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N. Koyama · SciRah

Researcher profile · Semantic Scholar

N. Koyama

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N. Koyama — researcher profile on SciRah

h-index: 14
Works: 55
Citations: 690

Most-cited papers

Phenotypic Spectrum of COL4A1 Mutations: Porencephaly to Schizencephaly
Yuriko Yoneda, K. Haginoya, M. Kato, H. Osaka +29 more
2013Annals of Neurology160 citations
Semantic Scholar
Biallelic COLGALT1 variants are associated with cerebral small vessel disease
S. Miyatake, Sacha Schneeberger, N. Koyama, K. Yokochi +24 more
2018Annals of Neurology53 citations
Semantic Scholar
Effect of surfactant lavage in a rabbit model of meconium aspiration syndrome
Yoichi Ohama, Yukino Itakura, N. Koyama, H. Eguchi +1 more
1994Acta paediatrica Japonica : Overseas edition41 citations
Semantic Scholar
Management of meconium‐related ileus in very low‐birthweight infants
T. Shinohara, M. Tsuda, N. Koyama
2007Pediatrics International37 citations
Semantic Scholar
Frameshift mutations of the ARX gene in familial Ohtahara syndrome
M. Kato, N. Koyama, M. Ohta, K. Miura +1 more
2010Epilepsia33 citations
Semantic Scholar
Carnitine-Associated Encephalopathy Caused by Long-term Treatment With an Antibiotic Containing Pivalic Acid
Yasuko Makino, Tokio Sugiura, T. Ito, N. Sugiyama +1 more
2007Pediatrics31 citations
Semantic Scholar
Late‐onset circulatory dysfunction of premature infants and late‐onset periventricular leukomalacia
Satoru Kobayashi, S. Fujimoto, N. Koyama, S. Fukuda +6 more
2008Pediatrics International26 citations
Semantic Scholar
Periventricular leukomalacia with late-onset circulatory dysfunction of premature infants: correlation with severity of magnetic resonance imaging findings and neurological outcomes.
Satoru Kobayashi, S. Fujimoto, S. Fukuda, A. Hattori +6 more
2006Tohoku journal of experimental medicine26 citations Open access
Semantic Scholar
ANTENATAL ULTRASONOGRAPHIC APPEARANCE OF A CLOACAL ANOMALY
Y. Ohno, N. Koyama, M. Tsuda, Y. Arii
2000Obstetrics and Gynecology26 citations
Semantic Scholar
Association of Neonatal Thrombocytopenia and Maternal Anti‐HLA Antibodies
N. Koyama, Yoichi Ohama, K. Kaneko, Yukino Itakura +9 more
1991Acta paediatrica Japonica : Overseas edition24 citations
Semantic Scholar
Neurodevelopmental Outcomes at 18 Months’ Corrected Age of Infants Born at 22 Weeks of Gestation
Tokio Sugiura, M. Kouwaki, Yasuko Togawa, Mari Sugimoto +2 more
2011Neonatology20 citations
Semantic Scholar
Effects of pegylated interferon α-2a on hepatitis-C-virus-associated glomerulonephritis
Tokio Sugiura, Takuji Yamada, Yuri Kimpara, N. Fujita +2 more
2009Pediatric nephrology (Berlin, West)18 citations
Semantic Scholar
Laboratory and Epidemiology Communications A Fatal Case of Encephalopathy Possibly Associated with Human Metapneumovirus Infection
Mami Hata, Miyabi Ito, S. Kiyosawa, Yuri Kimpara +8 more
200717 citations
Semantic Scholar
A case of anaphylaxis to erythritol diagnosed by CD203c expression-based basophil activation test.
Shiro Sugiura, Y. Kondo, K. Ito, Akihiko Hashiguchi +2 more
2013Annals of Allergy, Asthma & Immunology16 citations
Semantic Scholar
Acylcarnitine profiles during carnitine loading and fasting tests in a Japanese patient with medium-chain acyl-CoA dehydrogenase deficiency.
K. Yokoi, T. Ito, Yasuhiro Maeda, Y. Nakajima +8 more
2007Tohoku journal of experimental medicine14 citations Open access
Semantic Scholar
Three novel mutations of the PAX6 gene in Japanese aniridia patients
Toshio Kawano, Chunxia Wang, Y. Hotta, Miho Sato +9 more
2007Journal of Human Genetics14 citations
Semantic Scholar
Nemaline myopathy with KLHL40 mutation presenting as congenital totally locked-in state.
Koya Kawase, I. Nishino, Mari Sugimoto, Takao Togawa +5 more
2015Brain & development (Tokyo. 1979)13 citations
Semantic Scholar
Increased platelet activating factor in the tracheal aspirates from neonates with patent ductus arteriosus.
N. Koyama, Y. Ogawa, K. Kamiya, H. Eguchi +5 more
1993Clinica chimica acta; international journal of clinical chemistry13 citations
Semantic Scholar
A case of systemic aplasia cutis congenita: a newly recognized syndrome?
Tokio Sugiura, M. Kouwaki, S. Kiyosawa, Y. Sasada +3 more
2008European Journal of Pediatrics11 citations
Semantic Scholar
Surfactant Apoprotein A (SP‐A) in Tracheal Aspirates of Newborn Infants with RDS
H. Eguchi, N. Koyama, Taihei Tanaka, K. Kamiya +1 more
1991Acta paediatrica Japonica : Overseas edition11 citations
Semantic Scholar
Echovirus Type 7 Virus-Associated Hemophagocytic Syndrome in a Neonate Successfully Treated With Intravenous Immunoglobulin Therapy: A Case Report
Yuka Watanabe, T. Sugiura, Mari Sugimoto, Yasuko Togawa +3 more
2019Frontiers in Pediatrics8 citations Open access
Semantic Scholar
Neurodevelopmental outcomes at 3 years old for infants with birth weights under 500 g.
Syunsuke Nagara, M. Kouwaki, Takao Togawa, Tokio Sugiura +2 more
2017Pediatrics and Neonatology8 citations Open access
Semantic Scholar
IgE-dependent mechanism and successful desensitization of erythritol allergy.
Shiro Sugiura, Y. Kondo, I. Tsuge, T. Nakagawa +3 more
2016Annals of Allergy, Asthma & Immunology7 citations
Semantic Scholar
Hypoxic ischemic encephalopathy in a case of intranuclear rod myopathy without any prenatal sentinel event.
Koya Kawase, I. Nishino, Mari Sugimoto, M. Kouwaki +2 more
2015Brain & development (Tokyo. 1979)7 citations
Semantic Scholar
Single nucleotide polymorphisms in AGTR1, TFAP2B, and TRAF1 are not associated with the incidence of patent ductus arteriosus in Japanese preterm infants
Koya Kawase, Tokio Sugiura, Y. Nagaya, Takaharu Yamada +8 more
2016Pediatrics International6 citations
Semantic Scholar
Cytokine Profiles Before and After Exchange Transfusion in a Neonate With Transient Myeloproliferative Disorder and Hepatic Fibrosis
Tokio Sugiura, K. Goto, T. Ninchoji, Kaori Aiba +3 more
2010Journal of pediatric hematology/oncology6 citations
Semantic Scholar
Elevated platelet activating factor in the tracheal aspirate at birth and signs of intra-uterine inflammation in infants with neonatal pulmonary emphysema
N. Koyama, Y. Ogawa
1999European Journal of Pediatrics6 citations
Semantic Scholar
DOOR syndrome concomitant with non-convulsive status epilepticus and hyperintense cerebellar cortex on T2-weighted imaging.
Takayasu Nomura, N. Koyama, Machiko Yokoyama, A. Awaya +1 more
2009Brain & development (Tokyo. 1979)5 citations
Semantic Scholar
Pulmonary Surfactant Apoprotein‐A in Neonates with Different Respiratory Disorders
H. Nagai, Y. Ogawa, H. Eguchi, K. Kamiya +7 more
1992Acta paediatrica Japonica : Overseas edition5 citations
Semantic Scholar
STANDARDIZED METHODS FOR IN-HOUSE SEPARATION OF A BLOOD PRODUCT FOR MULTIPLE USE
H. Fujita, M. Okuda, A. Ohara, M. Kajiwara +7 more
20164 citations Open access
Semantic Scholar
clinical features of late-onset circulatory dysfunction in premature infants
N. Koyama, M. Kouwaki, Taihei Tanaka, S. Ohki +9 more
20144 citations Open access
Semantic Scholar
Effects of exchange transfusion on cytokine profiles in necrotizing enterocolitis
Tokio Sugiura, M. Kouwaki, K. Goto, T. Endo +3 more
2012Pediatrics International4 citations
Semantic Scholar
Risk Factors for Early Death in Transient Myeloproliferative Disorder Without Phenotypic Features of Down Syndrome: A Case Report and Literature Review
Koya Kawase, E. Azuma, Hironori Ohshita, Tatsushi Tanaka +8 more
2012Journal of pediatric hematology/oncology4 citations
Semantic Scholar
Growth characteristics of nezasa dwarf bamboo (Pleioblastus variegatus Makino), 1: Photosynthesis and utilization of stored nitrogen
N. Koyama, Y. Ogawa
19933 citations
Semantic Scholar
血液製剤の院内分割マニュアル改訂3.0
H. Fujita, Masazumi Ikegami, M. Okuda, Michiko Kajiwara +5 more
2024Japanese Journal of Transfusion and Cell Therapy2 citations Open access
Semantic Scholar
Asymptomatic C‐reactive protein elevation in neutropenic children
Shiro Sugiura, Tsuyoshi Ito, N. Koyama, N. Sasaki +2 more
2017Pediatrics International2 citations Open access
Semantic Scholar
Acylcarnitine Profi les during Carnitine Loading and Fasting Tests in a Japanese Patient with Medium-Chain Acyl-CoA Dehydrogenase Defi ciency
K. Yokoi, T. Ito, Yasuhiro Maeda, Y. Nakajima +8 more
20032 citations
Semantic Scholar
Nusinersen helps restore walking ability in childhood spinal muscular atrophy
Mari Sugimoto, Kaori Aiba, N. Koyama, K. Yokochi +1 more
2019Pediatrics International1 citations
Semantic Scholar
EVIDENCE BASED PEDIATRIC TRANSFUSION GUIDELINE
J. Kitazawa, A. Ohara, H. Azuma, C. Ogawa +6 more
20171 citations Open access
Semantic Scholar
A case of pediatric multiple sclerosis presenting with a tumefactive demyelinating lesion.
Hisakazu Majima, Tsuyoshi Ito, N. Koyama
2017Rinshō shinkeigaku Clinical neurology1 citations Open access
Semantic Scholar
Granulocyte elastase α1‐proteinase inhibitor complex measurement in very low birthweight infants with severe intraventricular hemorrhage
Jiro Takasaki, K. Kamiya, Y. Ogawa, Taihei Tanaka +1 more
1993Acta paediatrica Japonica : Overseas edition1 citations
Semantic Scholar
IN-HOUSE SEPARATION IN A NATIONWIDE QUESTIONNAIRE SURVEY ON TRANSFUSION MEDICINE IN FISCAL YEAR 2018
H. Fujita, M. Okuda, Michiko Kajiwara, N. Koyama +5 more
2021Japanese Journal of Transfusion and Cell Therapy0 citations Open access
Semantic Scholar
Breakthrough HBV infection in a vaccinated child due to vaccine escape mutant
Takanori Ohta, Koichi Ito, Tokio Sugiura, N. Koyama +3 more
2021Kanzo0 citations Open access
Semantic Scholar
GUIDELINES FOR PRE-TRANSFUSION COMPATIBILITY PROCEDURES IN BLOOD TRANSFUSION LABORATORIES IN JAPAN (3rd EDITION)
M. Okuda, Junko Ikemoto, K. Ishimaru, M. Uchikawa +9 more
2020Japanese Journal of Transfusion and Cell Therapy0 citations Open access
Semantic Scholar
STANDARDIZED METHODS FOR IN-HOUSE SEPARATION OF A BLOOD PRODUCT FOR MULTIPLE USE VERSION 2.0
H. Fujita, M. Okuda, M. Kajiwara, N. Koyama +6 more
2020Japanese Journal of Transfusion and Cell Therapy0 citations Open access
Semantic Scholar
STANDARDIZED METHODS OF POTASSIUM ADSORPTION FILTER FOR IN-HOUSE SEPARATION OF A BLOOD PRODUCT FOR MULTIPLE USE
H. Fujita, S. Igarashi, M. Okuda, M. Kajiwara +7 more
2019Japanese Journal of Transfusion and Cell Therapy0 citations Open access
Semantic Scholar
A case report of mitochondrial respiratory chain disorder in the neonatal period for which home mechanical ventilation was introduced.
Mari Sugimoto, Takao Togawa, Kaori Aiba, N. Koyama +3 more
2017No to hattatsu = Brain and development0 citations
Semantic Scholar
A case report of mitochondrial respiratory chain disorder in the neonatal period for which home mechanical ventilation was introduced
Mari Sugimoto, Takao Togawa, Aiba Kaori, N. Koyama +3 more
20170 citations
Semantic Scholar
IgE-Dependent Mechanism and Successful Desensitization of Erythritol Allergy
Shiro Sugiura, Y. Kondo, I. Tsuge, T. Nakagawa +3 more
20160 citations Open access
Semantic Scholar
Esophageal stenosis due to vascular ring.
K. Yasuda, N. Koyama, H. Murayama, Takashi Watanabe
2007Jornal de Pediatria0 citations
Semantic Scholar

Frequent co-authors

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M. Kouwaki×11
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M. Kouwaki — researcher profile on SciRah
Tokio Sugiura×10
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Tokio Sugiura — researcher profile on SciRah
Mari Sugimoto×9
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Mari Sugimoto — researcher profile on SciRah
K. Yokochi×8
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K. Yokochi — researcher profile on SciRah

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Taihei Tanaka — researcher profile on SciRah

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Y. Ogawa — researcher profile on SciRah

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H. Togari — researcher profile on SciRah

Takao Togawa×7

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Takao Togawa — researcher profile on SciRah

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M. Okuda — researcher profile on SciRah

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S. Hosono — researcher profile on SciRah

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H. Eguchi — researcher profile on SciRah

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K. Kamiya — researcher profile on SciRah