2,625 research outputs found
The Set of Idempotents in the Weakly Almost Periodic Compactification of the Integers is not Closed
No full textThis paper answers negatively the question of whether the sets
of idempotents in the weakly almost periodic compacti?cations of (N; +) and
(Z; +) are closed
The Poudre River: history of collaboration over conflict
No full textPresented at the Fall 2014 Center for Collaborative Conservation (https://collaborativeconservation.org/) Seminar and Discussion Series, "Perspectives on the Poudre: Working River/Healthy River", September 9, 2014, Colorado State University, Fort Collins, Colorado. This fall semester's bi-weekly Seminar and Discussion Series focuses on the Poudre River and its watershed, its ecological needs, and how it is used to supply water for agriculture and urban needs. Presenters will highlight their topics and engage participants in dialogue. The series will culminate in a "world café" - campus and community open dialogue about the Poudre.Tom Cech was born and raised on a farm near Clarkson, Nebraska, graduated from Kearney State College with a Bachelor of Science Degree in Math Education, and later received a Masters Degree in Community and Regional Planning from the University of Nebraska – Lincoln. He was Executive Director of the Central Colorado Water Conservancy District in Greeley, taught water undergraduate and graduate level water resources courses at the University of Northern Colorado and Colorado State University, and is now the Director of the One World One Water (OWOW) Center for Urban Water Education and Stewardship at Metropolitan State University of Denver. Tom wrote "Principles of Water Resources: History, Development, Management and Policy," published by John Wiley & Sons - currently in its 3rd edition. Tom also recently published "Introduction to Water Resources and Environmental Issues," (co-author Dr. Karrie Pennington) with Cambridge University Press, and "Colorado Water Law for Non-Lawyers," (co-author P. Andrew Jones) with the University Press of Colorado. He has also completed histories of the Colorado Water Conservation Board and the Colorado State Engineer's Office with Bill McDonald and Dick Stenzel, respectively.Poster presentation.The meeting was held on a hot, dry summer day in 1874. Two groups of irrigators, from the downstream Union Colony (Greeley) and the new agricultural community in upstream Fort Collins - came armed with guns. The neutral Eaton Schoolhouse was too small to hold everyone, so people crammed the doorway. Most were Civil War veterans, and they all had a problem. "How would the two feuding groups divide the trickle of Cache la Poudre River water the remainder of the irrigation season - would it be based on "greatest need" or by priority (who dug their ditch first)?" The Union Colony delegates didn't like the greatest need idea, and they "hurled defiance in hot and unseemly language." The debate escalated with the Union Colony irrigators threatening to dig new irrigation ditches upstream of Fort Collins to choke off their water supply. The Fort Collins contingent objected to their uncooperative reaction. Then the meeting got ugly. One man, unable to bear the tension any longer, stood up and yelled, "Every man to his tent! To your rifle and cartridges!" It was a flashpoint in Colorado's water history. Were irrigators shot at this meeting? Who tried to calm the crowd and come up with a workable compromise for water management on the Cache la Poudre River? Tom Cech will explain this and more
Asymetria wybranych cech bilateralnych szkieletu głowy osobników szynszyli małej z miotów pojedynczych i mnogich
No full textPostanowiono zbadać, czy liczba osobników w miocie wpływa na wartości
wskaźników asymetrii cech metrycznych szkieletu głowy szynszyli małej? Materiałem do badań
były czaszki i żuchwy szynszyli, na których oszacowano wartości 13 bilateralnych cech
metrycznych. Określono współczynniki asymetrii względnej (Aw) i asymetrii fluktuacyjnej (FA).
Wśród 6 cech przyległych do osi czaszki współczynnik FA był istotny (P ≤ 0.01 i P ≤ 0.05)
w przypadku 2 cech, a wśród 7 cech odległych od osi czaszki – aż w przypadku 5. Stwierdzono
wzrost wartości istotnych statystycznie współczynników FA cech bilateralnych wraz z rosnącą
liczbą osobników w miocie.This study aimed at answering the question whether the number of animals per litter
affects the values of asymmetry indices of skull metric traits in long-tailed chinchilla. The
research material was chinchilla crania and mandibles, on which the values of 13 bilateral
metric traits were estimated. Relative asymmetry (Aw) and fluctuating asymmetry (FA) factors
were determined. Out of 6 traits being adjacent to the skull axis, the FA factor was significant
(P ≤ 0.01 and P ≤ 0.05) for two, while out of 7 traits being distant from the skull axis for as many
as five ones. An increase in the values of statistically significant FA factors for bilateral traits
was observed with the growing number of kits per litter
Responses to intra-luteal administration of cloprostenol in dairy cows
No full textThe aim of the study was to determine the luteolytic dose of cloprostenol administered directly into the corpus luteum (CL; intra-luteal treatment, ILT) in dairy cattle. Cows of two control groups were treated with 500 μg of cloprostenol (Estrumate®) intramuscularly (IM-500) or via ILT with 0.2 mL of physiological solution (ILT-0). Cows of four experimental groups were treated by ILT with cloprostenol in doses 5, 25, 50 and 100 μg (ILT-5, -25, -50 and -100 groups). Progesterone concentrations (P4) and size of CL were evaluated to assess luteolysis at 0, 0.5, 1, 2, 4, 8, 24 and 48 h or at 0, 24 and 48 h after ILT, respectively. Cows in the ILT-0 and -5 groups were unaffected by ILT. The P4 concentrations were less in cows of the IM-500, as well as ILT-25, -50 and -100 groups at 48 h subsequent to ILT. The size of the CL was less in cows of IM-500, as well as ILT-25, -50 and -100 groups at 48 h after ILT. There were P4 concentrations of about 1 ng/mL 48 h after ILT in cows of the IM-500, as well as ILT-50 and -100 groups. In conclusion, the cloprostenol dose of 50 μg administered intra-luteally is a luteolytic dose in cows
Fridericia crassiductata Dózsa-Farkas & Cech, 2006, sp.n.
No full textFridericia crassiductata sp.n. Type material deposited in the author’s (DózsaFarkas, K.) collection at the Department of Systematic Zoology and Ecology, Eötvös Loránd University, Budapest. Type locality: Zemplén Mountains, Hungary, Holotype: F. 14 (1967) Senyő–völgy, Zemplén Mountains, picked up from beech litter, 48 o 28 ’ 22 ” N, 21 o 25 ’ 59 ” E 214m, 20.04. 2004. coll. K. DózsaFarkas. Paratype: P. 81.1 (1968) Komlóska–völgy, Zemplén Mountains, 48 o 25 ’ 53 ”N, 21 o 27 ’ 30 ”E, 223m, purple moorgrass meadow, 28.05. 2003, one stained specimen coll. K. DózsaFarkas, M. Pobozsny, P. 81.2 (1969) Mlaka–rét, Zemplén Mountains, 48 o 24 ’04”N, 21 o 24 ’ 32 ”E, 497m, mixed hornbeambirches forest, 28.05. 2003, one stained specimen coll. K. DózsaFarkas, M. Pobozsny, P. 81.3 (1970) Senyő–völgy, Zemplén Mountains, 48 o 28 ’ 22 ” N, 21 o 25 ’ 59 ” E, 214m from beech litter, 20.04. 2004, three specimens, coll. K. DózsaFarkas, P. 81.4 (1971) Senyő–völgy, Zemplén Mountains, oak forest (Quercus cerris) 48 o 28 ’ 19 ”N, 21 o 25 ’ 58 ” E 217m, 20.04. 2004, three specimens, coll. K. Dózsa Farkas, P. 81.5 (1972) Mlaka–rét, Zemplén Mountains, beech forest 48 o 23 ’ 59 ”N 21 o 24 ’ 21 ”E 542m, 0 5.28. 2003, one praeclitellar half of body (the caudal part used of DNAbased examinations (in Table 1:No. 1) coll. K. DózsaFarkas, M. Pobozsny, P. 81.6 (1973) Bagolybérci gerinc, Zemplén Mountains, oak forest (Quercus petraea) 48 o 24 ’ 27 ’N 21 o 23 ’ 41 ”E 593m, 0 5.28. 2003, one specimen, coll. DózsaFarkas, M. Pobozsny. Etymology: ‘crassus’ (Lat.) = thick, ductus (Lat.) = duct, tube. Referring to the thick and long spermathecal ectal duct. Description Length 13–20 mm. Diameter 0.5–0.7 mm at VIII, and 0.6–0.8 mm at clitellum. Segment number (38) – 40 – 56. Chaetae (Fig. 1 A) a maximum of 10 per bundle, formula (Nielsen & Christensen 1959): 4,5,6,7 – 6,5, 4,(3,2): 7,8,9,10 – 8,7,6,5,4,(3,2). Outer chaetae much longer than inner, e.g. the outermost 76 – 85 μm long and the innermost 33–38 μm in a praeclitellar bundle, the outer 95–100 μm long and the inner 85–90 μm long at the caudal part of the body. Cutaneous glands: about 10 rows of brown reticulate cells per segment. The epidermis is often hard to see through, due to these brownpigmented cells on the anterior segments (Fig. 1 B). Body wall of medium thickness (about 38–47 μm) cuticle thin (3 μm). Head pore at 0/I, well visible (Fig. 1 C). Dorsal pores beginning from VII. Brain (Fig. 1 D) 1.2–1.5 times longer than wide (140–180 μm long) in the posterolateral regions one small aggregation of refractive globules on either side. Oesophageal appendage (peptonephridia) (Fig. 2 A) variable, proximally some short branches, the main tube extends to V with wide lumen, and 1–2 branches distally. Sometimes the proximal branches cannot be found. Pharyngeal glands (septal glands) all paired with ventral lobes (in VI distinctly largest often with posterior projection), dorsal connection absent. Nephridia 5 pairs from VI/VII – X/XI, postseptale 2,5times longer than the anteseptale, medial origin of efferent duct. Coelomocytes (Fig. 1 E): mucocytes type b (Möller 1971), small (20–24 – 32 μm) with refractile vesicle, often dark in transmitted light, lenticytes (length 5–11 μm) are scarce. Chylus cells not visible due to the dense dark chloragocytes. Dorsal blood vessel from (XV)–XVII–XVIII, blood colourless. Clitellum well developed, XII–XIII girdle shaped, hyalocytes and granulocytes arrangement reticulate (Fig 3). Seminal vesicle is very large, occupying 3–4 segments (VIII–XII). Sperm funnel (Fig. 4 A) 250–380 μm long and 140–160 μm wide, collar narrower than the funnel body. Spermatozoa about 264 μm long, head 95 μm. Male copulatory organ is 170–200 μm long, 80–140 μm wide and 80–120 μm high, the bursal slit (Fig. 4 B) is longitudinal with more transverse components. Three small subneural glands (Fig. 4 C) in the XIV–XV–XVI segment. The ectal duct of spermatheca (Fig. 2 B, 5 A) is very wide (35–48 μm) and long (580–640 μm), longer than the body diameter. The ectal duct canal is narrow (6–7 μm) throughout, and not widening proximally. Two (rarely three) large sessile eggshaped brown ectal glands (80–130 μm long, 60–75 μm wide) (Fig. 5 B, 5 C). The ampulla with a single ring of 9–10 large, sessile, globular diverticula (50–70 μm long), laterally compressed by each other, filled with sperm (Fig. 5 A). Proximal part of ampulla cylindrical with a wide lumen. There is a separate opening into oesophagus. Two to four mature eggs at a time. Distribution and habitat: Known only from the type locality (Zemplén Mountains [northeastern part of the Hungarian Central Mountains]), in beech, hornbeam and birch forest). Diagnosis The new species can be recognized by the following combination of characters: (1) the size of the body (1320 mm long, 0.5–0.7 mm wide, segment number (38)– 40–56); (2) the form of spermatheca, with 9–10 large, sessile, globular diverticula, long and thick ectal ducts, and two very large (80–130 μm long) eggshaped ectal glands; (3) maximum ten chaetae per bundle; (4) all pairs of pharyngeal glands with ventral lobes and the dorsal connection absent; (5) the clitellum is girdle shaped, hyalocytes and granulocytes arrangement reticulate; (6) seminal vesicle is large; (7) penial slit is longitudinal with more transverse components; and (9) three subneural glands in XIV–XVI. from F. ratzeli (Eisen, 1872) sensu Nielsen and Christensen, 1959 and F. eiseni Dózsa Farkas, 2005) in the following morphological properties: F. r a t z e l i (Eisen, 1872) sensu Nielsen and Christensen, 1959 has only small spermathecal ectal glands, the coelomocytes type are between type a and type c (while the new species has two large ectal glands and type b of coelomomucocytes with refractile vesicle). F. eiseni were found to have tiny spermathecal ectal gland(s), the ectal duct is far thinner (24–26 μm compared to 35–50 μm in F. crassiductata), the spermathecal diverticula is more or less the same shape in the new species, whereas the size of the diverticula of F. eiseni is variable and the two lateral ones are always larger. The shape of the spermatheca of F. crassiductata shows high morphological similarity with F. re g u l a r i s (Nielsen and Christensen, 1959), however, the ectal duct is far more slender and the ectal gland is absent or very small (see Schmelz, 2003, Fig. 61 A). Moreover, in the case of the latter species the oesophageal appendages are more coiled (type b) and the maximal chaetal number is four. Large Fridericia species with similar spermathecae (F. regularis Nielsen and Christensen, 1959, F. oconeensis Welch, 1914, F. firma Smith and Welch, 1913, F. agricola Moore, 1895) differ from the new species by the absence of the subneural gland(s). F. oconeensis differs from the new species by the thinner spermathecal duct and absent (or very small) ectal glands, furthermore, the small diameter of the spermathecal ampulla with diverticula (70 μm). Neither F. f i r m a, nor F. agilis Smith, 1895 and F. agricola possesses ectal glands of the spermatheca. In the case of F. agilis and all the four species mentioned above, the maximal number of chaetae does not reach 8 (it is 8–10 in the case of the new species). Finally, two other species described in Italy seem to be partly similar considering the spermatheca: F. gigantea Dequal, 1912 and F. florentina Dequal, 1914. F. gigantea is much larger (30–45 mm long, 90–95 segments). Also, F. florentina has more segments (85–90) and although it has two large spermathecal ectal glands, the spermathecal duct is short and the diverticula of the spermatheca are placed in two groups on the opposite sides of the ampulla.Published as part of Dózsa-Farkas, K. & Cech, G., 2006, Description of a new Fridericia species (Oligochaeta: Enchytraeidae) and its molecular comparison with two morphologically similar species by PCRRFLP, pp. 53-68 in Zootaxa 1310 on pages 57-60, DOI: 10.5281/zenodo.17385
The Quarries of Meroe, Sudan : Part 2 - Catalogue
No full textAbout Part 2Part 2 is a detailed catalogue of all 92 quarries recorded in the course of the project. All articles have extensive Arabic summaries.VideoThis two-part set is accompanied by five short educational and illustrative slideshows in English and Arabic about the authors’ work on the sandstone quarries around Meroe. The highlight is a 5-minute aerial and underground ‘fly-through’ video presenting quarry Q41, the largest and most impressive of the gallery quarries in the study area, available in 2D or 3D. All videos are available here: https://www.youtube.com/playlist?list=PL7-ic31cMSbvWosaClqx-qHJYtYWraVgB.AcknowledgementThis publication and the associated videos were made possible by NPRP grant 5-879-6-025 from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the author(s).Other InformationEditors: Brigitte Cech, Thilo Rehren and Abdelrahman Ali MohamedLicense: https://creativecommons.org/licenses/by/4.0See book on publisher's website: https://doi.org/10.5339/uclq.2018.9789927118883</p
The Stone-Cech Compatification
No full textThe Stone-fiech compactification PX has been a topic of increasing study since its introduction in 1937. The algebraic content of this research is collected in the 1960 textbook, Rings of continuous Functions, by L. Gillman and M. Jerison. Here we take a more purely topological viewpoint of the Stone-Cech compactification and attempt to collect the most important results which have emerged since Rings of Continuous Functions.
The construction of pX is described in an historical perspective. The theory of Boolean algebras is developed and used as a tool, primarily in a detailed investigation of 0 IN and p 3N\IN. The relationships between a space X and its "growth" PX\X are examined, including the non-homogeneity of $X\X, the cellularity of pX\X, and mappings of pX to PX\X. The Glicksberg product theorem which characterizes the products such that 0(x X ) = x (PX^) and related results are cc cc presented. Finally, the Stone-cech compactification is studied in a categorical context.</p
Stone-Cech extensions of probability measure spaces
No full textIt is proved that if and only if is a pseudocompact space, where is the space of probability Radon measures with weak topology and is a Stone-Cech extension of the space . A locally compact pseudocompact space is constructed such that is not pseudocompact. Conditions are obtained under which is pseudocompact.in russia
Remarkable harvestmen from the Czech Republic
No full textThe fauna of harvestmen of the Czech Republic is relatively well-known (SILHAVY 1956, MARTENS 1978). Still, species new for the country have recently been found both in natural (KLlMES & BEZDECKA 1995) and synanthropic habitats (KLlMES 1995). Our knowledge of the distribution of most species is, however, far from complete. For several species, including ones found relatively frequently, only a few localities have been reported from the Czech Republic up to now. In this paper we present some interesting findings of harvestmen in Bohemia (western Czech Republic) and Moravia (eastern part) which may stimulate further faunistic research in the territory (fig. 1)
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