Search

The purpose of study is to develop a traditional Endo's growth medium with the view of suppression of swarming of Proteus vulgaris and Proteus mirabilis. The object of study was a commercial dry Endo's growth medium. The inoculation of reference strains of enterobacteria and clinical sample (feces, urine, phlegm) was implemented according the normative documents. It is demonstrated that brining into Endo's growth medium tryptophan and sodium salts of bile acids in a particular ratio of their concentrations suppressed swarming of Proteus vulgaris and Proteus mirabilis. The obtained results demonstrated that application of enhanced Endo's growth medium significantly increases its differential and diagnostic characteristics.

This paper reports on a factor graph simultaneous localization and mapping framework for autonomous underwater vehicle localization based on terrain-aided navigation. The method requires no prior bathymetric map and only assumes that the autonomous underwater vehicle has the ability to sparsely sense the local water column depth, such as with a bottom-looking Doppler velocity log. Since dead-reckoned navigation is accurate in short time windows, the vehicle accumulates several water column depth point clouds—or submaps—during the course of its survey. We propose an xy-alignment procedure between these submaps in order to enforce consistent bathymetric structure over time, and therefore attempt to bound long-term navigation drift. We evaluate the submap alignment method in simulation and present performance results from multiple autonomous underwater vehicle field trials.

The influence of distance between charges, hydrophobic and electronic parameters of aliphatic and aromatic dicarboxylic acids on the complement-inhibiting activity (CIA) has been ascertained using the QSAR method.

O primeiro objetivo desse trabalho é entender quais características estão relacionadas à decisão de mudança para escolas privadas entre alunos que estudavam na rede pública. Os resultados mostram que as variáveis que explicam a migração são as mesmas já encontradas na literatura sobre escolha entre os setores, como nível de renda, escolaridade da mãe e o desempenho acadêmico. Em seguida, utilizando um indicador de nível socioeconômico e a nota dos alunos em testes padronizados, buscou-se analisar a alocação dos alunos entre a rede pública e privada para comparar o resultado com as previsões empíricas do modelo teórico de Epple e Romano (1998). Encontramos que não há uma segmentação tão clara de acordo com a renda e com a habilidade entre as redes. Também, parece haver uma diferença entre as escolas privadas no processo de seleção dos alunos, sendo que as escolas que cobram mensalidades mais caras subsidiariam os alunos com bom desempenho. The first aim of this study is to understand which characteristics are related to the decision to move to private schools among students who used to study in public schools. The main findings are that the variables that explain migration are the same as found in the literature on choice between sectors, such as income level, mother\'s education and academic performance. Using an indicator of socioeconomic status and grade of students on standardized tests, we also analyze the allocation of students between public and private schools and compare the result with the empirical predictions of Epple and Romano (1998) models. We found that there is no clear segmentation according to student´s income and ability on the public and private sector. Also, there seems to be a difference in the private sector in the selection process of the students, where schools that charge higher tuition can subsidize high-achieving students.

Background Fly maggots have been known for centuries to help debride and heal wounds. Maggot therapy was first introduced in the USA in 1931 and was routinely used there until the mid-1940s in over 300 hospitals. With the advent of antimicrobiols, maggot therapy became rare until the early 1990s, when it was re-introduced in the USA, UK, and Israel. The objective of this study was to assess the efficacy of maggot therapy for the treatment of intractable, chronic wounds and ulcers in long-term hospitalized patients in Israel. Methods Twenty-five patients, suffering mostly from chronic leg ulcers and pressure sores in the lower sacral area, were treated in an open study using maggots of the green bottle fly, Phaenicia sericata. The wounds had been present for 1–90 months before maggot therapy was applied. Thirty-five wounds were located on the foot or calf of the patients, one on the thumb, while the pressure sores were on the lower back. Sterile maggots (50–1000) were administered to the wound two to five times weekly and replaced every 1–2 days. Hospitalized patients were treated in five departments of the Hadassah Hospital, two geriatric hospitals, and one outpatient clinic in Jerusalem. The underlying diseases or the causes of the development of wounds were venous stasis (12), paraplegia (5), hemiplegia (2), Birger’s disease (1), lymphostasis (1), thalassemia (1), polycythemia (1), dementia (1), and basal cell carcinoma (1). Subjects were examined daily or every second day until complete debridement of the wound was noted. Results Complete debridement was achieved in 38 wounds (88.4%); in three wounds (7%), the debridement was significant, in one (2.3%) partial, and one wound (2.3%) remained unchanged. In five patients who were referred for amputation of the leg, the extremities was salvaged after maggot therapy. Conclusions Maggot therapy is a relatively rapid and effective treatment, particularly in large necrotic wounds requiring debridement and resistant to conventional treatment and conservative surgical intervention.

Twenty-seven depressed patients and 10 healthy subjects were investigated in the sleep laboratory during two to three consecutive nights. Eleven of the 27 patients demonstrated the “first night effect” (group I) and 11 other patients demonstrated a clear absence of the “first night effect” (group II). Five of the 27 depressed patients were omitted from the study because they did not fit criteria for first night effect. The 10 healthy controls demonstrated a first night effect. In group I, the duration of the first rapid eye movement (REM) sleep episode was increased on the first night and on the second night the REM sleep latency was decreased, whereas REM sleep duration and eye movement (EM) density was increased. The number of the short sleep cycles (less than 40 minutes) was greater in group I versus group II and the percentage of slow-wave sleep (SWS) was also higher in group I. In depressed patients with the “first night effect” the enhanced REM sleep requirement is satisfied not only by an increased REM sleep duration but also by the improved REM sleep quality that is crucial for adaptation. The adaptive role of the increased first REM period and the increased EM density in this period is very limited.

International audience; RNases are currently studied as non-mutagenic alternatives to the harmful DNA-damaging anticancer drugs commonly used in clinical practice. Many mammalian RNases are not potent toxins due to the strong inhibition by ribonuclease inhibitor (RI) presented in the cytoplasm of mammalian cells. Methodology/Principal Findings In search of new effective anticancer RNases we studied the effects of barnase, a ribonuclease from Bacillus amyloliquefaciens, on human cancer cells. We found that barnase is resistant to RI. In MTT cell viability assay, barnase was cytotoxic to human carcinoma cell lines with half-inhibitory concentrations (IC50) ranging from 0.2 to 13 µM and to leukemia cell lines with IC50 values ranging from 2.4 to 82 µM. Also, we characterized the cytotoxic effects of barnase-based immunoRNase scFv 4D5-dibarnase, which consists of two barnase molecules serially fused to the single-chain variable fragment (scFv) of humanized antibody 4D5 that recognizes the extracellular domain of cancer marker HER2. The scFv 4D5-dibarnase specifically bound to HER2-positive cells and was internalized via receptor-mediated endocytosis. The intracellular localization of internalized scFv 4D5-dibarnase was determined by electronic microscopy. The cytotoxic effect of scFv 4D5-dibarnase on HER2-positive human ovarian carcinoma SKOV-3 cells (IC50 = 1.8 nM) was three orders of magnitude greater than that of barnase alone. Both barnase and scFv 4D5-dibarnase induced apoptosis in SKOV-3 cells accompanied by internucleosomal chromatin fragmentation, membrane blebbing, the appearance of phosphatidylserine on the outer leaflet of the plasma membrane, and the activation of caspase-3. Conclusions/Significance These results demonstrate that barnase is a potent toxic agent for targeting to cancer cells.

B cells play an important role in the pathogenesis of both systemic and organ-specific autoimmune diseases. Autoreactive B cells not only produce autoantibodies, but also are capable to efficiently present specific autoantigens to T cells. Furthermore, B cells can secrete proinflammatory cytokines and amplify the vicious process of self-destruction. B cell-directed therapy is a potentially important approach for treatment of various autoimmune diseases. The depletion of B cells by anti-CD20/19 monoclonal antibody Retuximab® used in autoimmune diseases therapy leads to systemic side effects and should be significantly improved. In this study we designed a repertoire of genetically engineered B cell killers that specifically affected one kind of cells carrying a respective B cell receptor. We constructed immunotoxins (ITs), fused with c-myc epitope as a model targeting sequence, based on barnase, Pseudomonas toxin, Shiga-like toxin E.coli and Fc domain of human antibody IgGγ1. C-MYC hybridoma cell line producing anti-c-myc IgG was chosen as a model for targeted cell depletion. C-myc sequence fused with toxins provided addressed delivery of the toxic agent to the target cells. We demonstrated functional activity of designed ITs in vitro and showed recognition of the fusion molecules by antibodies produced by targeted hybridoma. To study specificity of the proposed B cells killing molecules, we tested a set of created ITs ex vivo, using C-MYC and irrelevant hybridoma cell lines. Pseudomonas-containing IT showed one of the highest cytotoxic effects on the model cells, however, possessed promiscuous specificity. Shiga-like toxin construct demonstrated mild both cytotoxicity and specificity. Barnase and Fc-containing ITs revealed excellent balance between their legibility and toxic properties. Moreover, barnase and Fc molecules fused with c-myc epitope were able to selectively deplete c-myc-specific B cells and decrease production of anti-c-myc antibodies in culture of native splenocytes, suggesting their highest therapeutic potential as targeted B cell killing agents.

A method of the isolation and purification of IgAl protease from a culture of Neisseria meningitidis serogroup A has been developed. Three inactivated intermediates of the production of the meningococcal vaccine, a culture liquid, as well as a supernatant and sediment obtained by the precipitation of bacterial cells by cetavlon, served as a starting material. The purity of IgA1 protease was determined by SDS-PAGE. An immunoenzyme assay for determining the IgA1 protease activity has been devised. The yield of the enzyme with a specific activity of 0.5 to 4 million units/mg from 103 g of the cetavlon precipitate (40 l of culture liquid) was about 600 mug. It was shown that IgAl protease isolated from serogroup A meningococcus is capable of protecting experimental animals (mice) infected with meningococcus of serogroup B.

Microbial spectrum and non-specific as well as specific IgA1 protease activity of isolated microorganisms were investigated in gingival liquid of patients with periodontitis. Microorganisms from the gingival liqud of these patients belonged to conditional-pathogenic obligate and facultatively anaerobic bacteria. 24 strains of microorganisms have been identified. Nonspecific proteolytic activity was found in the following microorganisms: Actinomyces israelii, Actinomyces naeslundii, Aerococcus viridans, Bifidobacterium longum, Neisseria subflave, Streptococcus parvulus, Eubacterium alactolyticum, Lactobaccilus catenoforme, Bacillus spp. Specific IgA1-protease activity and lack of proteolytic activity towards IgG was found in Streptococcus acidominimus, Streptococcus hansenii, Streptococcus salivarius, Leptotrychia buccalis, Staphylococcus haemolyticus and Neisseria sicca. No proteolytic activity was found in cultivation medium of Eubacterium alactolyticum (1 strain), Prevotella buccalis, Aerococcus viridans and Streptococcus sanguis.

For determination of protease activity it is possible to use immunoglobulins. Since proteolytic products apparently do not retain substrate antigenic determinants, it is possible to use ELISA methodsfor monitoring for enzymatic process. ELISA determination of functional activity of specific IgA1-protease has been applied not only for detection of this enzyme, but also for measurement of its inhibition constants. Fixed on a micropanel IgG may be used for evaluation of total proteolytic activity. Depending on pH values, it is possible to measure activity of neutral, alkaline and acid proteases. This approach has allowed to estimate total proteolytic activity of neutral proteases of serum. Measurement of a total level of serum pepsinogene activity can have diagnostic importance in gastroenterology, due to decisive contribution of pepsinogen I to the measured activity.

A method is developed for determining the inhibition constants of substances capable of acting on the complement system at the stage of target recognition (immune complexes) by the first component of the complement (and, hence, blocking activation of the classical pathway of the complement). The ability of some drugs to inhibit the binding of subcomponent C1q to a target has been studied. It is shown that some drugs possess a pronounced ability to block the complement activation. The inhibition constants are compared to the therapeutic dozes of drugs. Some of the investigated preparations (suramin, sodium deoxiribonucleate, curcumin, heparin, sulfetron, guttalax, lysozyme) upon administration can present in the blood flow in concentrations capable of blocking the complement. The method is useful in the search for preparations capable of inhibiting the complement and in the study of side effects of medicinal preparations.

The immunoenzyme analysis and the method for the determination of IgG-containing immune complexes, carrying C1q component of the complement, were developed. In human blood sera the functional activity of components C3, complex C1r2s2, the content of C1 inhibitor and complement-activating immune complexes were determined. The comparative analysis of the activity of components C3 and C1r2s2, as well as between the content of C1 inhibitor and the activity of complex C1r2s2 for seropositive and seronegative sera, was made. Pronounced correlation for seropositive sera was observed. In addition, for seropositive sera correlation between an increase in IgG immune complexes and a drop in the functional activity of complex C1r2s2, as well as a drop in the functional activity of complex C1r2s2 and a growth in the titers of IgG antibodies to Chlamydia trachomatis, were established. The decreased functional activity of key complement components, simultaneously with the presence of complement-activating immune complexes and high titers of specific antibodies could be the diagnostic criteria of carrier state.

Methods of analysis of inhibition of complement system in vitro and in vivo have been developed for study of effects of medical drugs on the complement. The first one, ELISA method, for determination of inhibition of the first stage of complement activation includes binding of C1q subcomponent to immunoglobulin. The second method is based on capacity of mink serum to kill mice at the intravenous administration due to the action of mink complement. The effects of heparin, known anticoagulant, and suramin, used for treatment of trypanosomiasis, have been studied using these systems. The inhibition constants of binding suramin and heparin binding evaluated by the first method C1q were 411 +/- 29 micrograms/ml (or 0.287 +/- 0.020 mumole/l) and 36.4 +/- 1.7 micrograms/ml (or 2.28 +/- 0.10 mmole/l), respectively. This indicates that heparin binding with C1q in 10 times is higher, than that for suramin (as weight ratio) or 100 times higher in molar ratio. Administration of 3 mg of suramin or 0.3 mg of heparin to mice protected them against lethal action of intravenously injected 0.08 ml of mink serum. Blood concentrations of these compounds approximately correspond to inhibition constants for C1q binding, obtained using in vitro method.

Fly maggots have been known for centuries to help debride and heal wounds. Maggot therapy was first introduced in the USA in 1931 and was routinely used there until the mid-1940s in over 300 hospitals. With the advent of antimicrobiols, maggot therapy became rare until the early 1990s, when it was re-introduced in the USA, UK, and Israel. The objective of this study was to assess the efficacy of maggot therapy for the treatment of intractable, chronic wounds and ulcers in long-term hospitalized patients in Israel.Twenty-five patients, suffering mostly from chronic leg ulcers and pressure sores in the lower sacral area, were treated in an open study using maggots of the green bottle fly, Phaenicia sericata. The wounds had been present for 1-90 months before maggot therapy was applied. Thirty-five wounds were located on the foot or calf of the patients, one on the thumb, while the pressure sores were on the lower back. Sterile maggots (50-1000) were administered to the wound two to five times weekly and replaced every 1-2 days. Hospitalized patients were treated in five departments of the Hadassah Hospital, two geriatric hospitals, and one outpatient clinic in Jerusalem. The underlying diseases or the causes of the development of wounds were venous stasis (12), paraplegia (5), hemiplegia (2), Birger's disease (1), lymphostasis (1), thalassemia (1), polycythemia (1), dementia (1), and basal cell carcinoma (1). Subjects were examined daily or every second day until complete debridement of the wound was noted.Complete debridement was achieved in 38 wounds (88.4%); in three wounds (7%), the debridement was significant, in one (2.3%) partial, and one wound (2.3%) remained unchanged. In five patients who were referred for amputation of the leg, the extremities was salvaged after maggot therapy.Maggot therapy is a relatively rapid and effective treatment, particularly in large necrotic wounds requiring debridement and resistant to conventional treatment and conservative surgical intervention.