Effective inhibition of lytic development of bacteriophages λ, P1 and T4 by starvation of their host, <Emphasis Type="Italic">Escherichia coli</Emphasis>

Background  

Bacteriophage infections of bacterial cultures cause serious problems in genetic engineering and biotechnology. They are dangerous not only because of direct effects on the currently infected cultures, i.e. their devastation, but also due to a high probability of spreading the phage progeny throughout a whole laboratory or plant, which causes a real danger for further cultivations. Therefore, a simple method for quick inhibition of phage development after detection of bacterial culture infection should be very useful.     

Vacuolating,lethal, collagenase and clostripain activities of six reference ATCC <Emphasis Type="Italic">Clostridium histolyticum</Emphasis> strains

We have previously demonstrated that C. histolyticum reference strain ATCC 19401 produces not only lethal factor but also hitherto unrecognized vacuolating toxin. The aim of this study was to compare vacuolating and lethal activities of six reference C. histolyticum strains (ATCC 6282, 8034, 17859, 17860, 19401 and 25770) and to determine whether production of vacuolating toxin is strain-dependent and how the amounts of both toxins produced by the same strain are related to each other and also to protease, collagenase and clostripain activities. All strains produced vacuolating and lethal toxins as well as collagenase, clostripain and proteases, but with different yield. Strain ATCC 19401 demonstrated considerable vacuolating and lethal activities and low activity of collagenase, clostripain and proteases. In other strains such relationship was not evident. Positive correlations were observed in collagenase and clostripain activities of all studied C. histolyticum strains (r = 0.71). Positive correlations were detected also in vacuolating activities of studied strains and clostripain (r = 0.62) and collagenase (r = 0.87) production, and this effect was statistically significant (P < 0.05). Negative non-significant correlations were detected: (a) in lethal activities of studied strains and clostripain, or collagenase activities, (b) in vacuolating activities and protease production.     

The efficient synthesis of isotopically labeled peptide-derived Amadori products and their characterization

Protein glycation is often a cause of diabetes-associated complications. The isotopically labeled peptide-derived Amadori products may serve as standards for quantitative determination of the glycated proteins. In this paper, we discussed various approaches to the synthesis of Amadori products labeled selectively with stable isotopes ²H, ¹³C and ¹⁸O.     

Insulin resistance and serum concentrations of ovarian and adrenal androgen in obese women without additional disease and with policystic ovary syndrome

THE AIM: of the present study was to evaluate serum concentrations of adrenal and ovarian androgens and sex hormone-binding globulin in obese women without additional diseases and in obese women with polycystic ovary syndrome with and without insulin resistance. MATERIAL AND METHODS: The study group involved 73 obese women (39 with PCOS--A and 34 obese without additional diseases--B). The serum concentration of glucose and insulin were measured and the study group was divided on the basis of HOMA index into two subgroups: A I-PCO without insulin resistance (n=18, mean age 27.2+/-5.9 yr; BMI 33.2+/-3.5 kg/m2); AII-PCO with insulin resistance (n=21, mean age 27.5+/-7.1 yr; BMI 37.6+/-6.5 kg/m2); B I-obese without insulin resistance (n=8, age 33.5+/-7.5 yr; BMI 35.2+/-4.8 kg/m2); B II-obese with insulin resistance (n=24, age 30.3+/-5.2 yr; BMI 36.4+/-5.8 kg/m2). Body mass and height were measured and body mass index was calculated with formula. Body composition was measured using bioimpedance method. The serum concentrations of FSH, LH, total and free testosterone, androstendione, DHEAS, SHBG and insulin were determined by RIA method and glucose was determined by enzymatic procedure. RESULTS: We observed significantly higher body mass, fat mass and BMI in AII subgroup when compared to AI, BI and BII subgroups. Only serum concentration of free testosterone was significantly higher in AII subgroup when compared to AI subgroup. We observed a positive correlation between serum concentrations of insulin and free testosterone in both groups A and B, moreover we observed positive correlations between serum concentrations of insulin and both DHEAS and LH in group B. CONCLUSIONS: It seems that insulin resistance plays a key role in the development of hyperandrogenism in obese women. However mechanisms leading to hyperandrogenism in PCOS are still unrevealed and seem to be more complex.     

Strains of genus Salmonella isolated from extraintestinal infections

Every year in Poland from tens to more than hundred bacteriologically verified extraintestinal infections caused by Salmonella species have been registered. These unusually located infections have substantially heavy course and in many cases hospitalisation and antibiotic therapy have to be involved. Cases of extraintestinal infections with these Gram-negative rods, which were described in the literature, concerned: pneumonias, lung abscesses and thoracic empyemas, and infections of: blood, bones and joints, wounds, fistulas and urinary tract. The aim of this study was to set extraintestinal Salmonella infections and to analyze a susceptibility of isolated strains to antimicrobial agents. Between 01.07.2002 and 31.12.2004 (30 months) 13 strains of Salmonella genus have been isolated, including 11 S. enteritidis and 2 S. Hadar. In general, with one exception, isolated strains were susceptible to tested antibiotics/chemotherapeutics. ESBL - positive strains were not detected. The tendency of Salmonella strains to cause extraintestinal infections has been noticed. The problem is still escalating, especially in group of patients chronically treated, with immunodeficiency and immunosuppression, after complicated medical procedures, also in the group of small children and aged persons. Therefore, it is necessary to evaluate a susceptibility to antibiotics/chemotherapeutics of every strain from confirmed case of Salmonella extraintestinal infection and it is important to apply a guided therapy.     

Urban and rural differences in mortality and causes of death in historical Poland

The purpose of this paper is to document and interpret urban-rural differences in mortality in the past. To this end, we used data on mortality in Wielkopolska, Poland, in the 19th century and at the beginning of the 20th century. The data on mortality in rural areas (N = 1,173,910 deceased), small towns (N = 573,903 deceased), and Poznań, the capital of the Wielkopolska region (N = 86,352 deceased), were gathered from original Prussian statistical yearbooks (Preussische Statistik). Causes of death were also analyzed (rural areas, N = 449,576 deceased; small towns, N = 238,365 deceased; Poznań, N = 61,512 deceased). Mortality measures such as crude death rate (CDR), infant death rate (IDR), and neonatal and postneonatal death rates were calculated. Life tables were constructed for both stationary and stable population models and measures of the opportunity for natural selection calculated (Crow's index I(m), potential gross reproduction rate R(pot), and biological state index I(bs)). Relative frequencies of leading causes of death were computed. Stratification depending on the place of residence was evident in all mortality measures as well as in the values of the life tables and the measures of the opportunity for natural selection, but it was reverse of what is observed today in developed countries. In Poznań (a large industrial city), the mortality situation was the least favorable. It was caused by large population density, lack of water supply and sewage systems (up to 1896), and bad working conditions. The values of CDR ranged between 26.89-31.46, and IDR between 190.6-280.5. Newborn life expectancy (for a stable population model) was 31.6 years, I(m) = 0.79, R(pot) = 0.85, and I(bs) = 0.47. The most common causes of death were tuberculosis, other diseases of the respiratory and circulatory systems, dysentery and diarrhea, and cancer. These diseases were less common in rural areas, so they had the most favorable values of mortality measures (CDR between 22.87-27.32, IDR between 181.8-219.4, life expectancy of newborn e(0) = 42.12, I(m) = 0.55, R(pot) = 0.93, I(bs) = 0.60). Infectious diseases (other than tuberculosis), frailty at birth, and frailty in old age were the most frequent causes of death in rural areas. Small towns (population <20,000) had a mortality intermediate between city and rural areas.     

Analysis of mercury levels in historical bone material from syphilitic subjects--pilot studies (short report)

The aim of the present work is to study the remains of seven individuals with typical symptoms of tertiary syphilis in terms of mercury content in bones, thereby verifying whether they were subjected to treatment and, if they were, how long their organisms were exposed to toxic mercury fumes. Mercury was used, mainly in the Middle Ages and in the early modern period, as a preventive measure in case of individuals suffering from syphilis, a venereal disease, and also leprosy. Syphilitic patients treated this way should demonstrate increased concentration of mercury in their bones. The skeletons studied in the present work originate from various archaeological sites in southern and north-central Poland. The analyses concerned individuals with diagnosed syphilis as well as healthy individuals who constituted the control group. The analyses were performed by the LA-ICP-MS technique, with the use of laser Nd: YAG, Macro, 266 nm, New Wave, USA, coupled with Spectrometer Elan DRC-e Perkin Elmer, USA. The content analysis of the studied bone material revealed with high probability that the contact method of mercurial treatment was used only in the case of two women from north-central Poland, deceased at the turn of the 15th century at the earliest.