scholarly journals Studies on Ecology and Control of Oxalis martiana ZUCC, a Perennial Weed on Upland Fields

1963 ◽  
Vol 1963 (2) ◽  
pp. 55-59
Author(s):  
Takayoshi KATAOKA ◽  
Masao ARAI ◽  
Michinori SHIOBARA
Keyword(s):  
Perennial Weed ◽  
And Control

scholarly journals Studies on the Ecology and Control of Perennial Weed, Scirpus in Paddy Field

1978 ◽  
Vol 23 (1) ◽  
pp. 19-23 ◽  
Author(s):  
Norimitsu ISHIKURA ◽  
Yoshio SOGA
Keyword(s):  
Paddy Field ◽  
Perennial Weed ◽  
And Control

Biology and control of Reseda lutea L. 1. Seed biology and seedling growth

1997 ◽  
Vol 48 (4) ◽  
pp. 511 ◽  
Author(s):  
J. W. Heap
Keyword(s):  
Seedling Growth ◽  
Control Strategies ◽  
Germination Rate ◽  
South Australia ◽  
Effective Control ◽  
Temperate Climate ◽  
Perennial Weed ◽  
Seed Biology ◽  
Early Seedling ◽  
And Control

Reseda lutea L. is a major perennial weed of alkaline cropping soils in South Australia. Seed biology and early seedling growth of R. lutea were studied in field and laboratory experiments to gain information needed for effective control strategies. Recovery of intact seeds buried for 4 years in the field at 50 and 150 mm was 77–96%. Germination of this seed was 33–63% (50 mm) and 0% (150 mm). Germination patterns differed markedly between seed collected from 2 populations. Seed germinated at all constant and fluctuating temperatures between 10 and 35° C with the maximum (88%) at 25°C constant. Mean temperature, rather than constancy or fluctuation, determined the germination rate. Light strongly inhibited germination. Seedling shoot growth was slow but tap root growth was rapid, reaching 350 mm within 28 days of emergence. Secondary roots arose 3–7 days after emergence and shoot buds formed on the roots within 28 days. R. lutea was found to be well adapted for persistence in cultivated fields with a temperate climate.

scholarly journals Study on Ecology and Control of Rumex obtusifolius, a Perennial Weed in Grassland

1971 ◽  
Vol 1971 (12) ◽  
pp. 40-45
Author(s):  
Hiroshi SAKAI ◽  
Tokuo SATO ◽  
Katsumi FUJIWARA ◽  
Yutaka SHIMADA
Keyword(s):  
Perennial Weed ◽  
Rumex Obtusifolius ◽  
And Control

scholarly journals Studies on the Ecology and Control of Perennial Weed, Scirpus in Paddy Field

1979 ◽  
Vol 24 (1) ◽  
pp. 28-32 ◽  
Author(s):  
Norimitsu ISHIKURA ◽  
Yoshio SOGA
Keyword(s):  
Paddy Field ◽  
Perennial Weed ◽  
And Control

THE BIOLOGY OF CANADIAN WEEDS.: 87. Cynoglossum officinale L.

1988 ◽  
Vol 68 (3) ◽  
pp. 763-774 ◽  
Author(s):  
MAHESH K. UPADHYAYA ◽  
HEIDY R. TILSNER ◽  
MICHAEL D. PITT
Keyword(s):  
North America ◽  
Environmental Stress ◽  
Seed Production ◽  
Seed Dormancy ◽  
Cynoglossum Officinale ◽  
Weed Biology ◽  
Perennial Weed ◽  
Animal Hair ◽  
And Control

Cynoglossum officinale L. is a biennial or short-lived perennial weed which reproduces by seed. It has been introduced to North America from Eurasia. Although usually not a weed of cultivated fields, C. officinale may become a serious rangeland weed. High seed production, seed dormancy, dissemination by attaching seeds to animal hair, wool and fur, plus the ability to withstand environmental stress are important in the success of C. officinale as a weed. Because C. officinale foliage is toxic to both cattle and horses, it is a particular problem in areas where grazing occurs. This paper reviews the biology and control of C. officinale.Key words: Weed biology, Cynoglossum officinale L., hound’s tongue

Control of Metal Alloy Oxidation with Electric Fields

1973 ◽  
Vol 31 ◽  
pp. 164-165
Author(s):  
R. R. Dils ◽  
P. S. Follansbee
Keyword(s):  
Electric Fields ◽  
Oxidation Process ◽  
Base Alloy ◽  
Oxide Surface ◽  
Platinum Electrodes ◽  
Insulating Layer ◽  
Iron Base Alloy ◽  
Alloy Oxidation ◽  
Aluminum Oxide Layer ◽  
And Control

Electric fields have been applied across oxides growing on a high temperature alloy and control of the oxidation of the material has been demonstrated. At present, three-fold increases in the oxidation rate have been measured in accelerating fields and the oxidation process has been completely stopped in a retarding field.The experiments have been conducted with an iron-base alloy, Pe 25Cr 5A1 0.1Y, although, in principle, any alloy capable of forming an adherent aluminum oxide layer during oxidation can be used. A specimen is polished and oxidized to produce a thin, uniform insulating layer on one surface. Three platinum electrodes are sputtered on the oxide surface and the specimen is reoxidized.

Evidence for a Blood Ganglion Barrier in the Superior Cervical Ganglion of the Rat

1982 ◽  
Vol 40 ◽  
pp. 204-204
Author(s):  
D. M. DePace
Keyword(s):  
Blood Vessels ◽  
Superior Cervical Ganglion ◽  
Peripheral Nerves ◽  
Time Schedule ◽  
Transmission Electron ◽  
Cervical Ganglion ◽  
The Central Nervous System ◽  
Cervical Ganglia ◽  
Capillary Circulation ◽  
And Control

The majority of blood vessels in the superior cervical ganglion possess a continuous endothelium with tight junctions. These same features have been associated with the blood brain barrier of the central nervous system and peripheral nerves. These vessels may perform a barrier function between the capillary circulation and the superior cervical ganglion. The permeability of the blood vessels in the superior cervical ganglion of the rat was tested by intravenous injection of horseradish peroxidase (HRP). Three experimental groups of four animals each were given intravenous HRP (Sigma Type II) in a dosage of.08 to.15 mg/gm body weight in.5 ml of.85% saline. The animals were sacrificed at five, ten or 15 minutes following administration of the tracer. Superior cervical ganglia were quickly removed and fixed by immersion in 2.5% glutaraldehyde in Sorenson's.1M phosphate buffer, pH 7.4. Three control animals received,5ml of saline without HRP. These were sacrificed on the same time schedule. Tissues from experimental and control animals were reacted for peroxidase activity and then processed for routine transmission electron microscopy.

Effects of renovascular hypertension on rat adrenal zona glomerulosa

1978 ◽  
Vol 36 (2) ◽  
pp. 582-583
Author(s):  
G. Mazzocchi ◽  
P. Rebuffat ◽  
C. Robba ◽  
P. Vassanelli ◽  
G. G. Nussdorfer
Keyword(s):  
Renovascular Hypertension ◽  
Left Kidney ◽  
Renin Angiotensin System ◽  
Plasma Renin ◽  
Zona Glomerulosa ◽  
Ultrastructural Changes ◽  
Albino Rats ◽  
Left Renal Artery ◽  
Angiotensin System ◽  
And Control

It is well known that the rat adrenal zona glomerulosa steroidogenic activity is controlled by the renin-angiotensin system. The ultrastructural changes in the rat zona glomerulosa cells induced by renovascular hypertension were described previously, but as far as we are aware no correlated biochemical and morphometric investigations were performed.Twenty adult male albino rats were divided into 2 experimental groups. One group was subjected to restriction of blood flow to the left kidney by the application of a silver clip about the left renal artery. The other group was sham-operated and served as a control. Renovascular hypertension developed in about 10 days: sistolic blood pressure averaged 165 ± 6. 4 mmHg, whereas it was about 110 ± 3. 8 mmHg in the control animals. The hypertensive and control rats were sacrificed 20 days after the operation. The blood was collected and plasma renin activity was determined by radioimmunological methods. The aldosterone concentration was radioimmunologically assayed both in the plasma and in the homogenate of the left capsular adrenal gland.

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