Abstract
Scent-marking is a predominant form of communication among felids, with urine spraying having a key role. Detectability and longevity of scent marks are recognized as crucial for efficiency ...of scent-marking, but there is limited research that has tested scent persistence with respect to various environmental factors. We used an experimental framework to measure human-perceived strength of felid urine smell and determine the effects of substrate, tilt and aspect of marked surfaces on persistence of the simulated scent marks. We used area under the curve (AUC), calculated for the scent strength of each scent-marked surface over time, as a proxy for urine scent preservation. Thereafter, we used ANOVA, followed by analysis of differences of interest between the marking sites, to assess the effect of environmental factors on human-perceived scent mark persistence. Odour persisted significantly better on rough surfaces, surfaces covered with moss and on surfaces with overhanging tilts, while there was no significant difference between the northerly- and southerly-oriented surfaces. The results are generally in accordance with the use and selection of marking sites previously reported for wild felids throughout the world, confirming that in their marking behaviour felids strive to prolong the persistence of scent marks. This knowledge will help researchers in interpretation of data on scent-marking and to evaluate the adaptive significance of this behaviour.
Meadow voles (Microtus pennsylvanicus) rely on olfactory communication, such as scent marking, to find and secure mating opportunities during the breeding season. Scent marks, and odors in general, ...provide information about the donors and persist in the environment for extended periods, allowing a wide audience. Whether a vole responds to another scent mark(s), or odor(s), depends on the social context and the information the odor provides about the donor(s). Therefore, we examined if male scent marking toward a social odor or female meadow voles is influenced by information present or previously encountered based on contextual differences in the social odor. We presented males with two odor associations of a male with a female with contextual differences in the age of the rival. We tested male scent marking under two conditions: one with two social odors present, current information, and a second with the females present from previously encountered social information, prior information. It was found that rival male age did not affect the scent marking behavior of males toward a social odor or female voles. Rival male age also did not affect preference as males did not show a preference for either female. The lack of an effect may lie in the properties of scent marks and the natural history of meadow voles during the breeding season. The odor of an individual rival may not represent a strong enough competitive threat to influence a signaler's decisions, but the association could still provide the signaler with valuable information about which females are considered high quality.
Meadow voles rely on olfactory communication during the breeding season, and due to sexually dimorphic behaviors, there exists the potential for the modulation of these behaviors due to social information. Previously, it was found that self‐grooming, another form of olfactory communication, was affected by the age of a rival in a social odor. But when tested under a similar paradigm, this informational context did not affect scent marking behavior of male meadow voles.
Fish marking is an essential tool for fisheries management, especially for evaluating the stocking of endangered fish species to support conservation and sustainable use of fish stocks. Batch marking ...of young European eels Anguilla anguilla (L.) prior to stocking is recommended as the benefits of stocking for the spawning stock can be evaluated by recapturing marked fish over time, therefore mass marking of young eels with substances such as alizarin red S (ARS) is becoming increasingly important. To improve the marking method and reduce marking costs when immersing glass eels in an ARS solution, eight laboratory experiments under varying conditions (e.g., temperature, ARS concentration, immersion time, osmotic induction, fish density) and with ARS from different suppliers were carried out. The results show that optimal marking of glass eels can be carried out in the field or during transport by putting approximately 50 g of glass eels per liter in 150 mg L−1 ARS solution for 3 h at 10–15°C. Lower concentrations did not result in reliable marking. Water temperatures of 5°C and below can have a stunning effect on the eels and increase mortality significantly, regardless of the concentration of ARS. Glass eel densities below 50 g L−1 in the marking bath increase marking costs unnecessarily, while a higher density of 100 g L−1 resulted in significantly higher mortality and lower marking success. A somewhat more difficult but less expensive alternative is to bathe the fish in a saline solution of 1% (10 PSU) of 80 mg L−1 ARS for 3 h at 10°C. Costs can also be significantly reduced by choice of supplier for ARS, but care should be taken as the quality of the powder appears to vary (mean percentage of sufficiently marked eels ranged from 59% to 91% among suppliers in the present study) and can lead to marking failure. The optimal marking conditions can help ensure that stocked glass eels can be reliably identified in future studies to assess stocking benefits while reducing costs.
CE marking for geosynthetics Delmas, Ph; Ehrenberg, H.
IOP conference series. Materials Science and Engineering,
10/2022, Letnik:
1260, Številka:
1
Journal Article
Recenzirano
Odprti dostop
Abstract
1
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October 2002, CE Marking has been implemented for Geosynthetics and from 1
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July 2013, it has been reinforced by the Construction Products Regulation (CPR 305/2011) making mandatory ...in all EEA Countries for manufacturers to apply CE Marking to any products covered by a harmonised European Standard (hEN) or a European Technical Assessment (ETA). Main principles of the CPR and of the harmonised European Standards are presented, including a rapid overview of the general rules imposed by the CPR, like Standardisation Request, position versus references to national requirements and assessment method(s). Secondly, the paper shows how to deal with CE Marking in practical use of Geosynthetics for the placement on the market and for specific requirements in construction jobs, for control of incoming products and for fit for purpose.
Autism is a neurodevelopmental disorder with a strong genetic component. Core symptoms are abnormal reciprocal social interactions, qualitative impairments in communication, and repetitive and ...stereotyped patterns of behavior with restricted interests. Candidate genes for autism include the SHANK gene family, as mutations in SHANK2 and SHANK3 have been detected in several autistic individuals. SHANK genes code for a family of scaffolding proteins located in the postsynaptic density of excitatory synapses. To test the hypothesis that a mutation in SHANK1 contributes to the symptoms of autism, we evaluated Shank1(-/-) null mutant mice for behavioral phenotypes with relevance to autism, focusing on social communication. Ultrasonic vocalizations and the deposition of scent marks appear to be two major modes of mouse communication. Our findings revealed evidence for low levels of ultrasonic vocalizations and scent marks in Shank1(-/-) mice as compared to wildtype Shank1(+/+) littermate controls. Shank1(-/-) pups emitted fewer vocalizations than Shank1(+/+) pups when isolated from mother and littermates. In adulthood, genotype affected scent marking behavior in the presence of female urinary pheromones. Adult Shank1(-/-) males deposited fewer scent marks in proximity to female urine than Shank1(+/+) males. Call emission in response to female urinary pheromones also differed between genotypes. Shank1(+/+) mice changed their calling pattern dependent on previous female interactions, while Shank1(-/-) mice were unaffected, indicating a failure of Shank1(-/-) males to learn from a social experience. The reduced levels of ultrasonic vocalizations and scent marking behavior in Shank1(-/-) mice are consistent with a phenotype relevant to social communication deficits in autism.
In recent years, natural rosin derivatives have gained significant importance in the production of sustainable bio‐based materials, including thermoplastic road marking paint (TRMP). This study ...evaluates the use of sustainable natural glycerol ester rosins as bio‐based binders in TRMP formulations, specifically focusing on pine, wood, and tall oil rosins. Various analytical techniques, such as FT‐IR, TGA, MALDI‐TOF‐MS and GPC‐HPLC, were utilized to analyze both unmodified and glycerol ester rosins. Standard tests, including acid number (mg KOH/g) ASTM D 465‐05 and softening point (°C) ASTM E 28‐99, were also conducted on the samples. The optimum synthesis conditions for glycerol ester rosins (GER) were determined as follows: a rosin/glycerol molar ratio of 2.54, catalyst/rosin weight ratio of 0.5%, and antioxidant/rosin weight ratio of 1.0%. GPC‐HPLC analysis revealed average esterification reaction yields of over 90.85%. Furthermore, TRMPs underwent various tests, including gloss factor (β), chromaticity coordinates (x, y), UVB aging, and softening point (°C). The results demonstrated that GERs exhibited superior performance, especially in the UVB aging test, with all TRMPs classified as UV1 type. These findings highlight the promising potential of GERs derived from different types of rosins in producing sustainable, environmentally friendly, and bio‐based next‐generation TRMPs.
Production processes of natural rosin, glycerol ester rosin, and thermoplastic road marking paint
From many years, the methods to defend against Denial of Service attacks have been very attractive from different point of views, although network security is a large and very complex topic. ...Different techniques have been proposed and so-called packet marking and IP tracing procedures have especially demonstrated a good capacity to face different malicious attacks. While host-based DoS attacks are more easily traced and managed, network-based DoS attacks are a more challenging threat. In this paper, we discuss a powerful aspect of the IP traceback method, which allows a router to mark and add information to attack packets on the basis of a fixed probability value. We propose a potential method for modeling the classic probabilistic packet marking algorithm as Markov chains, allowing a closed form to be obtained for evaluating the correct number of received marked packets in order to build a meaningful attack graph and analyze how marking routers must behave to minimize the overall overhead.
Recent advancements in vehicle automation and driver-assistance systems that detect pavement markings has increased the importance of the detectability of pavement markings through various sensor ...modalities across weather and road conditions. Among the sensing techniques, light detection and ranging (LiDAR) sensors have become popular for vehicle-automation applications. This study used low-cost mobile multi-beam LiDAR to assess the performance of several types of pavement marking materials installed on a limited-access highway in various conditions, and quantified the degradation in detection performance over three years. Four marking materials, HPS-8, polyurea, cold plastic, and sprayable thermoplastic, were analyzed in the current study. LiDAR reflectivity data extracted from a total of 210 passes through the test sections were analyzed. A new detectability score based on LiDAR intensity data was proposed to quantify the marking detectability. The results showed that the pavement marking detectability varied across the material types over the years. The results provide guidance for selecting materials and developing maintenance schedules when marking detectability by LiDAR is a concern.
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