Biochemical Interactions through Microscopic Techniques: Structural and Molecular Characterization.

Many researchers and scientists have contributed significantly to provide structural and molecular characterizations of biochemical interactions using microscopic techniques in the recent decade, as these biochemical interactions play a crucial role in the production of diverse biomaterials and the organization of biological systems. The properties, activities, and functionalities of the biomaterials and biological systems need to be identified and modified for different purposes in both the material and life sciences. The present study aimed to review the advantages and disadvantages of three main branches of microscopy techniques (optical microscopy, electron microscopy, and scanning probe microscopy) developed for the characterization of these interactions. First, we explain the basic concepts of microscopy and then the breadth of their applicability to different fields of research. This work could be useful for future research works on biochemical self-assembly, biochemical aggregation and localization, biological functionalities, cell viability, live-cell imaging, material stability, and membrane permeability, among others. This understanding is of high importance in rapid, inexpensive, and accurate analysis of biochemical interactions.

Additive effects of acupuncture in alleviating anxiety: A double-blind, three-arm, randomized clinical trial.

BACKGROUND: In this trial, additive effects of acupuncture to selective serotonin reuptake inhibitors (SSRIs) treatment for reducing anxiety, were investigated. METHODS: 112 patients with anxiety disorder were randomly divided into three groups including SSRIs alone (drug group), SSRIs with sham acupuncture (control group) and SSRI with acupuncture (acupuncture group), and treated for 4 weeks. At the beginning of the study and on day 28, Spielberger State-Trait Anxiety Inventory (STAI) questionnaire was completed and serum levels of cortisol were measured. RESULTS: 105 patients completed the treatment period. STAI score showed significant differences among the three groups at the end of the study; importantly, changes in STAI score in the acupuncture group were significantly larger than the other groups. A decrease in cortisol levels was observed in all groups; though statistically non-significant, this decrease in the acupuncture group was larger. CONCLUSION: Acupuncture combined with SSRIs can significantly improve anxiety state compared to anti-anxiety therapy using SSRIs alone.

Isolation of arsenic accumulating bacteria from garbage leachates for possible application in bioremediation.

BACKGROUND AND OBJECTIVES: Bioremediation is a process to reduce toxic heavy-metals, such as arsenic, in the environment using microorganisms. This study aimed to isolate arsenic remediating microbial strains from garbage leachates and to evaluate the effects of several factors on bioremediation by isolated strains. MATERIALS AND METHODS: After isolating arsenic-resistant bacteria from garbage leachates and determining their MIC values, Taguchi design of experiments was used to evaluate the effect of arsenic concentration, pH solution, temperature, and contact time on arsenic bioremediation by isolated bacteria. RESULTS: The results revealed that 3 arsenic-resistant strains of genus Bacillus characterized as KL1, KL4, and KL6 had arsenic bioremediation activity. Based on the results, the highest bioremediation of arsenic by Bacillus sp. KL1 was obtained as 77% after 24 hours at 40°C, pH 5, and 150 ppm concentration. However, the maximum bioremediation of arsenic by KL4 (91.66%) and KL6 (88%) was achieved after 24 hours at 40°C, pH 5, and 60 ppm concentration and at 35°C, 90 ppm concentration, pH 5 after 36 hours, respectively. CONCLUSION: The results presented here may facilitate improvements in the eliminating arsenic from contaminated sites and reducing environmental pollutions.

Investigation of the electrical impedance of acupuncture points and non-acupuncture points before and after acupuncture, using a four-electrode device.

AIM: To evaluate the effect of acupuncture on skin electrical impedance of selected points, before and after acupuncture on one acupuncture point (PC6), using a four-electrode device. METHODS: Six acupuncture and non-acupuncture points on both sides of the body were selected to evaluate the effects of acupuncture on electrical properties of these points. RESULTS: There were no results significant differences of electrical impedance before and after acupuncture in the selected points. CONCLUSIONS: According to our experimental set-up, acupuncture at one point without stimulation does not alter skin electrical impedance in healthy volunteers and there is no difference between acupuncture points and non-acupuncture points.

Characterisation of human skin impedance at acupuncture point PC4 Ximen and pericardium meridian using the four-electrode method.

INTRODUCTION: Traditional Chinese medicine offers several theories to explain the mechanism of acupuncture. One of these theories proposes that acupuncture points and meridians have unique electrical properties and their electrical skin impedance is lower than surrounding areas. The aim of this study was to evaluate the differences in electrical skin impedance between PC4 and the pericardium meridian compared with the surrounding areas. METHODS: Eighteen healthy subjects (10 women) were recruited to participate in the study. An impedance meter based on the four-electrode technique was designed specifically for the study. Twenty-five points were marked on the skin: one on the point PC4, four others on the pericardium meridian and 20 points around it. The electrical impedance of each point was measured with the four-electrode device. RESULTS: The mean electrical skin impedance at PC4 was significantly different from the 20 of the surrounding points but not significantly different from the four adjacent points. The mean skin impedance of the five points over the pericardium meridian was significantly different from that of parallel rows of points using repeated measures analysis of variance (p<0.001) CONCLUSION: Within the possible limits of this measurement technique, skin impedance along the pericardium meridian is lower than surrounding areas, supporting the idea of different properties of the pericardium meridian compared with the control areas. Evidence on skin impedance at PC4 is inconclusive and further studies are needed.