3,227 research outputs found
Occurrence of a Gynandromorphic Bombus bimaculatus (Hymenoptera: Apidae) in Southeastern Ohio
Herein, we introduce the first reported case of gynandromorphy in the bumblebee Bombus bimaculatus (Cresson) (Hymenoptera: Apidae), a relatively common North American species found east of the Mississippi River. The specimen was collected in Marietta, Ohio as part of a bee diversity assessment project for Washington County. Gynanders exhibit discrete male and female characters in a single individual. We discuss the potential causes of gynandromorphy exhibited by this specimen, which has differing antennal segments (12 and 13), facial maculation, abdominal hair coloration, and the presence of a corbicula â secondary sex characters that are characteristic for the genus Bombus
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Enhanced Capabilities of the Spike Algorithm and a New Spike-OpenMP Solver
SPIKE is a parallel algorithm to solve block tridiagonal matrices. In this work, two useful improvements to the algorithm are proposed. A flexible threading strategy is developed, to overcome limitations of the recursive reduced system method. Allo- cating multiple threads to some tasks created by the SPIKE algorithm removes the previous restriction that recursive SPIKE may only use a number of threads equal to a power of two. Additionally, a method of solving transpose problems is shown. This method matches the performance of the non-transpose solve while reusing the original factorization
Using Peptidomimetics and Constrained Peptides as Valuable Tools for Inhibiting Proteinâ»Protein Interactions.
Proteinâ»protein interactions (PPIs) are tremendously important for the function of many biological processes. However, because of the structure of many proteinâ»protein interfaces (flat, featureless and relatively large), they have largely been overlooked as potential drug targets. In this review, we highlight the current tools used to study the molecular recognition of PPIs through the use of different peptidomimetics, from small molecules and scaffolds to peptides. Then, we focus on constrained peptides, and in particular, ways to constrain α-helices through stapling using both one- and two-component techniques
Towards robust experimental design for user studies in security and privacy
Background: Human beings are an integral part of computer
security, whether we actively participate or simply
build the systems. Despite this importance, understanding
users and their interaction with security is a blind spot
for most security practitioners and designers. / Aim: Define principles for conducting experiments into
usable security and privacy, to improve study robustness
and usefulness. / Data: The authorsâ experiences conducting several research
projects complemented with a literature survey.
Method: We extract principles based on relevance to the
advancement of the state of the art. We then justify our
choices by providing published experiments as cases of
where the principles are and are not followed in practice
to demonstrate the impact. Each principle is a discipline specific
instantiation of desirable experiment-design elements
as previously established in the domain of philosophy
of science. / Results: Five high-priority principles â (i) give participants
a primary task; (ii) incorporate realistic risk;
(iii) avoid priming the participants; (iv) perform doubleblind
experiments whenever possible and (v) think carefully
about how meaning is assigned to the terms threat
model, security, privacy, and usability. / Conclusion: The principles do not replace researcher
acumen or experience, however they can provide a valuable
service for facilitating evaluation, guiding younger
researchers and students, and marking a baseline common
language for discussing further improvements
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Ave, Colonia Veraniega, Sol / Bird, Camp, Sun
Collaborative Quintain style poem
Investigations on the slope efficiency of a pulsed 2.8-”m Er3+:LiYF4 laser
A slope efficiency of 40% from an Er3+:LiYF4 laser is demonstrated under pulsed Ti:sapphire pumping at 973 nm. With reduction of the pump-pulse duration a significant decrease of the slope efficiency and an increase of the threshold is observed in the experiment and confirmed with high accuracy in a computer simulation. This behavior is due to interionic upconversion from the lower laser level, which leads to energy recycling into the upper laser level. The upconversion rate is negative at threshold but increases strongly with rising pump pulse energy, thus enhancing the slope efficiency. The conditions are derived that are necessary for achieving the high slope efficiency of the energy-recycling regime
Value of middle school athletics as perceived by middle school administrators, faculty, and ninth and tenth-grade student-athletes in Tulsa public schools
Culture and trade through the prism of technical art history: a study of Chinese export paintings
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