Automated modular bacterial filtering system with embeddable microfluidic chips

This paper introduces an automated bacterial filtering system which has three unique advantages comparing to current available systems. Firstly, it is an automatic system which minimizes the human interaction with potentially hazardous bacterial samples, eliminates human errors and makes it suitable for frequent bacterial filtering procedures. Secondly, it provides an interface between milliliter volumes of sample and microfluidic chips requiring samples in microliter volumes. Thirdly, both bacteria collected on the filter and filtrate passed through the filter can be collected for analysis. The modular design of the system provides a large variety of filters for different applications.Peer reviewe

A flexible microrobotic platform for handling microscale specimens of fibrous materials for microscopic studies

One of the most challenging issues faced in handling specimens for microscopy, is avoiding artefacts and structural changes in the samples caused by human errors. In addition, specimen handling is a laborious and time-consuming task and requires skilful and experienced personnel. This paper introduces a flexible microrobotic platform for the handling of microscale specimens of fibrous materials for various microscopic studies such as scanning electron microscopy and nanotomography. The platform is capable of handling various fibres with diameters ranging from 10 to 1000 μm and lengths of 100 μm-15 mm, and mounting them on different types of specimen holders without damaging them. This tele-operated microrobotic platform minimizes human interaction with the samples, which is one of the main sources contributory to introducing artefacts into the specimens. The platform also grants a higher throughput and an improved success rate of specimen handling, when compared to the manual processes. The operator does not need extensive experience of microscale manipulation and only a short training period is sufficient to operate the platform. The requirement of easy configurability for various samples and sample holders is typical in the research and development of materials in this field. Therefore, one of the main criteria for the design of the microrobotic platform was the ability to adapt the platform to different specimen handling methods required for microscopic studies. To demonstrate this, three experiments are carried out using the microrobotic platform. In the first experiment, individual paper fibres are mounted successfully on scanning electron microscopy specimen holders for the in situ scanning electron microscopy diagonal compression test of paper fibres. The performance of the microrobotic platform is compared with a skilled laboratory worker performing the same experiment. In the second experiment, a strand of human hair and an individual paper fibre bond are mounted on a specimen holder for nanotomography studies. In the third experiment, individual paper fibre bonds with controlled crossing and vertical angles are made using the microrobotic platform. If an industrial application requires less flexibility but a higher speed when handling one type of sample to a specific holder, then the platform can be automated in the future.Peer reviewe

Herbal medicines and phytochemicals for obsessive–compulsive disorder

Obsessive–compulsive disorder (OCD) is a relatively prevalent mental disorder that poses significant health burdens on the community. Although current conventional medications have good efficacy for many patients, they can elicit a range of associated adverse effects. Plant‐based compounds have been evaluated for different mental disorders, with a range of anxiolytic properties revealed. To determine the current evidence in the area, we conducted a systematic review using the electronic databases including PubMed, Scopus, and the Cochrane Library up to June 12, 2019, for pharmacological and clinical evidence of herbal medicines and phytochemicals with antiobsessive–compulsive effects. Additional search criteria were employed for locating research on the underpinning mechanisms of action. Results revealed that tentative low‐quality evidence exists for several plant medicines, including Crocus sativus, Silybum marianum, Echium amoenum, Hypericum perforatum, and Withania somnifera, along with several natural molecules, including crocin, cannabidiol, and curcumin. Although more research is needed to confirm effectiveness, present preclinical studies indicate that monoamine pathway modulation (in particular serotonin reuptake inhibition) may be the most important anti‐OCD mechanism among the studied natural compounds