871 research outputs found
Endothelial nitric oxide synthase gene polymorphisms associated with periodontal diseases in Turkish adults
Endothelial nitric oxide synthase (NOS3) is involved in key steps of immune response. Genetic factors predispose individuals to periodontal disease. This study's aim was to explore the association between NOS3 gene polymorphisms and clinical parameters in patients with periodontal disease. Genomic DNA was obtained from the peripheral blood of 23 subjects with aggressive periodontitis (AgP), 26 with chronic periodontitis (CP), 31 with gingivitis (G) and 50 healthy controls. Probing depth (PD), clinical attachment loss (CAL), plaque index (PI) and gingival index (GI) were recorded as clinical parameters. We genotyped NOS3 polymorphisms using the PCR and/or PCR-RFLP method. Genotype frequencies differed significantly among periodontal diseases and controls for these polymorphisms. A significant association was detected between NOS3 +894 polymorphism and PD and CAL in the CP and AgP patient groups; whereas NOS VNTR analysis detected no associations with clinical parameters in theCP and AgP groups. However, a significant association was detected between the AA genotype and both PI and GI in patients with gingivitis; and a significant association was shown between the BB genotype and PI. The present study shows that two common polymorphisms of the NOS3 gene cluster are significantly associated with the occurrence of periodontal diseases
Lacunary statistical cluster points of sequences
In this note we introduce the concept of a lacunary statistical cluster
(l.s.c.) point and prove some of its properties in finite dimensional
Banach spaces. We develop the method suggested by S. Pehlivan and M.A. Mamedov [20] where it was proved that under some conditions optimal paths have the same unique stationary limit point and stationary cluster point. We also show that the set of l.s.c. points is nonempty and compact
Invariants of Collective Neutrino Oscillations
We consider the flavor evolution of a dense neutrino gas by taking into
account both vacuum oscillations and self interactions of neutrinos. We examine
the system from a many-body perspective as well as from the point of view of an
effective one-body description formulated in terms of the neutrino polarization
vectors. We show that, in the single angle approximation, both the many-body
picture and the effective one-particle picture possess several constants of
motion. We write down these constants of motion explicitly in terms of the
neutrino isospin operators for the many-body case and in terms of the
polarization vectors for the effective one-body case. The existence of these
constants of motion is a direct consequence of the fact that the collective
neutrino oscillation Hamiltonian belongs to the class of Gaudin Hamiltonians.
This class of Hamiltonians also includes the (reduced) BCS pairing Hamiltonian
describing superconductivity. We point out the similarity between the
collective neutrino oscillation Hamiltonian and the BCS pairing Hamiltonian.
The constants of motion manifest the exact solvability of the system. Borrowing
the well established techniques of calculating the exact BCS spectrum, we
present exact eigenstates and eigenvalues of both the many-body and the
effective one-particle Hamiltonians describing the collective neutrino
oscillations. For the effective one-body case, we show that spectral splits of
neutrinos can be understood in terms of the adiabatic evolution of some
quasi-particle degrees of freedom from a high density region where they
coincide with flavor eigenstates to the vacuum where they coincide with mass
eigenstates. We write down the most general consistency equations which should
be satisfied by the effective one-body eigenstates and show that they reduce to
the spectral split consistency equations for the appropriate initial
conditions.Comment: 26 pages with one figure. Published versio
Thalassemia mutations in Gaziantep, Turkey
Ninety-eight postnatal and six prenatal cases of thalassemia were studied by the reverse dot-blot hybridization technique in the city of Gaziantep, Turkey. We found the following mutations: IVS 1.110 (G>A) in 29.1%, IVS 2.1 (G>A) in 12.3%, IVS 1.1 (G>A) in 7.7%, Codon 8 (-AA) in 5.6%, -30 (T>A) in 4.6%, IVS 1.6 (T>C) in 4.6%, Codon 39 (C>T) in 3.6%, Codon 44 (-C) in 3.1%, IVS 2.745 (C>G) in 1.5%, Codon 8/9 (+G) in 2.1%, Codon 36/37 (-T) in 2.1%, IVS 1.5 (G>C) in 2.1%, Codon 22 (7pb del) in 0.5%, Codon 5 (-CT) in 0.5% while 20.9% were undetermined. 54 of the thalassemia patients were homozygotes, 12 were compound heterozygous and 31 were heterozygotes. In one allele of 5 thalassemia patients, - thalassemia mutation (3.7 single gene deletions in 1 patient, anti-3.7 gene triplication in 4 patients) wasdetermined at the same time. Finally, this is the first comprehensive study in this region and percentage of and - globin genes mutation is 2.6 and 79.4%, respectively
Chromium toxicity in Moringa oleifera Lam.
This study investigated the toxic effects of different Cr concentrations (Control, 5, 25 and 50 mg/L) on hydroponically cultivated M. oleifera seedlings. At the end of the application, certain biochemical variations and changes in Cr and nutrient content (K, Zn, Ca, Cu, Fe, Mg and Mn) of the plant roots and shoots were determined. M. oleifera seedlings accumulated high Cr concentrations in roots and shoots. As a result, Cr led to nutrient deficiency by affecting the intake and transportation of the necessary macro and micro elements. Increase in phenolic compound content and non-protein SH groups may indicate that they played a role in Cr toxicity. Furthermore, the increases in H2O2 and MDA levels clearly demonstrated that Cr toxicity induced oxidative stress in M. oleifera cells
Chromium toxicity in Moringa oleifera Lam.
537-543This study investigated the toxic effects of different Cr concentrations (Control, 5, 25 and 50 mg/L) on hydroponically cultivated M. oleifera seedlings. At the end of the application, certain biochemical variations and changes in Cr and nutrient content (K, Zn, Ca, Cu, Fe, Mg and Mn) of the plant roots and shoots were determined. M. oleifera seedlings accumulated high Cr concentrations in roots and shoots. As a result, Cr led to nutrient deficiency by affecting the intake and transportation of the necessary macro and micro elements. Increase in phenolic compound content and non-protein
SH groups may indicate that they played a role in Cr toxicity. Furthermore, the increases in H2O2 and MDA levels clearly demonstrated that Cr toxicity induced oxidative stress in M. oleifera cells
Spectra and Symmetry in Nuclear Pairing
We apply the algebraic Bethe ansatz technique to the nuclear pairing problem
with orbit dependent coupling constants and degenerate single particle energy
levels. We find the exact energies and eigenstates. We show that for a given
shell, there are degeneracies between the states corresponding to less and more
than half full shell. We also provide a technique to solve the equations of
Bethe ansatz.Comment: 15 pages of REVTEX with 2 eps figure
Exactly Solvable Pairing Model Using an Extension of Richardson-Gaudin Approach
We introduce a new class of exactly solvable boson pairing models using the
technique of Richardson and Gaudin. Analytical expressions for all energy
eigenvalues and first few energy eigenstates are given. In addition, another
solution to Gaudin's equation is also mentioned. A relation with the
Calogero-Sutherland model is suggested.Comment: 9 pages of Latex. In the proceedings of Blueprints for the Nucleus:
From First Principles to Collective Motion: A Festschrift in Honor of
Professor Bruce Barrett, Istanbul, Turkey, 17-23 May 200
Interpolation of SUSY quantum mechanics
Interpolation of two adjacent Hamiltonians in SUSY quantum mechanics
, is discussed together
with related operators. For a wide variety of shape-invariant degree one
quantum mechanics and their `discrete' counterparts, the interpolation
Hamiltonian is also shape-invariant, that is it takes the same form as the
original Hamiltonian with shifted coupling constant(s).Comment: 18 page
- …