Development of predatory behaviours in young southern tigrinas (Leopardus guttulus)

Mammalia ◽  
2017 ◽  
Vol 81 (4) ◽  
Author(s):  
Juliano A. Bogoni ◽  
Maurício E. Graipel ◽  
Pedro V. de Castilho ◽  
Nivaldo Peroni

AbstractPrey killing behaviours in juvenile wild cats are subject to most influence by their mothers and siblings. The learning strategies enable an individual to create opportunities for conspecifics to participate in operant conditioning. We present for the first time video recordings of two southern tigrinas learning to capture and kill a live cavy (

2020 ◽  
Vol 8 (9) ◽  
pp. 215-233
Author(s):  
Abraham A. Embi

Coronary artery disease progression involves a slow process of abnormal accumulation of lipid deposits to the inner walls of the arteries followed by an immune system response. It is known that an increase in lipid concentration could trigger cholesterol crystals deposition, thus starting a vicious cycle that could also progress into intra-arterial plaque formation, the hallmark of mature atheromas. The purpose of this manuscript is to introduce a proposed mechanism for the genesis of coronary artery disease; whereby the actual act of lipids crystallization starts a cycle demonstrated to induce additional crystallization via dehydration.  Experiments demonstrate for the first time via images and video-recordings showing that when the onset crystallization occurs near the tissue (≅ 1 mm) a dehydration triggered backward hydrodynamic suction or vacuum ensues with enough force to withdraw lipid molecules from human tissue; these molecules are shown to adhere to the crystals.


2019 ◽  
Vol 11 (2) ◽  
pp. 1
Author(s):  
Marie-Claire Cammaerts ◽  
Roger Cammaerts

Workers of the ant Myrmica sabuleti can acquire the notion of ‘nothing’, i.e. a basic concept of zero, through olfactory conditioning, the best when the odor is unpleasant (onion odor) and when the response to the absence of the odor is rewarded. With a pleasant odor (lavender, rosemary or vanilla odor), the ants learn best when the response to the odor is rewarded. To our knowledge this is the first time that olfactory operant conditioning is obtained in animals by rewarding their response to ‘nothing’. The present work also points out: - the impact of the kind and quality of the cue to be learned on the animals’ learning score, - the improvement of a given learning over successive similar learning experiments, - the obtaining of a better learning when the reward is associated with the animals’ preference.


2021 ◽  
Vol 51 (1) ◽  
pp. 65-79
Author(s):  
Lisa Lehmann ◽  
Clara Stefen

This study addressed the question whether it is possible to clearly differentiate between wild and tabby domestic cats on the basis of hairs (guard hairs in particular). The colour banding pattern of individual hairs is studied in this context for the first time. Also, hair length and width, as well as parameters of the hair cuticle were checked for differences, as it is well known that wild cats have long hairs and a fine, silky fur. Several banding patterns were observed, some shared between both cat forms, but with different frequencies. But this is not enough for species differentiation and more specimens need to be studied to get a better idea of the variation in this trait. The cuticle pattern even in the same region of the hairs (medium and shield-free part of the hair shaft) varies considerably and statistically significant differences were found only for few measured parameters: hair length, hair width and scale perimeter. Nevertheless, even most of them are not sufficient to determine wild or domestic cats. However, as expected, the hairs of wild cats are statistically significantly longer than those of tabby domestic cats, and hairs longer than 50 mm can be clearly attributed to wild cats.


Author(s):  
Janice Miller-Young

Peer Instruction (PI) is a widely used pedagogy which generally includes the use of two main teaching strategies: student pre-class preparation with an associated online quiz, and active in-class engagement including small-group discussions about conceptual questions. As an instructor trying this pedagogy for the first time, my purpose was to investigate both students’ learning and attitudes in my first/second year engineering dynamics course, using their answers to the reading quizzes as the main source of data. In short, students with the highest quiz marks did well in the course, indicating successful reading and learning strategies. Similarly, students with the lowest quiz marks attained lower overall marks. Students who did less well in the course were also more negative about the PI format (the class size of 17 did not allow for statistical analysis). Negative comments tended to be related to an expectation that the teacher should lecture more, indicating less understanding of cognitive principles. These results will provide a baseline for evaluating future teaching efforts which will include examining whether more directly encouraging deep learning strategies will be more effective for student learning.


Author(s):  
Vladyslav Yalovenko ◽  
Serhii Danets

The main tendencies in developing the methods of evaluating vehicles movement according to registrars when conducting automotive research of road accidents are considered. It is noted that modern video recorders, in addition to the standard recording of events in the form of video, have additional functions of recording the parameters of traffic, which allows more objective and in-depth investigation of the circumstances of road accidents. Goal. The aim of the work is development of the method of obtaining quantitative data that allow to estimate the parameters of vehicle movement on video recordings made with the help of DVR MiVue-j85. Methodology. Theoretical data of the functionality of the MiVue-j85 video recorder were verified and analyzed during the real experiment. The study includes an analysis of quantitative data to assess the parameters of vehicle movement on video recordings made using a video recorder MiVue-j85. Results. It is noted that this method currently has a number of disadvantages, which are the imperfect system of synchronization, display and recording of the received data using software designed for the DVR. The presence of integrated in the DVR GPS-navigation and G-sensor, make it possible to determine the parameters of the vehicle and the coordinates of the location of the vehicle in the process of changing its dynamics, but with a significant error that does not meet the requirements of accident research. Originality. For the first time, the method of obtaining vehicle motion parameters using a video recorder with a built-in G-sensor is shown. Practical value. The obtained results can be used in practice in the study of the circumstances of the accident. Application of the certain method will allow facilitating the process of reception of initial data, namely the parameters of vehicle movement when studying road accidents.


2010 ◽  
Vol 26 ◽  
pp. 47-64 ◽  
Author(s):  
Roy Ballantynet ◽  
David Anderson ◽  
Jan Packer

AbstractAlthough the important role of providing fieldwork experiences for students in the natural environment is now well-established within environmental education literature, there is still little research evidence to guide teachers in their choice of effective teaching strategies. This paper presents findings from an interpretive case study designed to investigate the value of combining experience-based fieldwork in a mangrove and coastal environment with reflective and metacognitive activities. Analysis of video recordings, researcher observation notes and interviews of a class of Year 11 biology students who participated in the activities resulted in the emergence of five themes. These themes together provided evidence of enhanced student environmental learning, and included student appreciation for various learning contexts, self-awareness of group learning processes, and awareness of the integration of cross-curriculum knowledge. The study supports and illustrates the contention that the most effective environmental learning experiences are likely to be those that integrate learning in the natural environment with classroom learning strategies.


Parasitology ◽  
2008 ◽  
Vol 135 (8) ◽  
pp. 897-902 ◽  
Author(s):  
H. CABALLERO-ORTEGA ◽  
H. QUIROZ-ROMERO ◽  
S. OLAZARÁN-JENKINS ◽  
D. CORREA

SUMMARYAn indirect ELISA and an immunoblot were standardized to detect anti-Toxoplasma gondiiantibodies in sheep, and were compared with a commercial ELISA as reference. Sensitivity was 92·0 and 96·0%, and specificity 88·0 and 75·0%, respectively. Then the serum samples of 103 sheep on a ranch located in the Eastern region of Mexico were analysed. A frequency ranging from 77 to 84% was observed, with a heterogeneous pattern among the animals by immunoblotting. Ten months later 56 sheep were sampled and tested again. Six animals became negative while 1 case was negative the first time and strongly positive 10 months later. Considering this to be a new case we calculated an incidence rate of 2·1% (CI95%0·6–4·8%). IgG avidity ELISA was performed on 36 positive samples, 33 being of high-avidity at both times; slight increases in 2 samples and conservation of low-avidity in 1 sheep were also observed. Higher prevalence rates of toxoplasmosis in a moist warm compared to a cold atmosphere was attributed to the long viability ofT. gondiioocysts. This may explain the high frequency ofT. gondiiin this region, which apparently has favourable climatic conditions for the transmission of this protozoan, besides the presence of both domestic and wild cats.


Rheumatology ◽  
2021 ◽  
Vol 60 (Supplement_1) ◽  
Author(s):  
Sandra Robinson ◽  
Nicola Adams ◽  
Jason Scott ◽  
Claire Walker ◽  
Andrew Hassell ◽  
...  

Abstract Background/Aims  Education prior to starting therapeutic drugs is essential so that patients understand how to take them, what to expect in terms of effects and anticipated side effects, also for monitoring and supply requirements. The benefits of methotrexate can be delayed, tolerability problems are common, side effects can be severe and the drug is used in much bigger doses for cancer treatment which could complicate internet searches, therefore education is essential. Undertaking education is a fundamental role for Rheumatology nurses. We were interested to explore this interaction between nurse and patient using video recordings. Methods  Recordings were conducted of nurses educating patients prior to starting methotrexate, for the first time. The recordings were downloaded and reviewed minute by minute and were scored against items of the Calgary Cambridge (C-C) consultation model on a 4-point scale: 0= no evidence; 1= needs development; 2= competent; 3= excellent. Additionally, transcripts were typed and analysed thematically. Videos were further analysed quantitatively for each utterance and body movement using the Medical Interactive Process System (MIPS). Results  Ten recordings involving four nurses were made. The C-C assessment showed good structure, content and flow, driven by the use of an information leaflet. The nurses dominated the conversation speaking for between 69-86% of the time and involved the patient sparsely during the encounter, there was also little checking to ensure the patient understood the information being conveyed. Thematic analysis also showed that the nurse agenda dominated, and frequently brought the encounter back to the contents of the leaflet. Cues from the patients to discuss topics important to them, were often missed. Nurses recognised that they were often overloading the patient with information. The MIPS analysis showed that “giving information” dominated the nurse utterances and head nodding and assent by positive utterances dominated for the patient. Interestingly there was a lot more head nodding than positive utterances suggesting that head nodding was more about deference to the nurses perceived higher status rather than indicating understanding. Nurses in the higher scoring interviews on the C-C comparison made more illustrative gestures, asked more open questions with more checking and summarising and less interruptions. Patients in lower scoring interviews were more animated with gestures and head movements. They also checked information given and interrupted more. Conclusion  Nurses are doing many things well but consultations could be improved with training aimed at improving patient participation, awareness of cues, checking and summarising understanding. Also, interpretation of body language could be improved. Nodding does not necessarily indicate understanding and an animated patient who interrupts and checks is probably not having their perspective addressed. Disclosure  S. Robinson: None. N. Adams: None. J. Scott: None. C. Walker: None. A. Hassell: None. S. Ryan: None. D. Walker: None.


2009 ◽  
Vol 5 (3) ◽  
pp. 310-312 ◽  
Author(s):  
Ellouise Leadbeater ◽  
Lars Chittka

Natural selection should lead animals to use social cues (SC) when they are useful, and disregard them when they are not. Theoretical investigation predicts that individuals should thus employ social learning ‘strategies’, but how might such context specificity be achieved on a proximate level? Operant conditioning, whereby the use of SC is reinforced through rewarding results, provides a potential mechanism. We investigate the role of reinforcement in joining behaviour in bumble-bees, Bombus terrestris . When bees visit unfamiliar flower species, they prefer to probe inflorescences where others are also foraging, and here we show that such behaviour is promoted through experience when conspecific presence reliably predicts reward. Our findings highlight a straightforward, but rarely discussed, mechanism by which animals can be selective about when to use SC.


2006 ◽  
Vol 12 (3) ◽  
pp. 189 ◽  
Author(s):  
Mark C. Gardener ◽  
Curtis C. Daehler

Many plant species require the services of an animal pollinator. In Hawai'i most endemic plant species are declining, yet their pollinators are often unknown because floral visitors are uncommon, or because visits occur at night, making them difficult to observe. Information about the pollination ecology of rare plants is needed to help develop a conservation strategy. We used an automated, infrared-equipped video system to record animal visits to the flowers of rare plant species on the island of O'ahu, Hawaii. Over 500 hours of recordings were made on four plant species. For the first time, a nocturnal moth was observed visiting Cyrtandra hawaiensis. Also for the first time, native masked bees, presumed to be Hylaeus connectans, were recorded visiting the flowers of two endangered lobeliads, Cyanea pinnatifida and Cyanea superba. An introduced bird, the Japanese White-eye Zosterops japonicus also visited the Cyanea species, but it appeared to act as a nectar robber. A third lobeliad, Clermontia kakeana, was observed continuously for several days and nights but only visits by ants were recorded and no fruits were produced. While it was not always possible to determine the actual species of invertebrate floral visitors, the continuous nature of our video recording allowed us to document floral visitors that were not previously known. Furthermore, the recordings can be made without potential artefacts introduced by the presence of human observers near the flowers. This methodology can be used to document many difficult-to-observe ecological interactions between animals and rare plants.


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