134,054 research outputs found
Die Familie Pfeiffer
No full textDIE FAMILIE PFEIFFER
Die Familie Pfeiffer ( - )
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Vorwort (V)
Inhaltsverzeichnis (IX)
I. Lebensbilder ( - )
Johann Jakob Pfeiffer (1)
Burchard Wilhelm Pfeiffer (6)
Karl Jonas Pfeiffer (24)
Georg Pfeiffer (38)
Die Zwillingsbrüder Franz und Christian Pfeiffer (44)
Assessor Karl Pfeiffer (58)
Dr. Louis Pfeiffer (61)
Friedrich Pfeiffer (71)
Konrad Heinrich Pfeiffer (84)
II. Stammbäume (89)
A. Der Familie Pfeiffer (91)
B. Verwandter Familien (131)
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Gulella : Pfeiffer 1856
No full textGenus Gulella Pfeiffer, 1856 Gulella: Pfeiffer 1856 a: 173. Type species Pupa menkeana Pfeiffer, 1853 [S.D. Martens 1860: 298].Published as part of Herbert, D. G. & Rowson, B., 2011, Pupa menkeana Pfeiffer, 1853, type species of the speciose land snail genus Gulella Pfeiffer, 1856: correction of longstanding PLVLGHQWL ¿ FDWLRQ DQG GHVLJQDWLRQ RI QHRW \ SH (Mollusca: Eupulmonata: Streptaxidae), pp. 233 in African Invertebrates 52 (2) on page 234, DOI: 10.5733/afin.052.0201, http://zenodo.org/record/791721
Gesangschule
No full textBeylage A XV geistliche Lieder (zum Schulgebrauch) von Hans Georg NägeliBeylage B > Vaterunser von I.H. von Wessenberg ; in Musik gesetzt von Hans Georg NägeliBeylage C (nicht erschienen)Die Stimmen sind separat erschienenvon Pfeiffer und Nägeli"Mit drey Beylagen vierstimmiger Gesänge"Originaltitel: Vollständige und ausführliche Gesangschule. Hauptabt. 1, Gesangbildungslehre nach Pestalozzischen Grundsätze
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
Gesangschule
No full textHauptabt. 1 Gesangbildungslehre nach Pestalozzischen GrundsätzenHauptabt. 1, Beil. A XXX einstimmige Singstücke von Hans Georg NägeliHauptabt. 1, Beil. B XXX zweystimmige Gesänge von Hans Georg NägeliHauptabt. 1, Beil. C XXX dreystimmige Gesänge von Hans Georg NägeliHauptabt. 2 Chorgesangschule (mit "Chorgesänge zur Chorgesangschule" [14])Hauptabt. 2, Beil. A, Heft 1 Gesangbildungslehre für den Männerchor (30 Elementar-Gesänge ; 36 Lieder und Rundgesänge für den Männerchor) von Hans Georg NägeliHauptabt. 2, Beil. A, Heft 2 XV vierstimmige Männerchöre von Hans Georg NägeliDie Stimmen sind separat erschienenpädagogisch begründet von Michael Traugott Pfeiffer ; methodisch bearb. von Hans Georg Nägel
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
Evaluation of binocular eye trackers and algorithms for 3D gaze interaction in virtual reality environments
No full textPfeiffer T, Latoschik ME, Wachsmuth I. Evaluation of binocular eye trackers and algorithms for 3D gaze interaction in virtual reality environments. JVRB - Journal of Virtual Reality and Broadcasting. 2008;5(16):1660.Tracking user's visual attention is a fundamental aspect in novel human-computer interaction paradigms found in Virtual Reality. For example, multimodal interfaces or dialogue-based communications with virtual and real agents greatly benefit from the analysis of the user's visual attention as a vital source for deictic references or turn-taking signals. Current approaches to determine visual attention rely primarily on monocular eye trackers. Hence they are restricted to the interpretation of two-dimensional fixations relative to a defined area of projection. The study presented in this article compares precision, accuracy and application performance of two binocular eye tracking devices. Two algorithms are compared which derive depth information as required for visual attention-based 3D interfaces. This information is further applied to an improved VR selection task in which a binocular eye tracker and an adaptive neural network algorithm is used during the disambiguation of partly occluded objects
X- and Y-chromosome specific variants of the amelogenin gene allow sex determination in sheep (<it>Ovis aries</it>) and European red deer (<it>Cervus elaphus</it>)
No full textAbstract Background Simple and precise methods for sex determination in animals are a pre-requisite for a number of applications in animal production and forensics. However, some of the existing methods depend only on the detection of Y-chromosome specific sequences. Therefore, the abscence of a signal does not necessarily mean that the sample is of female origin, because experimental errors can also lead to negative results. Thus, the detection of Y- and X-chromosome specific sequences is advantageous. Results A novel method for sex identification in mammals (sheep, Ovis aries and European red deer, Cervus elaphus) is described, using a polymerase chain reaction (PCR) and sequencing of a part of the amelogenin gene. A partial sequence of the amelogenin gene of sheep and red deer was obtained, which exists on both X and Y chromosomes with a deletion region on the Y chromosome. With a specific pair of primers a DNA fragment of different length between the male and female mammal was amplified. Conclusion PCR amplification using the amelogenin gene primers is useful in sex identification of samples from sheep and red deer and can be applied to DNA analysis of micro samples with small amounts of DNA such as hair roots as well as bones or embryo biopsies.</p
Diplopoma turritum Pfeiffer 1852
No full textDiplopoma turritum (Pfeiffer, 1852) Figure 11 G–H Type material. ? NHMUK unnumbered (1), from Cuming collection bearing Pfeiffer’s handwriting labeled “Dyson, Honduras,” but does not match figure in Pfeiffer (1854 a) (see Remarks);? UMMZ 77930 (1), syntype. Type locality. “ Honduras.” Type figured. Pfeiffer, 1854 a: pl. 41, figs. 1, 2. Chresonymy. Chondropoma ? turritum Pfeiffer, 1851: 173 [nomen nudum]. Chondropoma ? turritum Pfeiffer, 1852 a: 289; Pfeiffer, 1852 c: 45; Pfeiffer, 1865: 153; Bland, 1866: 61; Pfeiffer, 1876: 195; Watters, 2006: 525 –526. Cyclostomus turritum (Pfeiffer, 1852). Pfeiffer, 1852 d: 69. Cyclostoma turritum (Pfeiffer, 1852). Pfeiffer, 1853 b: 248; Pfeiffer, 1854 a: 310, pl. 41, figs. 1, 2; Pfeiffer, 1854 b: 310. Chondropoma turritum Pfeiffer, 1852. Adams & Adams, 1856: 296; Reeve, 1863 a: pl. 7, fig. 52; Martens, 1890: 19 –20; Solem, 1961: 204, 207, pl. 11, fig. 22, map 2; Thompson, 2011: 47 [possibly West Indian]. Cistula turritum (Pfeiffer, 1852). Fischer & Crosse, 1890: 218. Gouldipoma turritum (Pfeiffer, 1852). Watters, 2006: 72, 525– 526. Distribution and habitat. Unknown. Not reported since description. Description. Shell conic, high-spired, adnate. Only specimen seen 13.2 mm in length (decollate). Protoconch unknown, lost in adult. Teleoconch of 5.25 rounded whorls. Umbilicus narrow. Spiral sculpture of ca. 35 regularly spaced, low threads of equal thickness from suture into umbilicus. Axial sculpture of numerous closely spaced threads, slightly thicker than the spiral threads. Intersections of axial and spiral sculpture minutely beaded. Suture strongly indented. Tufts absent but every other axial thread is slightly expanded at the suture. Aperture oval. Inner lip absent. Outer lip narrowly expanded, very narrow facing umbilicus, adnate, scarcely auriculate posteriorly. Colored with a complex pattern, base color tan, axial threads white, with ca. 7 broken, narrow tan bands which extend to adapertural face of peristome. Operculum, radula, and anatomy unknown. Variation in specimens. Only the UMMZ specimen was examined. Comparison with other species. This species resembles no other Central American annulariid. Remarks. The NHMUK specimen, collected by Dyson, does not closely match Pfeiffer’s 1854 figures. In addition, the specimen is accompanied by an operculum, but in the original description it is clear that Pfeiffer did not have a specimen with an operculum. Thompson (2011) suggested that this species was actually Parachondria canescens (Pfeiffer, 1852), a Cuban species, that had been introduced. Examination of the UMMZ specimen indicates that it is probably Diplopoma arangiana (Pfeiffer, 1857) from eastern Cuba, and is probably a mislabeled specimen. (If so, Chondropoma turritum Pfeiffer, 1852, would be the earliest name for that species.) Nevertheless, related Cuban species have turned up in some far flung places. Parachondria canescens occurs at Nassau, Bahamas, which Bartsch (1946) named subspecies nassauense, while admitting that it had possibly been introduced. It also occurs near Freetown, Eleuthera, Bahamas (Watters, unpubl.). The Hispaniolan species Parachondria salleanus (Pfeiffer, 1850) occurs on Sombrero Island in the British Virgin Islands (Watters, in press). All of these places experience a great deal of human traffic (Sombrero Island was mined for guano and was visited on a regular basis by ships and workers, Nassau and Eleuthera are popular destinations). These records undoubtedly are anthropogenic introductions but it is suspicious that they all involve two related species. Original description (translated here from Latin). “Shell nearly perforate, turreted, truncate, with elevated spiral lines and regular longitudinal ribs, white, banded with interrupted red lines; suture rather deep, with crowded denticulations; remaining 6 whorls slightly convex, regularly increasing, last rounded, base with strong spiral lirae; aperture vertical, oval, brown inside; peristome double: inner continuous, a little expanded, outer with top expanded angulate, right margin slightly expanded, columella and left cut.—Operculum?” 16 mm. Etymology. L. turritus —turreted.Published as part of Watters, G. Thomas, 2014, A revision of the Annulariidae of Central America (Gastropoda: Littorinoidea), pp. 301-350 in Zootaxa 3878 (4) on pages 345-347, DOI: 10.11646/zootaxa.3878.4.1, http://zenodo.org/record/25270
Pupa menkeana Pfeiffer, 1853, type species of the speciose land snail genus Gulella Pfeiffer, 1856: correction of longstanding PLVLGHQWL¿FDWLRQ DQG GHVLJQDWLRQ RI QHRW\SH (Mollusca: Eupulmonata: Streptaxidae)
No full textHerbert, D. G., Rowson, B. (2011): Pupa menkeana Pfeiffer, 1853, type species of the speciose land snail genus Gulella Pfeiffer, 1856: correction of longstanding PLVLGHQWL¿FDWLRQ DQG GHVLJQDWLRQ RI QHRW\SH (Mollusca: Eupulmonata: Streptaxidae). African Invertebrates 52 (2): 233, DOI: 10.5733/afin.052.0201, URL: http://www.bioone.org/doi/abs/10.5733/afin.052.020
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