Abstract: A case for an electronic device such as a head-mounted device may have a main housing portion that separates an interior region from a surrounding exterior region. The main housing portion may have an opening through which the head-mounted device is received into the interior region. Flexible protruding portions of the main housing portion may form a flexible tab and a flexible flap. To make size adjustments to the interior region, the flexible tab may slide within an opening in a cover. The cover may be configured to move between an open position in which the opening is uncovered and a closed position in which the head-mounted device is enclosed within the interior region by the main housing portion and the cover. Deformable protrusions in the case may be used to seal openings in the head-mounted device when the device is in the interior region.

Abstract: A method for detecting an analyte in a plant is provided. The method includes injecting an analyte-capture agent into a leaf of a plant, and in the leaf, optically detecting complexes formed by capturing an analyte with the injected analyte-capture agent. The analyte-capture agent can include an analyte-interacting component connected to a microcarrier. In particular versions, the analyte-capture agent can be an analyte specific antibody or aptamer, and the microcarrier can be a polydiacetylene liposome. Binding of the analyte can cause a change in color of the liposome, thus indicating the presence of the analyte.