We show the existence of a Hawking vector field in a full neighborhood of a local, regular, bifurcate, non-expanding horizon embedded in a smooth Einstein-Maxwell space-time without assuming the underlying space-time is analytic. It extends one result of Friedrich, Rácz and Wald, see [3], which was limited to the interior of the black hole region. Moreover, we also show, in the presence of an a...

The arrangement of fine hairs on the longitudinal and transverse flagella of Woloszynskia vticra is illustrated and discussed. Dilations of the nuclear envelope and endoplasmic reticulum in W. micra, similar in appearance and location to those containing flagellar hairs in other algal and fungal zoids, are found to contain bundles of fibrils. These fibrils are approximately the same width and l...

Hair is preserved for millennia in permafrost; it enshrines a record of biologic rhythms and offers a glimpse at chronobiology as it was in extinct animals. Here we compare biologic rhythms gleaned from mammoth's hairs with those of modern human hair. Four mammoths' hairs came from varying locations in Siberia 4600 km, four time zones, apart ranging in age between 18,000 and 20,000 years before...

Alopecia areata is an unpredictable, non-scarring hair loss condition. Patchy alopecia areata sparing gray hairs is rare. Here we present 4 cases with patchy non-scarring hair loss, which attacked pigmented hairs only and spared gray hairs. It should be differentiated from vitiligo, colocalization of vitiligo and alopecia areata, and depigmented hair regrowth after alopecia areata.

Cutaneous branches of the mylohyoid nerve were observed in both sides of 25 (83.3%) and in one side of 5 (16.7%) out of 30 crab-eating monkeys (Macaca fascicularis). The branch supply the skin and sinus hairs at the mental part. These sinus hairs seem to be the intermandibular sinus hairs according to the manner of nerve supply.

In this paper brief observations are made on the principal dimensions, cross-sectional shapes and cuticular scale patterns of hairs of the Tasmanian monotremes and marsupials. The observations on the cuticular scale patterns alone, without considering other elements of the hair shaft, are of only limited value in a comparative study of marsupial hairs. However, it is suggested that a detailed m...

Bats are the only mammals capable of powered flight, and they perform impressive aerial maneuvers like tight turns, hovering, and perching upside down. The bat wing contains five digits, and its specialized membrane is covered with stiff, microscopically small, domed hairs. We provide here unique empirical evidence that the tactile receptors associated with these hairs are involved in sensorimo...

Many arthropods use filiform hairs as mechanoreceptors to detect air motion. In common house crickets (Acheta domestica) the hairs cover two antenna-like appendages called cerci at the rear of the abdomen. The biomechanical stimulus-response properties of individual filiform hairs have been investigated and modeled extensively in several earlier studies. However, only a few previous studies hav...

Sinus hairs are tactile hairs of mammals, commonly also known as vibrissae or whiskers. The term “whisker” contemplates to the mystacial sinus hairs (mSH) in specific, which are situated around the snout of the animal. These mystacial sinus hairs can be moved actively to support and control sensing [1, 29]. The cyclic motion (whisking) of the mystacial sinus hairs was eponymous. In many species...