Current-mode sinusoidal oscillators using single FTFN

New current-mode sinusoidal oscillator circuits are presented. The proposed circuits use single four-terminal floating nullor and, at most, eight passive elements. Two of the oscillator circuits use grounded capacitors and enjoy the independent grounded-element control of the frequency of oscillation and the condition of oscillation. Experimental results are include

Current-mode sinusoidal oscillators using single FTFN

New current-mode sinusoidal oscillator circuits are presented. The proposed circuits use single four-terminal floating nullor and, at most, eight passive elements. Two of the oscillator circuits use grounded capacitors and enjoy the independent grounded-element control of the frequency of oscillation and the condition of oscillation. Experimental results are include

Factors Affecting Incidence of Uterine Torsion in Egyptian Buffaloes (Bubalus bubalis) and its Response for Rolling

Objective: The present work was planned to study the incidence of uterine torsion in Egyptian buffaloes as well as its prognosis after mechanical treatment.Methods: A total number of 35 buffaloes of different ages, parities and stage of pregnancy with complain of colic and anorexia were included in the present study. These animals were examined rectally to detect stage of pregnancy, degree, direction, duration, location of uterine torsion. Mechanical handling of torsion cases and prognosis of recovered cases was performed. After birth, sex of new born was also recorded.Results: The torsion of uterus mostly occurred in pleuriparous buffaloes (100%) in right side (85.7%) during second half of pregnancy (100%). Most cases were postcervical (85.7%) during the early stage (7 and 8 months). Torsion also may occur during labour (17.4%) where the cervix was dilated after correction. Most cases of uterine torsion occur in stabled animals for long period (97%). The uterine torsion associated with male calves (65.7%) as well as with large size calves (40-50kg) and majority of the calves were in normal position. The first foetal sac expelled in majority of cases was amniotic sac (97%) with few cases of placental retention. Uterine torsion with short duration (1-6 h) usually needs 1-2 rolls only for correction and usually takes 0-6h (100%) for cervical dilatation. Occurrence of uterine torsion for above three days usually did not respond for rolling.Conclusion: Uterine torsion usually occurs in old stabled animal with good BCS during green season at last month of pregnancy. The right sever and post cervical torsion were the most common type of torsion. Rapid diagnosis of uterine torsion within 6 h usually results in good prognosis even in severe cases

Tracking the Sources of Contamination and Evaluating the Effect of Cooking on Bacterial Load in Meat Meals Prepared and Served in Foodservice Establishments

In this study, we determined the aerobic plate count, Staphylococcus (Staph.) aureus count, and most probable numbers (MPN) of coliforms, fecal coliforms, and Escherichia (E.) coli, and the presence of Listeria monocytogenes in 120 samples of beef steak and beef burger at various stages of preparation in a randomly selected food serving establishment in Beni-Suef City, Egypt. Additionally, 60 swab samples from knives, cutting boards, and operator's hands were investigated for the same bacteriological criteria. Subsequently, bacterial isolates were subjected to molecular identification by investigating the presence of virulence and antibiotic resistance genes. The results showed that 100 % of meat product samples at various stages of preparation contained aerobic bacterial load and Staph. aureus. Conversely, E. coli and L. monocytogenes were undetectable in meat product samples. Interestingly, 13, 7, and 1 out of 20 swab samples from hands contained coliforms, fecal coliforms, and E. coli, respectively, while knives and cutting boards were free from fecal coliforms and E. coli. Furthermore, contamination with Staph. aureus was reported in 100 % of knives and hand swab samples and 50 % of cutting board swab samples. Furthermore, the only E. coli isolate from a worker's hand contained eaeA gene, but not Stx1 gene, which indicates that it is an enteropathogenic E. coli (EPEC) strain. Moreover, 6 and 5 Staph. aureus isolates from operator hands and beef steak after cooking had coa and mecA genes, respectively, which are responsible for plasma coagulation and methicillin resistance, respectively. To sum up, this food serving establishment does not apply proper food safety guidelines, practices inadequate cleaning and sanitizing and poor personal hygiene, accordingly, it should be faced with a high level of concern and consideration by the legal authorities

Is VEGF a predictive biomarker to anti-angiogenic therapy?

Tumor growth and metastasis are dependent on angiogenesis. Inhibiting angiogenesis has therapeutic potentials for treating cancer. Researchers have identified many of the pathways involved in angiogenesis and proposed selective targeted strategies. A high probability of benefit is desirable to justify the choice of anti-angiogenic therapy from an ever-expanding list of expensive new anticancer agents. However, biomarkers of response to anti-angiogenic agents are inconclusive for predicting benefit from these drugs. This paper reviews the most important biomarker of angiogenesis, namely VEGF, in relation to its expression in cancer and the treatment of these cancers through targeting VEGF and its pathways. © 2010 Elsevier Ireland Ltd.SCOPUS: re.jinfo:eu-repo/semantics/publishe