Magnetic cobalt ferrite nanoparticles as an efficient catalyst for oxidation of alkenes

AbstractCobalt ferrite magnetic nanoparticles with mean sizes of 25 nm were used as a catalyst for the oxidation of various alkenes in the presence of tert- butylhydroperoxide (t-BuOOH). This study has demonstrated that CoFe2O4 nanoparticles can act as an efficient catalyst for the conversion of alkenes to the related aldehydes or epoxides, with almost quantitative yields. The catalyst can be readily isolated by using an external magnet and no obvious loss of activity was observed when the catalyst was reused in five consecutive runs. The effects of some parameters, such as temperature, types of oxidant and solvents, on the oxidation reactions were also investigated. The results showed that when CoFe2O4 is used with t-BuOOH as oxidant for the oxidation of some alkenes, better results are obtained compared to most of the studied similar ferrites

A comparative study of two kinds of tretinoin creams on acme vulgaris

آکنه بیماری شایعی است که 85 تا 100 مردم در طول زندگی دچار آن می شوند. داروهای زیادی برای درمان آکنه مصرف می شوند و ترتینوئین یکی از داروهای کومدولیتیک و پر مصرف برای درمان آکنه است. علی رغم تفاوت قیمت زیاد ترتینوئین وارداتی با ترتینوئین ساخت داخل، پزشکان و بیماران با اعتقاد بر اینکه نوع داخلی کم اثر و پر عارضه است، تمایل زیادی به تجویز و مصرف انواع وارداتی دارو دارند. لذا این تحقیق به منظور مقایسه تأثیــــــر و عوارض ترتینوئین 05/0 ساخت شرکت ایران دارو و کرم وارداتی کترل ( Ketrel) انجام شده است. در یک کارآزمائی بالینی دو سوکور، تعداد 69 بیمار مبتلا به آکنه کومدونال بصورت تصادفی در یکی از دو گروه داروئی قرار داده شدند. گروه اول ( 35 نفر) با کرم ترتینوئین شرکت ایران دارو و گروه دوم با کرم وارداتی کترل (34 نفر) تحت درمان قرار گرفتند. پس از 3 ماه مصرف دارو ضمن ثبت عوارض ، تعداد آکنه در دو گروه شمارش و با قبل از مصرف دارو مقایسه شد. از گـروه مصرف کننده ترتینوئین ایران دارو 24 و از گروه مصرف کننده ترتینوئین 5/61 پاسخ به درمان در حد خوب ( 60 تا 100 بهبودی) داشتند (

X-Raying the Dark Side of Venus - Scatter from Venus Magnetotail?

This work analyzes the X-ray, EUV and UV emission apparently coming from the Earth-facing (dark) side of Venus as observed with Hinode/XRT and SDO/AIA during a transit across the solar disk occurred in 2012. We have measured significant X-Ray, EUV and UV flux from Venus dark side. As a check we have also analyzed a Mercury transit across the solar disk, observed with Hinode/XRT in 2006. We have used the latest version of the Hinode/XRT Point Spread Function (PSF) to deconvolve Venus and Mercury X-ray images, in order to remove possible instrumental scattering. Even after deconvolution, the flux from Venus shadow remains significant while in the case of Mercury it becomes negligible. Since stray-light contamination affects the XRT Ti-poly filter data from the Venus transit in 2012, we performed the same analysis with XRT Al-mesh filter data, which is not affected by the light leak. Even the Al-mesh filter data show residual flux. We have also found significant EUV (304 A, 193 A, 335 A) and UV (1700 A) flux in Venus shadow, as measured with SDO/AIA. The EUV emission from Venus dark side is reduced when appropriate deconvolution methods are applied; the emission remains significant, however. The light curves of the average flux of the shadow in the X-ray, EUV, and UV bands appear different as Venus crosses the solar disk, but in any of them the flux is, at any time, approximately proportional to the average flux in a ring surrounding Venus, and therefore proportional to the average flux of the solar regions around Venus obscuring disk line of sight. The proportionality factor depends on the band. This phenomenon has no clear origin; we suggest it may be due to scatter occurring in the very long magnetotail of Venus.Comment: This paper has been accepted in The Astrophysical Journa

Epidemiology of Poisoning in Northeast of Iran (2004-2013)

Background: Poisoning is a major concern, especially in developing countries. We aimed to focus on poisoning trends based on registry data for the recent 10 years.Methods: This cross-sectional study was performed on registry database of Imam Reza Hospital in Mashhad, Iran. All cases of toxic exposure or poisoning during 2004 to 2013 were included (49189 patients). Data from two national censuses were used for calculating rates. SPSS 11.5 was used for data analysis. P<0.05 was considered statistically significant.Results: There were 49189 admissions during the 10-year period with a mean age of 26.21±14.97 years out of which 50.3% were female. The prevalence rate had increased three times in women and four times in men. Pharmaceutical toxins (63.5%) had the highest proportional mortality ratio, which mostly occurred in winters. The mean age of admission began to decline again in recent years.Conclusion: Analyzing data on secular trends can always enlighten the healthcare decision makers for real health problems. Designing the proper population-based interventions can be one of the many uses of these findings

Synthesis and characterization of nanocomposite NiFe2O4@SalenSi and its application in efficient removal of Ni(II) from aqueous solution

In this work, nano ferrite spinel NiFe2O4 was synthesized by sol-gel method and characterized by SEM, XRD, FT-IR, and VSM. In second step Schiff base made from salicylaldehyde and amino propyl triethoxy silane was used for modification of the synthesized nano ferrit. In the third step removal of Ni(II) was done using modified adsorbent and 95% efficiency was achieved. The removal rate was determined by atomic absorption spectroscopy. These studies showed that the Freundlich isotherm model was fitted well with adsorption data. Moreover, the pseudo-second order kinetic model was fitted very well with experimental data. The results demonstrated that NiFe2O4@SalenSi nanoadsorbent can be used for the removal and recovery of metal ions from wastewater over a number of cycles, indicating its suitability for the design of a continuous process.               KEY WORDS: Nano ferrite, Sol-gel method, Schiff base, Removal of Ni(II), Magnetic nanocomposite Bull. Chem. Soc. Ethiop. 2018, 32(1), 77-88DOI: https://dx.doi.org/10.4314/bcse.v32i1.

Comparison of original and revised reinforcement sensitivity theory in clinically-stable schizophrenia and bipolar disorder patients

ABSTRACT Introduction: The study of personality can help explicate the pathology of psychological disorders. To this end,our study compared the profile of factors from the original (o) and revised (r) reinforcement sensitivity theory (RST) of personality in schizophrenia (SC), bipolar disorder (BD) patients, both compared with healthy controls(HC). Method: 34 SC patients, 52 BD patients, and 72 matched HC completed: Yang Mania Rating Scale (YMRS), Positive and Negative Syndrome Scale (PANSS), Beck Depression Inventory (BDI), BAS/BIS scale, and the Jackson-5 scale. Data were analyzed by chi square, independent t-test, analysis of variance (ANOVA), and multivariate analysis of variance (MANOVA). Results: SC patients had lower o-BIS, r-BIS and o-BAS, and r-BAS scores than the BD and HC groups. Compared to HC, SC and BD patients had higher Freeze and Fight scores. Depression in SC was significantly higher than other two groups; and in BD it was higher than HC. Conclusion: SC, BD, and HC differ on both o-RST and r-RST; however, the more nuanced knowledge from r-RST may be helpful in the diagnosis, etiology and psychotherapy. Keywords: Original reinforcement sensitivity theory Revised reinforcement sensitivity theory Behavioral brain systems Schizophrenia Bipolar disorde

A new class of mixed monotone operators with concavity and applications to fractional differential equations

In this article, we investigate a class of mixed monotone operators with concavity on ordered Banach spaces. As applications, we utilize the main results obtained in this paper to study for solutions of fractional differential equations. An example is also considered to illustrate the main result.Publisher's Versio

Age determination and feeding habits of Nemipterus japonicus (Bloch, 1791) in the northern Oman Sea

Age determination and feeding habits of the Japanese threadfin bream, Nemipterus japonicus, was carried out in the northern Oman Sea (Chabahar area), based on 212 specimens collected between September 2009 and May 2010. The minimum and maximum fork length and body weight were measured as 145, 258 mm and 55.31, 288.12 g. The relationship between Body Weight (BW) and Fork Length (FL) for all individuals was estimated as BW= 0.0001×FL2.83 (r2 = 0.9425, n= 212). The Vacuity Index (VI) was 55.2% that shows N. japonicus is a moderate feeder. The maximum and minimum Gastro-Somatic Index for males was in autumn and winter seasons and for females were in summer and spring. The Food Preference Indices were estimated as: crustacean (63.2%) as main food fishes (38.9%) and molluscs (36.8%) as minor food. Age determination was done by otolith sectioning. A total of 135 sagitta were sectioned. The maximum age was 5+ years old for a female with FL= 256 mm and the youngest one was 1 year old for a female with FL= 145 mm. Based on obtained results there is a significant relationship between feeding and age namely with increase of age, the feeding rate is decreased without any changes in type of feeding and food contents