A preliminary annotated checklist and evaluation of the diversity of the Chrysomelidae (Coleoptera) of the Baja California peninsula, Mexico

A preliminary annotated checklist of the Chrysomelidae of the Baja California peninsula, Mexico is presented based on literature records and the examination of approximately 16,000 chrysomelid specimens. Seven subfamilies and 218 described species have been identified. Ninty-one species are recognized from the Baja California peninsula for the first time. Twenty-nine species are listed as endemic. An additional 128 morphospecies have been identified as undescribed or not yet associated with described species of mainland Mexico or the United States. Adult host plant associations have been identified for approximately 120 species or 35% of the leaf beetle fauna of the region. Each of the 218 described species is associated with the eight plant communities as outlined by Wiggins (1980). Two dominant subfamilies comprise 76% of the leaf beetle fauna: Galerucinae, 87 species (40%) and Cryptocephalinae, 78 species (36%). The following new combinations are proposed: Neolema californica (Heinze, 1927), transferred from Lema Fabricius, 1798; Pseudoluperus histrio (Horn, 1895), transferred from Keitheatus Wilcox, 1965, and Diachus peninsularis (Schaeffer, 1906), transferred from Triachus J. L. LeConte, 1880. Lema peninsulae Crotch, 1873, is removed from synonymy with L. balteata J. L. LeConte, 1884 and reinstated as a valid species. A replacement name is proposed: Longitarsus bajaensis Andrews and Gilbert for Longitarsus bicolor Horn, 1894

An investigation into the use of group VI elements as dopants in III-V materials prepared by molecular beam epitaxy

An electrochemical cell Pt/Ag/AgI/Ag2X/Pt (X=S,Se) has been used as a highly controllable source of S2 or Se2 molecules for n-type doping of GaAs and Ga1As grown by Molecular Beam Epitaxy (MBE). This source produces a pure oeam ot chalcogen dimers at low temperature (200-300°C) and is simply programmed by an applied emf. The response time of the cell is of the order of one second enabling complicated doping profiles to be achieved

Ethnocultural Differences in Motivations for Sex

Motivations for sex are numerous and varied (Browning, 2004; Meston & Buss, 2007). Using exploratory factor analytic methods, 21 theoretically distinct motivations have been proposed (Browning, 2004; Meston & Buss, 2007). A comprehensive number of motivations for sex has yet to be examined with confirmatory techniques. Theoretical work related to the treatment of sexual dysfunction has suggested that motivations focused on individual and partner pleasure would positively relate to sexual functioning (e.g., Leiblum & Rosen, 1992). Motivations for sex also appear to vary as a function of ethnocultural factors, as some motivations have only been uncovered utilizing qualitative methods with diverse samples (Browning, 2004) and some ethnic groups appear to differ in the average degree to which they endorse specific motivations (Browning; 2004; Cooper et al., 1998). The current study expanded on previous literature by examining four distinct aims: (1) to confirm a comprehensive number of motivations for sex, (2) to examine ethnic differences in motivations for sex among the four largest ethnic groups in the U.S., (3) to explore clinical correlates of motivations for sex, and (4) to examine ethnic differences in the relations between motivations for sex and clinical correlates. Confirmatory factor analyses largely supported 21 distinct motivations for sex [chi-square (3,794) = 11,208.27, p \u3c.001, CFI = .87, SRMR = .052, RMSEA = .046, 90% CI = .045-.047, chi-square/df = 2.95]. Most factors (14) appeared invariant across ethnic groups. Two motivations (Role Fulfillment and Submission) varied in the average degree to which ethnic groups endorsed each motivation. Motivations emphasizing pleasure and partner pleasure positively correlated with sexual functioning. Six motivations varied across ethnic groups in their relations with clinical correlates. Overall, the study supports a comprehensive set of motivations for sex. Further, on average, ethnic groups appear to engage in sex for mostly similar reasons. Correlations between motivations for sex and clinical correlates largely support proposed mechanisms of sexual dysfunction treatment. These relations, however, appear to vary among ethnic groups, potentially suggesting the importance of relationship context in how motivations for sex relate to clinically-relevant variables

Gaussian Time-Dependent Variational Principle for Bosons I - Uniform Case

We investigate the Dirac time-dependent variational method for a system of non-ideal Bosons interacting through an arbitrary two body potential. The method produces a set of non-linear time dependent equations for the variational parameters. In particular we have considered small oscillations about equilibrium. We obtain generalized RPA equations that can be understood as interacting quasi-bosons, usually mentioned in the literature as having a gap. The result of this interaction provides us with scattering properties of these quasi-bosons including possible bound-states, which can include zero modes. In fact the zero mode bound state can be interpreted as a new quasi-boson with a gapless dispersion relation. Utilizing these results we discuss a straightforward scheme for introducing temperature.Comment: 28 pages, 1 figure to appear in Annals of Physic

Exploring the phase space of medium induced QCD radiation with jets in ALICE at the LHC

Jets are back to back cascades of particles produced in the hard scattering of quarks and gluons. The pattern of cascade as these recoiling partons separate is governed by the properties of Quatum Chromo-Dynamics (QCD), the field theory for the strong nuclear force that binds together the quarks and gluons that make up the atomic nucleus. Studying jets from their production to their fragmentation gives insight into various unanswered aspects of QCD. Additionally, studying their modification in the presence of a strongly interacting deconfined medium of quarks and gluons produced in heavy-ion collisions, known as the Quark-Gluon Plasma (QGP), can help us to understand the properties of the strong nuclear force under the most extreme conditions akin to those believed to exist at the earliest stages of the universe or in the core of neutron stars. In this thesis, novel approaches to studying jet substructure are presented. Measurements were performed using the ALICE detector at the CERN LHC on pp collisions with a centre-of-mass energy of $\sqrt{s}$ = 7 TeV and Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. The results from Pb-Pb collisions are compared to those from pp collisions where significant differences in the momentum fraction between two subjects identified via grooming methods was observed. Additionally, new measurement are performed on the number of splittings identified in jets using iterative declustering techniques

Anxiety and Depression During Childhood and Adolescence: Testing Theoretical Models of Continuity and Discontinuity

The present study sought to clarify the trajectory (i.e., continuous vs. discontinuous) and expression (i.e., homotypic vs. heterotypic) of anxiety and depressive symptoms across childhood and adolescence. We utilized a state-of-the-science analytic approach to simultaneously test theoretical models that describe the development of internalizing symptoms in youth. In a sample of 636 children (53% female; M age = 7.04; SD age = 0.35) self-report measures of anxiety and depression were completed annually by youth through their freshman year of high school. For both anxiety and depression, a piecewise growth curve model provided the best fit for the data, with symptoms decreasing until age 12 (the “developmental knot”) and then increasing into early adolescence. The trajectory of anxiety symptoms was best described by a discontinuous homotypic pattern in which childhood anxiety predicted adolescent anxiety. For depression, two distinct pathways were discovered: A discontinuous homotypic pathway in which childhood depression predicted adolescent depression and a discontinuous heterotypic pathway in which childhood anxiety predicted adolescent depression. Analytical, methodological, and clinical implications of these findings are discussed

Investigating the Potential Double-Edged Score of Immigration-Related Stress, Discrimination, and Mental Health Access

Prior work has suggested that discrimination and immigration-related stress may impede mental health care seeking and utilization among Latinx populations. These effects may be more nuanced as both discrimination and immigration-related stress may increase symptomology, particularly post-traumatic stress disorder (PTSD) and depression. Both symptoms may, in turn, prompt attempts to seek care. The current study examined the direct effects of discrimination and immigration-related stress on care access, as well as potentially indirect effects with PTSD and depression symptoms as mediators. Interviews and online surveys were completed with 234 Latinx residents of the Midwest, assessing everyday discrimination, discrimination in healthcare, PTSD symptoms, depression symptoms, current mental health utilization, and previous unsuccessful attempts to seek care. Direct effects of discrimination and immigration-related stress were largely unrelated to care access variables. Discrimination in healthcare settings predicted both unsuccessful attempts to seek care and current use, but this effect was positive. The indirect effect was largely supported, but only for PTSD symptoms and not depression. Results indicate that further investigation is necessary to understand the direct effects of discrimination on care access. Further, discrimination and immigration-related stress may indirectly prompt attempts to seek mental health care

Book reviews

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/48161/1/267_2005_Article_BF01866106.pd