Magnitude and Composition of Sedentary Behavior in Older Adults Living in a Retirement Community.

High amount of sedentary behavior (SB) has been associated with a multitude of adverse health events in older adults. There are limited data regarding SB in older adults living in retirement communities (RC). This study described the magnitude and composition of SB [non-screen sedentary time (NSST) and screen sedentary time (SST)] in older adults living in a RC and documented variation in this behavior as a function of demographic, health, health behavior and clinical variables.

Movement of spermatozoa of Megaselia Scalaris (Diptera: Brachycera: Cyclorrhapha: Phoridae) in artificial and natural fluids.

In artificial fluid, the spermatozoa move as linear cells or round up and rotate, propelled by spontaneous bending of their tails. Both linear and rounded cells can move forward and backward, but usually they move forward. The tails of all cells display, simultaneously, small primary bends and fewer, much larger secondary bends.

Ultrastructure of the spermatozoon of Megaselia scalaris Loew (Diptera:Brachycera:Cyclorrhapha:Phoridea:Phoridae).

When viewed by scanning electron microscopy (SEM), the spermatozoon of the phorid dipteran Megaselia scalaris appears threadlike, lacking distinct head and tail areas. These areas can be observed, however, in appropriately stained material. Measurements of Feulgen-stained material reveal average lengths of the head, tail, and total cell of 18.

Ultrastructure of the larval salivary glands of Megaselia scalaris Loew (Diptera, Phoridae).

Each of the paired salivary glands of third instar larvae of the humpbacked fly Megaselia scalaris is a bag-like structure with a short neck region from which a single duct emerges. The two ducts form a common duct that empties into the ventral region of the pharynx near the mouthparts. The wall of the glands and ducts consists of a simple squamous epithelium that rests upon a connective tissue layer.