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Fulltext A review of maturation diets for mud crab genus Scylla broodstock: Present research, problems and future perspective

Azra MN, Ikhwanuddin M

Saudi J Biol Sci, 2016 Mar;23(2):257-67.
PMID: 26981008 DOI: 10.1016/j.sjbs.2015.03.011

Study of broodstock maturation diets is important in order to increase the quality of berried females, which indirectly improve the larval quantity in the hatchery production of cultured species. This paper reviewed the studies on the maturation diets for mud crab broodstock, genus Scylla and compared independently to identify their effect on reproductive performance and larval quality. The broodstock is usually caught from the wild and held in the spawning or maturation tank for further use of hatchery seed production. Mud crab broodstock was fed either natural diet, artificial diet or mixed diet. Trash fishes were commonly used as a natural feed for mud crab broodstock; meanwhile artificial diets are from formulated fish meal and various kinds of feed. The results indicated that mud crab broodstock has a high dietary requirement for lipids, fatty acids and protein which are to be used during the maturation and breeding processes. However, the natural diet produce better larval quality compared to the artificial diet. The mixed diet is the better diet which resulted in better reproductive performances such as growth, survival, fecundity and maturation processes. This review also discusses the problems in the previous studies for the potential future research to develop very high quality and cost-effective formulated diet for the enhancement of broodstock and seed production technology. Information from this review can be useful in developing a better quality of crustacean broodstock's diet for commercial hatchery production.
Fulltext Aquaculture Production and Value Chains in the COVID-19 Pandemic

Ahmed N, Azra MN

Curr Environ Health Rep, 2022 Sep;9(3):423-435.
PMID: 35713850 DOI: 10.1007/s40572-022-00364-6

PURPOSE OF REVIEW: The purpose of this review is to summarize the impacts of the coronavirus disease 2019 (COVID-19) pandemic on aquaculture input supply, production, distribution, and consumption.
RECENT FINDINGS: The COVID-19 pandemic-related lockdowns, social distancing, supply chain disruptions, and transport restrictions affect seafood production, distribution, marketing, and consumption. Recommendations are suggested to overcome these challenges. The COVID-19 has led to disruption of aquaculture practices worldwide. The pandemic has adversely affected the aquaculture input supply of fish stocking and feeding, which, in turn, has impacted aquaculture production. Moreover, the COVID-19 crisis has had adverse effects on value addition to aquaculture products, through the restrictions of seafood marketing and exporting. Aquatic food production is vulnerable to the effects of COVID-19 outbreak; hence, adaptation strategies must be developed to cope with the challenges. There is an urgent need for collaboration among key stakeholders to rebuild the supply chain of inputs and fish marketing for sustainable aquaculture practices. International agencies, donors, government and non-governmental organizations, researchers, and policymakers need to develop policies to support aquaculture production and supply chains.
Fulltext Data on the molting duration and time of hardening of instar crab at different culture temperatures

Ikhwanuddin M, Abol-Munafi AB, Azra MN

Data Brief, 2019 Aug;25:104196.
PMID: 31321277 DOI: 10.1016/j.dib.2019.104196

This data article includes raw and analyze data for molting duration and time of hardening of blue swimming crab, Portunus pelagicus instar at three different temperatures of 24 °C, 28 °C, and 32 °C. Two sets of experimental data are included: first, the recorded on time-lapse video of duration of successful molted crabs (from emergence of swimming legs to chelae); and second, the time interval of shell hardening up to before molting occurred. Shell hardening were calculated in 1 h interval with a unit of x hour molting crab-1, meanwhile the molting duration of the crabs were calculated in x second molting crab-1. Video files were then analyzed using the latest version of Solomon Coder software developed by A. Peter. Relationship between culture temperature and the time of molting and carapace hardening are also included in this article. The dataset is made publicly available to enable critical or extended analyzes.
Fulltext Behavioural data on instar crab movement at different thermal acclimation

Azra MN, Ikhwanuddin M, Abol-Munafi AB

Data Brief, 2019 Feb;22:998-1002.
PMID: 30740484 DOI: 10.1016/j.dib.2019.01.026

This article investigated how crabs responded to different culture temperatures especially dislocation before molting using a combination of large recording files and computer software. In this novel approach of video recording portunid crab behavioral data, crab culture was recorded at five different acclimation temperatures of 20, 24, 28, 32 and 36 °C. Crabs were reared until the instar stage before being acclimatized for video recording. Large video files (MPEG-TS) were then analyzed using the latest version of Solomon Coder software developed by A. Peter and programmed with Embarcadero® Delphi® XE [1]. Recorded data was analyzed by calculating and marking movements of crabs using the time sequence tool. Additionally, a total movement was counted 30 min before crabs molted from instar stage 8 to instar stage 9. Part of the data is associated with the research article "Thermal tolerance and locomotor activity of blue swimmer crab Portunus pelagicus instar reared at different temperatures" (Azra et al., 2018) [2] and provided here as raw data of Supplementary materials.
Fulltext Clinical reasoning training sessions for health educators-A scoping review

Mohd Tambeh SN, Yaman MN

J Taibah Univ Med Sci, 2023 Dec;18(6):1480-1492.
PMID: 37434867 DOI: 10.1016/j.jtumed.2023.06.002

OBJECTIVES: Clinical reasoning (CR) is important in health professions, because it ensures patient safety and decreases morbidity. CR should be introduced early in medical school. Health educators play a major role in advocating for the use of CR among students; however, educators themselves can be a barrier to the incorporation of CR; consequently, CR training sessions for educators have been proposed as a potential solution. This scoping review was conducted to highlight studies on CR training among health educators.
METHODS: A scoping review was performed to identify studies on CR training sessions for health educators. PubMed, SciVerse Scopus, Web of Science Core Collection, EBSCO Medline Complete and ERIC databases were searched with terms including clinical reasoning, diagnostic reasoning, teacher and trainer, to identify articles published between 1991 and 2021.
RESULTS: The initial search yielded 6587 articles; after careful selection, n = 12 articles were included in this scoping review. Most CR training sessions were in the medical field, were conducted in North America, and involved clinical educators. The sessions focused on the fundamentals and steps of CR; biases and debiasing strategies; and learners' difficulties with various teaching formats, such as didactic presentations, facilitated small group sessions with case discussions, roleplay, and use of tools and a mobile application. Educators and students had positive perceptions regarding the conduct and effectiveness of the training sessions.
CONCLUSIONS: These training sessions were rated highly; however, longitudinal feedback regarding the application of learnt CR teaching strategies is necessary.
Fulltext Developing an index based on GIS and statistical analysis for family support of substance abuser in Terengganu

Juahir, H., Fazillah, A., Kamarudin, M.K.A., Toriman, E., Mohamad, N., Fairuz, A., et al.

Malaysian Journal of Applied Sciences, 2018;2(2):45-54.
MyJurnal

Family support has a strong impact on individuals and there is no exception in substance abuse
recovery process. Family support manages to play a positive role in substance abuse problems. The
present study deals with the developing model of family support substance abuser with the
combination method of Geographic Information System (GIS) and statistical models. The data used
for this study was collected from seven districts in Terengganu with a constant number of
respondents. 35 respondents for each district were involved in this study. It was then processed using
factor analysis (FA) to develop index of family support. By using the developed indices, GIS tool was
used to plot the distribution map of family support indices according to each form of family support.
The result indicated that the highest index for all form of family support abuser was located in Besut
district. High level of family support is essential as an effort for rehabilitation process of substance
abusers.
Testis maturation stages of mud crab (scylla olivacea) broodstock on different diets

Ghazali Azmie, Mohamad N. Azra, Mhd Ikhwanuddin, Siti Fatimah Nahar, Wendy Wee, Ambok-Bolong Abol-Munaf

Sains Malaysiana, 2018;47:427-432.

The aim of this study was to investigate how various diets influence testis maturation stages in mud crab (Scylla olivacea)
broodstock. Morphological and histological assessments were performed in triplicate (10 male crabs each). Daily,
subject crabs were fed a squid (Loligo sp.) and a fish (Decapterus sp.) diet at 5-10% of body weight. Diets were analyzed
following methods from the Association of Analytical Communities (AOAC). In comparison to control (wild) crabs, the
two diets generally did not cause significant differences (p>0.05) in body weight, carapace width and gonadosomatic
index (GSI), except in the GSI of squid-fed crabs (p<0.05). At the end of the experiment, crabs that reached Stage 3 testis
maturation included were 6 fish-fed individuals and 23 squid-fed individuals. Additionally, differences in crude protein
and fat levels across diets influenced the nature of male gonadal development. In conclusion, a squid diet was sufficient
to induce Stage 3 testis maturation in Scylla olivacea within 60 days of culture. Our results prove the usefulness in
developing appropriate feeding regimes for male Scylla olivacea broodstock.
Fulltext Influence of container design on predation rate of potential biocontrol agent, Toxorhynchites splendens (Diptera: Culicidae) against dengue vector

Mohamad N, Zuharah WF

Trop Biomed, 2014 Mar;31(1):166-73.
PMID: 24862057 MyJurnal

Toxorhynchites splendens larvae are a natural predator of dengue vector mosquito larvae, Aedes albopictus. This study was carried out to evaluate the predation rate of Tx. splendens third instar larvae on Ae. albopictus larvae in 24 h. Each predator was offered prey at a density between 10 to 50 individuals. Predation rate of Tx. splendens were also tested with two manipulated factors; various types of container and different water volumes. The experiment was evaluated in man-made containers (tin cans, plastic drinking glasses and rubber tires) and natural container (bamboo stumps) which were filled with different water volumes (full, half full, 1/4 full, and 1/8 full). The prey density and the characteristics of the container were found as significant factors which influence the predation rate of Tx. splendens. The predator consumed significantly more prey at higher prey densities (40 and 50 preys) compared to the lowest density (10 preys) (F=3.935, df=4, p=0.008). The results showed significantly higher consumption in horizontal shaped container of rubber tire than in vertical shape of bamboo stumps (F=3.100, df=3, p=0.029). However, the water volume had no significant effect on predation rate of Tx. splendens (F=1.736, df=3, p=0.162). We generally suggest that Tx. splendens is best to be released in discarded tires or any other containers with horizontal shape design with wide opening since Tx. splendens can become more effective in searching prey in this type of container design. This predator is also a suitable biocontrol candidates to be introduced either in wet and dry seasons in Malaysia.
Fulltext Cable theft monitoring system (CTMS) using GSM modem

Mohd Chachuli, S. A., Mohd Nazri, S., Yusop, N., Mohamad, N. R.

Journal of Advanced Research in Applied Sciences and Engineering Technology, 2016;2(1):57-66.
MyJurnal

This system is developed to help in reducing the number of cable theft activities.
Currently, various methods have been applied by many companies to overcome this problem however
cable theft activities were still occurred. Thus, a new system based on simple method is proposed in
this paper to overcome these problems. The main objective of this project is to design and develop a
cable theft monitoring system (CTMS) using GSM Modem. The main parts for this system are
Peripheral Interface Controller (PIC) 16F877A microcontroller, voltage divider and temperature
sensor. From the experimental results, it showed that CTMS able to detect the voltage drop and
temperature changed with 99% of efficiency. This system is expected to enhance the capability of
existing system in term of compatibility. With significant improved in range and reliable data
accuracy in real time, this project promise a bright future to develop in reducing cable theft activities.
Copyright © 2016 Penerbit Akademia Baru - All rights reserved
Ovarian maturation stages of wild and captive mud crab, scylla olivacea fed with two diets

Azmie Ghazali, Noordiyana Mat Noordin, Ambok Bolong Abol-munafi, Mohamad N. Azra, Mhd Ikhwanuddin

Sains Malaysiana, 2017;46:2273-2280.

This study was aimed to determine the ovarian maturation stages of wild and captive orange mud crab, Scylla olivacea fed with different diets via gonadosomatic status, oocyte diameter and histological examinations. Captive crabs were fed with blood cockle, Anadara granosa, or fish, Decapterus spp. Through the histological examinations, ovarian maturation stages of wild and captive S. olivaceawas classified into four stages: Immature (Stage 1), Early maturing (Stage 2), Pre-maturing (Stage 3) and Fully matured (Stage 4). Gonadosomatic Index of wild and captive crabs remained low during immature and 2 but increased significantly (p<0.05) in pre-maturing and 4 ovaries. Oocytes size were significantly different (p<0.05) in all ovarian maturation stages of wild and captive crabs. Follicle cells surround the oocyte of immature ovary and small yolk globules start to appear in early maturing ovary with large nucleus size. Oocyte size increased significantly (p<0.05) and yolk globule obviously appeared in pre-maturing ovary. Large and fused yolk globules appeared in the oocytes of fully matured ovary with nucleus was barely visible. The present study revealed that, ovarian maturation stages of S. olivacea are closely related to its morphological appearance and cellular development.
Reviewing the molecular mechanisms which increase endometrial cancer (EC) risk in women with polycystic ovarian syndrome (PCOS): time for paradigm shift?

Shafiee MN, Chapman C, Barrett D, Abu J, Atiomo W

Gynecol Oncol, 2013 Nov;131(2):489-92.
PMID: 23822891 DOI: 10.1016/j.ygyno.2013.06.032

Endometrial cancer (EC) is the commonest gynaecological cancer in North American and European women. Even though it has been shown that women with polycystic ovary syndrome (PCOS) have a three-fold increase in the risk of developing EC compared to women without PCOS, the precise molecular mechanisms which increase EC risk in women with PCOS remain unclear. Clinical strategies to prevent EC in PCOS are therefore not well researched and understood. Although raised estrogen levels, hyperinsulinaemia and, reduced apoptosis have been suggested as potential mechanisms, there is a lack of clarity about how these factors and other factors may interact to increase EC risk in PCOS. This article reviews the literature, on the potential molecular links between PCOS and EC but argues for a paradigm shift, to a systems biology-based approach in future research into the molecular links between PCOS and EC. The potential challenges of a systems biology-based approach are outlined but not considered insurmountable.
Thermal tolerance and locomotor activity of blue swimmer crab Portunus pelagicus instar reared at different temperatures

Azra MN, Chen JC, Ikhwanuddin M, Abol-Munafi AB

J Therm Biol, 2018 May;74:234-240.
PMID: 29801633 DOI: 10.1016/j.jtherbio.2018.04.002

Owing to its potential market value, the blue swimmer crab Portunus pelagicus is of great economic importance. The temperature of water significantly affects the physiological function and production efficiency of these crabs. The aim of the present study was therefore to examine the critical thermal minimum (CTMin), critical thermal maximum (CTMax), acclimation response ratio (ARR), escaping temperature (Tesc), and locomotor behavior of P. pelagicus instars at 20 °C, 24 °C, 28 °C, 32 °C, and 36 °C. The CTMax ranged from 39.05 °C to 44.38 °C, while the CTMin ranged from 13.05 °C to 19.30 °C, and both increased directly with temperature. The ARR ranged from 0.25 to 0.51. The movement of crabs (walking before molting) correlated positively with the acclimation temperature. These results indicate that the parameters evaluated varied with temperature. Furthermore, the high CTMax indicates the potential of this species to adapt to a wide range of temperatures. In addition, the implications of these findings for portunid crabs behavior and distribution in their natural habitat are also discussed.
Dataset on body weight, carapace width increment and growth band count of mud crabs, Scylla olivacea

Ikhwanuddin M, Amin-Safwan A, Hasyima-Ismail N, Azra MN

Data Brief, 2019 Oct;26:104477.
PMID: 31667242 DOI: 10.1016/j.dib.2019.104477

The present paper contains two datasets; i) the growth band count (GBC) of mud crab, Scylla olivacea collected from Setiu Wetlands, Terengganu coastal water, East coast of Peninsular Malaysia and ii) the increment sizes of body weight (BW) and carapace width (CW) of immature S. olivace after molting. The datasets presented here were associated with the research articles entitled i) "Study on carapace width growth band counts relationship of orange mud crab, S. olivacea (Herbst, 1796) from Terengganu Coastal Waters, Malaysia" (Hasyima-Ismail et al. 2017) [1] and ii) "Relationship between the carapace width and body weight increments and the confirmation of Stage 1 ovary after the molting of immature orange mud crabs, S. olivacea (Herbst, 1796), in captivity" (Amin-Safwan et al. 2019-2020) [2], and provided here as raw data of Supplementary materials. Raw datasets for GBC in the wild were generated by examination of the thin cross sectioning process of the gastric mill of S. olivacea. The GBC were measured for each individual crab wherein band counts ranged from 1 to 3. The analysis provides evidence that the GBC of the crabs can be determined through both mesocardiac and zygocardiac ossicles. This data is of importance to researchers for estimation of stock assessment and improvement of fisheries management to further improve policy. For the BW-CW increment data, a total of 135 immature crabs were sampled from Setiu Wetlands, Terengganu, Malaysia, and were introduced to limb autotomy technique in order to induced molt. Crabs were reared until successful molting and immediately prior to hardened shell, before final measurement of body weight and carapace width determination. Recorded data was analyzed by calculating the increment sizes, along with correlation and regression analysis between body weight and carapace width of mud crabs.
Fulltext The Influences of Emotion on Learning and Memory

Tyng CM, Amin HU, Saad MNM, Malik AS

Front Psychol, 2017;8:1454.
PMID: 28883804 DOI: 10.3389/fpsyg.2017.01454

Emotion has a substantial influence on the cognitive processes in humans, including perception, attention, learning, memory, reasoning, and problem solving. Emotion has a particularly strong influence on attention, especially modulating the selectivity of attention as well as motivating action and behavior. This attentional and executive control is intimately linked to learning processes, as intrinsically limited attentional capacities are better focused on relevant information. Emotion also facilitates encoding and helps retrieval of information efficiently. However, the effects of emotion on learning and memory are not always univalent, as studies have reported that emotion either enhances or impairs learning and long-term memory (LTM) retention, depending on a range of factors. Recent neuroimaging findings have indicated that the amygdala and prefrontal cortex cooperate with the medial temporal lobe in an integrated manner that affords (i) the amygdala modulating memory consolidation; (ii) the prefrontal cortex mediating memory encoding and formation; and (iii) the hippocampus for successful learning and LTM retention. We also review the nested hierarchies of circular emotional control and cognitive regulation (bottom-up and top-down influences) within the brain to achieve optimal integration of emotional and cognitive processing. This review highlights a basic evolutionary approach to emotion to understand the effects of emotion on learning and memory and the functional roles played by various brain regions and their mutual interactions in relation to emotional processing. We also summarize the current state of knowledge on the impact of emotion on memory and map implications for educational settings. In addition to elucidating the memory-enhancing effects of emotion, neuroimaging findings extend our understanding of emotional influences on learning and memory processes; this knowledge may be useful for the design of effective educational curricula to provide a conducive learning environment for both traditional "live" learning in classrooms and "virtual" learning through online-based educational technologies.
Fulltext Acceptability of epidural analgesia for pain relief during labour among Kelantanese women

Sharma S, Mohamad NA, Monga D, Achana S

Med J Malaysia, 1996 Dec;51(4):453-6.
PMID: 10968033

Three hundred and five primigravid women were interviewed at term to assess the acceptability of epidural during labour, and reasons for the decisions. Data was collected on a prestructured proforma which consisted of background information, socio-economic status, knowledge about epidural analgesia, source of information and reasons for choice. Of the 305 patients only 17.3% were willing to receive epidural analgesia. This group consisted of 56.6% non-Malay women. Those employed in professional or skilled jobs (56.6%) also readily consented for epidural. Nearly half the women willing for epidural had received college (tertiary) education (43.3%) and more than a quarter (26.4%) were over 30 years of age. The majority of those who were unwilling had no prior knowledge about the procedure, and refused either out of fear, ignorance, resistance from husbands, on religious grounds or following poor feedback from friends. In order to advocate epidural analgesia, knowledge has to be targeted to the relatively less educated, unemployed women, mainly through the media or personally in the antenatal clinic by doctors and nurses. Services have to be improved as substandard analgesia may send out wrong messages and actually do more harm than good.
Source apportionment and health risk assessment of PM10 in a naturally ventilated school in a tropical environment

Mohamad N, Latif MT, Khan MF

Ecotoxicol Environ Saf, 2016 Feb;124:351-362.
PMID: 26590697 DOI: 10.1016/j.ecoenv.2015.11.002

This study aimed to investigate the chemical composition and potential sources of PM10 as well as assess the potential health hazards it posed to school children. PM10 samples were taken from classrooms at a school in Kuala Lumpur's city centre (S1) and one in the suburban city of Putrajaya (S2) over a period of eight hours using a low volume sampler (LVS). The composition of the major ions and trace metals in PM10 were then analysed using ion chromatography (IC) and inductively coupled plasma-mass spectrometry (ICP-MS), respectively. The results showed that the average PM10 concentration inside the classroom at the city centre school (82µg/m(3)) was higher than that from the suburban school (77µg/m(3)). Principal component analysis-absolute principal component scores (PCA-APCS) revealed that road dust was the major source of indoor PM10 at both school in the city centre (36%) and the suburban location (55%). The total hazard quotient (HQ) calculated, based on the formula suggested by the United States Environmental Protection Agency (USEPA), was found to be slightly higher than the acceptable level of 1, indicating that inhalation exposure to particle-bound non-carcinogenic metals of PM10, particularly Cr exposure by children and adults occupying the school environment, was far from negligible.
Fulltext Whole-Genome Sequence of Quorum-Sensing Vibrio tubiashii Strain T33

Izzati Mohamad N, Yin WF, Chan KG

Genome Announc, 2015;3(1).
PMID: 25555738 DOI: 10.1128/genomeA.01362-14

Vibrio tubiashii strain T33 was isolated from the coastal waters of Morib, Malaysia, and was shown to possess quorum-sensing activity similar to that of its famous relative Vibrio fischeri. Here, the assembly and annotation of its genome are presented.
Fulltext Haplotypes frequencies of CYP2B6 in Malaysia

Musa N, Zulkafli MI, Talib N, Mohamad N, Fauzi H, Ismail R

J Postgrad Med, 2012 Oct-Dec;58(4):235-41.
PMID: 23298916 DOI: 10.4103/0022-3859.105439

Drugs with complex pharmacology are used in the management of drug use disorder (DUD) and HIV/AIDS in Malaysia and in parts of South-East Asia. Their multiethnic populations suggest complexity due to the genetic polymorphism, such as CYP2B6 that metabolizes methadone and anti-retroviral.
Fulltext The consequences of tinnitus and tinnitus severity on cognition: A review of the behavioural evidence

Mohamad N, Hoare DJ, Hall DA

Hear Res, 2016 Feb;332:199-209.
PMID: 26523370 DOI: 10.1016/j.heares.2015.10.001

People with tinnitus report anecdotal difficulties in mental concentration and psychological treatments for tinnitus advise on concentration difficulties and how to manage them. Yet the literature lacks any coherent discussion about what precise theoretical cognitive constructs might be mediating reported concentration problems. This review addresses this gap by describing and critically appraising the behavioural evidence for the effects of tinnitus on cognitive performance (namely working memory and attention). Empirical evidence is somewhat limited, but there is some support that tinnitus interferes with executive attention, and mixed support that it impairs working memory and selective attention. We highlight a number of methodological considerations to help drive the field forward and we propose a putative model of the complex inter-relationships between tinnitus, cognition and confounding factors. This model provides a basis for hypothesis testing.
Bacterial cellulose/acrylamide pH-sensitive smart hydrogel: development, characterization, and toxicity studies in ICR mice model

Pandey M, Mohamad N, Amin MC

Mol Pharm, 2014 Oct 6;11(10):3596-608.
PMID: 25157890 DOI: 10.1021/mp500337r

The objective of this study is to synthesize and evaluate acute toxicity of the bacterial cellulose (BC)/acrylamide (Am) hydrogels as noncytotoxic and biocompatible oral drug delivery vehicles. A novel series of solubilized BC/Am hydrogels were synthesized using a microwave irradiation method. The hydrogels were characterized by Fourier transform infrared spectroscopy (FTIR), swelling ratio, porosity, drug release, and in vitro and in vivo biocompatibility experiments. FTIR spectra revealed that the BC crystallinity and gel fraction decreased as the NaOH concentration increased from 2% to 10% w/v, whereas the optical transparency, pH sensitivity, and porosity were enhanced with increasing alkali concentration. Theophylline was used as a model drug for drug loading and release studies. The percentage of drug released was higher at pH 7.4 compared to pH 1.5. In vitro cytotoxicity and hemolytic tests indicated that the BC/Am hydrogel is noncytotoxic and hemocompatible. Results of acute oral toxicity tests on ICR mice suggested that the hydrogels are nontoxic up to 2000 mg/kg when administered orally, as no toxic response or histopathological changes were observed in comparison to control mice. The results of this study demonstrated that the pH-sensitive smart hydrogel makes it a possible safe carrier for oral drug delivery.

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