Pakistan Journal of Chemistry最新文献_第9页

GC-Mass Spectrokinetics Study of Probable Mechanism of the Oxidation of Diethylthiourea with Toluidine Blue 甲苯胺蓝氧化二乙基硫脲可能机理的gc -质谱动力学研究

Pakistan Journal of Chemistry Pub Date : 2014-03-30 DOI: 10.15228/2014.V04.I01.P07

M. Qadri, F. Uddin, R. Azmat

{"title":"GC-Mass Spectrokinetics Study of Probable Mechanism of the Oxidation of Diethylthiourea with Toluidine Blue","authors":"M. Qadri, F. Uddin, R. Azmat","doi":"10.15228/2014.V04.I01.P07","DOIUrl":"https://doi.org/10.15228/2014.V04.I01.P07","url":null,"abstract":"Thecurrent study describes the interactive role of diethylthiourea on the bleaching of toluidine blue (tolonium chloride) (TB) in acidic and basic media using the GC Mass Chromatography and Spectrophotometric technique. GC-Mass Spectrophotometric analysis was carried out to verify the decoloration of dye whether the bleaching of dye owed to leuco dye formation or degradation may also occur in the reaction mixture. The dye redox reaction process followed first order kinetics with respect to TB, DETU showed first order mechanism, first order kinetics with respect to H. Enhanced decoloration in the presence of DETU proved that reductant‘s role is pivotal in the redox reaction. Slow decoloration in basic medium with ions was seen compared to acidic media, suggesting that pH of the medium is significant in the oxidation of DETU. The bleaching reaction of dye was investigated at different temperatures. At pH of 1.0 and 25C, the order of reaction is found to be second having rate constant value of 15.81 mol.L s,and rate law is suggested to be -d/dt [TBH ] = k2 [TB + H][DETU].Different reaction energy parameters were evaluated for a TB-DETU reaction, including the energy of activation (Ea = 60.786 kJmol -1 (basic medium), 1.669kJmol (acidic medium)), enthalpy of activation (∆H ≠ = -58.267 kJ mol -1 (basic medium), -12.6kJ mol -1 (acidic medium)), entropy of activation (∆S = -131.525JmolK(basic medium),-243 JmolK(acidic medium)),and free energy of activation (∆G = 98.119kJmol (basic medium) and -86.55kJmol (acidic medium). A mechanism of interaction of involved ions in dye bleaching and a mechanism of oxidation based on the above findings is proposed.","PeriodicalId":19815,"journal":{"name":"Pakistan Journal of Chemistry","volume":"779 1","pages":"39-48"},"PeriodicalIF":0.0,"publicationDate":"2014-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82495031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Chemical Composition of Lignitic Humic Acid and Evaluating its Positive impacts on Nutrient Uptake, Growth and Yield of Maize 木质素腐植酸的化学组成及其对玉米养分吸收、生长和产量的积极影响

Pakistan Journal of Chemistry Pub Date : 2014-03-28 DOI: 10.15228/2014.V04.I01.P04

M. Z. Khan, M. Akhtar, S. Ahmad, A. Khan, R. Khan

{"title":"Chemical Composition of Lignitic Humic Acid and Evaluating its Positive impacts on Nutrient Uptake, Growth and Yield of Maize","authors":"M. Z. Khan, M. Akhtar, S. Ahmad, A. Khan, R. Khan","doi":"10.15228/2014.V04.I01.P04","DOIUrl":"https://doi.org/10.15228/2014.V04.I01.P04","url":null,"abstract":"Lignite derived humic acid (HA), obtained from Thar coal mines were extracted by 0.5 N KOH; characterized and used to evaluate its impact on maize yield and soil health. Having highest HA recovery (20%) black coal derived HA were applied in different level [(@ no HA (HA0), 25 (HA1) and 50 (HA2) mg kg -1 soil)] in conjoint with different nitrogen (N) levels [no N application (N0) (150 (N1) and 300 (N2) mg kg -1 ]. Results showed that plant fresh biomass increased by 23% and 44% with application of HA at HA1 and HA2 respectively, about 23% increase was observed in dry plant biomass at both the HA levels. Cob weight and grain weight increased significantly (29% and 40%) with HA at 25 and 50 mg kg -1 respectively vis as vis control (no HA applied), with N at 150 and 300 mg kg -1 the increase was 51% and 103%. The grain weight increased by 12% and 41% with HA1 and HA2 whereas, 31 % and 43 % with N application (N1 and N2 over the control). The HA application increased plant N contents by 20% and 26 %, P by 14% and 20% and K by 15% and 10% in HA1 and in HA2, respectively. Nutrient uptake also enhanced with both N and HA application. From the results it can be concluded that HA application along with N help improved growth, yield and nutrient uptake by maize.","PeriodicalId":19815,"journal":{"name":"Pakistan Journal of Chemistry","volume":"27 1","pages":"19-25"},"PeriodicalIF":0.0,"publicationDate":"2014-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88770842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Improved Gas-Sensing Properties of Graphene-CoFe2O4 Composite Prepared via Homogeneous Precipitation 均匀沉淀法制备改善气敏性能的石墨烯- cofe2o4复合材料

Pakistan Journal of Chemistry Pub Date : 2014-03-26 DOI: 10.15228/2014.V04.I01.P03

Feng Liu, X. Chu

引用次数: 0

Irinotecan and Bevacizumab in Glioblastoma-A Review 伊立替康和贝伐单抗治疗胶质母细胞瘤a综述

Pakistan Journal of Chemistry Pub Date : 2014-03-22 DOI: 10.15228/2014.V04.I01.P01

S. Khair-ul-Bariyah, M. Shahid

引用次数: 0

Synthesis and Screening of Some New N-Substituted Derivatives of N-(4-Methylpyridin-2-yl)benzenesulfonamides as Potential Antibacterial Agents 新型N-(4-甲基吡啶-2-基)苯磺酰胺N取代衍生物的合成与筛选

Pakistan Journal of Chemistry Pub Date : 2014-03-22 DOI: 10.15228/2014.V04.I01.P02

Aziz‐ur‐Rehman

引用次数: 1

Effects of Chicken Manure and Mineral Fertilizer on Some Nutritive Parameters and Lead Accumulation in Two Vigna Species Grown in Lead Contaminated Soil 鸡粪和矿肥对铅污染土壤中两种维纳草某些营养参数及铅积累的影响

Pakistan Journal of Chemistry Pub Date : 2013-12-30 DOI: 10.15228/2013.V03.I04.P08

F. Jawaid, N. Hamid

引用次数: 0

Synthesis and Antibacterial Activity of N-(un)substituted-N- ((3,4-Methylenedioxyphenyl)methyl)arylsulfonamides N-(非)取代-N-((3,4-亚甲二氧苯基)甲基)芳基磺酰胺的合成及抑菌活性研究

Pakistan Journal of Chemistry Pub Date : 2013-12-30 DOI: 10.15228/2013.V03.I04.P01

Aziz‐ur‐Rehman, A. Siddiqa, M. Abbasi, S. Rasool, K. Nafeesa, Samreen Gul, Irshad Ahmed, S. Afzal

引用次数: 1

Synthesis of Some New 2-Mercapto/Hydrizino 5, 6, 7, 8 - Tetrahydro Quinazoline Derivatives as In-Vitro Anthelimentic Agents 新型2-巯基/水合5,6,7,8 -四氢喹唑啉类体外抗虫剂的合成

Pakistan Journal of Chemistry Pub Date : 2013-12-30 DOI: 10.15228/2013.V03.I04.P02

P. Srikumar, T. Lakshmi, K. Sekhar

引用次数: 0

Antitumor Activity of New Quinoxaline Analogues and Its Complexes 新型喹啉类似物及其配合物的抗肿瘤活性

Pakistan Journal of Chemistry Pub Date : 2013-12-30 DOI: 10.15228/2013.V03.I04.P06

N. Yousif, A. A. Ismaeel, K. Ali, F. Mousa

{"title":"Antitumor Activity of New Quinoxaline Analogues and Its Complexes","authors":"N. Yousif, A. A. Ismaeel, K. Ali, F. Mousa","doi":"10.15228/2013.V03.I04.P06","DOIUrl":"https://doi.org/10.15228/2013.V03.I04.P06","url":null,"abstract":"This study shows synthesis of a new quinoxaline derivatives (LH) and preparation of copper (Cu-LH) and cobalt (Co-LH) complexes and studying the effect of these compounds on the activity of lactate dehydrogenase (LDH) a primary enzyme to the process of anaerobic glycolysis which is the source of energy in tumor cell. This study included of 40 women with recently diagnosed of malignancies Breast cancer; (20) subject women in stage I&(20)subject women in stage II who were admitted to Medical City Hospital with age ranged (37-45) years and 30 apparently healthy woman matched for age served as controls. Serum LDH activity was assayed on the time of the diagnosis in all cases and after addition of different concentrations (10 -1 , 10 -2 , 10 -3 ) of quinoxalin derivatives and transition metals complexes in vitro. The results revealed an inhibitory effect of LH and its complexes with Cu and Co in all concentrations used in this study on LDH activity. The inhibition percent’s increased with increase concentration for LH and its complexes. Also the results reveal that the inhibitory effect of LH in all concentrations used were more than inhibitory effect of its complexes. Moreover the inhibitory effect of LH-Co complex was more than inhibitory effect of LH-Cu complex in all concentrations used. The inhibition ability of quinoxaline derivative and its complexes on the enzyme lactate dehydrogenase leads to the fact that these compounds can be characterized as an active anti –cancer substances for one of the metabolic enzymes necessary to feed the cancer cells. Keyword: breast cancer, quinoxaline derivatives, copper and cobalt complexes, lactate dehydrogenase","PeriodicalId":19815,"journal":{"name":"Pakistan Journal of Chemistry","volume":"38 1","pages":"177-181"},"PeriodicalIF":0.0,"publicationDate":"2013-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90450355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A Short Study to Test the Compliance of Various Pakistani Ordinary Portland Cements with ASTM Composition Standards 测试各种巴基斯坦普通硅酸盐水泥符合ASTM成分标准的简短研究

Pakistan Journal of Chemistry Pub Date : 2013-12-30 DOI: 10.15228/2013.V03.I04.P04

Phool Shahzadi, Akhtar Shahnaz, M. S. Khan, B. Rana, M. Y. Chaudry, S. Yasmeen

引用次数: 1