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Smart superabsorbent alginate/carboxymethyl chitosan composite hydrogel beads as efficient biosorbents for methylene blue dye removal

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Journal of Materials Science & Technology 2023年第28期159卷 81-90页

作者： Zhen Zhang noureddine abidi Lucian Lucia Department of Forest Biomaterials NC State UniversityRaleighNCUSA Fiber and Biopolymer Research Institute Department of Plant and Soil ScienceTexas Tech UniversityLubbockTXUSA Department of Chemistry NC State UniversityRaleighNCUSA

The presence of toxic dyes in the aqueous medium has threatened environmental safety, and thereby re- moving them from wastewater in an efficient way is highly desired. Herein, the efficient biosorbents were successfully fabricated via a facile physical gelation process of sodium alginate (SA) and carboxymethyl chitosan (CMCTS) in an acidic aqueous solution. The as-prepared hydrogel beads not only displayed water superabsorbent properties and pH-responsive swelling characters but also exhibited excellent methylene blue (MB) adsorption capacity removal efficiency with experimental maximum MB adsorption capacity of 2518 and 1005 mg g -1 , which are comparable with most reported lignocellulosic and alginate-based hydrogels. The MB adsorption process fitted well in different kinetic and isotherm models and became more heterogeneous in concentrated MB solutions as verified by principal component analysis results. The adsorption mechanism was proposed, and the high dye absorbency was attributed to the strong electro- static forces between adsorbents and adsorbates. Our current study provides a promising and sustainable composite hydrogels platform targeted to dye decontamination.

关键词： Hydrogel Dye adsorption Composites Superabsorbent Sodium alginate Carboxymethyl chitosan

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High day and night temperatures impact on cotton yield and quality——current status and future research direction

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棉花研究(英文) 2023年第3期6卷 209-225页

作者： SAINI Dinesh K. IMPA S.M. MCCALLISTER Donna PATIL Gunvant B. abidi noureddine RITCHIE Glen JACONIS S.Y. JAGADISH Krishna S.V. Department of Plant and Soil Science Texas Tech UniversityLubbockTX 79410USA Department of Agricultural and Applied Economics Texas Tech UniversityLubbockTX 79410USA Institute of Genomics for Crop Abiotic Stress Tolerance Texas Tech UniversityLubbockTX 79410USA Fiber and Biopolymer Research Institute Texas Tech UniversityLubbockTX 79410USA Cotton Incorporated CaryNC 27513USA

Heat waves,and an increased number of warm days and nights,have become more prevalent in major agricultural regions of the *** well adapted to semi-arid regions,cotton is vulnerable to high temperatures,particularly during flowering and boll *** maintain lint yield potential without compromising its quality under high-temperature stress,it is essential to understand the effects of heat stress on various stages of plant growth and development,and associated tolerance *** ongoing efforts to gather data on the effects of heat stress on cotton growth and development,there remains a critical gap in understanding the distinct influence of high temperatures during the day and night on cotton yield and ***,identifying mechanisms and target traits that induce greater high day and night temperature tolerance is essential for breeding climate-resilient cotton for future uncertain *** bridge these knowledge gaps,we embarked on a rigorous and comprehensive review of published literature,delving into the impact of heat stress on cotton yields and the consequential losses in fiber *** review encompasses information on the effects of heat stress on growth,physiological,and biochemical responses,fertilization,cotton yield,and ***,we discuss management options for minimizing heat stress-induced damage,and the benefits of integrating conventional and genomics-assisted breeding for developing heat-tolerant cotton ***,future research areas that need to be addressed to develop heat-resilient cotton are proposed.

关键词： Controlled environment Cotton Fiber yield and quality Heat stress Heat tents Reproductive failure

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Calibration of HVI cotton elongation measurements

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Journal of Cotton Research 2020年第4期3卷 268-277页

作者： DELHOM Christopher D. HEQUET Eric F. KELLY Brendan abidi noureddine MARTIN Vikki B. USDA-ARS New OrleansLA 70124USA Texas Tech University LubbockTX 79409USA Cotton Incorporated CaryNC 27513USA.

Background:The strength of cotton fiber has been extensively studied and significant improvements in fiber strength have been made,but fiber elongation has largely been ignored,despite it contributing to the energy needed to break fibers,which affects fiber handling and *** Volume Instruments(HVI)measure fiber elongation but have not been calibrated for this property,making the measurement unavailable for comparative work among *** prior work,a set of elongation calibration materials had been developed based on Stelometer results.A round trial of ten Australian and *** was conducted on six cotton samples representing a range of 4.9%to 8.1%***:By scaling the HVI elongation values of each instrument to the values of the two calibration samples,the coefficient of variation in instrument measurements was reduced from an average of 34%for the uncalibrated measurements to 5%for the calibrated *** reduction in variance allows for the direct comparison of results among instruments.A single-point elongation calibration was also assessed but found to be less effective than the proposed two-point ***:The use of an effective calibration routine on HVI measurement of cotton significantly reduces the coefficient of variation of the elongation measurement within and between *** implementation of the elongation calibration will allow testing and breeding programs to implement high-speed elongation testing which makes the use of elongation values possible in breeding programs.

关键词： Cotton Elongation High volume instrument Tenacity Work-to-rupture

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AZF microdeletions and partial deletions of AZFc region on the Y chromosome in Moroccan men

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Asian Journal of Andrology 2007年第5期9卷 674-678页

作者： Laila Imken Brahim El Houate Abdelaziz Chafik Halima Nahili Redouane Boulouiz Omar abidi Elbakkay Chadli noureddine Louanjli Abdelouhab Elfath Mohammed Hassar Ken McElreavey Abdelhamid Barakat Hassan Rouba Human Genetic and Cytogenetic Unit Research Department Pasteur Institute of Morocco Ezzahraoui 20100 CasablancaMorocco Laboratory of Anthropogenetic and Biostatistic University Chouaib Doukkali 299 Eljadida 24000 Morocco In Vitro Fecondation Center 40 Rue Prince Moulay Abedelah 20 000 Casablanca Morocco Reproduction Fertility and Population Unit Developmental Biology Department Pasteur Institute 25 Rue Docteur Roux Paris France

Aim： To evaluate for the first time the frequency of Y chromosome microdeletions and the occurrence of the partial deletions of AZFc region in Moroccan men, and to discuss the clinical significance of AZF deletions. Methods： We screened Y chromosome microdeletions and partial deletions of the AZFc region of a consecutive group of infertile men （n = 149） and controls （100 fertile men, 76 normospermic men）. AZFa, AZFb, AZFc and partial deletions of the AZFc region were analyzed by polymerase chain reaction （PCR） according to established protocols. Results： Among the 127 infertile men screened for microdeletion, four subjects were found to have microdeletions： two AZFc deletions and two AZFb＋AZFc deletions. All the deletions were found only in azoospermic subjects （4/48, 8.33%）. The overall AZFc deletion frequency was low （4/127, 3.15%）. AZF microdeletions were not observed in either oligoasthenoteratozoospermia （OATS） or the control. Partial deletions of AZFc （gr/gr） were observed in a total of 7 of the 149 infertile men （4.70%） and 7 partial AZFc deletions （gr/gr） were found in the control group （7/176, 3.98%）. In addition, two b2/b3 deletions were identified in two azoospermic subjects （2/149, 1.34%） but not in the control group. Conclusion： Our results suggest that the frequency of Y chromosome AZF microdeletions is elevated in individuals with severe spermatogenic failure and that gr/gr deletions are not associated with spermatogenic failure.

关键词： Y microdeletions haplogroups gr/gr infertility bi-allelic markers

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