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Shanghai, China

Sina is a Chinese online media company for Chinese communities around the world. Sina operates four major business lines: Sina Weibo, Sina Mobile, Sina Online, and Sina.net. Sina has over 100 million registered users worldwide. Sina was recognized by Southern Weekend as the "China's Media of the Year" in 2003.Sina owns Sina Weibo, a Twitter-like microblog social network, which has 56.5 percent of the Chinese microblogging market based on active users and 86.6 percent based on browsing time over Chinese competitors such as Tencent and Baidu. The social networking service has more than 500 million users and millions of posts per day, and is adding 20 million new users per month, says the company. The top 100 users now have over 180 million followers combined.Sina.com is the largest Chinese-language web portal. It is run by Sina Corporation, which was founded in 1999. The company was founded in China, and its global financial headquarters have been based in Shanghai since October 1, 2001.Sina App Engine is the earliest and largest PaaS platform for cloud computing in China. It is run by SAE Department, which was founded in 2009. SAE is dedicated in providing stable, effective web deployment and hosting service for those corporations, organizations and independent developers. Now more than 300 thousands developers in China are using SAE. Wikipedia.


In this study, a novel fibrous nano-silica (KCC-1) supported ionic liquid (KCC-1/IL) with high surface area and easy accessibility of active sites was successfully developed by a facile approach. The synthesized KCC-1/IL nanocatalyst exhibited excellent catalytic activity for the synthesis of quinazoline-2,4(1 H,3 H)-diones from CO2 and 2-aminobenzonitriles under mild conditions to the easy accessibility of the active sites. A high catalytic activity and ease of recovery from the reaction mixture by using filtration and several reuses without any significant loss in performance are additional eco-friendly attributes of this catalytic system. © 2015 Elsevier B.V. All rights reserved. Source


El-Kholey K.E.,Sina
International Journal of Oral and Maxillofacial Surgery | Year: 2014

For more than a decade, peri-implant tissues have been treated with soft tissue lasers to create a bloodless flap for implant placement and to uncover implants with minimal bleeding, trauma, and anaesthesia. This study was designed to assess if dental implant uncovering is possible with a diode laser without anaesthesia, and to compare its performance with traditional cold scalpel surgery. Thirty patients with a total of 45 completely osseointegrated implants participated in this study. Patients were divided into two groups. For the study group, second-stage implant surgery was done with a 970 nm diode laser. For the control group, the implants were exposed with a surgical blade. Certain parameters were used for evaluation of the two techniques. The use of the diode laser obviated the need for local anaesthesia; there was a significant difference between the two groups regarding the need for anaesthesia (P < 0.0001). However, there were no significant differences between the two techniques regarding duration of surgery, postoperative pain, time for healing, and success of the implants. The diode laser can be used effectively for second-stage implant surgery, providing both the dentist and the patient with additional advantages over the conventional methods used for implant exposure. © 2013 Published by Elsevier Ltd on behalf of International Association of Oral and Maxillofacial Surgeons. All rights reserved. Source


El-Kholey K.E.,Sina
International Journal of Oral and Maxillofacial Surgery | Year: 2014

The purpose of this study was to compare the efficacy of two antibiotic regimens in reducing early dental implant failure. A preoperative single-dose regimen and a 3-day antibiotic course were compared. Eighty subjects needing dental implant placement were randomly allocated to one of the two antibiotic prophylaxis regimen groups. In the first group, dental implants were placed after the administration of a single preoperative dose of antibiotic (1 g of amoxicillin); no postoperative antibiotics were given. In the second group, dental implants were inserted in patients who received the same preoperative dose of antibiotic as the first group, but the antibiotic was then continued postoperatively for 3 days. Patients returned for postoperative evaluation at 3 days, 7 days, and 12 weeks. The surgical sites were assessed for pain, swelling, wound dehiscence, and pus formation. No statistically significant difference was observed between the two groups, probably because of the limited number of patients. Although minor complications were seen in a few patients, all implants were successfully osseointegrated. Until a study with a larger population rules definitively on the role of antibiotics in implant surgery, a single dose of antibiotic before implant placement may be sufficient. © 2013 International Association of Oral and Maxillofacial Surgeons. Source


Ahmed S.F.,Sina
The journal of headache and pain | Year: 2013

Sinusitis is the most frequent misdiagnosis given to patients with migraine.Therefore we decided to estimate the frequency of misdiagnosis of sinusitis among migraine patients. The study included migraine patients with a past history of sinusitis. All included cases fulfilled the International Classification of Headache Disorders, 3rd edition (ICHD-III- beta) criteria. We excluded patients with evidence of sinusitis within the past 6 months of evaluation. Demographic data, headache history, medical consultation, and medication intake for headache and effectiveness of therapy before and after diagnosis were collected. A total of 130 migraine patients were recruited. Of these patients 106 (81.5%) were misdiagnosed as sinusitis. The mean time delay of migraine diagnosis was (7.75 ± 6.29, range 1 to 38 years). Chronic migraine was significantly higher (p < 0.02) in misdiagnosed patients than in patients with proper diagnosis. Medication overuse headache (MOH) was reported only in patients misdiagnosed as sinusitis. The misdiagnosed patients were treated either medically 87.7%, or surgically12.3% without relieve of their symptoms in 84.9% and 76.9% respectively. However, migraine headache improved in 68.9% after proper diagnosis and treatment. Many migraine patients were misdiagnosed as sinusitis. Strict adherence to the diagnostic criteria will prevent the delay in migraine diagnosis and help to prevent chronification of the headache and possible MOH. Source


A topical liposomal composition of Amphotricin B (AmB) and method for preparing same, which can be used as a composition and method for preparing topical liposomal compositions of other hydrophobic drugs. The formulation using AmphotricinB can be used for treating fungal or protozoan infections. The composition is stable with no significant changes in the sizes and AmB content of liposomes after storing at 4 C. and room temperature (22 C.) for more than 20 months. In in vivo and in vitro testing, the compositions exhibit high efficacy in treating cutaneous leishmaniasis.

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