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Review : Mechanisms of Type-I Interferon Signal Transduction
( Shahab Uddin ),( Leonidas C. Platanias ) 생화학분자생물학회 2004 BMB Reports Vol.37 No.6
Interferons regulate a number of biological functions including control of cell proliferation, generation of antiviral activities and immumodulation in human cells. Studies by several investigators have identified a number of cellular signaling cascades that are activated during engagement of interferon receptors. The activation of multiple signaling cascades by the interferon receptors appears to be critical for the generation of interferon-mediated biological functions and immune surveillance. The present review summarizes the existing knowledge on the multiple signaling cascades activated by Type I interferons. Recent developments in this research area are emphasized and the implications of these new discoveries on our understanding of interferon actions are discussed.
Chronic Infection and Nodule Formation following Deoxycholate Injection
Shahab Shahid,Fawaz Al-Hassani 대한성형외과학회 2022 Archives of Plastic Surgery Vol.49 No.3
Aqualyx (Marllor International Ltd, Rimini, Italy) was originally developed in Italy by Professor Pasquale Motolese and has been commercially available since 2009. It is a deoxycholate, aqueous gelatinous solution mixed with saline and buffering compounds. It is the only drug approved by the European Union for the reduction in localized fat. Aqualyx is sold exclusively to doctors and nurses trained in intralipotherapy. In the case of our patient, the product administered was advertised as Aqualyx, but was not administered by a trained health professional and was administered too superficially. The patient developed severe pain following the injection and was unable to sit for several weeks. There was localized skin necrosis, and palpable collections where the injection was administered. Our initial suspicion was development of an abscess or hematoma. To characterize further, we arranged an ultrasound scan that showed a “superficial hypoechoic lesion” but no deeper infection or spread. The numerous painful nodules ruptured onto the skin surface, resulting in purulent and bleeding lesions. This case demonstrates the importance of appropriate training and competence in performing cosmetic procedures including injections and fat dissolving treatments.
Outcome of Inversion 16 in TKD Positive and Negative Acute Myeloid Leukemia Patients
Shahab, Sadaf,Zahid, Danish,Ahmed, Shariq,Nadeem, Muhammad,Farzana, Tasneem,Taj, Mehwesh,Ahmed, Nuzhat,Shamsi, Tahir S Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.4
Shahab, Muhammad Basit,Usman, Muhammad Arslan,Shin, Soo Young IEEE 2017 IEEE communications letters Vol.21 No.2
<P>This letter proposes a novel algorithm named bandwidth adaptation by squeezing idle traffic (BASIT), which aims at reducing the video traffic in idle tabs/windows of browsers. The algorithm is based on detecting active tabs/windows in the browsers at client end. Video data on idle tabs are intelligently compressed by the server to save network bandwidth. Bandwidth wasted on idle video traffic is reduced by either sending the lowest quality of the video or only audio throughout the idle duration of the tabs/windows. It is understandable that substantial amount of bandwidth can be saved by applying BASIT algorithm on browsers.</P>
Board Structure and Likelihood of Financial Distress: An Emerging Asian Market Perspective
Shahab UD-DIN,Muhammad Yar KHAN,Anam JAVEED,Ha PHAM 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.11
This study examines the relationship between the attributes of board structure and the likelihood of financial distress for the non-financial sector of an emerging market characterized by concentrated ownership and family-controlled business. The present study utilized panel logistic regression to estimate the relationship between board structure attributes and the likelihood of financial distress. We used Altman Z-Score as a proxy for firm financial distress, as this tool measures the financial distress inversely. The study finds a significant relationship between board size and the likelihood of financial distress. The results show that a one-unit increase in board size would decrease the probability of financial distress by 3.4%. Further, we observe that a greater level of board independence is associated with a lower likelihood of financial distress. A one-unit increase in board independence would decrease the probability of financial distress by 20.4%. We also find a significant positive impact of leverage on the likelihood of financial distress. The present study contributes to the body of literature on board structure attributes and likelihood of financial distress in emerging markets, like Pakistan. Furthermore, the findings would be beneficial for corporate policymakers and investors in formulating corporate financial strategy and predicting business failure.
Shahab Saedi,Sayed S. Madaeni,Keyumars Hassanzadeh,Ahmad Arabi Shamsabadi,Saeed Laki 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
In the present study, asymmetric gas separation membranes of polyethersulfone (PES) and polyethersulfone/polyurethane (PU) were prepared with different blend compositions. The prepared membranes were investigated for the separation of carbon dioxide from methane. The effect of PU on the microstructure and d-spacing of the membranes was studied by X-ray diffraction analysis and the miscibility of PES and PU was investigated using Differential Scanning Calorimetry (DSC). The thermal properties of PES and PES/PU were compared using Thermal Gravimetric Analysis (TGA). The effect of PES/PU blend composition on the morphology and porosity of the membrane was investigated by Scanning Electron Microscopy (SEM) and porosity experiments. Density Functional Theory (DFT) calculations were used to investigate the relative affinity of CO2, CH4 and H2O for PES and PU. Moreover, the effect of PU on the casting solution viscosity, gas sorption and mechanical properties of the PES membrane was investigated. For comparing gas separation performance of PES and PES/PU membranes, pure and mixed gas experiments were carried out. The obtained results indicated that the presence of PU in the casting solution increases the d-spacing and fractional free volume, and decreases the membrane porosity; Tg and thermal resistance, membrane gas sorption as well as CO2 induced plasticization by decreasing Langmuir capacity, and also increases strength at yield and elongation at yield of PES membrane. The presence of PU decreases the CO2 permeance and enhances the CO2/CH4 selectivity and plasticization pressure of the PES membrane. Furthermore, the presence of the PU changes the membrane behavior against the feed pressure, feed temperature and feed composition in the mixed gas experiments.
Nanostructured polysaccharide-based carriers for antimicrobial peptide delivery
Shahab Mohtashamian,Soheil Boddohi 한국약제학회 2017 Journal of Pharmaceutical Investigation Vol.47 No.2
In recent decade, antimicrobial resistance is a serious international concern resulted by misuse of antibiotics. Some dangerous pathogenic strains such as Methicillin- resistant Staphylococcus aureus are resistant to the wide range of conventional antibiotics. Antimicrobial peptides (AmPs) are remarkable antibacterial drugs, which can be used instead of conventional antibiotics due to their membrane targeting activity especially against both gramnegative and gram-positive multidrug-resistant strains of pathogenic bacteria. Target delivery of AmPs is necessary because of short half-life and relative toxicity against healthy cells. Polysaccharide-based nanostructured carriers such as nanoparticles and layer-by-layer thin films are widely used due to their biocompatibility, stimuli-responsive properties, and strong affinity to bond with proteins and peptides. In this review, we focus on some prominent polysaccharide-based AmP delivery systems and describe some advantage and disadvantage of each carrier. We also introduce some novel AmP nanocarriers due to the two main strategies of combat against antibacterial resistance. Among these novel carriers, polysaccharide-based nanogels have incredible properties such as high loading capacity, stimuli responsive release behavior, simple largescale production, and thermodynamically stability, which could be a promising candidate for controlled release of AmPs.
Overall Survival in Acute Myeloid Leukaemia Patients with and without Internal Tandem Duplication
Shahab, Sadaf,Qadar, Zeeshanul,Nadeem, Muhammad,Zahid, Danish,Ansari, Saqib,Farzana, Tasneem,Taj, Mehwesh,Borhany, Munira,Ahmed, Nuzhat,Shamsi, Tahir S. Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.1
Shahab, Sadaf,Shamsi, Tahir S.,Ahmed, Nuzhat Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.9
AML (Acute myeloid leukemia) is a form of blood cancer where growth of myeloid cells occurs in the bone marrow. The prognosis is poor in general for many reasons. One is the presence of leukaemia-specific recognition markers such as FLT3 (fms-like tyrosine kinase 3). Another name of FLT3 is stem cell tyrosine kinase-1 (STK1), which is known to take part in proliferation, differentiation and apoptosis of hematopoietic cells, usually being present on haemopoietic progenitor cells in the bone marrow. FLT3 act as an independent prognostic factor for AML. Although a vast literature is available about the association of FLT3 with AML there still is a need of a brief up to date overview which draw a clear picture about this association and their effect on overall survival.