Abstract
Using a complex of morphological methods, the muscle tissue of 18-month-old gobies of three cattle breeds (Hereford, Kazakh white-headed and Kalmyk) was studied. The results of the study ...showed that in the biceps femoris muscle and the longest muscle of the back of bulls of Hereford breed, the average diameter of muscle fibers was higher than in animals of the Kazakh white-headed and Kalmyk breeds. The thickness of the endomysium in the muscles of the animals studied was in the range of 6–13 μm and had no pronounced breed differences. Among the cellular elements of endomysium, endotheliocytes prevailed. Their share was about 80%. Type 1 collagen was higher in Hereford animals. In the muscles of animals of the Kazakh white-headed and Kalmyk breeds, the content of adipose tissue was higher than in animals of the Hereford breed. The results obtained reflect typical patterns of the structural and functional characteristics of cattle muscle tissue, and also show the range of in-breed variability of the muscle tissue of these animals.
Silicon photomultiplier and its possible applications Buzhan, P.; Dolgoshein, B.; Filatov, L. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2003, Letnik:
504, Številka:
1-3
Journal Article
Recenzirano
The Silicon Photomultiplier (SiPM) is a semiconductor device consisting of many photon microcounters (103mm−2) positioned on a common Si substrate. SiPM operates in a limited Geiger mode and has ...single photoelectron gain (106) and photon detection efficiency (20%) similar to vacuum PMT. Main SiPM features are described and a number of examples of its possible applications are demonstrated, such as scintillator fiber readout, scintillator tiles+WLS readout, imaging Cherenkov counter timing. These SiPM applications are based on experimental test data and SiPM performance is compared with other photodetectors (PMT, APD, HPD, VLPC).
Status report on silicon photomultiplier development and its applications Dolgoshein, B.; Balagura, V.; Buzhan, P. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/2006, Letnik:
563, Številka:
2
Journal Article
Recenzirano
Odprti dostop
The state of art of the Silicon Photomultipliers (SiPM's)—their features, possibilities and applications—is given. The significant progress of this novel technique of photo detection is described and ...discussed.
One of the main indicators of the successful adaptation of an organism to environmental conditions is a good reproductive ability of gobies. After all, the fertilizing ability of sperm is the most ...important quality indicator. Different breeds of animals are not equally resistant to environmental influences. In some, the changes are relatively superficial, in others, they lead to a significant change in the physiological functions of the body. Scientific research was carried out in the SPK PZ "Druzhba" Apanasenkovsky district, which is one of the driest regions of the Stavropol Territory, with a sharply continental climate. The histology, immunohistochemistry and morphometry of the testes (6 animals of each breed) of 18-month-old bulls of the Hereford, Kazakh white-headed and Kalmyk cattle breeds were influenced by climatic factors. The results of the study showed that 18-month-old bulls of all three studied breeds of cattle have full-fledged spermatogenesis. Structural elements of the connective tissue part of the wall of convoluted tubules demonstrated morphological equivalents of the integrity of the hematotesticular barrier. The proportion of tubules with pronounced destruction of spermatogenic epithelium was 2-3 percent. The diameter of the convoluted seminal tubules in animals of all breeds was more than 200 microns. The population of Leydig cells was characterized by a variety of cell forms, the predominant being rounded and polygonal cells with light nuclei and well-developed cytoplasm. The morphology of Leydig cells indicated their ability to actively synthesize sex hormones. A comparative analysis of the testes of gobies of the three studied breeds did not reveal any pronounced breed differences in the structure of the male sex glands of these animals. This indicates that the morphofunctional characteristic of the testes is a stable and conservative indicator, which changes little in the course of selection work.
The climatic conditions of the sharply continental climate of the Stavropol Territory influenced the skin of gobies of the Kalmyk, Kazakh white-headed and Hereford breeds. During the year, the skin ...of animals changed, which contributed to the adaptation of the body to the climatic conditions of the dry zone. These conditions influenced the histology and morphology of the skin of 18-month-old gobies of Kalmyk, Kazakh white-headed and Hereford cattle breeds (6 animals of each breed). The results of the study showed that the greatest thickness of the skin has the Kazakh white-headed bullocks (6544±153 microns). The smallest thickness of skin was in animals of the Hereford breed (5602±140 microns). Kalmyk and Kazakh white-headed bulls had a higher content of fine (downy) hair than Hereford bulls did. The content of sebaceous glands in Kalmyk bulls was 1.5 times higher than that in Hereford bulls and 1.1 times higher than that in the Kazakh white-headed breed. The number of sweat glands in the Hereford breed was 1.4 times higher than that in animals of the Kalmyk breed and 1.3 times higher than that in the Kazakh white-headed. The highest content of type I collagen is detected in the skin of animals of Kalmyk and Kazakh white-headed breeds. The presence of a greater thickness of the dermis in combination with an increased content of sebaceous glands in the skin indicates a higher adaptive capacity of animals of the Kazakh white-headed and Kalmyk breeds of cattle to live in extreme weather conditions and affects the quality of raw materials.
The purpose of research was to study the association of polymorphic variants of growth hormone gene with development, slaughter traits and carcass composition in crossbred Red Angus × Kalmyk ...bull-calves. The experiment was carried out at LLC "Agrofirma Aduchi" in Republic of Kalmykia. The object of the study was crossbred Red Angus × Kalmyk (F2) bull-calves. The use of Red Angus sires with a high concentration of G allele in GH gene in the reproduction system of a herd made it possible to obtain second-generation crossbred progeny with a genotype distribution of 0.0625: 0.5: 0.4375, respectively, VV: LV: LL. The frequency of V allele reached 0.3125. The superiority of heterozygous individuals in live weight reached 18.0 kg by the age of 18 months (P>0.05). The maximum carcass weight was established in the group of heterozygous individuals, their superiority was 25.3 kg (P <0.01). The advantage in carcass yield of carriers of the minor allele V was 1.7% (P<0.05). The heterozygous animals were superior in flesh part weight in half-carcass by 11.1 kg (P <0.001). A less pronounced intergroup difference was found in bone weight, which reached 1.2 kg (P> 0.05). The monitoring the genetic structure of the herd taken into account the allelic distribution in growth hormone gene will provide the development of meat productivity potential.
The influence of physical activity of varying intensity and hypodynamia on the morphological indices parameters of the internal organs of rats in the experiment was investigated. Animals were ...subjected to the forced swim test by Porsolt of varying duration and to immobilization. The intense exercise, as well as long-term lack of exercise, were reveled to lead to the pronounced structural defects in the internal organs, while moderate exercise can be considered as the most favorable.
Study of the SiPM double component recovery time Bychkova, Oksana V; Ilyin, Andrey L; Kayumov, Fred F ...
Journal of physics. Conference series,
11/2019, Letnik:
1390, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The recovery time of the Hamamatsu SiPM linear assembly was measured. The assembly contains eight SiPMs of 2.8mm active area diameter; pixel size is 15xl5mkm2. The assembly is used for Phase1 upgrade ...in hadron calorimeter of the CMS experiment. Recovering process is found to depend on the number of the pixels fired and varied from 7 ±1 ns to 23 ± 3 ns for 50 Ohm readout impedance.
Brennan’s conjecture for a conformal mapping
f
of the unit disk is proved under a certain condition on the Taylor coefficients of ln
f
′. Brennan’s conjecture is also proved in the case where 1/
f
′ ...expands into a series of simple fractions absolutely converging to zero. An estimate for the approximation of 1/
f
′ by simple fractions is obtained.
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