Biography:

In the past Koichi Fukuda has collaborated on articles with Tsuyoshi Iwasaka and Takahiro Fujino. One of their most recent publications is On the photolysis of alkylated naphthalenes in aquatic systems. Which was published in journal Chemosphere.

More information about Koichi Fukuda research including statistics on their citations can be found on their Copernicus Academic profile page.

Koichi Fukuda's Articles: (9)

On the photolysis of alkylated naphthalenes in aquatic systems

AbstractThe photodegradability in aquatic systems of some alkylated naphthalenes and related compounds was studied using a high-pressure mercury lamp. The rate constant and half-life of their degradation were estimated in distilled water. From the results performed in artificial seawater, which served as a marine environmental model, the rate of photolysis of alkylated naphthalenes increased several times over that in distilled water. This was especially observed for naphthalene. Therefore, sodium chloride, the main component of seawater, was estimated to be the cause of the enhancement, because the rate increased nearly proportionally to the concentration of NaCl in the system, with a correlation coefficient of 0.995 for 2-isopropylnaphthalene.

Regular articleAntitumor effects of human recombinant interferon-γ and tumor necrosis factor on five cervical adenocarcinoma cell lines, in vivo and in vitro

AbstractWe examined the antitumor effects of recombinant interferonγ (IFN-γ) and tumor necrosis factor (TNF) on cervical adenocarcinoma cell lines, in vitro and in vivo. Four of five cell lines showed a high sensitivity to IFN-γ, in vitro. One of five cell lines showed a remarkable sensitivity to TNF, in vitro. Only one cell line resistant to both IFN and TNF was derived from a welldifferentiated adenocarcinoma of endocervical type. Experiments using nude mice bearing transplanted tumors revealed that these cytokines were also effective against tumors in vivo. All these observations suggest that IFN-γ or TNF can have positive effects in the treatment of patients with adenocarcinoma of the uterine cervix.

Two types of parenchymal cells in the lung fluke Paragonimus ohirai (digenea: Troglotrematidae) characterized by the cytochemistry of their mitochondria

AbstractMorphology and respiratory function were studied in situ and in the isolated mitochondria of Paragonimus ohirai. Two types of parenchymal cells (i.e., Pcl and Pc2 cells), whose mitochondria differ in terms of morphology and staining for cytochrome c oxidase activity, were found in fluke tissues. Enzymatic and spectrophotometric analyses of the isolated mitochondria showed that fluke mitochondria possess both aerobic and anaerobic respiratory chains. These results suggest that there are two mitochondrial populations in fluke parenchymal cells, one possessing an aerobic respiratory chain and the other an anaerobic respiratory chain.

Improvement of epitaxial channel quality on heavily arsenic- and boron-doped Si surfaces and impact on performance of tunnel field-effect transistors

AbstractWe evaluate the impact of tunnel junction quality on the performance of tunnel field-effect transistors (TFETs). The interface between epitaxially grown channel and source surface was used as tunnel junctions. Performing a sequential surface cleaning procedure prior to epitaxial channel growth for heavily arsenic- and boron-doped Si surfaces improved the interface quality both for p- and n-TFETs. Simultaneously, the subthreshold swing (SS) values of the TFETs improved step-by-step with interface quality.

Regular ArticleNeoadjuvant Chemotherapy with Mitomycin C, Etoposide, and Cisplatin for Adenocarcinoma of the Cervix☆

AbstractBetween May 1990 and February 1995, 16 patients with adenocarcinoma or adenosquamous carcinoma of the uterine cervix were prescribed neoadjuvant chemotherapy consisting of cisplatin (50 mg/m2) on day 1, mitomycin C (10 mg/m2) on day 1, and etoposide (100 mg/m2) on days 1, 3, and 5 (MEP). In 2 patients stage was IB1, 5 were in stage IB2, 1 was in stage IIA, 5 were in stage IIB, 2 were in stage IIIB, and one was in stage IVB. A median of three courses of chemotherapy was given (range two to five). Of the 16 patients, 3 had a complete response and 5 had a partial response (response rate, 50%). Following termination of this chemotherapy, 12 patients with stage I or stage II carcinoma underwent radical hysterectomy. Three were given adjuvant radiotherapy because of positive pelvic nodes. One stage IIB patient, 1 stage IIIB patient and 1 stage IVB patient underwent standard radiotherapy and 1 stage IIIB patient underwent chemotherapy with another regimen because MEP therapy was without effect. Histopathological examinations revealed that changes as a result of the chemotherapy correlated well with clinical responses. Moderate or marked pathological changes occurred in 3 with a clinically complete response. The mean survival period of responders was 47.5 months while that of nonresponders was 28.3 months. Side effects of chemotherapy with MEP were within acceptable limits. The dose-limiting toxicity was myelosuppression and for only 1 patient the dose was reduced because of thrombocytopenia. Our preliminary study indicates that this chemotherapy regimen is effective for subjects with adenocarcinoma of the cervix. A prospective cooperative group trial on this regimen is ongoing.

Regular ArticlePreoperative Cervical Cytology in Endometrial Carcinoma and Its Clinicopathologic Relevance

AbstractObjective.The aim of this study was to assess the significance of malignant or suspicious cervical cytology in preoperative identification of poor prognostic factors in endometrial carcinoma and to determine whether preoperative abnormal cervical cytology is an independent prognostic factor for endometrial carcinoma.Methods.We evaluated the correlation between preoperative cervical cytology and postoperative clinicopathologic findings, sites of metastasis, and receptor status from 99 surgically staged patients with endometrial carcinoma.Results.Sixty-eight patients (68.7%) had normal cervical cytology, 1 (1.0%) had atypical cytology suspicious for malignancy, and 30 (30.3%) had malignant cytology on preoperative cervical cytology. Malignant and suspicious cervical smears were statistically correlated with surgical stage (P= 0.001), histopathology (P= 0.010), tumor grade (P= 0.012), depth of myometrial tumor invasion (P= 0.001), cervical involvement (P= 0.01), lymph node metastases (P= 0.002), adnexal metastases (P= 0.012), progesterone receptor (P= 0.007), and estrogen receptor (P= 0.031). No association was found between preoperative cervical cytology and patients' age or peritoneal cytology. Univariate analysis showed that cervical cytology was related to survival (P= 0.018). However, multivariate analysis of cervical cytology, stage, grade, and myometrial invasion showed that preoperative cervical cytology was not a significant prognosticator for survival.Conclusion.Patients with endometrial carcinoma who have malignant or suspicious cytology detected by preoperative cervical cytology are at increased risk of having known poor prognostic factors. However, positive preoperative cervical cytology itself does not appear to be an independent prognostic factor and probably should not influence treatment decisions in endometrial cancer.

Regular ArticlePrognostic Significance of Progesterone Receptor Immunohistochemistry for Lymph Node Metastases in Endometrial Carcinoma

AbstractObjective.The aim of this study was to determine whether progesterone receptor (PR), estrogen receptor (ER), p53 protein, and proliferating cell nuclear antigen (PCNA) expression constitute independent prognostic factors for lymph node metastases in endometrial carcinoma using immunohistochemical techniques on hysterectomy and biopsy specimens.Methods.We evaluated the correlation between lymph node metastases and PR/ER immunohistochemistry, p53/PCNA expression, age, tumor grade, myometrial tumor invasion, cervical involvement, and ovarian metastases in a series of 99 cases of primary endometrial carcinoma surgically staged with systemic pelvic lymphadenectomy and para-aortic lymph node biopsy.Results.Lymph node metastases from endometrial carcinoma were statistically correlated with negative PR immunohistochemistry (P= 0.001), intense p53 expression (66% or more of the tumor cells stained,P= 0.003), deep myometrial tumor invasion (greater than one-half,P= 0.001), and cervical involvement (P= 0.001). Tumor grade showed borderline statistical significance for lymph node metastases (P= 0.058). On multivariate analysis, negative PR, intense p53 expression, and cervical involvement were significant prognostic variables for lymph node metastases (P= 0.0001, 0.0023, and 0.002, respectively). Immunohistochemical study indicated that the PR status on preoperative biopsy specimens and hysterectomy specimens was in good agreement, but p53 status was not. Age, ovarian metastases, ER immunohistochemistry, and PCNA expression were not significantly related to lymph node metastases.Conclusion.PR immunohistochemistry appeared to be the most powerful prognostic factor associated with lymph node metastases in endometrial carcinoma, independent of other clinicopathological parameters.

WITHDRAWN: R&D of a monolithic pixel sensor based on 0.15 μm fully depleted SOI technology

The Publisher regrets that this article is an accidental duplication of an article that will be published in Nucl. Instr. and Meth. A, doi:10.1016/j.nima.2007.07.111. The duplicate article has therefore been withdrawn.

ArticleStructural Basis of von Willebrand Factor Activation by the Snake Toxin Botrocetin

AbstractThe A1 domain of von Willebrand factor (vWF) mediates platelet adhesion to sites of vascular injury by binding to the platelet receptor glycoprotein Ib (GpIb), an interaction that is regulated by hydrodynamic shear forces. The GpIb binding surface of A1 is distinct from a regulatory region, suggesting that ligand binding is controlled allosterically. Here we report the crystal structures of the “gain-of-function” mutant A1 domain (I546V) and its complex with the exogenous activator botrocetin. We show that botrocetin switches the mutant A1 back toward the wild-type conformation, suggesting that affinity is enhanced by augmenting the GpIb binding surface rather than through allosteric control. Functional studies of platelet adhesion under flow further suggest that the activation mechanism is distinct from that of the gain-of-function mutation.

Advertisement
Join Copernicus Academic and get access to over 12 million papers authored by 7+ million academics.
Join for free!

Contact us