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| 1 | Two Distinct Fluorescent Quantum Clusters of Gold Starting from Metallic Nanoparticles by pH-Dependent Ligand Etching显示文摘Two fl uorescent quantum clusters of gold,namely Au25 and Au8,have been synthesized from mercaptosuccinic acid-protected gold nanoparticles of 45 nm core diameter by etching with excess glutathione.While etching at pH~3 yielded Au_(25),that at pH 7-8 yielded Au_(8).This is the fi rst report of the synthesis of two quantum clusters starting from a single precursor.This simple method makes it possible to synthesize well-defined clusters in gram quantities.Since these clusters are highly fl uorescent and are highly biocompatible due to their low metallic content,they can be used for diagnostic applications. | Madathumpady Abubaker Habeeb Muhammed Subramani Ramesh Sudarson Sekhar Sinha Samir Kumar Pal Thalappil Pradeep | 2008 | Nano Research2008，1，4： | 5 |
| 2 | In-Situ Hydrothermal Synthesis of Bi–Bi2O2CO3 Heterojunction Photocatalyst with Enhanced Visible Light Photocatalytic Activity显示文摘Bismuth containing nanomaterials recently received increasing attention with respect to environmental applications because of their low cost, high stability and nontoxicity. In this work, Bi–Bi_2O_2CO_3 heterojunctions were fabricated by in-situ decoration of Bi nanoparticles on Bi_2O_2CO_3 nanosheets via a simple hydrothermal synthesis approach. X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and high-resolution TEM(HRTEM) were used to confirm the morphology of the nanosheet-like heterostructure of the Bi–Bi_2O_2CO_3 composite. Detailed ultrafast electronic spectroscopy reveals that the in-situ decoration of Bi nanoparticles on Bi_2O_2CO_3 nanosheets exhibit a dramatically enhanced electron-hole pair separation rate, which results in an extraordinarily high photocatalytic activity for the degradation of a model organic dye, methylene blue(MB) under visible light illumination. Cycling experiments revealed a good photochemical stability of the Bi–Bi_2O_2CO_3 heterojunction under repeated irradiation. Photocurrent measurements further indicated that the heterojunction incredibly enhanced the charge generation and suppressed the charge recombination of photogenerated electron-hole pairs. | Prasenjit Kar Tuhin Kumar Maji Ramesh Nandi Peter Lemmens Samir Kumar Pal | 2017 | Nano-Micro Letters2017，9，2： | 3 |
| 3 | Sitagliptin,sitagliptin and metformin,or sitagliptin and amitriptyline attenuate streptozotocin-nicotinamide induced diabetic neuropathy in rats显示文摘Diabetic neuropathies are a family of nerve disorders caused by diabetes.Symptoms of the disease include nerve palsy,mononeuropathy,mononeuropathy multiplex,diabetic amyotrophy,painful polyneuropathy,autonomic neuropathy,and thoracoabdominal neuropathy.In this study,type 2 diabetes in rats was induced with nicotinamidestreptozotocin.Drug treatment was initiated on the d 15,with the combination regimen of metformin,pioglitazone and glimipiride or metformin and sitagliptin or sitagliptin,amitriptyline and sitagliptin and led to significantly improved glycemic control,increased grip strength and paw jumping response on d 21,28 and 35(P < 0.001).Significant increases in blood protein levels and decreases in urinary protein levels were observed in the animals treated with the different regimens on d 21,28 and 35(P < 0.001).Combined treatment of streptozotocin and nicotinamide caused marked degeneration of nerve cells,while administration of metformin and sitagliptin showed tissue regeneration and no body weight gain.In conclusion,treatment with sitagliptin and sitagliptin combined with metformin or amitriptyline results in no body weight gain,but causes an increase in grip strength and pain sensitivity,exhibits neural protection,and reverses the alteration of biochemical parameters in rats with streptozotocin-nicotinamide induced type 2 diabetes. | Ashish Kumar Sharma Akash Sharma Rita Kumari Kunal Kishore Divya Sharma Bharthu Parthsarthi Srinivasan Ashok Sharma Santosh Kumar Singh Samir Gaur Vijay Singh Jatav Prashant Sharma Varnika Srivastava Sneha Joshi Megha Joshi Prashant Kumar Dhakad Davender Singh Kanawat Akanksha Mishra Anil Sharma Dharmendra Singh Ravinder Pal Singh Himmat Singh Chawda Rambir Singh Sachin Kumar Raikwar Muneem Kumar Kurmi Pankaj Khatri Ashutosh Agarwal Arshee Munajjam | 2012 | The Journal of Biomedical Research2012，26，3： | 2 |
| 4 | Fluorescence relaxation dynamics of acridine orange in nanosized miceUar systems and DNA显示文摘 | Ajay Kumar Shaw Samir Kumar Pal | 2007 | Phys Chem B2007，111，16： | 1 |
| 5 | Anti-inflammatory activity of Acanthus ilicifolius显示文摘 | K.T. Mani Senthil Kumar Bapi Gorain Dilip K. Roy Zothanpuia Samir K. Samanta Mintu Pal Prova Biswas Amrita Roy Dipan Adhikari Sanmoy Karmakar Tuhinadri Sen | 2008 | Journal of Ethnopharmacology2008，，1： | 1 |
| 6 | Development Of Shape Memory Alloy Based Quarter Car Suspension System显示文摘It is well-known that suspension systems plays a major role in automotive technology.Most of the today’s vehicle applies a passive suspension systems consisting of a spring and damper.The design of automotive suspension have been a compromise between passenger comfort,suspension travel and road holding ability.This work aims in reducing the suspension travel alone by developing a quarter car model suspension for a passenger car to improve its performance by introducing shape memory alloy spring(Nitinol)instead of traditional spring.A two way shape memory alloy spring possesses two different stiffness in its two different phases(martensite and austenite).In this study,road profile is considered as a simple harmonic profile and vibration analysis of aminiature quarter car model suspension system has been carried out experimentally.Using theoretical method,the displacement of the sprung mass is also studied and discussed.The vibration analysis have been carried out for the suspension system at both phases of the spring and the results gives a significant improvement in reducing the displacement of sprung mass for various excitation frequencies. | P.Sathish Kumar R.Rajasekar C.Sivasenapathy Samir Kumar Pal | 2020 | Journal of Mechanical Engineering Research2020，3，1： | 0 |
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