Table Surface Research Articles

Detection Staphylococcus aureus contaminated some door handles and table surfaces and their sensitive to antibiotics

The current study's objective was to identify and isolate Staphylococcus spp. germs from a few of Omar Al-Mukhtar University's faculty laboratories. It is regarded as the first investigation carried out at Omar Al-Mukhtar University to assess the level of Staphylococcal bacterial contamination of door handles and table surfaces inside the laboratories. 33 isolates from the College of Science's Botany Department were used in the study, which took place in the department's laboratories during the fall semester of the academic year (2022). After evaluating the expanding colonies and using morphological inspections and biochemical tests to diagnose the isolates, it was showed that 90.9% of the samples from the Botany Department were Staphylococcus and that the percentage of S. aureus reached 36.7% of isolates of Staphylococcus. A biofilm-forming capacity was demonstrated by 80% of the isolated bacteria, of which 29% were S. aureus. In order to ascertain the effectiveness of the antibiotics and which ones the bacteria are resistant to, the sensitivity of thirty S. aureus isolates to hospital-grade antibiotics against infection was tested. The findings revealed a high level of resistance to the majority of antibiotics and a definite resistance to gentamicin. Methicillin-resistant MRSA isolates made up 73.3% of the isolates, whereas vancomycin-resistant VRSA isolates made up 70%.

Antimicrobial resistance, enterotoxin and biofilm production genes in Staphylococcus spp. isolated from facilities and fomites in veterinary hospital in the Caatinga biome.

The Caatinga biome occurs only in Brazil and offers epidemiological conditions that should be assessed differently from other regions of Brazil and the world. Thus, the aim of this survey was to identify antimicrobial resistance, enterotoxin and biofilm production genes in Staphylococcus spp. isolated from facilities and fomites in a veterinary hospital in Caatinga biome. Samples were collected from surfaces of small animal clinical care tables (n =8), cages in the dog and cat hospitalisation sector and animals with infectious diseases (n = 21), small animal surgical centre (n =8), sterilisation sector (n =7) and stethoscopes (n = 32) by using sterile swabs. Bacterial isolation and identification, antimicrobial resistance phenotypic test and molecular detection of antimicrobial resistance, biofilm formation and enterotoxin genes were carried out. Ninety-five bacterial isolates were obtained, and 29 (30.5%) were identified as Staphylococcus spp. Overall, 13 isolates (44.8%) of six species of Staphylococcus spp. showed antimicrobial resistance profile, as well as S. haemolyticus expressed phenotypic profile of multidrug resistance. The antimicrobials with the highest resistance rates were penicillin and tetracycline. The most frequent resistance genes were blaZ and tetM, both detected in 10 (76.9%) isolates. The mecA, tetL and tetK genes had frequencies of 38.5% (5/13), 23.1% (3/13) and 15.4% (2/13), respectively. The biofilm production marker, icaD gene, was detected in one S. sciuri strain. SEE gene, which encodes enterotoxins, was detected in 15.4% (2/13) of the strains (S. pseudintermedius and S. intermedius). The occurrence of Staphylococcus spp. carrying resistance genes to diferent classes of antimicrobials, presenting MDR phenotypic pattern and carrying enterotoxins and biofim encoding genes recovered from veterinary hospital facilities and fomites in the Caatinga biome reinforce the need to implement prevention cares in veterinary practices to avoid One Health-concerning conditions.

The Influence of Environmental Factors on Performance in Table Tennis: A Literature Study

This study aims to explore the influence of environmental factors such as lighting, temperature, humidity, noise, and table surface type on performance in table tennis. A literature review method was used to analyze findings from various relevant studies in this field. The results of the review indicate that environmental factors play a significant role in affecting concentration, physical and mental performance, as well as players' game control in table tennis. Low lighting, extreme temperatures, high humidity, environmental noise, and table surface type are significant variables in influencing player performance. The implications of this research underscore the importance of understanding and adapting to environmental factors for table tennis players to enhance their performance and achievements in this sport. Further research is recommended to delve deeper into the interaction between environmental factors and performance in table tennis.

Assessment of the Bacteriological Properties of Indoor Dust in some Classrooms of Delta State University of Science and Technology, Ozoro

The bacteriological properties of indoor dust in some classrooms of the Delta State University of Science, Ozoro was examined with a view to identify any possible source of pollution of classroom indoor air quality; measurement of microbial load of classroom dust sample and to compare findings of selected locations as a means to determine high air polluted areas. This was done by the collection of dust samples from classrooms table and chair surfaces. It was observed that the amount of bacteria available in classrooms differ based on activities in and around the classrooms. Bacteria isolates indicated the presence of pathogen associated with disease such as Bacillus sp; Staphylococcus sp; Micrococcus sp. of indoor air pollution exist and this is identified as open dump practice birthing more microbial cells which are transported through air and poor sanitation practice around and within the classrooms. Contamination of sample was observed for dust at different locations with the bacteria count seen to be higher at sample C (1.8x102cfu/m3) and lower in sample D (0.2x102cfu/m3). Staphylococcus sp dominated all the locations that were analyzed while Micrococcus sp. only occurred in site C. This is because poor environmental sanitation is observed at certain classrooms in addition to shattered classroom windows given an ease of access of dust flow indoor. It can be concluded that only a minimal sources of indoor air pollution exist and hence only a small amount of bacteria is present. In spite of this, prevalence of such practices is likely to promote the growth of more microbial cells.

Effect of an extraoral scavenging device on eliminating droplets and aerosols generated in ultrasonic supragingival scaling: A randomised clinical trial.

Ultrasonic scaling is extensively applied as part of the initial therapy for periodontal diseases, which has been restricted since the outbreak of the COVID-19 pandemic due to droplets and aerosols generated by ultrasonic devices. An extraoral scavenging device (EOS) was designed for diminishing droplets and aerosols in dental clinics. The objective of this study is to evaluate the effect of EOS on eliminating droplets and aerosols during ultrasonic supragingival scaling. This single-blinded, randomised controlled clinical trial enrolled 45 patients with generalised periodontitis (stage I or II, grade A or B) or plaque-induced gingivitis. The patients were randomly allocated and received ultrasonic supragingival scaling under three different intervention measures: only saliva ejector (SE), SE plus EOS and SE plus high-volume evacuation (HVE). The natural sedimentation method was applied to sample droplets and aerosols before or during supragingival scaling. After aerobic culturing, colony-forming units (CFUs) were counted and analysed. Compared with the level before treatment, more CFUs of samples throughout treatment could be obtained at the operator's chest and the patient's chest and the table surface when using SE alone (p < 0.05). Compared with the SE group, the SE + EOS group and the SE + HVE group obtained decreasing CFUs at the operator's chest and the patient's chest (p < 0.05), while no significant difference was determined between these two groups. The EOS effectively eliminated splatter contamination from ultrasonic supragingival scaling, which was an alternative precaution for nosocomial contamination in dental clinics.

Improving the quality of mustard seeds during pre-sowing preparation

Improving the quality of mustard seeds during pre-sowing preparation

Bacteriological Analysis and Plasmid Profiles of Surfaces of Some Hospital Kitchen Equipment in Benin City, Nigeria

The surfaces of hospital kitchen equipment could be a major source of transmission of resistant pathogens to patients. Hence, the objective of this paper was to assess the bacteriological and plasmid profiles of surfaces of tables, sinks, chopping-boards, gas cookers and freezer handles hospital kitchen equipment in Benin City, Nigeria using appropriate standard microbiological techniques. Bacterial plasmids were isolated and separated using the agarose gel electrophoresis. Plasmid curing was performed using acridine orange. The antimicrobial sensitivity pattern showed that the bacterial isolates exhibited varying degree of resistance to the antibiotics. Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were highly resistant to the antibiotics, having multiple antibiotic resistances (MAR) index of 0.6. Micrococcus spp. and Klebsiella pneumoniae were the least resistant to the antibiotics. Plasmid analysis revealed the presence of single and multiple-banded plasmids with sizes ranging from 100-1000bp. After curing, all the isolates (except S. aureus, E. coli and P. aeruginosa) were sensitive to all the antibiotics, indicating a significant reduction in antibiotic resistance after curing. The results revealed that plasmids played a significant role in conferring resistance on the isolates. Regular cleaning and disinfection should be strictly observed in hospital kitchens to prevent outbreaks and spread of resistant pathogens in hospitals.

Effect of energy density on quality and properties of 18Ni300 laser clad layers by laser cladding

By preparing the 18Ni300 laser clad layers at different energy densities, the pores of the laser clad layers were measured and analyzed by using the image method, and the effect of energy density on the porosity was explored by combining the experimental data. The experimental results show that the cross-sectional pores of the laser clad layers are regular in shape and do not intersect with each other, and most of the pores are gathered at the top edge of the fused cladding layer. The influence of process parameters on the morphology of the laser clad layer is obvious. The study shows that the influence of process parameters on porosity is in the order of laser power, scanning speed, and powder feeding voltage; combined with the analysis of variance table and response surface diagram, the interaction between the parameters is obvious, and combined with the change, it can achieve the purpose of reducing porosity. Porosity first increases and then decreases with the increase in the energy density, and the distribution of the energy density and porosity is divided into regions, and larger porosity can be avoided by selecting the regions. The hardness of the laser clad layer can be increased by the choice of energy density. The laser clad layer with good test results was observed to contain Co, α-Fe, and Fe7Ni3 intermetallic compounds. The microstructure is transformed from fine grains at the top to columnar dendrites at the bottom.

Deep learning-based control framework for dynamic contact processes in humanoid grasping.

Humanoid grasping is a critical ability for anthropomorphic hand, and plays a significant role in the development of humanoid robots. In this article, we present a deep learning-based control framework for humanoid grasping, incorporating the dynamic contact process among the anthropomorphic hand, the object, and the environment. This method efficiently eliminates the constraints imposed by inaccessible grasping points on both the contact surface of the object and the table surface. To mimic human-like grasping movements, an underactuated anthropomorphic hand is utilized, which is designed based on human hand data. The utilization of hand gestures, rather than controlling each motor separately, has significantly decreased the control dimensionality. Additionally, a deep learning framework is used to select gestures and grasp actions. Our methodology, proven both in simulation and on real robot, exceeds the performance of static analysis-based methods, as measured by the standard grasp metric Q1. It expands the range of objects the system can handle, effectively grasping thin items such as cards on tables, a task beyond the capabilities of previous methodologies.

Determination of Ways of Improving the Process of Separation of Seed Materials on the Working Surface of the Pneumatic Sorting Table

Abstract The object of the study is the process of separation of seed material according to the seed density on the working surface of the pneumatic sorting table. The main defining design variables and linkage parameters of the equipment are analyzed, which realizes the process of separation of seed materials, and is coordinated with physical and mechanical variables of raw materials. The principles of modeling of seed material layer movement as a multiphase medium are provided. Under the effect of working surface vibrations and the power of an airstream the layer take on the properties of pseudoliquid. The criteria of chosen variables are presented, on which depend quality and quantity indicators of the separation process of seed materials according to the seed density. Optimal values of the separator linkage parameters are analytically determined and dependence diagrams are built. Secant lines of surfaces for a concrete crop (raw material) are performed. The “purity” of heavy fraction during the variation of indicated parameters is studied. It is proved that there are differences in types of the dependences: different decreasing of functions and increasing of airstream velocity. It is obvious that this nature is determined by difference in density of original raw materials. This way the smallest influence a change in the air-stream velocity causes to soybean raw material, as soybean has the biggest density. At the same time, the biggest affect is provoked on sunflower seeds, which have the smallest density among the used types of raw materials, as well as a triangle form. It is determined that the maximal frequency of the basic fraction, gained by the separation of wheat seed material on PST, is obtained under the airstream velocity in the range 1.3-1.5 m·s−1. For corn the rational air-stream velocity falls in the range 1.3-1.6 m·s−1, for sunflower – 1.2-1.4 m·s−1, for soybean – 1.2-1.4 m·s−1. These figures are valid under the condition of using the relevant rational decisions of frequency and amplitude of vibrations of pneumatic sorting table deck during the separation of grain mixtures, as well as longitudinal and transverse angles of inclination. The veracity of experimental studying results is proved by the corresponding theoretical models of the process.

Microbiological analysis: Prevalence of salmonella, staphylococcus, and proteus on the surface of table and hatchable eggs, along with their antibiotic sensitivity profile

Microbiological analysis: Prevalence of salmonella, staphylococcus, and proteus on the surface of table and hatchable eggs, along with their antibiotic sensitivity profile

Assessment of the bacteriological qualities of meat and contact surfaces in markets in Abia State, Nigeria

Background: Microbial contamination of meat comes from external sources during cutting, handling, and processing of the meat. This study was carried out to assess the bacteriological qualities of meat and contact surfaces in markets in Abia State, Nigeria. Methods: This research involved the use of a Hazard Analysis Critical Control Point (HACCP) checklist to investigate the sanitation and hygiene practices of meat sellers and a laboratory study of red and white meat, water, and meat-contact surface samples. A total of 425 meat samples collected from 425 meat sellers from some randomly selected markets in Abia State were used for the study. There were also 20 water samples, 22 samples from table surfaces, 22 samples from knife surfaces, and 14 samples from transport vehicles. The multistage simple random sampling technique through balloting was employed to determine communities/markets for the study. Samples for the study were collected and analyzed using standard microbiological techniques such as culturing and the bacteria were enumerated and identified using biochemical and chemical tests. Results: The prevalent bacterial isolates include Staphylococcus sp (78.80%), Bacillus sp (73.17%), Enterococcus sp (64.00%), Escherichia coli (62.11%), Salmonella sp (62.11%), Klebsiella sp (51.29%), Micrococcus sp (44.94%) and Campylobacter sp (43.52%). SPSS analysis using the one-way ANOVA showed no significant difference (p &gt; 0.05) in bacteria isolated from markets in the three Senatorial Zones of the State. Staphylococcus sp was isolated in 61.11% of the tables, 50.00% of vehicles, 41.67% of knives and 46.32% of water; Salmonella sp was isolated in 47.22% of the tables, 36.11% of vehicles, 30.56% of knives and 43.85% of water; Bacillus sp was isolated in 41.67% of the tables, 44.44% of vehicles, 33.33% of knives and 23.70% of water; Campylobacter sp was isolated in 27.78% of the tables, 25.00% of vehicles, 30.56% of knives and none in water. There was no significant difference (p &gt; 0.05) in bacteria isolated from the contact surfaces and water from the markets in the three zones of the State. Conclusion: The bacteriological quality of meat in markets in Abia State could be said to be poor due to the isolation of Indicator bacteria such as E, coli, Salmonella, and Campylobacter from the studied meat samples. The presence of E. coli in the studied meat samples is an indicator of feacal contamination and a red alert for the Public health sector. It is recommended that meat sellers undergo proper training and regularly update their knowledge of meat safety.

Experimental and numerical studies for the performance verification of post-installed anchors used in electrical cabinet fixation

ABSTRACT Most of the electrical equipment responsible for the control within a power plant is configured in cabinet form and fixed using post-installed anchors. Shaking table testing to evaluate the seismic performance of cabinets does not simulate the same installation conditions as on-site, but simply welds the bottom of the cabinet to the top surface of the shake table to assess the structural integrity. The seismic performance evaluation of post-installed anchors is typically conducted indirectly through material testing, making it necessary to compare the performance under on-site conditions to ensure reasonable measurement. This study fabricated a structure as a replacement for the cabinet, fixed it using post-installed anchors, and applied static loads to measure the pull-out load transmitted to the anchors. The measured results were then compared with those obtained from material testing. Consequentially, the pull-out load in the test reflecting on-site conditions was approximately 10% higher than in the material test. So the current way of indirectly evaluating the performance of post-installed anchors is deemed reasonable based on the derived results. To validate the reliability of the experimental study, a numerical study was conducted, and the results showed an error range of around 1%, indicating reasonable and consistent findings.

Production studies of the disinfectant “Enzidez”

The main task of carrying out disinfection measures in veterinary medicine is to break the mechanisms of pathogen transmission through objects and objects of the environment from one animal to another. Therefore, disinfection measures are the basis of safe keeping of animals, carrying out treatment and preventive measures in clinics of veterinary medicine. The purpose of this study was to determine the effectiveness of the created disinfectant “Enzidez” in the production conditions of veterinary medicine clinics. The surfaces of walls, floors and tables were disinfected by wiping. Surgical, dental instruments and veterinary products by immersion in a solution or wiping. Before and after treatment, washings were taken for microbiological examination by generally accepted methods. It was established that the effectiveness of disinfection with “Enzidez” in a concentration of 0.25–1.00 % of walls, floors, tables in veterinary clinics, for their various microbial and organic contamination, was 100 %. Only in one case, after disinfection with a 0.25 % solution, microorganisms were released from the floor surfaces, amounting to 3.8 ± 0.1×101 CFU/cm3 of wash. However, even under this regime, the disinfection efficiency was 99.99 %. The effectiveness of disinfection with “Enzidez” during the presterilization cleaning of surgical instruments and veterinary products revealed that the main microflora before treatment was represented by staphylococci, micrococci, corynebacteria, streptococci, yeast, coliform bacteria in the amount of 103 to 105 CFU/cm3 of washing. After treatment with a concentration of 0.25 to 1.00 %, the disinfectant provided a bactericidal effect, as a result of which microorganisms were not isolated from the surfaces in any case. Therefore, we believe that the developed means for disinfection, pre-sterilization cleaning and sterilization in veterinary medicine clinics “Enzidez” is a highly effective disinfectant for use in a concentration of 0.25–1.0 % and exposure of solutions for 15–30 minutes.

Tropical peat surface oscillations are a function of peat condition at North Selangor peat swamp forest, Malaysia

Tropical peatland condition across southeast Asia is deteriorating as a result of conversion to agriculture and urban zones. Conversion begins by lowering the water table, which leads to peat decomposition, subsidence and increased risk of large-scale forest fires. Associated changes in mechanical peat properties impact the magnitude and timing of changes in peatland surface motion, making them a potential proxy for peatland condition. However, such a relationship is yet to be observed in a tropical peatland setting. This study aimed to establish whether patterns of tropical peatland surface motion were a function of peat condition at North Selangor Peat Swamp Forest in Selangor, Malaysia. Results showed that subsidence was greatest at fire-affected scrubland sites, whilst the lowest mean water table levels were found at smallholder oil palm sites. Peat condition and magnitude of tropical peat surface oscillation were significantly different between peat condition classes, whilst peat condition differed with depth. More degraded tropical peats with high bulk density throughout the peat profile due to high surface loading and low mean water table levels showed greater surface oscillation magnitudes. The dominant peat surface oscillation mechanisms present at all sites were compression and shrinkage from changes in water table level. Mean water table level and subsidence rate were related to surface oscillation magnitude. However further work towards measuring surface and within-water table range bulk densities and surface loading is required to better understand the controls on surface oscillation magnitudes.

Variation in Genuine Handwriting While Writing on an Unusual Surface

Forensic handwriting analysis is a specialized field within forensic science that aims to identify and compare handwriting samples for investigative purposes. This scientific note provides an overview of the fundamental principles, methodologies, and techniques involved in the examination of handwriting evidence. The note explores the importance of handwriting analysis in criminal investigations, discusses the underlying scientific principles, and highlights the challenges faced by forensic experts in this field. Additionally, it explores the advancements in technology that have aided the analysis of handwriting and conclude with the potential future directions of research in forensic handwriting analysis. This study focuses on the natural variation that occurs due to the unusual surfaces of tables and bricks, the variation occurs mostly in the class characteristics of the person like slant, speed, line quality, alignment, etc. Samples are collected on two different surfaces; a table and a wall (smooth and rough surfaces). And on the basis of these two surfaces, the variations in the characteristics of the individual are observed. The significance of the research is to find out the range of natural variation that occurs in the individual handwriting whenever there is a change in the writing surface.

Evaluation of rRNA depletion methods for capturing the RNA virome from environmental surfaces

ObjectiveMetatranscriptomic analysis of RNA viromes on built-environment surfaces is hampered by low RNA yields and high abundance of rRNA. Therefore, we evaluated the quality of libraries, efficiency of rRNA depletion, and viral detection sensitivity using a mock community and a melamine-coated table surface RNA with levels below those required (< 5 ng) with a library preparation kit (NEBNext Ultra II Directional RNA Library Prep Kit).ResultsGood-quality RNA libraries were obtained from 0.1 ng of mock community and table surface RNA by changing the adapter concentration and number of PCR cycles. Differences in the target species of the rRNA depletion method affected the community composition and sensitivity of virus detection. The percentage of viral occupancy in two replicates was 0.259 and 0.290% in both human and bacterial rRNA-depleted samples, a 3.4 and 3.8-fold increase compared with that for only bacterial rRNA-depleted samples. Comparison of SARS-CoV-2 spiked-in human rRNA and bacterial rRNA-depleted samples suggested that more SARS-CoV-2 reads were detected in bacterial rRNA-depleted samples. We demonstrated that metatranscriptome analysis of RNA viromes is possible from RNA isolated from an indoor surface (representing a built-environment surface) using a standard library preparation kit.

Occurrence of hexabromocyclododecanes (HBCDs) and tetrabromobisphenol A (TBBPA) in indoor dust from different microenvironments: levels, profiles, and human exposure.

The levels and distributions of hexabromocyclododecane diastereoisomers (HBCDs) (including α, β, and γ-HBCD) and tetrabromobisphenol A (TBBPA) were investigated in indoor dust from bedrooms and offices. HBCDs diastereoisomers were the most abundant compounds in the dust samples, and the concentrations of ∑HBCDs in the bedrooms and offices ranged from 10.6 to 290.1ng/g and 17.6 to 1521.9ng/g, respectively. The concentrations of target compounds in the offices were generally higher than those in the bedrooms, probably due to the presence of more electrical equipment in the offices. In this study, highest levels of target compounds were all found in the electronics. In the bedrooms, the highest mean level of ∑HBCDs was found in air conditioning filter dust (118.57ng/g), while the personal computer table surface dust showed the peak mean concentrations of ∑HBCDs (290.74ng/g) and TBBPA (539.69ng/g) in the offices. Interestingly, a significantly positive correlation was observed between the concentrations of ∑HBCDs in windowsills and beddings dust in the bedrooms, suggesting beddings was one of the crucial sources of ∑HBCDs in the bedrooms. The high dust ingestion values of ∑HBCDs and TBBPA were 0.046 and 0.086ng/kgbw/day for adults, while 0.811 and 0.04ng/kgbw/day for toddlers, respectively. The high dermal exposure values of ∑HBCDs were 0.026 and 0.226ng/kgbw/day for adults and toddlers, respectively. Except for dust ingestion, other human exposure pathways (such as the dermal contact with beddings and furniture) should be paid attention.

USING ANTHROPOMETRIC DATA TO DESIGN A FORTABLE STUDY DESK AND USER POSTURE ANALYSIS WITH THE RAPPID UPPER LIMB ASSESSMENT (RULA) METHOD

The use portable study desk that is designed to be easy moved still make complaints in muscles and bones give risk for posture. Design improvements can be based on measurements results of static anthropometric and dynamic anthropometric to identify the risk of posture. The method used in this reaserch is a Rapid Upper Limb Assessment (RULA) method to analyze the risk of posture users of portable study desk, while for the design of study desk using anthropometric data, The purpose of this study was to design a portable study table and analyze the risk posture that occur when users use a portable study desk using the RULA method. The results of study show that design desk study using anthropometric data obtained dimensions of 800 mm in length and 420 mm in width. The table height from the floor to the table surface is 220 mm high. a place to put a D100 mm glass, and there is a place to put a 400 mm cell phone or iPad along with a hole for the cable, there is a Diameter 40 mm. The 2-dimensional and 3-dimensional design process uses Catia software. The results of the Rapid Upper Limb Assessment (RULA) analysis show that the user's posture risk is indicated in green color, which means that there is no posture that needs to be corrected and that posture is acceptable except for the posture muscles (muscles) which are are indicated red color so needed move as soon possible or muscle stretching, this is in line with Osha (2020) who states that static postures are recommended for stretching muscles to avoid muscle fatigue.

O hand, where art thou? Mapping hand location across the visual field during common activities

Humans employ visually-guided actions during a myriad of daily activities. These ubiquitous but precise manual actions rely on synergistic work between eye and hand movements. During this close cooperation between hands and eyes, the hands persist in sight in a way which is unevenly distributed across our visual field. One common assertion is that most hand actions occur in the lower visual field (LVF) because the arms are anatomically lower than the head, and objects typically rest on waist-high table surfaces. While experimental work has shown that humans are more efficient at reaching for and grasping targets located below their visual midline (Goodale and Danckert, Exp Brain Res 137:303–308, 2001), there is almost no empirical data detailing where the hands lie in the visual fields during natural hand actions. To build a comprehensive picture of hand location during natural visually guided manual actions, we analyzed data from a large-scale open-access dataset containing 100 h of non-scripted manual object interactions during domestic kitchen tasks filmed from a head-mounted camera. We found a clear vertical visual asymmetry with hands located in the lower visual scene (LVS) in more than 70% of image frames, particularly in ipsilateral space. These findings provide the first direct evidence for the established assumption that hands spend more time in the lower than in the upper visual field (UVF). Further work is required to determine whether this LVF asymmetry differs across the lifespan, in different professions, and in clinical populations.