Design and development of efficient and compact 20 kW 325 MHz solid-state amplifier for superconducting accelerator applications.

An efficient and compact, 20 kW solid-state power amplifier (SSA) at 325 MHz has been designed and developed in-house, using single stage combining. It comprises of 24 nos. of 1 kW power amplifier (PA) modules, a 24-way Wilkinson power combiner and divider, and other peripheral systems.

Low awareness but high acceptability of pre-exposure prophylaxis for HIV among men who have sex with men and transgender persons in Delhi, India.

HIV pre-exposure prophylaxis (PrEP) is part of India's HIV prevention policy. We aimed to determine awareness of and willingness-to-use PrEP among men-who-have-sex-with-men (MSM) and transgender-persons (TG) in Delhi, India. A cross-sectional study was conducted at five purposively selected targeted-intervention projects in Delhi.

Transfer learning approach toward joint monitoring of bit rate and modulation format.

Convolutional neural network based transfer learning (TL) is proposed to achieve joint optical performance monitoring with bit rate and modulation format identification in optical communication systems. TL is used to improve the execution of various tasks by extracting features without knowing other optical link parameters. Eye diagrams of four different modulation formats are generated at optical signal-to-noise ratios (OSNRs) varying from 15 to 30 dB for two distinct bit rates, which are then identified simultaneously with a trained deep neural network.

Augmenting performance of a MEMS cantilever-based photonic crystal waveguide for switching applications.

In this paper, a micro-electro-mechanical system-based cantilever is integrated as a line defect on a photonic crystal silicon slab for optical switching applications. The elliptical holes are etched in the photonic crystal waveguide that result in wide transmission bandwidth of 56 nm in comparison to etched circular holes in the structure with a footprint of only ${12.5}\,\,{\unicode{x00B5}{\rm m}} \times {8}\,\,{\unicode{x00B5}{\rm m}}$12.

Positron Emission Tomography Detects Expression of Disialoganglioside GD2 in Mouse Models of Primary and Metastatic Osteosarcoma.

The cell membrane glycolipid GD2 is expressed by multiple solid tumors, including 88% of osteosarcomas and 98% of neuroblastomas. However, osteosarcomas are highly heterogeneous, with many tumors exhibiting GD2 expression on <50% of the individual cells, while some tumors are essentially GD2-negative. Anti-GD2 immunotherapy is the current standard of care for high-risk neuroblastoma, but its application to recurrent osteosarcomas, for which no effective therapies exist, has been extremely limited.

Exploiting the co-reliance of tumours upon transport of amino acids and lactate: Gln and Tyr conjugates of MCT1 inhibitors.

Glutamine and tyrosine-based amino acid conjugates of monocarboxylate transporter types 1 and 2 inhibitors (MCT1/2) were designed, synthesized and evaluated for their potency in blocking the proliferation of a human B lymphoma cell line that expresses the transporters Asct2, LAT1 and MCT1. Appropriate placement of an amino acid transporter recognition element was shown to augment anti-tumour efficacy vs. Raji cells.

Error probability performance of a short-reach multicore fiber optical interconnect transmission system.

A standalone module for rectangular array multicore fiber (MCF)-based optical interconnect (OI) is realized that includes inherent intercore crosstalk and provides space division multiplexed coupling/decoupling of optical power. The module is integrated in a short-reach communication system to provide bit error probability (BEP). Next, a closed-form equation for BEP applicable to MCF OI with intercore crosstalk is derived.

GSK3 inhibitors stabilize Wee1 and reduce cerebellar granule cell progenitor proliferation.

Ubiquitin mediated proteolysis is required for transition from one cell cycle phase to another. For instance, the mitosis inhibitor Wee1 is targeted for degradation during S phase and G2 to allow mitotic entry. Wee1 is an essential tyrosine kinase required for the G2/M transition and S-phase progression.

Blocking lactate export by inhibiting the Myc target MCT1 Disables glycolysis and glutathione synthesis.

Myc oncoproteins induce genes driving aerobic glycolysis, including lactate dehydrogenase-A that generates lactate. Here, we report that Myc controls transcription of the lactate transporter SLC16A1/MCT1 and that elevated MCT1 levels are manifest in premalignant and neoplastic Eμ-Myc transgenic B cells and in human malignancies with MYC or MYCN involvement. Notably, disrupting MCT1 function leads to an accumulation of intracellular lactate that rapidly disables tumor cell growth and glycolysis, provoking marked alterations in glycolytic intermediates, reductions in glucose transport, and in levels of ATP, NADPH, and ultimately, glutathione (GSH).

An ultra-high throughput cell-based screen for wee1 degradation inhibitors.

The tyrosine kinase Wee1 is part of a key cellular sensing mechanism that signals completion of DNA replication, ensuring proper timing of entry into mitosis. Wee1 acts as an inhibitor of mitotic entry by phosphorylating cyclin-dependent kinase CDK1. Wee1 activity is mainly regulated at the protein level through its phosphorylation and subsequent degradation by the ubiquitin proteasome pathway.

Studies toward a library of tetrahydrofurans: click and MCR products of mono- and bis-tetrahydrofurans.

Mono- and bis-tetrahydrofuran-based chemical libraries with diverse structural features have been prepared using the Sharpless azide-alkyne Click reaction and multi-component reactions (MCRs) such as Ugi and Biginelli reactions. Mono- and bis-tetrahydrofuran methyl azides, amines and ureas were key intermediates in these processes, and they were synthesized from the corresponding tetrahydrofuran methyl alcohols by mesylation followed by substitution with azide, reduction of the azide to the amine, and urea formation, as needed. Most mono- and tetrahydrofuran methyl alcohols were obtained by a Sharpless asymmetric dihydroxylation reaction.

Amino acid based enantiomerically pure 3-substituted benzofused heterocycles: A new class of antithrombotic agents.

A diverse group of novel medium ring heterocycles derived from naturally abundant proteinogenic amino acids were evaluated for their potency towards antithrombotic activity. The more potent benzofused oxazepine and oxazocine scaffolds were diversified by incorporating different amino acids at the position number 3. Further the effect of ring size has also been taken into account and it was observed that the eight-membered oxazocines ane more potent compared to the corresponding oxazepines.

Anti-tumor activity of a new series of benzoxazepine derivatives in breast cancer.

A series of new benzoxazepine derivatives substituted with different alkoxy and aryloxy group were synthesized comprising synthetic steps of Mitsunobu reaction, lithium aluminum hydride (LAH) reduction, followed by debenzylation and finally intramolecular Mitsunobu cyclization. The new benzoxazepines specifically inhibited growth of breast cancer cell lines, MCF-7 and MDA-MB-231, but lack cytotoxicity to normal HEK-293 cells. The cell growth inhibition induced by the active compounds was due to cell cycle arrest at G(0)/G(1) phase.

Diversity-oriented synthetic approach to naturally abundant S-amino acid based benzannulated enantiomerically pure medium ring heterocyclic scaffolds employing inter- and intramolecular mitsunobu reactions.

The diversity-oriented organic synthesis of enantiomerically pure benzannulated oxazepine, diazepine, thiazepine, oxazocine, and diazocine scaffolds is described from easily accessible naturally occurring S-amino acids as chiral synthons. Inter- and intramolecular Mitsunobu reactions for the formation of carbon-nitrogen, carbon-oxygen, and carbon-sulfur bonds have been used as key transformations to construct these biologically important privileged heterocycles. This is the first example where the Mitsunobu approach has been utilized for the construction of S-amino acid based seven- and eight-membered ring systems.

Amino acid-based enantiomerically pure 3-substituted 1,4-benzodiazepin-2-ones: a new class of anti-ischemic agents.

A series of 3-substituted 1,4-benzodiazepin-2-ones derived from S and R amino acids were evaluated for their anti-ischemic activity in vitro. Treatment with compounds 7h, 16, 9d, and 17 decreased the apoptotic neuronal number, however increased the neuronal viability. The compounds decreasing apoptosis could protect neurons from the ischemic injury.

Diaryloxy methano phenanthrenes: a new class of antituberculosis agents.

A new series of diaryloxy methano phenanthrenes were prepared through tertiary-aminoalkylations of [(methoxy-phenyl)-phenanthren-9-yl-methyl]-phenols obtained from Friedel-Crafts alkylations on (methoxy-phenyl)-phenanthren-9-yl-methanols. These series of compounds were evaluated against Mycobacterium tuberculosis H37Rv and showed the desired activity in the range of 6.25 microg/mL in vitro.