检索结果-南通市图书馆

Farmers’ Knowledge and Awareness towards the Use of Agrochemicals in Vegetable Cultivation, Fako Cameroon

在线全文

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2024年第9期12卷 215-229页

作者： Amungwa Ivan Tabikam veronica Ebot Manga Godswill Azinwie Asongwe Elmer Kanjo Ekinzog Mantah Marian Ngwatezeh Victorine Neh Akenji Department of Environmental Science University of Buea Buea Cameroon Institute of Agricultural Research and Development (IRAD) Batoke-Limbe Cameroon GAP AG Munich Germany GIS and DTM Assistant IOM-UN Yaound Cameroon South West Regional Center for Scientific Research and Innovation Buea Cameroon

Agrochemicals are contemporary, omnipresent tool used in vegetable cultivation. Farmers’ knowledge and awareness of the proper usage of agrochemicals are critical for mitigating the negative effects on human health. This cross-sectional study was aimed at assessing the usage knowledge, risk awareness of toxicological and chemical classes, proper handling and use practices for agrochemicals homologated for use in vegetable farming, and the occurrence of health-related symptoms as a result of exposure among these farmers. The study included 93 vegetable growers from agricultural hotspot towns in Fako, southwest Cameroon. The field study, ran from November 2021 to December 2023, using a questionnaire to collect information on farmers demographic, and their knowledge of pesticide classes, and the related risk of associated with the handling of agrochemicals. Results show that all vegetable farmers, particularly those engaged in agribusiness, employ pesticide inputs to maximize production. Six pesticides, two fertilizer types, and one unknown substance were identified. While 23 active compounds were found, the most utilized were abamectin, emamectin (10.46%), dimethoate (9.30%,) and ethoprophos (8.13%). Two active chemicals, dimethoate and methalaxyl, are illegal yet remain in circulation. Toxicological classes I and II, with the greatest harmful effect on human health, were the most commonly utilized (64.27%). Thirty-nine percent of farmers never use personal protection equipment when working with agrochemicals, demonstrating a significant gap in knowledge and awareness of agrochemicals and their various applications and handling procedures in the field. The government should implement an intensive specialized educational program for on-field farmers with incentives in order to promote sustainable agriculture methods that ensure environmental and human safety.

关键词： Farmers Knowledge Agrochemical Risk Awareness Vegetable Cultivation Agrochemical Use Practices Health Risk

Insight into atmospheric corrosion evolution of mild steel in a simulated coastal atmosphere

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第17期76卷 41-50页

作者： Yue Wang Xin Mu Junhua Dong Aniefiok Joseph umoh Wei Ke Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Environmental Corrosion Centre of Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The corrosion behavior of mild steel in a simulated coastal atmosphere environment has been investigated by the indoor accelerated wet/dry cyclic corrosion acceleration test(CCT),scanning electron microscopy(SEM),Raman spectroscopy and electrochemical *** the CCT test of 60 cycles,the evolution of logarithmic(corrosion rate)***(CCT cycles)presents a turning point at the 5th cycle,presenting a tendency to increase first and then decrease to gradually stabilize as the CCT cycle *** the 5th cycle,γ-FeOOH andβ-FeOOH and Fe_(3)O_(4)were detected,*** then,α-FeOOH as a new chemical composition was detected in the subsequent corrosion *** is found that,after long term corrosion,the rust separated into a relatively dense inner layer rich withα-FeOOH and a loose outer layer rich withγ-FeOOH,both of which have poor electrical *** rapid increase of corrosion rate in the early stage since reducible corrosion products are involved in the reduction process of the cathode which promotes the dissolution of the anodic metal ***,as the rust layer thickens,the resistance of the rust increases,and the aggressive ions diffusion is blocked,gradually suppressing the electrochemical corrosion *** last,when the composition and distribution of the rust layer remain stable,the corrosion presents a fluctuating speed around a certain value during the cracking and self-repairing process of the rust layer.

关键词： Mild steel Coastal atmospheric corrosion Raman spectroscopy Rusting evolution EIS

Sigma-1 receptor:a potential new target for Parkinson's disease?

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2014年第21期9卷 1882-1883页

作者： veronica Francardo Basal Ganglia Pathophysiology Unit Department of Experimental Medical ScienceBMC F11Lund UniversityLundSweden

Parkinson＇s disease （PD） is an age-related neurodegenerative disorder characterized by typical motor signs and symptoms that are due to dopamine （DA） depletion in the basal ganglia. The treatment of PD is symptomatic, and aims at replacing the lost DA input using either L-DOPA or DA agonists. The causes of PD are unknown in approximately 90% of the cases, whereas about 10% of the cases are familial and imputable to mutations in a handful of genes （the gene mutations with the strongest association with PD are shown in Table 1; for a detailed review see （Poulopoulos et al., 2012））. The genetic forms of PD have spurred an intense research on molecular pathways of neurodegeneration that converge on proteostatic deficits, mitochondrial dysfunction and oxidative stress.

关键词： Sigma-1 receptor PARK

Axonal tuning by GABA_(A) receptor unveils novel tricks from an old dog

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2023年第3期18卷 533-534页

作者： veronica Bonalume Valerio Magnaghi Department of Pharmacological and Biomolecular Sciences Universitàdegli Studi di MilanoMilanItaly

In the last years,axonal conductance of action potential trains became a novel subject of study,changing the view of axons,from a static cable-like compartment to a more complex and dynamic system(Debanne et al.,2011).Axonal computation,indeed,is canonically constituted by the action of voltage-gated ion channels,such as the classic Na+and K+channels,but recent studies demonstrated that it can be modulated by the action of other ion channel pumps,and metabolic factors(Byczkowicz et al.,2019;Zang and Marder.

关键词： tuning action classic

Sensitivity of a solid Eu(Ⅲ) complex towards acetonitrile vapor:Structural and spectroscopic characterization

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2020年第5期38卷 571-576页

作者： Fabio Piccinelli veronica Paterlini Magda Monari Marco Bettinelli Luminescent Materials Laboratory DBUniversita di Veronaand INSTMUdR VeronaStrada Le Grazie 1537134VeronaItaly Dipartimento di Chimica"G.Ciamician" Universita di BolognaVia Selmi 240126BolognaItaly

The Eu(Ⅲ)nitrate complex of the meso-N,N’-bis(2-pyridylmethylene)-1,2-(R,S)-cyclohexanediamine ligand was synthesized and characterized by single crystal and powder X-ray *** crystal lattice of the complex is capable of absorbing and desorbing selectively acetonitrile molecules,at 293 K upon an acetonitrile vapor pressure of^0.1×10^5 *** process,which is partially reversible,can be easily followed by both powder X-ray diffraction(P-XRD)and Eu(III)luminescence *** acetonitrile molecule,located in the outer coordination sphere of the metal ion,does not affect the radiative transition probability of 5 D0 level of Eu(Ⅲ)and also it does not activate further non-radiative channels from this *** the other hand,this molecule is capable of affecting the energy position and intensities of the crystal field components of the 5 D0→7 F2 *** complex in solid form can be considered a promising material for the optical sensing of acetonitrile vapors.

关键词： Eu(Ⅲ) X-ray diffraction Crystal structure Luminescence spectroscopy Rare earths

Effect of organic silicon quaternary ammonium salts on mitigating corrosion of reinforced steel induced by SRB in mild alkaline simulated concrete pore solution

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第5期64卷 126-140页

作者： Ini-Ibehe Nabuk Etim Junhua Dong Jie Wei Chen Nan Durga Bhakt Pokharel Aniefiok Joseph umoh Dake Xu Mingzhong Su Wei Ke Environmental Corrosion Centre Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences 19A Yuquan Road Shijingshan DistrictBeijing 100049China Department of Marine Biology Akwa Ibom State UniversityP.M.B.1167UyoNigeria School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Sani-care Salon Products Inc.USA

The corrosion damage of 20 SiMn steel by sulphate-reducing bacteria(SRB)and the mitigation effect of organic silicon quaternary ammonium salt(OSA)were studied in sterilized mild alkaline simulated concrete pore solution(STR)with different additions of SRB and OSA at pH 9.35 for 28 *** corrosion occurs in STR medium while slight localized corrosion is observed in STR+OSA medium,and localized pitting corrosion occurs in STR+SRB and STR+SRB+OSA *** largest pit depth reduces from 36.70μm in STR+SRB medium to 3.31μm in STR+SRB+OSA medium due to the mitigation effect of *** corrosion rate reflected by weight loss and electrochemical impedance spectroscopy(EIS)results presents the order of STR

关键词： Steel reinforced concrete Microbial corrosion Biocide EIS

The synergy between cementite spheroidization and Cu alloying on the corrosion resistance of ferrite-pearlite steel in acidic chloride solution

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第25期84卷 65-75页

作者： Hu Liu Jie Wei Junhua Dong Yangtao Zhou Yiqing Chen Yumin Wu Subedi Dhruba Babu Aniefiok Joseph umoh Wei Ke Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan114009China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China

In this work,the corrosion behavior of medium-carbon steels(45,45 Cu and 45 Cuq steels)in acidic chloride environment was *** results indicated that the micro-galvanic effect between the anodic ferrite matrix phase and the cathodic cementite secondary phase notably affected the corrosion resistance of the three *** 45 steel,serious pitting corrosion happened in and around the pearlite regions,and a large number of lamellar cementite was fixed in the corrosion ***,the continuously increasing superficial area of cathodic cementite enhanced the micro-galvanic corrosion,resulting in a rapidly increase in corrosion rate with *** for 45 Cu and 45 Cuq steels,macroscopic uniform corrosion occurred,and the cementite accumulation was markedly reduced as compared with 45 steel,thus the micro-galvanic effect was weakened and the corrosion rate was decreased *** these,45 Cuq steel showed the most stable and excellent corrosion resistance during long-term corrosion,indicating the occurrence of a synergistic effect between cementite spheroidization and Cu alloying,thereby significantly improving the corrosion resistance of 45 steel.

关键词： Cementite spheroidization Cu alloying Ferrite-pearlite steel Micro-galvanic effect

Effect of D-fructose on the in-vitro corrosion behavior of AZ31 magnesium alloy in simulated body fluid

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第7期66卷 202-212页

作者： Durga Bhakta Pokharel Liping Wu Junhua Dong Xin Wei Ini-Ibehe Nabuk Etim Dhruba Babu Subedi Aniefiok Joseph umoh Wei Ke Shenyang National Laboratory for Materials Science(SYNL) Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Material Science and Engineering University of Science and Technology of ChinaHefei230026China Department of Marine Biology Akwa Ibom State UniversityUyoNigeria

The effect of addingd-fructose to simulated body fluid(SBF) on the corrosion behavior of AZ31 magnesium(Mg) alloy at 37.C and at a pH of 7.4 was studied by potentiodynamic polarization(PDP), electrochemical impedance spectroscopy(EIS), potentiostatic polarization and hydrogen(H2) collecting techniques,Raman spectroscopy technique, scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), X-ray diffraction(XRD), X-ray photoelectron spectroscopy analysis(XPS) and Fourier transformed infrared(FTIR). The results demonstrated that the addition of fructose enhanced the deposition of phosphates forming thick and compact corrosion products, which inhibited the transmission of aggressive ions into the Mg substrate. As a result, both the anodic dissolution of Mg and negative difference effect(NDE) were suppressed. Thus, the corrosion resistance of AZ31 Mgalloy in SBF was significantly improved.

关键词： AZ31 Mg alloy D-Fructose SBF EIS Hydroxyapatite

Surrogate potency assays:Comparison of binding profiles complements dose response curves for unambiguous assessment of relative potencies

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2018年第2期8卷 138-146页

作者： Robert Karlsson veronica Fridh Asa Frostell Purification and Analysis GE Healthcare Life SciencesUppsalaSweden

Surface plasmon resonance(SPR) systems are widely used for detailed characterization of antibody activities including antigen and Fc-receptor binding. During the later stages of development, where the focus is to ensure that established critical quality attributes(CQAs) are maintained during cell culture,purification and formulation processes, analysis is simplified, and relative potencies are often determined. Here, simulation of binding data revealed that relative potency values, determined via parallel line analysis(PLA) and half maximal effective concentration(EC50) analysis accurately reflect changes in active concentration only if binding kinetics remain unchanged. Changes in the association rate constant shifted dose response curves, and therefore relative potencies, in the same way as changes in analyte concentration do. However, for interactions characterized by stable binding, changes in the dissociation rate constant did not result in any shift, suggesting that this type of change may go unnoticed in the dose response curve. Thus, EC50 and PLA analyses of dose response curves obtained with an anti-TNF-α antibody were complemented with the Biacore functionality for sensorgram comparison analysis, whereby changes in antigen and Fc-receptor binding profiles could be detected. Next, analysis of temperature stressed TNF-α antibody revealed that calibration free concentration analysis(CFCA) data correlated perfectly with relative potency values. Together, these results demonstrate that combinations of SPR based dose response curves, sensorgram comparison and CFCA can be used to strengthen the confidence in relative potency assessments, and suggest that SPR can potentially be used as a surrogate potency assay in the quality control of biotherapeutic medicines.

关键词： Surface plasmon resonance EC50 Sensorgram comparison Calibration free concentration analysis Surrogate potency assay TNF-a