Infrared renormalons and single meson production in proton-proton collisions

In this article, we investigate the contribution of the higher twist Feynman diagrams to the large-$p_T$ inclusive pion production cross section in proton-proton collisions and present the general formulae for the higher twist differential cross sections in the case of the running coupling and frozen coupling approaches. The structure of infrared renormalon singularities of the higher twist subprocess cross section and the resummed expression (the Borel sum) for it are found. We compared the resummed higher twist cross sections with the ones obtained in the framework of the frozen coupling approximation and leading twist cross section. We obtain, that ratio $R$ for all values of the transverse momentum $p_{T}$ of the pion identical equivalent to ratio $r$. It is shown that the resummed result depends on the choice of the meson wave functions used in calculation. Phenomenological effects of the obtained results are discussed.Comment: 28 pages, 13 figure

The origin, conditions and mechanism for the formation of alpine-type hyperbasites of the Lesser Caucasus

The problem of hyperbasites origin is one of the widely discussed topics in geology. This is because they often appear when no expected. Their development does not correspond to the general regularities of the geological complexes’ development. Therefore, when problematic instances of hyperbasites appear, discussion is inevitable. This is due to the imperfections of existing concepts, which are not without flaws. The essence of this concept lies in the fact that during the rotation of the Earth around its axis, geodynamic forces are formed. The hyperbasites complex by its nature belongs to deep igneous formations formed at the initial stage of development of volcano-plutonic processes, where the composition of magmatic products was not subject to decomposition. In general, the origin of igneous rocks is associated with deep anomalous processes, which were formed under the influence of geodynamic forces, where decompression of mantle matter occurs, causing a catastrophic increase in the volume of mantle matter, as well as the associated development of volcanoplutonic processes. Hyperbasites are formed both in divergent and convergent zones of the Earth’s crust. The main factor for their formation is high pressure – deep thermodynamic conditions, where there are no favorable thermodynamic conditions for the complete separation of magmatic melts by composition. The emergence of hypermafic rocks on the surface is associated with geotectonic or denudation processes. Denudation processes can expose only those hypermafic formations that are located at the site of formation. These zones include ancient platforms, sheets, terranes, etc., which were cut by deep erosion processes. As for those hyperbasic formations that are classified as alpinotype hyperbasites, they were moved to the structure of the Alps-Himalayan folded zone from the basement with a collision with subsequent geotectonic processes, where they formed in the bed of the Paleotethys Ocean, both in the process of divergence and convergence. The noted pattern of formation and the mechanism of formation of alpine-type hyperbasites clearly corresponds to the patterns of development of geodynamic forces in the face of the Earth, also with natural laws, which are the main factors in the evolution of the Earth’s crust. From the standpoint of KDEZK, the origin, mechanism of formation, as well as the form of distribution of alpinotype hypermafic rocks of the Lesser Caucasus occurred in the Paleotethys bed, under different thermodynamic conditions and at depths. Further, as a result of the collision, it participated in the formation of folded zones of the Lesser Caucasus. Within the Lesser Caucasus, two genetic types of hypermafic rocks are exposed. Some of them correspond to the convergent zone of the Tethys paleocean, while others correspond to divergent zones. In terms of ore content, the most promising are those hypermafic rocks that are genetically related to convergent zones

An effective singular oscillator for Duffin-Kemmer-Petiau particles with a nonminimal vector coupling: a two-fold degeneracy

Scalar and vector bosons in the background of one-dimensional nonminimal vector linear plus inversely linear potentials are explored in a unified way in the context of the Duffin-Kemmer-Petiau theory. The problem is mapped into a Sturm-Liouville problem with an effective singular oscillator. With boundary conditions emerging from the problem, exact bound-state solutions in the spin-0 sector are found in closed form and it is shown that the spectrum exhibits degeneracy. It is shown that, depending on the potential parameters, there may or may not exist bound-state solutions in the spin-1 sector.Comment: 1 figure. arXiv admin note: substantial text overlap with arXiv:1009.159

Comparsion of two different primer sets used for detection of Helicobacter pylori DNA by polymerase chain reaction assay in gastric tissues [Gastrik dokulardaki Helicobacter pylori DNA'sının polimeraz zincir reaksiyonu testi ile tespitinde kullanılan i·ki farklı primer setinin karşılaştırılması]

Objective: Hpylori infection is one of the most common bacterial infections worldwide. Its prevalence has been estimated to range from 40 to 80% and it varies widely by geographic area, age, race, ethnicity, and socioeconomic status. Since culture methods for isolation of H.pylori in gastric biopsy specimens were insensitive, time consuming and cumbersome, molecular methods for detection and typing of H.pylori are gaining importance. Many PCR methods have been developed to detect the organism directly in clinical specimens. The targets of these PCR methods include the 16SrRNA gene, the random chromosome sequence, the 26-kDa species-specific antigen (SSA) gene, the urease A (ureA) gene, and the phosphoglucosamine mutase(glmM) gene, formerly named urease C (ureC) gene. The aim of present study was to compared the sensitivities of two different PCR methods based on ureA and ureC for the detection of H.pylori in gastric biopsy specimens. Material and Methods: In our study, genomic DNA of 220 gastric biopsi samples (110 antral, 110 corpus) were extracted with QIAGEN tissue kit and H.pylori target genes (ure A and ureC) were amplified by PCR. Results: H.pylori ureC and ureA genes were found in 80.5 and 71.8 percent of biopsy samples respectively. Conclusion: It appears that ureC based-PCR is a useful primary tool to detect and is distinguish H. pylori strains from gastric biopsy specimens and it is superior to ureA based-PCR. © 2010 by Türkiye Klinikleri

Determination of the prevalence and genotypes of H-pylori in gastric biopsy specimens from patients with gastroduodenal pathologies

21st International Workshop on Helicobacter and Related Bacteria in Chronic Digestive Inflammation and Gastric Cancer -- SEP 18-20, 2008 -- Riga, LATVIAWOS: 000258404600087

A comparison of culture and GLMM-PCR methods for detecting Helicobacter Pylori in antral and corpus biopsy specimensin patients with gastroduodenal disoders [Gastroduodenal patolojileri olan hastaların antrum ve korpus biyopsi örneklerinde Helicobacter pylori aranmasında kültür ve GLMM-PCR yöntemlerinin karşılaştırılması]

Objective: The difficulty of growing of Helicobacter Pylori (H.pylori) under in vitro conditions decreases sensitivity of diagnostic methods based on bacterial isolation. However, the PCR method targeting glmM (formerly ureC) gene of bacteria was shown as an alternative to culture in many studies. The aim of our study was to compare these two methods, as well as to determine the effect of gastric localization of H.pylori on sensitivity and applicability of these methods. Material and Methods: This study included two antral and two corpus biopsy samples obtained from 231 patients (158 with gastritis and/or gastric ulcer and 73 with duodenal ulcer) without prior treatment for H.pylori. One antral and one corpus sample were cultuvated in modified Columbia agar media containing horse blood (7%) and antibiotics for H.pylori isolation. The other samples were investigated by PCR assay using specific primers for H.pylori glmM gene sequences. Results: H.pylori was detected by culture method in 163 (70.6%) and by glmM-PCR method in 201 (87.0%) of 231 antral biopsy samples (p< 0.001, ?2 test). The numbers of H.pylori-positive corpus samples were found as 97 (42.0%) and 154 (66.7%), respectively (p< 0.001, ?2 test). Assuming glmM-PCR method which have higher positivity on the diagnosis of H.pylori as the gold standard, specificity of culture for both sample groups were 100%, however, its sensitivity was detected as 81.1% for antral samples and 63.0% for corpus samples. Conclusion: Our results indicate that culture method is less sensitive for diagnosis of H.pylori-related gastroduodenal diseases; its sensitivity decreases to 58.4% in corpus biopsy samples obtained from the patients with corpus predominant gastritis and/or gastric ulcer. © 2010 by Türkiye Klinikleri

Genotyping of methicillin resistant Staphylococcus aureus strains causing nosocomial infections by pulsed field gel electrophoresis in Adana Çukurova University Hospital [Adana Çukurova Üniversitesi Hastanesinde hastane İnfeksiyonuna yol açan metisiline dirençli Staphylococcus aureus suşlarının pulsed field jel elektroforezi yöntemi ile genotiplendirilmesi]

Objective: Methicillin resistant Staphylococcus aureus (MRSA) is one of the most important pathogens causing nosocomial infections. Genotyping epidemiologically related MRSA strains is useful in terms of determining the sources of infectious pathogens, potential carriers, ways of spread and enviromental factors and thus preventing and decreasing nosocomial infections. Pulsed field gel electrophoresis (PFGE) is accepted as the gold standard among the molecular methods used for investigation of genotypic relation. In our study, we aimed to genotype MRSA causing nosocomial infections by pulsed field gel electrophoresis. Material and Methods: In the study, genotypic relationship of 46 MRSA isolates that caused nosocomial infections in different clinics of our hospital between 2005 and 2007 were evaluated using PFGE method which genomic DNA cut by Smal enzyme. Isolates with PGFE band profiles resembling to each other 80% and above with Gel Compar II program were accepted as clonally related. Results: Forty two strains out of 46 were found to be closely related and took place in the same major "A" group while four strains were found to be unrelated. All of 12 MRSA strains isolated from reanimation clinic were found to take place in group "A" and 100% resemblance was found in eight of them. Conclusion: A single MRSA genotype was found to dominate and cause nosocomial infections in the three year period according to PFGE analysis results. © 2010 by Türkiye Klinikleri

Association between genetic polymorphisms of interleukin (IL)-1B and IL-1RN genes and H-pylori infection in gastroduodenal disorders

21st International Workshop on Helicobacter and Related Bacteria in Chronic Digestive Inflammation and Gastric Cancer -- SEP 18-20, 2008 -- Riga, LATVIAWOS: 000258404600083

NDM-1 and rmtc-producing klebsiella pneumoniae isolates in Turkey

Background: The resistance of aminoglycosides in strains that produce beta-lactamase can be developed through the multidrug resistant encoding genes carried by common plasmids. Recently, the association between 16S rRNA methyltransferase resistance and beta-lactamase enzymes carried by the same plasmids has drawn increased attention from researchers, particularly the association in aminoglycoside-resistant strains with a minimum inhibitory concentration (MIC) of ? 256 µg/mL. Objectives: We aimed to investigate the co-existence of 16S rRNA methyltransferase and beta-lactamase genes in multidrug resistant (MDR) Klebsiella pneumoniae strains isolated from clinical samples. Methods: We determined the molecular mechanisms of aminoglycoside resistance and its relationship with resistance to carbapenem and beta-lactam group antibiotics in 40 extended-spectrum beta-lactamase (ESBL)-positive carbapenem- and aminoglycoside-resistant K. pneumoniae strains. Multidrug resistant K. pneumoniae was isolated from various clinical samples in the faculty of medicine of Cukurova University, Turkey. First, the resistance of aminoglycoside and beta-lactam antibiotics was phe-notypically investigated using the Kirby-Bauer disk diffusion test, double disk synergy test, and modified Hodge test. The MIC values of aminoglycoside were determined using the agar dilution method. Polymerase chain reaction was performed to detect the carbapenemases, ESBL, and 16S rRNA methyltransferase genes. The results were confirmed by a sequence analysis. Results: Twenty K. pneumoniae strains showed resistance to amikacin, and 40 were resistant to gentamicin. The MIC value was found to be > 512 µg/mL in five amikacin-resistant strains and > 128 µg/mL in 10 gentamicin-resistant isolates. The rmtC gene, a type of 16S rRNA methyltransferase, was amplified in four isolates (MIC amikacin: > 512 µg/mL, gentamicin: > 128 µg/mL). Of these four isolates, three had the blaNDM-1 gene and all contained at least one ESBL gene. Conclusions: This study demonstrated the co-existence of rmtC and blaNDM-1 genes for the first time in Turkey. The spread of this resistant type should be monitored and limited through molecular surveillance. © 2016, Ahvaz Jundishapur University of Medical Sciences

Detection of primary clarithromycin resistance of Helicobacter pylori and association between cagA + status and clinical outcome

PubMedID: 22956464Helicobacter pylori was examined in 110 patients (82 (74.5) with gastritis, 18 (16.4) with duodenitis, six (5.5) with duodenal ulcer and gastroesophageal reflux, and four (3.6 %) with normal) with gastrointestinal problems living in rural area, no history of macrolide use, and detected by culture (71.8) or direct detection from gastric biopsies by PCR (82.7 %). Also, cagA gene was identified using PCR and was found positive in 68/91 (74.7 %) strains. The prevalence of clarithromycin-resistant H. pylori was investigated by two methods including PCR-RFLP (7.7 (A2142G 1.1 and A2143G 6.6 %)) and twofold agar dilution (8.9 %) to detect phenotypic and genotypic status simultaneously. Among all the H. pylori positive patients, eight (8.8 %) isolates were found to be resistant to clarithromycin by at least one of the AD and/or PCR-RFLP methods. H. pylori positive rates were significantly correlated with patients' sex, age, and endoscopic findings (p = 0.040, <0.001 and <0.001, respectively). There were no differences in gender or endoscopic findings related to cagA+ and cagA- patients. The gene of cagA was not significantly helpful in predicting the clinical outcome of H. pylori infection alone. In conclusion, we revealed that there was a low prevalence of primer clarithromycin resistance in patients living in rural area with no history of macrolide use. The prevalence of mutant strains among the macrolide-resistant H. pylori varies even geographically between close provinces. © 2012 Institute of Microbiology, Academy of Sciences of the Czech Republic, v.v.i