A facile synthesis of 3-6 nm, water dispersible, near-infrared (NIR) emitting, quantum dots (QDs) magnetically doped with Fe is presented. Doping of alloyed CdTeS nanocrystals with Fe was achieved in situ using a simple hydrothermal method. The magnetic quantum dots (MQDs) were capped with NAcetyl-Cysteine (NAC) ligands, containing thiol and carboxylic acid functional groups to provide stable aqueous dispersion. The optical and magnetic properties of the Fe doped MQDs were characterized using several techniques. The synthesized MQDs are tuned to emit in the Vis-NIR (530-738 nm) wavelength regime and have high quantum yields (67.5-10%). NIR emitting (738 nm) MQDs having 5.6 atomic% Fe content exhibited saturation magnetization of 85 emu/gm[Fe] at room temperature. Proton transverse relaxivity of the Fe doped MQDs (738 nm) at 4.7 T was determined to be 3.6 mM−1s−1. The functional evaluation of NIR MQDs has been demonstrated using phantom and in vitro studies. These water dispersible, NIR emitting and MR contrast producing Fe doped CdTeS MQDs, in unagglomerated form, have the potential to act as multimodal contrast agents for tracking live cells.

A biomimetic strategy to stabilize the activity of kinesin motors – a key component of molecular shuttles – against temperature changes is investigated but proves unsuccessful for this enzyme because the Km of Drosophila kinesin‐1 and Thermomyces kinesin‐3 is independent of temperature in the range of 19–34 °C (see image).

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We report a case of intraconal grease gun injury along with traumatic optic neuropathy in a 20-year-old male. He presented with dimness of vision and proptosis of the left eye (LE) following an accidental injury at work place. The computer tomography of orbit revealed hypodense grease orbit. Cream colored grease was continually exuding from the conjunctival wound. Patient improved rapidly after the surgical removal of the grease by anterior orbitotomy. Grease gun injuries to the orbit have rarely been reported. The present case is the eighth report throughout the world, and the first in India as per our knowledge.