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| 1 | Cellulose structure and lignin distribution in normal and compression wood of the Maidenhair tree(Ginkgo biloba L.)显示文摘We studied in detail the mean micro fibril angle and the width of cellulose crystals from the pith to the bark of a 15-year-old Maidenhair tree(Ginkgo biloba L.). The orientation of cellulose micro fibrils with respect to the cell axis and the width and length of cellulose crystallites were determined using Xray diffraction. Raman microscopy was used to compare the lignin distribution in the cell wall of normal/opposite and compression wood, which was found near the pith. Ginkgo biloba showed a relatively large mean micro fibril angle,varying between 19° and 39° in the S2 layer, and the average width of cellulose crystallites was 3.1–3.2 nm. Mild compression wood without any intercellular spaces or helical cavities was observed near the pith. Slit-like bordered pit openings and a heavily lignified S2 L layer con firmed the presence of compression wood. Ginkgo biloba showed typical features present in the juvenile wood of conifers. The micro fibril angle remained large over the 14 annual rings. The entire stem disc,with a diameter of 18 cm, was considered to consist of juvenile wood. The properties of juvenile and compression wood as well as the cellulose orientation and crystalline width indicate that the wood formation of G. biloba is similar to that of modern conifers. | Seppo Andersson Yurong Wang Raili P?nni Tuomas H?nninen Marko Mononen Haiqing Ren Ritva Serimaa Pekka Saranp?? | 2015 | Journal of Integrative Plant Biology2015，57，4： | 5 |
| 2 | Influencing public nutrition for non-communicable disease prevention : from community intervention to national programme-experiences from Finland显示文摘 | Pekka P Pirjo P Ulla U | 2002 | Public Health Nutri2002，5，1： | 1 |
| 3 | Dynamic me- chanical behavior of steam-treated wood显示文摘 | Karenlampi Petri P Tynjala Pekka Strllm Past | 2002 | Mechanics of Materi- als2002，34，6： | 1 |
| 4 | Feature representation and discrimination based on Gaussian mixture model probability densities-practices and algorithms 显示文摘 | PEKKA P JONI K K JARMO I | 2006 | Pattern Recognition2006，39，7： | 1 |
| 5 | Early markers of myocardial injury: cTnI is enough显示文摘 | Tuomo I Juha L Pekka P | 2009 | Clin Chim Acta2009，400，12： | 1 |
| 6 | Patient-controlled sedation with propofol and remifentanil for ERCP: a randomized, controlled study显示文摘 | Maxim Mazanikov Marianne Udd Leena Kyl?np?? Outi Lindstr?m Pekka Aho Jorma Halttunen Martti F?rkkil? Reino P?yhi? | 2011 | Gastrointestinal Endoscopy2011，，2： | 1 |
| 7 | Effect of weld microstructure on brittle fracture initiation in the thermallyaged boiling water reactor pressure vessel head weld metal显示文摘Effects of the weld microstructure and inclusions on brittle fracture initiation are investigated in a thermally aged ferritic high-nickel weld of a reactor pressure vessel head from a decommissioned nuclear power plant.As-welded and reheated regions mainly consist of acicular and polygonal ferrite,respectively.Fractographic examination of Charpy V-notch impact toughness specimens reveals large inclusions(0.5-2.5μm)at the brittle fracture primary initiation sites.High impact energies were measured for the specimens in which brittle fracture was initiated from a small inclusion or an inclusion away from the V-notch.The density,geometry,and chemical composition of the primary initiation inclusions were investigated.A brittle fracture crack initiates as a microcrack either within the multiphase oxide inclusions or from the debonded interfaces between the uncracked inclusions and weld metal matrix.Primary fracture sites can be determined in all the specimens tested in the lower part of the transition curve at and below the 41-J reference impact toughness energy but not above the mentioned value because of the changes in the fracture mechanism and resulting changes in the fracture appearance. | Noora Hytönen Zai-qing Que Pentti Arffman Jari Lydman Pekka Nevasmaa Ulla Ehrnstén Pål Efsing | 2021 | International Journal of Minerals,Metallurgy and Materials2021，28，5： | 1 |
| 8 | Tacit knowledge acquisi- tion and sharing in a project work context显示文摘 | KAJ U K PEKKA P HANNU V | 2003 | Intemational Journal of Project Management2003，21，： | 1 |
| 9 | Lactose modifications enhance its drug performance in the novel multiple dose Taifun DPI 显示文摘 | Pa ivi H Vesa- Pekka L Krista M Eero S Tapio L Petteri P Kristiina J | 2002 | European Journal of Pharmaceutical Sciences2002，16，： | 1 |
| 10 | Tacit Knowledge Acquisition andSharing in a Project Work Context 显示文摘 | Kaj U Pekka P Hannu V | 2003 | International Journal ofProject Management2003，21，28： | 1 |
| 11 | Early markers of myocardial injury: cTnI is enough 显示文摘 | TUOMO I JUHA L PEKKA P | 2009 | Clinica Chimica Acta2009，400，12： | 1 |
| 12 | Coarse woody debris and stand characteristics in mature managed and old-growth boreal mesic forests in Southern Finland显示文摘 | JUHA S PETRI M PEKKA P | 2000 | Forest Ecology and Management2000，128，3： | 1 |
| 13 | Systematic Identification of MicroRNAs That Impact on Proliferation of Prostate Cancer Cells and Display Changed Expression in Tumor Tissue显示文摘 | Anna Aakula Pekka Kohonen Suvi-Katri Leivonen Rami M?kel? Petteri Hintsanen John Patrick Mpindi Elena Martens-Uzunova Tero Aittokallio Guido Jenster Merja Per?l? Olli Kallioniemi P?ivi ?stling | 2015 | European Urology2015，，： | 1 |
| 14 | Degree of Damage to the Small Bowel and Serum Antibody Titers Correlate With Clinical Presentation of Patients With Celiac Disease显示文摘 | Juha Taavela Kalle Kurppa Pekka Collin Marja–Leena L?hdeaho Teea Salmi P?ivi Saavalainen Katri Haimila Heini Huhtala Kaija Laurila Harri Siev?nen Markku M?ki Katri Kaukinen | 2013 | Clinical Gastroenterology and Hepatology2013，，： | 1 |
| 15 | Maternal magnesium sulfate treatment is associated with reduced brain-blood flow perfusion in preterm infants显示文摘 | Tiina Rantonen Pekka K??p? Juhani Gr?nlund Ulla Ekblad Hans Helenius Pentti Kero Ilkka V?lim?ki | 2001 | Critical Care Medicine2001，，7： | 1 |
| 16 | Influencing public nutrion for non-communicable disease prevention:form community intervention to national programme-experiences from Finlanol显示文摘 | Pekka P Purjo P Ulla U | 2002 | Public Health Nutri2002，，： | 1 |
| 17 | Mutations in AXIN2 Cause Familial Tooth Agenesis and Predispose to Colorectal Cancer显示文摘 | Laura Lammi Sirpa Arte Mirja Somer Heikki J?rvinen P?ivi Lahermo Irma Thesleff Sinikka Pirinen Pekka Nieminen | 2004 | The American Journal of Human Genetics2004，，5： | 1 |
| 18 | Modification of ZSM-5 zeolite with trimethyl phosphite part 1, structure and acidity 显示文摘 | Pekka T Tuula T P | 1998 | Microporous and mesoporous materials1998，20，： | 1 |
| 19 | Coarse woody debris and stand characteristics in mature managed and old-growth boreal mesic for- ests in southern Finland 显示文摘 | Juha S Petri M Pekka P | 2000 | Forest Ecology and Management2000，128，： | 1 |
| 20 | Pull-off test in the assessment of adhesion at printed wiring board metallisatiort/epoxy interface显示文摘 | MARKUS P K T PEKKA M MATH P | 2004 | Microelectronics Reliability2004，44，： | 1 |
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