黑木耳并非越黑越好

不法商贩经常使用普通地耳染色冒充黑木耳。普通地耳是用锯末、秸秆撒上地耳菌人工繁殖的,有时在潮湿的地方自己也能生长,营养价值不高,而且成本很低,但经染色后就摇身一变成了“黑木耳”。造假者通常将地耳倒入盛满热水的铁锅里,放入一定量的墨汁,就可将原本黄褐色的地耳变成黑色的“黑木耳”。     

Fertility outcome of patients with testicular tumor： before and after treatment

Testicular cancer （TC） is the most curable type of cancer, with a survival rate of more than 95%. Oncologists are faced with the challenge that gonadotoxic cancer treatments can compromise future fertility, either temporarily or permanently. Our aim was to investigate the long-term effects of TC treatments on male fertility and on the offspring of patients who had received these treatments. Between January 1996 and December 2010, 125 eligible patients, ranging from 18 to 54 years （median age 36.3 _＋ 15.7）, with unilateral TC underwent surgery, chemotherapy or radiotherapy at our center. Some of these patients had their semen samples cryopreserved in the Shanghai Human Sperm Bank. The clinical data were evaluated, and questionnaire and telephone follow-up surveys were given to all patients. The data were analyzed to determine the patients＇ fertility status pre- and posttreatment. Of the 125 eligible patients, 93.6% （117/125） were accessible and were evaluated. Among 81 men who were married before diagnosis, 21 had conceived successfully before diagnosis and six reported azoospermia. Posttreatment conception was attempted by 73 men; of these, 16 conceived naturally and 19 conceived by artificial reproductive techniques, resulting in 37 healthy babies with no congenital malformations. Of the patients who had not conceived before treatment, 21.9% （21/96） banked their sperm and 23.8% of these patients （5/21） subsequently used the banked sperm. Retroperitoneal lymph node dissection, chemotherapy and radiotherapy were the most highly correlated with lack of conception to TC patients with the desire for biological conception. There is no birth defects or childhood malignancies. post-TC treatment. Sperm banking should be recommended evidence to suggest that TC treatments are associated with     

金钱白花蛇的人工繁殖与采收加工

金钱白花蛇为爬行纲眼镜蛇科银环蛇属(Bungarus multicinctus Blyth)银环蛇去除内脏的干燥幼体。由于药用时加工成圆盘,状如钱币而得名。头部椭圆形,颈部不明显,有前沟牙,白头部开始至尾部的背侧面有黑白相间的环带,其中躯干部有环带30～50个,尾部有9～15个,环带宽约为1～2枚背     

长柱金丝桃生长发育及人工繁殖技术研究

目的:了解长柱金丝桃形态变化、生长状况及人工繁殖技术。方法:利用现场观察记录形态的变化,测量长柱金丝桃的株高和直径,利用SPSS软件建立生长的数学模型;在人工栽培地进行有性和无性繁殖。结果:长柱金丝桃于每年4月末萌发,5月末出现分枝、6月末开花,8月初为盛果期,10月初种子成熟。株高、叶和分枝变化的Verhaulst模型分别为:H=127.109/1+23.7441×e-0.062t、L=23.343/+11.303×e-0.062t、B=22.037/1+73.068×e-0.068t。无性繁殖中整株移植成活率为100%,分株成活率为67.2%;有性繁殖中种子发芽率为15.2%,移苗成活率在36%。结论:长柱金丝桃生长发育期为4~10月,可以进行人工繁殖。     

公卫：蚊虫的生物防治技术（下）

为达到良好的生物防治目的，通常采用人工繁殖天敌（包括病原微生物），或从国外引入或移植新的天敌，改变群落结构。下面继续介绍可成为蚊虫天敌的其它生物，如真菌、寄生物和捕食。     

细叶香茶菜人工繁殖

细叶香茶菜可用种子繁殖和插条繁殖,二者在生产上均可使用。     

裸项栉鰕虎鱼的全人工繁殖及其胚胎发育

目的 研究裸项栉鰕虎鱼全人工繁殖及胚胎发育,为该鱼的实验动物化研究奠定基础. 方法 对胚胎和仔稚幼鱼各个发育期的连续取样,系统地观察了裸项栉鰕虎鱼各发育期的形态变化及生长特征.结果 水温25.8℃～26.5 ℃,裸项栉鰕虎鱼受精后约82h仔鱼开始出膜,初孵仔鱼全长1.42～1.73 mm,1d开口摄食,3d卵黄囊消失,23d第一背鳍形成,鳞片出现;33d全身被鳞;初孵仔鱼经97d发育成熟,繁殖周期约为36 d;雌鱼性腺成熟系数可达40%,个体相对生殖力达每克8193.5粒.结论 裸项栉鰕虎鱼具有个体小、性成熟早、生殖季节长、繁殖周期短、繁殖力强等特点,可进行室内规模化人工繁殖和培育.