• 한국물환경학회지
• /
• 제33권5호
• /
• pp.556-562
• /
• 2017

Heavy metals in water systems are being managed on the concentration-based guidelines in Korea. However, various chemicals present in water can interact with heavy metals affecting their toxicity. Such interactions are not considered in the concentration-based guidelines. This study investigated the effect of hardness and coexisting heavy metals on heavy metal toxicity to emphasize the importance of having the effect-based guidelines together with the concentration-based guidelines in water management. The toxic effects of Cd, Zn, or mixtures of Cd and Zn were studied with Daphnia magna as a test species following the standard test method at different hardness conditions (100, 200, and $300mg\;L^{-1}$ as $CaCO_3$). The toxicities of single metal solutions and mixtures showed a decreasing trend with increasing hardness, and this can be attributed to the competition between heavy metals and cations such as calcium ions ($Ca^{2+}$) that cause hardness. The predicted toxicities of the heavy metal mixtures from the single metal toxicity deviated from the measured toxicities, and the predicted toxic effects tend to be greater than the measured toxic effects suggesting that Cd and Zn are in competition. This shows the limitations of using predicted toxic effects and the needs for further studies on mixture toxicities. Overall, this study shows that the management of heavy metals in waters needs to employ the effect-based guidelines together with the concentration-based guidelines.

• 대한본초학회지
• /
• 제27권6호
• /
• pp.77-81
• /
• 2012

Objectives : The purpose of this research was to examine the oriental medical term 'Yukjin(in chinese, liuchen)' i.e. 'good long-term storage of the six oriental medicinal herbs'. Yukjin has meant the six sorts of drugs which were well known for the older they stored, the better efficacious they were. This research was carried out to obtain more conclusive information about the time and the reason of the giving a naming Yukjin, and to arrange Yukjin's properties, toxicities and processes. Methods : We investigated the documents recorded in the medical classics of Yukjin and did the current issues and recent experimental researches of these medicines. Results : 1. The properties and flavors of Yukjin are pungent and bitter. When they were stored for a long time after gathering, their toxicities and stimuli were growing thinner, regarded as positive clinically with age and they should be used after processing. 2. The efficacies of Yukjin are not always in proportion to storage period. In case, they are stored too long, their efficacies and qualities may be deteriorated though volatility or pungent flavors are enfeebled. Conclusions : Consequently, toxicities and strong flavors of Yukjin can be reduced in various processes. So the traditional theory of long-term preservation is not necessarily retained. It may be desirable to store them for 1 to 3 years after harvest, to safen their toxicities and adverse reactions in the way of processing. If we use them properly according to oriental medicine method, it will be effective on treating and preventing the various diseases.

• 동의생리병리학회지
• /
• 제18권4호
• /
• pp.957-964
• /
• 2004

Herbal medicines are increasingly used to treat various diseases and lots of studies have been reported that they had benefits in treating and preventing of diseases. But organic toxicity is increasingly recognized as herbal medicines become more popular in industrialized countries. Some herbal products potentially benefit people with lots of diseases, however these benefits remain generally unproved in humans, and a greater awareness for potential adverse effects is required. A herb containing a wide variety of, mostly unknown, substances may well include some with unwanted effects. This review focuses on emerging organic toxicities that have been observed associated with various herbal preparations involving the liver, kidney, and heart, and patterns of organ injury, potential risk factors for organic toxicities. In addition to the potential for organic toxicities, drug drug interactions between herbal medicines and conventional agents may affect the efficacy and safety of concurrent medical therapy. Appropriate reporting and regulatory system to monitor herbal toxicity are required, in conjunction with ongoing scientific evaluation of the potential benefits of phytotherapy.

• Journal of Radiation Protection and Research
• /
• 제8권2호
• /
• pp.1-7
• /
• 1983

S-2-($\omega-aminoethylamino) ethyl dihydrogen phosphorothioate, S-2-($\omega-aminopropylamino) ethyl dihydrogen phosphorothioate를 입수하기 용이한 출발화합물로부터 간편한 방식으로 합성하였다. 이들의 Isothiuronium 유도체들도 합성하였다. Isothiuroniu, 유도체들은 AET보다도 극심한 약독을 나타냈으며 이 약독은 분자내전위반응에 따른 고리화합물 생성에 기인하는 것으로 해석하였다. phosphorothioate 유도체들은 propyl의 경우 AET나 WR-638보다도우수한 방사성방호효과를 나타내주었으나 해당되는 ethyl유도체는 동일한 약량에서 훨씬 뒤떨어진 방호효과를 보여주었다. 이들 유도체들의 방사성방호효과, 약독 및 화학구조들 사이의 상호관계를 적외선 분광분석결과를 중심으로 하여 논의하였다.

• 생약학회지
• /
• 제15권2호
• /
• pp.108-113
• /
• 1984

The structure of tuguaconitine, MP $196{\sim}198^{\circ}C$, a new diterpene alkaloid isolated from the roots of Aconitum sibiricum P., was studied. Its empirical formula is $C_{23}H_{35}NO_7$ and spectroscopic evidence shows that the base contains three methoxyl, three hydroxyl and one N-ethyl groups. The acute toxicities of most of Aconitum species were strong and the acute toxicity of the alkaloid fraction of A. sibiricum was decreased by Glycyrrhizae, black bean or Zingiberis extract.

• 약학회지
• /
• 제31권1호
• /
• pp.19-24
• /
• 1987

In order to find out the pharmacologically active but less toxic compounds than piperine, the actions of several amide derivatives of 5-phenyl-2, 4-pentadienoic acid on the CNS depressant activities were examined. The nine amide derivatives were investigated by using ICR mice as an experimental amimals on acute toxicities, anticonvulsant, sedative, analgesic and antipyretic effects. In the case of acute toxicities, all derivatives were weaker than piperine except compound III. Compound I showed strong anticonvulsant activity. On the other hand, compound I, III and IV significantly prolonged the sleeping time induced by hexobarbital in mice. Compound I, III and IV exhibited better analgesic effect than aspirin while compound II, V, VII and IX showed similar antipyretic activity to aspirin.

• 상하수도학회지
• /
• 제21권3호
• /
• pp.279-285
• /
• 2007

Toxicity evaluations using oxygen uptake rate (OUR) on activated sludge process were investigated. On toxicity evaluations of heavy metals, all toxicants in experiments decreased OUR with respect to the concentrations of the toxicants, while high toxicities with cyanide and mercury were observed respectively. On toxicity evaluations of composite heavy metals, composite toxicities had similar results as to the total sum of each toxicants that presents accurate toxicity evaluation using OUR. From these results, it is concluded that activated sludge is effective indicator for toxicity evaluation on wastewater of biological treatment plants.

• Journal of Korean Neurosurgical Society
• /
• 제61권3호
• /
• pp.386-392
• /
• 2018

Radiation therapy is highly effective for the management of pediatric malignant central nervous system (CNS) tumors including embryonal tumors. With the increment of long-term survivors from malignant CNS tumors, the radiation-related toxicities have become a major concern and we need to improve the treatment strategies to reduce the late complications without compromising the treatment outcomes. One of such strategies is to reduce the radiation dose to craniospinal axis or radiation volume and to avoid or defer radiation therapy until after the age of three. Another strategy is using particle beam therapy such as proton beams instead of photon beams. Proton beams have distinct physiologic advantages over photon beams and greater precision in radiation delivery to the tumor while preserving the surrounding healthy tissues. In this review, I provide the treatment principles of pediatric CNS embryonal tumors and the strategic improvements of radiation therapy to reduce treatment-related late toxicities, and finally introduce the increasing availability of proton beam therapy for pediatric CNS embryonal tumors compared with photon beam therapy.

• Journal of Applied Biological Chemistry
• /
• 제58권2호
• /
• pp.105-108
• /
• 2015

This research is aimed at evaluating the potential abilities of the natural acaricide of F. suspense oil against Tyrophagus putrescentiae and Dermatophagoides spp. Based on the $LD_{50}$ values, in contact bioassay, F. suspense oil (8.19, 3.28, and $4.35{\mu}g/cm^2$) showed acaricidal effects against T. putrescentiae, D. farinae, and D. pteronyssinus, respectively. Fumigant toxicities of F. suspense oil showed similar patterns as those observed with contact toxicities. GC/MS analysis showed the major components of F. suspense oil to be ${\beta}$-pinene (45.88%), myrtenol (13.86%), (+)-${\alpha}$-pinene (13.09%), (-)-trans-pinocarveol (7.34%), sabinene (6.64%) and pinocarvone (4.13%). These findings indicate that F. suspense oil has potential as a natural acaricide.

• 한국환경보건학회지
• /
• 제40권4호
• /
• pp.294-303
• /
• 2014

Objectives: Excretion and tissue distribution of titanium oxide nanoparticles were evaluated in rats after oral administration. The relation between toxicity and systemic concentration of nanoparaticles was investigated. Methods: Rats were orally treated with titanium oxide nanoparticles (10, 100 mg/kg) for five consecutive days. General toxicity, blood chemistry, and serum biochemical analysis were analyzed. Titanium concentration in liver, kidney, lung, urine and feces were measured and histopathology was performed in these organs. Results: Induction of toxicological parameters was not observed and titanium nanoparticles were excreted via feces. Conclusion: Absorption of titanium oxide nanoparticles via the gastrointestinal tract after oral administration was very poor and systemic concentration of titanium oxide nanoparticles was not elevated. Titanium oxide nanoparticles did not cause toxicities in rats after oral administration.