Experimental Studies on Domestic Cat as a Definitive Host of Spirometra Species | Chapter 4 | Contemporary Research and Perspectives in Biological Science Vol. 3

In the present study, domestic cats were used to elucidate if they were definitive hosts of Spirometra species. Cats were orally fed with spargana recovered from naturally infected frogs and from experimentally infected hamster mice. The spargana fed to domestic cats developed into adult worms. Eggs discharged by the adult worms were collected from faeces of infected domestic cats. Cats were sacrificed, adult worms were recovered, and measurements and morphology of the worms were taken. All results were compatible with Spirometra species. Therefore, the study confirms that domestic cats are the definitive host of Spirometra species.

 

Author (s) Details

Nicholas J. Kavana
Department of Microbiology and Parasitology, Faculty of Medicine, St. Francis University College of Health and Allied Sciences, Ifakara, Tanzania.

 

 Please see the book here:- https://doi.org/10.9734/bpi/crpbs/v3/2249

Emphasizing the Impact of Experiments in Physics Lessons – “Why, When, How Often?” | Chapter 7 | Current Perspectives on Chemical Sciences Vol. 9

 Science teaching and learning are incomplete without practical practises. The majority of school laboratories nowadays are well-equipped with experimental instruments and computer-based experimentation systems (Vernier, Pasco). Our main research question is whether using all of this equipment makes physics teaching more efficient. The aim of this paper is to explore the effectiveness of teacher-led laboratory work and experiments for students in different types of schools. Physics is an experimental science, and the most effective way to validate theoretical principles is through laboratory work. Students, like scholars, need to be able to evaluate their own thoughts. What methods do we need to improve or enrich students' scientific knowledge by the use of experiments? In the material of school curricula, examples of how to design learning results of hands-on experiments as well as computer-based experiments will be discussed.

Author (s) Details

Renata Holubova
Department of Experimental Physics, Faculty of Science, Palacky University, 17. listopadu 12, 771 46 Olomouc, Czech Republic.

View Book :- https://stm.bookpi.org/CPCS-V9/issue/view/44

Recent Advancement of Precision Large-Caliber Slot Cutting of Sheet Steel Using Single-Mode Fiber Laser Radiation

 We present the findings of an experimental and theoretical investigation into the properties and characteristics of large-caliber precision slot cutting of low-carbon steel sheets up to 10 mm thick by 1 kW single-mode fibre laser radiation. Slots with calibres from 20 to 60 (in some cases, up to 100) and widths up to around 60 microns have been obtained using periodic-pulsed single-mode laser radiation and oxygen as the cutting gas. The cutting speed (50-100 mm / min) was calculated and the precision cutting efficiency (about 3 percent) and laser radiation transport efficiency in waveguide mode (about 25 percent) were estimated. In the lasergas cutting method , it is possible to achieve 150-250 μm large slotted holes in metal sheets using laser cutting configurations based on few-mode ytterbium-doped fibres and disc lasers working on a 1.07 μm wavelength at a power of up to 5 kW and an efficiency of about 30 percent (which mainly differs from gas lasers). The parameters of the morphology and roughness of the cut surface were determined. Variations in the hardness and phase structure of steel were examined in the usual direction of the slot wall. A laser oxygen precision slot cutting qualitative model with deep channelling is proposed.

Author(s) Details

A. M. Soroka
Strazh-Laser Company, s. Besedy, Moscow Oblast, Russia.

V. P. Panchenko  Troitsk
Institute for Innovation and Fusion Research, ul. Pushkovykh 12, Troitsk, Moscow Oblast, Russia.

A. A. Vitshas
Strazh-Laser Company, s. Besedy, Moscow Oblast, Russia.

A. G. Zelentsov
Strazh-Laser Company, s. Besedy, Moscow Oblast, Russia.

K. S. Kravchuk
Technological Institute for Superhard and Novel Carbon Materials, ul. Tsentralnaya 7a, Troitsk, Moscow Oblast, Russia.

V. P. Menakhin
Strazh-Laser Company, s. Besedy, Moscow Oblast, Russia.

A. V. Yakson
Strazh-Laser Company, s. Besedy, Moscow Oblast, Russia.

View Book :- https://bp.bookpi.org/index.php/bpi/catalog/book/301