检索结果-南通市图书馆

Isolation and characterization of ingenol esters from Euphorbia cornigera

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第4期22卷 451-454页

作者： Imam Bakhsh baloch musa kaleem baloch Department of Chemistry Gomal UniversityDera Ismail KhanPakistan

Methanolic extract of Euphorbia cornigera *** HPLC separation yielded three new *** structures and relative stereochemistry were established through 2D-NMR spectroscopic measurements.

关键词： Euphorbiaceae Euphorbia cornigera 2D NMR of 13-acyloxyingenol

Miscibility between PS and PSAN Affected by Solvent and Temperature of the System

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2014年第11期32卷 1442-1449页

作者： Zafarullah Khan Marwat musa kaleem baloch Department of Chemistry Gomal University Dera Ismail Khan Khyber PakhtoonkhwaPakistan

The influence of solvent on the miscibility of polystyrene（PS） and poly（styrene-co-acrylonitrile）（PSAN） blends has been investigated viscometrically. The miscibility of different PS/PSAN blend（30/70, 50/50 and 70/30） compositions in acetone and benzene at 20, 30, and 40 °C was investigated on the basis of the sign of Chee（ΔB and ）, and Sun’s（α） criteria. The values of these parameters were evaluated from the analyses of reduced viscosity data of binary（solvent/polymer） and ternary（solvent/polymer1/polymer2） polymer systems. These investigations indicated partial miscibility for both the blend systems. However, PS/PSAN/acetone blend system showed somewhat higher partial miscibility than the PS/PSAN/Benzene blend system highlighting the impact of solvent over the polymer-polymer interactions and hence their miscibility. The results obtained through viscometry were also corroborated by the refractive index and density results for the blends under study. The effect of temperature on miscibility in both the cases was almost negligible.

关键词： Miscibility Polystyrene Poly(styrene-co-acrylonitrile) Viscosity Density Refractive index.

SOLVENT QUALITY AND SOLUTION BEHAVIOR OF NYLON 12

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2007年第5期25卷 483-490页

作者： musa kaleem baloch Munaza Qayum Mohsin Nawaz Sher Akber Department of Chemistry Gomal University Dera Ismail Khan Pakistan Department of Chemistry Balochistan University Queta Pakistan

The refractive index increment, dynamic and static laser light scattering, intrinsic viscosity [η] and Huggins constant （KH） of nylon 12 have been measured in m-cresol and sulphuric acid/water system at 10-60℃. The intrinsic viscosity, Rn, Rg, A2, and （〈 S 〉2）^1/2 （calculated from viscosity data） and ＂a＂ values of nylon 12 are found to be higher in m-cresol than in sulphuric acid. All these parameters decrease with the increase in water contents in sulphuric acid. The refractive index increment, KH and activation energy show an opposite trend to that of [η]. The intrinsic viscosity, RH, Rg, A2, and （〈 S 〉2）^1/2 have maximum values around 30-40℃ in sulphuric acid/water system, whereas in m-cresol they fall at about 20℃. It has been concluded that the variation in size, interaction parameter （second virial coefficient）, [η] and KH of the polymer solutions with the alteration in solvent composition and temperature are the out come of change in thermodynamic quality of solvents, selective adsorption, hydrogen bonding and conformational transitions. It has also been concluded that the increase in temperature first enhances the quality of the solvent, encourages hydrogen bonding and specific adsorption, and then deteriorates, bringing conformational transitions in the polymer molecules. However, the addition of water to sulphuric acid continuously deteriorates the solvent quality. This characteristic of the solvent system brings conformational changes in the polymer especially at low temperatures.

关键词： Static and dynamic light scattering Refractive index increment Intrinsic viscosity Huggins constant Thermodynamic quality of solvent Radius of gyration Hydrodynamic radius Conformational changes.

Characteristic spectral studies and in vitro antifungal activity of some Schiff bases and their organotin (Ⅳ) complexes

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2004年第2期49卷 119-122页

作者： Wajid Rehman musa kaleem baloch Bakhtiar Muhammad Amin Badshah Khalid M.Khan Department of Chemistry Gomal University Dera Ismail KhanPaki-stanDepartment of Chemistry Gomal UniversityDera Ismail KhanPaki-stanDepartment of Chemistry Gomal UniversityDera Ismail KhanPaki-stanDepartment of ChemistryQuaid-e-Azam UniversityIslamabadPaki-stanHEJ Research Institute University of KarachiPakistan

The synthesis and in vitro antifungal activity of some Schiff bases and their Sn (Ⅳ) complexes has been tested against plant pathogenic fungi and it is found that they possess excellent fungicidal activity. On the basis of ^1H-, ^13C-,^119Sn NMR-, ^119Sn Mǒssbauer, IR and Elemental analysis the tetrahedral geometry is proposed for the synthesized compounds.

关键词：特征光谱抗真菌活性有机锡有机金属化合物

A STUDY OF GENOTYPIC FREQUENCY OF VARIOUS BLOOD GROUP ALLELES

在线全文

学校读者我要写书评

暂无评论

A STUDY OF GENOTYPIC FREQUENCY OF VARIOUS BLOOD GROUP ALLELE...

Status of Cadmium Concentration in Soil and Vegetable Irrigated with City Effluent

The 1st Session of 2004 Workshop of Pakistan Academy of Sciences

作者： Mohammad Shoaib Khan Faheem Tahir Mubashir Ahmed Sheikh Fazli Subhan Birjees Mazhar Kazi Athar Saeed Dil Fariyal Deepa Sikandar Sultan Irshad Ali musa kaleem baloch Public Health Division National Institute of HealthIslamabadPakistan Department of Clinical Pathology Jinnah Postgraduate Medical CentreKarachiPakistan Department of Chemistry Gomal UniversityD.I. KhanPakistan

A random population sample from urban and rural areas of Bannu region, Northwest Frontier Province（NWFP） of Pakistan was screened for distribution of blood groups. The objective was to identify the genotypic frequency of blood groups in the region, in order to comprehend the allelic diversity. Blood grouping was carried out over a period of 16 months from January 2002 to April 2003, and encompassed 2581 subjects, in which 57.09% were male and 42.9% female. These were categorized according to ABO/Rh system. Allele frequency was computed according to HardyWeinberg law. The distribution of phenotypes in the total sample was 0.3623, 0.3103, 0.2507 and0.0767 for groups B, A, O and AB, respectively, with 0.672 Rh-positive（R） and 0.328 Rh-negative（r）. B group was dominant in both the genders, and AB was rare in both males as well as females. The distribution of the alleles in the total sample was 0.345, 0.378 and 0.277 for I A, I B and i, *** studied population exhibited a predominance of group B, in the order of B＞A＞O＞AB, as well as Rh-positive antigen for both male（90.26%） and female（87.98%） subjects within the population,with Rh-negative men and women being 9.74% and 12.02% respectively.

关键词： Alleles gene frequency blood groups Rh factor transfusion Bannu Pakistan

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

应用与环境生物学报 2006年第3期12卷 414-419页

作者： FARID Sajid baloch musa kaleem AKHTAR Kanwar Saleem Department of Chemistry Gomal UniversityDera Ismail KhanPakistan Department of Chemical Engineering NFC Institute of Engineering and Fertilizer ResearchFaisalabadPakistan

Cadmium(Cd) is a toxic and carcinogenic element,and it causes different diseases for people like sever nausea,salivation vomiting,diarrhoea,abdominal pain and neuralgia when it comes into food chain at excessive *** is also not included in the micronutrients for plant *** to arid and semi arid conditions of Pakistan,rainfall is small,causing shortage of irrigation *** of this shortage,farmers largely use city effluents for raising vegetables in the areas around big cities,which are contaminated with industrial *** effluents from Pakistan third largest city(Faisalabad) are used as supplementary irrigation water to produce vegetables for human *** paper reports a study on assessment of risks and opportunities associated with this practice,with emphasis on Cd,which can enter the food chain as an impurity in *** and other elements were measured in some typical effluents,four types of soils and many vegetables with no fertilizer *** was found that the municipal effluents increased soil salinity,sodicity and Cd *** Cd concentration in the vegetables was high above those normally associated with suitability for human *** were suggestions that soluble Cd concentration in the effluents could be lessened by adding lime,concurrently lowering the sodium adsorption ratio and residual sodium carbonate of the effluents,thus making them safe for utilization on agricultural soils.(Fig 1),Tab 7,Ref

关键词：镉耕种土壤蔬菜城市污水费萨那巴德巴基斯坦

Monte Carlo Study of CO-NO Catalytic Surface Reaction Including CO-CO Repulsion

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2006年第4期23卷 1034-1037页

作者： Waqar Ahmad musa kaleem Baloach Physics Research Division Pakistan Institute of Nuclear Science and Technology PO Nilore Islamabad Pakista Department of Chemistry Gomal University D.I. Khan Pakistan

The CO-NO reaction on a catalytic surface is studied by using Langmuir-Hinshclwood thermal mechanism with Monte Carlo computer simulation. In this model, a novel concept of CO CO repulsion is introduced, which has experimental evidence due to the formation of dipoles when these molecules are chemisorbed on the surface. The system is investigated by applying two approaches of NO dissociation. In the first ***, NO always decomposes into N and O before adsorption on the surface, In the second case, NO adsorbs on the surface molecularly and then dissociates into N and O if a vacancy is present in its adjacent neighbourhood. The steady state reactive window （i.e. the continuous production of CO2 and N2） is obtained only with the diffusion of N-atoms on the surface, which extends with CO-CO repulsion in the first, case. Itowever, in the second case, reactive window is obtained with CO-CO repulsion alone, The reactive window width in this case is reasonably large. The first-order phase transition is eliminated in both the cases with CO-CO repulsion.

关键词： KINETIC PHASE-TRANSITIONS SQUARE LATTICE HEXAGONAL SURFACES REACTIONMODEL NITRIC-OXIDE SIMULATION MECHANISM