Flame retardance-donated lignocellulose nanofibers (LCNFs) by the Mannich reaction with (amino-1,3,5-triazinyl)phosphoramidates and their properties

Nitrogen/phosphorus-containing melamines (NPCM), a durable flame-retardant, were prepared by the successive treatment of ArOH (Ar = BrnC6H5−n, n = 0, 1, 2, and 3) with POCl3 and melamine monomer. The prepared flame-retardants were grafted through the CH2 unit to lignocellulose nanofibers (LCNFs) by the Mannich reaction. The resulting three-component products were characterized using FT-IR (ATR) and EA. The thermal behavior of the NPCM-treated LCNF fabric samples was determined using TGA and DSC analyses, and their flammability resistances were evaluated by measuring their Limited Oxygen Index (LOI) and the UL-94V test. A multitude of flame retardant elements in the fabric samples increased the LOI values as much as 45 from 20 of the untreated LCNFs. Moreover, the morphology of both the NPCM-treated LCNFs and their burnt fabrics was studied with a scanning electron microscope (SEM). The heat release lowering effect of the LCNF fabric against the water-based paint was observed with a cone calorimeter. Furthermore, the mechanical properties represented as the tensile strength of the NPCM-treated LCNF fabrics revealed that the increase of the NPCM content in the PP-composites led to an increased bending strength with enhancing the flame-retardance

Biochemical studies on chick embryo during incubation (Agricultural Chemistry)

孵卵中の卵白のシアル酸およびトリプシン阻害活性の変化を追求した。シアル酸濃度は日と共に徐々に増加し, インヒビター活性は, 最初減少したのち増加し, それ以後は変化しなかった。孵卵数日にして形成される漿尿膜(CAM)は, 強いシアリダーゼ活性を有し, 卵白のシアロタンパク質であるオボムチンやオボムコイドからシアル酸を遊離させた。またCAM自身もシアル酸を有し, 自らもシアル酸を遊離させる。微生物由来のシアリダーゼで処理したCAMは非常に強いシアリダーゼ活性を示したが, これは加えたシアリダーゼが膜と強く結合するものと考えられる。シアロタンパク質とCAMの結合が, オボムコイドの示すトリプシン阻害活性をもって間接的に, ^Iによる標識で直接的に検討された。用いたオボムコイド, オボムチン共に脱シアル酸処理をしたCAMとよく結合し, 逆に脱シアル酸処理したタンパク質は, そのままのCAMとよく結合した。The change of sialic acid content and trypsin inhibitory activity of chicken egg white during incubation were studied. The sialic acid concentration of egg white slightly increased during incubation, indicating the absorption of sialo-proteins of egg white into embryo occurred later than that of others. In early period of incubation, trypsin inhibitory activity rapidly and extensively decreased and after this period, trypsin inhibitory activity was kept at approximately constant level. Neuraminidase (sialidase) of chorioallantoic membrane (CAM) was able to release the endogenous sialic acid and showed the strong activity toward exogenously added ovomucoid and ovomucin. When neuraminidase was mixed with CAM in a buffer, sialic acid at the membrane surface was removed. Added neuraminidase remained bound at the surface of CAM despite of sufficient washing and shows strong activity on sialo-proteins. The experiments for CAM-sialo-protein binding showed that desialylated proteins (desialylated ovomucoid and ovomucin) bound to native CAM in greater amount than to desialylated CAM. Further, it was found that native sialo-proteins (native ovomucoid and ovomucin) bound to desialylated CAM rather than native CAM. ^I-labelled sialo-proteins were prepared and used in these binding experiments

64. Pressure-Induced Microphase Separation of Block Copolymers in the Aqueous Solution(poster presentation,Soft Matter as Structured Materials)

この論文は国立情報学研究所の電子図書館事業により電子化されました。従来、高分子水溶液系への圧力効果はホモポリマーの系を中心に研究が行われてきた。本研究では、これまでにほとんど研究例のないブロックコポリマー水溶液の系を用いることで、ミクロ相分離に伴い出現する構造形成を利用して、圧力による構造の変化を定量的に議論することを目指している。SANS(小角中性子散乱)による測定の結果、高温(45℃)、大気圧下でミクロ相分離を起こしbcc構造をとっている系に圧力を加えると、100MPa近傍でミクロ相分離構造が消失し、溶液中に分散することを確認した。ところが、さらに圧力を加えていくと、200MPa近傍で再び構造形成がなされていく、という温度変化においては見られない、再起的な構造の変化を得ることができた。一方、低温(28℃)で300MPaまで加圧を行うと、散乱関数がOrnstein-Zernike式に従いながら、相関長が連続的に増大していくことが観測された。ブロックコポリマーは、大気圧下での温度による相分離が1次転移的であることが知られているが、今回の実験の結果からは、低温での圧力変化が2次転移的な相分離を起こし、また、その相分離もミクロ相分離ではなくマクロな相分離を起こす可能性が示唆された

Laparoscopic Nephroureterectomy for Adult Patient with Primary Obstructive Megaureter

A 29-year-old female with a complaint of abdominal distension was referred to our hospital. She had a history of being treated for pyelonephritis three times. By computed tomography and retrograde pyelography, she was diagnosed with adult left primary megaureter. Her left renal function was severely deteriorated. She hoped for surgical intervention before becoming pregnant. Laparoscopic nephroureterectomy for megaureters seems to be difficult due to the large size. By sucking urine from an inserted ureteral catheter and setting trocar positions, we successfully performed laparoscopic nephroureterectomy for megaureter