journal
MENU ▼
Read by QxMD icon Read
search

Journal of Morphology

journal
https://www.readbyqxmd.com/read/28922458/developmental-mechanisms-of-longitudinal-stripes-in-the-japanese-four-lined-snake
#1
Arata Murakami, Masami Hasegawa, Takeo Kuriyama
The developmental mechanisms of color patterns formation and its evolution remain unclear in reptilian sauropsids. We, therefore, studied the pigment cell mechanisms of stripe pattern formation during embryonic development of the snake Elaphe quadrivirgata. We identified 10 post-ovipositional embryonic developmental stages based on external morphological characteristics. Examination for the temporal changes in differentiation, distribution, and density of pigment cells during embryonic development revealed that melanophores first appeared in myotome and body cavity but not in skin surface at Stage 5...
September 18, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28921628/who-wins-in-the-weaning-process-juvenile-feeding-morphology-of-two-freshwater-mussel-species
#2
Rafael Araujo, Miquel Campos, Carles Feo, Catuxa Varela, Joaquín Soler, Paz Ondina
The global decline of freshwater mussels can be partially attributed to their complex life cycle. Their survival from glochidium to adulthood is like a long obstacle race, with juvenile mortality as a key critical point. Mass mortality shortly after entering into a juvenile state has been reported in both wild and captive populations, thus weakening the effective bivalve population. A similar phenomenon occurs during metamorphosis in natural and hatchery populations of juvenile marine bivalves. Based on a morphological analysis using scanning electron microscopy of newly formed juveniles of the freshwater species Margaritifera margaritifera (L...
September 18, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28921597/ultrastructure-of-spermatozoa-of-spider-crabs-family-mithracidae-crustacea-decapoda-brachyura-integrative-analyses-based-on-morphological-and-molecular-data
#3
Camila de O Assugeni, Tatiana Magalhães, Juan A Bolaños, Christopher C Tudge, Fernando L Mantelatto, Fernando J Zara
Recent studies based on morphological and molecular data provide a new perspective concerning taxonomic aspects of the brachyuran family Mithracidae. These studies proposed a series of nominal changes and indicated that the family is actually represented by a different number and representatives of genera than previously thought. Here, we provide a comparative description of the ultrastructure of spermatozoa and spermatophores of some species of Mithracidae in a phylogenetic context. The ultrastructure of the spermatozoa and spermatophore was observed by scanning and transmission electron microscopy...
September 18, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28914464/expression-of-caveolin-1-in-the-interfollicular-but-not-the-follicle-associated-epithelial-cells-in-the-bursa-of-fabricius-of-chickens
#4
Ildikó Bódi, Krisztina Minkó, Orsolya Fölker, Zsófia Benyeda, Balázs Felföldi, Attila Magyar, Anna Kiss, Vilmos Palya, Imre Oláh
The surface epithelium of the bursa of Fabricius consists of interfollicular (IFE) and follicle-associated epithelium (FAE). The IFE comprises (i) cylindrical-shaped secretory cells (SC) and (ii) cuboidal basal cells (BCs). The FAE provides histological and two-way functional connections between the bursal lumen and medulla of the follicle. We used a carbon solution and anti-caveolin-1 (Cav-1) to study the endocytic activity of FAE. Carbon particles entered the intercellular space of FAE, but the carbon particles were not internalized by the FAE cells...
September 15, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28914463/burrowing-with-a-kinetic-snout-in-a-snake-elapidae-aspidelaps-scutatus
#5
Alexandra Deufel
Of the few elongate, fossorial vertebrates that have been examined for their burrowing mechanics, all were found to use an akinetic, reinforced skull to push into the soil, powered mostly by trunk muscles. Reinforced skulls were considered essential for head-first burrowing. In contrast, I found that the skull of the fossorial shield-nosed cobra (Aspidelaps scutatus) is not reinforced and retains the kinetic potential typical of many non-fossorial snakes. Aspidelaps scutatus burrows using a greatly enlarged rostral scale that is attached to a kinetic snout that is independently mobile with respect to the rest of the skull...
September 15, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28914460/structure-of-supporting-elements-in-the-dorsal-fin-of-percid-fishes
#6
Alexander F Weickhardt, Kara L Feilich, George V Lauder
The dorsal fin is one of the most varied swimming structures in Acanthomorpha, the spiny-finned fishes. This fin can be present as a single contiguous structure supported by bony spines and soft lepidotrichia, or it may be divided into an anterior, spiny dorsal fin and a posterior, soft dorsal fin. The freshwater fish family Percidae exhibits especially great variation in dorsal fin spacing, including fishes with separated fins of varying gap length and fishes with contiguous fins. We hypothesized that fishes with separated dorsal fins, especially those with large gaps between fins, would have stiffened fin elements at the leading edge of the soft dorsal fin to resist hydrodynamic loading during locomotion...
September 15, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28914457/gross-brain-morphology-of-the-armoured-catfish-rineloricaria-heteroptera-isbr%C3%A3-cker-and-nijssen-1976-siluriformes-loricariidae-loricariinae-a-descriptive-and-quantitative-approach
#7
Arturo Angulo, Francisco Langeani
The gross morphology of the brain of Rineloricaria heteroptera and its relation to the sensory/behavioural ecology of the species is described and discussed. The sexual and ontogenetic intraspecific variation in the whole brain length and mass, as well as within/between the eight different brain subdivisions volumes, is also examined and discussed. Negative allometry for the whole brain length/mass and relative growth of the telencephalon and optic tecta was observed. Positive allometry was observed for the relative growth of the olfactory bulbs and medulla oblongata...
September 15, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28914456/ovarian-structure-and-oogenesis-of-the-extremophile-viviparous-teleost-poecilia-mexicana-poeciliidae-from-an-active-sulfur-spring-cave-in-southern-mexico
#8
Aarón Torres-Martínez, Arlette Hernández-Franyutti, Mari Carmen Uribe, Wilfrido Miguel Contreras-Sánchez
The structure of the ovary and oogenesis of Poecilia mexicana from an active sulfur spring cave is documented. Poecilia mexicana is the only poeciliid adapted to a subterranean environment with high hydrogen sulfide levels and extreme hypoxic conditions. Twenty females were captured throughout one year at Cueva del Azufre, located in the State of Tabasco in Southern Mexico. Ovaries were processed with histological techniques. P. mexicana has a single, ovoid ovary with ovigerous lamella that project to the ovarian lumen...
September 15, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28898452/distinct-histomorphology-for-growth-arrest-and-digitate-outgrowth-in-cultivated-haliclona-sp-porifera-demospongiae
#9
Rodrigo Wanick, Claudia Mermelstein, Ivone R Andrade, Ricardo E Santelli, Rodolfo P R Paranhos, Cristiano C Coutinho
The use of sponges in biotechnological processes is limited by the supply problem, and sponge biomass production is becoming a current topic of research. The distinction between characteristics for growth and growth arrest is also important for environmental monitoring. In this study, we analyze the morphology of the digitate outgrowths from the sponge Haliclona sp. The sponge Haliclona sp. was successfully cultivated for 14 months in a closed system. The morphological characterization of growth arrest was performed after submitting explants to starvation-stress for approximately 2 weeks, to correlate morphology with growth and growth arrest...
September 12, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28898451/comparative-ultrastructure-of-coxal-glands-in-unfed-larvae-of-leptotrombidium-orientale-schluger-1948-trombiculidae-and-hydryphantes-ruber-de-geer-1778-hydryphantidae
#10
Andrey B Shatrov
Coxal glands of unfed larvae Leptotrombidium orientale (Schluger, 1948) (Trombiculidae), a terrestrial mite parasitizing vertebrates, and Hydryphantes ruber (de Geer, 1778) (Hydryphantidae), a water mite parasitizing insects were studied using transmission electron microscopy. In both species, the coxal glands are represented by a paired tubular organ extending on the sides of the brain from the mouthparts to the frontal midgut wall and are formed of the cells arranged around the central lumen. As in other Parasitengona, the coxal glands are devoid of a proximal sacculus...
September 12, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28898441/three-dimensional-reconstruction-of-the-pharyngeal-gland-cells-in-the-predatory-nematode-pristionchus-pacificus
#11
Metta Riebesell, Ralf J Sommer
Pristionchus pacificus is a model system in evolutionary biology and for comparison to Caenorhabditis elegans. As a necromenic nematode often found in association with scarab beetles, P. pacificus exhibits omnivorous feeding that is characterized by a mouth-form dimorphism, an example of phenotypic plasticity. Eurystomatous animals have a dorsal and a sub-ventral tooth enabling predatory feeding on other nematodes whereas stenostomatous animals have only a dorsal tooth and are microbivorous. Both mouth forms of P...
September 12, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28846140/an-examination-of-surface-epithelium-structures-of-the-embryo-across-the-genus-poeciliopsis-poeciliidae
#12
Tami M Panhuis, Megan Fris, Laura Tuhela, Lucia Kwan
In viviparous, teleost fish, with postfertilization maternal nutrient provisioning, embryonic structures that facilitate maternal-fetal nutrient transfer are predicted to be present. For the family Poeciliidae, only a handful of morphological studies have explored these embryonic specializations. Here, we present a comparative morphological study in the viviparous poeciliid genus, Poeciliopsis. Using microscopy techniques, we examine the embryonic surface epidermis of Poeciliopsis species that vary in their level of postfertilization maternal nutrient provisioning and placentation across two phylogenetic clades and three independent evolutionary origins of placentation...
August 28, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28755396/allometry-and-morphometrics-of-clypeal-membrane-size-and-shape-in-nicrophorus-coleoptera-silphidae
#13
Jillian D Wormington, Barney Luttbeg
Contests between same-sex opponents over resources necessary for reproduction, as well interactions used to discern mate quality, often involve exaggerated traits wherein large individuals have disproportionately larger traits. This positive allometric scaling of weapons or signals facilitates communication during social interactions by accentuating body size differences between individuals. Typically, males carry these exaggerated traits, as males must compete over limited female gametes. However, in Nicrophorus beetles both males and females engage in physical contests over the vertebrate carcasses they need to provision and raise offspring...
July 29, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28744949/identification-of-a-new-mineralized-tissue-in-the-notochord-of-reared-siberian-sturgeon-acipenser-baerii
#14
Amandine Leprévost, Thierry Azaïs, Michael Trichet, Jean-Yves Sire
In a study aiming to improve knowledge on the mineralization of the axial skeleton in reared Siberian sturgeon (Acipenser baerii Brandt, 1869), we discovered a new mineralized tissue within the notochord. To our knowledge, such a structure has never been reported in any vertebrate species with the exception of the pathological mineralization of the notochord remains in degenerative intervertebral disks of mammals. Here, we describe this enigmatic tissue using X-ray microtomography, histological analyses and solid state NMR-spectroscopy...
July 25, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28744917/the-vocal-sac-of-hylodidae-amphibia-anura-phylogenetic-and-functional-implications-of-a-unique-morphology
#15
Agustin J Elias-Costa, Rachel Montesinos, Taran Grant, Julián Faivovich
Anuran vocal sacs are elastic chambers that recycle exhaled air during vocalizations and are present in males of most species of frogs. Most knowledge of the diversity of vocal sacs relates to external morphology; detailed information on internal anatomy is available for few groups of frogs. Frogs of the family Hylodidae, which is endemic to the Atlantic Forest of Brazil and adjacent Argentina and Paraguay, have three patterns of vocal sac morphology-that is, single, subgular; paired, lateral; and absent. The submandibular musculature and structure of the vocal sac mucosa (the internal wall of the vocal sac) of exemplar species of this family and relatives were studied...
July 25, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28726276/the-colonic-groove-of-the-plains-viscacha-lagostomus-maximus-histochemical-evidence-of-an-abrupt-change-in-the-glycosylation-pattern-of-goblet-cells
#16
María Florencia Tano de la Hoz, Mirta Alicia Flamini, Carolina Natalia Zanuzzi, Alcira Ofelia Díaz
The ascending colon of most rodent species shows a longitudinal colonic groove that works as a retrograde transport pathway for a mixture of bacteria and mucus toward the cecum. We describe the morphology and glycosylation pattern of the colonic groove of Lagostomus maximus to analyze the role of mucins in this anatomical feature. We also studied the distribution pattern of the interstitial cells of Cajal (ICC) to evaluate their regulatory influence on gut motility. The groove originated near the cecocolic junction and extended along the mesenteric side of the ascending colon, limited at both ends by nonpapillated ridges...
July 20, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28722165/dimorphic-ejaculates-and-sperm-release-strategies-associated-with-alternative-mating-behaviors-in-the-squid
#17
Lígia H Apostólico, José E A R Marian
Sperm competition is a powerful postcopulatory selective force influencing male adaptations associated with increasing fertilization success, and it is usually related to the evolution of different strategies of ejaculate expenditure between individuals. Ejaculates may also be influenced by additional selective pressures associated with sperm competition, such as timing between insemination and fertilization, female reproductive tract morphology, and fertilization environment. Also, males that adopt alternative mating tactics may face distinct sperm competition pressures, which may lead to the evolution of intraspecific diversity in ejaculates...
July 18, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28710876/trunk-elongation-and-ontogenetic-changes-in-the-axial-skeleton-of-triturus-newts
#18
Petar Govedarica, Milena Cvijanović, Maja Slijepčević, Ana Ivanović
Body elongation in vertebrates can be achieved by lengthening of the vertebrae or by an increase in their number. In salamanders, longer bodies are mostly associated with greater numbers of vertebrae in the trunk or tail region. However, studies on the relative contribution of the length of single vertebra to body elongation are lacking. In this study, we focus on evolutionary and ontogenetic changes in differentiation of the trunk vertebrae and the relative contribution of individual vertebrae to trunk lengthening in Triturus newts, a monophyletic group of salamanders that shows remarkable disparity in body shape...
July 15, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28707769/embryonic-development-of-eucorydia-yasumatsui-asahina-with-special-reference-to-external-morphology-insecta-blattodea-corydiidae
#19
Mari Fujita, Ryuichiro Machida
As the first step in the comparative embryological study of Blattodea, with the aim of reconstructing the groundplan and phylogeny of Dictyoptera and Polyneoptera, the embryonic development of a corydiid was examined and described in detail using Eucorydia yasumatsui. Ten to fifteen micropyles are localized on the ventral side of the egg, and aggregated symbiont bacterial "mycetomes" are found in the egg. The embryo is formed by the fusion of paired blastodermal regions, with higher cellular density on the ventral side of the egg...
July 14, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28707347/interspecific-variation-in-the-tetradactyl-manus-of-modern-tapirs-perissodactyla-tapirus-exposed-using-geometric-morphometrics
#20
Jamie A MacLaren, Sandra Nauwelaerts
The distal forelimb (autopodium) of quadrupedal mammals is a key morphological unit involved in locomotion, body support, and interaction with the substrate. The manus of the tapir (Perissodactyla: Tapirus) is unique within modern perissodactyls, as it retains the plesiomorphic tetradactyl (four-toed) condition also exhibited by basal equids and rhinoceroses. Tapirs are known to exhibit anatomical mesaxonic symmetry in the manus, although interspecific differences and biomechanical mesaxony have yet to be rigorously tested...
July 13, 2017: Journal of Morphology
journal
journal
24464
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"