Studies on the initiation of growth and moulting in Locusta migratoria migratorioides R. & F.—IV. The relationship between the stomatogastric nervous system and neurosecretion

1963 ◽  
Vol 9 (4) ◽  
pp. 423-430 ◽  
Author(s):  
Kenneth U. Clarke ◽  
Peter A. Langley
Keyword(s):  
Nervous System ◽  
Locusta Migratoria ◽  
Stomatogastric Nervous System ◽  
Locusta Migratoria Migratorioides ◽  
The Relationship

On the Initiation of Spermatophore Formation in the African Migratory Locust, Locusta Migratoria Migratorioides Reiche and Fairmaire

1965 ◽  
Vol 42 (3) ◽  
pp. 423-435
Author(s):  
G. E. GREGORY
Keyword(s):  
Nervous System ◽  
Sexual Behaviour ◽  
Locusta Migratoria ◽  
Abdominal Ganglion ◽  
Migratory Locust ◽  
Locusta Migratoria Migratorioides ◽  
Early Stages ◽  
The Brain

1. The behaviour of the male culminating in spermatophore formation is divisible into four phases: approach; mounting; copulation; and spermatophore formation. All appear to be controlled and co-ordinated solely through the nervous system. 2. The initiation of sexual behaviour requires the brain and one or more of the receptor-bearing head structures (antennae, palpi and eyes) to be functional. 3. Approach and mounting behaviour involves the receptors, nervous system and effectors of the head and thorax only. 4. Copulation is controlled through the ganglia of the abdomen but for its initiation these ganglia have to be in nervous communication with a centre anterior to them. Also both cerci must be functional. 5. Spermatophore formation is initiated, and its early stages are controlled, by an anterior centre which has its effect through the last abdominal ganglion. The later stages of formation appear to be controlled by the last abdominal ganglion alone. 6. The presence of the female is essential for the initiation and early stages of spermatophore formation, but her role during the later stages of the process appears to be a completely passive one.

The Control of Water Loss in Locusta Migratoria Migratorioides R. & F

1968 ◽  
Vol 49 (1) ◽  
pp. 1-13
Author(s):  
J. P. LOVERIDGE
Keyword(s):  
Water Loss ◽  
Locusta Migratoria ◽  
Initial Period ◽  
Lipid Monolayer ◽  
Permeability Change ◽  
Saturation Deficit ◽  
Locusta Migratoria Migratorioides ◽  
Apparent Decrease ◽  
The Relationship ◽  
Anomalous Relationship

1. The rate of water loss from the cuticle of Locusta is proportional to weight. 2. The rate of water loss from the cuticle at 30° C., 0% R.H. is 5.63±0.67 mg./ locust/hr., giving a permeability of 0.022 mg./cm.2/mm. Hg/hr. 3. The transition temperature at 46-48° C. is similar to that of Schistocerca (Beament, 1959) and probably indicates the existence of an oriented lipid monolayer in the epicuticle. 4. At relative humidities of 0-50 % the rate of water loss from whole locusts decreases with time. This phenomenon, which does not occur at 75%R.H., is partly due to the loss of adsorbed hydroscopic water during the initial period. A continuing apparent decrease in transpiration is shown to be a true permeability change. 5. The relationship between saturation deficit and rate of water loss at 30° C. is curvilinear, falling away at high saturation deficits. This results in a saving of water amounting to 1.5-2.5 mg./locust/hr. at 25 % R.H. and 2.7-4.0 mg./locust/hr. at 0% R.H. and will be biologically significant if not an artifact. 6. The anomalous relationship between saturation deficit and rate of water loss is caused by the permeability change occurring at low R.H. Three theories which may account for these phenomena are discussed.

Postsynaptic neuronal geometry and synaptic effectiveness

1987 ◽  
Vol 45 ◽  
pp. 690-697
Author(s):  
C.J. Wilson
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Synaptic Function ◽  
Postsynaptic Neuron ◽  
Synaptic Inputs ◽  
Partial Analysis ◽  
Postsynaptic Cell ◽  
Neuronal Geometry ◽  
The Relationship ◽  
Complex Scale

Most central nervous system neurons receive synaptic input from hundreds or thousands of other neurons, and the computational function of such neurons results from the interactions of inputs on a large and complex scale. In most situations that have yielded to a partial analysis, the synaptic inputs to a neuron are not alike in function, but rather belong to distinct categories that differ qualitatively in the nature of their effect on the postsynaptic cell, and quantitatively in the strength of their influence. Many factors have been demonstrated to contribute to synaptic function, but one of the simplest and best known of these is the geometry of the postsynaptic neuron. The fundamental nature of the relationship between neuronal shape and synaptic effectiveness was established on theoretical grounds prior to its experimental verification.

Risk assessment of occupational and occupationally conditioned diseases connection to noise when exceeding maximum permissible levels

2019 ◽  
pp. 17-19
Author(s):  
Vladimir A. Fokin ◽  
Dmitrii M. Shlyapnikov ◽  
Svetlana V. Red’ko
Keyword(s):  
Blood Pressure ◽  
Nervous System ◽  
Autonomic Nervous System ◽  
High Blood Pressure ◽  
Noise Exposure ◽  
Physical Factors ◽  
Autonomic Nervous ◽  
Permissible Levels ◽  
The Relationship ◽  
Perm Region

In accordance with the requirements of paragraph 3.2.6 of sanitary rules and norms «Sanitary and epidemiological requirements for physical factors at workplace», in the event of exceeding noise level at workplace above 80 dBA, an employer is obliged to assess the health risk of workers and confirm an acceptable risk to their health. The connection between the incidence of occupational and occupationally conditioned diseases with noise exposure exceeding the maximum permissible levels (80 dBA) was estimated. The assessment was carried out at a food industry enterprise of Perm Region. Assessing the relationship between morbidity and noise exposure is the first step in evaluation of occupational health risks for workers exposed to noise exceeding MAL. If a reliable relationship between morbidity and noise exposure is established, an assessment of occupational risk is conducted. The odds ratio (OR) for diseases characterized by high blood pressure and disorders of autonomic nervous system was <1 (confidence interval CI=0.11–1.61 and CI=0.08–2.78, respectively). The relative risk (RR) for diseases characterized by high blood pressure and disorders of autonomic nervous system was <1. The received data testify absence of connection of morbidity with exposure to industrial noise, calculation of etiological share of responses and levels of risk is not required.

Sign in / Sign up

Export Citation Format

Share Document