In this thesis, we studied the structural and magnetic properties of uncoated and coateded ferrite nanoparticles (NPs). Cobalt ferrite (CoFe2O4), maghemite (γ-Fe2O3) and manganese ferrite (MnFe2O4) NPs were preferred due to their potential use in wide range of applications including magnetic fluids, catalysis, biotechnology/biomedicine, magnetic resonance imaging, magneto optical devices, data storage, and environmental remediation. To avoid agglomeration and interparticle interactions and study surface effects in these ferrite NPs, different coating materials such as SiO2 (non-magnetic), Co3O4 (antiferromagnetic) and ZrO2 (non-magnetic) were used. The nature of surface coated material can influence the surface magnetization and modify the interparticle interactions. Initially, SiO2 coated and uncoated CoFe2O4 NPs were prepared by using solgel method. X-ray diffraction (XRD) technique revealed the spinel structure of CoFe2O4 NPs. The average crystallite size was found to be 34 and 25 nm for uncoated and 60 % SiO2 coated CoFe2O4 NPs, respectively. The SiO2 remains amorphous at annealing temperature of 900oC. TEM micrographs revealed spherical NPs with less agglomeration. Surface effects were studied by using AC and DC magnetic measurements. Dynamic scaling law fitting on frequency dependent average blocking temperature (TB) of uncoated CoFe2O4 NPs showed weak spin glass behavior with critical exponent value zv = 4. SiO2 coated CoFe2O4 NPs showed two peaks: blocking at high temperature and freezing at low temperature in imaginary part of frequency dependent AC-susceptibility. The dynamic scaling law fitting on frequency dependent freezing peak in coated NPs showed strong spin-glass state with critical exponent zv = 7 due to stiffed frozen surface spins. However, the blocking peak did not follow the thermal activation. DC field in AC-susceptibility shifted the blocking peak and broadened the freezing peak which also confirmed the existence of spin glass in SiO2 coated CoFe2O4 NPs. We have also prepared CoFe2O4 NPs with ZrO2 and TiO2 coating materials and compared their saturation magnetization (MS) values. M-H loops of SiO2, ZrO2 and TiO2 coated CoFe2O4 NPs revealed that ZrO2 coating reduced more magnetization than SiO2, and TiO2 coating materials. ere studied. XRD confirmed the spinel structure of γ-Fe2O3 NPs with phase of ZrO2. Simulated zero field cooled and field cooled (ZFC/FC) curves gave larger Keff = 1.5 ± 1 x 105 erg/cm3 than Kbulk due to enhanced surface effects by ZrO2 coating. Temperature dependent MS was examined by Bloch‘s law. Bloch‘s constant (B) = 2x10-01 K-b for ZrO2 coated γ-Fe2O3 NPs was higher as compared to SiO2 coating due to weak exchange coupling. Coercivity (HC) of SiO2 and ZrO2 coated γ-Fe2O3 NPs showed increasing trend as decrease in temperature due to enhanced surface anisotropy. Uncoated and SiO2 coated γ-Fe2O3 NPs showed slow spin relaxation due to stronger surface disorders as investigated by stretched exponential law. However, ZrO2 coated γ-Fe2O3 NPs showed weak interactions among NPs and reduced surface effects which were examined by frequency dependent AC-susceptibility data. Finally, surface effects in ZrO2 and Co3O4 coated MnFe2O4 NPs were studied. Simulated ZFC/FC measurement showed larger Keff value of Co3O4 coated MnFe2O4 NPs as compared to ZrO2 coated due to strong coupling between ferrimagnetic (FiM) core and antiferromagnetic (AFM) surface. Bloch‘s law fit showed higher value of B = 0.06 K-b for ZrO2 coating due to decreased in exchange coupling caused by ZrO2 coating. DC field and frequency dependent AC-susceptibility data were analyzed by using Arrhenius, Vogel-Fulcher and dynamic scaling laws for these NPs. Co3O4 coated NPs showed a strong spin glass behavior while ZrO2 coating reduced the interactions between NPs as obtained to ZrO2 coated γ-Fe2O3 NPs. In summary, ZrO2 coating reduced the interparticle interactions between MnFe2O4 and γ-Fe2O3 NPs and also reduced surface effects. However, SiO2 and Co3O4 coating enhanced surface spin disorder and interparticle interactions. Different types of coating can tune the magnetic properties of these ferrite NPs tremendously which make them useful for different applications such as for data storage, hyperthermia cancer treatment, microwave absorber etc.
آہ! مولانا عبداﷲ عباس ندوی مرحوم ۱۰؍ دسمبر کے ’’تعمیر حیات‘‘ سے معلوم ہوا کہ مولانا عبداﷲ عباس ندوی اب روبہ صحت ہیں، اسی شمارے میں پروفیسر عبدالحلیم ندوی مرحوم کے متعلق خود مولانا کا ایک تعزیتی مضمون بھی نظر سے گزرا جس میں انہوں نے لکھا کہ پروفیسر مرحوم ان سے ایک سال سینئر اور مولانا معین اﷲ ندوی کے ہم درس تھے، ساتھ میں مولانا ظہور پرتاب گڑھی، مولانا عبدالغفار ندوی اور مولانا ابوالعرفان خاں ندوی بھی تھے، ان احباب کو یاد کرتے ہوئے لکھا کہ اب شائد ہی کوئی اس گروہ میں باقی رہا ہو، جو زندہ ہیں وہ کشتہ تیغ حیات ہیں، ان سطروں کو پڑھتے وقت کیا خبر تھی کہ کشتگان تیغ اجل کی مرثیہ خوانی کرنے والے کا ماتم اس قدر جلد کیا جائے گا، مولانا عرصے سے بیمار تھے اور ایک دن مخدوم گرامی مولانا تقی الدین ندوی کے فون سے معلوم ہوا کہ اب حالت بڑی تشویش ناک ہے، دو روز بعد وہ جنوری کے اخباروں میں ان کی وفات کی خبر آگئی اور اس طرح قریب اسّی (۸۰) سال پر محیط ایک اہل دل، صاحب اخلاص، دیدہ ور اور دردمند انسان کی داستان مکمل ہوگئی، اِناﷲ وَاِنا اِلیہ رَاجِعونْ۔ پھلواری شریف ان کا مولد ہے، ابتدائی تعلیم کے بعدوہ ندوے آگئے، جہاں مولانا سید ابوالحسن علی ندوی اور شاہ حلیم عطا جیسے اکابر کی سرپرستی اور مولانا سید سلیمان ندوی کی توجہات نے ان کے مستقبل کی راہوں اور منزلوں کو متعین کردیا، فراغت کے بعد ندوے میں قرآن مجید اور لغت قرآن کریم کی تعلیم و تدریس سے ان کے علمی سفر کا آغاز ہوا، بعد میں وہ ندوے کے ادیب اول ہوئے، برطانیہ میں لیڈس یونیورسٹی سے لسانیات میں پی ایچ ڈی کی سند حاصل کی، سعودی عرب میں نشریات کے ادارے سے وابستہ ہوئے، رابطہ...
Human service professionals and those who educate them to promote and encourage the unique values and characteristics of human services. In so doing, human service professionals uphold the integrity and ethics of the profession. The fundamental values of the human services profession include respecting the dignity and welfare of all people; promoting self-determination; honoring cultural diversity; advocating for social justice; and acting with integrity, honesty, genuineness and objectivity. Human service professionals consider these standards in ethical and professional decision making. Ethical-decision making processes should be employed to assure careful choices. The ethical standards are organized in sections around those persons to whom ethical practice should be applied. In this paper will discuss about the Services and Teachings of Molana syed Abdul Ahad Agha.
Cardiovascular diseases (CVDs) are the prime cause of death accounting for 17.7 million deaths every year globally. In Pakistan, prevalence of CVDs is also considerably high. CVDs are multifactorial with many risk factors involved in the pathophysiology of the disease including the genetic predisposition. Genetically, CVDs may be monogenic or polygenic. Also, there is heterogeneity among genetic predisposition of cardiac disorders in different populations of the world. This study aims to investigate the genetic risk factors related to CVDs in Pakistani population. In this study, the whole genome sequencing data of Pakistani individuals (PJL) from 1000 Genomes Project (n=96), whole exome sequencing data from Exome Aggregation Consortium (predominantly containing individuals from Pakistan) (n=8256), and whole exome sequencing data of British Pakistanis (n=3222) were analyzed using different bioinformatics tools against a manually curated list of 1187 genes associated with major CVDs. The analysis of genetic variants with ANNOVAR and CADD tools highlighted 561 deleterious variants from 1000 Genomes PJL, 7374 deleterious variants from ExAC (SAS), and 6028 deleterious variants from British Pakistanis datasets in protein coding regions. The analysis with VEP showed 03 Loss of Function variants from 1000 Genomes PJL, 30 Loss of Function variants from ExAC (SAS), and 29 Loss of Function variants from British Pakistanis datasets. Further, the filtration from ClinVar database revealed 03 pathogenic and 02 likely pathogenic variants from 1000 Genomes Project PJL, 112 pathogenic, and 42 likely pathogenic variants from ExAC (SAS), and 42 pathogenic and 16 likely pathogenic variants from British Pakistanis datasets. The comparative analysis of prioritized deleterious variants showed many variants having two fold or higher allele frequency in Pakistani population than in other populations of the world. Likewise, the population differentiation analysis highlighted 10 deleterious SNVs greatly differentiated from world populations and 02 deleterious SNVs moderately differentiated from other South Asian populations. The principal components analysis showed the grouping of Pakistani and other South Asian populations with Europeans and Americans for deleterious mutations of CVDs. XIV To further analyze the filtered data for CVDs, whole genome sequencing of an individual with hyperlipidemia, obesity, and coronary artery disease was carried out using SOLiD 5500xl NGS system, and whole exome sequencing of 05 patients with dilated cardiomyopathy was carried out using Illumina NGS system. After variants calling and applying the same analysis pipeline, 27 deleterious SNVs were observed in 25 genes associated with hyperlipidemia and risk of coronary artery disease. Two genes, MTRR (methionine synthase reductase), and PLB1 (Phospholipase B1) contained two deleterious variants each, and are associated with low levels of low density lipoprotein-cholesterol (LDL-C) and risk of coronary artery disease. Furthermore, 11 deleterious variants, also filtered from the healthy dataset, were observed having significantly higher allele frequency in SAS Populations than in other populations of the world. In addition, two genes, KCNJ12 (potassium voltage-gated channel subfamily J member 12) and CDC27 (cell division cycle 27 protein), were identified having highest number of deleterious nonsynonymous and non-coding variants. From whole exome analysis of 05 dilated cardiomyopathy patients, 54 variants were identified in genes associated with dilated cardiomyopathy, which were prioritized in mutational load analysis as well. Here, the highest number of deleterious variants was observed in TTN (titin) and MUC19 (Mucin 19) genes. Also, there were 19 deleterious SNVs in homozygous state with global minor allele frequency < 1.0%. Overall, 278 deleterious SNVs were having higher allele frequency in SAS than in other populations of the world. Further, three rare allele frequency (AF < 1%) loss of function SNVs in C2orf40, MYOM3, and TMED4 genes, a homozygous frameshift insertion in RTKN2., and a splice site homozygous deletion in SLC6A6 were found in at least one of the patients. To conclude, this study comprehensively presents a picture of deleterious mutations for cardiac disorders in Pakistani population. The mutational load for major CVDs in a descending order was for hypertension, atherosclerosis, coronary aneurysm, heart failure, coronary artery disease, cardiomyopathies, cardiac arrhythmias, and congenital heart defects. The effect of this genetic predisposition (which is a non- modifiable risk factor) can be suppressed by minimizing the modifiable risk factors such as healthy lifestyle.