Testing of new materials

Project report form no. 8 dated February 9, 1943 / N. A. Kjelson -- Project report no. 1 dated Feb. 12, 1943. By-products derived from the guar and Honey locust embryos / D. Fronmuller -- Project report form dated June 22, 1943. Report on the composition of the endosperm mucilages / Ernest Anderson -- Project report form no. 9 dated July 19, 1943 / N. A. Kjelson -- Project report form no. 10 dated August 6, 1943 / N. A. Kjelson -- Project report form no. 2 dated August 17, 1943. Composition of he endosperm mucilages of legumes / Ernest Anderson -- Project report form no. 11 dated Sept. 13, 1943 / N. A. Kjelson -- Project report form no. 2 dated Sept. 20, 1943. Improvement of formation and tear values through beater addition of hydrolyzed locust bean gums / John W. Swanson -- Project report form no. 12 dated 10/2/43. Viscosity and paper tests on samples of guar gum of the types expected to be made form commercial usage / N. A. Kjelson -- Project report form no. 3 dated October 15, 1943. Some experiments with a possible fractionation of locust bean gum and evaluation of the products / John W. Swanson -- Project report form no. 5 dated Dec. 13, 1943. Further experimental conversions of locust bean gum / John W. Swanson -- Project report form no. 13 dated November 24, 1943 / N. A. Kjelson -- Project report form no. 5 dated Dec. 13, 1943 (repeated)Title from folder label

Testing of new materials

Project report form dated Sept. 1, 1941 to June 1, 1942. Search for substitutes for carob mucilage / Ernest Anderson -- Project report form no. 1 dated December 2, 1941. Various plant gums and mucilages as fiber deflocculants for paper pulp and a study of their effects on the wet and dry strength of papers containing them as internal sizes / N. A. Kjelson -- Project report form no. 1 dated Sept.17, 1942. Investigation on guar oil / Myron Ehrlich -- Project report form no. 1 dated July 31, 1943. Some experiments on the conversion of manno-galactan gums / John W. Swanson -- Project report form no. 2 dated October 29, 1942. Further studies on guar oil and preliminary investigations of Honey locust oil / Myron Ehrlich -- Project report form no. 1 dated February 19, 1942. Plant mucilages / B. W. Rowland -- Project report form no. 2 dated February 23, 1942. Natural plant gums and mucilages in paper (continued) / N. A. Kjelson -- Natural plant gums and mucilages in paper (continued from report nos. 1 and 2) / N. A. Kjelson -- Project report form no. 4 dated June 23, 1942. Natural plant gums and mucilages in paper (continued) / Niles A. Njelson -- Project report form no. 5 dated August 26, 1942. Natural plant gums and mucilages in paper (continued) / N. A. Kjelson -- Project report form no. 6 dated Sept. 30, 1942. Natural plant gums and mucilages in paper / Niles Kjelson -- Project report form no. 7 dated Nov. 19, 1942 / N. A. Kjelson.Title from folder label

A test of the cumulative effect of river weirs on downstream migration success, speed and mortality of Atlantic salmon (Salmo salar) smolts: An empirical study

This study investigated the cumulative impact of weirs on the downstream migration of wild Atlantic salmon (Salmo salar) smolts in the River Foyle, Northern Ireland. In spring of 2013 fish were released in two tributaries of similar length; one tributary (impacted) had seven low‐head weirs along the migration pathway and the other was devoid of such structures (un‐impacted). Salmon smolts fitted with acoustic transmitters were monitored via a passive acoustic telemetry array during downstream migration. In 2014 the study was repeated only in the impacted tributary. Overall freshwater survival rates were high (>94%). There was no significant difference in mortality, movement pattern, delay or travel speeds between rivers or between years at any phase of migration. Escapement of salmon smolts through Lough Foyle (a marine sea lough) to the open ocean was low, approximately 18% in each year. Escapement did not differ between impacted and un‐impacted rivers. This study showed no postpassage effects of weirs on mortality, migration speed or escapement of downstream migrating smolts. This suggests that the elevated mortality at low‐head obstacles described in other studies is not inevitable in all river systems. Migration through rivers with natural riffle‐pool migration may result in similar effects as those from low‐head weirs. Causes of apparent high mortality in the early part of marine migration in this study, are unknown; however similar studies have highlighted the impact of fish predators on smolts