Electrochemically activated carbon fiber sensors as fast and sensitive adenine metabolite amperometric detectors

A direct and fast voltammetric method of determination of 2,8-dihydroxyadenine (2,8-DHA), with a novel nanostructured carbon fiber sensor (CFS), is revealed in this work. To achieve high sensitivity required in biological determinations, before the determination of 2,8-DHA, carbon fiber sensors were activated by electrochemical pretreatment method. The electrochemical activation process generates a nanostructured carbon fiber surface, which is stable. The high stability of the active surface, and the high reproducibility of the activation process, leads to reproducible and sensitive fast scan voltammetric (FSV) determinations of 2,8-DHA. The 2,8-DHA sensitivity was determined in 31 mM phosphate buffer and Hank’s Balanced Salt solution (HBSS) : phosphate buffer (1:5) pH = 7.4, with different scan rates of 250, 500 and 1000 V/s. The potential window in the determinations was from -1.0 to 1.5 V (vs. SCE). A high sensitivity of the new method of 2,8-DHA determinations by FSV at 500 V/s was found to be 0.40±0.01 nA µM-1 (r2 = 0.998) from the calibration plot of 2,8-DHA, with a linear dynamic range from 1-20 µM, and a limit of detection of 1 µM under physiological conditions

Synthesis and applications of silver nanoparticles

AbstractOver the past few decades, nanoparticles of noble metals such as silver exhibited significantly distinct physical, chemical and biological properties from their bulk counterparts. Nano-size particles of less than 100nm in diameter are currently attracting increasing attention for the wide range of new applications in various fields of industry. Such powders can exhibit properties that differ substantially from those of bulk materials, as a result of small particle dimension, high surface area, quantum confinement and other effects. Most of the unique properties of nanoparticles require not only the particles to be of nano-sized, but also the particles be dispersed without agglomeration. Discoveries in the past decade have clearly demonstrated that the electromagnetic, optical and catalytic properties of silver nanoparticles are strongly influenced by shape, size and size distribution, which are often varied by varying the synthetic methods, reducing agents and stabilizers. Accordingly, this review presents different methods of preparation silver nanoparticles and application of these nanoparticles in different fields

Novel strategies to prevent and overcome relapse after allogeneic hematopoietic cell transplantation in acute lymphoblastic leukemia

The outcome of B-cell acute lymphoblastic leukemia (B-ALL) has improved over time with the incorporation of multi-agent chemotherapy in the treatment landscape as well as the recent approval of immunotherapeutic agents allowing a larger proportion of patients to undergo allogeneic hematopoietic cell transplantation (allo-HCT) which is still considered a potential curative approach. However, relapse post-transplant is still occurring and constitutes a common cause of treatment failure in B-ALL. The present review aims to discuss the novel strategies and therapies used to prevent and overcome relapse post allo-HCT in patients with ALL, focusing on the role of tyrosine kinase inhibitors in Philadelphia chromosome positive B-ALL, the role of innovative agents such as blinatumomab and inotuzumab ozogamicin, and finally the role of cellular therapy

LYMPHOMA: EXPLORING AWARENESS IN LEBANON

In 2012, 14.1 million patients were diagnosed with cancer worldwide of which 385,700 estimated new cases of non-Hodgkin lymphoma (NHL). Also, 81,080 new cases of lymphoma were reported in the United States (US) among both genders in 2016. In Lebanon, Lymphoma represents the fifth most frequent cancer, nonetheless, little is known regarding its epidemiological attributes. This study aims to determine the current knowledge of the Lebanese people living in Lebanon about Lymphoma. About 400 participants were approached in public places, universities, hospitals or work places in different regions across Lebanon. A survey including questions about lymph nodes, cancer and lymphoma as well as demographic characteristics was given to all eligible participants. The data was collected and analyzed using SPSS and p value \u3c 0.05 was considered significant. When asked about the types of cancers they knew, the majority of participants (93.5%) were able to identify breast cancer, while less than half of (30.67%) identified lymphoma as a cancer. Enlargement of the lymph nodes (LN) was the most common recognized symptom (93.4%) whereas 76.42% thought that family history of lymphoma was the most frequent risk factor for lymphoma. Among those who claim to know about lymphoma (30%), true in-depth knowledge about lymphoma was still lacking. The results of this independently conducted survey reveal the lack of awareness about lymphomas among the Lebanese population and highlight the need for campaigns to increase the knowledge and awareness

Survey of Leafhopper Species in Almond Orchards Infected with Almond Witches'-Broom Phytoplasma in Lebanon

Leafhoppers (Hemiptera: Auchenorrhyncha: Cicadellidae) account for more than 80% of all “Auchenorrhynchous” vectors that transmit phytoplasmas. The leafhopper populations in two almond witches'-broom phytoplasma (AlmWB) infected sites: Tanboureet (south of Lebanon) and Bourj El Yahoudieh (north of Lebanon) were surveyed using yellow sticky traps. The survey revealed that the most abundant species was Asymmetrasca decedens, which represented 82.4% of all the leafhoppers sampled. Potential phytoplasma vectors in members of the subfamilies Aphrodinae, Deltocephalinae, and Megophthalminae were present in very low numbers including: Aphrodes makarovi, Cicadulina bipunctella, Euscelidius mundus, Fieberiella macchiae, Allygus theryi, Circulifer haematoceps, Neoaliturus transversalis, and Megophthalmus scabripennis. Allygus theryi (Horváth) (Deltocephalinae) was reported for the first time in Lebanon. Nested PCR analysis and sequencing showed that Asymmetrasca decedens, Empoasca decipiens, Fieberiella macchiae, Euscelidius mundus, Thamnottetix seclusis, Balclutha sp., Lylatina inexpectata, Allygus sp., and Annoplotettix danutae were nine potential carriers of AlmWB phytoplasma. Although the detection of phytoplasmas in an insect does not prove a definite vector relationship, the technique is useful in narrowing the search for potential vectors. The importance of this information for management of AlmWB is discussed