An Automatic Respirometer for use with Small Invertebrates

first_img1. An automatic respirometer is described which has been developed to measure the rate of oxygen consumption by small arthropods in closed chambers. 2. The instrument removes 0.5 mul subsamples of air from the head space of specially designed sample chambers using a precision sampling valve and a motorized syringe. The prototype can monitor up to 10 sample chambers automatically over periods of several hours, using an electronic sequence switch to control the operation. 3. Oxygen concentration is measured using a coulometric fuel cell which produces an output signal directly proportional to the mass of oxygen passing over it and requires no calibration. The results are recorded on an integrator of the type commonly used with gas chromatographs. 4. The sensitivity of the respirometer is better than 1 mul h-1 when small chambers (1-2 ml) are monitored over 3-4 h. 5. The instrument is also capable of measuring the volume of the sample chambers to an accuracy of c. 2% allowing the volume of oxygen consumed by the sample to be calculated. 6. The instrument may be modified to measure the oxygen concentration in the head space of almost any container and would operate on a low-voltage DC supply for field operation.last_img read more

Track Roundup: 3/22

first_imgMillard’s girls showed well by placing third in the 4 x 800 relay (10:12.67). This team is comprised of Katy Kelly, Audrey Camp, Mary Degraffenreid and Hannah Koyle. The Wasps’ girls’ 1600-sprint medley team placed fourth in a time of 5:13.48. This team featured Sydney Samuelson, Maison Heap, Ariana Deschamps and Nabbie Willis. Bryton Matheson showed well in the 300-meter hurdles, placing third in a time of 44.49 seconds. Written by Lone Peak’s boys and girls each won the respective titles on their home track. Also winning an individual title for the Juab girls was Brooklynn Hunter in the high jump, posting a leap of 5 feet. HIGHLAND, Utah-Friday, Juab’s boys and girls track and field teams competed at the Mountain Valley Invitational hosted by Lone Peak High School, holding their own against 4-A, 5-A and 6-A schools. FacebookTwitterLinkedInEmailMountain View Invitational Brigham Perry finished eighth in the long jump, posting a leap of 19 feet. Richfield’s Melissa Crane (16-10.25 feet) placed second in the long jump. For the boys, Bodee Blackett placed eighth in the 100-meter dash in a time of 11.75 seconds. In the boys’ javelin, Zac Cowan placed second with a toss of 159-04 feet. Pine View Invitational In the girls’ 1600-meter run, Panguich’s Taylia Norris placed 12th overall in a time of 5:17.95. The meet concludes Saturday. For the boys, Orem is in first place with 33 points. Delta is tied with Cedar for eighth place with 8 points and Richfield is in 15th place with 5 points. Cambrie Hansen placed eighth in the girls discus with a toss of 80-02 feet and Valerie Clark finished third in the girls’ javelin posting a throw of 109 feet. The boys’ javelin saw Panguitch’s Jaxon Brienholt (145-07 feet) place eighth overall. March 22, 2019 /Sports News – Local Track Roundup: 3/22 Presently, in the girls’ standings, Desert Hills has the lead with 23 points. Richfield is tied for 7th with Cedar and Canyon View with 8 points. Delta is 10th with 7 points. Panguitch and Millard are tied for 11th with 6 points. Karlee Eyre of Panguitch placed third in the girls’ discus with a toss of 102-09.75 feet. Delta’s Paityn Callister (96-02.75 feet) and Brinley Henrie (94-02.75 feet) placed fifth and sixth respectively in the event. In the boys’ shot put, Valley’s Orrin Wood (42-10 feet) placed eighth and Braeden Stein of Kanab (41-09 feet) finished ninth. Tags: Aiton McFarland/Ariana Deschamps/Bodee Blackett/Brigham Perry/Brooklynn Hunter/Bryton Matheson/Cambrie Hansen/Dallan West/Dawson Olsen/Juab Track/Lone Peak High School/Maison Heap/Nabbie Willis/Ronnie Walker/Sydney Samuelson/Valerie Clark/Zac Cowan For the boys, Hayden Harward of Richfield placed fourth in the boys’ 1600-meter run (4:22.92). Dawson Olsen placed sixth in the boys’ high jump with a leap of 5 feet 10 inches. Brad James The boys’ high jump saw Delta’s Jaymen Brough (6 feet) place second. South Sevier’s Brad Taylor (5 feet-8 inches) also had a strong showing in the event. The boys’ 4 x 100 relay squad placed third in a time of 46.64 seconds as Dallan West, Aiton McFarland, Bodee Blackett and Brigham Perry represented the Wasps in this event. Juab’s girls were paced by Ronnie Walker, who won the 100-meter dash title in a time of 12.69 seconds. Walker also placed sixth in the girls’ 200-meter dash. Additionally, she placed second in the long jump with a leap of 16-10.25 feet. ST. GEORGE, Utah-Friday, numerous Mid-Utah Radio Sports Network schools and athletes competed during Day 1 of the Pine View Invitational at Pine View High School. Juab’s girls placed fourth with 68.5 points and the boys finished eighth with 29.33 points.last_img read more

VIDEO: Beresford Foreshore Coastal Protection Works Complete

first_img<span data-mce-type=”bookmark” style=”display: inline-block; width: 0px; overflow: hidden; line-height: 0;” class=”mce_SELRES_start”></span>Following the completion of coastal protection works to mitigate erosion, the Beresford Foreshore has reopened to the public, City of Greater Geraldton said in their latest announcement. Shane Van Styn, City of Greater Geraldton Mayor, said he was pleased the first stage of the Beresford Foreshore Coastal Protection and Enhancement Project was finished and looked forward to Stage 2 getting underway.“I am very happy the protection works are finally done and the Beresford Foreshore has reopened for use just in time for summer,” he said.“This is especially true for the shared footpath, which was really missed by the community during the ten month construction period.”Project protection works involved a 45m extension to the existing marina groyne; a 100m extension to the detached breakwater; and constructing three shore based rock revetments along the 1.8km long foreshore.The foreshore area between Midalia’s Beach and Mabel Street has also been planted with more than 18,000 native coastal seedlings to help stabilize the shoreline.[mappress mapid=”24659″]last_img read more