Amit Singh

Bio: Amit Singh is an academic researcher from National Institute of Technology, Patna. The author has contributed to research in topics: Digital watermarking & Watermark. The author has an hindex of 57, co-authored 640 publications receiving 13795 citations. Previous affiliations of Amit Singh include Ithaca College & Center for Infectious Disease Research and Policy.

Immobilization of Intact Phage and Phage-Derived Proteins for Detection and Biocontrol Purposes.

Abstract: The natural specificity of bacteriophages toward their hosts represents great potential for the development of platforms for the capture and detection of bacterial pathogens. Whole phage can carry reporter genes to alter the phenotype of the target pathogen. Phage can also act as staining agents or the progeny of the infection process can be detected. Alternatively, using phage components as probes offer advantages over whole phage particles, including smaller probe size and resilience to desiccation. Phage structures can be engineered for improved affinity, specificity, and binding properties. However, such concepts require the ability to anchor phage and phage-components onto mechanical supports such as beads or flat surfaces. The ability to orient the anchoring is desired in order to optimize binding efficiency. This chapter presents various methods that have been employed for the attachment of phage and phage components onto support structures such as beads, filters, and sensor surfaces.

Bile Duct Injuries: Outcome of Early and Delayed Repair at a Tertiary Care Centre

Abstract: Bile duct injuries (BDIs) are fearsome complication following open or laparoscopic cholecystectomy (LC). Significant morbidity can accompany such injuries. Late complications such as anastomotic bile duct strictures or secondary biliary cirrhosis may result in lifelong disability. The aim of the study was to assess the outcome of early (up to 7 days) and delayed (after 6 weeks) definitive repair of BDIs. It was a prospective study from June 2015 to May 2017 done at a tertiary care centre. The patients who underwent surgical management of bile duct injuries were part of the study and were followed up until end of the study period and assessed for stricture as primary objective and other secondary objectives, e.g. post-op complications and grade of repair of bile duct injury. Stricture was defined as stricture causing sign and symptoms requiring surgical, percutaneous or endoscopic intervention. A total of 50 patients were part of the study, out of which 15 underwent early and 35 underwent delayed repair. Mean follow-up of patients was 10.8 months (1–24 months). Bile duct injuries were classified as per Strasberg classification. It included 7 patients with E1, 15 patients of E2, 20 patients of E3, 5 E4 and 3 patients with type D injuries. The surgical reconstruction done was hepaticojejunostomy (HJ) in 48 and primary repair in 2 patients. The post-op complication observed were post-op bile leak in 4 patients (3 in early and 1 in delayed group, p = 0.041) and cholangitis in 3 patients (1 in early group and 2 in delayed group, p = 0.897). On comparison of stricture rate with post-op bile leak and cholangitis, both variables had significantly high stricture rate (p = 0.014 and p = 0.002, respectively). The grades of repair as per Mc Donald’s grading was grade A in 30, B in 16, C in 1 and D in 3 patients. The stricture was seen in 2 patients of early group and 1 patient in delayed group (p = 0.153). Our result suggests that early repair has more post-op complication with comparable stricture rates in patients with no evidence of systemic sepsis and intra-abdominal collection. Such repairs should be done at specialized centres with surgeons having experience in managing these cases.

Content Validity of an Integrated Yoga Module for Practice During Remission in Relapsing-Remitting Multiple Sclerosis Patients.

Abstract: Background:Some investigations point to the beneficial effects of yoga in alleviating the motor and cognitive dysfunctions in multiple sclerosis (MS) patients by using varying combinations of physi...

Polymorphic forms of sofosbuvir

Abstract: The present disclosure provides crystalline sofosbuvir form-M1 and amorphous solid dispersion of sofosbuvir. The present disclosure also provides a process for the preparation of the amorphous form of sofosbuvir, the crystalline form of sofosbuvir, and amorphous solid dispersion of sofosbuvir and one or more pharmaceutically acceptable carriers.

Robust lysosomal rewiring in Mtb infected macrophages mediated by Mtb lipids restricts the intracellular bacterial survival

Abstract: Intracellular pathogens commonly manipulate the host lysosomal system for their survival, however whether this affects the organization and functioning of the endo-lysosomal system itself is not known. Here, we show using in vitro and in vivo infections that the lysosomal content and activity is globally elevated in M. tuberculosis infected macrophages. The enhanced lysosomal state is sustained over time and defines an adaptive homeostasis of the infected cell. Lysosomal alterations are caused by mycobacterial surface components, notably the cell wall lipid SL-1, which functions through the mTORC1-TFEB axis. Mtb mutant defective for SL-1 levels shows reduced lysosomal content and activity compared to wild type. Importantly, this phenotype is conserved during in vivo infection, as well as in clinical Mtb isolates that are deficient in SL-1. The alteration in lysosomal phenotype in mutant Mtb lead to decreased lysosomal delivery of Mtb, and importantly, increased survival of intracellular Mtb. These results define the global alterations in the host lysosomal system as a crucial distinguishing feature of Mtb infected macrophages that is host protective and contribute to the containment of the pathogen.

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

Pattern Recognition and Machine Learning

Abstract: Probability Distributions.- Linear Models for Regression.- Linear Models for Classification.- Neural Networks.- Kernel Methods.- Sparse Kernel Machines.- Graphical Models.- Mixture Models and EM.- Approximate Inference.- Sampling Methods.- Continuous Latent Variables.- Sequential Data.- Combining Models.

Harrison's Principles of Internal Medicine

Abstract: The 11th edition of Harrison's Principles of Internal Medicine welcomes Anthony Fauci to its editorial staff, in addition to more than 85 new contributors. While the organization of the book is similar to previous editions, major emphasis has been placed on disorders that affect multiple organ systems. Important advances in genetics, immunology, and oncology are emphasized. Many chapters of the book have been rewritten and describe major advances in internal medicine. Subjects that received only a paragraph or two of attention in previous editions are now covered in entire chapters. Among the chapters that have been extensively revised are the chapters on infections in the compromised host, on skin rashes in infections, on many of the viral infections, including cytomegalovirus and Epstein-Barr virus, on sexually transmitted diseases, on diabetes mellitus, on disorders of bone and mineral metabolism, and on lymphadenopathy and splenomegaly. The major revisions in these chapters and many

Shape‐Controlled Synthesis of Metal Nanocrystals: Simple Chemistry Meets Complex Physics?

Abstract: Nanocrystals are fundamental to modern science and technology. Mastery over the shape of a nanocrystal enables control of its properties and enhancement of its usefulness for a given application. Our aim is to present a comprehensive review of current research activities that center on the shape-controlled synthesis of metal nanocrystals. We begin with a brief introduction to nucleation and growth within the context of metal nanocrystal synthesis, followed by a discussion of the possible shapes that a metal nanocrystal might take under different conditions. We then focus on a variety of experimental parameters that have been explored to manipulate the nucleation and growth of metal nanocrystals in solution-phase syntheses in an effort to generate specific shapes. We then elaborate on these approaches by selecting examples in which there is already reasonable understanding for the observed shape control or at least the protocols have proven to be reproducible and controllable. Finally, we highlight a number of applications that have been enabled and/or enhanced by the shape-controlled synthesis of metal nanocrystals. We conclude this article with personal perspectives on the directions toward which future research in this field might take.