Reddening and extinction towards H II regions

The light emitted by the gas in H II regions is attenuated by dust. This extinction can be measured by comparing H alpha, H beta, and radio continuum fluxes, since the intrinsic ratios of the Balmer line and thermal radio continuum emissivities are nearly constant for reasonable conditions in H II regions. In the case of giant extragalactic H II regions, the extinction was found to be considerably greater than expected. The dust between the Earth and the emitting gas may have an optical thickness which varies. The dust may be close enough to the source that scattered light contributes to the flux, or the dust may be actually mixed with the emitting gas. It is difficult to decide which configuration is correct. A rediscussion of this question in light of recent observations, with the Fabry-Perot spectrophotometers, of the large Galactic H II region is presented. The color excesses are compared for stars embedded in these H II regions with those derived (assuming the standard law) from the nebular extinction and reddening

Infrared emission and excitation in LMC HII regions

The infrared excess (IRE) of the Large Magellanic Cloud (LMC) HII nebulae is found to correlate positively with the temperature of the ambient radiation field or with the He(+)/H(+) abundance ratio. This result is discussed in terms of a selective absorption of the photons in the range 504 to 912 A relative to the He ionizing photons. This interpretation may explain the paradox of finding highly excited nebulae with only relatively moderate equivalent width of their Balmer lines

Coecobrya kennethi n. sp. (Collembola, Entomobryomorpha) and presence of Arrhopalites caecus (Tullberg, 1871) from Ana Roiho cave (Maunga Hiva Hiva), Rapa Nui-Easter Island.

Anew species of Coecobrya Yosii, 1956 (Collembola, Entomobryomorpha, Entomobryidae) from a cave in Rapa Nui (Easter Island) is described. The new species can be distinguished from other species of the genus by the following characters: antenna relatively short, less than 4 times the cephalic diagonal; absence of smooth setae on ventral side of tibiotarsus; inner tooth of unguis at more than 1/3 of distance to basal ventral edge; unguiculus outer tooth smaller than the rest of unguiculus; absence of macrochaetae in group 6 on thoracic tergite II; four macrochaetae on central dorsal abdomen IV; smooth setae on manubrium posterior side; and 1+1 smooth setae on posterior face of ventral tube. The species A. caecus is frequently referred in the North hemisphere, and referred too in Australia and New Zealand, but this is the first record to Easter Island. The discovery of this two species resulted from the speleological work that was carried out in the cave Roiho, in the national park of Easter Island, Chile

Fauna Colembológica do Estado do Rio de Janeiro, Brasil

A list of 129 springtail species recorded in the Rio de Janeiro State, among with its localities and environments, is presented. The elaboration of this list, based on the examination of the Museu Nacional/UFRJ Collembola Collection and the revision of the specialized bibliography, it is part of a larger project that aim the inventory from the Rio de Janeiro Atlantic Rainforest insects.É apresentada uma lista de 129 espécies de colêmbolos registradas no Estado do Rio de Janeiro, juntamente com suas localidades e ambientes de coleta. A elaboração dessa lista, baseada no exame da Coleção de Collembola do Museu Nacional/UFRJ e na pesquisa de bibliografia especializada, constitui parte de um projeto mais abrangente que visa o inventário das espécies de insetos ocorrentes na Mata Atlântica fluminense

La différenciation des caryotypes polytènes dans le genre Bilobella (Collembola Neanurinae)

International audienc

Analisis Strategis Sistem Pengelolaan Repong Damar di Pesisir Krui, Lampung (Strategy Analysis on Management System of Repong Damar at Pesisir Krui, Lampung)

Main objective of this research was to identify dominant factors, which determined management system of Repong Damar (SPRD). SPRD was strategically complex and dynamic. Through system approach with SWOT analysis, AHP and Liker Scale, this research identified its dominant factors. Dominant factors, which determined SPRD goals, are land suitability, ecosystem functions, biodiversity, household economy insurance, trading practice and investment inputs. Furthermore, SPRD sustainability was supported by inheritance institution, indigenous knowledge’s, and ownership, which constitute social status symbol. Development strategy of SPRD was determined by community organizations strength and self-resilience, availability of road infrastructure, and law enforcement on farmers rights

Isotomiella nummulifer Deharveng & Oliveira 1990

Isotomiella nummulifer Deharveng & Oliveira, 1990 Localities. MEXICO: Campeche, Holpechén, Actún-Kin, litter and soil, 15.x. 1996, A. Ruiz lgt. (1 ex.); Campeche, Xtacumbilxunaan, soil and seeds, 29.xii. 1996, A. Ruiz lgt. (1 ex.); ibid. guano, 27.5. 1997, J. Palacios lgt. (1 ex.); Quintana Roo, Akumal, Actún Chen I, soil, 23.vii. 1997, J. Palacios lgt. (2 ex.); ibid. Actún Chen II, roots, 24.v. 1997, J. Palacios lgt. (1 ex.); Tamaulipas, Gómez Farías, Rancho El Cielo, 1.120m alt., litter, 8.v. 1985, J. Palacios & J. Najt (1 ex.); Veracruz, Cascadas del Xico, soil, 21.vii. 1977, J. Palacios lgt. (1 ex.).Published as part of Kováč, Ľubomír & Palacios-Vargas, José G., 2008, Redescription of Isotomiella alulu and I. delamarei (Collembola: Isotomidae) with notes on the systematics of the genus and new records from the Neotropics, pp. 1-17 in Zootaxa 1825 on page 9, DOI: 10.5281/zenodo.18308