Computing a Minimum-Dilation Spanning Tree is NP-hard

In a geometric network G = (S, E), the graph distance between two vertices u, v in S is the length of the shortest path in G connecting u to v. The dilation of G is the maximum factor by which the graph distance of a pair of vertices differs from their Euclidean distance. We show that given a set S of n points with integer coordinates in the plane and a rational dilation delta > 1, it is NP-hard to determine whether a spanning tree of S with dilation at most delta exists

A complete checklist with new records and geographical distribution of the rove beetles (Coleoptera, Staphylinidae) of Brazil

This paper presents the first comprehensive list of 2,688 species of Staphylinidae (Coleoptera) recorded from Brazil. The list is based on the taxonomic and ecological literature, and new records from some insect collections, and includes locality references for each species. In addition, Brazilian localities and the country-level distribution outside of Brazil are provided for each species. Brazilian localities are organized by state, and include the bibliographic reference and page number where each locality was reported. All localities are geo-referenced, organized by state, and listed in an Appendix.Este trabalho apresenta a primeira lista completa das 2.688 espécies de Staphylinidae (Coleoptera) registradas para o Brasil. A lista inclui todas as localidades citadas para cada espécie e baseia-se na literatura taxonômica e ecológica disponíveis. Cada localidade inclui a referência bibliográfica e o número da página onde foram citadas. Também são apresentados registros inéditos obtidos de algumas coleções de insetos. Além das localidades brasileiras são citados todos os países com ocorrência conhecida para cada espécie. As localidades brasileiras, listadas no Apêndice, estão organizadas por estado e georreferenciadas

The pool boiling curve in microgravity

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76562/1/AIAA-1996-499-522.pd

Исследование этапов жизненного цикла конкурентного преимущества машиностроительного предприятия

В статье рассмотрены вопросы создание научно-обоснованого механизма формирования и оценки конкурентных преимуществ машиностроительного предприятия. Важной задачей статьи является разработка предложений по формированию жизненного цикла конкурентного преимущества, обоснование его этапов и их экономического содержания, прогнозирование изменения силы конкурентного преимущества по этапам его жизненного цикла.In the article questions are considered creation of the scientific-grounded mechanism of forming and estimation of competitive edges of machine-building enterprise. The important task of the article is development of suggestions on forming of life cycle of competitive edge, ground of his stages and their economic maintenance, prognostication of change of force of competitive edge on the stages of his life cycle

A route to sub-diffraction-limited CARS Microscopy

We theoretically investigate a scheme to obtain sub-diffraction-limited resolution in coherent anti-Stokes Raman scattering (CARS) microscopy. We find using density matrix calculations that the rise of vibrational (Raman) coherence can be strongly suppressed, and thereby the emission of CARS signals can be significantly reduced, when pre-populating the corresponding vibrational state through an incoherent process. The effectiveness of pre-populating the vibrational state of interest is investigated by considering the excitation of a neighbouring vibrational (control) state through an intense, mid-infrared control laser. We observe that, similar to the processes employed in stimulated emission depletion microscopy, the CARS signal exhibits saturation behaviour if the transition rate between the vibrational and the control state is large. Our approach opens up the possibility of achieving chemically selectivity sub-diffraction-limited spatially resolved imaging

A Rapid and Efficient Method for Purifying High Quality Total RNA from Peaches (Prunus persica) for Functional Genomics Analyses

http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000100010&lng=es&nrm=isoPrunus persica has been proposed as a genomic model for deciduous trees and the Rosaceae family. Optimized protocols for RNA isolation are necessary to further advance studies in this model species such that functional genomics analyses may be performed. Here we present an optimized protocol to rapidly and efficiently purify high quality total RNA from peach fruits (Prunus persica). Isolating high-quality RNA from fruit tissue is often difficult due to large quantities of polysaccharides and polyphenolic compounds that accumulate in this tissue and co-purify with the RNA. Here we demonstrate that a modified version of the method used to isolate RNA from pine trees and the woody plant Cinnamomun tenuipilum is ideal for isolating high quality RNA from the fruits of Prunus persica. This RNA may be used for many functional genomic based experiments such as RT-PCR and the construction of large-insert cDNA libraries

The Clinical Utility of a Precision Medicine Blood Test Incorporating Age, Sex, and Gene Expression for Evaluating Women with Stable Symptoms Suggestive of Obstructive Coronary Artery Disease: Analysis from the PRESET Registry.

Background: Evaluating women with symptoms suggestive of coronary artery disease (CAD) remains challenging. A blood-based precision medicine test yielding an age/sex/gene expression score (ASGES) has shown clinical validity in the diagnosis of obstructive CAD. We assessed the effect of the ASGES on the management of women with suspected obstructive CAD in a community-based registry. Materials and Methods: The prospective PRESET (A Registry to Evaluate Patterns of Care Associated with the Use of Corus® CAD in Real World Clinical Care Settings) Registry (NCT01677156) enrolled 566 patients presenting with symptoms suggestive of stable obstructive CAD from 21 United States primary care practices from 2012 to 2014. Demographics, clinical characteristics, and referrals to cardiology or further functional and/or anatomical cardiac studies after ASGES testing were collected for this subgroup analysis of women from the PRESET Registry. Patients were followed for 1-year post-ASGES testing. Results: This study cohort included 288 women with a median age 57 years. The median body mass index was 29.2, with hyperlipidemia and hypertension present in 48% and 43% of patients, respectively. Median ASGES was 8.5 (range 1-40), with 218 (76%) patients having low (≤15) ASGES. Clinicians referred 9% (20/218) low ASGES versus 44% (31/70) elevated ASGES women for further cardiac evaluation (odds ratio 0.14, p < 0.0001, adjusted for patient demographics and clinical covariates). Across the score range, higher ASGES were associated with a higher likelihood of posttest cardiac referral. At 1-year follow-up, low ASGES women experienced fewer major adverse cardiac events than elevated ASGES women (1.3% vs. 4.2% respectively, p = 0.16). Conclusions: Incorporation of ASGES into the diagnostic workup demonstrated clinical utility by helping clinicians identify women less likely to benefit from further cardiac evaluation

Direct Mechanism of Reaction CH3 ++CH4→C2H5 ++H2

This is the publisher's version, also available electronically from http://scitation.aip.org/content/aip/journal/jcp/51/1/10.1063/1.167175

Phase Space Tomography of Matter-Wave Diffraction in the Talbot Regime

We report on the theoretical investigation of Wigner distribution function (WDF) reconstruction of the motional quantum state of large molecules in de Broglie interference. De Broglie interference of fullerenes and as the like already proves the wavelike behaviour of these heavy particles, while we aim to extract more quantitative information about the superposition quantum state in motion. We simulate the reconstruction of the WDF numerically based on an analytic probability distribution and investigate its properties by variation of parameters, which are relevant for the experiment. Even though the WDF described in the near-field experiment cannot be reconstructed completely, we observe negativity even in the partially reconstructed WDF. We further consider incoherent factors to simulate the experimental situation such as a finite number of slits, collimation, and particle-slit van der Waals interaction. From this we find experimental conditions to reconstruct the WDF from Talbot interference fringes in molecule Talbot-Lau interferometry.Comment: 16 pages, 9 figures, accepted at New Journal of Physic

Revision of Oedichirus.

137 p. : ill. (some col.), maps ; 26 cm.The New World species of Oedichirus Erichson, 1839, are revised, redescribed, or newly described, illustrated, and included in keys for identification. The morphology of the ventral pterothoracic sclerites is examined and Matsuda's (1970) interpretation is largely adopted over that of Ferris (1940b). Newly discovered characters of the median gonocoxal plate and associated vulvar plate, including its microstructures, are discussed. Prior to the present paper New World species were known in Brazil and Costa Rica, but are herein newly reported for the Dominican Republic, Mexico, Ecuador, Peru, Bolivia, and Argentina; a specimen intercepted at a port in the United States was said to have come from Nicaragua. Eight species were previously described; 19 new ones are added herein, 12 from Brazil (O. apiculus, O. batillus, O. bicristatus, O. bullaglaber, O. bullahirtus, O. clavolateralis, O. clavulus, O. echinatus, O. exilis, O. glabrihamus, O. lunatus, and O. procerus), two from Mexico (O. isthmus and O. sinuosus), and one each from Argentina (O. misionesiensis), Bolivia (O. dilophus), Ecuador (O. distortus), Peru (O. hamatus), and Dominican Republic (O. dominicanensis). A neotype is designated for O. geniculatus and lectotypes are designated for O. brunneus Wendeler, O. pictipes Bierig, O. ohausi Wendeler, O. optatus Sharp, O. sparsipennis Bernhauer, and O. speculifrons Bernhauer. Some species are included in species groups