91av

ACROSS

1 See 27 Down

5 Category 5 hurricane that struck US Gulf Coast in August 2005 (7)

9 Fibrous protein found in claws (7)

10 One of 118, perhaps I, O or U (7)

11 Yellowish form of iron oxide (8)

12 Equiangular polygon (6)

14 Type of long-focus lens (9)

17 Cat-like Madagascan carnivore (5)

18 Wolfgang ___ (1900–58), Austrian physicist (5)

20 Obsolete term for chronic obstructive pulmonary disease (9)

23 Simple sugar, C₅H₁₀O₅ (6)

24 Lynn ___ (1938–2011), proponent of symbiosis in evolution (8)

28 US space probe that arrived at Jupiter on 7 December 1995 (7)

29 Connective component of the nervous system (7)

30 Translate into code (7)

31 The S in Ludwig von Bertalanffy’s GST (7)

DOWN

1 Subject of study in a Rorschach test (7)

2 Term for a connective cell in, for instance, the endometrium, prostate or ovary (7)

3 Microfilament-forming protein found in most eukaryotic cells (5)

4 Edzard ___ (b. 1948), specialist in complementary medicine (5)

5 Central beam of the hull of a boat; part of the breastbone of a bird (4)

6 Tropical insect that spreads human sleeping sickness and animal trypanosomiasis (6, 3)

7 Extended stretches of low temperature, also known as glacial periods (3, 4)

8 Component of a radio (or an arthropod) (7)

13 In computing, a sequence of instructions that may be carried out several times in succession (4)

15 Joseph ___ (1733–1804), scientist credited with the discovery of “dephlogisticated air” (9)

16 Components of binary numbers, along with zeros (4)

18 Point of least distance between Earth and an orbiting object (7)

19 In geometry, a point on a surface that is locally spherical (7)

21 Concealment of (for example) the sun by the moon (7)

22 Collection of pus within the body, usually caused by infection (7)

25 Extreme point in object’s orbit (5)

26 Class, order, family, ___, species (5)

27 1A Sci-fi adventure series first broadcast in 1965 (4, 2, 5)