---

Background & Objective: Due to volatile property of monomer from Methylmethacrylate and its well known toxic side effects, in case of absorption via skin or respiratory system. Also, due to allergic reactions of it, consideration of suitable ventilation systems and using protective methods is very important. To decrease direct contact with it, the capabilities of technician and improves his health and work place, we investigate relationship between Methanol level and exposure to Methylmethacrylate. Materials & Methods: In a case-control (In vivo) study of 32 dental laboratory technicians in Babol and Sari before and after working and 32 normal subjects, urine samples were collected. Urine Methanol levels were analyzed by paper and gas chromatography. Results: Mean concentration of Methanol in case group (1.2 micro mol/l) was significantly more than control group (0.78 micro mol/l). Also, Methanol level was significantly higher after work (1.45 micro mol/l) when compared to before work (1.27 micro mol/l), (P<0.05). No relation between work history and urine Methanol level was observed. Conclusion: Due to significant increase of Methanol concentration during work in work place, the use of protective methods such as suitable ventilation, wearing mask and gloves, also, using vapor absorbing tubes can be useful in increasing dental laboratory workplace safety.

---

Background&Objective: Staphylococcus aurues is on important cause of community and hospital- aquired infections. Caused by methicillin or oxacillin- resistant s.aureus (MRSA) are mainly nosocomial and are increasingly from many countries word wide. Many attempt have been made by the reasearchers to find new compounds as a subsitute for this antibiotics. The aim of this study was to investigate the antimicrobial activity of alcoholic extracts of 20 medical plants species of Golestan provience on clinical and standard strains of MRSA and MSSA and comprative and detect the best medical plant. Materials&Methods: In this study the compunds of the plant were extracted by percolation method and the effect of ethanolic extract of 20 Iranian medical plants against methicillin resistant and methicillin sensitve strains were assessed by disc diffusion method and each test were repeated 3 times and mean inhibition zone were recorded and then, the minimum inhibitory concentration (MIC) of the extracts, that show good inhibition zone in disc diffusion method, was determined by the micro broth dilution method. Results: The results of antibacterial activity of the ethanolic extracts of 20 plants revealed that, the ethamlic extracts of 8 plants have the best effect on strains and the maximum mean inhibition zone was 22.4 mm and the lowest MIC of plants was 0.01 mg/ml. Conclusion: The result of this study indicate that, ethanolic extract of Eucalyptus. Global, Peganum.hermla, Punica.granatum, Berberis.vulgaris, Ttamarixaphylla, Nnigella.sativa, Hypericum.perforatum AND, Artemisia. Herbaalba have the best antibacterial effect against MRSA andMSSA. The result obtained from these plants might be considered sufficent for further study.

---

Background & Objective: Destructive effects of ethanol consumption have been confirmed on several organs of the body. Nevertheless, classic research which has been done on kidney in this field had less attention. The aim of this study was to evaluate of ethanol effects on light microscopic structure of Mice kidneys. Materials & Methods: In this experimental study, Balb/c strain mice, equally 40 males and females, weighing 30-35 grams were divided in two equal experimental and control groups randomly. The Mice in control and expermented groups further divided in two sub groups. One sub group received 1mg/gr body weight daily of ethanol for one month, intraperitoneally and other sub group received 1mg/gr body weight of ethanol for two months, intraperitoneally. Control groups divided in two sub groups and Mice received daily salin with same volume as experimental groups. Then, the Mice have been anesthetized and sacrificed and then, subsequently kidneys were removed. Routine histological methods and Hematoxylin and Eosin staining were done. Slides were observed by light microscope. Results: In experimental group, Mice which received ethanol for one month, interstitial bleeding and inflammatory cells infiltration in cortical zone of kidney was observed. In Mice which received ethanol for two months, we observed massive and concentrated lymphoblastic infiltration, especially on deep medulla around the blood vessels with extending to calyxes and pelvis of the kidney. No histological changes were observed in control groups. Conclusion: This study showed that the intraperitoneal injection of ethanol cause progressive destruction effects on cortex and medulla of the kidney. These effects depend on duration of ethanol consumption.

---

Background and Objective: Nanosilver particles are one of functional nanotechnology filed. These nanoparticles have antibacterial and antifungal characteritic. Combination therapy is one of new and specific method for therapy of diseases in medicine and pharmacology. Some plants are useful in growth inhibition of Aspergilus Niger. This study was done to evaluate the synergic effect of alcoholic eucalyptus and nanosilver on colony count of Aspergilus Niger. Materials and Methods: In this laboratory study PAN were cultured in PDA medium. Five experimental and one control group were designed for the comparison of synergic effect of alcoholic eucalyptus and nanosilver, nanosilver 50ppm, nanosilver 12.5ppm, eucalyptus ethanolic extract 100%, eucalyptus ethanolic extract 100% mixed with nanosilver 12.5ppm, eucalyptus ethanolic extract mixed with 50ppm, and double distilled water were given to group 1, 2, 3, 4, 5 and control group respectively. Morphological, diameter, and colony numbers in various culture media were compared subsequently. The repeated number of Aspergilus Niger were 24, and they were chosen randomly. Data were analyzed using SPSS-15 and ANOVA test. Results: The Aspergilus niger colony were reduced 8 days following treatment from 200 colony in control group to 90, 75, 55 and 43 in nanosilver group in 12.5 ppm, nanosilver group in 50 ppm, nanosilver group in 50 ppm mixed with eucalyptus ethanolic extract and finally eucalyptus ethanolic extract group, respectivley (P<0.05). The colony count 24 day following treatment were reduced from 200 colony in control group to 42, 14 and 2 in eucalyptus ethanolic extract group, nanosilver group in 12.5 ppm mixed with eucalyptus ethanolic extract and finally nanosilver group in 50 ppm mixed with eucalyptus ethanolic extract, respectivley (P<0.05). Conclusion: This study showed that nanosilver with 50 ppm concentration mixed with eucalyptus ethanolic extract have synergic effect on reducing the Aspergilus niger growth rate.

---

Background and Objective: Antiepileptic drugs can partiality control or achieve the convulsion. There are controversial issues about the use and effect of ethanol to control epileptic convulsion seizers. This study was done to determine the effect of ethanol on microvascular alterations in the brain cortex of epileptic mice treated by valporic acid (VPA). Materials and Methods: In this experimental study, 36 BALB/c mice were allocated randomly into six groups including: 1-PTZ (Pentylenetetrazol), 2- Ethanol, 3- VPA+ PTZ, 4- ethanol + PTZ, 5-ethanol+ VPA+ PTZ and control groups. The animal brains were excluded and stained by Hematoxilin and eosin. Thirty-six optical microscopic field from each group were selected and microvascular count were determined. Immunohistochemical method was used for detection of injuries in the vascular brain tissue. Results: Mean number of brain microvascular cortex significantly increaed in PTZ+ethanol and PTZ+ethanol+VPA groups in compare to controls (P<0.05). Infiltration and thrombophlebitis were observed in vessels and cortical brain tissues in mice which received ethanol and PTZ. Proliferations in endothelial vascular cells were seen in PTZ and VPA+ethanol groups. Immunohistochemical method showed the endothelial cells of PTZ+ethanol groups were more stained in compare to the other experimental groups. Conclusion: Ethanol + PTZ cause cellular infiltration and damage to the cortical brain vessels although VPA reduces histological altheretions.

---

Background and Objective: Bunium percicum is often used in Iranian traditional medicine for the treatment of gastrointestinal disorders particularly gastric ulcer.This study was done to evaluate the antiulcerogenic effect of Bunium percicum Boiss.essential oil against indomethacin and ethanol – induced ulcer models in Wistar rats. Methods: This experimental study was carried out on rats weighing 200-220 g in veterinary college of Urmia University, Iran. LD₅₀ was calculated based on Lorke’s method. To evaluate the short term oral toxicity, animals were allocated into four group of six each. In groups 1-3 animals were received orally 250, 125, 80 mg/kg/bw of Bunium percicum Boiss.essential oil, respectively. Controls were received Tween 80 (2%) orally for 14 consecutive days and monitored daily. Bunium percicum Boiss. essential oil was administered orally at doses of 20, 40 and 80 mg/kg/bw and cimetedin (10 mg/kg/bw) and omopirazol (30 mg/kg/bw) in indomethacin and ethanol–induced ulcer models. Results: The LD₅₀ was 375 mg/kg/bw. Daily single oral doses of Bunium percicum Boiss.essential oil tolerated behaviorally after 14 days without any alterations in body and organs weight, food, water consumption and serum total protein, alanine and aspartate aminotransferase activity. The preventive index in doses of 40 and 80 mg/kg/BW of Bunium percicum Boiss.essential oil was 37.98% and 59.21%, respectively in the indomethacin -induced ulcer model (P<0.05). In the model of ethanol -induced ulcer, the preventive index in doses of 40 and 80 mg/kg of Bunium percicum Boiss. essential oil was 12.40% and 22.05%, respectively (P<0.05). Conclusion: The essential oil of Bunium percicum Boiss is completely ‘‘safe’’ and at the doses of 40 and 80mg/kg/bw significantly prevent gastric ulcers in animal model.