336 research outputs found
First person – Lauren Falkenberg
No full textFirst Person is a series of interviews with the first authors of a selection of papers published in Disease Models & Mechanisms, helping early-career researchers promote themselves alongside their papers. Lauren Falkenberg is first author on ‘
Ccdc103 promotes myeloid cell proliferation and migration independent of motile cilia’, published in DMM. Lauren is a MD/PhD student in the lab of Joshua S. Waxman at Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA, investigating the intersection of rare disease biology, human genetics and immunology
Comparison of conventional and total reflection excitation geometry for fluorescence -ray absorption spectroscopy on droplet samples
No full textX-ray absorption fine structure (XAFS) experiments in fluorescence mode have been performed in total reflection excitation geometry and conventional 45°/45° excitation/detection geometry for comparison. The experimental results have shown that XAFS measurements are feasible under normal total reflection X-ray fluorescence (TXRF) conditions, i.e. on droplet samples, with excitation in grazing incidence and using a TXRF experimental chamber. The application of the total reflection excitation geometry for XAFS measurements increases the sensitivity compared to the conventional geometry leading to lower accessible concentration ranges. However, XAFS under total reflection excitation condition fails for highly concentrated samples because of the self-absorption effect
Comparison of synchrotron radiation total reflection X-ray fluorescence excitation–detection geometries for samples with differing matrices
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Parameter study of self-absorption effects in Total Reflection X-ray Fluorescence–X-ray Absorption Near Edge Structure analysis of arsenic
No full textTotal reflection X-ray Fluorescence (TXRF) analysis in combination with X-ray Absorption Near Edge
Structure (XANES) analysis is a powerful method to perform chemical speciation studies at trace element
levels. However, when measuring samples with higher concentrations and in particular standards, damping
of the oscillations is observed. In this study the influence of self-absorption effects on TXRF–XANES
measurements was investigated by comparing measurements with theoretical calculations. As(V) standard
solutions were prepared at various concentrations and dried on flat substrates. The measurements showed a
correlation between the damping of the oscillations and the As mass deposited. A Monte-Carlo simulation
was developed using data of the samples shapes obtained from confocal white light microscopy. The results
showed good agreement with the measurements; they confirmed that the key parameters are the density of
the investigated atom in the dried residues and the shape of the residue, parameters that combined define
the total mass crossed by a certain portion of the incident beam. The study presents a simple approach for
an a priori evaluation of the self-absorption in TXRF X-ray absorption studies. The consequences for Extended
X-ray Absorption Fine Structure (EXAFS) and XANES measurements under grazing incidence conditions are
discussed, leading to the conclusion that the damping of the oscillations seems to make EXAFS of
concentrated samples non feasible. For XANES “fingerprint” analysis samples should be prepared with a
deposited mass and sample shape leading to an acceptable absorption for the actual investigation
The problem of prostitution in the medieval Cracow. Iudicium de aedificandis domis pro meretricibus by John Falkenberg
No full textThe author focuses on the question of prostitution in the medieval Cracow in the light of edited-by- himself treaty by John Falkenberg Iudicium de aedificandis domis pro meretricibus. Writing his treaty Falkenberg was trying, at the request of the Municipal Council, answer the following questions: do laws established by people allow the existence of prostitutes, and: can the ruler of the city or councillors build brothels, put prostitutes there and then profit from such business. The text contains a short review of the problem of prostitution in Cracow of that time as well as the explanati of a context in which Falkenberg’s work was written. In the last part of the article, the author presents a two-part edition of the treaty
Avian magnetoreception: elaborate iron mineral containing dendrites in the upper beak seem to be a common feature of birds
No full textThe magnetic field sensors enabling birds to extract orientational information from the Earth’s magnetic field have remained enigmatic. Our previously published results from homing pigeons have made us suggest that the iron containing sensory dendrites in the inner dermal lining of the upper beak are a candidate structure for such an avian magnetometer system. Here we show that similar structures occur in two species of migratory birds (garden warbler, Sylvia borin and European robin, Erithacus rubecula) and a non-migratory bird, the domestic chicken (Gallus gallus). In all these bird species, histological data have revealed dendrites of similar shape and size, all containing iron minerals within distinct subcellular compartments of nervous terminals of the median branch of the Nervus ophthalmicus. We also used microscopic X-ray absorption spectroscopy analyses to identify the involved iron minerals to be almost completely Fe III-oxides. Magnetite (Fe II/III) may also occur in these structures, but not as a major Fe constituent. Our data suggest that this complex dendritic system in the beak is a common feature of birds, and that it may form an essential sensory basis for the evolution of at least certain types of magnetic field guided behavior
Servants of the devil or protectors of Christianity and apostles among pagans? Shaping the image of Poland and Poles in the context of steps taken by Wladyslaw II Jagiello’s diplomacy against ‘Satira’ by John Falkenberg
No full textThe author analyses the legal action of the Polish delegation against the Satira by Dominican friar John Falkenberg, which appeared at the Council of Constance (1414–1418). In his work, Falkenberg called for the extermination of the Polish nation as well as the king Wladyslaw Jagiello. He announced that those who would achieve this aim would attain salvation. The Polish delegation, especially Paul Włodkowic and archbishop Nicolas Trąba, made efforts aimed at the recognition of the Dominican’s work as heretical. Falkenberg was arrested and his work was condemned by the Commission of Faith, however it was not recognized as heretical. The new pope Martin V, in turn, did not want the verdict of the commission to become a resolution of the Council. In response, Poles, despite the threat of anathema, at the last session of the Council, appealed against the Satira to the next council, which undermined the authority of the pope. In the article, the author shows the factors which prevented Poles from achieving complete success in the Falkenberg case. He addresses the question whether the determination of the Polish envoys in the defence of honour of their ruler and state in the final days of the council brought positive results in the years after the council. The author gives consideration to the question whether the actions of Polish diplomacy against ‘Satira’ combined with other steps on the international forum contributed to a certain extent to creating Jagiello’s image as the last apostle of the barbarian Europe
Stagmatoptera supplicaria
No full textStagmatoptera supplicaria (Burmeister, 1838) (Fig. 149) Mantis (Acontistes) supplicaria Burmeister, 1838: 542. = Mantis flavipennis Audinet-Serville, 1838: 128. Type locality. Unknown (Rodrigues & Cancello 2016). Records. MUSM: ♂, 230 m, lux, 27.IX.2016, leg. M. Falkenberg, M. Schlemm & R. Mörtter (ex. SMNK); 2 ♂♂, 230 m, lux, 28.IX.2016, leg. M. Falkenberg, M. Schlemm & R. Mörtter (ex. SMNK); 2 ♂♂, 230 m, lux, 02.X.2016, leg. M. Falkenberg, M. Schlemm & R. Mörtter (ex. SMNK); 2 ♂♂, 230 m, lux, 07.X.2016, leg. M. Falkenberg, M. Schlemm & R. Mörtter (ex. SMNK); ♂, 230 m, lux, 09.X.2016, leg. M. Falkenberg, M. Schlemm & R. Mörtter (ex. SMNK). NMB: ♂, 230 m, lux, leg. E.-G. Burmeister, 20. IX.–09.X.2007 (QR-NMB-Mant 1569, ex. ZSM). SMNK: ♂, 230 m, lux, 17.II.1984, leg. M. Verhaagh (SMNK-Mant 09690); ♂, 230 m, 26.IX.2014, leg. R. Mörtter (SMNK-Mant 12800); ♂, 230 m, lux, 28.IX.2014, leg. M. Falkenberg (SMNK-Mant 12548); ♂, 260 m, lux, 07.X.2016, leg. R. Mörtter (SMNK-Mant 12873); 4 ♂♂, 230 m, lux, 16.IV.2018, leg. M. Falkenberg (SMNK-Mant 12793–12796); 3 ♂♂, 230 m, lux, 17.IV.2018, leg. M. Falkenberg (SMNK-Mant 12797–12799); 3 ♂♂, 230 m, 14.IV.2018, leg. R. Mörtter (SMNK-Mant 12801–12803). ZSM: ♂, 230 m, lux, 20.IX.–09.X.2007, leg. E.-G. Burmeister, E. Diller, O. Gruler, M. Breitsameter & T. Kothe (genitalia preparation Rodrigues #GM0070); ♂, 230 m, lux, 20.IX.–09.X.2007, leg. E.-G. Burmeister; 4 ♂♂, 230 m, lux, 02.–18.X.2009, leg. E.-G. Burmeister; ♂, 230 m, lux, V.2013, leg. E. Diller. CSC: ♂, 230 m, lux, 17.IV.2018, leg. M. Falkenberg (ex. SMNK); ♂, 230 m, 20.IX.–06.X.2013, leg. E. Diller (ex. ZSM). Distribution. Bolivia, Brazil, Colombia, Ecuador, French Guiana, Peru, Suriname, Trinidad & Tobago, Venezuela (Rodrigues & Cancello 2016). Remarks. As pointed out by Rodrigues & Cancello (2016), Burmeister (1838) has to be credited as the author of the species, not Stoll (1813). While a female of St. supplicaria is figured in both Stoll (1787) and the 1813 reprint, it is misidentified as St. precaria (Linnaeus, 1758). Very common at the study site.Published as part of Schwarz, Christian J., Ehrmann, Reinhard, Stiewe, Martin B. D., Mörtter, Rolf & Falkenberg, Michael, 2020, Mantodea of Panguana (Insecta: Dictyoptera), pp. 1-66 in Zootaxa 4824 (1) on pages 43-44, DOI: 10.11646/zootaxa.4824.1.1, http://zenodo.org/record/440199
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