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The Chemistry of Urea, Thiourea and Their Applications in Material & Bio-Sciences

Thesis Info

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Author

Maliha, Bushra

Program

PhD

Institute

University of the Punjab

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2010

Thesis Completion Status

Completed

Subject

Chemistry

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/1896

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727569460

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The research work reported in the thesis comprises two parts. In the first part the reaction of ortho-phthaldehyde with urea, thiourea and their N-alkyl/aryl derivatives is conducted in acidic and basic media. The resulting chromogens and non-chromogens compounds are separated by physical, chemical and various kinds of chromatographic techniques and structure are elucidated by all means of spectroscopy and a single X-ray crystallography. After identification of compounds, the methods for the determination of urea present in biological samples are worked out; this will help in modification of existing clinical techniques used for exact diagnosis of various diseases. Biological properties of the compounds (isoindolines, benzodiazepines and isobenzofuran) obtained from the above said reactions are evaluated. In the second part of the thesis functionalised diarylcarbenes are synthesized which are excellent reactive intermediates suitable for the direct surface modification of organic polymers which are in fact used to introduce urea and thiourea functions onto polystyrene at loading levels of up to 2.3 x 1013 molecules/cm2. Surface modification is confirmed by different spectral and non-spectral techniques (ATR-IR, XPS & elemental analysis). The moidifed polymers are capable of reversible binding and release of peroxide at loading levels of up to 0.6 mmol/g, and polymers display biocidal activity against a spectrum of Gram-positive and Gram-negative bacteria.
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جہالت ترقی کی دشمن ہے

جہالت ترقی کی دشمن ہے
نحمدہ ونصلی علی رسولہ الکریم امّا بعد فاعوذ بااللہ من الشیطن الرجیم
بسم اللہ الرحمن الرحیم
معززصدر ومیرے ہم مکتب ساتھیو! آج مجھے جس موضوع پر گفتگو کا موقع فراہم کیا گیا ہے وہ ہے:’’جہالت ترقی کی دشمن ہے ‘‘
صدرِذی وقار!
اس کائنات رنگ و بو میں جو رنگینیاں نظر آرہی ہیں، جو رعنائیاں نمونہ دھنک پیش کر رہی ہیں، گلستانِ ہستی میں جو بہار آئی ہوئی ہے، چمنستانِ حیات نے جو اپنا بھرم قائم رکھا ہوا ہے۔ عنادلِ خوش الحان کی جو مترنم صدائیں گونج رہی ہیں، یہ سب کی سب شعور و آگہی کی مرہونِ منت ہیں۔
جنابِ صدر!
علم ایک ایسا نور ہے جو جہالت کی تار یک عباؤں کو تار تار کر دیتا ہے، آفتاب علم و دانش کی نور فشاں کرنیں جب ظلمت کدہ ٔجہالت پر پڑتی ہیں تو وہ بقعۂ نور بن جاتا ہے، عروج و ترقی کے راستے میں موجود رکاوٹیں ختم ہوجاتی ہیں، زندگی حسن و جمال کا مرقعّ بن جاتی ہے۔
محترم صدر!
تاریخ کے اوراق شاہد ہیں کہ جس نے بھی اپنے آپ کوعلم کے زیور سے مرصعّ کیا، اپنے سر پر معرفت وآ گہی کا تاج سجایا، اپنی کشتِ شعور و عقل کی علم و دانش کے ذریعے آبیاری کی ، اپنے قلب و اذہان کو بذریعہ علم و آ گہی طراوت بخشی ، علم و دانش کی خلعتِ فاخرہ زیب تن کی اللہ تعالیٰ نے انہیں عروج و ترقی کی مسند کا صدرنشین بنادیا۔
صدرمحترم!
جہالت واقعی ترقی کی دشمن ہے، ترقی کے مناظر دلکش دیکھنے کے لیے ،عروج کے لازوال نظاروں کی منظر کشی کرنے کے لیے، جہالت کی عینک کو اتارنا ہوگا، لا پرواہی اور غفلت کے حصار سے باہر آنا ہو گا ، تساہل پسندی کی خصلت قبیحہ کو نیست و نابود...

منو دھرم شاستر اور ہندو نظام میراث

It is said that “Mony makes the mare go ” and it is so because AH’ah Subhdn-au-Taa’la Has willed it so. Wealth is thus, a great blessing and a means of great trial for man at the same time. It is utility and worth-no matter how a man may amass wealth- is restricted to this world alone. A man enters into the world hereafter-empty handedly. All his treasured troves of gold and silver are bequeathed to his loved ones after his demise. Had there been no proper mechanism or a modus-oerandi for the division of this left-over money/inheritance then violence and bloody feuds would have sparked amongst the heirs. Hence we find that almost all religions offer guidelines for the division of ( bequeathed mony or) wealth and valuables left after the death of a person. So is the case of Hindu religion. The purpose of this article is to focus, assess and analyze the Hindu system of inheritance-as to how to disperse the left-over wealth amongst the closest relatives of the decease

Papers on Relationship Between Inflation and Relative Price Variability: Case of Pakistan

This dissertation explores different dimensions of the relationship between inflation and relative price variability in Pakistan. The period covered for this study is from July 2001 to June 2011, as this is the complete period for which data on new base (2000-01) is available. Incidentally, this period has both the low and high inflation episodes. This is the only study in case of Pakistan, which uses detailed data on prices at city level and commodity group level. The dissertation has analyzed relationship between inflation and relative price variability in three aspects. First, we have examined the behavior of price setting agents as reflected in relative price changes in response to demand and supply factors; second, we studied the effect of relative price variability on inflation by estimating fixed effects regression model using panel data of inflation in different cities of Pakistan; and third, we have examined convergence of prices changes in 35 cities of Pakistan, and also looked at how location of cities affects the convergence. The result of our first study suggests that changes in real income have insignificant impact on relative price variability. The results make sense as changes in income (with given preferences) almost evenly affect demand for all consumer items, which may lead to relatively proportional changes in their prices. It can be a case particularly in a developing economy like Pakistan, having a large informal sector, where response of firms is less constrained by wage contracts; and where capacity issues are less heterogeneous. On the other hand, unanticipated inflation, which usually comes from item-specific supply factors, may affect prices of different items unevenly. From the second study, the results show that inflation, both food and non-food inflation, is significantly and positively affected by relative price variability. The results imply that supply side factors, as exhibited in dispersion of relative price changes, are robust determinant of inflation in a developing economy, like developed economies. From our third study, we found that there is bilateral price-level convergence for only food group with speed of convergence (measured by half-life) is around 3 months. On the other hand, prices of non-food commodities have very low speed of adjustment with 20 month half-life. Consequently, relative prices of overall commodities group have half-life of 8 month – a moderate speed of convergence. We have also identified differences in the behavior of relative prices within and across provinces of Pakistan. The relative prices between two cities located in the same province show lower variability compared with cites pair located in different provinces. However, if at least one of city associated with a relative price series is located in one province, standard deviation of relative prices rises in case of overall and food group. While exploring the impact of distance between cities of a pair, we have found that the standard deviation of relative prices increase significantly with the distance. This result accords well with the findings of some previous studies e.g. Engle and Rogers (1996). The policy implications from my study is; as the supply side factors are found to be dominant in affecting economic activity and inflation rate in Pakistan, therefore, monetary authority needs to be careful while taking decisions on monetary policy instrument. For instance, in 2008 when inflation rate was approximately 20 percent, SBP increased discount rate to give a signal of tight monetary policy stance. This badly affected economic activity at that time and GDP growth rate turned out to be zero. Therefore, cost push inflation should be dealt with much care while taking monetary policy decisions. Another implication of this research is that monetary policy may target a narrow measure of general price level. For instance, core inflation can be targeted. Moreover, an index of general price level can be constructed that is in control of monetary policy with minimum control error.