Skin Reactions Following Primary Total Knee Arthroplasty With an Adhesive Superficial Closure System: A Case Series.

BACKGROUND: We investigated a skin adhesive closure device consisting of a self-adhesive polyester mesh placed over the surgical incision, followed by a liquid adhesive that is spread over the mesh and surrounding the skin. It is intended to reduce wound closure times, scarring, and skin complications associated with traditional closure with sutures or staples. The aim of this study was to report on skin reactions in patients who underwent primary total knee arthroplasty (TKA) using the skin adhesive closure system. METHODS: A retrospective review of patients who underwent TKA using adhesive closure between 2016 to 2021 at a single institute was performed. A total of 1,719 cases were analyzed. Patient demographics were collected. The primary outcome was any postoperative skin reaction. Skin reactions were classified as allergic dermatitis, cellulitis, or other. Treatment(s), duration of symptoms, and surgical infections were also collected. RESULTS: A total of 5.0% (86) of patients were found to have any type of skin reaction following their TKA. Of these 86, 39 (2.3%) had symptoms of allergic dermatitis (AD), 23 (1.3%) had symptoms of cellulitis, and 24 (1.4%) had other symptoms. A total of 27 (69%) allergic dermatitis patients were treated with a topical corticosteroid cream only; their symptoms resolved within an average of 25 days. There was only 1 case of superficial infection (<0.001%). No prosthetic joint infections were observed. CONCLUSION: Despite skin reactions appearing in 5.0% of cases, the rate of infection was low. A patient-specific preoperative workup and effective treatment strategies can minimize complications associated with adhesive closure system and increase patient satisfaction following TKA.

Institutional and individual factors associated with functional outcomes in nursing home residents under long-term care insurance in Korea: A multilevel analysis.

OBJECTIVE: The purpose of this study was to analyze the relationship between institutional and individual characteristics that influence changes in the functional outcomes of nursing home residents. METHODS: Long-term Care Insurance claims data with basic information of nursing home(n = 3,263) and long-term care needs assessment data of nursing home residents(n = 34,717) was used. The independent variable was classified into individual (level 1) and nursing home characteristics (level 2). Changes in physical function, cognitive function, and behavioral symptoms were used as dependent variables. RESULTS: The institutional factors of nursing homes contributed relatively little to substantial changes in function of nursing home residents. Ownership, size, and nursing home staff including care worker and physical/occupational therapist were important determinants of functional changes in nursing home residents. CONCLUSION: To improve the quality of nursing homes in Korea, regulations on staffing should be modified, and an disincentive policy should be introduced for low-quality institutions.

Patch-Type Vibration Visualization (PVV) Sensor System Based on Triboelectric Effect.

Self-powered wireless sensor systems have emerged as an important topic for condition monitoring in nuclear power plants. However, commercial wireless sensor systems still cannot be fully self-sustainable due to the high power consumption caused by excessive signal processing in a mini-electronic computing system. In this sense, it is essential not only to integrate the sensor system with energy-harvesting devices but also to develop simple data processing methods for low power schemes. In this paper, we report a patch-type vibration visualization (PVV) sensor system based on the triboelectric effect and a visualization technique for self-sustainable operation. The PVV sensor system composed of a polyethylene terephthalate (PET)/Al/LCD screen directly converts the triboelectric signal into an informative black pattern on the LCD screen without excessive signal processing, enabling extremely low power operation. In addition, a proposed image processing method reconverts the black patterns to frequency and acceleration values through a remote-control camera. With these simple signal-to-pattern conversion and pattern-to-data reconversion techniques, a vibration visualization sensor network has successfully been demonstrated.

Development for Clinical Use of a Multiplexed Immunoassay Using Sputum Samples for Streptococcus pneumoniae: a Non-Culture-Based Approach for Serotype-Specific Detection.

The multiplexed immunoassay (MIA) is an automated, monoclonal antibody-based serotyping assay that uses culture lysates of Streptococcus pneumoniae This study describes the development and validation of applying MIA directly to sputum samples for the serotype-specific detection of S. pneumoniae Sputum optimization involved liquefaction and fractionation. The subjects included 173 adult patients from whom both pneumococcal isolates cultured from sputum samples and the corresponding sputum samples were available at the Korea University Hospital from March 2012 to June 2015. Pneumococcal lysates and the sputum fraction were separately evaluated by MIA with a set A reaction to identify 27 serotypes (24 vaccine serotypes and serotypes 6C, 6D, and 11E). MIA results were validated by multiplex PCR (mPCR). Among the 173 patients analyzed, the pneumococcal isolate MIA detected a single set A serotype in 104 patients, and the corresponding sputum MIA showed concordant results with additional multiple serotypes in 21 patients. For the remaining 69 patients whose pneumococcal isolates were not determined to be set A serotypes by the pneumococcal isolate MIA, the corresponding sputum MIA identified additional set A serotypes (single serotypes, n = 17; multiple serotypes, n = 4). Serotypes 3 and 11A/D/F were the most commonly detected serotypes in both the pneumococcal isolate and sputum MIA analyses. However, serotype 8 was the most prevalent serotype detected only by the sputum MIA. The results of mPCR, performed for validation, showed a high concordance with the results of the sputum MIA. In conclusion, MIA using sputum samples enables the accurate, rapid, direct, and serotype-specific detection of S. pneumoniae, which may improve postvaccination serotype surveillance.

Split-enzyme fragment as a single affinity tag that enables protein expression, purification, and functional assays.

Expressing, isolating, and characterizing recombinant proteins is crucial to many disciplines within the biological sciences. Different molecular tagging technologies have been developed to enable each individual step of protein production, from expression through purification and characterization. Monitoring the entire production process requires multiple tags or molecular interactions, because no individual tag has provided the comprehensive breadth of utility. An ideal molecular tag is small and does not interrupt expression, solubility, folding or function of the protein being purified and can be used throughout the production process. We adapted and integrated a split-luciferase system (NanoBiT®, Promega ®) to perform the range of techniques essential to protein production. We developed a simple method to monitor protein expression in real time to optimize expression conditions. We constructed a novel affinity chromatography system using the split-luciferase system to enable purification. We adapted western blot analysis, enzyme-linked immunosorbent assay, and cell-based bioassay to characterize the expressed proteins. Our results demonstrate that a single-tag can fulfill all aspects needed throughout protein production.

Graphene surface contacts of tin disulfide transistors for switching performance improvement and contact resistance reduction.

We investigated the performance improvement of tin disulfide channel transistors by graphene contact configurations. From its two-dimensional nature, graphene can make electric contacts only at the outermost layers of the channel. For intralayer current flow, two graphene flakes are contacted at the channel's top or bottom layer. For interlayer current flow, one flake is contacted at the top and bottom of each layer. We compared the transistor performance in terms of current magnitude, mobility, and subthreshold swing between the configurations. From such observations, we deduced that device characteristics depend on resistivity or doping level of individual graphene flakes. We also found that interlayer flow excels in the on-current magnitude and the mobility, and that top-contact configuration excels in the subthreshold swing.

Use of Chronic Methadone Before Total Knee Arthroplasty.

BACKGROUND: A subset of patients who undergo total knee arthroplasty (TKA) are on methadone maintenance. They require more and often unpredictable quantities of opioids to function as effective painkillers. This study aims to compare the opioid requirements and the immediate postoperative course for patients on methadone maintenance with those who are not, after a TKA. METHODS: A retrospective, case-control study was performed. From 2005 to 2010, 36 patients, who underwent a unilateral TKA, on chronic methadone maintenance were identified. A control group matched for age, gender, and body mass index comprised patients from the same period, who did not self-report taking methadone. Chart review and analysis of patient demographics, type of anesthesia used, preoperative methadone use, inpatient opioid use (converted to oral morphine equivalent doses), need for in-house pain management consult, length of hospital stay, and need for reoperation were performed. RESULTS: Patients on chronic methadone maintenance used significantly more opioids than patients not on methadone during their entire inpatient stay (P < .001). This was demonstrated by a higher median daily usage of opioids and higher patient-controlled analgesia usage. Patients on methadone maintenance had a significantly longer postoperative inpatient hospitalization (P < .001). Finally, these patients required significantly more inpatient pain management referrals (P = .025). CONCLUSION: There is a significantly higher opioid requirement, length of stay, and pain management consults in patients on methadone maintenance compared with those who are not after a TKA. These patients may benefit from a nonroutine approach to perioperative care in TKA.

DUSP1 induces paclitaxel resistance through the regulation of p-glycoprotein expression in human ovarian cancer cells.

The heterogeneity and genetic instability of ovarian cancer cells often lead to the development of drug resistance, closely related with the increased cancer-related mortality. In this study, we investigated the role of dual-specificity phosphatase 1 (DUSP1) in the development of the resistance in human ovarian cancer cells against paclitaxel. Overexpression of DUSP1 in HeyA8 human ovarian cancer cells (HeyA8-DUSP1) up-regulated the expression of the drug efflux pump, p-glycoprotein. Consequently, HeyA8-DUSP1 cells are highly resistant to paclitaxel, with the resistance comparable to that of a multi-drug resistance cell line (HeyA8-MDR). Moreover, over expression of DUSP1 significantly increased the activation of p38 MAPK, leaving the activation of ERK1/2 and JNK1/2 unaffected. Pharmacological suppression of p38 MAPK activity prevents the up-regulation of p-glycoprotein expression and the consequent resistance against paclitaxel in HeyA8-DUSP1 cells. By contrast, HeyA8-MDR cells expressed a significantly higher level of DUSP1, but treatment with small interference RNA against DUSP1 significantly suppressed the expression of p-glycoprotein and the resistance against paclitaxel in HeyA8-MDR cells. Ectopic expression of MKK3, an upstream activator of p38 MAPK, significantly up-regulated the expression of p-glycoprotein and increased the consequent resistance against paclitaxel in HeyA8 cells. Collectively, these data indicated that DUSP1 may induce the resistance against paclitaxel through the p38 MAPK-mediated overexpression of p-glycoprotein in human ovarian cancer cells.

Procyanidins Mitigate Osteoarthritis Pathogenesis by, at Least in Part, Suppressing Vascular Endothelial Growth Factor Signaling.

Procyanidins are a family of plant metabolites that have been suggested to mitigate osteoarthritis pathogenesis in mice. However, the underlying mechanism is largely unknown. This study aimed to determine whether procyanidins mitigate traumatic injury-induced osteoarthritis (OA) disease progression, and whether procyanidins exert a chondroprotective effect by, at least in part, suppressing vascular endothelial growth factor signaling. Procyanidins (extracts from pine bark), orally administered to mice subjected to surgery for destabilization of the medial meniscus, significantly slowed OA disease progression. Real-time polymerase chain reaction revealed that procyanidin treatment reduced expression of vascular endothelial growth factor and effectors in OA pathogenesis that are regulated by vascular endothelial growth factor. Procyanidin-suppressed vascular endothelial growth factor expression was correlated with reduced phosphorylation of vascular endothelial growth factor receptor 2 in human OA primary chondrocytes. Moreover, components of procyanidins, procyanidin B2 and procyanidin B3 exerted effects similar to those of total procyanidins in mitigating the OA-related gene expression profile in the primary culture of human OA chondrocytes in the presence of vascular endothelial growth factor. Together, these findings suggest procyanidins mitigate OA pathogenesis, which is mediated, at least in part, by suppressing vascular endothelial growth factor signaling.

PBI-05204, a supercritical CO2 extract of Nerium oleander, inhibits growth of human pancreatic cancer via targeting the PI3K/mTOR pathway.

Introduction Oleandrin, a cardiac glycoside, exerts strong anti-proliferative activity against various human malignancies in in vitro cells. Here, we report the antitumor efficacy of PBI-05204, a supercritical C02 extract of Nerium oleander containing oleandrin, in a human pancreatic cancer Panc-1 orthotopic model. Results While all the control mice exhibited tumors by the end of treatment, only 2 of 8 mice (25%) treated for 6 weeks with PBI-05204 (40 mg/kg) showed dissectible tumor at the end of the treatment period. The average tumor weight (222.9 ± 116.9 mg) in mice treated with PBI-05204 (20 mg/kg) was significantly reduced from that in controls (920.0 ± 430.0 mg) (p < 0.05). Histopathologic examination of serial sections from each pancreas with no dissectible tumor in the PBI-05204 (40 mg/kg) treated group showed that the pancreatic tissues of 5/6 mice were normal while the remaining mouse had a tumor the largest diameter of which was less than 2.3 mm. In contrast, while gemcitabine alone did not significantly reduce tumor growth, PBI-05204 markedly enhanced the antitumor efficacy of gemcitabine in this particular model. Ki-67 staining was reduced in pancreatic tumors from mice treated with PBI-05204 (20 mg/kg) compared to that of control, suggesting that PBI-05204 inhibited the proliferation of the Panc-1 tumor cells. PBI-05204 suppressed expression of pAkt, pS6, and p4EPB1 in a concentration-dependent manner in both Panc-1 tumor tissues and human pancreatic cancer cell lines, implying that this novel botanical drug exerts its potent antitumor activity, at least in part, through down-regulation of PI3k/Akt and mTOR pathways.

Characterization of recombinant human growth hormone variants from sodium hyaluronate-based sustained release formulation of rhGH under heat stress.

This study provides the findings of investigations of potential product-related variants on recombinant human growth hormone (rhGH) in a once-weekly sustained release formulation (SR-rhGH) of sodium hyaluronate microparticles and on the rhGH bulk solution used as the active ingredient for SR-rhGH under extreme stress conditions of 24 h at 60 °C. The extent of rhGH degradation was much higher in solution (33%) than in SR-rhGH (10%). The degradation products, especiallyMet14 sulfoxide and deamidated rhGH variants, were separated and quantified by a modified reversed-phase high-performance liquid chromatography (RP-HPLC) method at reduced flow rate. The primary degradation product of rhGH was found to be deamidated rhGH, although an unknown peak was also detected. In contrast, the primary degradation product of SR-rhGH was Met14 sulfoxide rhGH, with no unknown peaks. Using a cell proliferation assay, the biological activities of the isolated products of SR-rhGH degradation were found to be equivalent to those of native hGH, as determined by comparison with a National Institute for Biological Standards and Control standard. In conclusion, SR-rhGH is structurally and functionally stable and maintains the intactness of rhGH.

Optimal Irrigation and Debridement of Infected Total Joint Implants with Chlorhexidine Gluconate.

Previous study at our institution demonstrated that scrubbing a methicillin-resistant Staphylococcus aureus (MRSA)-coated titanium disk with chlorhexidine gluconate (CG) solution achieved superior biofilm eradication compared to alternative solutions. The current study aimed to identify the minimum CG concentration for effective bacteria eradication of an in vitro periprosthetic joint infection (PJI) model. MRSA colony-forming units (CFUs) were counted following simulated irrigation and debridement with varying CG solutions before and after a 24-hour reincubation period. Significant decrease was noted on all disks before reincubation. Postreincubation, significant decrease in CFUs was found in the 4% and 2% groups. This study demonstrated that I+D of an infected PJI model with 4% CG solution was effective at treating MRSA biofilm at concentrations as low as 2%.

Cross-species hybridization of microarrays for studying tumor transcriptome of brain metastasis.

Although the importance of the cellular microenvironment (soil) during invasion and metastasis of cancer cells (seed) has been well-recognized, technical challenges have limited the ability to assess the influence of the microenvironment on cancer cells at the molecular level. Here, we show that an experimental strategy, competitive cross-species hybridization of microarray experiments, can characterize the influence of different microenvironments on cancer cells by independently extracting gene expression data of cancer and host cells when human cancer cells were xenografted into different organ sites of immunocompromised mice. Surprisingly, the analysis of gene expression data showed that the brain microenvironment induces complete reprogramming of metastasized cancer cells, resulting in a gain of neuronal cell characteristics and mimicking neurogenesis during development. We also show that epigenetic changes coincide with transcriptional reprogramming in cancer cells. These observations provide proof of principle for competitive cross-species hybridization of microarray experiments to characterize the effect of the microenvironment on tumor cell behavior.

Differential susceptibility of cells infected with defective and intact HIV proviruses to killing by obatoclax and other small molecules.

OBJECTIVES: Some drugs that augment cell-intrinsic defenses or modulate cell death/survival pathways have been reported to selectively kill cells infected with HIV or Simian Immunodeficiency Virus (SIV), but comparative studies are lacking. We hypothesized that these drugs may differ in their ability to kill cells infected with intact and defective proviruses. DESIGN: To investigate this hypothesis, drugs were tested ex vivo on peripheral blood mononuclear cells (PBMC) from nine antiretroviral therapy (ART)-suppressed individuals. METHODS: We tested drugs currently in clinical use or human trials, including auranofin (p53 modulator), interferon alpha2A, interferon gamma, acitretin (RIG-I inducer), GS-9620/vesatolimod (TLR7 agonist), nivolumab (PD-1 blocker), obatoclax (Bcl-2 inhibitor), birinapant [inhibitor of apoptosis proteins (IAP) inhibitor], bortezomib (proteasome inhibitor), and INK128/sapanisertib [mammalian target of rapamycin mTOR] [c]1/2 inhibitor). After 6 days of treatment, we measured cell counts/viabilities and quantified levels of total, intact, and defective HIV DNA by droplet digital PCR (Intact Proviral DNA Assay). RESULTS: Obatoclax reduced intact HIV DNA [median = 27-30% of dimethyl sulfoxide control (DMSO)] but not defective or total HIV DNA. Other drugs showed no statistically significant effects. CONCLUSION: Obatoclax and other Bcl-2 inhibitors deserve further study in combination therapies aimed at reducing the intact HIV reservoir in order to achieve a functional cure and/or reduce HIV-associated immune activation.

Mechanisms and efficacy of small molecule latency-promoting agents to inhibit HIV reactivation ex vivo.

Drugs that inhibit HIV transcription and/or reactivation of latent HIV have been proposed as a strategy to reduce HIV-associated immune activation or to achieve a functional cure, yet comparative studies are lacking. We evaluated 26 drugs, including drugs previously reported to inhibit HIV transcription (inhibitors of Tat-dependent HIV transcription, Rev, HSF-1/PTEF-b, HSP90, Jak/Stat, or SIRT1/Tat deacetylation) and other agents that were not tested before (inhibitors of PKC, NF-κB, SP-1, or histone acetyltransferase; NR2F1 agonists), elongation (inhibitors of CDK9/ PTEF-b), completion (inhibitors of PolyA-polymerase), or splicing (inhibitors of human splice factors). To investigate if those drugs would vary in their ability to affect different blocks to HIV transcription, we measured levels of initiated, elongated, midtranscribed, completed, and multiply spliced HIV RNA in PBMCs from antiretroviral therapy-suppressed individuals following ex vivo treatment with each drug and subsequent T cell activation. We identified new drugs that prevent HIV reactivation, including CDK and splicing inhibitors. While some drugs inhibited 1 or 2 steps, other drugs (CDK inhibitors, splicing inhibitors, tanespimycin, and triptolide) inhibited multiple stages of HIV transcription and blocked the production of supernatant viral RNA. These drugs and targets deserve further study in strategies aimed at reducing HIV-associated immune activation or achieving a functional cure.

Infection rate following total joint arthroplasty in the HIV population.

The purpose of this study is to review a large series of HIV-infected patients who underwent total joint arthroplasty and identify potential risk-factors for infection. Sixty-nine HIV-infected arthroplasty cases were analyzed with 138 matched controls. Deep infection rate following total hip or knee arthroplasty was 4.4% (3 of 69) among HIV cases compared to 0.72% (1 of 138) among controls, yielding a non-significant 6.22 times increased odds of infection (95% CI 0.64-61.0, P=0.11). Kaplan-Meier survival curves for infection free survival and revision free survival revealed non-significantly decreased survival in HIV cases compared to controls (P=0.06 and P=0.09). Our results suggest that the rate of early joint infection following primary total joint arthroplasty in the HIV-infected population is lower than reported in a number of previously published studies.

The use of dermabond® as an adjunct to wound closure after total knee arthroplasty: examining immediate post-operative wound drainage.

Wound drainage after total knee arthroplasty (TKA) can be detrimental to surgical outcome. This IRB-approved randomized, prospective, blinded study examined the use of Dermabond® as an adjunct to wound closure after TKA. We proposed that Dermabond® supplementation to wound closure would result in a significant decrease in wound drainage after TKA. After standardized closure, patients were randomized into experimental or control groups with the experimental group receiving Dermabond® supplementation. Standardized dressings were evaluated postoperatively and drainage units were compared using a Mann-Whitney U Test. The median drainage for the Dermabond group (153) was lower than the drainage for the control group (657) at a statistically significant level (P<0.001).

Increased 90-Day Mortality and Morbidity Among Patients Recovering From Elective Primary Arthroplasty During the COVID-19 Pandemic in New York City.

All elective procedures were stopped in March 2020 because of the coronavirus disease 2019 (COVID-19) pandemic. We report the 90-day mortality and complications of patients who underwent primary arthroplasty before the stopping of elective procedures at a single academic medical center. A retrospective cohort study was conducted including patients who underwent elective primary arthroplasty between December 2019 and mid-March 2020. Their 90-day postoperative mortality and medical complications were statistically compared with those of a historical cohort from the same operative period in 2019. The 2020 and 2019 cohorts included 372 and 410 patients, respectively. Except for the prevalence of diabetes, there was no significant difference between the two cohorts regarding baseline characteristics or preoperative health. The 2020 cohort had statistically significant higher rates of pneumonia (2.7% vs 0.7%; P=.03), readmission (9.1% vs 5.4%; P=.04), pulmonary embolism (1.6% vs 0.2%; P=.04), and 90-day mortality (1.1% vs 0%; P=.04). The 2020 cohort also had a trend for increased rates of deep venous thrombosis (1.1% vs 0.7%; P=.7) and cardiac complications (1.9% vs 0.5%; P=.07) and no change in emergency department visits (14.0% vs 11.7%; P=.3). There were 7 confirmed cases of COVID-19 in the 2020 cohort and 1 death. This study demonstrates that patients who underwent primary arthroplasty procedures at our institution close to the time of the first wave of the COVID-19 pandemic experienced a statistically significant increase in mortality, pneumonia, pulmonary embolism, and readmission compared with a historical cohort. As elective procedures have resumed during the ongoing pandemic, providers and patients should be aware of these increased risks. [Orthopedics. 202x;4x(x):xx-xx.].

Adsorptive loss of secreted recombinant proteins in transgenic rice cell suspension cultures.

Adsorptive loss of human cytotoxic T-lymphocyte antigen 4-immunoglobulin (hCTLA4Ig) in transgenic rice cell suspension cultures was investigated using glass flasks, plastic flasks, disposable vessels, and stainless steel vessels. When hCTLA4Ig was added to the glass flasks containing sterile AA medium, a rapid decrease in the concentration of hCTLA4Ig, independent on pH, was observed resulting in more than 90% of the protein loss within 1 h due to the surface adsorption. When the same experiments were performed on four different types of culture equipments mentioned above, the lowest adsorption level was observed in the plastic flasks and the highest level was observed in the glass flasks. The use of the plastic flasks retarded the adsorptive loss of hCTLA4Ig at the early stage of the protein production. There was a significant increase in the production of hCTLA4Ig when the flasks were coated with bovine serum albumin. However, the spike test of purified hCTLA4Ig at two different concentrations of 15 and 100 mg L(-1) in 500-mL spinner flasks confirmed that the amount of hCTLA4Ig adsorbed was dependent on the surface area of the flasks but not on the concentrations. In conclusion, although the protein adsorption affected the total amount of the protein yielded to some extent, it could be regarded as a minor factor in transgenic plant cell cultures with higher titer.

Chemical composition, antioxidant activity and larvicidal effects of essential oil from leaves of Apium graveolens.

The leaves of Apium graveolens were extracted and the essential oil composition, immunotoxicity effects, and antioxidant activity were studied. The analyses were conducted by gas chromatography and mass spectroscopy (GC-MS), which revealed the essential oils of A. graveolens leaves. Twenty-eight components, representing 73.72% of the total oil were identified from the leaves. The major components are 4-chloro-4,4-dimethyl-3-(1-imidazolyl)-valerophenone (19.90%), 1-dodecanol (16.55%), 9-octadecen-12-ynoic acid, methyl ester (4.93%), ethyl 4,4-D2-N-hexyl ether (4.11%), 3-(hydroxymethyl)-1-phenyl-1-heptadecyn-3-ol (3.28%), 1,4-methano-1H-indene, octahydro-4-methyl-8-methylene-7-(1-methylethyl)-, [1S-(1α,3αα,4α,7α,7αα)]- (2.99%), 3,4-dihydro-2H-1,5-(3″-t-butyl)benzodioxepine (2.56%), Z-10-tetradecen-1-ol acetate (2.53%), 9H-pyrrolo[3',4':3,4]pyrrolo[2,1-α]phthalazine-9, 11(10H)-dione, 10-ethyl-8-phenyl (2.07%). The leaf oil had significant toxic effects against the larvae of A. aegypti with an LC(50) value of 59.32 ppm and an LC(90) value of 127.69 ppm. The essential oil from the A. graveolens leaves was investigated for scavenging of the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical activity and the results demonstrate that the essential oil from the A. graveolens has potential as a natural antioxidant and thus inhibit unwanted oxidation process. The above data indicate that the major compounds may play an important role in the toxicity of essential oils and also as natural antioxidant.