(1) King crabs (Family Lithodidae) are among the world's largest arthropods, having a crab-like morphology and a strongly calcified exoskeleton.
(2) The anti-rickettsial activity of this drug was evaluated with regard to the determination of the numbers of surviving microorganism (LID100) and the in vivo concentration of erythromycin in both arthropod hosts.
(3) The method of detection of rickettsia in smears from the arthropods using the immunofluorescence technique and antibody response in mice inoculated with infected arthropods was found to be the most effective in these studies.
(4) The intensity of light for reliable cell killing (0.5 MW.m-2) was much greater than that used to kill arthropod neurones.
(5) The microsporidia are a group of unusual, obligately parasitic protists that infect a great variety of other eukaryotes, including vertebrates, arthropods, molluscs, annelids, nematodes, cnidaria and even various ciliates, myxosporidia and gregarines.
(6) These results suggest that the specificity of LAC virus-vector interactions is markedly influenced by the efficiency of the fusion function of the G1 envelope glycoprotein operating at the midgut level in the arthropod vector.
(7) Domestic swine were housed in four pens under controlled conditions to document arthropod transmission of vesicular stomatitis virus.
(8) The 12 additional arthropod species recorded from the woodland mice consisted of 1 nidicolous beetle, Leptinus orientamericanus; 1 bot, Cuterebra fontinella; 3 fleas, Ctenophthalmus pseudagyrtes, Orchopeas leucopus and Peromyscopsylla scotti; 1 tick, Dermacentor variabilis; 2 mesostigmatid mites, Androlaelaps fahrenholzi and Ornithonyssus bacoti; 3 chiggers, Comatacarus americanus, Euschoengastia peromysci, and Leptotrombidium peromysci; and 1 undescribed pygmephorid mite of the genus Pygmephorus.
(9) Lyme borreliosis is a protean infection caused by B burgdorferi, a recently recognized arthropod-borne spirochete.
(10) The first is characterized by afferent synapses to the brain with, in the sensory pedicle endings, structures similar to the presynaptic ribbons noted by some authors in photoreceptors of arthropods.
(11) The method is convenient, and could be useful for the study of arthropod neuromuscular junctions in general, since their nerve terminals do not release acetylcholine as a transmitter and cannot be stained by the more commonly used cholinesterase methods.
(12) The arthropod-borne virus (arbovirus) diseases of livestock have worldwide impact.
(13) These include gap junctions with features characteristic of arthropods, which seem to assemble by lateral migration of 13-nm E face intramembranous particles (IMPs), which ultimately cluster to form a large number of mature plaques of varying diameters.
(14) Histopathological examination of skin biopsies demonstrated changes compatible with arthropod hypersensitivity.
(15) Dr Umair A Shah, executive director of the Harris County department of public health, said, “It’s probably not a case of if we get Zika in our native mosquitoes, it’s probably a case of when we get Zika in our native mosquitoes.” Zika is a subtropical virus transmitted by the Aedes aegypti and Aedes albopictus mosquitoes, part of a group of diseases known as arboviruses, short for arthropod-borne viruses.
(16) A phylogenetic tree constructed from these sequences shows that the family evolved from a common ancestral gene that came into existence at about the time of arthropod and chordate divergence.
(17) The paper ends with identification keys for both adult and immature stages as well as for arthropod indoor fecal traces.
(18) Presence of organophosphates in arthropod larvae has not been documented previously and the analysis of larvae from decomposing remains may prove a useful technique for detection of these toxicants in decomposing remains.
(19) In arthropods, reflex modulation can occur in the sensory receptors themselves and in neurons that discharge during locomotion.
(20) The inhibition assay for mite allergen was reproducible in the presence of protein concentrations of added plant, fungal, arthropod and animal extracts in excess of the protein concentrations that occur under the operational mite assay conditions.
Rhabdom
Definition:
(n.) One of numerous minute rodlike structures formed of two or more cells situated behind the retinulae in the compound eyes of insects, etc. See Illust. under Ommatidium.
Example Sentences:
(1) On dark-adaptation of the 11-day adult eye, the rhabdomers move towards the cuticle.
(2) The rhabdom of the larval eye, if cut longitudinally, exhibits a "banded" structure over its entire length; in the adult the banded part is confined to the distal end, and the rhabdom is tiered.
(3) In all other ommatidia, the proximal parts of the rhabdoms show radially arranged microvilli, whereas the distal parts may reveal different patterns, frequently with microvilli in two directions or sometimes even in one direction.
(4) A calculation of the theoretical field size of individual retinula cells from measurments of refractive index and lens dimensions predicts that cells which participate in the central rhabdom will have acceptance angles near 3 degrees.
(5) All retinula cells run the entire length from the cone to the basal lamina, although two, called the proximal cells, only contribute to the lowest third of the rhabdom, and one of either cell 6 or cell 7 on our arbitrary numbering system forms its axon one third the way up the ommatidium.
(6) In the dark, a distinct gradient of activity was observed with radioactivity concentrated distally and declining toward the proximal end of the rhabdome.
(7) An admittance function was defined as the percentage of the rays reaching the rhabdom with respect to those entering the ommatidium.
(8) In spite of a one h exposure to light, rhabdom microvilli show no disintegration or disruption of membranes.
(9) The rhabdom of isolated small photoreceptors is surrounded by a calyx originating from the soma, so that it appears to be located internally.
(10) After 1-h illumination (225-320 lux), further reduction of rhabdom diameter was modest in control retinae but precipitate in those treated with OKA.
(11) Foot cells which lie immediately below the rhabdom also contain similar junctions and actin is tentatively identified in these cells.
(12) Three different fractions of visual cell fragments were prepared from the retina: the MV-fraction containing the rhabdomal microvilli, and the PVH- and PVL-fractions containing the photic vesicles located in the visual cell body.
(13) Sometimes seven and sometimes eight retinular cells closely appose the proximal tip of the cone and bear the microvilli of the rhabdom.
(14) Rhabdom sizes were not compromised by OKA, nor by either of the two protein kinase activators, SC-9 or PDA when each was deployed alone in darkness.
(15) A clear zone between dioptric structures and the rhabdom layer is absent.
(16) In Loricera and Agonum roots at the level of the proximal rhabdom are not continuous with the rootlets or short roots associated with the centrioles.
(17) In both cases, microvilli of the rhabdom were severely disrupted and the retinular cytoplasm contained numerous multivesicular bodies.
(18) Exposure to light seems to activate a transport mechanism that results in the redistribution of retinoid between the inner segments and rhabdomes and chromophore exchange among the photopigments.
(19) Quantification of the electron microscopic autoradiograms revealed that labeling of the cytoplasm was greater than the rhabdome at 2, 5, and 30 minutes and reached a peak at 12 hours.
(20) Extensive areas of gap junctions which occur between the rhabdoms and the membranes of large and small cells suggest that the cells may be electrically coupled to one another.