Synthesis and Spectral Analysis of Some Metal Ions Complexes with Mixed Ligands of Schiff Base and 1, 10-Phenanthroline

The free Schiff base ligand (HL1) is prepared by being mixed with the co-ligand 1, 10-phenanthroline (L2). The product then is reacted with metal ions: (Cr+3, Fe+3, Co+2, Ni+2, Cu+2 and Cd+2) to get new metal ion complexes. The ligand is prepared and its metal ion complexes are characterized by physic-chemical spectroscopic techniques such as: FT-IR, UV-Vis, spectra, mass spectrometer, molar conductivity, magnetic moment, metal content, chloride content and microanalysis (C.H.N) techniques. The results show the formation of the free Schiff base ligand (HL1). The fragments of the prepared free Schiff base ligand are identified by the mass spectrometer technique. All the analysis of ligand and its metal complexes are in good agreement with the theoretical values indicating the purity of Schiff base ligand and the metal complexes. From the above data, the molecular structures for all the metal complexes are proposed to be octahedra

Enhancement efficiency of polymer solar cells by incorporating metal oxide nanoparticles

Gold nanoparticles (AuNPs) deposited at the interface of the hole-collecting buffer layer [poly(3,4ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)] and regiore-gular poly (3-hexylthiophene) :[6,6]-phenylC61-butyricacidmethylester(rr-P3HT):(PCBM) active layer were found to significantly increase solar cell performance. The photo-physical properties of these devices incorporated with AuNPs with different space distributions in the interface of PEDOT:PSS buffer layer and P3HT:PCBM active layer are investigated. We find that, the optical property is improved as the AuNPs are large enough to penetrate into the active layer and the performance of Photovoltaic solar cells (PSCs) with large AuNPs can benefit from the improved hole collection efficiency. The efficiency enhancement for the device with a PEDOT:PSS: AuNPs film is more significant than for the device with PEDOT:PSS film. Keywords: PEDOT:PSS, Buffer layer, P3HT:PCBM, Gold oxide nanoparticle

Effect of type of mixing water and sand on the physico–mechanical properties of magnesia cement masonry units

AbstractThis study has been conducted to investigate the influences of sand addition and mixing waters with different ratios on the physico-mechanical properties of magnesium oxychloride cement (MOC) masonry units. Three mixtures (M, MI and MII) were prepared to make magnesium oxychloride cement from the sand dunes as a filler material with some different additives. The mixture (M) was prepared by seawater instead of tap water in the mixing process, other mixtures (MI & MII) used drinking water. The physico-mechanical properties were studied in means of determination of bulk density, water absorption and compressive strength of the hardened MOC specimens cured in air at the lab ambient conditions for 3, 7, and 28days. It was recognized that the compressive strengths decreased with the increase of sand dunes content. The specimens of the all cured mixtures fulfilled superior properties compared with the required limits for concrete and limestone masonry units of a heavy density type. Also, it was found that using of the seawater leads to increase the physico-mechanical properties of the MOC specimens and can be used as mixing water in the manufacture of masonry units instead of the traditional drink water after ensuring of the other demanded governing properties

Effect of Sperm Separation Methods on Morphology and Functions of Frozen Buffalo Spermatozoa

This work was planned to compare three methods for selection of active buffalo spermatozoa, examine the effects of these separation methods on morphology, viability and functions of spermatozoa used for IVF purposes. Ten frozen straws per trial (10 times) were pooled and divided into 4 aliquots:  A) First aliquot was considered as control without any separation method. B) Second aliquot was subjected to sperm selection by density gradient method (percoll:PureSperm) using 40-80% double density gradient. C) The third aliquot was subjected to swim-up in sp-TALP. D) The fourth aliquot was subjected to washing by centrifugation with sp-TALP. The percentage of motility increased for Percoll, swim up and washing than control (86.0, 73.0, and 66.5 vs. 56.5) respectively. Sperm abnormalities % was significantly decreased after Percoll, swim up and sperm wash separation methods. Spermatozoa obtained by Swim up and Percoll had the highest percentage of intact membrane. Different spermatozoa separation methods significantly increased the lytic activity of the recovered spermatozoa. Live spermatozoa percentage with reacted acrosome significantly increased after both swim up separation and washing. The percentage of dead spermatozoa with reacted acrosome significantly decreased after percoll separation but it did not change when the swim up method was used. Finally it is concluded that, density gradient centrifugation using PureSperm® could be considered as the method of choice for selection of frozen thawed buffalo spermatozoa and presumably with a high potential fertilizing ability. density gradient centrifugation using PureSperm® could be considered as the method of choice for selection of frozen thawed buffalo spermatozoa

PREVALENCE OF HBV AND HCV; AND THEIR ASSOCIATED RISK FACTORS AMONG PUBLIC HEALTH CENTER CLEANERS AT SELECTED PUBLIC HEALTH CENTERS IN SANA'A CITY-YEMEN

Objective:  Occupational exposure of public health center cleaners (PHCCs) to blood and body fluids after skin injury or mucous membrane contact constitutes a risk for transmission of blood-borne pathogens. In the industrialized world, occupational surveillance is performed to assess and monitor health hazards related to blood borne pathogens. In contrast, in developing countries as Yemen, exposure and health impacts are rarely monitored and much remains to be done to protect PHCCs. The objective of this study was to determine the prevalence of HBV and HCV and their potential risk factors among PHCCs.  Methods: A cross sectional prospective study was conducted among 388 PHCCs. Data was collected using pre-tested and structured questions. Venous blood was collected and the sera were tested for HBV surface antigen and anti-hepatitis C antibodies using enzyme-linked immune sorbent assay technique. The data were analysis by EPI-Info. Chi square and Odds ratio tests were used to assess the association of risk factors with HBV and HCV positivity. Results: Results revealed that among the total 388 PHCCs examined, HBV and HCV were detected in 32 (8.2%), and 4 (1.03%) of them respectively.  There was significant risk factors of hepatitis viruses with age group 20-24 years (OR=2.8), exposure to patients blood (OR=3), accidental stick of used needles (OR=2.3), sharp injury (OR=5.6), history of blood transfusion (OR=2.5), and hospital admission (OR=2.7). Also significant protected roles for HBV vaccine was found with infection. Conclusion: In conclusion high prevalence rates of HBV and HCV occurred in PHCCs. Unfortunately; all workers did not take training on medical waste and few workers use protective measures consistently as vaccination. There is needed to make vaccination of health care workers against HBV infection a firm policy and ensure complete and consistent adherence to work standard safety measures.                    Peer Review History: Received 17 September 2018;   Revised 12 October; Accepted 2 November, Available online 15 November 2018 Academic Editor:  Dr. Iman Muhammad Higazy, National Research Center, Egypt, [email protected] Received file:        Reviewer's Comments: Average Peer review marks at initial stage: 5.0/10 Average Peer review marks at publication stage: 7.5/10 Reviewer(s) detail: Dr. Taiwo O Elufioye, University of Ibadan, Nigeria, [email protected]  Dr. DANIYAN Oluwatoyin Michael, Obafemi Awolowo University, ILE-IFE, Nigeria, [email protected] Similar Articles: EXPLOSION OF HEPATITIS B AND C VIRUSES AMONG HEMODIALYSIS PATIENTS AS A RESULT OF HEMODIALYSIS CRISIS IN YEMEN SERO-EPIDEMIOLOGICAL STUDY OF HEPATITIS B, C, HIV AND TREPONEMA PALLIDUM AMONG BLOOD DONORS IN HODEIDA CITY- YEMEN PREVALENCE OF HEPATITIS G VIRUS AMONG PATIENTS WITH CHRONIC LIVER DISEASE AND HEALTHY INDIVIDUALS, SANA'A CITY-YEME

Differential Association between HER2/neu and Angiogenesis in Breast Cancer

The HER-2/neu oncogene encodes a transmembrane tyrosine kinase receptor and a member of the epidermal growth factor receptors (EGFR/ErbB) family. Over-expression of this oncogene is known to contribute to pathogenesis and aggressive progression in breast cancer. On the other hand, angiogenesis is a physiological process of forming new blood vessels from pre-existing ones; however it is essential for tumor growth and transitional from benign stage to malignant form and also fundamental process for metastasis of tumors. In this study the main aim was to investigate whether angiogenesis is the cause for increased aggressive behavior of HER2 overexpression subtype in breast cancer. A variety of approaches were employed to investigate the main aim: quantification of angiogenesis using a mouse cancer cells implanted model; Drabkin’s assay for hemoglobin measurement; morphology assessment of cell lines; Bio-Plex analysis of angiogenesis factors angiopoietin-2, follistatin, G-CSF, HGF, IL-8, Leptin, PDGF-BB, PECAM-1 and VEGF; and reverse transcriptase-PCR on VEGFA and HIF-1 alpha genes expression. The data from this study showed that the AU-565 cell line which over-expresses HER2 receptors showed a significant decrease in both tumor weight and hemoglobin measurement when the cells were treated with anti-HER2 implanted in nude mice. Also, the data showed an increased expression of angiogenic factors and genes (mainly VEGF, VEGFA, Angiopoietin, and IL-8) in AU-565 as compared to MCF-7 cells, which have low expression of HER2 receptors. This suggests that breast cancer with HER2/neuoncogenes is associated with more angiogenic activities that result in an increased aggressive behavior of this form of cancer