218 THE EFFECT OF OVULATING AGENTS ON MATURE FOLLICLES IN BACTRIAN CAMEL (CAMELUS BACTRIANUS)

2010 ◽  
Vol 22 (1) ◽  
pp. 267
Author(s):  
Darab Nikjou ◽  
Amir Niasari-Naslaji
Keyword(s):  
The Netherlands ◽  
Research University ◽  
Linear Array ◽  
Bactrian Camel ◽  
Maximum Diameter ◽  
Gnrh Analogues ◽  
Mature Follicle ◽  
Short Life Span ◽  
Previous Definition ◽  
Ultrasound Scanner

Mature follicle response and CL formation following induction of ovulation using GnRH analogues and LH were investigated in Bactrian camel. Bactriancamels (n = 58) withamature follicle (12-25 mm)received 1) alarelin (Vetaroline®, Aburaihan,Tehran, Iran; 25 μg, i.m. 37/58); 2) buserelin (Receptal®, Intervet, Boxmeer, the Netherlands; 20 μg i.v. 16/58); or 3) LH (Lutropin®-V, Bioniche, Belleville, Ontario, Canada; 25 mg i.v. 5/58; Day 0 of experiment = day of inducing ovulation). Ovarian follicles were considered mature according to previous definition in Bactrian camel (Nikjou D et al. 2008 Theriogenology 69 491-500). Daily ultrasonography was conducted between Days -5 and 15 of the experiment using a real-time ultrasound scanner (Aloka 500, Tokyo, Japan) equipped with a 5-MHz linear array transrectal transducer. The day after inducing ovulation, the size of the mature follicle increased in 89.7% (52/58; 0.72 mm ± 0.11) or decreased in 10.3% (6/58; 0.75 mm ± 0.13) of observations. All mature follicles ovulated by 48 h after treatment. Corpus luteum was detected on Day 4.9 ± 0.13 at the diameter of 14.0 mm ± 0.31 and reached the maximum diameter of 20.2 mm ± 0.58 on Day 9.0 ± 0.13 after treatment. Vacuolated CL was detected in 14% of observations. Corpuralutea started to regress 1 to 2 days after reaching the maximum diameter. In conclusion, mature follicles, at the diameter of 12 to 25 mm, ovulated and normal CL with the short life span (about 10 days) formed consistently in response to the use of ovulating agent in Bactrian camel. Table 1.Changes in ovarian structures following injection of different GnRH analogues and LH Research was funded by the Deputy of Research, University of Tehran. The authors thank the companies Bioniche (Canada), Aburaihan (Iran) and Intervet (the Netherlands) for kind provision of pharmaceuticals.

scholarly journals Tracing transforming honors tracks - Arts and sciences beyond borders

2017 ◽  
Vol 1 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Peter Sonderen ◽  
Jur Koksma
Keyword(s):  
New York ◽  
Young People ◽  
The Netherlands ◽  
Research University ◽  
Honors Students ◽  
Art And Science ◽  
Joint Research ◽  
Arts And Sciences ◽  
Learning Journey ◽  
Responsible Manner

In this paper we describe how honors students of an art university and a classical research university in the east of the Netherlands, came together to work on the development of new ecologies of art and science. We narrate a yearlong learning journey by highlighting two main projects, first a local Wunderkammer project and subsequently a joint research trip to New York, Boston and Cambridge for investigating similar initiatives across the Atlantic. While going beyond the borders of disciplines and institutions, in search of new terrain, students reframe their own field as well. By experimenting with the form of our honors tracks we hope to widen the horizon of young people and help them unleash their potential. Our meandering story describes how the honors track kept on changing form, by allowing students to claim radical ownership, and how this has taught us that such experiments can not only be carried out in a responsible manner, but may also create more powerful environments for learning across borders.

Outbursts of comet Schwassmann-Wachmann 1, and the cloud of interplanetary boulders

1974 ◽  
Vol 22 ◽  
pp. 307 ◽  
Author(s):  
Zdenek Sekanina
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Interplanetary Space ◽  
Porous Matrix ◽  
Maximum Diameter ◽  
Expansion Velocity ◽  
Solid Constituent ◽  
Meteoric Material ◽  
Periodic Comet

AbstractIt is suggested that the outbursts of Periodic Comet Schwassmann-Wachmann 1 are triggered by impacts of interplanetary boulders on the surface of the comet’s nucleus. The existence of a cloud of such boulders in interplanetary space was predicted by Harwit (1967). We have used the hypothesis to calculate the characteristics of the outbursts – such as their mean rate, optically important dimensions of ejected debris, expansion velocity of the ejecta, maximum diameter of the expanding cloud before it fades out, and the magnitude of the accompanying orbital impulse – and found them reasonably consistent with observations, if the solid constituent of the comet is assumed in the form of a porous matrix of lowstrength meteoric material. A Monte Carlo method was applied to simulate the distributions of impacts, their directions and impact velocities.

Single molecule optical diffraction: A tool for understanding the structure of triple stranded left-hand helical cellulose

1989 ◽  
Vol 47 ◽  
pp. 1024-1025
Author(s):  
George C. Ruben ◽  
William Krakow
Keyword(s):  
Single Molecule ◽  
Helical Structure ◽  
Optical Diffraction ◽  
Maximum Diameter ◽  
Primary Cell Wall ◽  
Cellulose Synthesis ◽  
Left Hand ◽  
Left Handed ◽  
Freeze Dried ◽  
Diffraction Patterns

Tobacco primary cell wall and normal bacterial Acetobacter xylinum cellulose formation produced a 36.8±3Å triple-stranded left-hand helical microfibril in freeze-dried Pt-C replicas and in negatively stained preparations for TEM. As three submicrofibril strands exit the wall of Axylinum , they twist together to form a left-hand helical microfibril. This process is driven by the left-hand helical structure of the submicrofibril and by cellulose synthesis. That is, as the submicrofibril is elongating at the wall, it is also being left-hand twisted and twisted together with two other submicrofibrils. The submicrofibril appears to have the dimensions of a nine (l-4)-ß-D-glucan parallel chain crystalline unit whose long, 23Å, and short, 19Å, diagonals form major and minor left-handed axial surface ridges every 36Å.The computer generated optical diffraction of this model and its corresponding image have been compared. The submicrofibril model was used to construct a microfibril model. This model and corresponding microfibril images have also been optically diffracted and comparedIn this paper we compare two less complex microfibril models. The first model (Fig. 1a) is constructed with cylindrical submicrofibrils. The second model (Fig. 2a) is also constructed with three submicrofibrils but with a single 23 Å diagonal, projecting from a rounded cross section and left-hand helically twisted, with a 36Å repeat, similar to the original model (45°±10° crossover angle). The submicrofibrils cross the microfibril axis at roughly a 45°±10° angle, the same crossover angle observed in microflbril TEM images. These models were constructed so that the maximum diameter of the submicrofibrils was 23Å and the overall microfibril diameters were similar to Pt-C coated image diameters of ∼50Å and not the actual diameter of 36.5Å. The methods for computing optical diffraction patterns have been published before.

Umatilla Virus Association with Fibrils and Tubules in Cultured Cells

1980 ◽  
Vol 38 ◽  
pp. 476-477
Author(s):  
Neil M. Foster ◽  
Ruth D. Breckon
Keyword(s):  
Bluetongue Virus ◽  
Linear Array ◽  
Cultured Cells ◽  
Intimate Association ◽  
Infected Cells ◽  
Dark Staining ◽  
In Cells

Macrotubules have been described1 in cells infected with Umatilla virus (UMAV), an orbivirus for which bluetongue virus (BTV) is the protype. Macrotubules, often in linear array, were observed in the cytoplasm and in intimate association with viroplasms of infected cells. Macrotubules had outside and inside diameters of 20 and 15 nm and many had dark-staining centers with diameters similar to the interiors of the tubules. UMAV was 60 nm and the RNA core was 30 nm in diameter. This report describes the association of UMAV with macrotubules and two types of microtubules.

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