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1.
Eur J Pediatr ; 181(12): 4067-4077, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36171508

RESUMO

Unstable hemodynamics and prematurity are the main players in intraventricular hemorrhage (IVH) development. Our objective was to study 8 the use of superior vena cava flow (SVCF), left ventricular output (LVO), and right ventricular output (RVO), and anterior cerebral artery (ACA) Doppler measures in prediction of IVH in the first week of life in preterm infant ≤ 32 weeks and birth weight ≤ 1500 g. This prospective cohort study was conducted in 55NICU of Alexandria University maternity hospital. Of 147 enrolled patients, 132 infants born ≤ 32 weeks GA and birth weight ≤ 1500 g were eligible for- the study. One hundred twenty-seven infants completed the study. Infants were scanned for ACA-RI using transfontanellar ultrasound, and SVCF, LVO, and RVO using functional echocardiography in the first 24 h after birth. Patients had another two scans on DOL3 and 7 to detect IVH development. Low SVCF and high ACA-RI significantly increased the risk of IVH using logistic regression models with OR, 3.16; 95%CI, 1.19-8.39; P = 0.02 and OR, 1.64; 95%Cl, 1.10-2.44; P = 0.02, respectively. Low SVCF and high ACA-RI significantly increased risk of catastrophic IVH P = 0.025 and 0.023, respectively. Combined use of low SVCF < 55 ml/kg/min and ACA-RI > 0.75 is predictor of IVH with sensitivity 40.8% and 82.1% specificity. CONCLUSIONS: There are strong relations between both low SVCF and high ACA-RI, and IVH development in premature neonates ≤ 32 weeks and birth weight ≤ 1500 g, with more significance towards catastrophic IVH. Admission RSS and LVO are the strongest factors affecting SVCF. Maternal anemia, patent ductus arteriosus size (mm/kg), and capillary refill time were significantly associated with high ACA-RI. These findings help in more understanding of pathophysiological factors affecting central perfusion that might affect the longer term neurodeveopmental outcome. TRIAL REGISTRATION: This work was registered in clinical trial.gv no NCT05050032. WHAT IS KNOWN: •Whether SVCF and RI-ACA can predict IVH in preterm neonates is still debatable. WHAT IS NEW: •Low SVC flow and high ACA-RI significantly increased risk of IVH, confirming the role of hypoperfusion-reperfusion cycle in IVH development. The most striking result that combined metrics using the cut-off value of < 41 ml/kg/min for SVCF and > 0.85 for ACA-RI "in the first day of life" can correctly reject the presence of IVH in 98% of patients "during the first week of life."


Assuntos
Doenças do Recém-Nascido , Doenças do Prematuro , Feminino , Humanos , Recém-Nascido , Gravidez , Peso ao Nascer , Hemorragia Cerebral/diagnóstico por imagem , Hemorragia Cerebral/etiologia , Circulação Cerebrovascular/fisiologia , Hemodinâmica/fisiologia , Recém-Nascido Prematuro/fisiologia , Doenças do Prematuro/diagnóstico por imagem , Doenças do Prematuro/etiologia , Estudos Prospectivos , Veia Cava Superior/diagnóstico por imagem , Veia Cava Superior/fisiologia
2.
Soft Matter ; 17(8): 2215-2222, 2021 Mar 04.
Artigo em Inglês | MEDLINE | ID: mdl-33464271

RESUMO

Poly(vinylidene fluoride) (PVDF) is among the most versatile polymers due to its wide range of properties, including dielectric, piezoelectric and ferroelectric properties. However, more frequently than not a range of processing routes and/or additives have been used to enhance such properties. In this study, PVDF nanofibers were electrospun from PVDF solution that contained tetra-n-butyl ammonium chloride (TBAC) at different loadings (1, 2, 3, and 5 wt%). The effect of TBAC on the morphology, crystallinity, and polymorphism of PVDF was studied using various characterization techniques. Addition of TBAC significantly improved the electroactive ß-phase of PVDF. The highest ß-phase content of 89% was attained at a TBAC loading of 3 wt%. Consequently, the dielectric and piezoelectric properties of the PVDF nanofibers improved significantly. A nanogenerator fabricated using 3 wt% TBAC/PVDF nanofibers exhibited the maximum voltage output of 17.2 V (under 5 N force) and the maximum power density of ∼1.4 µW cm-2 (under 3 N force). Improved dielectric and piezoelectric properties of PVDF upon the addition of a small amount of TBAC could be useful for researchers in upbringing the material for flexible electronic devices.

3.
Soft Matter ; 17(48): 10891-10902, 2021 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-34807219

RESUMO

Herein, a multifunctional poly(vinylidene fluoride) (PVDF)/mica nanosheet composite (PMNC) thin film was developed for preparing a capacitive and piezoelectric force sensor. A high electroactive γ-phase content (89%) of PVDF was achieved through a facile rapid cooling process of PMNC films. The crystallinity of PVDF decreased upon the addition of mica nanosheets, while the dielectric constant increased significantly (∼300%). The capacitance-based PMNC pressure sensor was found to be sensitive to the applied pressure. On the other hand, piezoelectric voltages of 18 V (single layer) and 32 V (multi-layer) were generated for PMNCs loaded with 1% mica nanosheets. Furthermore, a PMNC based nanogenerator generated a power density of 8.8 µW cm-2 and showed excellent durability (>60 000 cycles). High flexibility, lightweight and skin-friendly PMNCs could be a potential material in applications such as energy harvesting, energy storage, actuators, and self-powered and smart wearable electronic devices.

4.
Nanotechnology ; 32(48)2021 Sep 07.
Artigo em Inglês | MEDLINE | ID: mdl-34412041

RESUMO

In this study, a highly flexible and wearable nitrogen dioxide (NO2) gas sensor was fabricated based on electrospun poly(vinylidene fluoride) (PVDF)/polyaniline (PANi)/graphitic-carbon nitride (g-C3N4) blend nanocomposite (EBNC). g-C3N4/PANi nanocomposite (GPC) was synthesized byin situpolymerization technique prior to its incorporation into PVDF nanofibers, which ensured uniformity of dispersion. For the comparison study, PVDF/GPC nanocomposite film was fabricated using doctor blade technique. EBNC sensor exhibited high sensitivity, selectivity, reproducibility along with quick response and complete recovery. Electrospinning and GPC synergistically improved the performance of the EBNC based gas sensor. The superior gas sensing ability along with its low cost and the use of scalable electrospinning technique could make this system a promising one for the detection of gaseous NO2.

5.
Saudi Pharm J ; 28(8): 1049-1054, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32792849

RESUMO

PURPOSE: The main aim of this study is to estimate the economic burden and prevalence of bites and stings injuries in Saudi Arabia. METHODS: A retrospective, cross-sectional study was conducted at King Saud University Medical City (KSUMC) for all bites and stings cases presented to the Emergency Department (ED) between the period June 2015 and May 2019. RESULTS: A total of 1328 bites and stings cases were treated in the ED at KSUMC. There were 886 insect bites and stings cases, 376 animal bites, 22 human bites, 34 scorpion stings, and ten snakebites. Most cases were reported in April - June. Females account for 62% of the reported cases, and the mean age was 24 years old. The total management cost of bite and sting cases during the study period was 3.4 million Saudi Riyal (SR). The spending cost of the management of animal bites was the highest as it cost 1,681,920.76 SR, followed by insect's management costing 1,228,623.68 SR. CONCLUSION: Bites and stings have a considerable health care burden on our society. Although the vast majority of the cases were not associated with a severe life-threatening condition, many were visit ED and associated with high medical costs. Increased awareness of the hazards of animal-related injuries, especially during spring and summer, where most cases take place may lower its incidence and decrease EDs visits.

6.
Adv Exp Med Biol ; 972: 131-139, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28004307

RESUMO

Health threats due to infectious diseases used to be a major public health concerns around the globe till mid of twentieth century when effective public health interventions helped in eradicating a number of infectious diseases around the world. Over the past 15 years, there has been a rise in the number of emerging and reemerging infectious diseases being reported such as the Acute Respiratory Syndrome (SARS) in 2002, HINI in 2009, Middle East Respiratory Syndrome (MERS) in 2012, Ebola in 2014, and Zika in 2016. These emerging viral infectious diseases have led to serious public health concerns leading to death and causing fear and anxiety among the public. More importantly, at the moment, the prevention and control of viral infectious diseases is difficult due to a lack of effective vaccines. Thus having real-time reporting tools are paramount to alert relevant public health surveillance systems and authorities about taking the right and necessary actions to control and minimize the potential harmful effects of viral infectious diseases. Social media and Internet-based data can play a major role in real-time reporting to empower active public health surveillance systems for controlling and fighting infectious diseases.


Assuntos
Controle de Doenças Transmissíveis/métodos , Internet , Mídias Sociais , Viroses/prevenção & controle , Vigilância da População
7.
Sci Justice ; 64(2): 243-249, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38431381

RESUMO

This article investigates a critical part of professional careers: adhering to a code of ethics that defines proper behavior within the context of one's specialized practice. It aims to improve the setting of forensic entomology work by highlighting the ethical issues that frequently emerge. The primary goal is to uncover common ethical issues involved in this field's everyday activities and provide informed advice on appropriate resolution options. This investigation dives into the complex interaction of religious beliefs, cultural aspects, and issues of ethics, evaluating their relevance in forensic entomology. It examines a wide range of ethical issues, from the ethics involved in collecting samples at crime scenes and morguesto the ethics created into scientific investigations, report writing, and court testimony. These guiding principles are critical in setting scientific standards and building public trust in forensic entomology's ability to provide exceptional services. Notably, regardless of whether the forensic entomology service provider is accredited by any validating organization, these ethical requirements remain critical, emphasizing their global application.


Assuntos
Entomologia Forense , Humanos , Ciências Forenses/métodos , Ética Profissional , Responsabilidade Social
8.
J Funct Biomater ; 15(7)2024 Jun 29.
Artigo em Inglês | MEDLINE | ID: mdl-39057301

RESUMO

Orthoses and prostheses (O&P) play crucial roles in assisting individuals with limb deformities or amputations. Proper material selection for these devices is imperative to ensure mechanical robustness and biocompatibility. While traditional manufacturing methods have limitations in terms of customization and reproducibility, additive manufacturing, particularly pellet extrusion (PEX), offers promising advancements. In applications involving direct contact with the skin, it is essential for materials to meet safety standards to prevent skin irritation. Hence, this study investigates the biocompatibility of different thermoplastic polymers intended for skin-contact applications manufactured through PEX. Surface morphology analysis revealed distinct characteristics among materials, with TPE-70ShA exhibiting notable irregularities. Cytotoxicity assessments using L929 fibroblasts indicated non-toxic responses for most materials, except for TPE-70ShA, highlighting the importance of material composition in biocompatibility. Our findings underscore the significance of adhering to safety standards in material selection and manufacturing processes for medical devices. While this study provides valuable insights, further research is warranted to investigate the specific effects of individual ingredients and explore additional parameters influencing material biocompatibility. Overall, healthcare practitioners must prioritize patient safety by meticulously selecting materials and adhering to regulatory standards in O&P manufacturing.

9.
Water Res ; 258: 121749, 2024 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-38762912

RESUMO

The objective of this investigation is to assess the performance of various heat exchangers for application in a novel solar-powered zero liquid discharge humidification-dehumidification desalination system. In this study four heat exchangers (HX) having two different flow configurations namely counter flow (cf), cross flow (cr) made up of three different materials namely high-density polyethylene (HDPE), aluminum (Al), and Polypropelyne (PP) were compared in terms of their effectiveness and overall heat transfer coefficient under varying salinity levels (up to 10%) and mixing ratios (0.22-0.45). At a mixing ratio of 0.22 and 0% salinity, PP-HXcr and Al-HXcf exhibited similar effectiveness (∼85%), surpassing that of HDPE-HXcf (∼65%). Despite PP-HXcr's lower thermal conductivity in comparison to Al-HXcf, comparable effectiveness was achieved due to the superior flow distribution in PP-HXcr. Further investigations focused on the impact of salinity on heat exchanger performance. At 3.5% salinity, all heat exchangers experienced a decline in effectiveness and heat transfer coefficient (HTC), with Al-HXcf experiencing a more pronounced decrease compared to PP-HXcr. The higher thermal conductivity of Al-HXcf led to greater salt accumulation, while PP-HXcr demonstrated minimal fouling. As the experiment progressed, fouling increased for all heat exchangers, with the Al-HXcf being practically ineffective at 10% salinity with an effectiveness below 10%. To address the issue of fouling, a rotating cross-flow heat exchanger (RPP-HXcr) was introduced. While the effectiveness of the PP-HXcr drops from 85% to approximately 60% with increasing salinity from 0% to 10%, the RPP-HXcr demonstrates only a marginal decline in effectiveness with increasing salinity. For instance, at mixing ratio of 0.22 when the salinity is increased from 0% to 10%, the effectiveness of RPP-HXcr only drops from 83% to 77%. This exceptional performance was attributed to the continuous contact between the rotating tubes and the incoming feed, effectively preventing fouling and ensuring sustained efficiency. Rotating cross-flow heat exchanger (RPP-HXcr) is introduced and validated as a potentially reliable solution for mitigating fouling, as it demonstrates sustained efficiency and minimal performance degradation across different salinity conditions.


Assuntos
Temperatura Alta , Polímeros , Salinidade , Purificação da Água , Polímeros/química , Purificação da Água/métodos
10.
Saudi J Biol Sci ; 30(7): 103706, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-37440960

RESUMO

Burial has a special influence on carrion fauna, which may change the rate of decomposition and so affect postmortem estimates. This study aimed to identify species and succession of beetles on buried remains. From 28 January to 31 May 2021, we examined the Coleoptera on buried and exposed rabbit carcasses, on the campus of the University of King Saud in an area measured around 175 m by 250 m. The area is almost entirely devoid of flora, except for a few acacia trees and some common wild herbs. It is about 1 km away from residential neighborhoods. In total, 165 specimens belonging to 4 families were collected. The Tenebrionidae was the most abundant family, where it formed 52% at a depth of 20 cm and 78% at a depth of 40 cm in the buried carcasses, while the family Dermestidae was the most abundant in the surface carcasses, as it formed 53% of the insects sampled. Type Mesostena puncticollis Solier, 1835 (Tenebrionidae) predominated at exposed carcasses as well as at depths of 20, 40 cm and while type Dermestes frischii Kugelann, 1792 (Dermestidae), predominated at depth of 40 cm and exposed carcasses, and type Saprinus chalcites (Illiger, 1807) (Hisiteridae) at depth of 20 only. These findings are possibly useful in forensic investigations involving buried bodies in Riyadh, Saudi Arabia.

11.
Saudi J Biol Sci ; 30(11): 103822, 2023 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-37869362

RESUMO

The rabbit carcasses used in this study were buried at depths of 20 and 40 cm, were examined to construct a fly succession database on buried carrion in Riyadh, Saudi Arabia. Twenty-four rabbits were buried, 12 at 20 cm and 12 at 40 cm. One carcass at each depth was exhumed at 10-day intervals up to 120 days. The degradation rate varied among the carcasses. Differences in species and their colonization were also found in the superficial and exhumed carcasses. Eleven species of flies were recorded on carcasses interred at a depth of 20 cm and seven species at 40 cm, while 13 species were recorded on the carcasses over the top of the soil. Species Rhyncomya sp (Diptera: Calliphoridae), Sarcophaga dux Thomson, and Dolichotachina marginella (Wiedemann) (Diptera: Sarcophagidae) were dominant at both depths, while Chrysomya albiceps (Wiedeman), Chrysomya rufifaces (Macquart) (Diptera: Calliphoridae), Musca domestica Linnaeus, and Musca sorbens Wiedemann (Diptera: Muscidae) were dominant in surface carcasses. Megaselia scalaris (Loew) ((Diptera: Phoridae) is a common and typical forensic indicator that was found in the decay/advanced decay and dry stages at a depth of 20 cm. These findings are possibly useful in forensic investigations involving buried bodies in Riyadh, Saudi Arabia.

12.
Saudi J Biol Sci ; 30(4): 103611, 2023 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-36970253

RESUMO

Infectious diseases transmitted by vectors have claimed millions of lives. The mosquito Culex pipiens is a main vector species of Rift Valley Fever virus (RVFV) transmission. RVFV is an arbovirus that infects both people and animals. No effective vaccine or drugs are available for RVFV. Therefore, it is vital to find effective therapies for this viral infection. Because of their critical roles in transmission and infection, acetylcholinesterase 1 (AChE1) of Cx. Pipiens and RVFV glycoproteins, and nucleocapsid proteins are appealing protein targets. To understand intermolecular interactions, computational screening was carried out using molecular docking. More than 50 compounds were tested against different target proteins in the current study. Anabsinthin (-11.1 kcal/mol), zapoterin (-9.4 kcal/mol), porrigenin A (-9.4 kcal/mol), and 3-Acetyl-11-keto-beta-boswellic acid (AKBA) (-9.4 kcal/mol) were the top hit compounds for Cx. Pipiens. Similarly, the top hit compounds for RVFV were zapoterin, porrigenin A, anabsinthin, and yamogenin. The toxicity of Rofficerone is predicted as fatal (Class II), whereas Yamogenin is safe (Class VI). Further investigations are needed to validate the selected promising candidates against Cx. pipiens and RVFV infection using in-vitro and in-vivo methods.

13.
JMIR Form Res ; 7: e44551, 2023 Jun 05.
Artigo em Inglês | MEDLINE | ID: mdl-37134019

RESUMO

BACKGROUND: Most individuals seeking asylum in Germany live in collective housing and are thus exposed to a higher risk of contagion during the COVID-19 pandemic. OBJECTIVE: In this study, we aimed to test the feasibility and efficacy of a culture-sensitive approach combining mobile app-based interventions and a face-to-face group intervention to improve knowledge about COVID-19 and promote vaccination readiness among collectively accommodated Arabic-speaking adolescents and young adults. METHODS: We developed a mobile app that consisted of short video clips to explain the biological basis of COVID-19, demonstrate behavior to prevent transmission, and combat misconceptions and myths about vaccination. The explanations were provided in a YouTube-like interview setting by a native Arabic-speaking physician. Elements of gamification (quizzes and rewards for solving the test items) were also used. Consecutive videos and quizzes were presented over an intervention period of 6 weeks, and the group intervention was scheduled as an add-on for half of the participants in week 6. The manual of the group intervention was designed to provide actual behavioral planning based on the health action process approach. Sociodemographic information, mental health status, knowledge about COVID-19, and available vaccines were assessed using questionnaire-based interviews at baseline and after 6 weeks. Interpreters assisted with the interviews in all cases. RESULTS: Enrollment in the study proved to be very challenging. In addition, owing to tightened contact restrictions, face-to-face group interventions could not be conducted as planned. A total of 88 participants from 8 collective housing institutions were included in the study. A total of 65 participants completed the full-intake interview. Most participants (50/65, 77%) had already been vaccinated at study enrollment. They also claimed to comply with preventive measures to a very high extent (eg, "always wearing masks" was indicated by 43/65, 66% of participants), but practicing behavior that was not considered as effective against COVID-19 transmission was also frequently reported as a preventive measure (eg, mouth rinsing). By contrast, factual knowledge of COVID-19 was limited. Preoccupation with the information materials presented in the app steeply declined after study enrollment (eg, 12/61, 20% of participants watched the videos scheduled for week 3). Of the 61 participants, only 18 (30%) participants could be reached for the follow-up interviews. Their COVID-19 knowledge did not increase after the intervention period (P=.56). CONCLUSIONS: The results indicated that vaccine uptake was high and seemed to depend on organizational determinants for the target group. The current mobile app-based intervention demonstrated low feasibility, which might have been related to various obstacles faced during the delivery. Therefore, in the case of future pandemics, transmission prevention in a specific target group should rely more on structural aspects rather than sophisticated psychological interventions.

14.
Cell Immunol ; 273(1): 10-6, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22218396

RESUMO

In the present study we evaluated the anti-tumor potential of samsum ant venom (SAV) from Pachycondyla sennaarensis on the human breast carcinoma cell line MCF-7. We found that SAV induced growth arrest of MCF-7 cells without affecting the viability of MCF-10 (non-tumorigenic normal breast epithelial cells) and normal PBMCs. We then analyzed its impact on IGF-1-mediated MCF-7 cell proliferation and its effect on the underlying IGF-1 signaling pathways. Using flow cytometry analysis, we showed that the percentage of apoptotic cells was fourfold higher in SAV-treated cells as compared to untreated cells. More importantly, treatment with SAV induced a marked reduction in actin polymerization and a subsequent marked reduction in IGF-1-mediated cell proliferation. In addition to growth-inhibitory and pro-apoptotic effects, significant reductions were also observed in the phosphorylation of AKT and ERK, but not p38MAPK, in SAV-treated cells as compared to untreated cells. Our data reveal unique anti-tumor effects of samsum ant venom.


Assuntos
Venenos de Formiga/farmacologia , Apoptose/efeitos dos fármacos , Neoplasias da Mama/tratamento farmacológico , MAP Quinases Reguladas por Sinal Extracelular/metabolismo , Fator de Crescimento Insulin-Like I/metabolismo , Fosfatidilinositol 3-Quinase/metabolismo , Proteínas Proto-Oncogênicas c-akt/metabolismo , Neoplasias da Mama/enzimologia , Neoplasias da Mama/patologia , Processos de Crescimento Celular/efeitos dos fármacos , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Feminino , Citometria de Fluxo , Humanos , Immunoblotting , Sistema de Sinalização das MAP Quinases , Fosforilação
15.
Skeletal Radiol ; 41(11): 1465-8, 2012 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-22584461

RESUMO

We describe the case of a 26-year-old patient with a perivascular epithelioid cell tumour (PEComa) involving the 5th lumbar vertebra. Radiological findings, pathological features and treatment are presented. We conclude that PEComas should be considered in the differential diagnosis of vertebral lesions.


Assuntos
Vértebras Lombares , Neoplasias de Células Epitelioides Perivasculares/diagnóstico , Neoplasias da Coluna Vertebral/diagnóstico , Adulto , Cimentos Ósseos , Descompressão Cirúrgica , Diagnóstico Diferencial , Humanos , Imageamento por Ressonância Magnética , Masculino , Neoplasias de Células Epitelioides Perivasculares/patologia , Neoplasias de Células Epitelioides Perivasculares/cirurgia , Neoplasias da Coluna Vertebral/patologia , Neoplasias da Coluna Vertebral/cirurgia , Tomografia Computadorizada por Raios X , Vertebroplastia/métodos
16.
Saudi J Biol Sci ; 29(1): 279-286, 2022 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-35002420

RESUMO

Plant secondary metabolites represent the most efficient and convenient method to control and overcome environmental pollution and insecticidal resistance. This study explored the mosquitocidal activity of the combined extract of seven plants, (HF7) extracted using a Soxhlet extractor against Culex pipiens under laboratory conditions. Exposure of the 3rd instars of Cx. pipiens to HF7 hexane extract resulted in LC50:114.5 µg/mL and LC90:117.0 µg/mL values after 24 h. The ovicidal activities of hexane extract against Cx. pipiens eggs were 21.6%, 48.3%, and 71.6% at 187.5, 93.7, and 46.88 µg/mL, respectively. HF7-treated larvae showed the formation of irregular blebbing of epithelial cells toward the lumen and sloughing into the gut lumen. HF7 extract resulted in 100% adulticidal mortality at the concentration of 3.7 mg/test tube after 30 min of exposure. The IC50 of HF7 extract was 97.03 µg/ml against larvae, at which nuclear and morphological changes were observed. The spectroscopy spectrum of HF7 hexane extract disclosed the presence of 57 different secondary metabolites, among which the dominant compound was eugenol (32.3%). HF7 hexane extract could serve as a botanical insecticide for controlling Cx. pipiens and potentially other mosquito species.

17.
Saudi J Biol Sci ; 29(4): 2591-2596, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35531167

RESUMO

In order to develop an eco-friendly botanical larvicide alternative to the synthetic larvicides, extracts were prepared from the Cinnamomum burmannii (C.B.) and Syzygium aromaticum (S.A.) with hexane using a sonicator. The extracts were evaluated for larvicidal activity individually and in combination against the Culex pipiens larvae. The LC50 value of C.B. and the S.A. hexane extracts tested individually were 184.2 and 363.7 µg/mL against Cx. pipiens respectively. All the combinations of the extract of C.B. and S.A. showed synergistic factors higher than one. Among the different ratios of extracts, the SA25%: CB75% extract was found to be more toxic than the other combinations (LC50:125.7 µg/mL). Midgut cells treated with S.A. 25%: C.B. 75% extract showed severe morphological alterations such as degradation of microvilli; degeneration of epithelial cells, and peritrophic membrane; loss of nuclei, irregular and damage of microvilli. The extract has a promising larvicidal potential against Cx. pipiens, However, the extract was toxic against HUVEC cells, as evident from MTT and cell morphology. Further investigation is required to assess the toxicity of the extract on aquatic animals.

18.
J Med Entomol ; 59(5): 1556-1561, 2022 09 14.
Artigo em Inglês | MEDLINE | ID: mdl-35703102

RESUMO

Chalcid Brachymeria podagrica (Fabricius), formerly known as Brachymeria fonscolombei (Dufour), is a parasitoid wasp that infests dipteran larvae of fly, Sarcophaga dux (Thomson), (Diptera: Sarcophagidae) recovered from the dead body of sheep in Bisha City, Asir region-Saudi Arabia. S. dux larvae were infested by B. podagrica. The first instar larvae and pupae of B. podagrica were found inside the larvae and pupae of S. dux. The adults of the parasitic wasp emerged from the pupae of the host. Adults and larvae of the parasitoid wasp were observed under a dissecting microscope. Identification was made by following the identification keys. It was confirmed that it was B. podagrica, which is herewith reported for the first time in Saudi Arabia.


Assuntos
Besouros , Dípteros , Sarcofagídeos , Vespas , Animais , Larva , Pupa/parasitologia , Arábia Saudita , Ovinos
19.
J Med Entomol ; 59(3): 820-825, 2022 05 11.
Artigo em Inglês | MEDLINE | ID: mdl-35147699

RESUMO

The flesh fly Sarcophaga ruficornis (Fabricius) is one of the fly species of significant medical and forensic importance since it is one of the most common flesh flies used in forensic investigations. Zolpidem tartrate is a sedative-hypnotic drug used for the short-term treatment of insomnia in adults and its use has been implicated in many suicide cases worldwide. Fresh chopped liver of buffalo Bubalus bubalis (Artiodactyla: Bovidae) containing different concentrations of Zolpidem tartrate was given to S. ruficornis larvae to evaluate the effect of Zolpidem tartrate on the developmental rate of the different stages, life cycle duration, and the morphological parameters. The findings have shown significant variation in the time required for the different developmental stages and total life cycle duration, which correlated positively with the Zolpidem tartrate concentration in different cultures. Compared to the control, the morphological parameters were negatively correlated with the concentration of Zolpidem tartrate in the treated cultures. The obtained results indicate that the Zolpidem tartrate retards larval development and alters the estimation of the total developmental duration. Thus, when Zolpidem tartrate may be the cause of death, the entomological evidence needs to be analyzed so it takes zolpidem-related changes to the mPMI into account.


Assuntos
Dípteros , Sarcofagídeos , Animais , Humanos , Hipnóticos e Sedativos/farmacologia , Larva , Estágios do Ciclo de Vida , Zolpidem
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