22,316 research outputs found
Generalized measures for physical properties of nonperiodic chains
No full textPT: J; CR: AVISHAI Y, 1990, PHYS REV B, V41, P5492 BORN M, 1965, PRINCIPLES OPTICS BURROWS BL, 1991, J PHYS A-MATH GEN, V24, P3979 DAVISON SG, 1992, BASIC THEORY SURFACE GUMBS G, 1989, J PHYS A-MATH GEN, V22, P951 KIANG D, 1990, AM J PHYS, V58, P1200 KOHMOTO M, 1987, PHYS REV LETT, V58, P2436 KOLAR M, 1991, PHYS REV B, V43, P1034 PATTNAIK RK, 1992, J PHYS A-MATH GEN, V25, P577 THAKUR PK, 1992, J PHYS-CONDENS MAT, V4, P6095; NR: 10; TC: 5; J9: PHYS REV B; PG: 7; GA: QL717Source type: Electronic(1
Facial musculature in the rhesus macaque (Macaca mulatta): evolutionary and functional contexts with comparisons to chimpanzees and humans
No full textFacial expression is a common mode of visual communication in mammals but especially so in primates. Rhesus macaques (Macaca mulatta) have a well‐documented facial expression repertoire that is controlled by the facial/mimetic musculature as in all mammals. However, little is known about the musculature itself and how it compares with those of other primates. Here we present a detailed description of the facial musculature in rhesus macaques in behavioral, evolutionary and comparative contexts. Formalin‐fixed faces from six adult male specimens were dissected using a novel technique. The morphology, attachments, three‐dimensional relationships and variability of muscles were noted and compared with chimpanzees (Pan troglodytes) and with humans. The results showed that there was a greater number of facial muscles in rhesus macaques than previously described (24 muscles), including variably present (and previously unmentioned) zygomaticus minor, levator labii superioris alaeque nasi, depressor septi, anterior auricularis, inferior auricularis and depressor supercilii muscles. The facial muscles of the rhesus macaque were very similar to those in chimpanzees and humans but M. mulatta did not possess a risorius muscle. These results support previous studies that describe a highly graded and intricate facial expression repertoire in rhesus macaques. Furthermore, these results indicate that phylogenetic position is not the primary factor governing the structure of primate facial musculature and that other factors such as social behavior are probably more important. The results from the present study may provide valuable input to both biomedical studies that use rhesus macaques as a model for human disease and disorder that includes assessment of facial movement and studies into the evolution of primate societies and communication
Measurement of disorder in non-periodic sequences
No full textAn information theoretic measure is introduced to compare the disorder in non-periodic sequences. It is shown that the measure correctly distinguishes quasiperiodic and aperiodic sequences which have been deduced from earlier studies using diffraction patterns, although it is often necessary to use a set of measures, depending on the order of the source used. The particular sequences studied are the Thue-Morse sequence and the generalizations of the golden mean sequence commonly studied in connection with quasicrystals.PT: J; CR: ALI MK, 1988, PHYS REV B, V38, P7091 BOMBIERI E, 1986, J PHYS-PARIS, V47, P19 BOMBIERI E, 1987, CONT MATH, V64, P241 BURROWS BL, 1989, INT J MATH ED SCI TE, V20, P913 CHENG Z, 1988, PHYS REV B, V37, P4375 GUMBS G, 1988, J PHYS A, V21, L517 GUMBS G, 1988, PHYS REV LETT, V60, P1081 GUMBS G, 1989, J PHYS A-MATH GEN, V22, P951 HAMMING RW, 1980, CODING INFORMATION T HOLZER M, 1988, PHYS REV B, V38, P1709 HOLZER M, 1988, PHYS REV B, V38, P5756 KOLAR M, 1990, PHYS REV B, V41, P7108 KOLAR M, 1991, PHYS REV B, V43, P1034 MA HR, 1988, J PHYS C SOLID STATE, V21, P4311 MERLIN R, 1985, PHYS REV LETT, V55, P1768 MORSE M, 1921, AM J MATH, V43, P35 MORSE M, 1921, T AM MATH SOC, V22, P84 NIU Q, 1986, PHYS REV LETT, V57, P2057 PENROSE R, 1974, B I MATH APPL, V10, P266 QIN MG, 1990, J PHYS-CONDENS MAT, V2, P1059 RIKLUND R, 1987, INT J MOD PHYS B, V1, P121 SHANNON CE, 1949, MATH THEORY COMMUNIC SHECHTMAN D, 1984, PHYS REV LETT, V53, P1951 THUE A, 1906, NORSKE VID SELSK IMN, V7, P1 THUE A, 1912, NORSKE VID SELSK IMN, V1, P1; NR: 25; TC: 13; J9: J PHYS-A-MATH GEN; PG: 9; GA: GC466Source type: Electronic(1
Protecting Animals 36: Author Witi Ihimaera
No full textIn this very special episode of Knowing Animals I am joined by beloved New Zealand author Witi Ihimaera. Witi has written many books featuring nonhuman animals. He offers us a non-colonial lens through which to think about the human/nonhuman relationship
Characterization of specificity of bacterial community structure within the burrow environment of the marine polychaete Hediste (Nereis) diversicolor
No full textBioturbation is known to stimulate microbial communities, especially in macrofaunal burrows where the abundance and activities of bacteria are increased. Until now, these microbial communities have been poorly characterized and an important ecological question remains: do burrow walls harbor similar or specific communities compared with anoxic and surface sediments? The bacterial community structure of coastal sediments inhabited by the polychaete worm Hediste diversicolor was investigated. Surface, burrow wall and anoxic sediments were collected at the Carteau beach (Gulf of Fos, Mediterranean Sea). Bacterial diversity was determined by analyzing small subunit ribosomal RNA (16S rRNA) sequences from three clone libraries (168, 179 and 129 sequences for the surface, burrow wall and anoxic sediments, respectively). Libraries revealed 306 different operational taxonomic units (OTUs) belonging to at least 15 bacterial phyla. Bioinformatic analyses and comparisons between the three clone libraries showed that the burrow walls harbored a specific bacterial community structure which differed from the surface and anoxic environments. More similarities were nevertheless found with the surface assemblage. Inside the burrow walls, the bacterial community was characterized by high biodiversity, which probably results from the biogeochemical heterogeneity of the burrow system
Characteristics, location, and usage patterns of resting burrows in Chinese pangolins: Insights from radio-telemetry tracking
No full textThe Chinese pangolin Manis pentadactyla, a burrowing mammal, relies on burrows for foraging, shelter, and rearing its young. Pangolin burrows are typically classified as either resting (or resident) or feeding burrows. Resting burrows, in particular, are crucial for the pangolin’s survival, offering shelter, protection, and stability for the pangolin, especially during colder months and breeding seasons. Consequently, understanding the characteristics and usage patterns of resting burrows is critical for effective in-situ and ex-situ conservation efforts. This study assessed the density of resting burrows using sign surveys along line transects in a fragmented agricultural landscape. Additionally, radio telemetry was employed to specifically locate and characterize the resting burrows of seven Chinese pangolins (1 male and 6 females), as well as to analyze their usage patterns. The results revealed a burrow density of 110.8 per ha, with no significant variation across different environments. However, Chinese pangolins preferred resting burrows in areas with minimal human disturbance. Over tracking periods ranging from 52 to 327 days, female pangolins used between 12 and 32 resting burrows, while a single male pangolin used 48 resting burrows. Pangolins occupied individual burrows for up to 10 days during colder months and breeding seasons. Notably, resting burrows were frequently shared among individuals. Activity patterns showed that pangolins typically exited their burrows between 6:00 PM and 12:00 AM and entered their burrows between 10:00 PM and 4:00 AM. To conclude the findings:1) burrow count, while useful for identifying pangolin presence, is not a suitable quantitative indicator of population density. 2) Most resting burrows had compacted soil at the entrance, which could be mistaken for old or inactive burrows in other studies. 3) Resting burrows function as permanent structures that are reused across seasons instead of seasonal adaptations. 4) Preserving low-disturbance habitats will be critical for ensuring sufficient resting burrow sites, thereby supporting the long-term viability of pangolin populations. These results provide valuable insights into the usage patterns of resting burrows, thus enriching the understanding of pangolin behavior, ecological requirements and conservation strategies for this endangered species
Burrows with resources have greater visitation and may enhance mange transmission among wombats
No full textEnvironmental exposure to Sarcoptes scabiei mites in burrows is considered the dominant mechanism of sarcoptic mange transmission among wombats. We document elevated activity of bare-nosed wombats at a burrow with subterranean water access relative to burrows without this resource, suggesting that some burrows may contribute more to mange transmission than others
Orientation and external morphology of burrows of the mangrove crab Ucides cordatus (Crustacea: Brachyura: Ucididae)
No full textThe aim of the present study was to characterize the external morphology and the orientation of burrows constructed by the mangrove crab Ucides cordatus. Data were obtained from two mangrove forests of similar vegetation dominance (Laguncularia racemosa) but differing in flooding heights. These mangroves were located near Barra de Icapara, Iguape City (SP), Brazil, (24 degrees 50'36 '' S-47 degrees 59'53'W). A total of 221 burrows were examined (120 on the high mangrove and 101 on the low mangrove). External morphology of the burrows was recorded by photographs for categorization and description. The directions of the burrow openings were recorded using a geological compass and the declivities of the ducts were measured with a clinometer. Females constructed 70.8% at Site A and 69.4% at Site B of the occupied burrows with the opening facing the margin of the river (P 0.05) at either site. In females, the tendency for burrow orientation possibly has a reproductive connotation as larval dispersal may be favoured and enhanced by the tides. Four groups of distinct tracks related to the morphotypes and developmental stages of U. cordatus were observed, No sediment constructions associated with the burrows were recorded for this species. Declivity of the burrows from juveniles was lower than from adults (P < 0.05), probably caused by the differential growth of the chelipeds in this species.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)UNESP, BR-11330900 Sao Vicente, SP, BrazilGrp Pesquisa Biol Crustaceos CRUSTA, BR-69100000 Itacoatiara, AM, BrazilUniv Estado Amazonas, Ctr Estudos Super Itacoatiara, BR-69100000 Itacoatiara, AM, BrazilUNESP, BR-11330900 Sao Vicente, SP, BrazilFAPESP: 02/05614-2FAPESP: 05/00269-
I Think I Am Philip K. Dick
No full textFor years, noted writer Laurence A. Rickels often found himself compared to novelist Philip K. Dickthough in fact Rickels had never read any of the science fiction writers work. When he finally read his first Philip K. Dick novel, while researching for his recent book The Devil Notebooks , it prompted a prolonged immersion in Dicks writing as well as a recognition of Rickelss own long-documented intellectual pursuits. The result of this engagement is I Think I Am: Philip K. Dick , a profound thought experiment that charts the wide relevance of the pulp sci-fi author and paranoid visionary. I Think I Am: Philip K. Dick explores the science fiction authors meditations on psychic reality and psychosis, Christian mysticism, Eastern religion, and modern spiritualism. Covering all of Dicks science fiction, Rickels corrects the lack of scholarly interest in the legendary Californian author and, ultimately, makes a compelling case for the philosophical and psychoanalytic significance of Philip K. Dicks popular and influential science fiction.Intro -- Contents -- Introjection -- Part I -- Endopsychic Allegories -- Schreber Guardian -- Belief System Surveillance -- Part II -- Deeper Problems -- Veil of Tears -- Go West -- Dick Manfred -- Timing -- Glimmung -- Part III -- Spiritualism Analogy -- Imitating the Dead -- Indexical Layer -- Ilse -- Hammers and Things -- Crucifictions -- Over There -- Martyrology -- Can't Live, Can't Live -- Lola -- Umwelt, Mitwelt, and Eigenwelt -- Outer Race -- The German Introject -- Part IV -- Materialism, Idealism, and Cybernetics -- Startling Stories -- A Couple of Years -- Android Empathy -- Homunculus and Robot -- ALL OF YOU ARE DEAD. I AM ALIVE. -- Go with the Flow -- Part V -- Room for Thought -- Caduceus -- Jump -- Still -- A Wake -- Spätwerk -- Let the Dead Be -- Play Bally -- Das Hund -- Notes -- BibliographyFor years, noted writer Laurence A. Rickels often found himself compared to novelist Philip K. Dickthough in fact Rickels had never read any of the science fiction writers work. When he finally read his first Philip K. Dick novel, while researching for his recent book The Devil Notebooks , it prompted a prolonged immersion in Dicks writing as well as a recognition of Rickelss own long-documented intellectual pursuits. The result of this engagement is I Think I Am: Philip K. Dick , a profound thought experiment that charts the wide relevance of the pulp sci-fi author and paranoid visionary. I Think I Am: Philip K. Dick explores the science fiction authors meditations on psychic reality and psychosis, Christian mysticism, Eastern religion, and modern spiritualism. Covering all of Dicks science fiction, Rickels corrects the lack of scholarly interest in the legendary Californian author and, ultimately, makes a compelling case for the philosophical and psychoanalytic significance of Philip K. Dicks popular and influential science fiction.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
Small carrion beetles (Coleoptera: Leiodidae: Cholevinae) from burrows of Geomys and Thomomys pocket gophers (Rodentia: Geomyidae) in the United States
No full textThe cholevine beetles inhabiting burrows of Geomys and Thomomys pocket gophers (Rodentia: Geomyidae) are reviewed. Catops geomysi n. sp. and Ptomaphagus geomysi n. sp. are described. Both of these species and Ptomaphagus schwarzi Hatch appear to be regular and obligate inhabitants of Geomys burrows b~t are not host specific. Nemadus hornii Hatch, Sciodrepoides watsoni horn ian us (Blanchard), Catops s~mplex Say, Ptomaphagus cavernicola Schwarz, Ptomaphagus consobrinus (LeConte), Ptomaphagus fisus Horn, and Ptomaphagus texanus Horn were less frequently collected and are probably facultative inhabitants of Geomys burrows, as well as nests or dens of other small mammals. Ptomaphagus nevadicus Horn is an inhabitant of ~)Urrows of Thomomys pocket gophers in western North America. A key to the species of Ptomaphagus III the southeastern Gulf Coastal Plain, from non-cave habitats, is provided to aid in their identification
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