Breast cancer: induction of differentiation by embryonic tissue

A mouse mammary tumor, adenocarcinoma BW 10232, was maintained in vitro for 14 days, separated from embryonic mammary mesenchyme by a Millipore filter. Tubules developed in the tumor; deoxyibonucleic acid synthisis declined; and a presumptive acid mucopolysaccharide matrix, not evident in the controls, appeared.     

微生物与种子处理

概述了具有生防功能的微生物的主要种类,生物防治的作用及其在种子处理上的应用现状,并对微生物与种子处理之间存在的问题以及发展前景提出展望.     

Breast and ovarian cancer risks due to inherited mutations in BRCA1 and BRCA2

Risks of breast and ovarian cancer were determined for Ashkenazi Jewish women with inherited mutations in the tumor suppressor genes BRCA1 and BRCA2. We selected 1008 index cases, regardless of family history of cancer, and carried out molecular analysis across entire families. The lifetime risk of breast cancer among female mutation carriers was 82%, similar to risks in families with many cases. Risks appear to be increasing with time: Breast cancer risk by age 50 among mutation carriers born before 1940 was 24%, but among those born after 1940 it was 67%. Lifetime risks of ovarian cancer were 54% for BRCA1 and 23% for BRCA2 mutation carriers. Physical exercise and lack of obesity in adolescence were associated with significantly delayed breast cancer onset.     

生物农药与种子处理

阐述了生物农药的类型、作用及发展状况,介绍了生物农药在种子处理中的应用情况和存在的问题,并对生物农药的发展及在种子处理中的应用作了展望。     

伴有对侧乳房严重骨化的犬乳腺癌的病理学观察

动物医院接到一个犬乳腺肿物的病例,为了判断其性质,采用课题组发明专利进行病理组织切片制作和H.E染色技术进行染色。经病理学研究诊断为一侧是犬乳腺癌,组织学上为实性癌和乳头状癌,对侧乳房组织发生严重骨化。其发生机理可能是乳腺长时间慢性炎症或激素不平衡或肿瘤组织不断生长,导致母犬乳腺组织长期处于高分泌状态,致使乳腺组织骨化。其明确诊断为犬乳腺肿瘤疾病的诊断和治疗提供参考。     

芒果炭疽病的发生规律及综合防治

芒果炭疽病是影响世界芒果生产的重要病害。阐述了芒果炭疽病的发病症状、芒果病原菌生物学特性、病害发生规律及发病原因等,系统地总结了芒果炭疽病的综合防治措施,包括选用抗病品种、农业防治、化学防治、生物防治等。     

热处理工艺对竹材性能的影响

采用热处理温度为160,180,200℃,热处理时间为2,4,6 h的高温热处理工艺对毛竹Phyllostachys edulis竹材进行改性处理,分析不同热处理工艺对竹材化学成分和力学性能的影响,将分别在160,180,200℃下处理4h后的竹材进行傅立叶变换红外光谱图表征。结果表明:热处理温度越高和时间越长,竹材中木质素质量分数也越高,综纤维素、α-纤维素质量分数呈现下降的趋势,竹材的纵向抗弯强度呈减小趋势,并且抗弯弹性模量呈减小趋势。200℃,6 h热处理竹材与未处理竹材相比,木质素质量分数上升了115.0 g·kg-1,综纤维素质量分数下降了93.1 g·kg-1,α-纤维素的质量分数下降了239.4 g·kg-1,毛竹竹材的抗弯强度较未处理材减小了84.5 MPa,抗弯弹性模量较未处理材减小了1.86 GPa。红外谱图中竹材表面羟基数目随热处理温度的上升和热处理时间的延长不断减少。     

不同处理对芍药生长发育的影响

以早花、中花、晚花3个芍药品种为材料,以草炭∶蛭石∶珍珠岩=3∶1∶1为基质,研究了基质盆栽(处理1)与大田地栽(处理2,CK)对芍药生长、开花的影响.结果表明,芍药在草炭∶蛭石∶珍珠岩=3∶1∶1的基质能够正常生长开花,处理1不仅可以达到处理2(CK)的效果,而且提早开花近2个月,延长花期4-6d.处理1成功实现了芍...