Abstract: Particles having an ACE2 targeting moiety attached to an outer surface thereof are disclosed herein. The ACE2 targeting moiety comprises a polypeptide comprising an amino acid sequence of SARS CoV-2 receptor-binding domain (RBD), wherein said amino acid sequence comprises a modification at position 358 and at least two additional modifications at two positions selected from the group consisting of 484, 498 and 501. Uses of the particles for treatment and diagnosis of diseases are also disclosed.

Abstract: A polypeptide comprising an amino acid sequence of SARS CoV-2 receptor-binding domain (RBD) is disclosed, wherein said amino acid sequence comprises a modification at position 358 and at least two additional modifications at two positions selected from the group consisting of 484, 498 and 501, wherein the polypeptide binds soluble, monomeric angiotensin-converting enzyme 2 (ACE2) receptor. Uses thereof are further disclosed.

Abstract: A method for monitoring species of algae for stress comprises growing a test set of algae of a given species, applying a stress of a predetermined kind to some of the algae, and irradiating the algae at a predetermined first set of wavelengths. The algae are then monitored at a predetermined second set of wavelengths to detect fluorescence and/or absorbance carried out on the first set of wavelengths by the stressed algae. The detected fluorescence and/or absorbance is compared for each irradiation wavelength between the stressed algae and unstressed algae to find signs indicating the applied stress. There is then a stage of searching through combinations of respective irradiation wavelengths and detected wavelengths to find a minimal set of irradiating and detected wavelengths that detects the stress. The smallest size set is then used in irradiating further sets of algae of the tested species to detect the given stress.

Abstract: A method for trapping of a plurality of charged particles in a charged particle trap. The trap includes first and second electrode mirrors having a common optical axis, the mirrors being arranged in alignment at two extremities thereof. The mirrors are capable, when voltage is applied thereto, of creating respective electric fields defined by key field parameters. The electric fields are configured to reflect charged particles causing their oscillation between the mirrors. The method includes introducing into the trap, along the optical axis, the plurality of charged particles as a beam having pre-determined key beam parameters. The method further includes choosing the key field parameters for at least one of the mirrors such as to induce bunching among charged particles in the beam.

Abstract: A method for trapping of a plurality of charged particles in a charged particle trap. The trap includes first and second electrode mirrors having a common optical axis, the mirrors being arranged in alignment at two extremities thereof. The mirrors are capable, when voltage is applied thereto, of creating respective electric fields defined by key field parameters. The electric fields are configured to reflect charged particles causing their oscillation between the mirrors. The method includes introducing into the trap, along the optical axis, the plurality of charged particles as a beam having pre-determined key beam parameters. The method further includes choosing the key field parameters for at least one of the mirrors such as to induce bunching among charged particles in the beam.