Judul: Wavy Sycamore Maple: Relationships Between Anatomical, Physical, Mechanical, And Vibrational Properties
Abstrak: Sycamore maple (Acer pseudoplatanus L.) is a wood species particularly known for its wavy grain figures and its high-value utilization among luthiers and craftsmen for musical instruments or furniture making. Although past separate studies had determined its properties, little had been done in order to quantify the waviness characteristics of its unique patterns and the correlations between its properties which include the anatomical, physical, mechanical, and vibrational or acoustical characteristics. Backed by its high degree of valuation and utilization, this research was conducted in order to study the characteristics of sycamore maple and how they correlate with each other. The specimens taken for the measurements were procured from different trees with various surface figures. Vibrational and mechanical measurements were conducted using Vybris, a semi-automated device developed by Gifu and Kyoto University, Japan and manufactured in LMGC (Laboratoire de Mécanique et Génie Civil) in Montpellier, France by taking into account the radial and longitudinal directions and its local variations. Waviness’ characteristics were quantified by measuring the wood blocks which were splitted parallel to the grain, while anatomical properties such as microfibril angle and rays’ dimensions were measured using light microscopy. Results from this study provide a dataset regarding the properties of wavy sycamore maple. Through statistical analysis, it can be concluded that there are significant correlations between the measured parameters, particularly between waviness, microfibril angle, the specific modulus elasticity, and damping coefficient by internal friction of the wood in longitudinal direction. The anisotropy properties were found to be very low but was not satisfactorily explained by the anatomical features studied. Future studies using similar methods should be conducted with larger number of speciments and refined statistical analysis models. Analysis regarding the mechanical model of wavy-grain wood, which may include variables such as MFA, grain angle, and waviness, should be conducted.
Keyword: anisotropy, damping, microfibril angle, modulus of elasticity, rays, wavy grain

Judul: Wavy Sycamore Maple: Relationships Between Anatomical, Physical, Mechanical, And Vibrational Properties
Abstrak: Sycamore maple (Acer pseudoplatanus L.) is a wood species particularly known for its wavy grain figures and its high-value utilization among luthiers and craftsmen for musical instruments or furniture making. Although past separate studies had determined its properties, little had been done in order to quantify the waviness characteristics of its unique patterns and the correlations between its properties which include the anatomical, physical, mechanical, and vibrational or acoustical characteristics. Backed by its high degree of valuation and utilization, this research was conducted in order to study the characteristics of sycamore maple and how they correlate with each other. The specimens taken for the measurements were procured from different trees with various surface figures. Vibrational and mechanical measurements were conducted using Vybris, a semi-automated device developed by Gifu and Kyoto University, Japan and manufactured in LMGC (Laboratoire de Mécanique et Génie Civil) in Montpellier, France by taking into account the radial and longitudinal directions and its local variations. Waviness’ characteristics were quantified by measuring the wood blocks which were splitted parallel to the grain, while anatomical properties such as microfibril angle and rays’ dimensions were measured using light microscopy. Results from this study provide a dataset regarding the properties of wavy sycamore maple. Through statistical analysis, it can be concluded that there are significant correlations between the measured parameters, particularly between waviness, microfibril angle, the specific modulus elasticity, and damping coefficient by internal friction of the wood in longitudinal direction. The anisotropy properties were found to be very low but was not satisfactorily explained by the anatomical features studied. Future studies using similar methods should be conducted with larger number of speciments and refined statistical analysis models. Analysis regarding the mechanical model of wavy-grain wood, which may include variables such as MFA, grain angle, and waviness, should be conducted.
Keyword: anisotropy, damping, microfibril angle, modulus of elasticity, rays, wavy grain

Judul: Enteric Collibacillosis Pada Anak Babi Baru Lahir: Patogenesa dan Perubahan-Perubahan Patologisnya
Abstrak: Diare disebabkan oleh infeksi bakteri Escherichia coli pada anak-anak babi baru lahir yang peka terhadap en terotoksin produk bakteri tersebut. Dikenal sebagai colibacillosis. Patogenesa dari colibacillosis anak babi baru lahir adalah (1) infeksi oleh E. coli patogen, (2) proliferasi E. coli di lumen usus halus, (3) produksi dan pelepasan enterotoksin, dan (4) aktifitas toksin pada usus halus. Dalam proses proliferasi, adanya antigen pili K88 sangat penting karena memungkinkan bakteri perlekatan dengan epitel mucosa usus halus. mengadakan Setelah ko lonisasi dan proliferasi segera toksin dilepaskan. Akti- fitas toksin menginduksi sekresi yang berlebihan dari u- sus sehingga banyak cairan yang dikeluarkan ke lumen usus. Hal ini mengakibatkan banyak cairan dan elektrolit hilang sehingga timbul diare, dehidrasi dan asidosis yang sering menyebabkan kematian. Perubahan-perubahan patologis yang umum adalah dis tensi usus halus, dilatasi lambung dan infark pada kurva- tura mayor. Perubahan-perubahan histologis yang terjadi adalah enteritis hemorrhagica acuta, oedem dan kongesti pembuluh darah di lamina propria, akumulassi leukosit inti polimorf, sel monosit, dan inti sel mengalami piknosis Thrombus pada vena dan degenerasi serta desquamasi sel epitel usus….
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