孵化等外种蛋是否合算

每年都有千百万个种蛋因被认为不适于孵化而被抛弃。关于是否的判断是根据公司所定的标准作出的。巴拿马的研究表明，可以减少等外种蛋的数量，因为许多以前认为不适于孵化的种蛋可以成功地得到孵化。     

用木质废料制造木质片材

以锯屑、树皮等细小的废料为原料,用水系而容易凝胶化的可形成橡胶状弹性体的聚氨酯作为阻水剂,可制造出一种新型材料。按成型条件的不同,和有无二次热压,可制出从比较柔软到相当硬的片材产品,因而有很宽的使用范围,如用作包装材料、地板材料、各种绝缘材料、植物栽培筒罐、干燥农业用地的隔水板等等。原料柔软片材要使用20～80目的锯屑,用19号带锯条的锯屑大体可以符合其粒级要求,有少量通过80目的微粉也不会给成型带来困难。使用排锯机、元锯机的锯屑,需要筛去大于10目的锯屑;必要时可粉碎后加以利用。树皮要去掉硬质表皮的咖啡渣,单独     

Trypanocidal activity of extracts and fractions of Bertholletia excelsa

Crude extracts and fractions of Bertholletia excelsa stem barks were tested for trypanocidal activity. Acetone and methanol extracts showed significant in vitro trypanocidal activity against trypomastigote form of Trypanosoma cruzi since in the concentration of 500 microg/ml, the parasites were reduced in 100% and 90.3% respectively, whereas the triterpene betulinic acid pure isolated from hexane extract presented 75.4%.     

Morphinandienone alkaloids from Dehaasia longipedicellata

Five morphinoid alkaloids have been isolated from Dehaasia longipedicellata, namely (-) pallidine, a new alkaloid (+) pallidinine (1), (+)-milonine, (-) 8,14-dehydrosalutaridine and (-) sinoacutine.