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Formation mechanism of self-organized nano-ripples on quartz surface using femtosecond laser pulses
Ahsan, Md. Shamim,Lee, Man Seop,Hasan, Mohammad Khairul,Noh, Young-Chul,Sohn, Ik-Bu,Ahmed, Farid,Jun, Martin B.G. Elsevier 2015 OPTIK -STUTTGART- Vol.126 No.24
<P><B>Abstract</B></P> <P>This article demonstrates the formation of self-organized nano-ripples on a quartz surface by irradiation of femtosecond laser pulses. Self-oriented nano-ripples are printed on the quartz surface by controlling various laser parameters: average pulse energy, pulse width, and number of laser pulses on each irradiated spot. We validate that the direction of the self-organized nano-ripples are oriented perpendicularly to the laser polarization direction. We also investigate and analyze the dependency of nano-ripples period on various laser parameters including the pulse energy, number of laser pulses, and pulse width. The nano-ripples show increasing trend with the increase of laser energy and pulse width, whereas show decreasing trend with the increase of irradiated laser pulses. We also explain, qualitatively, the formation mechanism of the self-organized nano-ripples on quartz surface.</P>
Lipoxygenase Inhibitory Constituents from Indigofera oblongifolia
Ahsan Sharif,Ejaz Ahmed,Abdul Malik,Naheed Riaz,Nighat Afza,Sarfraz Ahmad Nawaz,Muhammad Arshad,Muhammad Raza Shah,Muhammad Iqbal Choudhary 대한약학회 2005 Archives of Pharmacal Research Vol.28 No.7
Indigin, alkylated xanthene (1) and indigoferic acid (2) have been isolated from the chloroform soluble fraction of Indigofera oblongifolia, along with β-sitosterol (3) and 3-hydroxybenzoic acid (4), which are reported for the first time from this species. Their structures were determined through spectroscopic techniques. Both the new compounds 1 and 2 showed significant activity against enzyme lipoxygenase, while 2 further showed moderate inhibition against BChE.
Lipoxygenase Inhibitory Constituents from Indigofera oblongifolia
Sharif, Ahsan,Ahmed, Ejaz,Malik, Abdul,Riaz, Naheed,Afza, Nighat,Nawaz, Sarfraz Ahmad,Arshad, Muhammad,Shah, Muhammad Raza,Chaudhary, Muhammad Iqbal The Pharmaceutical Society of Korea 2005 Archives of Pharmacal Research Vol.28 No.7
Indigin, alkylated xanthene (1) and indigoferic acid (2) have been isolated from the chloroform soluble fraction of Indigofera oblongifolia, along with $\beta$-sitosterol (3) and 3-hydroxybenzoic acid (4), which are reported for the first time from this species. Their structures were determined through spectroscopic techniques. Both the new compounds 1 and 2 showed significant activity against enzyme lipoxygenase, while 2 further showed moderate inhibition against BChE.
Siddiqui, Nadeem,Ahsan, Waquar,Alam, M Shamsher,Ali, Ruhi,Srivastava, Kamna,Ahmed, Sharique Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
Various 2-amino-6-[3-(substituted phenyl)-5-phenyl-4,5-dihydropyrazol-1-yl]-4-(substituted phenyl)nicotinonitriles (3a-t) were designed and synthesized by clubbing two active anticonvulsant pharmacophores pyrazole and pyridine. All the synthesized compounds possessed the pharmacophoric elements essential for good anticonvulsant activity. The anticonvulsant screening was performed by maximal electroshock seizure (MES) and subcutaneous pentylenetetrazole (scPTZ) tests. Two compounds 3i and 3s showed significant anticonvulsant activity in both the screens with $ED_{50}$ values 17.5 mg/kg and 22.6 mg/kg respectively in MES screen and 154.1 mg/kg and 242.6 mg/kg respectively in scPTZ screen. They were also found to have no acute toxic effects in mice when tested at elevated doses.
On Interesting Correlation between Meteorological Parameters and COVID-19 Pandemic in Saudi Arabia
Haq, Mohd Anul,Ahmed, Ahsan International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.4
The recent outbreak of COVID-19 pandemic cases around the globe has affected Saudi Arabia with around 15, 00,000 confirmed cases within the initial 4 months of transmission. The present investigation analyzed the relationship between daily COVID-19 confirmed cases and meteorological parameters in seventeen cities of KSA. We used secondary published data from the Ministry of Health, KSA daily dataset of COVID-19 confirmed case counts. The meteorological parameters used in the present investigation are temperature, humidity, dew point, and wind speed. Pearson correlation and Spearman rank correlation tests were utilized for data analysis. The incubation period of COVID-19 varies from 1 day to 14 days as per available information. Therefore, an attempt has been made to analyze the effects of meteorological factors with bins of 1, 3, 7, and 14 days. The results suggested that the highest number of correlations (15 cities) was observed for temperature (maximum, minimum, and average) and humidity (12 cities) (minimum and average). The dew point showed relationships for 7 cities and wind showed moderate correlations only for 2 cities. The study results might be useful for authorities and stakeholders in taking specific measures to combat the Covid-19 pandemic.
Kidney protective potential of lactoferrin: pharmacological insights and therapeutic advances
Md,Sarwar Zahan,Kazi Ahsan Ahmed,Akhi Moni,Alessandra Sinopoli,Hunjoo Ha,Md Jamal Uddin 대한생리학회-대한약리학회 2022 The Korean Journal of Physiology & Pharmacology Vol.26 No.1
Kidney disease is becoming a global public health issue. Acute kidney injury (AKI) and chronic kidney disease (CKD) have serious adverse health outcomes. However, there is no effective therapy to treat these diseases. Lactoferrin (LF), a multi-functional glycoprotein, is protective against various pathophysiological conditions in various disease models. LF shows protective effects against AKI and CKD. LF reduces markers related to inflammation, oxidative stress, apoptosis, and kidney fibrosis, and induces autophagy and mitochondrial biogenesis in the kidney. Although there are no clinical trials of LF to treat kidney disease, several clinical trials and studies on LF-based drug development are ongoing. In this review, we discussed the possible kidney protective mechanisms of LF, as well as the pharmacological and therapeutic advances. The evidence suggests that LF may become a potent pharmacological agent to treat kidney diseases.
Khalilullah, Habibullah,Khan, Shamshir,Ahsan, Mohamed Jawed,Ahmed, Bahar Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.2
In continuance of our search for newer antihepatotoxic agents some novel thiazolidinone derivatives containing 1,4-benzodioxane ring system were synthesized starting from 2,3-dihydro-1,4-benzodioxane-2-carbohydrazide. The synthesized compounds were evaluated for antihepatotoxic activity against $CCl_4$-induced hepatotoxicity in rats. Among them some compounds have shown significant antihepatotoxic activity comparable to standard drug silymarin.
Nadeem Siddiqui,Waquar Ahsan,M Shamsher Alam,Ruhi Ali, Kamna Srivastava,Sharique Ahmed 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
Various 2-amino-6-[3-(substituted phenyl)-5-phenyl-4,5-dihydropyrazol-1-yl]-4-(substituted phenyl)nicotinonitriles (3a-t) were designed and synthesized by clubbing two active anticonvulsant pharmacophores pyrazole and pyridine.All the synthesized compounds possessed the pharmacophoric elements essential for good anticonvulsant activity. The anticonvulsant screening was performed by maximal electroshock seizure (MES) and subcutaneous pentylenetetrazole (scPTZ) tests. Two compounds 3i and 3s showed significant anticonvulsant activity in both the screens with ED_50 values 17.5 mg/kg and 22.6 mg/kg respectively in MES screen and 154.1 mg/kg and 242.6 mg/kg respectively in scPTZ screen. They were also found to have no acute toxic effects in mice when tested at elevated doses.
Techno-economic design of a grid-tied Photovoltaic system for a residential building
Asad A. Naqvi,Talha Bin Nadeem,Ahsan Ahmed,Muhammad Uzair,S. Asad Ali Zaidi Techno-Press 2022 Advances in energy research Vol.8 No.1
Increasing cost of electricity due to rising price of fuel is one of the local community's main issues. In this research, switching of grid dependent system to the grid-tied Photovoltaic (PV) system with net metering for a residential building is proposed. The system is designed by considering the maximum energy demand of the building. The designed system is analyzed using RETScreen on technical, economic and environmental grounds. It is found that the system is able to produce 12,000 kWh/year. The system is capable to fulfill the electricity demand of the building during day time and is also capable to sell the energy to the local grid causing the electric meter to run in reverse direction. During night time, electricity will be purchased from grid, and electric meter will run in the forward direction. The system is economically justified with a payback period of only 3 years with net present value of PKR. 4,758,132. Also, the system is able to reduce 7.2 tons of CO<sub>2</sub> not produced in the entire life of the project.
Waqar Nasir,Munawar Ali Munawar,Ejaz Ahmed,Ahsan Sharif,Saeed Ahmed,Amjad Ayub,Misbahul Ain Khan,Faizul Hassan Nasim 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.10
In this study, twenty-one arylaminoquinoxalinone derivatives were synthesized and their antibacterial activities against Staphylococci aureus, Pseudomonas aureus, Escherichia coli, Bacillus subtilis, Salmonella typhi, and Shigella pneumoniae were evaluated relative to known antibiotics; augmentin, ampicillin, and chloramphenicol. The insecticidal activities of the prepared compounds were also investigated against Tribolium castaneum using permethrin as a standard insecticide. The derivatives were synthesized using both conventional and microwave techniques. Their structures were confirmed using spectral techniques and elemental analysis.