2,262 research outputs found
Redescription of Pseudotropheus livingstonii and Pseudotropheus elegans from Lake Malaŵi, Africa
No full textStauffer Jr, J. R., Konings, F., Ryan, T. M. (2016): Redescription of Pseudotropheus livingstonii and Pseudotropheus elegans from Lake Malaŵi, Africa. Zootaxa 4154 (2): 169-178, DOI: http://doi.org/10.11646/zootaxa.4154.2.
FIGURE 1 in Redescription of Pseudotropheus livingstonii and Pseudotropheus elegans from Lake Malaŵi, Africa
No full textFIGURE 1. Three-dimensional surface reconstructions of the skulls of the three holotypes, showing the position of the parasphenoid and the angle of the ethmo-vomerine bloc. 1a, Metriaclima lanisticola (BMNH1976.7.29.2), angle 48.7°; 1b, Pseudotropheus livingstonii (BMNH1863.11.12.22), angle 57°; 1c, P. e l e ga ns (BMNH1935.6.14.127), angle 58°.Published as part of Stauffer Jr, J. R., Konings, F. & Ryan, T. M., 2016, Redescription of Pseudotropheus livingstonii and Pseudotropheus elegans from Lake Malaŵi, Africa, pp. 169-178 in Zootaxa 4154 (2) on page 171, DOI: 10.11646/zootaxa.4154.2.4, http://zenodo.org/record/25517
Quasi-cyclic Generalized LDPC codes with low error floors
No full textIn this paper, a novel methodology for designing structured generalized LDPC (G-LDPC) codes is presented. The proposed design results in quasi-cyclic G-LDPC codes for which efficient encoding is feasible through shift-register-based circuits. The structure imposed on the bipartite graphs, together with the choice of simple component codes, leads to a class of codes suitable for fast iterative decoding. A pragmatic approach to the construction of G-LDPC codes is proposed. The approach is based on the substitution of check nodes in the protograph of a low-density parity-check code with stronger nodes based, for instance, on Hamming codes. Such a design approach, which we call LDPC code doping, leads to low-rate quasi-cyclic G-LDPC codes with excellent performance in both the error floor and waterfall regions on the additive white Gaussian noise channel
The Same Old New Normal
No full textJournal #14 from Media Rise's Quarantined Across Borders Collection by Ryan Arron D'Souza. From United Arab Emirates. Quarantined in United States, Florida.Media Rise Publications. Quarantined Across Borders Collection. Edited by Dr. Srividya "Srivi" Ramasubramanian.The author tries to make sense of the ideas and practices normalized during quarantine
A Bayesian hierarchical model for risk assessment of methylmercury
No full textThis article uses a Bayesian hierarchical model to quantify the adverse health effects associated with in-utero exposure to methylmercury. By allowing for study-to-study as well as outcome-to-outcome variability, the approach provides a useful meta-analytic tool for multi-outcome, multi-study environmental risk assessments. The analysis presented here expands on the findings of a National Academy of Sciences (NAS) committee, charged with advising the United States Environmental Protection Agency (EPA) on an appropriate approach to conducting a risk assessment for methylmercury. The NAS committee, for which the senior author (Ryan) was a committee member, reviewed the findings from several conflicting studies and reported the results from a Bayesian hierarchical model that synthesized information across several studies and for several outcomes. Although the NAS committee did not suggest that the hierarchical model be used as the actual basis for a methylmercury risk assessment, the results from the model were used to justify and support the final recommendation that the risk analysis be based on data from a study conducted in the Faroe Islands, which had found an association between in-utero exposure to methylmercury and impaired neurological development. We consider a variety of statistical issues, but particularly sensitivity to model specification. © 2003 American Statistical Association and the International Biometric Society
Novel multi-electrode probe with three dimensional spatial resolution for simultaneous recording/stimulation in long-term adaptive deep brain stimulaton
No full textWhen treating neurological disorders such as Parkinson’s Disease (PD) modern technologies experience many deficiencies and/or limitations that researchers have been working towards improving. The problems that occur with modern devices are inadequate mechanical robustness, glial scarring due to tissue damage, reduced target area localization, and inability to simultaneously record/stimulate in vivo post implantation. The research presented here resolves the issues stated above, delivering the design of a novel Multi-Electrode Probe with 3-D spatial resolution and an on-board preamplification/filtering chip capable of simultaneous recording/stimulation. The probe has been modeled in Wildfire Pro/Engineer 4.0 and Finite Element Analysis (FEA) was performed in COMSOL Multiphysics 3.4. The neural chip which consists of both analog and digital circuitry was designed with Taiwan Semiconductor’s (TSMC) 0.18µm CMOS technology. The very large scale integration (VLSI) design and simulation was performed in Cadence Schematic and Spectre, respectively. The aforementioned work was done in hopes of delivering a neural probe that can eventually be used in a closed loop system for Adaptive Deep Brain Stimulation treatment.Ph.D.Includes bibliographical referencesIncludes vitaby Ryan M. Elkhol
Corrigendum: Expression analysis of candidate genes regulating successional tooth formation in the human embryo
No full textA corrigendum on
Expression analysis of candidate genes regulating successional tooth formation in the human embryo
by Olley, R., Xavier, G. M., Seppala, M., Volponi, A. A., Geoghegan, F., Sharpe, P. T., et al. (2014). Front. Physiol. 5:445. doi: 10.3389/fphys.2014.00445
The author Ryan Olley should appear as Olley RC on the published article “Expression analysis of candidate genes regulating successional tooth formation in the human embryo.”
The original article was updated
Pseudotropheus livingstonii Boulenger 1899
No full textPseudotropheus livingstonii (Boulenger 1899) (Fig. 2) Tilapia livingstonii Boulenger 1899 Pseudotropheus williamsi (non-Günther).— Regan 1922 Pseudotropheus livingstonii, Trewavas 1935.— Konings 2007 Pseudotropheus elegans (non-Trewavas).— Ribbink et al. 1983 Metriaclima livingstonii.— Stauffer et al. 1997 Material examined. Pseudotropheus livingstonii BMNH 1863.11.12.22, holotype, 55.7 mm SL, Zambesi Expedition, Lake Malaŵi; PSU 4925, 19, 64.3–114.4 mm SL, Cape Maclear, 14º05’ S, 34º54’E, Lake Malaŵi. Diagnosis. Pseudotropheus livingstonii is distinguished from all other members currently in Pseudotropheus (Konings 2007), except P. crabro, P. demasoni, and P. saulosi, by the presence of five or fewer vertical bars below the dorsal fin. Most Pseudotropheus species either have no bars or have greater than five below the dorsal fin. Pseudotropheus livingstonii is distinguished from P. crabro, P. demasoni, and P. s au l os i by a pale yellow to hyaline dorsal fin vs. dorsal fin heavily pigmented with black. Description. Principal morphometric ratios and meristics for holotype and for specimens from population at Cape Maclear in Table 1. Medium-sized to large mbuna, ovoid body (mean BD 31.4% SL) with greatest depth between fourth to sixth dorsal spine. Dorsal body profile with gradual curve downward posteriorly, more pronounced towards caudal peduncle; ventral body profile almost straight between pelvic fins and base of anal fin with upward taper to caudal peduncle. Dorsal head profile rounded, with smooth curve between interorbital and dorsal-fin origin; horizontal eye diameter (mean 32.0% HL) greater than preorbital depth (mean 19.6% HL); eye (along horizontal axis) in center of head; snout straight to slightly concave in some individuals; isognathous jaws; tooth bands with 4–5 rows in upper jaw and 3–5 rows in lower; rows continuous through symphyses; teeth in anterior outer row bicuspid with posterior lateral teeth primarily unicuspid, teeth in inner rows tricuspid. ......continued on the next page Dorsal fin XVII–XIX (mode XVIII) and 9–10 (mode 9). Anal fin III and 8–9 (mode 8). First 4–5 dorsal-fin spines gradually longer posteriorly; fourth spine about 2 times length of first spine; last 13 spines slightly longer posteriorly; last spine longest, about 3 times length of first spine; rayed portion of dorsal fin with subacuminate (females) to pointed (males) tip, third or fourth ray longest, to approximately ¼ length of caudal fin in females and approximately ¾ length of caudal fin in males. Anal-fin spines progressively longer posteriorly; third or fourth anal-fin ray longest, ½ length caudal fin in both sexes; 0–3 small yellow spots on posterior part of anal fin in females and 0–6 yellow spots on posterior part of anal fin in males. Caudal fin subtruncate to slightly emarginate. Pelvic fin to first or second spine of anal fin. Pectoral fin moderately long and wing-shaped with upper pointed tip, length to vertical line through base of 12th or 14th dorsal-fin spine. Flank scales ctenoid with abrupt transition to small scales on breast; 32–35 lateral-line scales; cheek with 3–4 (mode 4) rows of small scales; caudal fin with tiny scales to ¼ length; no scales on other fins. Gill rakers on first ceratobranchial 9–12 (mode 11). Recently captured fish with dark brown head, white gular region with gray blotches; black spot on opercle with reflected blue highlights. Laterally brown with 4 dark brown bars from dorsal fin to belly. Caudal fin with yellow rays and clear membranes. Anal fin brown anteriorly to first or second ray, hyaline posteriorly; 0–6 yellow ocelli in rayed portion. Pectoral fins with yellow rays and clear membranes. Pelvic fins black anteriorly, hyaline posteriorly. Female coloration similar to male, not as vivid.Published as part of Stauffer Jr, J. R., Konings, F. & Ryan, T. M., 2016, Redescription of Pseudotropheus livingstonii and Pseudotropheus elegans from Lake Malaŵi, Africa, pp. 169-178 in Zootaxa 4154 (2) on pages 172-174, DOI: 10.11646/zootaxa.4154.2.4, http://zenodo.org/record/25517
Shifting and persosting in the face of failure: Learning from what did not work
No full textSocial justice activism demands coordinated, concentrated efforts to move the needle in a positive direction. In the author's nine years as a social justice educator, he led multiple large- and small-scale projects for social justice within higher education. In many ways, those efforts failed to create a lasting impact. In the higher education ecosystem, they also took away time from the kind of promotable work which would benefit his case for tenure and promotion. Trying - and failing - to effect institutional changes left him emotionally, psychologically, and physically exhausted. Beyond that, he suffered from feelings of loneliness, exclusion, and lack of direction. For a long time, the author blamed himself for the failure to change the institution to be a place in which he felt comfortable. He also failed to cope with these negative experiences and emotions, often seething in frustration or anger or avoiding similar situations of vulnerability or creativity. It took years for him to remember and internalize lessons of persistence and shifting appraisals in order to maintain motivation for action and survive the stressors of working within an oppressive system.Published versio
‘Powers of a squirrel, and also a girl’: Squirrel Girl and alternatives for women in superhero comic-books – an interview with Ryan North
No full textRyan North is a Canadian author who writes a host of comics, most notably Dinosaur Comics (www.
qwantz.com, 2003-present), Adventure Time (2012–2014, winner of both an Eisner and a Harvey Award),
The Midas Flesh (2013) and The Unbeatable Squirrel Girl (R. North and E. Henderson, 2015). North
is also the creator of To Be Or Not To Be (2013), a choose-your-own-adventure version of Hamlet funded
through Kickstarter, published as a book and also as a computer game. North has recently followed this with
Romeo And/Or Juliet (2016)
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