Biometric relationships between bone dimensions and body size are presented for topmouth gudgeon Pseudorasbora parva and sunbleak Leucaspius delineatus, two invasive fish species in the UK. This study also provides a tool for identification of these species using key bones. Such information facilitates the assessment of the potential role of these invaders in the diet of piscivorous fauna.
Biometric data are presented for common freshwater fish species in England and Wales. These enable the lengths and weights of fish in the diet of piscivorous fauna to be estimated from measurements of bones and scales that are recovered from faeces and stomach contents. Use of these data was demonstrated by reconstructing the length composition of species in the diet of cormorants from their faeces and an otter from its stomach contents. Both species were shown to be exploiting common size classes of abundant fish species in their home range.
To this day five Gobio gobio subspecies in northern, western and central Anatolia, in Turkey have been classified. Some subspecies were described based on 2-4 specimens by B a t t a l g i l (1942, 1944), L a d i g e s (1960), B ă n ă r e s c u & N a l b a t (1973), B ă n ă r e s c u (1992), B ă n ă r e s c u (1999). In this study, Gobio gobio specimens from the type localities of various running waters and lakes of norht, norhwest and central Anatolia were collected and ANOVA (analysis of variance), cluster analysis and canonical discriminant analysis were applied to fifty variables (eight meristic and forty-two metric characters derived from thirty-four measured or counted variables) to show the main differences between them. From these statistical analyses, Gobio gobio specimens were placed in one of three groups: G1 Beyşehir Lake; G2 Sakarya River Basin, Gerede and Melendiz Stream; G3 İnsuyu Stream, southwards from Tuz Lake. Measurements Standard length/Head height (SL/hH), Head length/Head height (C/hH), Standard length/Head length (SL/C), Predorsal distance/Postdorsal distance (pD/poD), Standard length/Postdorsal distance (SL/poD) and Standard length/Predorsal distance (SL/pD) were important characteristics for distinguishing the populations of Gobio gobio.
e determined regression relat ionships between head bone lengths and body size (standard length and weight) in chub Leuciscus cephalus and Eurasian perch Perca fluviatilis, two species taken frequently by the otter in the River Lee catchment. All relationships yielded significant linear equations, whereas those for bone vs. body weight were logarithmic. Regression slopes for head bones do not differ greatly within species but do across species of the same family.
The study of natural materials, a creating of their similarities from the point of view of constructions, structures and materials is relatively new and a perspective field connecting results of scientific research of biologists, chemists, physicists, material engineers, constructors and designers. At present day a lot of these results were transferred into the industry application. How we can see natural materials could become a source of inspiration on a field of materials, technologies and constructions as well as on the field of nanotechnologies. and Studium přírodních materiálů, vytváření jejich analogií z hlediska konstrukcí, struktur i materiálů je relativně novým a neobyčejně perspektivním oborem, který dokáže spojovat výsledky bádání biologů, chemiků, fyziků, materiálových inženýrů, konstruktérů a designérů. V současné době řada výsledků těchto výzkumů dosáhla i svých průmyslových aplikací. Jak je postupně zjišťováno, přírodní materiály se nám mohou stát zdrojem inspirace v oblasti materiálů, technologií a konstrukcí stejně tak jako v oblasti nanotechnologií.
Diabetes is a recognized risk factor of heart disease. The abnormalities related to a decreased heart performance probably arise at cellular and molecular levels already in the asymptomatic phase of diabetes. However, the early alterations initiating a sequence of events that culminates in the clinical signs have not been fully elucidated yet. This review deals with some biophysical methods applied to investigation of left ventricular myocytes in rats with streptozotocin diabetes, as well as our most important findings concerning diabetes-induced cell changes which cannot be captured by other techniques. The observed decrease in sarcolemmal membrane fluidity is causatively associated with increased glycation and glycoxidation. On the other hand, an increase in the mitochondrial membrane fluidity may be attributed to augmented energy transduction through the membranes. We reported for the first time concurrent measurements of membrane potential and dynamics, and respiratory chain activities in rat heart mitochondria, as well as calcium transients in the myocytes from diabetic hearts together with the assessed quantitative relationships among these variables. We were able to detect some significant alterations that may underlie myocyte dysfunction and subsequent remodeling of the heart. We suppose that not all these changes reflect mechanisms leading to pathology; some may represent adaptive and compensatory responses to diabetes., I. Waczulíková ... [et al.]., and Obsahuje bibliografii a bibliografické odkazy