Evolution of myosin filament arrangements in vertebrate skeletal muscle.

abstract：:Adult female white-footed mice, Peromyscus leucopus, were exposed to long (LP) or short (SP) photoperiods for 6 weeks (experiment I). Another group of animals was kept for 6 weeks in SP, then injected SC with 30 micrograms prolactin twice daily for 2, 3, 4, or 6 days (experiment II). Ovaries from the mice in both expe...

journal_title：Journal of morphology

authors： Spanel-Borowski K,Bartke A,Petterborg LJ,Reiter RJ

更新日期：1983-05-01 00:00:00

abstract：:The abdominal cerci of the wood cricket, Nemobius sylvestris, are covered by a variety of hair-like sensilla that differ in length, thickness, and articulation. Fillings from the cercal nerves with cobalt chloride and fluorescent dyes revealed the projection of sensory axons into the terminal abdominal ganglion of the...

journal_title：Journal of morphology

authors： Insausti TC,Lazzari CR,Casas J

更新日期：2008-12-01 00:00:00

abstract：:Oribatida are one of the main groups of Acari comprising mostly important decomposers in soils. Most species are particle feeders, an exceptional mode of nutrition in Arachnida. Hence, their feeding organs, the gnathosoma, are of special functional interest. We studied nearly all components using scanning and transmis...

journal_title：Journal of morphology

authors： Alberti G,Heethoff M,Norton RA,Schmelzle S,Seniczak A,Seniczak S

更新日期：2011-09-01 00:00:00

abstract：:This study describes the male reproductive cycle of Sibynomorphus mikanii from southeastern Brazil considering macroscopic and microscopic variables. Spermatogenesis occurs during spring-summer (September-December) and spermiogenesis or maturation occurs in summer (December-February). The length and width of the kidne...

journal_title：Journal of morphology

authors： Rojas CA,Barros VA,Almeida-Santos SM

更新日期：2013-02-01 00:00:00

abstract：:The orbital Harderian gland of the common tree shrew (Tupaia glis) was investigated at the macroscopic and microscopic levels. In the glands of both sexes only one acinar cell type was found. The cell is characterized by the presence of numerous lipid vacuoles of variable size and by a small number of PAS-positive, el...

journal_title：Journal of morphology

authors： Pradidarcheep W,Asavapongpatana S,Mingsakul T,Poonkhum R,Nilbu-nga S,Somana R

更新日期：2003-03-01 00:00:00

abstract：:Burrow construction in the subterranean Ctenomys talarum (Rodentia: Ctenomyidae) primarily occurs by scratch-digging. In this study, we compared the limbs of an ontogenetic series of C. talarum to identify variation in bony elements related to fossorial habits using a morphometrical and biomechanical approach. Diamete...

journal_title：Journal of morphology

authors： Echeverría AI,Becerra F,Vassallo AI

更新日期：2014-08-01 00:00:00

abstract：:The structure of the thumus in adult specimens of a marine teleost, the cling fish Sicyases sanguineus, has been studied by light and transmission electron microscopy. Most cling fishes have an outer thymus located beneath the opercular epithelium. A few of them, however, have a large inner thymus besides a poorly dev...

journal_title：Journal of morphology

authors： Gorgollon P

更新日期：1983-07-01 00:00:00

abstract：:In this study, we compare and contrast armoring strategies during early ontogeny among three related species of marine turtles: the hawksbill, a species that diverged about 29 mya from the loggerhead and Kemp's ridley, which diverged from one another about 16 mya. Our purpose was to determine whether there was a corre...

journal_title：Journal of morphology

authors： Salmon M,Coppenrath C,Higgins B

更新日期：2018-09-01 00:00:00

abstract：:Prey capture in Agama stellio was recorded by high-speed video in combination with the electrical activity of both jaw and hyolingual muscles. Quantification of kinematics and muscle activity patterns facilitated their correlation during kinematic phases. Changes in angular velocity of the gape let the strike be subdi...

journal_title：Journal of morphology

authors： Herrel A,Cleuren J,De Vree F

更新日期：1995-06-01 00:00:00

abstract：:Despite the embryological and anatomical disparities present among lophotrochozoan phyla, there are morphological similarities in the cellular arrangements of ciliated cells used for propulsion among the nonfeeding larval forms of kamptozoans, nemerteans, annelids, mollusks, and bryozoans. Evaluating whether these sim...

journal_title：Journal of morphology

authors： Santagata S

更新日期：2008-03-01 00:00:00

abstract：:The morphology of the spermatozoon of representative species of the subfamily Nesomyinae (Muroidea: Nesomyidae), a monophyletic group of rodents endemic to Madagascar, was examined by light and electron microscopy to determine the sperm head shape and tail length across the species. Marked interspecific differences we...

journal_title：Journal of morphology

authors： Ding X,Leigh CM,Goodman SM,Bedford JM,Carleton MD,Breed WG

更新日期：2010-12-01 00:00:00

abstract：:The flagellum of the thysanopteran spermatozoon has been examined by electron microscopy and computer-aided image analysis. The flagellum consists of 27 microtubular elements that probably are formed as outgrowths from three separate basal bodies. Nine of the elements are normal microtubular doublets that carry dynein...

journal_title：Journal of morphology

authors： Dallai R,Afzelius BA,Lanzavecchia S,Bellon PL

更新日期：1991-09-01 00:00:00

abstract：:The structure and crystallography of the internal shell of the pulmonate gastropod slug Limax maximus were studied at the levels of light and scanning electron microscopy, revealing patterns of shell ontogeny and morphogenesis. The calcified portion of the slightly convex ovoid shell is composed of a single palisade l...

journal_title：Journal of morphology

authors： Furbish DR,Furbish WJ

更新日期：1984-06-01 00:00:00

abstract：:To provide basic data about bone resorbing cells in the skeleton during the life cycle of Danio rerio, larvae, juveniles, and adults (divided into six age groups) were studied by histological procedures and by demonstration of the osteoclast marker enzyme tartrate-resistant acid phosphatase (TRAP). Special attention w...

journal_title：Journal of morphology

authors： Witten PE,Hansen A,Hall BK

更新日期：2001-12-01 00:00:00

abstract：:A new morphological type of somatosensory organ is described. It is found in the glabrous skin of the dog nose (rhinarium or planum nasale) and situated in dermis papillae. The otherwise thick epidermis forms a thin window above the organ. There are only a few layers of keratinocytes in the window and the corneocytes ...

journal_title：Journal of morphology

authors： Elofsson R,Kröger RHH

更新日期：2020-03-01 00:00:00

abstract：:The usual pigmentation pattern in mammalian skin consists of fixed melanocytes in the basal layer of the epidermis, supplying keratinocytes with melanosomes. We observed that the glabrous skin (rhinaria and footpads) of dogs deviates from this pattern. In dogs, melanocytes are found in both the dermis and epidermis. T...

journal_title：Journal of morphology

authors： Elofsson R,Kröger RHH

更新日期：2018-08-01 00:00:00

abstract：:High speed cinematography was used to record the feeding activities of terrestrial Ambystoma tigrinum melanostictum. A description of these activities based on films of more than 50 feeding sequences is presented, and the mechanical units involved are defined, described, and functionally analyzed. Evolutionary implica...

journal_title：Journal of morphology

authors： Larsen JH Jr,Guthrie DJ

更新日期：1975-10-01 00:00:00

abstract：:The vomeronasal system consists of a peripheral organ and the connected central neuronal networks. The central connections are sexually dimorphic in rodents, and in some species, parameters of the vomeronasal organ (VNO) vary with sex, hormonal exposure, body size and seasonality. The VNO of the dasyurid marsupial mou...

journal_title：Journal of morphology

authors： Aland RC,Gosden E,Bradley AJ

更新日期：2016-11-01 00:00:00

abstract：:The larval epithelium of the sea urchin, Lytechinus pictus, consists of squamous cells and bands of columnar epithelial cells bearing cilia. During metamorphosis this tissue undergoes a series of rapid, complex changes. Through the scanning and transmission electron microscope, we describe and analyse these changes. T...

journal_title：Journal of morphology

authors： Cameron RA,Hinegardner RT

更新日期：1978-07-01 00:00:00

abstract：:Larval salivary gland cells of seven Drosophila species from the melanogaster group were studied during the early third-instar period. Similar cytoplasmic organization was seen in both the distal and proximal parts of the gland. The cytoplasm contained a large number of free ribosomes, but only a few rough endoplasmic...

journal_title：Journal of morphology

authors： Thomopoulos GN

更新日期：1988-10-01 00:00:00

abstract：:The morphology of the upper, lower, and pharyngeal jaws is very similar among American cichlids. Common conditions are: (1) the presence of a premaxillary dentigerous arm shorter than the ascending arm (exceptions are Astronotus, Cichla, and Crenicichla semifasciata), (2) a narrow coulter area; in contrast, a broad co...

journal_title：Journal of morphology

authors： Casciotta JR,Arratia G

更新日期：1993-07-01 00:00:00

abstract：:The fine structural characteristics of epithelial cells of the anal vesicle in the hymenopteran parasitoid, Microplitis croceipes (Cresson), are similar to those of transport cells. Apical and basal infoldings, an abundance of mitochondria, ribosomes, rough endoplasmic reticulum, Golgi complexes and pinocytotic vesicl...

journal_title：Journal of morphology

authors： Edson KM,Norton WN,Vinson SB

更新日期：1977-11-01 00:00:00

abstract：:Two types of sperm are produced in the silkworm, Bombyx mori. Nucleate eupyrene sperm is an ordinary sperm that contributes to fertilization, while anucleate apyrene sperm is considered to play important roles in assisting eupyrene sperm. At the very late stage of spermatogenesis, a phenomenon called "peristaltic sque...

journal_title：Journal of morphology

authors： Sahara K,Kawamura N

更新日期：2004-01-01 00:00:00

abstract：:The morphology of the musculature and connective tissues of the arms of Octopus bimaculoides was analyzed with light microscopy. We also studied O. briareus and O. digueti, which possess relatively more elongate and less elongate arms, respectively. The morphology of the arms was found to be remarkably uniform among s...

journal_title：Journal of morphology

authors： Kier WM,Stella MP

更新日期：2007-10-01 00:00:00

abstract：:Development of the yolk sac of squamate reptiles (lizards and snakes) differs from other amniote lineages in the pattern of growth of extraembryonic mesoderm, which produces a cavity, the yolk cleft, within the yolk. The structure of the yolk cleft and the accompanying isolated yolk mass influence development of the a...

journal_title：Journal of morphology

authors： Stewart JR,Russell KJ,Thompson MB

更新日期：2012-10-01 00:00:00

abstract：:The origins and evolution of the three major clades of modern amphibians are still a source of controversy, and no general consensus exists as to their relationship to the various known Paleozoic taxa. This may indicate that additional character complexes should be studied to resolve their phylogenetic relationship. T...

journal_title：Journal of morphology

authors： Sigurdsen T,Bolt JR

更新日期：2009-12-01 00:00:00

abstract：:Sexual selection can lead to rapid evolution of sexual traits and striking morphological diversity across taxa. In populations where competition for mates is intense, males sometimes evolve distinct behavioral strategies along with morphological differences that help them secure mating opportunities. Strong postcopula...

journal_title：Journal of morphology

authors： Gilman CA,Corl A,Sinervo B,Irschick DJ

更新日期：2019-02-01 00:00:00

abstract：:The brain-microvascular architecture of the newt (Triturus cristatus carnifex) was studied by scanning electron-microscopical examination of microvascular corrosion casts. It is characterized at the leptomeningeal level by a superficial network of single vessels that leave the meningeal sheath to form hairpin-shaped c...

journal_title：Journal of morphology

authors： Lazzari M,Ciani F,Franceschini V

更新日期：1991-12-01 00:00:00

abstract：:In uloborid spiders, eye loss is accompanied by increased visual angles, optical material investment, and potential visual acuity of the retained eyes. Relative to carapace volume, the six-eyed Hyptiotes cavatus and two four-eyed Miagrammopes species have greater retinal hemisphere areas and lens volumes than do the e...

journal_title：Journal of morphology

authors： Opell BD

更新日期：1988-05-01 00:00:00

abstract：:Histological and electron-microscopical studies of the head-kidney ontogenesis in a group of bottomspawner and mouthbrooder cichlid fishes reveal that this organ undergoes three functional and structural stages. At the initial stage, 2-12 days after fertilization, the head-kidney is a filtering organ of two glomeruli ...

journal_title：Journal of morphology

authors： Fishelson L

更新日期：1996-07-01 00:00:00