134,104 research outputs found
Tlacuatzin Voss and Jansa 2003
No full textGenus <i>Tlacuatzin</i> Voss and Jansa, 2003 <p> TYPE SPECIES: <i>Didelphis</i> (<i>Micoureus</i>) <i>canescens</i> J.A. Allen, 1893, by original designation.</p> <p>SYNONYMS: None.</p> <p> REMARKS: See Voss and Jansa (2009) for an emended generic description. The relationships of <i>Tlacuatzin</i> within the tribe Marmosini have yet to be satisfactorily resolved, although the largest concatenated-gene dataset yet analyzed (Amador and Giannini, 2016) suggests that it is the sister group to <i>Marmosa.</i></p> <p> Arcangeli et al. (2018) recognized five species of this Mexican endemic genus based on phylogenetic analyses of sequence data from one mitochondrial gene (cytochrome <i>b</i>) and one nuclear gene (IRBP). Unfortunately, only cytochrome <i>b</i> was taxonomically informative, and taxonomic differences in morphological traits were not convincingly documented. In the absence of compelling evidence for nucleargene divergence, the following taxa are perhaps nothing more than mtDNA haplogroups; alternatively, they might be treated as subspecies. However, until relevant phenotypic analyses or additional genetic analyses are carried out, I list them here as valid species.</p>Published as part of <i>Voss, Robert S., 2022, An Annotated Checklist Of Recent Opossums (Mammalia: Didelphidae), pp. 1-77 in Bulletin of the American Museum of Natural History 2022 (455)</i> on page 30, DOI: 10.1206/0003-0090.455.1.1, <a href="http://zenodo.org/record/7161371">http://zenodo.org/record/7161371</a>
Abstract shapes of RNA
No full textGiegerich R, Voss B, Rehmsmeier M. Abstract shapes of RNA. Nucleic Acids Research. 2004;32(16):4843-4851.The function of a non-protein-coding RNA is often determined by its structure. Since experimental determination of RNA structure is time-consuming and expensive, its computational prediction is of great interest, and efficient solutions based on thermodynamic parameters are known. Frequently, however, the predicted minimum free energy structures are not the native ones, leading to the necessity of generating suboptimal solutions. While this can be accomplished by a number of programs, the user is often confronted with large outputs of similar structures, although he or she is interested in structures with more fundamental differences, or, in other words, with different abstract shapes. Here, we formalize the concept of abstract shapes and introduce their efficient computation. Each shape of an RNA molecule comprises a class of similar structures and has a representative structure of minimal free energy within the class. Shape analysis is implemented in the program RNAshapes. We applied RNAshapes to the prediction of optimal and suboptimal abstract shapes of several RNAs. For a given energy range, the number of shapes is considerably smaller than the number of structures, and in all cases, the native structures were among the top shape representatives. This demonstrates that the researcher can quickly focus on the structures of interest, without processing up to thousands of near-optimal solutions. We complement this study with a large-scale analysis of the growth behaviour of structure and shape spaces. RNAshapes is available for download and as an online version on the Bielefeld Bioinformatics Server
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The cephalopod family Histioteuthidae (Oegopsida): systematics, biology, and biogeography
No full textThis study is based on the large, mostly unreported collections of histioteuthids that have accumulated since the family was first revised by Voss in 1969. Of primary importance are the collections made in 1971, 1973, 1975/1976, and 1979 by the R/V Walther Herwig and the R/V Anton Dohrn in the Atlantic and the worldwide collections found in nine Russian or former Russian institutions.
An investigation of the food and feeding of large juvenile to adult Histioteuthis celetaria pacifica (G. Voss, 1962) in the western Indian Ocean shows crustaceans and fishes to be the dominant items of prey and of about equal importance in the overall diet. The findings suggest that feeding occurs at approximately equal intensity in the sampled population near the bottom between 364 and 1000 m during both daytime and twilight. Maturity in the histioteuthids is accompanied by marked changes, not only in the genital organs, but also in the arms, especially arms I, which undergo marked secondary, symmetrical modification; in the photophores patterns, particularly on the arms and mantle where unusual, enlarged, darkly pigmented, simple
photophores of different sizes and shapes appear in some species; and in the shape of the gladius and mantle in one species. Characters important in distinguishing among taxa include the photophore patterns on the mantle, around the right eyelid and on the arms, the sculpture of the dorsal pad of the funnel organ, the sucker enlargement pattern on the club, the development and structure of the inner web, the number of elements and the attachments of the buccal membrane, the single or double nature of the male genetalia, the internal structure of the spermatophore, the
morphologies of the gladius and the lower beak, and the surface morphology of the skin.
We recognize 13 species of the family Histioteuthidae in a single genus. Subspecies are recognized in two of the species, Histioteuthis celetaria (G. Voss, 1960) and H. corona (Voss and Voss, 1962), and the available material suggests that more than one taxon is represented in at least two other species, H. reversa (Verrill, 1880) and H. bonnellii (Ferussac, 1834). A key to the species and
subspecies is given. Histioteuthis elongata (Voss and Voss, 1962) is the mature stage of H. reversa. The cosmopolitan, warm-water species H. hoylei (Goodrich, 1896), more commonly known in recent literature as H. dofleini (Pfeffer, 1912), comprises two separate, closely related species, H. hoylei in the Pacific and Indian oceans and//, arcturi (Robson, 1948) in the Atlantic. Investigation
failed to clearly distinguish the two nominal subspecies of H. bonnellii, H. b. bonnellii and H. b. corpuscula Clarke, 1980, so H. bonnellii is restored, for the time being, to the status of an undivided species with two discrete, ecologically distinct northern and southern populations. A survey of the large new collections of H. meleagroteuthis (Chun, 1910) confirms that//, bruuni N. Voss, 1969, is a variant form of, and synonymous with, the senior species.
Five species groups are characterized: the H. reversa species group, comprising H. reversa, H. atlantica (Hoyle, 1885), and H. eltaninae (N. Voss, 1969); the H. hoylei species group, comprising H. hoylei and//, arcturi; the//, bonnellii species group, comprising H. bonnellii and H. macrohista (N. Voss, 1969); the H. Miranda species group, comprising H. miranda (Berry, 1918) and the recently resurrected H. oceani (Robson, 1948); and the H. meleagroteuthis species group, comprising H. meleagroteuthis and H. heteropsis (Berry, 1913). Of the two species not belonging to a currently recognized group, H. corona and H. celetaria, a future, more detailed study than was possible with the available material of H. celetaria will probably result in the elevation of its two
subspecies to the specific level, and together they will form the sixth distinct group of closely related species in the family. The distributional patterns nearly equal the number of taxa. The patterns show (1) a close correspondence with patterns of variations in environmental conditions in the oceans; (2) the important role of
productivity on the formation of the patterns and in the
determination of the abundance of a taxon within its range; and (3) the contiguous nature of the patterns of members of a species group or of subspecies of a polytypic, widespread species. Only three of the eight warm-water species in the family inhabit all three oceans, and of the three cosmopolites, only one is regarded as an undivided
species. Of the four species or subdivisions of a species that have Southern Ocean-related patterns, two are typically circumglobal, and two are semicircumglobal. For the latter pair, the broad expanse of low nutrient waters of the central Pacific appears to act as an east-west barrier for dispersal. Although there are no strictly
cold-water species or recognized subspecies in the northern
hemisphere, two histioteuthids normally extend from warm water into north temperate or subarctic waters in the Atlantic. A tendency for some species or subdivisions of a species to be present in the eastern half of the Atlantic and absent in the western half is shared by both groups. The distributions of the four histioteuthids that are
confined to the Pacific appear to be more restricted than are the distributions of purely Atlantic taxa. The differences in the patterns appear to reflect important hydrographical differences between the two oceans
A newborn with very rare von Voss-Cherstvoy syndrome and literature review
No full textDeepak Sharma,1 Basudev Gupta,2 Sweta Shastri,3 Pradeep Sharma4 1Department of Pediatrics, Pt. Bhagwat Dayal Sharma Post Graduate Institute of Medical Sciences, Rohtak, 2Department of Pediatrics, Civil Hospital, Palwal, Haryana, 3Department of Pathology, N.K.P. Salve Medical College, Nagpur, Maharashtra, 4Department of Medicine, Mahatma Gandhi Medical College and Research Institute, Jaipur, Rajasthan, India Introduction: von Voss-Cherstvoy syndrome is a part of a group of syndromes with radial and hematologic abnormalities, and until now approximately ten cases have been reported in the literature. This syndrome is characterized by a triad of radial ray defects, occipital encephalocele, and urogenital abnormalities.Case presentation: We report a neonate from Indian ethnicity who was diagnosed with von Voss-Cherstvoy syndrome. The neonate had radial ray defect, occipital encephalocele, tetralogy of Fallot, and bilateral agenesis of kidney, ureter, and bladder. The neonate was suspected to have von Voss-Cherstvoy syndrome on the basis of clinical features, which was further confirmed by fibroblast analysis showing somatic mosaicism for del(13q).Conclusion: von Voss-Cherstvoy syndrome is a very rare syndrome that can be suspected on the basis of typical clinical features and confirmed by fibroblast analysis showing somatic mosaicism for del(13q). This adds a second case of this chromosome anomaly described in this syndrome. Keywords: von Voss-Cherstvoy syndrome, radial ray defects, occipital encephalocele, urogenital abnormalities, somatic mosaicism for del(13q
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
1959-61 -- Correspondence, NFIP -- letter, 1960-10-28
No full textLetter from Voss, George P. to Sabin, Albert B. dated 1960-10-28.Sabin Collection Fair Use Policy</a
Marmosops pakaraimae Voss 2013
No full text<i>Marmosops pakaraimae</i> Voss et al., 2013 <p>Figures 11–13</p> <p> <i>Marmosops pakaraimae</i> Voss et al., 2013: 6 (original description).</p> <p>TYPE MATERIAL: The holotype (by original designation) consists of the skin, skull, postcranial skeleton, and preserved tissues of an adult male (ROM 115129; original number F46739) collected by Burton K. Lim and Deirdre M. Jafferally on 26 February 2003 at “Second Camp” on Mount Roraima (fig. 10: locality 49), CuyuniMazaruni Region, Guyana. The other seven specimens listed below are all paratypes.</p> <p> DISTRIBUTION, HABITATS, AND SYMPATRY: <i>Marmosops pakaraimae</i> is currently known from just five localities, of which three are in the Pakaraima Highlands of western Guyana and two are in the adjacent highlands of eastern Venezuela. Recorded elevations at these localities range from 800 m to about 1500 m above sea level, and recorded habitats are premontane or lower montane rain forest (Voss et al., 2013). This species is not definitely known to occur sympatrically with any congeneric species, although it might be expected to come into contact with <i>M. parvidens</i> and/or <i>M. pinheiroi</i> at lower elevations in western Guyana or eastern Venezuela.</p> <p>DESCRIPTION: Body pelage dark brown (near Dark Umber) middorsally, but indistinctly paler laterally, and about 8–9 mm long at midback; ventral pelage superficially whitish (the ventral coloration contrasting abruptly with the brownish flanks), but hairs of throat, chest, abdomen, and inner surfaces of fore- and hind limbs uniformly gray based (only the apex of the chin, the oral margins, and the scrotum have self-white fur). Manus covered dorsally with uniformly pale hairs in some specimens (e.g., ROM 114698), but metacarpals distinctly darker than digits in others (ROM 115129); lateral carpal tubercles spoon shaped in all examined adult males. Mammary formula unknown (no female specimens examined). Tail much longer than combined length of head and body (mean LT/HBL × 100 = 148%); dorsal caudal surface uniformly dark from base to tip, but ventral surface indistinctly paler (especially near the base of the tail).</p> <p>Nasal bones long (consistently extending well behind the lacrimals) and much wider posteriorly than anteriorly (laterally expanded at the maxillary-frontal suture). Lacrimal foramina concealed from lateral view inside anterior orbital margin; zygomatic process of squamosal broadly overlapped dorsally by the jugal. Palatine fenestrae absent. Dorsolateral margin of ethmoid foramen formed by the orbitosphenoid.</p> <p> Upper canine (C1) short, with anterior and posterior accessory cusps in males (female specimens are unknown). Upper third molar (M3) anterolabial cingulum narrowly continuous with preprotocrista (anterior cingulum complete). Lower canine (c1) premolariform (procumbent, with posterior accessory cusp) and small, subequal in height to p1; c1 anterolingual accessory cusp absent. Entoconid of m1 apparently subequal to adjacent m2 paraconid; 3 unworn m4 talonid with three distinct cusps.</p> <p> COMPARISONS: <i>Marmosops pakaraimae</i> averages larger than <i>M. parvidens</i> in most measured external dimensions (table 2), and the two species differ strikingly in dorsal pelage coloration (dark brown in <i>pakaraimae</i> versus paler and distinctly reddish brown in <i>M. parvidens</i>; Voss et al., 2013: fig. 2). The difference in ventral pel-3 This character is difficult to evaluate because specimens with unworn molars (juveniles and subadults) are unavailable.</p> <p>TABLE 2</p> <p> <b>Measurements (mm) and Weights (g) of Adult Male Specimens of the Parvidens Group</b></p> <p> of <i>Marmosops</i> (<i>Sciophanes</i>)</p> <p> a The mean, the observed range (in parentheses), and the sample size are provided for each measurement of the type series (ROM 114698, 115129, 115148, 115254, 115841, 115845; USNM 385046).</p> <p> b The mean, the observed range (in parentheses), and the sample size are provided for each measurement of the following series: AMNH 93970, 267347, 267348, 267353, 267359, 267361; MNHN 1995-929, 1995-930, 1995-933; ROM 114144, 117348; USNM 579989.</p> <p> c The mean, the observed range (in parentheses), and the sample size are provided for each measurement of the following series: AMNH 266423, 267341, 267342, 267345, 267346, 267349, 267352, 267357; CM 63506; FMNH 95320; MNHN 1995-931, 1995-932; ROM 108920, 111558, 111663; USNM 461459, 461460, 461462–461465.</p> <p> age coloration (op. cit.: fig. 3) is even more striking: whereas <i>M. pakaraimae</i> has almost completely gray-based ventral fur, all examined specimens of <i>M. parvidens</i> have a continuous streak of self-whitish fur that extends from chin to groin. <i>Marmosops pakaraimae</i> is consistently larger than <i>parvidens</i> in all measured craniodental dimensions, especially in five variables (CBL, LIB, LPB, MTR, LM) that exhibit nonoverlapping variation between our male samples (no female specimens of <i>M. pakaraimae</i> are known). Side-by-side comparisons of representative skulls (figs. 11–13) reveal that <i>M. pakaraimae</i> has a visibly broader interorbital region but relatively smaller orbits than <i>M. parvidens</i>. In qualitative aspects of craniodental morphology, however, these species are notably similar, both having lacrimal foramina that are mostly concealed from lateral view inside the anterior orbital margin, upper third molars with narrowly complete anterior cingula, and consistently tricuspid m4 talonids.</p> <p> <i>Marmosops pakaraimae</i> also averages larger than <i>M. pinheiroi</i> in most external dimensions, and the two species differ in dorsal pelage color (dark brown in <i>M. pakaraimae</i> versus paler brownish gray in <i>M. pinheiroi</i>). The ventral fur of <i>M. pakaraimae</i> is also more extensively gray based than the ventral fur of <i>M. pinheiroi</i>, which usually includes a narrow, discontinuous midventral streak of selfwhite hairs. <i>Marmosops pakaraimae</i> is also larger on average than <i>M. pinheiroi</i> in craniodental measurements, especially in three dimensions (LIB, LPB, and LM) that exhibit nonoverlapping variation in our samples. Visual comparisons of representative skulls (figs. 11–13) reveal similar proportional differences between <i>M. pakaraimae</i> and <i>M. pinheiroi</i> to those previously noted between <i>M. pakaraimae</i> and <i>M. parvidens</i>, namely that <i>M. pakaraimae</i> has a relatively broader interorbit but smaller orbits. Additionally, the lacrimal foramina are more prominently exposed laterally, M3 never has a complete anterior cingulum, and m4 often has a bicuspid talonid in <i>M. pinheiroi</i>.</p> <p>TABLE 3</p> <p> <b>Measurements (mm) and Weights (g) of Adult Female Specimens of the Parvidens Group</b></p> <p> <b> of <i>Marmosops</i> (<i>Sciophanes</i>)</b> a</p> <p> a Female specimens of <i>Marmosops pakaraimae</i> are unknown.</p> <p> b The mean, the observed range (in parentheses), and the sample size are provided for each measurement of the following series: AMNH 97333, 267344; FMNH 18545; USNM 548439, 579990.</p> <p> c The mean, the observed range (in parentheses), and the sample size are provided for each measurement of the following series: AMNH 130570, 267342 267352; CM 63506; FMNH 95320; USNM 393529–393532, 461459, 461460, 461462, 461464, 461465, 545543.</p> <p> SPECIMENS EXAMINED (<i>N</i> = 8): <b>Guyana</b> — <i>Cuyuni-Mazaruni,</i> Mt. Roraima (ROM 115129, 115148, 115254); <i>Potaro-Siparuni,</i> Mt. Ayanganna (ROM 114698), Mt. Wokomung (ROM 115841, 115845). <b>Venezuela</b> — <i>Bolívar,</i> 85 km SSE El Dorado (USNM 385046), Churi-tepui (AMNH 176353).</p>Published as part of <i>Díaz-Nieto, Juan F. & Voss, Robert S., 2016, A Revision Of The Didelphid Marsupial Genus Marmosops, Part 1. Species Of The Subgenus Sciophanes, pp. 1-72 in Bulletin of the American Museum of Natural History 2016 (402)</i> on pages 18-21, DOI: 10.1206/0003-0090-402.1.1, <a href="http://zenodo.org/record/4612610">http://zenodo.org/record/4612610</a>
Air Force Contracts and Proposals -- 1951-1955 -- Correspondence, Military Service, Dengue -- letter, 1952-11-21
No full textLetter from Voss, F. F. to Sabin, Albert B. dated 1952-11-21.Sabin Collection Fair Use Policy</a
Towards discovering novel aspects of nuclear biology in the malaria parasite "Plasmodium falciparum"
No full textThe apicomplexan parasite P. falciparum continues to cause morbidity and mortality imposing a significant health and economic burden on human society. In light of antimalarial drug resistance and the lack of an effective vaccine there is an urgent need to understand the basic biology of Plasmodium parasites in much greater detail. In particular, basic nuclear processes such as those remain surprisingly unsought despite their importance in parasite survival and life cycle progression. Thus, identification and localisation of novel parasite proteins to areas of the nucleus is an important first step towards giving new insights into nuclear architecture and function. The main aim of this thesis was to compile an inventory of the nuclear proteome across the intra-erythrocytic cell cycle using high accuracy mass spectrometry coupled with bioinformatics and in vivo localisation experiments. The dataset was analysed for accuracy and retention of true nuclear proteins revealing a final list of 802 potential nuclear proteins with an estimated precision of 76%. Interestingly, the informational pool of this study was able to identify a large number of novel nuclear components including novel protein domains possibly involved in gene regulation, members of the nuclear pores, the nucleolus and the proteasome (chapter 2). Several transgenic parasite lines used for the experimental validation part of the nuclear core proteome were further investigated in more detail. One of these transgenic cell lines expresses the C-terminally tagged bromo-domain protein PF10_0328 and was investigated by co-immuoprecipitation experiments followed by LC-MS/MS to identify interacting proteins. Bromodomain proteins bind specifically to acetylated lysine residues in histone tails and are important regulators of transcription. Our results suggest that PF10_0328 acts in concert with two additional bromo-domain proteins in regulating transcription in P. falciparum (chapter 3). Further characterisation on the functional level of these three important regulators is currently ongoing in a collaborative effort. Characterisation of bromo-domain proteins could establish new intervention strategies against malaria as the recognition of acetylated histone tails by bromo-domains can be selectively prevented by small molecules. Furthermore, several proteins residing in the nuclear pores and the nucleolus of P. falciparum were used to visualise these structures in relation to chromosome end clusters based on fluorescence microscopy. We show that both structures, involved in nuclear-cytoplasmic trafficking and ribosomal biogenesis, respectively, do not appear to ‘cross-talk’ with silenced chromosome ends at the nuclear periphery of P. falciparum (chapter 4). In conclusion, I believe that my work about several aspects of gene regulation and nuclear architecture increases the understanding of the biology of this medically important pathogen and could have potential to identify new avenues for interventions against malaria
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