Patents by Inventor Isao Kitajima

Isao Kitajima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11732311
    Abstract: The improved Tm mapping method using imperfect-match linear long quenching probes can accurately distinguish among and identify microorganisms at least at the genus level and often at the species level even in a real-time PCR instrument having measurement errors of Tm values between PCR tubes within ±0.5° C. Therefore, the Tm mapping method can be performed in almost all real-time PCR instruments and can identify unspecified infection-causing pathogenic microorganisms in about 4 hours after sample collection.
    Type: Grant
    Filed: June 19, 2020
    Date of Patent: August 22, 2023
    Inventors: Hideki Niimi, Shinya Otsuki, Isao Kitajima
  • Publication number: 20210102239
    Abstract: A method for enabling rapid and accurate determination of the number of bacterial cells in a specimen using a PCR method includes the following steps: (1) a first PCR step of carrying out a PCR method using a nucleic acid derived from a specimen as a template and a universal primer pair for amplifying a bacterial 16S rRNA gene to obtain a first amplification product; (2) a second PCR step of carrying out a nested PCR method using a primer pair(s) for amplifying an internal sequence(s) of the sequence of the first amplification product obtained by the first PCR step to obtain a second amplification product; and (3) a bacterial number determination step of obtaining the number of bacterial cells in the specimen based on the amount of the second amplification product obtained in the second PCR step and using calibration data.
    Type: Application
    Filed: June 21, 2018
    Publication date: April 8, 2021
    Applicants: MITSUI CHEMICALS, INC., NATIONAL UNIVERSITY CORPORATION UNIVERSITY OF TOYAMA
    Inventors: Hideki Niimi, Isao Kitajima, Akio MIYAKOSHI, Yoshitsugu HIGASHI
  • Publication number: 20210032686
    Abstract: The improved Tm mapping method using imperfect-match linear long quenching probes can accurately distinguish among and identify microorganisms at least at the genus level and often at the species level even in a real-time PCR instrument having measurement errors of Tm values between PCR tubes within ±0.5° C. Therefore, the Tm mapping method can be performed in almost all real-time PCR instruments and can identify unspecified infection-causing pathogenic microorganisms in about 4 hours after sample collection.
    Type: Application
    Filed: June 19, 2020
    Publication date: February 4, 2021
    Inventors: Hideki NIIMI, Shinya OTSUKI, Isao KITAJIMA
  • Publication number: 20210002708
    Abstract: A primer set useful for further improvement of sensitivity in detection or identification of bacterial species in a sample by a PCR method, a kit for PCR using the primer set and a method of detection or identification of bacterial species in a sample using the primer set. Sensitivity in detection or identification of bacterial species in a sample by conducting a PCR method using the primer set with a minimized contamination amount of bacterial nucleic acid is improved. The primer set includes at least one primer pair in seven primer pairs obtained by selecting one primer pair from each of Groups S1 to S7 consisting of specific primers. In addition, the kit for detection of bacterial species includes at least one primer pair in seven primer pairs obtained by selecting one primer pair from each of Groups K1 to K7 consisting of specific primers.
    Type: Application
    Filed: August 11, 2020
    Publication date: January 7, 2021
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Koh AMANO, Tomomi SAKAI, Hisaaki YANAI, Homare TABATA, Hiroshi MINAMI, Isao KITAJIMA, Hideki NIIMI
  • Publication number: 20200355588
    Abstract: A method of pretreating a blood sample for measuring ATP of a pathogenic microorganism in blood, comprising: preparing a pellet of platelets and the pathogenic microorganism from the blood sample; and subjecting the pellet of platelets and the pathogenic microorganism to the following steps (A) to (C) in any order (including multiple simultaneous steps). A method of pretreating a cultured blood sample, wherein the method is a simplified method, does not comprise the following step (A), and comprises the steps (B) and (C) only simultaneously performed. (A) digesting cell membrane proteins of the platelets with a protease; (B) swelling the platelets in a hypotonic solution; and (C) disrupting cell membranes of the platelets with a detergent solution under a condition of suppressing an effect on the pathogenic microorganism.
    Type: Application
    Filed: May 14, 2020
    Publication date: November 12, 2020
    Inventors: Hideki NIIMI, Kazushige SUGIE, Isao KITAJIMA, Tomohiro UENO, Atsushi MATSUI
  • Patent number: 10619182
    Abstract: When bacteria growth is determined in the related art using an ATP method, the bacteria growth is determined, based on an increase or a decrease in live bacteria ATP with the lapse of a culture time. Accordingly, it is necessary to measure the live bacteria ATP multiple times while antimicrobial susceptibility culture is carried out. It takes time and labor in sample preparation for each measurement, and it is difficult to quickly obtain an antimicrobial susceptibility result. Therefore, according to the present invention, the presence or absence of antimicrobial susceptibility of bacteria is determined, based on an ATP luminescence amount derived from dead bacteria in a culture liquid.
    Type: Grant
    Filed: December 26, 2014
    Date of Patent: April 14, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Hiroko Tada, Hideyuki Noda, Hideki Niimi, Isao Kitajima
  • Patent number: 10501813
    Abstract: Disclosed is a thermostable DNA polymerase preparation which can illimitably reduce the risk of false positivity in the detection of a subject microorganism utilizing a gene amplification reaction and therefore enables the selective amplification of DNA for detecting the subject microorganism even when the amount of the subject microorganism is small and therefore the amount of DNA collected therefrom is extremely small, and can be produced at a reduced cost. Also disclosed is a method for quantifying or quantifying/identifying a subject organism to be detected rapidly, conveniently and with high sensitivity using the preparation of the present invention.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: December 10, 2019
    Assignees: HOKKAIDO MITSUI CHEMICALS INC., NATIONAL UNIVERSITY CORPORATION UNIVERSITY OF TOYAMA
    Inventors: Homare Tabata, Hiroshi Minami, Hideki Niimi, Isao Kitajima, Tomohiro Ueno, Shiroh Hayashi, Masashi Mori
  • Publication number: 20180057860
    Abstract: Disclosed is a thermostable DNA polymerase preparation which can illimitably reduce the risk of false positivity in the detection of a subject microorganism utilizing a gene amplification reaction and therefore enables the selective amplification of DNA for detecting the subject microorganism even when the amount of the subject microorganism is small and therefore the amount of DNA collected therefrom is extremely small, and can be produced at a reduced cost. Also disclosed is a method for quantifying or quantifying/identifying a subject organism to be detected rapidly, conveniently and with high sensitivity using the preparation of the present invention.
    Type: Application
    Filed: August 28, 2017
    Publication date: March 1, 2018
    Applicants: Hokkaido Mitsui Chemicals Inc., National University Corporation University of Toyama
    Inventors: Homare Tabata, Hiroshi Minami, Hideki Niimi, Isao Kitajima, Tomohiro Ueno, Shiroh Hayashi, Masashi Mori
  • Publication number: 20170314057
    Abstract: When bacteria growth is determined in the related art using an ATP method, the bacteria growth is determined, based on an increase or a decrease in live bacteria ATP with the lapse of a culture time. Accordingly, it is necessary to measure the live bacteria ATP multiple times while antimicrobial susceptibility culture is carried out. It takes time and labor in sample preparation for each measurement, and it is difficult to quickly obtain an antimicrobial susceptibility result. Therefore, according to the present invention, the presence or absence of antimicrobial susceptibility of bacteria is determined, based on an ATP luminescence amount derived from dead bacteria in a culture liquid.
    Type: Application
    Filed: December 26, 2014
    Publication date: November 2, 2017
    Inventors: Hiroko TADA, Hideyuki NODA, Hideki NIIMI, Isao KITAJIMA
  • Publication number: 20160257999
    Abstract: Disclosed is a thermostable DNA polymerase preparation which can illimitably reduce the risk of false positivity in the detection of a subject microorganism utilizing a gene amplification reaction and therefore enables the selective amplification of DNA for detecting the subject microorganism even when the amount of the subject microorganism is small and therefore the amount of DNA collected therefrom is extremely small, and can be produced at a reduced cost. Also disclosed is a method for quantifying or quantifying/identifying a subject organism to be detected rapidly, conveniently and with high sensitivity using the preparation of the present invention.
    Type: Application
    Filed: December 15, 2015
    Publication date: September 8, 2016
    Applicants: Hokkaido Mitsui Chemicals Inc., National University Corporation University of Toyama
    Inventors: Homare Tabata, Hiroshi Minami, Hideki Niimi, Isao Kitajima, Tomohiro Ueno, Shiroh Hayashi, Masashi Mori
  • Publication number: 20160244812
    Abstract: A primer set useful for further improvement of sensitivity in detection or identification of bacterial species in a sample by a PCR method, a kit for PCR using the primer set and a method of detection or identification of bacterial species in a sample using the primer set. Sensitivity in detection or identification of bacterial species in a sample by conducting a PCR method using the primer set with a minimized contamination amount of bacterial nucleic acid is improved. The primer set includes at least one primer pair in seven primer pairs obtained by selecting one primer pair from each of Groups S1 to S7 consisting of specific primers. In addition, the kit for detection of bacterial species includes at least one primer pair in seven primer pairs obtained by selecting one primer pair from each of Groups K1 to K7 consisting of specific primers.
    Type: Application
    Filed: October 7, 2014
    Publication date: August 25, 2016
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Koh AMANO, Tomomi SAKAI, Hisaaki YANAI, Homare TABATA, Hiroshi MINAMI, Isao KITAJIMA, Hideki NIIMI
  • Patent number: 9243272
    Abstract: Disclosed is a thermostable DNA polymerase preparation which can illimitably reduce the risk of false positivity in the detection of a subject microorganism utilizing a gene amplification reaction and therefore enables the selective amplification of DNA for detecting the subject microorganism even when the amount of the subject microorganism is small and therefore the amount of DNA collected therefrom is extremely small, and can be produced at a reduced cost. Also disclosed is a method for quantifying or quantifying/identifying a subject organism to be detected rapidly, conveniently and with high sensitivity using the preparation of the present invention.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: January 26, 2016
    Assignees: HOKKAIDO MITSUI CHEMICALS INC., NATIONAL UNIVERSITY CORPORATION UNIVERSITY OF TOYAMA
    Inventors: Homare Tabata, Hiroshi Minami, Hideki Niimi, Isao Kitajima, Tomohiro Ueno, Shiroh Hayashi, Masashi Mori
  • Patent number: 8323898
    Abstract: A system rapidly detects and identifies pathogenic bacteria responsible for infection (particularly septicemia), and selects an appropriate antimicrobial drug. A method according to the present invention for detecting and identifying pathogenic bacteria includes performing gene amplification such as real-time PCR, and analyzing the combination of the melting temperatures (Tm values) determined by gene amplification product melting curve analysis or the difference between the Tm values. Specifically, real-time PCR is performed using 4 to 16 primer sets including 1 to 7 primer sets for the 16S ribosomal RNA of bacteria, 1 to 6 primer sets for the 18S ribosomal RNA of fungi, and one primer set respectively for the spa gene and the mecA gene specific to MRSA, and the combination of the Tm values of the amplification product or the combination of the differences between the Tm values is compared with a database to identify pathogenic bacteria responsible for septicemia.
    Type: Grant
    Filed: August 20, 2008
    Date of Patent: December 4, 2012
    Assignee: National University Corporation University of Toyama
    Inventors: Hideki Niimi, Isao Kitajima
  • Publication number: 20120094296
    Abstract: Disclosed is a thermostable DNA polymerase preparation which can illimitably reduce the risk of false positivity in the detection of a subject microorganism utilizing a gene amplification reaction and therefore enables the selective amplification of DNA for detecting the subject microorganism even when the amount of the subject microorganism is small and therefore the amount of DNA collected therefrom is extremely small, and can be produced at a reduced cost. Also disclosed is a method for quantifying or quantifying/identifying a subject organism to be detected rapidly, conveniently and with high sensitivity using the preparation of the present invention.
    Type: Application
    Filed: January 15, 2009
    Publication date: April 19, 2012
    Applicants: NATIONAL UNIVERSITY CORPORATION UNIVERSITY OF TOYA MA, HOKKAIDO MITSUI CHEMICALS INC.
    Inventors: Homare Tabata, Hiroshi Minami, Hideki Niimi, Isao Kitajima, Tomohiro Ueno, Shiroh Hayashi, Masashi Mori
  • Patent number: 7704968
    Abstract: Antisense oligonucleotides which hybridize with nuclear factor-?B (NF-?B) mRNA and methods of using these oligonucleotides.
    Type: Grant
    Filed: July 30, 2007
    Date of Patent: April 27, 2010
    Assignee: The Scripps Research Institute
    Inventors: Michael I. Nerenberg, Isao Kitajima
  • Patent number: 7655635
    Abstract: Antisense oligonucleotides which hybridize with nuclear factor-?B (NF-?B) mRNA and methods of using these oligonucleotides.
    Type: Grant
    Filed: May 5, 2008
    Date of Patent: February 2, 2010
    Assignee: The Scripps Research Institute
    Inventors: Michael I. Nerenberg, Isao Kitajima
  • Publication number: 20090061446
    Abstract: A system rapidly detects and identifies pathogenic bacteria responsible for infection (particularly septicemia), and selects an appropriate antimicrobial drug. A method according to the present invention for detecting and identifying pathogenic bacteria includes performing gene amplification such as real-time PCR, and analyzing the combination of the melting temperatures (Tm values) determined by gene amplification product melting curve analysis or the difference between the Tm values. Specifically, real-time PCR is performed using 4 to 16 primer sets including 1 to 7 primer sets for the 16S ribosomal RNA of bacteria, 1 to 6 primer sets for the 18S ribosomal RNA of fungi, and one primer set respectively for the spa gene and the mecA gene specific to MRSA, and the combination of the Tm values of the amplification product or the combination of the differences between the Tm values is compared with a database to identify pathogenic bacteria responsible for septicemia.
    Type: Application
    Filed: August 20, 2008
    Publication date: March 5, 2009
    Applicant: National University Corporation University of Toyama
    Inventors: Hideki NIIMI, Isao KITAJIMA
  • Publication number: 20080274995
    Abstract: Antisense oligonucleotides which hybridize with nuclear factor-?B (NF-?B) mRNA and methods of using these oligonucleotides.
    Type: Application
    Filed: May 5, 2008
    Publication date: November 6, 2008
    Inventors: Michael I. Nerenberg, Isao Kitajima
  • Publication number: 20080081795
    Abstract: Antisense oligonucleotides which hybridize with nuclear factor-?B (NF-?B) mRNA and methods of using these oligonucleotides.
    Type: Application
    Filed: July 30, 2007
    Publication date: April 3, 2008
    Inventors: Michael Nerenberg, Isao Kitajima
  • Patent number: 7268121
    Abstract: Antisense oligonucleotides which hybridize with nuclear factor-?B(NF-?B) mRNA and methods of using these oligonucleotides.
    Type: Grant
    Filed: December 24, 2002
    Date of Patent: September 11, 2007
    Assignee: The Scripps Research Institute
    Inventors: Michael I. Nerenberg, Isao Kitajima