol, high-density lipoprotein cholesterol,
triglycerides, glucose, urea, creatinine, white blood cell count (WBC), red
blood cell count (RBC), haemoglobin (HB), mean corpuscular volume (MCV), and haematocrit
(HCT). Results showed that bacterial contamination was found in formula (1) and
formula (3). Fungal contamination was detected in formula (2) and formula (3).
Body weight increased significantly in the rats fed treatment formulas compared
to the control group. The blood tests indicated significant increases in the
levels of glucose, WBC, HCT, total cholesterol, LDL cholesterol, and triglycerides
as well as a significant decrease in HDL level in the group (2) was fed formula
(1) the control. In conclusion, these findings indicate that these local
formulas may not be safe, and further studies are required to understand the
consequences of a long-term consumption of these formulas.
The Buck converter with LC input filter operating in
discontinuous output current mode has a high power factor with a constant duty
cycle. A Buck converter in this operation mode can reduce the reverse recovery
loss of the freewheeling diode thus increase the efficiency. The operation,
power factor analysis and modeling of the converter are studied in this paper.
Experimental results are presented to verify the theoretical predictions.