scholarly journals Experimental Amitosis in Onion Root Tip

1913 ◽  
Vol 32 (2) ◽  
pp. 103 ◽  
Author(s):  
H. E. Jordan
Keyword(s):  
Root Tip ◽  
Onion Root

scholarly journals Effects of Maytenus ilicifolia Mart. and Bauhinia candicans Benth infusions on onion root-tip and rat bone-marrow cells

2002 ◽  
Vol 25 (1) ◽  
pp. 85-89 ◽  
Author(s):  
Marjori Leiva Camparoto ◽  
Rosangela de Oliveira Teixeira ◽  
Mário Sérgio Mantovani ◽  
Veronica Elisa Pimenta Vicentini
Keyword(s):  
Bone Marrow ◽  
Bone Marrow Cells ◽  
Root Tip ◽  
Onion Root ◽  
Maytenus Ilicifolia ◽  
Rat Bone ◽  
Marrow Cells

Erratum: Making the Most of Onion Root Tip Mitosis

1982 ◽  
Vol 44 (2) ◽  
pp. 127-127
Author(s):  
Marshall D. Sundberg
Keyword(s):  
Root Tip ◽  
Onion Root

A CHARACTERIZATION OF NUCLEOSIDE DIPHOSPHATASE IN THE ONION ROOT TIP

1973 ◽  
Vol 21 (5) ◽  
pp. 417-425 ◽  
Author(s):  
W. D. KLOHS ◽  
C. W. GOFF
Keyword(s):  
Enzyme Activity ◽  
Lead Nitrate ◽  
Maximal Activity ◽  
Root Tip ◽  
Uridine Diphosphate ◽  
Onion Root ◽  
Guanosine Diphosphate ◽  
Inosine Diphosphatase ◽  
Triton X ◽  
Nucleoside Diphosphatase

Inosine diphosphatase of a Golgi-enriched fraction of the onion root tip was characterized. Peak enzyme activity occurred at pH 4.8 and 7.0, although considerable activity was present between the peaks. The activity at neutral pH approximately doubled during a 4-day cold storage; no such increase of the pH 4.8 activity occurred under similar conditions. Treatment with deoxycholate or Triton X-l00 also activated the pH 7.0 enzyme. Although magnesium, manganese and calcium all supported inosine diphosphatase activity, 2 mM manganese supported maximal activity. Uridine diphosphate, guanosine diphosphate and inosine diphosphate were hydrolyzed much more rapidly than the other substrates tested. Sodium fluoride, uranyl nitrate, potassium chloride and heat all partially inhibited the enzyme. Glutaraldehyde and lead nitrate, two reagents to which nucleoside diphosphatase is exposed when studied cytochemically, greatly reduced enzyme activity.

DIURNAL RHYTHMS IN MITOSIS OF CELLS OF THE ONION ROOT TIP MERISTEM

1971 ◽  
Vol 13 (3) ◽  
pp. 597-599 ◽  
Author(s):  
Richard C. Bishop ◽  
Richard M. Klein
Keyword(s):  
Mitotic Activity ◽  
Allium Cepa ◽  
Constant Temperature ◽  
Time Of Day ◽  
Diurnal Rhythms ◽  
Root Tip ◽  
Root Tips ◽  
Complete Darkness ◽  
Onion Root

Seeds of Allium cepa were grown in complete darkness at constant temperature. The root tips, collected from hours 72 to 96 after the start of imbibition, exhibited four maxima and four minima in mitotic activity. The timing of this rhythm was dependent upon the time of imbibition and not upon the time of day.

Interference by Near Ultraviolet and Green Light with Mitosis in the Onion Root Tip Meristem

1967 ◽  
Vol 94 (5) ◽  
pp. 411 ◽  
Author(s):  
Ellen G. Wolff ◽  
Dorothy Marie Fives ◽  
Richard M. Klein
Keyword(s):  
Green Light ◽  
Root Tip ◽  
Onion Root ◽  
Near Ultraviolet

INATE AND PHOTO-CONTROLLED MITOTIC RHYTHMS IN ONION ROOT-TIP CELLS

1973 ◽  
Vol 15 (4) ◽  
pp. 667-670 ◽  
Author(s):  
Richard C. Bishop ◽  
Richard M. Klein
Keyword(s):  
Mitotic Activity ◽  
Diurnal Rhythm ◽  
Low Temperatures ◽  
Root Tip ◽  
Fluorescent Light ◽  
Onion Root ◽  
Seed Imbibition ◽  
Tip Cells ◽  
Root Tip Cells ◽  
Red Radiation

A four-peaked diurnal rhythm in mitotic activity of dark-grown onion root-tip cells is initiated upon seed imbibition, damps rapidly and is lost within 5 days. It is abolished by continuous white fluorescent light, by continuous blue, green or red radiation, by low temperatures, high osmotica or anoxia. Photoperiodic light controls the well-known two-peaked persistent rhythm. The nature of the zeitgeber for either the inate or the photoperiodically-controlled rhythms is unknown.

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