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  1. Article ; Online: Insights into the COVID-19 pandemic: Origin, pathogenesis, diagnosis, and therapeutic interventions.

    Berekaa, Mahmoud M

    Frontiers in bioscience (Elite edition)

    2021  Volume 13, Issue 1, Page(s) 117–139

    Abstract: Coronavirus disease (COVID-19) is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), a member of the human coronavirus (HCoV) family that targets the lower part of the respiratory tract and causes severe acute respiratory syndrome ( ... ...

    Abstract Coronavirus disease (COVID-19) is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), a member of the human coronavirus (HCoV) family that targets the lower part of the respiratory tract and causes severe acute respiratory syndrome (SARS). In a short span of time, this infection has led to a global pandemic and has become a significant threat to the existence of present human society. Currently, there are no treatments for this infection and the measures established across various countries such as social distancing, usage of mask to prevent entry of the virus into the respiratory tract, quarantine, and containment together have reduced the prevalence of this disease and mortality in highly susceptible individuals. Here, we examine the structure, replication cycle, phylogeny and genomic organization of this virus and discuss the role of spike (S) protein of the virus, an important structure that interacts with the host ACE2 receptor facilitating viral entry. Further, we explore the epidemiology, symptoms of the disease, describe the reverse transcriptase-polymerase chain reaction (RT-PCR) that establishes the diagnosis of the disease and also review its unique diagnostic features in the chest CT-Scan. Finally, we review the current approaches to develop therapies and vaccines as a measure for disease prevention and control.
    MeSH term(s) Betacoronavirus/isolation & purification ; COVID-19 ; COVID-19 Testing ; Clinical Laboratory Techniques/methods ; Coronavirus Infections/diagnosis ; Coronavirus Infections/epidemiology ; Coronavirus Infections/therapy ; Coronavirus Infections/virology ; Humans ; Pandemics ; Pneumonia, Viral/diagnosis ; Pneumonia, Viral/epidemiology ; Pneumonia, Viral/therapy ; Pneumonia, Viral/virology ; SARS-CoV-2
    Keywords covid19
    Language English
    Publishing date 2021-01-01
    Publishing country Singapore
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2565080-4
    ISSN 1945-0508 ; 1945-0494
    ISSN (online) 1945-0508
    ISSN 1945-0494
    DOI 10.2741/874
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Insights into the COVID-19 pandemic

    Mahmoud M. Berekaa

    Frontiers in Bioscience-Elite, Vol 13, Iss 1, Pp 117-

    Origin, pathogenesis, diagnosis, and therapeutic interventions

    2020  Volume 139

    Abstract: Coronavirus disease (COVID-19) is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), a member of the human coronavirus (HCoV) family that targets the lower part of the respiratory tract and causes severe acute respiratory syndrome ( ... ...

    Abstract Coronavirus disease (COVID-19) is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), a member of the human coronavirus (HCoV) family that targets the lower part of the respiratory tract and causes severe acute respiratory syndrome (SARS). In a short span of time, this infection has led to a global pandemic and has become a significant threat to the existence of present human society. Currently, there are no treatments for this infection and the measures established across various countries such as social distancing, usage of mask to prevent entry of the virus into the respiratory tract, quarantine, and containment together have reduced the prevalence of this disease and mortality in highly susceptible individuals. Here, we examine the structure, replication cycle, phylogeny and genomic organization of this virus and discuss the role of spike (S) protein of the virus, an important structure that interacts with the host ACE2 receptor facilitating viral entry. Further, we explore the epidemiology, symptoms of the disease, describe the reverse transcriptase-polymerase chain reaction (RT-PCR) that establishes the diagnosis of the disease and also review its unique diagnostic features in the chest CT-Scan. Finally, we review the current approaches to develop therapies and vaccines as a measure for disease prevention and control.
    Keywords coronaviruses ; covid-19 ; ace2 ; s spike protein ; sars-cov-2 ; pathogenesis ; genomic organization ; transmission diagnosis ; review ; Environmental sciences ; GE1-350 ; Microbiology ; QR1-502
    Subject code 630
    Language English
    Publishing date 2020-10-01T00:00:00Z
    Publisher IMR Press
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Potential impact of great lockdown on students' knowledge, attitude and practices towards the COVID-19 outbreak.

    Berekaa, Mahmoud / Omer, Eltigani / Almoslem, Munthir / Alsahli, Khaled / Aljassim, Mohammed

    F1000Research

    2023  Volume 11, Page(s) 484

    Abstract: Background: ...

    Abstract Background:
    MeSH term(s) Humans ; Male ; COVID-19/epidemiology ; COVID-19/prevention & control ; SARS-CoV-2 ; Health Knowledge, Attitudes, Practice ; COVID-19 Vaccines ; Cross-Sectional Studies ; Communicable Disease Control ; Students ; Disease Outbreaks
    Chemical Substances COVID-19 Vaccines
    Language English
    Publishing date 2023-07-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 2699932-8
    ISSN 2046-1402 ; 2046-1402
    ISSN (online) 2046-1402
    ISSN 2046-1402
    DOI 10.12688/f1000research.110874.2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Impact of Nanolayered Material and Nanohybrid Modifications on Their Potential Antibacterial Activity.

    Alali, Hasna Abdullah / Saber, Osama / Berekaa, Mahmoud Mohamed / Osama, Doaa / Ezzeldin, Mohamed Farouk / Shaalan, Nagih M / AlMulla, Abdulaziz Abdulrahman

    Nanomaterials (Basel, Switzerland)

    2022  Volume 12, Issue 16

    Abstract: Due to an escalating increase in multiple antibiotic resistance among bacteria, novel nanomaterials with antimicrobial properties are being developed to prevent infectious diseases caused by bacteria that are common in wastewater and the environment. A ... ...

    Abstract Due to an escalating increase in multiple antibiotic resistance among bacteria, novel nanomaterials with antimicrobial properties are being developed to prevent infectious diseases caused by bacteria that are common in wastewater and the environment. A series of nanolayered structures and nanohybrids were prepared and modified by several methods including an ultrasonic technique, intercalation reactions of fatty acids, and carbon nanotubes, in addition to creating new phases based on zinc and aluminum. The nanomaterials prepared were used against a group of microorganisms, including
    Language English
    Publishing date 2022-08-11
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano12162749
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Bacterial biopolymer (polyhydroxyalkanoate) production from low-cost sustainable sources.

    Aljuraifani, Amal A / Berekaa, Mahmoud M / Ghazwani, Azzah A

    MicrobiologyOpen

    2018  Volume 8, Issue 6, Page(s) e00755

    Abstract: Twenty-six different bacterial strains were isolated from samples taken from different locations Dammam, Saudi Arabia, for screening of their polyhydroxyalkanoate (PHA) production capability. The initial screening was conducted by staining with Sudan ... ...

    Abstract Twenty-six different bacterial strains were isolated from samples taken from different locations Dammam, Saudi Arabia, for screening of their polyhydroxyalkanoate (PHA) production capability. The initial screening was conducted by staining with Sudan Black B and Nile Red, followed by examination under fluorescence and electron microscopes to characterize PHA granule formation. The PHA-producing bacterial isolates were identified using 16S rRNA gene analyses; the most potent bacterial strain was identified as Pseudomonas sp. strain-P(16). The PHA production capability of this strain in the presence of different low-cost carbon sources, such as rice bran, dates, and soy molasses, was analyzed. PHA production in the presence of rice bran, dates, and soy molasses was 90.9%, 82.6%, and 91.6%, respectively.
    MeSH term(s) Biopolymers/biosynthesis ; Biopolymers/economics ; Industrial Microbiology/economics ; Industrial Microbiology/methods ; Molasses/analysis ; Molasses/microbiology ; Polyhydroxyalkanoates/biosynthesis ; Polyhydroxyalkanoates/economics ; Pseudomonas/genetics ; Pseudomonas/isolation & purification ; Pseudomonas/metabolism ; Waste Products/analysis ; Waste Products/economics
    Chemical Substances Biopolymers ; Polyhydroxyalkanoates ; Waste Products
    Language English
    Publishing date 2018-10-22
    Publishing country England
    Document type Journal Article
    ZDB-ID 2661368-2
    ISSN 2045-8827 ; 2045-8827
    ISSN (online) 2045-8827
    ISSN 2045-8827
    DOI 10.1002/mbo3.755
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Handwashing Knowledge, Attitudes, and Practices among Students in Eastern Province Schools, Saudi Arabia.

    Almoslem, Munthir M / Alshehri, Talal A / Althumairi, Arwa A / Aljassim, Mohammed T / Hassan, Mohamed E / Berekaa, Mahmoud M

    Journal of environmental and public health

    2021  Volume 2021, Page(s) 6638443

    Abstract: ... ...

    Abstract Background
    MeSH term(s) Adolescent ; COVID-19/epidemiology ; COVID-19/prevention & control ; Child ; Cross-Sectional Studies ; Female ; Hand Disinfection ; Health Knowledge, Attitudes, Practice ; Humans ; Male ; Saudi Arabia/epidemiology ; Schools ; Students/psychology ; Students/statistics & numerical data ; Surveys and Questionnaires
    Language English
    Publishing date 2021-09-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2526611-1
    ISSN 1687-9813 ; 1687-9805
    ISSN (online) 1687-9813
    ISSN 1687-9805
    DOI 10.1155/2021/6638443
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Profiling of Essential Mineral Content, Heavy Metals, and Bacterial Contaminants in Conventional and Organic Eggs Available in the Hypermarkets of the Eastern Province of Saudi Arabia.

    Dahlawi, Saad / Berekaa, Mahmoud / Salama, Khaled / Labib, Ossama / Saifullah / Asghar, Waqas / Khalid, Nauman

    Recent patents on food, nutrition & agriculture

    2022  Volume 12, Issue 2, Page(s) 134–142

    Abstract: Background: Eggs are commonly regarded as one of the best sources of various macro and micronutrients, in particular, high biological value (BV) proteins and both saturated and unsaturated fatty acids. Apart from proteins, eggs are excellent sources of ... ...

    Abstract Background: Eggs are commonly regarded as one of the best sources of various macro and micronutrients, in particular, high biological value (BV) proteins and both saturated and unsaturated fatty acids. Apart from proteins, eggs are excellent sources of various high health value lipid components, carotenoids, minerals, and both water and lipid-soluble vitamins. However, the nutrient-rich nature of this 'superfood' also makes them susceptible to microbial contamination from various sources, such as fecal matter, drinking water for layer chicken, and the surrounding environment. Moreover, drinking water and chicken feed are also sources of heavy metal contamination. The presence of both factors poses serious health concerns for consumers.
    Objective: The main aim of this research was to proximate heavy metals and bacterial contaminants in nine different brands of brown organic and conventional white eggs available in the hypermarkets of the Eastern Province of Saudi Arabia.
    Methods: An Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES) was used to determine the concentration of metals with high sensitivity. Standard plate count was followed by enrichment of bacterial contaminants in a double-strength nutrient broth medium for microbiological assessment.
    Results: The results indicated that Pb, Cd, Al, and As were present in high concentrations in all egg brands of both types (organic and conventional). The estimated daily intake (EDI) values for Ca, Fe, Mn, and Mg were within the range of WHO-recommended thresholds, and these essential minerals were present in adequate amounts in all egg brands. The two major groups predominating the microbial loads were the family Enterobacteriaceae and Pseudomonas sp.
    Conclusion: The presence of heavy metals, such as Al, As, Pb, and Cd, in nearly all the brands in amounts that exceeded the established ADI and EDI thresholds was considerably concerning. In particular, the elevated levels of Cd and Pb in group 1 and group 2A probable human carcinogens, respectively, demands that local regulatory authorities investigate the sources of heavy metal contamination and alleviate this considerable risk to human health. Furthermore, this study could be a benchmark for establishing food safety and hygiene standards for local egg production, storage, handling, and transport in Saudi Arabia.
    MeSH term(s) Humans ; Metals, Heavy ; Minerals ; Patents as Topic ; Risk Assessment ; Saudi Arabia
    Chemical Substances Metals, Heavy ; Minerals
    Language English
    Publishing date 2022-01-13
    Publishing country United Arab Emirates
    Document type Journal Article
    ZDB-ID 2486959-4
    ISSN 1876-1429 ; 2212-7984
    ISSN (online) 1876-1429
    ISSN 2212-7984
    DOI 10.2174/2212798412666211007105302
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Synthesis of M-Ag

    Qureshi, Faiza / Nawaz, Muhammad / Ansari, Mohammad Azam / Khan, Firdos Alam / Berekaa, Mahmoud M / Abubshait, Samar A / Al-Mutairi, Rayyanah / Paul, Alok K / Nissapatorn, Veeranoot / de Lourdes Pereira, Maria / Wilairatana, Polrat

    International journal of molecular sciences

    2022  Volume 23, Issue 19

    Abstract: ... employed to synthesize the M-Ag3PO4, (M = Se, Ag, Ta) nanoparticles which were evaluated for antibacterial ... of M-Ag3PO4 nanoparticles were examined. The effect of M-Ag3PO4 nanoparticles on human ... shows a significant decline in the cell viability after treating with M-Ag3PO4 nanoparticles. The IC50 ...

    Abstract Silver Phosphate, Ag3PO4, being a highly capable clinical molecule, an ultrasonic method was employed to synthesize the M-Ag3PO4, (M = Se, Ag, Ta) nanoparticles which were evaluated for antibacterial and cytotoxicity activities post-characterization. Escherichia coli and Staphylococcus aureus were used for antibacterial testing and the effects of sonication on bacterial growth with sub-MIC values of M-Ag3PO4 nanoparticles were examined. The effect of M-Ag3PO4 nanoparticles on human colorectal carcinoma cells (HCT-116) and human cervical carcinoma cells (HeLa cells) was examined by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide) assay and DAPI (4′,6-diamidino-2-phenylindole) staining. Additionally, we analyzed the effect of nanoparticles on normal and non-cancerous human embryonic kidney cells (HEK-293). Ag-Ag3PO4 exhibited enhanced antibacterial activity followed by Ta-Ag3PO4, Ag3PO4, and Se-Ag3PO4 nanoparticles against E. coli. Whereas the order of antibacterial activity against Staphylococcus aureus was Ag3PO4 > Ag-Ag3PO4 > Ta-Ag3PO4 > Se-Ag3PO4, respectively. Percentage inhibition of E. coli was 98.27, 74.38, 100, and 94.2%, while percentage inhibition of S. aureus was 25.53, 80.28, 99.36, and 20.22% after treatment with Ag3PO4, Se-Ag3PO4, Ag-Ag3PO4, and Ta-Ag3PO4, respectively. The MTT assay shows a significant decline in the cell viability after treating with M-Ag3PO4 nanoparticles. The IC50 values for Ag3PO4, Se-Ag3PO4, Ag-Ag3PO4, and Ta-Ag3PO4 on HCT-116 were 39.44, 28.33, 60.24, 58.34 µg/mL; whereas for HeLa cells, they were 65.25, 61.27, 75.52, 72.82 µg/mL, respectively. M-Ag3PO4 nanoparticles did not inhibit HEK-293 cells. Apoptotic assay revealed that the numbers of DAPI stained cells were significantly lower in the M-Ag3PO4-treated cells versus control.
    MeSH term(s) Anti-Bacterial Agents/pharmacology ; Bromides/pharmacology ; Escherichia coli ; HEK293 Cells ; HeLa Cells ; Humans ; Metal Nanoparticles ; Nanoparticles ; Staphylococcus aureus
    Chemical Substances Anti-Bacterial Agents ; Bromides
    Language English
    Publishing date 2022-09-27
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms231911403
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Handwashing Knowledge, Attitudes, and Practices among Students in Eastern Province Schools, Saudi Arabia

    Munthir M. Almoslem / Talal A. Alshehri / Arwa A. Althumairi / Mohammed T. Aljassim / Mohamed E. Hassan / Mahmoud M. Berekaa

    Journal of Environmental and Public Health, Vol

    2021  Volume 2021

    Abstract: Background. Lack of knowledge about appropriate handwashing practices has caused great concerns for human health, especially in the risk of many communicable diseases. The objective of the current study is to determine the level of handwashing knowledge, ...

    Abstract Background. Lack of knowledge about appropriate handwashing practices has caused great concerns for human health, especially in the risk of many communicable diseases. The objective of the current study is to determine the level of handwashing knowledge, attitudes, and practices among school students in Eastern Province Schools, Saudi Arabia. A cross-sectional survey was recruited from November 2019 to March 2020 to assess the level of the students’ handwashing knowledge. A reliable questionnaire was prepared (Cronbach’s alpha = 0.608) and conducted using a two-stage sampling technique. A total of 271 students participated in the study from primary, middle, and high schools; 80% were boys, most of whom displayed an acceptable level of knowledge on hand hygiene. Nearly 75% and 74% of boys and girls, respectively, gained knowledge about hand hygiene practices from their parents. Only 46% of the students thought that handwashing is a potential protective measure against diseases, whereas 34% thought it only removes dirt. Prevalence of handwashing with soap after using the toilet was recognized among 52% of the students. Additionally, 93% of the students used water and soap to wash their hands (p value < 0.001) and 97% suggested that soap and water are the best methods to wash their hands (p value < 0.001). There was a positive correlation between the mother’s education and hand hygiene practices (p value = 0.044). Results collectively indicated that handwashing knowledge and practices among school students in the Eastern Province are acceptable interventions in preventing the transmission of infectious diseases such as COVID-19. Indeed, further improvement conducted through specific health education programs to emphasize the role of handwashing in health hygiene is highly recommended.
    Keywords Public aspects of medicine ; RA1-1270
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher Hindawi Limited
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: ENHANCED PRODUCTION OF POLYHYDROXYBUTYRATE (PHB) FROM AGRO-INDUSTRIAL WASTES; FED-BATCH CULTIVATION AND STATISTICAL MEDIA OPTIMIZATION

    Mahmoud M. Berekaa / Adil M. Al Issa

    Journal of Microbiology, Biotechnology and Food Sciences, Vol 2016, Iss vol. 5, Pp 606-

    2016  Volume 611

    Abstract: Bacillus megaterium SW1-2 showed enhanced growth and polyhydroxybutyrate (PHB) production during cultivation on date palm syrup (DEPS) or sugar cane molasses. FT-IR and NMR spectroscopic analyses of the polymer accumulated during growth on DEPS revealed ... ...

    Abstract Bacillus megaterium SW1-2 showed enhanced growth and polyhydroxybutyrate (PHB) production during cultivation on date palm syrup (DEPS) or sugar cane molasses. FT-IR and NMR spectroscopic analyses of the polymer accumulated during growth on DEPS revealed specific absorption peaks characteristic for PHB. 1.65 g/L of PHB (56.9% CDW) was produced during growth on medium supplemented with 2 g/L of DEPS. Approximately, 36.1% CDW of PHB were recorded during growth on sugar cane molasses. Six runs of different fed-batch cultivation strategies were tested, the optimal run showed approximately 6.87-fold increase. Modified E2 medium was prefered recording 10.11 and 11.34 g/L of total PHB produced for runs 1 and 2, at the end of 96 h incubation period, respectively. Decrease in PHB was recorded during growth on complex medium (run 3 and run 4). In another independent optimization strategy, ten variables were concurrently examined for their significance on PHB production by Plackett-Burman statistical design for the first time. Among variables, DEPS-II and inoculum concentration followed by KH2PO4 and (NH4)2SO4 were found to be the most significant variables encourage PHB production. Indeed, DEPS-II or Fresh syrup is more significant than commercial syrup DEPS-I (p-value= 0.05). RPM, incubation period have highly negative effect on PHB production. Role of ago-industrial wastes, especially DEPS, in enhancement of PHB production was closely discussed.
    Keywords Date syrup or DEPS ; Polyhydroxybutyrate (PHB) ; Bacillus megaterium ; Plackett-Burman design ; fed-batch cultivation ; optimization ; Biotechnology ; TP248.13-248.65 ; Chemical technology ; TP1-1185 ; Technology ; T ; Nutrition. Foods and food supply ; TX341-641 ; Home economics ; TX1-1110 ; Microbiology ; QR1-502 ; Science ; Q
    Language English
    Publishing date 2016-06-01T00:00:00Z
    Publisher Slovak University of Agriculture
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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