Development of next-generation sterilization method by a plasma flow at atmospheric pressure

Features

Plasma sterilization has been developed as an alternative sterilization method due to its chemical activity, operation at low temperature and atmospheric pressure, low power consumption, low cost and safety. We have studied a mechanism of chemical species generation and transport in a plasma flow and, the sterilization efficacy and mechanism for several plasma sources at atmospheric pressure, such as a microwave plasma flow, a dielectric barrier discharge in a tube and a water vapor plasma flow. We already clarified that the damages of outer membrane and destructions of the cytoplasmic membrane of Escherichia coli by exposure to the microwave plasma flow. Fig. 1 shows the effect of plasma exposure on the E. coli. When the E. coli was exposed to the plasma, the height of the E. coli decreased and the potassium leakage of cytoplasmic material increased. For sterilization in a tube, we also clarified that an induced flow in the narrow tube by DBD transports chemical species and sterilize the whole inside surface of a tube as shown in Fig. 2. We hope to conduct collaborative research with a willing company for a practical application of this technology in industry.

Oral Biofilm Functional Analysis: from “What Are They?" to “What Are They Doing?"

Features

A large number of microorganisms inhabit the oral cavity, such as the teeth, gingiva and tongue, in the form of oral biofilm. The oral cavity forms an ecosystem where the host (humans) and parasites (microorganisms) coexist. Disruption of the balance of this oral ecosystem leads to dental caries, periodontal diseases and oral malodor, and even deterioration of dental materials.

Using leading-edge techniques of anaerobic experimental systems including original and unique devices, as well as the notion of "omics" such as metagenomics and metabolomics, we conduct research on oral biofilm functions. Knowledge of oral biofilms, from "what are they?" to "what are they doing?", enables us to address their control, that is, prevention of and therapy for oral biofilm-associated diseases.

Targeted Application(s)/Industry

Risk assessment of oral biofilm-associated diseases, such as dental caries, periodontal disease, oral malodor and aspiration pneumonia
Effects of medicine and food ingredients on oral biofilm function
Evaluation of biofilm-mediated material deterioration

Methods to Restore Strelity of Gramineous Plants under High- and Low-Temperature Stress Conditions

Features

Plant reproductive development is more sensitive than vegetative growth to many environmental stresses. High-temperature injury is becoming an increasingly serious problem due to recent global warming. In wheat, barley, and other crops, the early phase of anther development is most susceptible to high temperature. Oppositely, grain yields in rice plants are often reduced by exposure to low temperature. Unexpected climate change, such as abnormally hot or cool summer temperatures, have occurred repeatedly during recent years. This method indicates that an appropriate use of specific phytohormones, such as auxin and GA, may promote stress tolerance and adaptation to abiotic stresses.

Targeted Application(s)/Industry

These potentially novel functions of the classical phytohormones will be important sustainable agriculture in the face of global climate change.

Assessment of Physical Activities Using Wearable Sensors

Features

Maintaining appropriate amount of physical activity is essential for health and disease prevention. Gait is the most common type of physical activity in everyday life. Monitoring the amount of physical activity in everyday lives may benefit mainly those who are at threat of metabolic syndrome and overweight. Towards better estimation of the amount of physical activity utilizing wearable sensors, we focused on taking running and walking economy into account. The relationship between step length and oxygen uptake was first determined. Step length estimation with moderate accuracy was accomplished using acceleration signals during walking. Step length was then taken into energy expenditure calculation as one of the variables.

Targeted Application(s)/Industry

Together with the basic version of the current locomotion monitoring system capable of counting staircase climbing up & down, we managed to upgrade our locomotion monitoring system into 3 dimensional.

Quantitative Evaluation of the Baroreflex Sensitivity of the Heart and Artery

Features

Metabolic syndrome is an important view point, when we consider the preventive medicine. Hypertension is one of the most important points to prevent the cardiovascular events. However, there is no method to measure the baroreflex sensitivity of the artery in the patients with hypertension. Tohoku University had invented the new method to evaluate the baroreflex sensitivity of the heart and artery (JP Patent No.4789203).

Targeted Application(s)/Industry

By the use of this machine, the baroreflex sensitivity of an artery in the patients can easily be measured noninvasively. It enables to predict the occurrence of hypertension and evaluate the therapy of hypertension easily, while allowing prevention of the cardiovascular events.

Development of New Drugs and Devices Regulating Inter-Organ Neural Network for Obesity Therapy

Features

Obesity induced the metabolic syndrome, which causes cardiovascular diseases. Obesity has now become a major health concern not only in developed countries but developing countries. However, diet and exercise are still major therapies. We discovered endogenous systems maintaining homeostasis of energy metabolism and revealed several neuronal networks among organs to be responsible for the regulation systems.
1) Afferent neuronal signals from adipose tissue regulate appetite and prevent over-eating during obesity development (Cell Metab 2006)
2) Neuronal network from the liver enhances basal metabolic rates to prevent obesity development when energy store is increasing (Science 2006) 3) Neuronal network from the liver suppresses adaptive thermogenesis in brown adipose tissue (Cell Metab 2012).

Targeted Application(s)/Industry

On the basis of these original discoveries, we are aiming at developing new drugs and/or building devices which regulate the inter-organ neuronal networks and hope to conduct collaborative research with a willing company for a practical application to obesity therapy.

Brain Development and Aging Using Large Brain MRI Database

Features

We have revealed relationships among brain structure, brain function, lifestyle, genetic factor, and cognitive function using brain magnetic resonance imaging (MRI) database. The goal of our project is to prevent several diseases and disorders such as dementia by performing personalized medicine using the large brain MRI database.

Targeted Application(s)/Industry

Our research is related with several industrial fields such as food, sleep, and other lifestyle industries. In addition, our research is also related with medical field such as preventing medicine and brain check-up.

Development of Biomedical Micro/Nano Integrated System Using LSI Technology

Features

Semiconductor neural engineering is a discipline that uses semiconductor process/device/circuit technologies to further understand properties of neural systems and to create novel fusion systems of living body and machine.

Targeted Application(s)/Industry

One of the goals in this laboratory is to establish semiconductor neural engineering and develop biomedical micro/nano integrated systems.
Another goal is to educate the next generation of leaders in biomedical engineering through research including:
1. Intelligent Si neural probe and biomedical signal processing LSI
2. Fully-implantable retinal prosthesis system
3. Bio/nano technology and novel Bio-FET sensor
4. 3-dimensional integration technology and analog/digital LSI design

Creation of cancer cell specific oligonucleotide therapeutics

Features

Focusing our reseach interest mostly on the recognition and complexation behavior control of bioplymrs, such as DNA/RNA, proteines and so on. Another topics are reaction control based on molecular recognition phenomena in both ground and electronically excited states, we are pursuing mechanistic and synthetic studies on asymmetric photochemistry with supramolecular biopolymers as chiral reaction fields.

Targeted Application(s)/Industry