Blog

Cardiac muscle cells are connected by special junctions called intercalated discs. Intercalated discs provide strength between cells of tissues which exhibit high mechanical stress, strong flexible connections between tissue cells, and electrical excitability between the cells. Using this information, which junctions are present in intercalated discs?

Bonus Questions!  Note: the maximum score you can receive is 100 points.  Recently researchers mapped the ‘connectome’ of what organism and specifically what is the ‘connectome’? (2 points) How did scientists traditionally determine the structure of proteins? Recently, the Nobel prize was awarded to Alphafold 2.0. Why? (2 points)  

Use APA Technical Note Q225 entitled Load-Span Tables for APA Structural-Use Panels and ASD procedures to answer the following question.The spacing of joists in a flat roof is 19.2-in. o.c. Roof dead load = 9 psf. Snow load = 59 psf. Roof sheathing is to be an APA rated plywood sheathing, and panels are to be oriented in the strong direction. The load is governed by deflection limits of L/240 for snow load and L/180 for total load. Only consider these limits. Assume multi-span, normal duration of load, dry conditions, and panels 24 inches or wider. Would a panel with a span rating of 32/16 be adequate?

A wood member is loaded as shown. Using ASD, determine the adjusted bending strength, Fb’. Assume normal temperatures, no incising, and that all loads act in the directions shown. Ignore the weight of the member.Load:PD = 3,000 lbPL = 0 lbPLr = 0 lbPS = 0 lbPR = 0 lbPW = 6,000 lbPE = 8,000 lbQD = 2,500 lbQL = 3,500 lbQLr = 5,000 lbQS = 1,000 lbQR = 500 lbQW = 0 lbQE = 0 lbSpan:L = 10 ft Member size:4 x 6 Stress grade and species:No. 1 & Better Douglas Fir-Larch Unbraced length:lu = 0 ft Moisture content:MC > 19 percent 

Use APA Technical Note Q225 entitled Load-Span Tables for APA Structural-Use Panels and ASD procedures to answer the following question.The spacing of joists in a floor system is 30-in. o.c. Floor dead load = 13 psf. Floor live load = 140 psf. Floor sheathing is to be an APA rated OSB sheathing, and panels are to be oriented in the strong direction. The load is governed by bending and shear for total load. Only consider these limits. Assume multi-span, normal duration of load, dry conditions, and panels 24 inches or wider. Would a panel with a span rating of 40/20 be adequate?

Use APA Technical Note Q225 entitled Load-Span Tables for APA Structural-Use Panels and ASD procedures to answer the following question.The spacing of joists in a floor system is 30-in. o.c. Floor dead load = 10 psf. Floor live load = 107 psf. Floor sheathing is to be an APA rated OSB Sturd-I-Floor sheathing, and panels are to be oriented in the strong direction. The load is governed by a deflection limit of L/240, bending, and shear for total load. Only consider these limits. Assume multi-span, normal duration of load, dry conditions, and panels 24 inches or wider. Would a panel with a span rating of 24 oc be adequate?

A wood column is pin connected at its top and bottom. Determine the controlling slenderness ratio, le/d, for the column. Assume normal temperatures, no incising, and that all loads are downward. Ignore the weight of the member.Load:PD = 500 lbPL = 3,500 lbPLr = 1,000 lbPS = 1,500 lbPR = 1,500 lbPW = 0 lbPE = 0 lbLength:L = 9 ftMember size:4 x 12Stress grade and species:No. 2 Douglas Fir-LarchUnbraced length:lu = L = 9 ftMoisture content:MC < 19 percent

The nurse is caring for a client with Chronic Obstructive Pulmonary Disease (COPD), and the client’s FEV1 is 35%. Based on the Global Initiative for Chronic Obstructive Lung Disease (GOLD) classifications, how would the severity of the client’s COPD be categorized?

A wood member is loaded as shown. Using ASD, determine the adjusted tension strength, Ft’. Assume normal temperatures, no incising, and that all loads act in the directions shown. Ignore the weight of the member.Load:PD = 4,500 lbPL = 0 lbPLr = 0 lbPS = 0 lbPR = 0 lbPW = 5,500 lbPE = 6,000 lbQD = 4,000 lbQL = 3,000 lbQLr = 3,000 lbQS = 2,000 lbQR = 2,000 lbQW = 0 lbQE = 0 lbSpan:L = 14 ft Member size:4 x 12 Stress grade and species:No. 1 & Better Douglas Fir-Larch Unbraced length:lu = L/2 = 7 ft Moisture content:MC < 19 percent 

A pin-connected wood truss is loaded and supported as shown. Determine the axial force produced in member GH if PB = 1,000 lb, PC = 2,200 lb, PD = 3,200 lb, L = 6 ft, and h = 8 ft. Positive choices indicate tension. Negative choices indicate compression.