Magnetsko-optička svojstva legure In1−xGaxP

The room-temperature dependence on composition of the energy gap is measured for the ternary alloy system In1−xGaxP semiconductors. The cross-over point from the direct to indirect optical transition energy gap is found at x = 0.718. An empirical relation for the alloy system energy-gap dependence is found for both direct and indirect transition regions. From the empirical relations belonging to the direct region transition, the values of the expected indirect energy transition at Γc1 are calculated. The difference between these values and the corresponding indirect energy (Γc1−Xc1) are also calculated. The change of Eg due to the effects of magnetic field up to 1.6 T (Tesla) was also measured. The magnetic coefficient is found to be between 3.33×10−7 and 3.87×10−7 eV/T for x = 0.31 to x = 1. A clear deviation of the magnetic coefficient occurred for the change from the direct-region to that of the indirect-region transition.Mjerili smo ovisnost energijskog procijepa u trojnom sustavu poluvodičke legure In1−xGaxP na sobnoj temperaturi. Našli smo prijelaznu točku od izravnih k neizravnim optičkim prijelazima za x = 0.718. Izveli smo iskustvenu ovisnost energijske ovisnosti energijskog procijepa tog sustava za izravne i neizravne prijelaze. Na osnovi iskustvene ovisnosti za područje izravnih prijelaza izračunali smo energiju neizravnih prijelaza za Γc1. Izračunali smo također razlike tih vrijednosti koje odgovaraju energiji neizravnih prijelaza (Γc1−Xc1). Promjene Eg zbog učinaka magnetskog polja mjerili smo do 1.6 T. Našli smo magnetski koeficijent između 3.33 × 10−7 i 3.87 × 10−7 eV/T za x = 0.31 do x = 1. Opaža se jasan otklon magnetskog koeficijenta pri prijelazu od izravnih k neizravnim prijelazima

Magnetsko-optička svojstva legure In1−xGaxP

The room-temperature dependence on composition of the energy gap is measured for the ternary alloy system In1−xGaxP semiconductors. The cross-over point from the direct to indirect optical transition energy gap is found at x = 0.718. An empirical relation for the alloy system energy-gap dependence is found for both direct and indirect transition regions. From the empirical relations belonging to the direct region transition, the values of the expected indirect energy transition at Γc1 are calculated. The difference between these values and the corresponding indirect energy (Γc1−Xc1) are also calculated. The change of Eg due to the effects of magnetic field up to 1.6 T (Tesla) was also measured. The magnetic coefficient is found to be between 3.33×10−7 and 3.87×10−7 eV/T for x = 0.31 to x = 1. A clear deviation of the magnetic coefficient occurred for the change from the direct-region to that of the indirect-region transition.Mjerili smo ovisnost energijskog procijepa u trojnom sustavu poluvodičke legure In1−xGaxP na sobnoj temperaturi. Našli smo prijelaznu točku od izravnih k neizravnim optičkim prijelazima za x = 0.718. Izveli smo iskustvenu ovisnost energijske ovisnosti energijskog procijepa tog sustava za izravne i neizravne prijelaze. Na osnovi iskustvene ovisnosti za područje izravnih prijelaza izračunali smo energiju neizravnih prijelaza za Γc1. Izračunali smo također razlike tih vrijednosti koje odgovaraju energiji neizravnih prijelaza (Γc1−Xc1). Promjene Eg zbog učinaka magnetskog polja mjerili smo do 1.6 T. Našli smo magnetski koeficijent između 3.33 × 10−7 i 3.87 × 10−7 eV/T za x = 0.31 do x = 1. Opaža se jasan otklon magnetskog koeficijenta pri prijelazu od izravnih k neizravnim prijelazima

Detecting mode entanglement: The role of coherent states, superselection rules and particle statistics

We discuss the possibility of observing quantum nonlocality using the so-called mode entanglement, analyzing the differences between different types of particles in this context. We first discuss the role of coherent states in such experiments, and we comment on the existence of coherent states in nature. The discussion of coherent states naturally raises questions about the role of particle statistics in this problem. Although the Pauli exclusion principle precludes coherent states with a large number of fermionic particles, we find that a large number of fermionic coherent states, each containing at most one particle, can be used to achieve the same effect as a bosonic coherent state for the purposes of this problem. The discussion of superselection rules arises naturally in this context, because their applicability to a given situation prohibits the use of coherent states. This limitation particularly affects the scenario that we propose for detecting the mode entanglement of fermionic particles.Comment: 7 pages (two-column

CYTOMEGALOVIRUS IgG AND IgM ANTIBODIES AMONG SUDANESE PATIENTS WITH ACUTE MYELOID LEUKEMIA: RELATION TO HEMATOLOGICAL PROGNOSTIC MARKERS

Background: Viral oncogenesis has remained an area of interest in cancer biology. Viruses have been great tutors of cancer biology, helping researchers to uncouple many signaling pathways and identifying critical therapeutic targets. Aim: The aim of this study was to assess the incidence of cytomegalovirus (CMV) infection and its impact on hematological prognostic markers of Acute Myeloid Leukemia (AML) among Sudanese populations. Method: The seroprevlance of CMV infection in AML patients was assessed in 100AML and 100 age and gender-matched controls. The associations of total white cell count and absolute blast count with the seroprevlance were examined. Results: The prevalence of CMV infection was 81% in patients and 17% in control subjects. Total white cell count and blast count were higher in AML CMV positive patients than AML CMV negative patients. Conclusion: Our findings indicate a high incidence of CMV infections in AML and its worse association with hematological markers could emphasize the role of CMV in the progression of AML. KEYWORDS: Acute myeloid leukemia; Cytomegalovirus

CYTOMEGALOVIRUS IgG AND IgM ANTIBODIES AMONG SUDANESE PATIENTS WITH ACUTE MYELOID LEUKEMIA: RELATION TO HEMATOLOGICAL PROGNOSTIC MARKERS

Background: Viral oncogenesis has remained an area of interest in cancer biology. Viruses have been great tutors of cancer biology, helping researchers to uncouple many signaling pathways and identifying critical therapeutic targets. Aim: The aim of this study was to assess the incidence of cytomegalovirus (CMV) infection and its impact on hematological prognostic markers of Acute Myeloid Leukemia (AML) among Sudanese populations. Method: The seroprevlance of CMV infection in AML patients was assessed in 100AML and 100 age and gender-matched controls. The associations of total white cell count and absolute blast count with the seroprevlance were examined. Results: The prevalence of CMV infection was 81% in patients and 17% in control subjects. Total white cell count and blast count were higher in AML CMV positive patients than AML CMV negative patients. Conclusion: Our findings indicate a high incidence of CMV infections in AML and its worse association with hematological markers could emphasize the role of CMV in the progression of AML. KEYWORDS: Acute myeloid leukemia; Cytomegalovirus

Non-Hermitian von Roos Hamiltonian's η\eta-weak-pseudo-Hermiticity, isospectrality and exact solvability

A complexified von Roos Hamiltonian is considered and a Hermitian first-order intertwining differential operator is used to obtain the related position dependent mass $\eta$-weak-pseudo-Hermitian Hamiltonians. Using a Liouvillean-type change of variables, the $\eta$-weak-pseudo-Hermitian von Roos Hamiltonians H(x) are mapped into the traditional Schrodinger Hamiltonian form H(q), where exact isospectral correspondence between H(x) and H(q) is obtained. Under a user-friendly position dependent mass settings, it is observed that for each exactly-solvable $\eta$-weak-pseudo-Hermitian reference-Hamiltonian H(q)there is a set of exactly-solvable $\eta$-weak-pseudo-Hermitian isospectral target-Hamiltonians H(x). A non-Hermitian PT-symmetric Scarf II and a non-Hermitian periodic-type PT-symmetric Samsonov-Roy potentials are used as reference models and the corresponding $\eta$-weak-pseudo-Hermitian isospectral target-Hamiltonians are obtained.Comment: 11 pages, no figures

Plasma and intracellular (platelet) zinc levels in chronic renal failure (CRF) patients under different treatment modalities

The causes and degree of zinc (Zn) deficiency in uraemia are still controversial. The effect of different treatment modalities are still unsettled. Plasma Zn represents only a small part of the total body Zn (about 0.5%). Thus determination of intracellular Zn in the peripheral blood cells might be more reliable. The present study was designed to assess the actual Zn status in uraemia and to find whether the treatment modalities of CRF (conservative and dialytic) could influence Zn status. Also to determine the elfeet of single dialysis session, type of dialysis and dialysate buffer on the Zn status.This study included ten healthy controls and fourty CRF patients divided in three subgroups on different treatment modalities (10 conservative treatment, 15 on intermittent perioneal dialysis ((IPD) and 15 on haemedialysis (HD). Zinc was measured by atomic absorption spectrophotometry in plasma and platelets. Statistically significant decrease of plasma Zn and significant increase of platelet Zn were found in CRF patients on different treatment modalities as compared to controls (P<0.01), but there was no significant difference in this respect hetween the three uraemic subgroups. There was no difference as regard serum protein and albunun levels in uraemic subgroups compared to controls. Moreover plasma Zn was significantly increased (still less than control) and platelet Zn was significantly decreased (P<0.01) after a single dialysis session in both IPD and HD subgroups, but the changes of both parameters (before and after dialysis) were insignificant in IPD patients compared to HD patients.Significant negative correlation was found between platelet Zn and creatinine clearance in the three uraemic subgroups (r = -0.81 P<0.01 in conservative patients, r= -0.72 P<0.01 in IPD and r= -0.76 P<0.01 in HD) while no correlation could be detected between the duration of dialysis and each of platelet & plasma Zn and between plasma Zn and each of platelet Zn, serum creatinine and clearance. Plasma Zn showed transient significant rise in HD patients using bicarbonate (11.6 ± 1.1 umol/L) as compared to those using acetate buffer (9.1 ± 1.3 umol/L), P<0.01. We can conclude that intracellular measurements of Zn (platelet) is of value in diagnosis and monitoring of Zn status in uraemics. Different treatment modalities does not influence Zn haernostasis. with no superiority of particular type of dialysis in this respect. The effect of a single dialysis session and the use of bicarbonate versus acetate buffer was just a transient rise of plasma Zn due to haemoconcentration and better correction of acidosis during dialysis

Part of the D - dimensional Spiked harmonic oscillator spectra

The pseudoperturbative shifted - l expansion technique PSLET [5,20] is generalized for states with arbitrary number of nodal zeros. Interdimensional degeneracies, emerging from the isomorphism between angular momentum and dimensionality of the central force Schrodinger equation, are used to construct part of the D - dimensional spiked harmonic oscillator bound - states. PSLET results are found to compare excellenly with those from direct numerical integration and generalized variational methods [1,2].Comment: Latex file, 20 pages, to appear in J. Phys. A: Math. & Ge

Screening for Antibacterial Activity of Andrographis paniculata Used in Malaysian Folkloric Medicine: A Possible Alternative for the Treatment of Skin Infections

In this study non-polar (dichloromethane) and polar (MeOH & aqueous) extracts of A. paniculata (whole plant) were evaluated for in vitro antibacterial activity against 12 skin disease causing bacterial strains (7 gram positive strains; Staphylococcus saprophyticus, Staphylococcus epidermis, Staphylococcus aureus, Streptococcus pyogenes, Bacillus anthracis, Micrococcus luteus, Enterococcus faecalis) and 5 gram negative strains; Proteus mirabilis, Proteus vulgaris, Klebsiella pneumoniae, Neisseria meningitis, Pseudomonas aeruginosa ) using the disc diffusion method at three concentrations; 1000, 500, and 250 μg/disc respectively in order to ascertain its folkloric claim to treat skin infections. The extracts showed significant antibacterial activities against both the Gram-positive and Gram-negative bacterial strains tested. Highest significant antibacterial activity was exerted by the MeOH extract against E. faecalis at 1000 μg/disc (24.00 ± 0.00 mm) and the least activity by the DCM extract against N. meningitis at 250 μg/disc (6.00 ± 0.00mm). The minimum inhibitory concentration ranged between 150 μg /mL and 300 μg /mL depending on microorganism and various extracts. Presence of phytochemicals such as terpenoids, tannins, flavonoids, saponins, alkaloids, amino acids and steroids were observed. These results candidly suggest the presence of promising antibacterial substances in the polar as well as non-polar extracts which could be potential phytomedicine for the treatment of skin infections caused by pathogenic bacterial strains. These findings explicitly support its traditional claims and form a strong basis for further efforts to explore A. paniculata’s antibacterial potential to treat skin frailties efficaciously. Our results confer the utility of this plant extracts in developing a novel broad spectrum antimicrobial agent