Room Conditions Research Articles

Improvement of the clonal micro-propagation technology elements for raspberries of various fruiting types

The results of research on clonal micropropagation of 17 raspberry varieties of the Altai and European selection are presented. Recently, researchers have been focusing on creating a universal nutrient medium that would be equally suitable for any variety of a particular plant species. This is especially important for mass clonal micropropagation in production nurseries. The regeneration potential of the raspberry varieties of different types of fruiting at each stage of reproduction has been assessed. At the stage of actual micropropagation, it was found that Driver and Kuniyuki medium in our modification was superior to the Murashige and Skoog medium in terms of the shoot length and averaged 9.0 mm for common type varieties and 12.3 mm for remontant varieties. This made it possible to eliminate the additional stage of elongation of the microshoots. Also, the appearance of microshoots improved on the new medium. It was found that for raspberry, regardless of its type, the optimal concentrations of the growth regulators lie in the following range: cytokinin 6-benzylaminopurine (BAP) 2.5–3.5 μM together with auxin ß-indolyl butyric acid (IBA) 0.5–0.7 μM. At the stage of rhizogenesis, the best results were shown by the Driver and Kuniyuki medium with 2-fold reduced content of all main components and with the addition of 2.0 μM IBA at the passage duration of 21 days. After that, all microcuttings with and without roots underwent the adaptation stage – growth completion in neutral substrates for 56 days under ex vitro conditions in a vegetation room. In most cases, there were no statistically significant differences in the length and number of leaves regardless of the presence or absence of roots at the initial stage of adaptation. By the end of this stage, 100% of the adapted raspberry plants of the usual type of fruiting and 98% of the remontant type were obtained.

Validity of Acoustic Measures Obtained Using Various Recording Methods Including Smartphones With and Without Headset Microphones.

The goal of this study was to assess various recording methods, including combinations of high- versus low-cost microphones, recording interfaces, and smartphones in terms of their ability to produce commonly used time- and spectral-based voice measurements. Twenty-four vowel samples representing a diversity of voice quality deviations and severities from a wide age range of male and female speakers were played via a head-and-thorax model and recorded using a high-cost, research standard GRAS 40AF (GRAS Sound & Vibration) microphone and amplification system. Additional recordings were made using various combinations of headset microphones (AKG C555 L [AKG Acoustics GmbH], Shure SM35-XLR [Shure Incorporated], AVID AE-36 [AVID Products, Inc.]) and audio interfaces (Focusrite Scarlett 2i2 [Focusrite Audio Engineering Ltd.] and PC, Focusrite and smartphone, smartphone via a TRRS adapter), as well as smartphones direct (Apple iPhone 13 Pro, Google Pixel 6) using their built-in microphones. The effect of background noise from four different room conditions was also evaluated. Vowel samples were analyzed for measures of fundamental frequency, perturbation, cepstral peak prominence, and spectral tilt (low vs. high spectral ratio). Results show that a wide variety of recording methods, including smartphones with and without a low-cost headset microphone, can effectively track the wide range of acoustic characteristics in a diverse set of typical and disordered voice samples. Although significant differences in acoustic measures of voice may be observed, the presence of extremely strong correlations (rs > .90) with the recording standard implies a strong linear relationship between the results of different methods that may be used to predict and adjust any observed differences in measurement results. Because handheld smartphone distance and positioning may be highly variable when used in actual clinical recording situations, smartphone + a low-cost headset microphone is recommended as an affordable recording method that controls mouth-to-microphone distance and positioning and allows both hands to be available for manipulation of the smartphone device.

СРАВНИТЕЛЬНЫЕ ОЦЕНКИ ПЕРСПЕКТИВНЫХ КАПЕЛЬНЫХ ПОИЛОК ДЛЯ СЕЛЬСКОХОЗЯЙСТВЕННЫХ ПТИЦ

The problem of watering poultry with water is analyzed. The aim of the study is to choose the design of a nipple drinker for poultry when they are with cage kept. In accordance with this, in order to develop a modern nipple drinker for poultry that meets the sanitary and technical requirements of the poultry housing, a comparative analysis of existing nipple drinker designs is carried out. A nipple drinker for poultry of cage keeping is developed. The tests conducted on broilers show that the nipple drinker meets the physiological needs of poultry in water and is reliable in operation while reducing the cost of its preventive maintenance. The nipple drinker has a low water consumption during batch feeding, is hygienic in use, improves the sanitary condition of the poultry room, increases the live weight of broilers by 3...5%. The developed nipple drinker for poultry in comparison with its closest analogues has a simple design, low labor intensity of manufacture, the possibility of self-purification from salt deposits on the inner surface of the device regulating the flow of water, increases reliability in operation and reduces water losses by its portion supply, improves the sanitary condition of the room for keeping poultry.

Influence of humidity on the tribological performance of graphite reinforced aluminium anodic oxide coating

The effectiveness of graphite as self-lubricating reinforcement in anodic oxide is still unknown despite showing clear dependency towards water to provide lubrication. The objective of this study is to evaluate the tribological behavior of aluminium anodic oxide reinforced graphite coating under different relative humidity conditions. In this study, the oxide coating was reinforced with graphite varied between 0 to 20 gL−1. The graphite distribution, and structure hybridization were first analyzed. The coating with the highest sliding durability at room condition was tested under different relative humidity at 5 and 85 RH%. Overall, graphite reinforcement improved the coating’s hardness and roughness. Tribological wise, coating with 1 gL−1 of graphite reinforcement has the longest durability.

Low-temperature characterization of inkjet printed silver nanoparticles on polyimide substrate for the temperature range of −5°C to −75°C

Drop-on-demand inkjet printing is an additive manufacturing method capable of fabricating electronic devices using custom geometries at a relatively low cost. Drop-on-demand using silver nanoparticles has been extensively studied to produce devices and sensors that operate at room conditions. This work investigates the survivability and performance of inkjet-fabricated silver traces tested in an electric circuit at a subzero temperature environment from −5℃ to −75℃. Results show that printed Ag nanoparticles exhibit a similar thermal resistance coefficient compared to literature values of bulk nanostructured Silver at subzero temperatures, rendering this additive manufacturing technology a strong candidate for creating microelectronic devices for low-temperature aerospace applications.

Efficient 2-Nitrophenol determination based on ultra-sonochemically prepared low-dimensional Au-nanoparticles decorated ZnO-chitosan nanocomposites by linear sweep voltammetry

In this study, linear sweep voltammetry (LSV) was implemented for the sensitive detection of 2-nitrophenol (2-NP) in phosphate buffer solution (PBS) at pH 7.00 with lab-made nanocomposite materials for environmental remediation. Initially, a flat glassy carbon electrode (GCE) modified using the inorganic-organic binary Au-NPs@ZnO/CTSN(Chitosan) nanocomposites (NCs) was used as a working electrode (WE). The NCs of Au NPs@ZnO/CTSN were basically prepared by an ultra-sonochemical process and fabricated on a GCE using conducting coating binder such as PEDOT:PSS. Before the electrochemical examination, the Au NPs@ZnO/CTSN NC was fully characterized by Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), Energy-dispersive X-ray Spectroscopy (EDS), Brunauer-Emmett-Teller (BET), X-Ray Diffraction analysis (XRD), High-Resolution Transmission Electron Microscopy (HRTEM), and X-Ray Photoelectron Spectroscopy (XPS) to analyze the functional, morphological, structural, elemental, surface area, crystallinity, and binding energy analyses. A linear concentration range (LDR) of 2-NP from 15⁓150 μM was evaluated by LSV in room conditions. From the slope of the calibration curve, the sensor sensitivity was calculated and found to be 20.9905 μAμM−1cm−2. At signal/noise ratio of 3, the lower limit of detection (LOD) is obtained as 0.45 ± 0.023 μM. Additionally, pH optimization, sensor-probe characterization, stability, and validity are fully analyzed in identical conditions by LSV. Besides this, the assembled 2-NP sensor probe as Au NPs@ZnO/CTSN NCs/PEDOT:PSS/GCE for validity test was performed elaborately and found the reliable and satisfactory results. This is a new approach to the development of electrochemical sensors for environmental chemical analysis using an electrochemical process with gold-nanoparticle decorated ZnO-chitosan for the safety of environmental and healthcare fields on a broad scale.

Forage-cactus based edible coating, packaging, and refrigeration improve the visual and nutraceutical qualities of sweet potatoes

Sweet potatoes have high economic relevance in developing countries. Therefore, the adoption of post-harvest technologies for their conservation for long-distance markets is crucial. In this work, the effect of the combined use of cactus-based edible coating, packaging and refrigeration on the quality of sweet potatoes was evaluated. Four coating and packaging treatments were evaluated: (Control, Coating, Packaging, and Packaging + Coating) and seven storage periods (0, 7, and 14 days at 8 °C, and 17, 20, 23, and 26 days at 23 °C simulate refrigerated transport and shelf conditions respectively). Coating treatments consisted of immersion in 0.04 g L−1 of forage cactus mucilage + 300 mL L−1 glycerol for 1 min. After 14 days of cold storage, sweet potatoes were maintained at 23 °C for up to 26 days. Raw and cooked (microwaved for five minutes) sweet potato samples were evaluated at 0, 7, 14, 17, 20, 23, and 26 days. The refrigerated condition maintained sweet potato quality based on visual analysis for up to 14 days, regardless of the use of the edible coating. However, only packaged sweet potatoes, with or without coating, maintained higher visual scores after transfer to room conditions, exhibiting lower fresh weight loss up to 26 days. Sweet potatoes subjected only to edible coating maintained an acceptable visual appearance until 23 days. Additionally, firmness, visual analysis, DPPH and FRAP antioxidant activity, soluble phenolic and starch contents were more stable in raw and cooked sweet potatoes packaged (with or without coating) for up to 26 days, which is a sufficient time to reach more distant markets.

Synthesis of a cobalt catalyst supported by graphene oxide modified perlite and its application on the hydrolysis of sodium borohydride

In this work, a novel catalyst for the hydrolysis reaction of sodium borohydride to produce hydrogen—graphene oxide modified perlite supported cobalt—was produced. After being exposed to 98 % H2SO4, the natural mineral perlite was calcined and then mixed with graphene oxide. To create the Co@Perlite-GO catalyst, the synthesized Perlite-GO was added to the cobalt catalyst as a supporting material. The morphological layout and nature of the sample were evaluated using different spectroscopic techniques. Comparative analysis was carried out to investigate the catalytic effects of Co@Perlite-GO and Co@Perlite catalysts on the sodium borohydride (SBH) hydrolysis reaction. When the Co@Perlite-GO catalyst containing 4 mg Co was utilized, the hydrogen production rate was 12401 ml g−1 min−1 as a consequence of the optimization procedures carried out at 298 K. Under room conditions, the reaction occurred as catalyst control (0th degree), and the standard turnover frequency (TOF) was measured to be 8615 s−1. The activation energy, enthalpy, and entropy of the reaction were measured as 53.35 kJ mol−1, 50.77 kJ mol−1, and −58 J/(mol.K) respectively. It was found that the catalyst maintained 100 % efficiency even after being used six times.

‘Dissensus’ and the emergence of activist leadership in the baby room of UK early childhood settings

In the context of a chronically under-funded and fragmented Early Childhood Education and Care (ECEC) sector in England, there is an urgent need for models of leadership that emphasise action and advocacy. In the baby room, where pay, conditions and status are at their lowest, this is particularly the case. In this article, building on the model of activist leadership put forward by Woodrow and Busch, we consider ‘dissensus’ as a foundation for activist leadership among baby room leaders working in English nurseries. Dissensus is the willingness to express and explore differences, disagreements and tensions. In gathering the perspectives and experiences of 15 baby room leaders, we identified three threads of dissensus which we consider in this article: (1) the desire for baby room educators’ contributions to be recognised as more than ‘just care’, (2) feelings of resentment around being overlooked and undermined by ECEC colleagues outside of the baby room and (3) questions around pay and conditions in the baby room. We consider these threads of dissensus as a potential starting point for activist leadership in the baby room.

An innovative way to measure fatigue crack growth without COD gauge

While fatigue crack growth can be measured by the standard unloading compliance method, it requires a proper COD gauge and may not be applicable in harsh conditions, such as high temperature or corrosive environments. On the other hand, modern fatigue test machines have an accurate built-in sensor to measure the stroke position, representing the total system deflection within the load train. In this paper, an innovative method is proposed to determine specimen compliance accurately from the total system deflection data. This method can be used to measure the fatigue crack growth of standard specimens without a COD gauge or any other reference specimen. Each individual test specimen serves as a reference for determining the in-situ machine compliance. Therefore, the only prerequisite is exact information on the initial crack length and the elastic modulus of the specimen. Test results from three different materials demonstrated that the method works very successfully for fatigue crack growth tests under constant or decreasing peak load conditions. The methodology was successfully implemented in the development of an automatic pre-cracker for fracture mechanics specimens. Additionally, fatigue crack growth tests at high temperature were successfully conducted under normal test room conditions.

Vapor-induced phase-separation-enabled versatile direct ink writing

Versatile printing of polymers, metals, and composites always calls for simple, economic approaches. Here we present an approach to three-dimensional (3D) printing of polymeric, metallic, and composite materials at room conditions, based on the polymeric vapor-induced phase separation (VIPS) process. During VIPS 3D printing (VIPS-3DP), a dissolved polymer-based ink is deposited in an environment where nebulized non-solvent is present, inducing the low-volatility solvent to be extracted from the filament in a controllable manner due to its higher chemical affinity with the non-solvent used. The polymeric phase is hardened in situ as a result of the induced phase separation process. The low volatility of the solvent enables its reclamation after the printing process, significantly reducing its environmental footprint. We first demonstrate the use of VIPS-3DP for polymer printing, showcasing its potential in printing intricate structures. We further extend VIPS-3DP to the deposition of polymer-based metallic inks or composite powder-laden polymeric inks, which become metallic parts or composites after a thermal cycle is applied. Furthermore, spatially tunable porous structures and functionally graded parts are printed by using the printing path to set the inter-filament porosity as well as an inorganic space-holder as an intra-filament porogen.

Apigenin encapsulated in spray‐dried liposomes coated with chitosan: heat, pH, light, oxygen, salt and storage stability

SummaryApigenin (AP) is a natural flavonoid with multiple health benefits that can be used in functional foods. However, the hydrophobicity and poor aqueous solubility of AP have hindered its food application. With ethanol injection and spray drying, encapsulated AP in dried chitosan‐coated liposomes could be promising in delivering AP via foods. By comparing with the unencapsulated AP, this study examined the potential of spray‐dried chitosan‐coated apigenin liposomes (SCAL) in preserving the AP content and antioxidant capacity against food‐related heat, pH, light, oxygen and salt conditions. The moisture sorption isotherms and storage stability of SCAL were also investigated. The results show that the encapsulated AP in SCAL had better stability against pH (pH 2, pH 4, pH 6 and pH 7), light, oxygen and salt stress (0.1, 0.3 and 0.5 M NaCl) than the unencapsulated AP. The limits of relative humidity (RH) for SCAL storage were found to be <50% at 25 °C, <60% at 35 °C and <70% at 45 °C. SCAL could preserve AP over 90 days in room (86.55–95.42%) and chilled (91.54–95.79%) conditions. These findings suggest the potential of spray‐dried chitosan‐coated liposomes in improving the stability of AP, hence SCAL is promising for delivering AP in functional foods.

Analisis Penyebab Stres Pada Lansia Di Panti Sosial Tresna Werdha Budi Mulia 1 Cipayung Tahun 2023

There is an increase in stress among the elderly at the Tresna Werdha Budi Mulia 1 Cipayung Social Home in 2023. It is suspected that this stress is caused by several trigger factors including missing family, feeling abandoned, not feeling free, fear of the disease they are suffering from, and fear of death. which can have an impact on poor health. Objective: To find out the causes of stress in the elderly at the Tresna Werdha Budi Mulia 1 Cipayung Social Home in 2023. Method: In this research, researchers used a qualitative approach with a case study type of research with descriptive methods. Results: The cause of stress in the elderly is due to psychosocial changes. This is because seniors often lose their personal belongings, seniors' relationships with other seniors are less harmonious, and room conditions are less conducive, which makes seniors unable to sleep. Stress due to psychosocial changes is also caused by elderly people who no longer have families, divorce from their partners, lose loved ones forever, feel abandoned and abandoned. Conclusion: From this research it can be concluded that the cause of stress in the elderly at the Tresna Werdha Budi Mulia 1 Cipayung Social Home is due to psychosocial changes. This is caused by several factors such as loss of valuables, less harmonious relationships with the elderly, less conducive room conditions, no longer existing family, loss of loved ones forever, and abandonment.

Fracture Toughness Investigation of AL6082-T651 Alloy under Corrosive Environmental Conditions

The crack initiation and propagation in an aluminium alloy in a corrosive environment are complex because of the loading parameters and material properties, which may result in a sudden failure in real-time applications. This paper investigates the fracture toughness of aluminium alloy under varying environmental and corrosion conditions. The main objective of the work is to link the interdependencies of humidity and temperature for an AL6082-T651 alloy in a corrosive environment. This study investigates AL6082-T651alloy's fracture behaviour and mechanism through microstructure and fractographic studies. The results show that a non-corroded sample, at room conditions, provided more load-carrying capacity than a corroded sample. Additionally, an increase in temperature improves fracture toughness, while an increase in humidity results in a decrease in fracture toughness.

The effect of fingerprint enhancement methods applied on adhesive surfaces on DNA recovery: a preliminary study

The presence of body fluids such as blood, saliva, semen or urine during fingerprint research on the evidence taken from the crime scene makes it necessary to protect biological materials to examine the evidence in multiple ways. Therefore, it is crucial that fingerprint development (FD) techniques do not disrupt the structure of biological materials during FD procedures. In this sense, it is essential to determine whether biological material or fingerprints should be the priority during the collection of evidentiary materials, to determine the systematic order and to determine whether the FD methods to be applied cause damage to the genetic material used in the identification of individuals and to evaluate them in terms of their evidentiary quality. This study investigated the effects of the application of trace detection methods on DNA profiling processes in evidence where fingerprints and biological samples are found at the same time. In this study, blood, saliva, semen and urine samples were taken from a male individual who signed an informed consent form at the laboratory stage. The samples were applied 50 µL on the adhesive tape surface. After application, the samples were treated with crystal violet (CV) and sticky side (SS) fingerprint development chemicals suitable for the surface type. The prepared samples were dried under room conditions. After 1 day and 45 days under normal room conditions, silica-based DNA extraction was performed. After extraction, DNA quantification was performed using the fluorimetry method. In the study, biological samples with known DNA content were used to focus on DNA quantification. Among the fresh samples prepared in the study, DNA recovery was higher in the SS-treated urine, blood and saliva samples and in the CV-treated semen sample group compared to the other groups. This shows that chemical treatment of some biological samples on adhesive tape increases the efficiency of DNA recovery. When the 45-day waiting samples were compared with the control group samples, DNA recovery decreased in CV-treated urine and blood samples, while DNA recovery increased in SS-treated urine and blood samples. In semen samples, both CV and SS treatment negatively affected DNA recovery. In saliva samples, DNA recovery increased ~2-fold in the CV-treated sample group, while SS treatment caused a ~75% decrease in DNA recovery. The results show that the non-porous adhesive tape does not adversely affect the amount of DNA in terms of STR profiling of latent FD chemicals used on the surfaces and that adhesive tape treated with fingerprint enhancement chemicals can actually be used for advanced forensic genetic analyses for DNA extraction on surfaces.

Comparative study on the impact of storage conditions on ESR signals in fingernail dosimetry

Human fingernails in combination with electron spin/paramagnetic resonance (ESR/EPR; hereafter “ESR”) spectroscopy have high potential as an individual dosimetry tool in radiological accidents. For the practical realization of this technique, it is necessary to reduce the uncertainty due to the instability of ESR signals affected by both individual and environmental factors. In the present study, we examined the effects of different storage conditions (in a laboratory room, refrigerator, freezer, and vacuum) and prior sample treatment on the intensity and stability of ESR signals from the fingernails of a child, which has not been investigated in previous studies, in comparison with those of an adult. Fingernail samples collected from a 10 y/o female child and a 37 y/o male adult were irradiated with 160 kV X-rays at 10 Gy, and the time changes of radiation-induced ESR signal (RIS) and background signal (BKG) under different conditions were measured for up to 30 days. As results, the ESR signal intensities (peak-to-peak amplitudes) of both child and adult fingernails were the most stable under freezing conditions, while the intensities of both RIS and BKG of fingernails were notably higher and more stable in the child samples than in the adult samples. In addition, the child samples showed a better response to the prior treatment using ethanol and water; BKG faded significantly after treatment despite the original higher background. Further investigations with more samples from donors of different ages are needed to clarify and reduce inter- and intra-individual variability in the dosimetric properties of human fingernails.

Exploring the influence of indoor environment and spatial layout on changed behaviours of people with dementia in a nursing home

People with dementia sometimes show changed behaviours such as agitation, hallucination, and wandering during the moderate and severe dementia stages. In addition to individual health factors, contextual factors, such as indoor environment conditions, spatial layout, and human activities, may trigger or influence these behaviours, but there is a lack of solid evidence. We used mixed methods to collect data, including the fly-on-the-wall method to observe the residents' daily lives and deploying environmental sensors to monitor the indoor environments of two central living rooms and ten bedrooms in a nursing home in the Netherlands. A data collection campaign from August to September 2022 focused on the indoor environmental parameters, ventilation control of monitored rooms, the observation of ten participants' locations, activities, clothing levels, and changed behaviours. The data were analysed using Fisher's exact tests and heatmap analysis. The results show that even though the nursing home was well maintained according to existing indoor environmental quality standards, the room conditions of temperature, TVOC, and HCHO levels and contextual factors (main activity and numbers of people in the space) were significantly correlated with locations of changed behaviours. By analysing observation data with spatial layout, participants had larger activity ranges on the days that exhibited changed behaviours than those without. Most of these behaviours were observed at the edge of common spaces, where caregivers need to pay more attention.

EFFICIENT CLONAL PROPAGATION OF GUAVA CULTIVARS BY MINI SOFTWOOD CUTTINGS

Guava (Psidium guajava L.) is commercially propagated by seeds in Punjab and vegetative propagation systems are lacking. Propagation by stem cuttings is handicapped by the non-availability of plant material in bulk for cuttings and season dependency. Hence, juvenile mini softwood (MSW) shoot cuttings (3"-4") of Gola (Round) cultivar having two to three nodes were treated with plant growth regulators (PGRs) including indole butyric acid ‘IBA’ or naphthalene acetic acid ‘NAA’ in combinations with benzyl aminopurine ‘BAP’ and planted in sand, silt and coco peat (40:40:20 v/v) under CRD layout for PGR optimization. Cuttings treated with BAP and IBA (2 mgL-1 + 3 mgL-1) started early sprouting in 8 days and induced a greater number of branches (5-6), number of leaves (11), number of roots (6-7) and long roots (14 cm). Whereas, sprout length was higher up to 14 cm in cuttings treated with BAP and IBA (3 mgL-1 + 1 mgL-1). In the second part of the study, application of the optimized PGR treatment of BAP and IBA (2 mgL-1 + 3 mgL-1) to MSW cuttings of different commercial strains of cultivars Gola (Round) and Surahi (Pyriform) showed a better number of roots (5, 4), root length (13 cm, 11 cm), bud sprouting (100% and 80%) and number of nodes (5 each) in Gola (Sadabahar ‘G1’) and Surahi (Sindhi Bao ‘S2’), respectively. The rooted cuttings were maintained under standard growth room conditions and higher humidity till proper plant growth and the established plantlets were transferred to green house. This study established an efficient clonal propagation system using MSW cuttings thus reducing the plant material and PGRs required for mass multiplication of elite guava cultivars. Keywords: Auxin, cytokinin, softwood cuttings, shoot, rooting.

Analysis of the Mechanical Degradability of Biodegradable Polymer-Based Bags in Different Environments

Biodegradable polymer-based bags were developed as an alternative to plastic. However, their degradation in environmental conditions has not been fully investigated and is often incomplete. Here, the decomposition of three types of biodegradable bags and one type of plastic bag in different types of environments was analyzed. Polymer bags were exposed for six weeks in water, soil, air and compost, while the control groups were stored in room conditions. All types of polymer bags were sampled twice (after 3 and 6 weeks), and different parameters of changes in physical–mechanical properties were measured. The research established significant differences in changes in mechanical properties between different types of biodegradable polymer bags, with ‘white’ and ‘brown’ bags showing the best decomposition potential. As expected, the largest change in the structure and physical–mechanical properties of all types of polymer bags was recorded in compost, and the smallest in air and water.

Implications of the storage conditions and production system on the physical properties of eggs: a multivariate data analysis study

SummaryThe objective of this study was to apply multivariate data analytical methods to evaluate the effect of both storage conditions (cold and room temperature) and production systems (cage and free range) on the physical properties of chicken eggs produced under tropical conditions. The results of this study indicated that most of the physical quality parameters (Haugh units, egg weight, albumin height, yolk colour, shell breaking and shell thickness) measured in the egg samples stored at room temperature (RT) were lower compared with egg samples stored in cold room (CT) conditions. The weight loss rate (WLR) was higher in the egg samples from RT compared with CT conditions. Both egg samples from either CT storage conditions or FR production system had the best quality parameters (high Haugh units, heavy egg weights and low WLR). The highest classification rate using linear discriminant analysis was obtained for the prediction of systems of production where egg samples from cage (C) and FR were 83% and 80% correctly classified. However, the classification of weeks of storage provides with intermediate classification results based on the physical parameters measured where 75% and 72% of the samples were correctly classified as stored in CT or RT storage conditions, respectively. The utilisation of multivariate data analysis allowed for the analysis of all the variables at the time without the need to isolate effects such as birds age, housing systems or by the solely interpretation of a single parameter.