Flavor, color, and vitamin C retention of pulsed electric field processed orange juice in different packaging materials.

Effects of packaging materials, storage temperature, and time on the stability of pulsed electric field (PEF) processed orange juice were investigated. Single-strength orange juice was treated with PEF at an electric field strength of 35 kV/cm for 59 micros using an integrated pilot plant scale PEF processing and glovebox packaging system. The retention of eight orange juice aroma compounds, color, and vitamin C in glass, polyethylene terephthalate (PET), high-density polyethylene, and low-density polyethylene were evaluated at 4 and 22 degrees C for 112 days. Packaging material had a significant effect (p < or = 0.05) on the retention of orange juice aroma compounds, color, and vitamin C. PEF-treated orange juice had a shelf life of >16 weeks in glass and PET at 4 degrees C.

Effects of pulsed electric field processing and storage on the quality and stability of single-strength orange juice.

The effects of pulsed electric field (PEF) processing on microorganisms in orange juice and on the flavor and color of the juice during storage for 112 days at 4 and 22 degrees C were investigated. Single-strength orange juice was PEF processed at an electric field strength of 35 kV/cm for 59 micros and placed into sterilized glass bottles in a sanitary glove box. PEF-processed orange juice was microbiologically stable at 4 and 22 degrees C for 112 days. PEF processing resulted in significant increases in the hydrocarbons D-limonene, alpha-pinene, myrecene, and valencene (P < or = 0.05) but did not have any effect on octanal, decanal, ethyl butyrate, and linalool. The levels of hydrocarbon compounds did not change at 4 and 22 degrees C in 112 days. Octanal, decanal, ethyl butyrate, and linalool levels significantly decreased in 14 days at 4 degrees C and in 2 days at 22 degrees C. The decrease in these compounds did not have a significant effect on the sensory quality of the orange juice (P > or = 0.05). The microorganisms in PEF-processed orange juice, along with the flavor and color of the juice, remained stable at 4 degrees C for 112 days.

[Importance of classifying beta hemolytic Streptococci and comparison of various tests used for the classification]. / Beta hemolitik streptokok gruplandirmasinin önemi ve gruplamada kullanilan çesitli testlerin karsilastirilmasi.

We grouped hundred beta hemolytic streptococci, isolated from several clinical specimens with precipitation, coagglutination test and biochemical properties. Among the hundred isolates, 64 percent belonged to group A, 19 percent to group B. 3 percent to group C, 2 percent to group D and 12 percent to group G with the precipitation test. The positive correlation between biochemical and precipitation tests was determined to be 91 percent, where as 99 percent of the strains were correctly identified with the coagglutination test. It is important to group Streptococci, from the epidemiological and clinical aspects, with a rapid and reliable method, chosen due to laboratory feasibilities.

[Distribution of beta-hemolytic Streptococcus groups according to clinical sources and age group]. / Beta hemolitik streptokok gruplarinin, klinik örnek ve yas gruplarina göre dagilimi.

Distribution of beta haemolytic streptococcus groups was investigated according to their clinical sources and patients' age groups. The major portion of the isolates from the respiratory tract specimens and pus was group A, and from the urine samples and vagina swabs was groups B and G. In the pediatric age group, percentages of groups A and C were found to be higher than those of the adolescents while the rates of groups B, D and G were elevated in the adolescents. These colonization sites and the age group distribution differences between Streptococcus groups have clinical and epidemiological importance.

[A cerebellar abscess caused by anaerobic and aerobic (mixed) microorganisms]. / Anaerob ve aerob (mikst) mikroorganizmalaria meydana gelen serebellar abse.

A 15 year old boy was admitted to hospital with five days history of fever, headache, vomiting and otorrhea. Findings on physical examination included high fever, purulent drainage from right ear, nuchal rigidity, Brudzinski's and Kernig's signs. Laboratory finding was polymorphonuclear leukocytosis. Computerized tomography (CT) of his brain was normal. A lumbar puncture disclosed purulent CSF. Chloramphenicol and Penicillin G were given intravenously as treatment for the meningitis. After five days of this therapy he continued to be febrile and nuchal rigidity, Brudzinski's and Kerning's signs increased. The second CT demonstrated the presence of an abscess in the cerebellum. The abscess was aspirated during mastoidectomy. In the cultures of the aspiration material Bacteroides species and gram positive micrococci grew out. Metronidazole, 500 mg qid per oral, was added to the therapy. During treatment, his condition was evaluated with serial computerized tomography scans of his brain and these studies showed progressive decrease in the size of the lesion. Metronidazole and antibiotics therapies were continued 45 days. The patient made an uneventful recovery.