Applications of gibberellic acid to the mature form of Hedera helix induce morphological reversions to the juvenile form of growth. The juvenile forms produced are stable with time and differ dramatically from the mature in phenotype. DNA-RNA hybridization techniques have been used to study the RNA populations of juvenile, mature and gibberellic acid-treated mature apices. Hybridization competi...

Nghiên cứu nhằm đánh giá ảnh hưởng của thời vụ trồng, khoảng cách, độ che sáng và lượng đạm bón đến khả năng sinh trưởng, phát triển suất cây Thường xuân nhập nội (Hedera helix L.) được trồng tại Sa Pa, Lào Cai từ đó làm cơ sở để xây dựng quy trình theo tiêu chí GACP – WHO. Thí nghiệm bố trí kiểu khối ngẫu nhiên đầy đủ (RCBD), 3 lần nhắc lại, với (15/10, 15/11 15/12), cách (20*30, 25*30, 30*30c...

A bstiract. The role of light in cold acclimation of Hedera helix L. var. Thorndale appears to differ from that reported for winter annuals. Although light greatly enhances the degree of hardiness attained, cold acclimation is not obligatorily linked to a light requirement. Photoperiods, varying from 8 to 24 hours, received during the cold acclimation period were equally effective in promoting ...

Abstract Background Hedera helix L. is an invasive weed species introduced in several regions of the world, so it relevant to study its effects on plant community and changes occurring after eradication. We established invaded (with/without removal H. ) non-invaded understory) plots compare some attributes oak forest Mexico City monitored them every 2 months for 1 year, taking soil samples edap...

As wind energy becomes a larger portion of the world’s energy portfolio there has been an increased interest for wind turbines to control their active power output to provide ancillary services which support grid reliability. One of these ancillary services is the provision of frequency regulation, also re­ ferred to as secondary frequency control or automatic generation control (AGC), which is...