New Aspects of Thromboangiitis obliterans (von Winiwarter-Buerger's Disease)

The existence of thromboangiitis obliterans as a clinical entity has been a matter of debate for many years. In contrast to other immunovasculitides there is no organ involvement while peripheral vessels are affected. Heavy smokers under 40 years of age have a high predisposition for the disease. The cerebral form shows relapsing brain infarctions which can be visualized in CCT while panarteriography remains negative. Apart from unspecific inflammatory signs in blood and CSF there are distinctive laboratory findings proving the autoimmunological character of von Winiwarter-Buerger's disease. In the serum anti-elastin antibodies, IgE and anticollagen antibody activity are detectable. In 3 patients the authors detected specific immunohistochemical findings in a biopsy specimen of the temporal artery. In addition to platelet-inhibiting substances corticoids in acute and azathioprine in chronic treatment becomes necessary

Seasonal changes in odour preferences by male euglossine bees (Hymenoptera: Apidae) and their ecological implications

Orchid bees are an important group of specialized insect pollinators in the Neotropics. Male orchid bees are attracted by a wide range of aromatic substances often produced by flowers. Previous studies found that in some species the males change their aromatic preferences between seasons. In our study we documented seasonal changes of aromatic preferences in five euglossine bee assemblages along a 380-km-long seasonality and precipitation gradient and related them to climatic factors. We found that the proportion of species per site showing changes in their aromatic preference between seasons increased with climatic seasonality towards the south. Those species mainly belong to the genus Euglossa, subgenus Euglossa. We conclude that climatic seasonality mainly affects the orchid bees via the turnover of the aromatic substances provided by the plants. Further, we suggest that the ability to change the aromatic preference between seasons could be interpreted as a phylogenetic pre-adaptation that enabled some species to colonize climatically strongly seasonal habitat

How to Think (Like a Lawyer) About Rape

From the American Law Institute to college campuses, there is a renewed interest in the law of rape. Law school faculty, however, may be reluctant to teach this deeply debated topic. This article begins from the premise that controversial and contested questions can be best resolved when participants understand the conceptual architecture that surrounds and delineates the normative questions. This allows participants to talk to one another instead of past each other. Accordingly, in this article, we begin by diffusing two non-debates: the apparent conflict created when we use “consent” to mean two different things and the question of whether rape law ought to be formulated in terms of consent or force. From here, we turn to the conceptual apparatuses that surround the normative questions of freedom from force, knowledge, and capacity. Here, we suggest how better understanding these concepts can frame the underlying discussions as to what sorts of coercion undermine consent, what kinds of deception invalidate consent, and when the victim is too incapacitated to consent. Finally, we turn to different formulations of consent, demonstrating that one conception better captures the harm of rape but that other formulations may better protect victims. We show how clarifying these questions allows discussants to see why different formulations are valuable and to debate the best all-things-considered formulation. Although this article is framed as a question of how (to teach students) to think like lawyers about rape, its ambition is to set forth a framework that is useful to reformers as well

Pulp and Papermaking Properties of Gypsy Moth-Killed Trees

A study was undertaken to evaluate the pulp and papermaking properties of gypsy moth-killed trees. Red oak (Quercus rubra), white oak (Quercus alba), and red maple (Acer rubrum) trees dead 1, 2, 3, 4, and 5 years were harvested, chipped, kraft pulped, and compared to pulped live control trees. No statistical differences (P < 0.05) in total kraft pulp yields were measured with time after tree death for the species evaluated. Handsheet strength evaluations were conducted using these pulps and they were compared at four CSf levels. With but a few exceptions, no statistical differences (P < 0.05) in handsheet tear and tensile properties were measured; however, wide variations in MIT fold and burst properties were observed. The differences observed in sheet properties over the freeness levels tested could not be related to wood degradation that may have occurred with time after tree death.Evaluation of the top, middle, and bottom sections of pulped red and white oak trees dead five years was conducted and no statistical differences in total pulp yields were measured. Significant differences in pulp yields due to advanced wood decay were measured in red maple; however in most cases no differences in handsheet strength properties were measured for all species within the freeness range tested.On the basis of the results observed in this study, it was concluded that neither the total pulp yields nor the papermaking properties would be drastically affected by the introduction of gypsy moth-killed trees into the kraft pulping process

Diversity and community composition of euglossine bee assemblages (Hymenoptera: Apidae) in western Amazonia

Tropical forests are known for their diverse insect fauna. We aimed to determine the effect and relative importance of latitude, elevation and climatic factors affecting species richness and turnover in euglossine bee assemblages along a gradient of 18°latitude from tropical rainforests to subtropical, deciduous dry forests in Peru and Bolivia. Sixteen forest sites were sampled during the dry season. Variance partitioning techniques were applied to assess the relative effects of the spatial and environmental variables on species richness and composition. Furthermore, we conducted a Species Indicator Analysis to find characteristic species for the biogeographic zones. There was a significant decrease in species richness towards the subtropical area. The best predictors of species richness were precipitation and its consequences on soil properties as well as temperature seasonality. The abundance of euglossines was most closely related to precipitation and soil-pH, but the causal links of abundance to these factors is unclear since soil-pH itself is correlated to a drastic turnover of vegetation structure. Based on the analysis of assemblage composition we propose three different assemblages with a transitional zone at the southern tropical area. The biogeographical distribution of euglossine bees along our study transect appears to be primarily related to climatic conditions and does not reflect the common subdividion of Amazonia into drainage system

Using Works of Visual Art to Teach Matrix Transformations

The authors present a modern technique for teaching matrix transformations on $\R^2$ that incorporates works of visual art and computer programming. Two of the authors were undergraduate students in Dr. Hamburger\u27s linear algebra class, where this technique was implemented as a special project for the students. The two students generated the images seen in this paper, and the movies that can be found on the accompanying webpage www.wku.edu/\~{\space}bruce.kessler/

Nitrogen deficiency in Arabidopsis affects galactolipid composition and gene expression and results in accumulation of fatty acid phytyl esters

Nitrogen is an essential nutrient for plants because it represents a major constituent of numerous cellular compounds, including proteins, amino acids, nucleic acids and lipids. While N deprivation is known to have severe consequences for primary carbon metabolism, the effect on chloroplast lipid metabolism has not been analysed in higher plants. Nitrogen limitation in Arabidopsis led to a decrease in the chloroplast galactolipid monogalactosyldiacylglycerol (MGDG) and a concomitant increase in digalactosyldiacylglycerol (DGDG), which correlated with an elevated expression of the DGDG synthase genes DGD1 and DGD2. The amounts of triacylglycerol and free fatty acids increased during N deprivation. Furthermore, phytyl esters accumulated containing medium-chain fatty acids (12:0, 14:0) and a large amount of hexadecatrienoic acid (16:3). Fatty acid phytyl esters were localized to chloroplasts, in particular to thylakoids and plastoglobules. Different polyunsaturated acyl groups were found in phytyl esters accumulating in Arabidopsis lipid mutants and in other plants, including 16:3 and 18:3 species. Therefore N deficiency in higher plants results in a co-ordinated breakdown of galactolipids and chlorophyll with deposition of specific fatty acid phytyl esters in thylakoids and plastoglobules of chloroplasts