79 research outputs found
Principal Vertex Operator Representations for Toroidal Lie Algebras
In this paper we present the principal construction of the vertex operator
representation for toroidal Lie algebras.Comment: 29 pages, plain tex, no figure
The Usefulness of Microalgae Compounds for Preventing Biofilm Infections
Biofilms play an important role in infectious diseases.
It has been estimated that most medical infections are due to
bacterial biofilms, and about 60-70% of nosocomial infections
are also caused by the formation of a biofilm. Historically,
microalgae are an important source of bioactive compounds,
having novel structures and potential biological functions that
make them attractive for different industries such as food,
animal feed, aquaculture, cosmetics, and pharmaceutical. Several
studies have described compounds produced by microalgae and
cyanobacteria species with antimicrobial activity. However,
studies on the antibiofilm activity of extracts and/or molecules
produced by these microorganisms are scarce. Quorum-sensing
inhibitor and anti-adherent agents have, among others, been
isolated from microalgae and cyanobacteria species. The use of
tools such as nanotechnology increase their power of action and
can be used for preventing and treating biofilm-related
infections
The Importance Of Student Health Record Books In School To Realize Childrenâs Health
Health services in schools are carried out through collaboration between Com-munity Health Centers (Puskesmas) and School Health Programs (UKS). It is necessary to learn about schools and their readiness in making student health record books for elementary school (SD) students. The aim of the research was to identify the readiness of schools implementing student health records pro-grams. This research was conducted in 3 elementary schools, namely 2 public schools and 1 private school in Surabaya City, with 8 informants. The results of in-depth interviews showed that UKS activities have been carried out in all schools at the elementary school level but have not been optimal. Student health record books that support student health status do not yet exist in all schools. The absence of students at school has not been followed up if the stu-dents do not attend because of illness
Magnetic hydrodynamics with asymmetric stress tensor
In this paper we study equations of magnetic hydrodynamics with a stress
tensor. We interpret this system as the generalized Euler equation associated
with an abelian extension of the Lie algebra of vector fields with a
non-trivial 2-cocycle. We use the Lie algebra approach to prove the energy
conservation law and the conservation of cross-helicity
Transposon insertion in the purL gene induces biofilm depletion in Escherichia coli ATCC 25922
Current Escherichia coli antibiofilm treatments comprise a combination of antibiotics commonly used against planktonic cells, leading to treatment failure. A better understanding of the genes involved in biofilm formation could facilitate the development of efficient and specific new antibiofilm treatments. A total of 2578 E. coli mutants were generated by transposon insertion, of which 536 were analysed in this study. After sequencing, Tn263 mutant, classified as low biofilm-former (LF) compared to the wild-type (wt) strain (ATCC 25922), showed an interruption in the purL gene, involved in the de novo purine biosynthesis pathway. To elucidate the role of purL in biofilm formation, a knockout was generated showing reduced production of curli fibres, leading to an impaired biofilm formation. These conditions were restored by complementation of the strain or addition of exogenous inosine. Proteomic and transcriptional analyses were performed to characterise the differences caused by purL alterations. Thirteen proteins were altered compared to wt. The corresponding genes were analysed by qRT-PCR not only in the Tn263 and wt, but also in clinical strains with different biofilm activity. Overall, this study suggests that purL is essential for biofilm formation in E. coli and can be considered as a potential antibiofilm target
Perbandingan Efektivitas Dekolorisasi Fotokatalitik Metilen Biru dan Metil Jingga menggunakan Semikonduktor ZnO pada Variasi pH
The comparison of photocatalytic decolorization of Methylene Blue and Methyl Orange using ZnO Semiconductor under UV-LED radiation has been studied at varied pH. ZnO have been synthesized using co-precipitation method. The Scanning Electron Microscopy (SEM) result showed that the synthesized ZnO has a hexagonal structure with the particle size range 0.125 to 0.5 ”m. The BET isotherm characterization showed the synthesized ZnO has a specific surface area (SBET), mesoporous volume and micropore volume of 60.20 m2/g, 0.541 cm3/g and 0.02 cm3/g, respectively. The observation of the effect of pH to the photocatalytic activity showed that the highest removal percentage occurred at pH 9 with the value of 95.64% for methylene blue and occurred at pH 3 with the value of 6.236% for methyl orange.
Characterization of CTX-M-14 and CTX-M-15 producing Escherichia coli strains causing neonatal sepsis
Neonatal sepsis is a disease affecting newborns â€1 month of age with clinical symptoms and positive blood cultures. The number of Escherichia coli strains causing neonatal sepsis resistant to the antibiotics used in the treatment is increasing. In this study, two E. coli strains causing sepsis in neonates of mothers infected with an E. coli strain harboring extended spectrum beta-lactamases were characterized. The blaCTX-M-15 and the blaCTX-M-14 genes were found in an IncFIA and nontypeable transferable plasmids, respectively. In addition, these highly virulent strains belonged to ST705 and ST156 clonal groups, respectively. The presence of strains, which are highly virulent and resistant to ampicillin, gentamicin, and cephalosporins, makes a change in empirical treatment necessary as well as an increase in the surveillance of these infections
Pion double charge exchange on 4He
The doubly differential cross sections for the He
reaction were calculated using both a two-nucleon sequential single charge
exchange model and an intranuclear cascade code. Final state interactions
between the two final protons which were the initial neutrons were included in
both methods. At incident pion energies of 240 and 270 MeV the low-energy peak
observed experimentally in the energy spectrum of the final pions can be
understood only if the contribution of pion production is included. The
calculated cross sections are compared with data.Comment: 25 pages, 9 figure
Indications for the Nonexistence of Three-Neutron Resonances near the Physical Region
The pending question of the existence of three-neutron resonances near the
physical energy region is reconsidered. Finite rank neutron-neutron forces are
used in Faddeev equations, which are analytically continued into the unphysical
energy sheet below the positive real energy axis. The trajectories of the
three-neutron S-matrix poles in the states of total angular momenta and parity
J^\pi=1/2 +- and J^\pi= 3/2 +- are traced out as a function of artificial
enhancement factors of the neutron-neutron forces. The final positions of the
S-matrix poles removing the artificial factors are found in all cases to be far
away from the positive real energy axis, which provides a strong indication for
the nonexistence of nearby three-neutron resonances. The pole trajectories
close to the threshold E=0 are also predicted out of auxiliary generated
three-neutron bound state energies using the Pad\'e method and agree very well
with the directly calculated ones.Comment: 20 pages, 7 Postscript figures, fig.1 is corrected, uses relax.st
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