SOLUTION TO ${\bar{\partial}}$-PROBLEM WITH SUPPORT CONDITIONS IN WEAKLY q-CONVEX DOMAINS

Saber, Sayed Korean Mathematical Society 2018 대한수학회논문집 Vol.33 No.2

Let X be a complex manifold of dimension n $n{\geqslant}2$ and let ${\Omega}{\Subset}X$ be a weakly q-convex domain with smooth boundary. Assume that E is a holomorphic line bundle over X and $E^{{\otimes}m}$ is the m-times tensor product of E for positive integer m. If there exists a strongly plurisubharmonic function on a neighborhood of $b{\Omega}$, then we solve the ${\bar{\partial}}$-problem with support condition in ${\Omega}$ for forms of type (r, s), $s{\geqslant}q$ with values in $E^{{\otimes}m}$. Moreover, the solvability of the ${\bar{\partial}}_b$-problem on boundaries of weakly q-convex domains with smooth boundary in $K{\ddot{a}}hler$ manifolds are given. Furthermore, we shall establish an extension theorem for the ${\bar{\partial}}_b$-closed forms.

THE ${\bar{\partial}}$-PROBLEM WITH SUPPORT CONDITIONS AND PSEUDOCONVEXITY OF GENERAL ORDER IN KÄHLER MANIFOLDS

Saber, Sayed Korean Mathematical Society 2016 대한수학회지 Vol.53 No.6

Let M be an n-dimensional $K{\ddot{a}}hler$ manifold with positive holomorphic bisectional curvature and let ${\Omega}{\Subset}M$ be a pseudoconvex domain of order $n-q$, $1{\leq}q{\leq}n$, with $C^2$ smooth boundary. Then, we study the (weighted) $\bar{\partial}$-equation with support conditions in ${\Omega}$ and the closed range property of ${\bar{\partial}}$ on ${\Omega}$. Applications to the ${\bar{\partial}}$-closed extensions from the boundary are given. In particular, for q = 1, we prove that there exists a number ${\ell}_0$ > 0 such that the ${\bar{\partial}}$-Neumann problem and the Bergman projection are regular in the Sobolev space $W^{\ell}({\Omega})$ for ${\ell}$ < ${\ell}_0$.

GLOBAL SOLUTIONS FOR THE ${\bar{\partial}}$-PROBLEM ON NON PSEUDOCONVEX DOMAINS IN STEIN MANIFOLDS

Saber, Sayed Korean Mathematical Society 2017 대한수학회지 Vol.54 No.6

In this paper, we prove basic a priori estimate for the ${\bar{\partial}}$-Neumann problem on an annulus between two pseudoconvex submanifolds of a Stein manifold. As a corollary of the result, we obtain the global regularity for the ${\bar{\partial}}$-problem on the annulus. This is a manifold version of the previous results on pseudoconvex domains.

STUDY ON CLEAN ORDERED RINGS DERIVED FROM CLEAN ORDERED KRASNER HYPERRINGS

Saber Omidi,Bijan Davvaz 한국수학교육학회 2018 純粹 및 應用數學 Vol.25 No.2

In this paper, we introduce the notion of a clean ordered Krasner hy-perring and investigate some properties of it. Now, let (R;+,;≤) be a clean ordered Krasner hyperring. The following is a natural question to ask: Is there a strongly regular relation σ on R for which R/σ is a clean ordered ring? Our motivation to write the present paper is reply to the above question.

Worldwide prevalence of fungal coinfections among COVID-19 patients: a comprehensive systematic review and meta-analysis

Saber Soltani,Milad Zandi,Samireh Faramarzi,Ramin Shahbahrami,Mohebat Vali,Sara Akhavan Rezayat,Reza Pakzad,Pooneh Malekifar,Iraj Pakzad,Neda Jahandoost,Jalal Moludi 질병관리본부 2022 Osong Public Health and Research Persptectives Vol.13 No.1

Microbial coinfections can increase the morbidity and mortality rates of viral respiratory diseases. Therefore, this study aimed to determine the pooled prevalence of fungal coinfections in coronavirus disease 2019 (COVID-19) patients. Web of Science, Medline, Scopus, and Embase were searched without language restrictions to identify the related research on COVID-19 patients with fungal coinfections from December 1, 2019, to December 30, 2020. A random-effects model was used for analysis. The sample size included 2,246 patients from 8 studies. The pooled prevalence of fungal coinfections was 12.60%. The frequency of fungal subtype coinfections was 3.71% for Aspergillus, 2.39% for Candida, and 0.39% for other. The World Health Organization’s Regional Office for Europe and Regional Office for Southeast Asia had the highest (23.28%) and lowest (4.53%) estimated prevalence of fungal coinfection, respectively. Our findings showed a high prevalence of fungal coinfections in COVID-19 cases, which is a likely contributor to mortality in COVID-19 patients. Early identification of fungal pathogens in the laboratory for COVID-19 patients can lead to timely treatment and prevention of further damage by this hidden infection.

Phytochemical/Antioxidant Properties and Individual/Synergistic Actions of Salvia officinalis L. Aqueous Extract and Loperamide on Gastrointestinal Altering Motor Function

Saber Jedidi,Kais Rtibi,Slimen Selmi,Foued Aloui,Houcine Selmi,Dalanda Wannes,Houcem Sammari,Nourhe`ne Dhawefi,Abbes Chaaˆbane,Hichem Sebai 한국식품영양과학회 2019 Journal of medicinal food Vol.22 No.12

Medicinal plants are known by pharmacological relevance and were used for long time to prevent/treat numerous gastrointestinal (GI) disorders. The current study focuses on the phytochemical/antioxidant characteristics of sage aqueous extract (SAE), as well as its pharmacological actions on altering motor function in the intestine and related disruptions. In vitro phytochemical/antioxidant properties were investigated by colorimetric/biochemical methods. Male rats were divided into seven groups of six animals in each: control (C), castor oil (CO), CO + loperamide (LOP, 10 mg/kg, b.w., p.o.), CO + various doses of SAE (50, 100, and 200 mg/kg, b.w., p.o.), and the mixture (MIX: SAE, 50 mg/kg, b.w., p.o. + LOP, 5 mg/kg, b.w., i.p.) group. In vivo GI/physiological/pharmacological actions of SAE were explored based on the watery/frequent stools, enteropooling, and GI transit time, as well as their associated disturbances. The aqueous extract of S. officinalis contains high tannins/flavonols/anthocyanin contents and a strong, free radical scavenging activity (EC50 = 48.56 ± 0.34 μg/mL). SAE/MIX significantly reduced CO-induced diarrhea in a dose-dependent manner. SAE/MIX decreased also the gastric and intestinal mucosal malondialdehyde/hydrogen peroxide levels and preserved the normal activities/levels of enzymatic/nonenzymatic antioxidants. Added to that, we showed that SAE/MIX pretreatment provided stability of lipid profile (cholesterol and triglycerides), hepatic transaminases, renal injury indicators, and C-reactive protein/alkaline phosphatase levels changed by CO intoxication. These findings suggested that SAE/MIX exerted benefic individual/synergistic effects confirming their use as a strategy in the treatment of GI physiological disorders.

Expression of GNA and biting site-restricted cry1Ac in cotton; an efficient attribution to insect pest management strategies

Saber Delpasand Khabbazi,Afsaneh Delpasand Khabbazi,S. Fatih Özcan,Allah Bakhsh,Dilek Başalma,Sebahattin Özcan 한국식물생명공학회 2018 Plant biotechnology reports Vol.12 No.4

Insect-resistant transgenic cotton has been commercialized for two decades. Most of the introduced cultivars express Bt gene(s) constitutively under the control of 35S promoter in whole-plant tissues. However, there have been other promoters considered by researchers to confine the toxin expression to targeted organ and tissues. We developed a triple-gene construct including GNA, cry1Ac and cp4 epsps genes. We attempted to confine cry1Ac expression to insect biting sites by cloning it to downstream of a wound-inducible promoter isolated from Asparagus officinalis (AoPR1). Moreover, to broaden the range of resistance, GNA was driven by the 35S promoter to target the sap-sucking insects like aphids which impose large losses in cotton production. To select the transformants in selection medium and for glyphosate tolerance, GNA and cry1Ac genes were accompanied with cp4 epsps gene. Two binary vectors harboring desired genes were constructed and utilized in the study (pGTGNAoC1AC and pGTGN35C1AC). Transformation of cultivar GSN-12 was carried out by employing Agrobacterium tumefaciens strain EHA105. Plantlets were primarily screened under glyphosate (N-phosphonomethyl glycine) selection pressure and subsequently subjected to molecular and biotoxicity assays. Introduction of cry1Ac and GNA to cotton plant conferred resistance to Spodoptera littoralis and Aphis gossypii Glover. Restriction of cry1Ac toxin protein to insect biting sites along with a plant lectin attributes significantly to insect pest management strategies.

Design and Implementation of Direct Torque Control Based on an Intelligent Technique of Induction Motor on FPGA

Saber Krim,Soufien Gdaim,Abdellatif Mtibaa,Mohamed Faouzi Mimouni 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.4

In this paper the hardware implementation of the direct torque control based on the fuzzy logic technique of induction motor on the Field-Programmable Gate Array (FPGA) is presented. Due to its complexity, the fuzzy logic technique implemented on a digital system like the DSP (Digital Signal Processor) and microcontroller is characterized by a calculating delay. This delay is due to the processing speed which depends on the system complexity. The limitation of these solutions is inevitable. To solve this problem, an alternative digital solution is used, based on the FPGA, which is characterized by a fast processing speed, to take the advantage of the performances of the fuzzy logic technique in spite of its complex computation. The Conventional Direct Torque Control (CDTC) of the induction machine faces problems, like the high stator flux, electromagnetic torque ripples, and stator current distortions. To overcome the CDTC problems many methods are used such as the space vector modulation which is sensitive to the parameters variations of the machine, the increase in the switches inverter number which increases the cost of the inverter, and the artificial intelligence. In this paper an intelligent technique based on the fuzzy logic is used because it is allows controlling the systems without knowing the mathematical model. Also, we use a new method based on the Xilinx system generator for the hardware implementation of Direct Torque Fuzzy Control (DTFC) on the FPGA. The simulation results of the DTFC are compared to those of the CDTC. The comparison results illustrate the reduction in the torque and stator flux ripples of the DTFC and show the Xilinx Virtex V FPGA performances in terms of execution time.

Effect of including n-3/n-6 fatty acid feed sources in diet on fertility and hatchability of broiler breeders and post-hatch performance and carcass parameters of progeny

Saber, Seyyed Naeim,Kutlu, Hasan Rustu Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.2

Objective: The present trial was conducted to determine the influence of different dietary fatty acid (omega-3 and omega-6) sources on reproductive performance of female broiler breeders and growth performance and carcass traits of their progeny. Methods: Two hundred and twenty, 25 weeks old Ross-308 male (20) and female (200) broiler breeders were used in the experiment for the period of 6 weeks. All birds were randomly divided into four dietary treatments (containing 2% soybean oil, 2% sunflower oil, 2% flaxseed oil, and 2% fish oil) each with five replicates of one male and ten females. Throughout this experiment hatching performance of broiler breeders, progeny growth performance and carcass parameters were recorded. Results: The results showed that the inclusion of different fatty acid sources in female broiler breeders diet had no significant effects (p>0.05) on number of fertile eggs, post-hatch mortality, and fertility rate. The soybean oil supplemented group had significantly (p<0.05) higher late embryonic mortality compared to other three treatments. Conclusion: It was concluded that inclusion of 2% of different sources of omega-3 and omega-6 fatty acids (especially 2% flax seed oil) in broiler breeders' diet can reduce late embryonic mortality. The other reproductive characteristics of parents and growth and carcass characteristics of progeny remained unaltered by dietary sources of omega-3 and omega-6 fatty acids.

Root Proliferation, Proton Efflux, and Acid Phosphatase Activity in Common Bean (Phaseolus vulgaris) Under Phosphorus Shortage

Saber Kouas,Ahmed Debez,Tarek Slatni,Nahla Labidi,Jean Jacques Drevon,Chedly Abdelly 한국식물학회 2009 Journal of Plant Biology Vol.52 No.5

The impact of phosphorus (P) availability on root proliferation, proton efflux, and acid phosphatase activities in roots and leaves was investigated in two lines of common bean (Phaseolus vulgaris): BAT 477 and CocoT. Phosphorus was supplied as KH2PO4 at 0 and 60μmol per plant (0P and 60P, respectively). Under P shortage, the plant growth was more restricted in CocoT than in BAT 477, shoots being more affected than roots. The root area increased significantly at 0P in both lines. Up to 1 week following P shortage, the proton efflux increased in both lines despite a higher extent in BAT 477 as compared to CocoT. Root acid phosphatase activity was significantly higher under P limitation in the both lines, this trend being more pronounced in BAT 477 than in CocoT. This was also true for the leaf acid phosphatase. Regardless of the bean line, higher values were recorded for the old leaves as compared to the young ones for this parameter. Interestingly, a significant correlation between Pi content in old leaves and their acid phosphatase activity was found in P-lacking (0P) plants of the both bean lines, suggesting that acid phosphatase may contribute to increase the phosphorus use efficiency in bean through the P remobilization from the old leaves. As a whole, our results highlight the significance of the root H+ extrusion and the acid phosphatase activity rather than the root proliferation in the relative tolerance of BAT 477 to severe P deficiency. Keywords Phosphorus availability. Phaseolus vulgaris L . Root proliferation . Proton efflux . Acid phosphatase . Phosphorus use efficiency