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Fall in uterine histamine associated with ovum implantation in pregnant rat
Volume Number
79 2
Selected
The effect of leucine-vasopressin, which can be regarded as a structural intermediate between natural vasopressin and oxytocin, on hydrated rats and dogs was studied in regard to the excretion or retention of sodium and potassium. The studies show the drug to have a physiologital effect between vasopressin and oxytocin with the action of both being present. The injection of leucine-vasopressin intravenously in submaximal antidiuretic doses to hydrated dogs and rats produces an increase in the rate of urinary excretion proportionate
of both sodium to the dosage.
and potassium, Because of the
parallel rise in K+ excretion, the authors that the mechanism, although obscure, one of interference with renal actions with aldosterone or other adrenocortical
Stuart
suggest is not such as steroids.
0. Silverberg
Schachter,
The uteri of recently mated rats were examined for histamine content at intervals of 96, 120, and 144 hours after detection of sperm in the vagina. Both histamine content and concentration were measured and found reduced between 96 hours and
to be markedly 120 to 144 hours.
Since ovum implantation occurs in rats of this colony around 120 to 135 hours after mating and since sperm were detected about 8 hours following mating, reduction in histamine concentration and content of gravid uteri took place just prior to implantation. The author feels that these findings add evidence for a role of histamine in the mechanism of nidation related to induction of decidual cell reaction.
Stuart C. Silverberg Vol. 101, June, Kulangara,
1959.
A. C., and Sellers, Bacteriophages From in the Rat, p. 207.
M. I.: Mother
Passage of to Foetus
July, 1959. Maneesh,
Public
M. S., and Johnson, of Dietary Vitamin the Rat, p. 467. Health
Reports
Vol. 73, November, “Schachter,
1958..
J., Waggoner, D. P. K.: Short Range
p. 989.
B. C.: Production K Deficiency
E., and Whelpton, Birth Projections,
in
4OP
Waggoner, and Whelpton: Range Birth Projections, p. 989.
The authors present a refined mating numbers of future births,
method based
and parity, for the period 1956-1965. Two projections are made: “A,”
Short
of estiupon age on
the
as-
sumption that fertility trends would level off by 1960 and remain at that level until 1965, and, “B,” that the fertility trends would be the same as in 1955 during the period 1956-1965. Thus, the authors present two projection estimatesSeries A projects 4.45 million births in 1960 and 4.99 million in 1965, while the Series B projection estimates 4.26 million births and 4.76 million births, respectively, for 1960 and 1965.
Schuyler G. Kohl Vol. 74, April, “Pasamanick,
Shelesnyak: Fall in Uterine Histamine Associated With Ovum Implantation in Pregnant Rat, p. 380.
abstracts
1959.
B., Dinitz, Geographic and Births, p. 285.
S., and Seasonal
Knobloch, Variations
H.: in
Pasamanick, Dinitz, and Knobloch: Geographic and Seasonal Variations in Births, p. 285. The authors lected groups
have tabulated of states by
the
births in four scmonth of births.
These areas compared were: (a) Alabama, Louisiana, and Mississippi; (b) Minnesota and Wisconsin; (c) Maine, New Hampshire, and Vermont; (d) Washington and Oregon. The authors were testing the hypothesis that the annual spring decline in births might be attributed to the discomforts of high summer temperatures and high humidity. The findings were: (1) the southern states showed a marked decline in birth during the spring months and a corresponding peak in the number of late summer births; (2) the midwestern and northeastern states showed a lesser trough in spring births; (3) the northwestern states exhibited no spring trough at all; (4) male births are fewer just prior to and during the descending curve of the spring depression. The following postulations are presented to explain the above findings: ( 1) uncomfortable temperatures reduce the frequency of coition; (2) there is an increased fetal death rate among conceptions occurring immediately prior to and during the summer months; (3) statistically, increased births during the summer automatically decrease the possibility of conception at this time and subsequent spring delivery. The authors note that their unpublished data for Baltimore, Maryland, reveal that the trough
79 2
Selected
The effect of leucine-vasopressin, which can be regarded as a structural intermediate between natural vasopressin and oxytocin, on hydrated rats and dogs was studied in regard to the excretion or retention of sodium and potassium. The studies show the drug to have a physiologital effect between vasopressin and oxytocin with the action of both being present. The injection of leucine-vasopressin intravenously in submaximal antidiuretic doses to hydrated dogs and rats produces an increase in the rate of urinary excretion proportionate
of both sodium to the dosage.
and potassium, Because of the
parallel rise in K+ excretion, the authors that the mechanism, although obscure, one of interference with renal actions with aldosterone or other adrenocortical
Stuart
suggest is not such as steroids.
0. Silverberg
Schachter,
The uteri of recently mated rats were examined for histamine content at intervals of 96, 120, and 144 hours after detection of sperm in the vagina. Both histamine content and concentration were measured and found reduced between 96 hours and
to be markedly 120 to 144 hours.
Since ovum implantation occurs in rats of this colony around 120 to 135 hours after mating and since sperm were detected about 8 hours following mating, reduction in histamine concentration and content of gravid uteri took place just prior to implantation. The author feels that these findings add evidence for a role of histamine in the mechanism of nidation related to induction of decidual cell reaction.
Stuart C. Silverberg Vol. 101, June, Kulangara,
1959.
A. C., and Sellers, Bacteriophages From in the Rat, p. 207.
M. I.: Mother
Passage of to Foetus
July, 1959. Maneesh,
Public
M. S., and Johnson, of Dietary Vitamin the Rat, p. 467. Health
Reports
Vol. 73, November, “Schachter,
1958..
J., Waggoner, D. P. K.: Short Range
p. 989.
B. C.: Production K Deficiency
E., and Whelpton, Birth Projections,
in
4OP
Waggoner, and Whelpton: Range Birth Projections, p. 989.
The authors present a refined mating numbers of future births,
method based
and parity, for the period 1956-1965. Two projections are made: “A,”
Short
of estiupon age on
the
as-
sumption that fertility trends would level off by 1960 and remain at that level until 1965, and, “B,” that the fertility trends would be the same as in 1955 during the period 1956-1965. Thus, the authors present two projection estimatesSeries A projects 4.45 million births in 1960 and 4.99 million in 1965, while the Series B projection estimates 4.26 million births and 4.76 million births, respectively, for 1960 and 1965.
Schuyler G. Kohl Vol. 74, April, “Pasamanick,
Shelesnyak: Fall in Uterine Histamine Associated With Ovum Implantation in Pregnant Rat, p. 380.
abstracts
1959.
B., Dinitz, Geographic and Births, p. 285.
S., and Seasonal
Knobloch, Variations
H.: in
Pasamanick, Dinitz, and Knobloch: Geographic and Seasonal Variations in Births, p. 285. The authors lected groups
have tabulated of states by
the
births in four scmonth of births.
These areas compared were: (a) Alabama, Louisiana, and Mississippi; (b) Minnesota and Wisconsin; (c) Maine, New Hampshire, and Vermont; (d) Washington and Oregon. The authors were testing the hypothesis that the annual spring decline in births might be attributed to the discomforts of high summer temperatures and high humidity. The findings were: (1) the southern states showed a marked decline in birth during the spring months and a corresponding peak in the number of late summer births; (2) the midwestern and northeastern states showed a lesser trough in spring births; (3) the northwestern states exhibited no spring trough at all; (4) male births are fewer just prior to and during the descending curve of the spring depression. The following postulations are presented to explain the above findings: ( 1) uncomfortable temperatures reduce the frequency of coition; (2) there is an increased fetal death rate among conceptions occurring immediately prior to and during the summer months; (3) statistically, increased births during the summer automatically decrease the possibility of conception at this time and subsequent spring delivery. The authors note that their unpublished data for Baltimore, Maryland, reveal that the trough